SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934

                                  NESTOR, INC.
                                (Name of Issuer)

                          Common Stock, $0.01 par value
                         (Title of Class of Securities)

                                    64107410
                                 (CUSIP Number)

                                 David P. Stokes
                      Transaction Systems Architects, Inc.
                             224 South 108th Avenue
                              Omaha, Nebraska 68154
                                 (402) 334-5101
            (Name, Address and Telephone Number of Person Authorized
                     to receive Notices and Communications)

                                    Copy to:

                                Neal A. Klegerman
                                Baker & McKenzie
                              One Prudential Plaza
                             130 East Randolph Drive
                             Chicago, Illinois 60601
                                 (312) 861-8000

                                 April 28, 1998
            (Dates of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule  because of  $240.13d-1(e),  240.13d-1(f)  or  240.13d-1(g)  check the
following box [ ].

Note:  Schedules  filed in paper format shall include a signed original and five
copies of the  Schedule,  including all exhibits.  See  $240.13d-7(b)  for other
parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

CUSIP No. 64107 410

                                       13D


1. Name of reporting person S.S. or I.R.S. Identification No. of above person

   Transaction Systems Architects, Inc., I.R.S. Identification No.: 47-0772104

2. Check the appropriate box if a member of a group    (a)
                                                       (b)   

3. SEC Use Only

4. Sources of Funds

       WC

5. Check if disclosure of legal proceedings is required pursuant to Items 2(d) 
   or 2(e)
                                                                               
6. Citizenship or place of organization Delaware


Number of Shares Beneficially                                               
Owned by Each Reporting           7.         Sole Voting Power
Person with:                                 5,000,000 
                                
                                  8.         Shared Voting Power
                                             0
                                                          
                                  9.         Sole Dispositive Power
                                             5,000,000
                                                                
                                  10.        Shared Dispositive Power
                                             0

                                                        
11.  Aggregate  amount  beneficially  owned by each reporting  person  5,000,000
     shares of Common Stock
                                                   
12.  Check box if the aggregate amount in row (11) excludes certain shares   x

                                              
13.  Percent of class represented by amount in row (11)
          26.7%
                                                        
14.  Type of reporting person
          HC, CO
                                                       

Item 1.  Security and Issuer

     The class of equity securities to which this statement relates is shares of
common stock,  par value $.01 per share (the "Common Stock") of Nestor,  Inc., a
Delaware corporation (the "Company"). The principal executive offices of the
Company are located at One Richmond Square, Providence, Rhode Island 02906.

Item 2. Identity and Background.

     (a)-(c),  (f) This  statement is filed by Transaction  Systems  Architects,
Inc., a Delaware corporation ("TSA"). TSA develops, markets and supports a broad
line of  software  products  and  services  primarily  focused  on  facilitating
electronic  payments.  The principal executive offices of TSA are located at 224
South 108th Avenue, Omaha, Nebraska 68154.

     The name,  business address and present principal  occupation or employment
of each director and executive officer of TSA and the name,  principal  business
and address of any corporation or other organization in which such employment is
conducted is set forth below. Each such person is a citizen of the United States
of America,  except for Don McLarty who is a citizen of Canada. Unless otherwise
indicated  below,  the  business  address of each such person is 224 South 108th
Avenue, Omaha, Nebraska 68154.

     William E. Fisher is a director and President and Chief  Executive  Officer
of  TSA  and  Chief  Executive  Officer  of  Applied  Communications,   Inc.,  a
wholly-owned subsidiary of the Company ("ACI")

     David C.  Russell  is a  director  and  Senior  Vice  President  of TSA and
President of ACI.

     Promod Haque, a director of TSA, is Vice  President and General  Partner of
Norwest  Venture  Capital,  Inc.  The  business  address of Mr. Haque is Norwest
Venture Capital, Inc., 245 Lytton Avenue, Suite 250, Palo Alto, CA 94301.

     Charles E. Noell,  III, a director of TSA, is the  Managing  Partner of JMI
Equity Fund, L.P., a private  investment fund. The business address of Mr. Noell
is JMI Equity  Fund,  L.P.,  12680 High Bluff Drive,  Number 200, San Diego,  CA
92130-2002.

     Jim D. Kever,  a director  of TSA,  is  President  and  Co-Chief  Executive
Officer of Envoy Corporation.  Envoy provides  electronic  processing  services,
primarily to the healthcare industry. The business address of Mr. Kever is Envoy
Corporation,  Two Lakeview Place, 15 Century Boulevard, Suite 600, Nashville, NC
37214.

     Larry G. Fendley,  a director of TSA, is Executive Vice President,  Product
Delivery   Services  for  CSG  Systems,   Inc.,  a  subsidiary  of  CSG  Systems
International,  Inc. CSG Systems provides customer  management  solutions to the
communications  industry.  The business  address of Mr.  Fendley is CSG Systems,
Inc., 2525 North 117th Avenue, Omaha, NE 68164.

     David P. Stokes is General Counsel of TSA.

     Gregory J. Duman is Chief Financial Officer and Treasurer of TSA.

     Edward H. Mangold is Senior Vice President- Americas Region of TSA.

     Thomas H. Boje is Vice  President-EMEA  Region of TSA. The business address
of Mr. Boje is 59 Clarendon Road, Watford, Herts WD1 1LA, England.

     Don McLarty is Vice  President-Asia/Pacific  Region of TSA.  Mr.  McLarty's
business address is 182 Clemenceau Avenue, #04-00, Singapore 239923.

     Fred L.  Grabher is Vice  President-Crystal  Clear of TSA and  President of
Crystal  Clear  Technology,  a  wholly-owned  subsidiary  of TSA. Mr.  Grabher's
business address is 212 South 108th Avenue, Omaha, NE 68154.

     Mark  R.  Vipond  is  Vice  President-USSI  of TSA  and  President  of U.S.
Software,  Inc., a wholly-owned subsidiary of TSA. Mr. Vipond's business address
is 2200 Abbott Drive, Carter Lake, IA 51510.

     Stephen  J.  Royer  is Vice  President-Grapevine  of TSA and  President  of
Grapevine, a wholly-owned subsidiary of TSA. Mr. Royer's business address is 218
South 108th Avenue, Omaha, NE 68154.

     Jeffrey S. Hale is Vice President-Product Company of TSA.

     Dwight G. Hanson is a Vice President of TSA.

     (d) and (e)  Neither  TSA nor, to the  knowledge  of TSA,  any of the other
persons  specified  in Item 2 above  has  during  the last  five  years (i) been
convicted in a criminal  proceeding  (excluding  traffic  violations  or similar
misdemeanors)  or (ii)  been a party  to a civil  proceeding  of a  judicial  or
administrative body of competent jurisdiction and as a result of such proceeding
was or is  subject  to a  judgment,  decree  or  final  order  enjoining  future
violations  of, or prohibiting  or mandating  activities  subject to, federal or
state securities laws or finding any violation with respect to such laws.

Item 3.  Source and Amount of Funds or Other Consideration.

     Pursuant  to a  Securities  Purchase  Agreement  dated as of April 28, 1998
between the  Company and TSA (the  "Securities  Purchase  Agreement"),  which is
attached hereto as Exhibit 1 and incorporated herein by reference,  TSA acquired
(i)  2,500,000  shares of Common Stock of the Company (the  "Shares") and (ii) a
Warrant to purchase up to  2,500,000  additional  shares of Common  Stock of the
Company at an  exercise  price of $3.00 per share,  a copy of which is  attached
hereto as Exhibit 2 and incorporated  herein by reference (the  "Warrant").  The
aggregate  purchase price for the Shares and Warrant was $5,000,000,  $4,500,000
of which was paid in cash and the  balance  of  $500,000  was paid  through  the
forgiveness by TSA of the outstanding  principal under a Loan Agreement  between
TSA and the  Company  dated March 25, 1998  further  described  in Item 6 below,
which is attached hereto as Exhibit 3 and incorporated  herein by reference (the
"Loan Agreement"). The Warrant is presently exercisable.

     The purchase of the Shares and Warrant was  consummated  on April 28, 1998.
TSA used working  capital for the purchase of the Shares and Warrant.  As of the
date hereof, it is expected that if and when TSA elects to exercise the Warrant,
the source of the necessary funds would be working capital.

     ACI and the Company were parties to a Prism Non-Exclusive License Agreement
dated  September  19,  1996 as amended  April 19,  1997 and  January  14,  1998.
Concurrently  and in  connection  with  entering  into the  Securities  Purchase
Agreement,  ACI and the Company  entered  into an Amended and  Restated  License
Agreement,  which is  attached  hereto as Exhibit 4 and  incorporated  herein by
reference (the "License Agreement"),  providing for distribution,  licensing and
support of Nestor's suite of fraud detection software products.

     Three executive  officers of TSA beneficially own shares of Common Stock of
the Company.  Edward H. Mangold has purchased  using personal funds an aggregate
of 20,000  shares of Common Stock for an  aggregate  purchase  price,  excluding
brokerage commissions,  of $43,621 in open market transactions through a broker.
Stephen J. Royer has  purchased  using  personal  funds an  aggregate  of 10,000
shares of Common  Stock for an aggregate  purchase  price,  excluding  brokerage
commissions, of $19,187.50 in open market transactions through a broker. Gregory
J. Duman has  purchased  using  personal  funds an  aggregate of 1,000 shares of
Common Stock for an aggregate purchase price,  excluding brokerage  commissions,
of $1,312 in open market transactions through a broker.

Item 4.  Purpose of Transaction.

     TSA  purchased  the  Shares  and  the  Warrant  for   investment   purposes
concurrently  and in connection  with entering into the License  Agreement.  TSA
will continue to evaluate its  investment in the Company on the basis of various
factors,  including  the Company's  business,  financial  condition,  results of
operations  and  prospects,   general  economic  and  industry  conditions,  the
securities  markets  in  general  and  those  for the  Company's  securities  in
particular,  TSA's own financial condition,  other investment  opportunities and
other  future  developments.  Based  upon  such  evaluation,  TSA will take such
actions in the future as TSA may deem appropriate in light of the  circumstances
existing  from time to time.  Depending  on market  and other  factors,  TSA may
exercise the Warrant,  seek to acquire  additional shares of Common Stock of the
Company in the open market or in private  transactions,  determine to dispose of
all or a portion  of the  Shares or the shares of Common  Stock  underlying  the
Warrant  or to enter  into  option  or other  transactions  (including,  without
limitation,  hedging transactions) with third parties with respect to the Common
Stock of the Company.

     Concurrently  and in connection with entering into the Securities  Purchase
Agreement,  the Company and TSA entered into a  Registration  Rights  Agreement,
which is attached hereto as Exhibit 5 and incorporated  herein by reference (the
"Registration  Rights  Agreement").  Subject  to the  terms of the  Registration
Rights  Agreement,  TSA may dispose of the Shares or the shares  underlying  the
Warrant.

     The three executive officers of TSA that hold shares of Common Stock of the
Company  (each,  an  "Individual  Holder")  purchased such shares for investment
purposes. Each Individual Holder will continue to evaluate his investment in the
Company on the basis of  various  factors,  including  the  Company's  business,
financial condition,  results of operations and prospects,  general economic and
industry  conditions,  the  securities  markets  in  general  and  those for the
Company's  securities in particular,  the financial condition of such Individual
Holder, other investment opportunities and other future developments. Based upon
such evaluation,  each Individual Holder will take such actions in the future as
he may deem  appropriate  in light of the  circumstances  existing  from time to
time. Depending on market and other factors,  each Individual Holder may seek to
acquire  additional  shares of Common  Stock of the Company in the open  market,
determine  to dispose  of all or a portion  of his shares of Common  Stock or to
enter into option or other transactions (including,  without limitation, hedging
transactions)  with  third  parties  with  respect  to the  Common  Stock of the
Company.

     Neither TSA nor, to the knowledge of TSA, any executive officer or director
of TSA, has any plans or proposals with respect to any of the actions  specified
in clauses (a) through  (j) of Item 4 of  Schedule  13D,  except as set forth in
this Item 4 and Item 6 below.

Item 5. Interest in Securities of the Issuer.

     (a) As of the date hereof, TSA beneficially owns 5,000,000 shares of Common
Stock of the Company  including  2,500,000  shares which may be purchased by TSA
upon exercise of the Warrant which is currently  exercisable.  Assuming exercise
of the Warrant in full, such 5,000,000 shares represent  approximately  26.7% of
the outstanding  shares of Common Stock of the Company  (calculated on the basis
of  16,253,270  shares of Common Stock  outstanding  immediately  following  the
consummation  of TSA's  purchase  of the Shares and  Warrant,  as  specified  in
Section  3(c)  of the  Securities  Purchase  Agreement,  plus  2,500,000  shares
issuable  upon  exercise of the  Warrant).  To the knowledge of TSA, none of the
executive  officers and directors of TSA  beneficially  own any shares of Common
Stock  of  the  Company,  except  for  Messrs.  Mangold,  Royer  and  Duman  who
beneficially own 20,000, 10,000 and 1,000 shares of Common Stock,  respectively.
Assuming  exercise of the Warrant in full,  the number of shares held by Messrs.
Mangold,  Royer and Duman represent in the aggregate  approximately  0.2% of the
outstanding shares of Common Stock of the Company  (calculated on the same basis
as the  percentage  held by TSA as described  above).  TSA disclaims  beneficial
ownership of the shares held by Messrs. Mangold, Royer and Duman.

     (b) TSA has the sole power to vote or to direct the vote, and to dispose or
to direct the  disposition  of,  all of the Shares  and,  upon  exercise  of the
Warrant, the shares of Common Stock issuable to TSA upon exercise thereof.  Each
of Mr. Mangold,  Mr. Royer and Mr. Duman has the sole power to vote or to direct
the vote, and to dispose or to direct the  disposition  of, the shares of Common
Stock beneficially owned by him.

     (c) Except as set forth herein,  TSA has not effected any  transactions  in
the Common Stock during the past 60 days.  To the knowledge of TSA, no executive
officer or director of TSA has  effected  any  transactions  in the Common Stock
during the past 60 days.

     (d) Not applicable.

     (e) Not applicable.

Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to
Securities of the Issuer.

TSA agreed to lend the Company up to $1,500,000  under the terms and  conditions
of  the  Loan  Agreement,   of  which  $500,000  of  principal  was  outstanding
immediately  prior to the  consummation  of the  purchase  of the Shares and the
Warrant by TSA. TSA forgave the  outstanding  principal in  connection  with its
purchase  of the  Shares  and the  Warrant  as  described  in Item 2 above  and,
pursuant to the terms of the Securities  Purchase  Agreement,  any obligation of
TSA to make any loans under the Loan  Agreement  terminated  upon closing of the
sale of the Shares and the Warrant to TSA.

Pursuant to the terms of the Securities Purchase  Agreement,  for so long as TSA
or any of its  wholly-owned  subsidiaries  shall  own  and/or  have the right to
acquire  from  the  Company  at  least  2,500,000  million  shares  (subject  to
adjustment  for stock splits,  stock  dividends,  subdivisions,  etc.) of Common
Stock in the  aggregate,  TSA is  entitled to propose  one  candidate  (the "TSA
Designee")  for election to the Board of  Directors of the Company.  The Company
agreed,  subject to its fiduciary  duties to  stockholders,  to recommend to its
stockholders  that  the TSA  Designee  be  elected  to the  Company's  Board  of
Directors.

Under the terms of the Securities Purchase Agreement,  the Company agreed to, as
soon as  practicable,  but in no event  more than 30 days after the bid price of
the Common  Stock  closes at the  minimum  amount for any  minimum  time  period
required by The Nasdaq SmallCap Market initial  listing  requirements,  complete
and file a listing  application  for the Common Stock together with all required
documents  and to use its best efforts to cause the Common Stock  including  the
Shares and the shares  issuable upon exercise of the Warrant to be listed and to
continue to be listed on The Nasdaq SmallCap Market.

To satisfy a condition to the  obligation  of TSA to purchase the Shares and the
Warrant  pursuant to the  Securities  Purchase  Agreement,  Wand  (Nestor)  Inc.
converted  all shares of Series E,  Series F,  Series G and  Series H  Preferred
Stock of the  Company,  including  all accrued  dividends  thereon,  into Common
Stock. Under the Securities  Purchase  Agreement,  the Company agreed to use its
best efforts to take, or cause to be taken, all reasonable  actions,  and to do,
and cause to be done, all things reasonably  necessary for the conversion of the
shares of Series B and Series D  Preferred  Stock of the Company  including  all
accrued dividends  thereon into Common Stock at the applicable  conversion rates
provided in the respective terms of such series as soon as practicable.

     Pursuant to the Registration Rights Agreement, after March 31, 1999 TSA has
the  right to  require  the  Company  to  register  the  Shares  and the  shares
underlying the Warrant.

     Except as described in this  Statement,  to the knowledge of TSA, there are
no contracts, arrangements, understandings or relationships (legal or otherwise)
among the persons  named in Item 2 hereof and between such persons and any other
person with respect to any securities of the Company, including, but not limited
to, transfer or voting of any of such securities, finder's fees, joint ventures,
loan or option arrangements,  puts or calls, guarantees of profits,  division of
profits or loss, or the giving or withholding of proxies.

     The  information set forth herein is qualified in its entirety by reference
to the Securities Purchase Agreement, Warrant, Loan Agreement, License Agreement
and  Registration  Rights  Agreement,  each of which is  incorporated  herein by
reference.

Item 7. Material to be Filed as Exhibits.

     (1) Securities Purchase Agreement between the Company and TSA
     (2) Common Stock Purchase Warrant
     (3) Loan Agreement between TSA and the Company
     (4) Amended and Restated License Agreement between ACI and the Company
     (5) Registration Rights Agreement between the Company and TSA



                                    Signature

     After  reasonable  inquiry and to the best of my  knowledge  and belief,  I
certify that the information  set forth in this Amendment is true,  complete and
correct.

Date:  May 8, 1998



                                         TRANSACTION SYSTEMS ARCHITECTS, INC.

                                    By: /s/ Dwight G. Hanson
                                        --------------------------------------
                                    Name:  Dwight G. Hanson
                                         -------------------------------------
                                  Title:   Vice President
                                         -------------------------------------



                                INDEX TO EXHIBITS


Exhibit
Number 


(1)       Securities Purchase Agreement between the Company and TSA

(2)       Common Stock Purchase Warrant

(3)       Loan Agreement between TSA and the Company

(4)       Amended and Restated License Agreement between ACI and the Company

(5)       Registration Rights Agreement between the Company and TSA



                          SECURITIES PURCHASE AGREEMENT

     THIS SECURITIES  PURCHASE AGREEMENT  ("Agreement") is made as of the day of
April  28,  1998 by and  between  Nestor,  Inc.,  a  Delaware  corporation  (the
"Company") and Transaction Systems Architects, Inc., a Delaware corporation (the
"Purchaser").

                                    RECITALS

     A. The Purchaser and the Company  entered into a Loan Agreement dated March
25, 1998 (the "Loan  Agreement")  pursuant to which the Purchaser agreed to lend
the Company up to $1,500,000  subject to the terms and  conditions  thereof,  of
which $500,000 of principal is outstanding as of the date hereof as evidenced by
a Note (the "Note").



     B. Applied Communications, Inc., a wholly-owned subsidiary of the Purchaser
("ACI"), and the Company are parties to a Prism Non-Exclusive  License Agreement
dated  September  19,  1996 as amended  April 19,  1997 and  January  14,  1998.
Concurrently  herewith,  ACI and the  Company are  entering  into an Amended and
Restated License Agreement (the "License Agreement") in the form of Exhibit I.

     C. The Company desires to sell to the Purchaser,  and the Purchaser desires
to  purchase  from the  Company,  (1)  2,500,000  shares of Common  Stock of the
Company,  par value $.01 per share (the  "Common  Stock"),  and (2) a Warrant to
purchase up to an aggregate of 2,500,000  shares of Common Stock in the form set
forth as Exhibit II (the "Warrant").

     D.  Concurrently  herewith the Company and the  Purchaser are entering into
the  Registration  Rights  Agreement  in the form set forth as Exhibit  III (the
"Registration Rights Agreement").

     E.  Concurrently  with the consummation of this Agreement,  the Company and
certain stockholders of the Company will enter into the amendments (the "Revised
Agreements") set forth as Exhibit IV hereto to certain  existing  agreements and
securities  of the Company for the purpose of  conforming  such  agreements  and
securities to the terms of this Agreement.

     NOW, THEREFORE,  in consideration of the mutual covenants contained herein,
and of other good and valuable  consideration,  the receipt and  sufficiency  of
which are hereby acknowledged,  the parties hereto, each intending to be legally
bound, do hereby agree as follows:




1. SALE AND PURCHASE OF COMPANY SECURITIES; OTHER TRANSACTIONS.


     The Company has  authorized  the issuance and sale to the Purchaser of, (i)
2,500,000 shares of Common Stock ("the Shares") and (ii) the Warrant. Subject to
the terms and  conditions  herein set forth,  the Company will issue and sell to
the Purchaser,  and the Purchaser will purchase from the Company, at the Closing
(as defined below) the Shares and the Warrant.  The aggregate purchase price for
the Shares and Warrant shall be $5,000,000  (the  "Purchase  Price")  payable as
follows: (i) $4,500,000 in cash and (ii) surrender of the Note.

2. CLOSING.

     (a) Subject to the  applicable  provisions  of Sections 7, 8, and 9 hereof,
the closing of the sale of the Shares and the Warrant (the "Closing") shall take
place  at a  mutually  agreed  location  as soon as  practicable  following  the
satisfaction  or waiver of the applicable  conditions set forth in Sections 7, 8
and 9 hereof.

     (b)  At the  Closing,  (i)  the  Company  shall  deliver  to the  Purchaser
certificates  evidencing  the Shares  and the  Warrant  to be  purchased  by the
Purchaser,  (ii) the  Company  shall  pay to the  Purchaser  the  amount  of all
interest on the Note accrued  through the Closing in the form of a check or wire
transfer  of  immediately  available  funds  to an  account  designated  by  the
Purchaser (iii) the Purchaser shall deliver to the Company the Purchase Price in
the  form  of  wire  transfer  of  immediately  available  funds  to an  account
designated  by the Company in the amount of  $4,500,000  and the delivery of the
Note marked as cancelled, and (iii) the parties shall make such other deliveries
as are contemplated hereby.


3. REPRESENTATIONS AND WARRANTIES OF THE COMPANY.

     The Company hereby represents and warrants to the Purchaser as follows:

     (a)  Organization,  Standing  and Power of the  Company.  The  Company is a
corporation duly  incorporated,  validly existing and in good standing under the
laws of the State of Delaware. The Company has all requisite power and authority
to own, lease and operate its properties, assets and business and to conduct its
business  as now being  conducted  and is duly  qualified  to do  business  as a
foreign  corporation  in good  standing in those  jurisdictions,  other than the
state of its  incorporation,  in which the nature of the  business  conducted or
property owned by it makes such qualification necessary, except for any failures
so to qualify which would not have, individually or in the aggregate, a material
adverse  effect on the  business,  condition  or  results of  operations  of the
Company (a "Company Material Adverse Effect").

     (b) Authority;  Enforceability;  No Conflict. The Company has all requisite
corporate  power and authority to enter into this  Agreement,  the  Registration
Rights Agreement,  the Warrant and the Revised Agreements (such agreements other
than this  Agreement  are  collectively  referred to  hereafter  as the "Related
Agreements") to issue and sell the Shares and the Warrant,  and to carry out its
obligations hereunder and under the Related Agreements. The execution,  delivery
and performance of this Agreement and the Related  Agreements by the Company and
the  issuance  and sale of the Shares and the Warrant by the  Company  have been
duly and validly authorized by all requisite  corporate  proceedings on the part
of the Company.  This Agreement is, and the Related Agreements when executed and
delivered  by the Company will be, and when issued and sold the Warrant will be,
a valid  and  binding  obligation  of the  Company,  enforceable  against  it in
accordance  with its terms,  except that (i) such  enforcement may be subject to
bankruptcy, insolvency, reorganization, moratorium, rehabilitation, liquidation,
conservatorship,  receivership  or other similar laws now or hereafter in effect
relating  to  creditors'  rights  generally  and (ii)  the  remedy  of  specific
performance and injunctive and other forms of equitable relief may be subject to
equitable  defenses  and to  the  discretion  of  the  court  before  which  any
proceeding  therefor  may be brought.  Subject to the receipt of the consents or
approvals set forth in Section 3(b) of the disclosure  schedule delivered by the
Company to the Purchasers  concurrently  with the execution and delivery of this
Agreement  (the  "Disclosure  Schedule"),  the  execution  and  delivery of this
Agreement and each Related Agreement by the Company do not, and the consummation
by the Company of the transactions contemplated hereby and thereby will not, the
issuance and sale of the Shares and the Warrant will not, and the performance by
the  Company of its  obligations  under the terms of the Shares and the  Warrant
will not,  result in or  constitute:  (i) a default,  breach or  violation of or
under the Certificate of Incorporation or the By-laws of the Company,  or (ii) a
default, breach or violation of or under any mortgage, deed of trust, indenture,
note, bond, license,  lease agreement or other instrument or obligation to which
the Company is a party or by which any of their  properties or assets are bound,
except  for  any  defaults,   breaches  or  violations  which  would  not  have,
individually or in the aggregate,  a Company Material Adverse Effect, or (iii) a
violation of any statute,  rule,  regulation,  order,  judgment or decree of any
court, public body or authority by which the Company or any of its properties or
assets are bound,  except for any violations which would not have,  individually
or in the aggregate,  a Company Material Adverse Effect,  or (iv) an event which
(with  notice or lapse of time or both)  would  permit any person to  terminate,
accelerate  the  performance  required  by, or  accelerate  the maturity of, any
indebtedness  or  obligation of the Company under any agreement or commitment to
which the Company is a party or by which the Company is bound or by which any of
its properties or assets are bound, except for any accelerations or terminations
which  would not have,  individually  or in the  aggregate,  a Company  Material
Adverse  Effect,  or (v) the  creation  or  imposition  of any  lien,  charge or
encumbrance  on any property of the Company under any agreement or commitment to
which the Company is a party or by which the Company is bound or by which any of
its respective  properties or assets are bound, except for any liens, charges or
encumbrances which would not have,  individually or in the aggregate,  a Company
Material Adverse Effect,  or (vi) an event which would require any consent under
any  agreement  to which the Company is a party or by which the Company is bound
or by which any of its respective properties or assets are bound, except for any
consents  which,  if  not  received,  would  not  have,  individually  or in the
aggregate, a Company Material Adverse Effect.

     (c) Capitalization. The authorized capital stock of the Company consists of
(i)  30,000,000  shares of Common  Stock,  par value  $.01 per  share,  of which
9,486,273 shares  (excluding  shares held in treasury) are outstanding as of the
close of business on April 16, 1998 and  10,000,000  shares of preferred  stock,
par value $1.00 per share (the "Preferred  Stock"), of which 1,363,250 shares of
Series B,  170,171  shares of Series D, 1,444  shares of Series E, 599 shares of
Series F, 777 share of Series G, and 2,026  shares of Series H  Preferred  Stock
are  outstanding  as of the  close of  business  on April 16,  1998.  All of the
outstanding shares of Common Stock and Preferred Stock have been duly authorized
and validly issued, and are fully paid and non-assessable. Immediately following
the Closing, 16,253,270 shares of Common Stock will be outstanding and no shares
of Preferred Stock will be outstanding  except for 1,363,250  shares of Series B
and  170,171  shares of Series D  Preferred  Stock.  Except for the  outstanding
shares of Series B and  Series D  Preferred  Stock,  and  except as set forth in
Section 3(c) of the Disclosure  Schedule,  there are no outstanding  preemptive,
conversion or other rights, options, warrants or agreements granted or issued by
or binding  upon the Company for the  purchase or  acquisition  of any shares of
capital  stock  of  the  Company  or  any  other  securities  convertible  into,
exchangeable  for or  evidencing  the right to subscribe  for any shares of such
capital  stock.  The Company is not  subject to any  obligation  (contingent  or
otherwise)  to  repurchase  or  otherwise  acquire  or retire  any shares of the
capital stock of the Company or any convertible securities, rights or options of
the type described in the preceding sentence. The Company is not a party to, and
does not have knowledge of, any agreement expressly  restricting the transfer of
any shares of the  capital  stock of the  Company.  Upon the  Closing and giving
effect to the  transactions  contemplated  hereby  and the  satisfaction  of the
conditions   provided  for  herein,  the  Shares  will  constitute  11%  of  the
outstanding  Common Stock on a fully  diluted  basis and 14% of the total voting
power of the Company,  and the Shares  together  with the shares of Common Stock
issuable upon exercise of the Warrant will constitute  19.9% of the Common Stock
on a fully diluted basis and 24.6% of the total voting power of the Company.

     (d) No  Subsidiaries  or Other  Ventures.  Except as set  forth in  Section
3(d)(i) of the Disclosure Schedule,  the Company has no subsidiaries.  Except as
set forth in Section  3(d)(i) of the Disclosure  Schedule,  the Company does not
own, directly or indirectly, any interest in any corporation, partnership, joint
venture, association or other entity.

     (e) Status of Shares. The Shares to be issued at the Closing have been duly
authorized by all necessary  corporate  action on the part of the Company.  When
issued and paid for as  provided in this  Agreement,  the Shares will be validly
issued and outstanding,  fully paid and  nonassessable,  and the issuance of the
Shares  is not and  will  not be  subject  to  preemptive  rights  of any  other
stockholder  of the  Company.  The  shares  of Common  Stock to be  issued  upon
exercise of the Warrant have been duly  authorized  by all  necessary  corporate
action on the part of the Company and, as of the Closing,  will be duly reserved
for  issuance.  When the shares of Common Stock are issued upon  exercise of the
Warrant,  such shares  will be validly  issued and  outstanding,  fully paid and
nonassessable  and the issuance of such shares will not be subject to preemptive
rights of any other stockholder of the Company.

     (f) Financial Statements.

          (1) The Company has  heretofore  delivered  or made  available  to the
     Purchaser the audited  consolidated balance sheets at December 31, 1997 and
     1996,  and  June  30,  1996 of the  Company  and the  related  consolidated
     statements  of  income,  stockholders'  equity and cash flows for the years
     then ended,  including the related notes and auditor's  report thereon (the
     "Financial  Statements").  The Financial  Statements (i) present fairly the
     consolidated  financial  condition of the Company at the dates  thereof and
     present  fairly its  consolidated  results of operations and cash flows for
     the  periods  then ended and (ii) have been  prepared  in  conformity  with
     generally accepted accounting principles ("GAAP") applied consistently with
     respect to the immediately  preceding  fiscal period except as set forth in
     the notes to the Financial Statements or in the auditor's report thereon.

          (2) The Company has  heretofore  delivered  or made  available  to the
     Purchaser the unaudited  consolidated balance sheet at February 28, 1998 of
     the Company (the  "February  Balance  Sheet") and the related  consolidated
     statements  of income and cash flows for the two  months  then ended  (such
     February Balance Sheet and related consolidated  statements,  collectively,
     the "February Financial Statements"), each of which (i) presents fairly, in
     all material respects,  the consolidated financial condition of the Company
     at February  28,  1998,  and presents  fairly its  consolidated  results of
     operations  and cash flows for the two months  then ended and (ii) has been
     prepared  in  compliance  with all of the  requirements  of the  Securities
     Exchange Act of 1934, as amended,  (the "Exchange  Act") and the applicable
     rules and regulations thereunder.

     (g) SEC Reports. The Company has filed all reports,  statements,  forms and
documents with the Securities  Exchange  Commission ("SEC") that it was required
to file since December 31, 1990 (the "SEC Reports"),  all of which have complied
in all material respects with all applicable  requirements of the Securities Act
of 1933, as amended (the  "Securities  Act"),  and the Exchange Act. As of their
respective  dates,  each such report,  statement,  form or  document,  including
without limitation any financial  statements or schedules included therein,  did
not contain any untrue  statement of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements  therein,
in light of the circumstances under which they were made, not misleading.

     (h)  Liabilities.  As of the date  hereof,  except  (i) as set forth on the
February  Balance  Sheet,  (ii) as set forth in Section  3(h) of the  Disclosure
Schedule or (iii) for  liabilities  or  obligations  which were  incurred  after
February 28, 1998 in the ordinary  course of business and  consistent  with past
practices,  the  Company  has no  liabilities,  obligations,  claims  or  losses
(whether liquidated or unliquidated,  secured or unsecured,  absolute,  accrued,
contingent  or  otherwise)   that  would  be  required  to  be  disclosed  on  a
consolidated  balance  sheet of the  Company  (including  the notes  thereto) in
conformity with GAAP.

     (i)  Indebtedness of the Company.  Section 3(i) of the Disclosure  Schedule
sets forth all  outstanding  secured  and  unsecured  Indebtedness  (as  defined
hereinafter) of the Company in excess of $50,000 in any individual  case, or for
which the Company has commitments, on the date of this Agreement. The Company is
not in default with respect to any such  Indebtedness.  "Indebtedness"  means at
any  time,  (i) all  indebtedness  for  borrowed  money,  (ii)  all  obligations
evidenced by bonds,  debentures,  notes or other similar instruments,  (iii) all
reimbursement  obligations and other liabilities  under letters of credit,  (iv)
all  obligations  to pay the  deferred  purchase  price of property or services,
other than normal trade creditors in the ordinary course, (v) all obligations in
respect of capitalized leases,  (vi) all guarantees and contractual  obligations
of the Company,  contingent or otherwise,  with respect to any  indebtedness  or
obligation of another,  and (vii) all  obligations of the Company secured by any
mortgage,  pledge,  lien, security interest or other encumbrance on any asset or
property of the Company, whether or not such obligation has been assumed.

     (j) Title to Properties; Liens. The Company does not own any real property.
Section 3(j) of the Disclosure  Schedule  correctly  describes all real property
leased  by the  Company,  together  with a  description  of  the  lease  payment
obligations  and lease  termination  provisions  relating  thereto.  The Company
enjoys peaceful and  undisturbed  possession  under all leases  necessary in any
material  respect for the operation of its properties  and assets,  and all such
leases are valid and subsisting and are in full force and effect.

     (k) Actions  Pending.  There is no action,  suit,  claim,  investigation or
proceeding pending or, to the knowledge of the Company, threatened,  against the
Company which questions the validity of this Agreement or the Related Agreements
or any  action  taken or to be taken  pursuant  hereto  or  thereto.  Except  as
disclosed in Section 3(k) of the Disclosure Schedule,  there is no action, suit,
claim,  investigation or proceeding pending or, to the knowledge of the Company,
threatened, against or involving the Company or any of its properties or assets.
There are no outstanding orders,  judgments,  injunctions,  awards or decrees of
any court, arbitrator or governmental or regulatory body against the Company.

     (l)  Compliance  with Law.  The  business  of the  Company  has been and is
presently  being conducted so as to comply with all applicable  federal,  state,
and local governmental laws, rules, regulations and ordinances.  The Company has
all material franchises,  permits, licenses,  consents and other governmental or
regulatory  authorizations  and  approvals  necessary  for  the  conduct  of its
business  as now  being  conducted  by it,  and  the  Company  is in  compliance
therewith except for any non-compliances which would not, individually or in the
aggregate, have a Company Material Adverse Effect.

     (m) No  Violations.  Except as disclosed in Section 3(m) of the  Disclosure
Schedule,  the Company is not in violation  of or default  under (i) any term of
its  Certificate  of  Incorporation  or By-Laws,  (ii) any of its  contracts  or
agreements or under any  instrument by which the Company is bound,  or (iii) any
outstanding indenture or other debt instrument or with respect to the payment of
principal of or interest on any outstanding obligations for borrowed money.

     (n) Taxes.

          (i) The Company has duly and timely filed, or caused to be filed,  and
     will duly and timely file, or cause to file,  with the  appropriate  taxing
     authority  all Tax Returns (as  defined  below)  required to be filed on or
     before  the date  hereof by or with  respect  to the  Company  and such Tax
     Returns were or will be true, correct and complete in all material respects
     when filed.

          (ii) The  Company  has paid or  caused  to be paid in full or has made
     adequate  provision for on its balance sheet all material Taxes (as defined
     below)  shown to be due on such Tax  Returns.  There are no liens for Taxes
     upon the  assets of either  the  Company  except  for  statutory  Liens for
     current Taxes not yet due.

          (iii) None of the Tax Returns filed by or on behalf of the Company has
     been examined by the appropriate taxing authorities.

          (iv) Except as set forth in Schedule 3(n)(iv) hereto,  the Company has
     not  received  any  notice of  deficiency  or  assessment  from any  taxing
     authority with respect to liabilities or obligations for Taxes with respect
     to the Company  which has not been fully paid or finally  settled,  and any
     such  deficiency or assessment  shown in Schedule  3(n)(iv) hereto is being
     contested in good faith through  appropriate  proceedings.  The Company has
     not given any  outstanding  waivers or  comparable  consents  extending the
     application of the statute of limitations  with respect to any Taxes or Tax
     Returns with respect to the Company.

          (v) The  Company  has  complied  in all  material  respects  with  all
     applicable  laws,  rules  and  regulations  relating  to  the  payment  and
     withholding of payroll and employment  taxes and have,  within the time and
     in the manner prescribed by law, withheld from employee wages and paid over
     to the proper governmental  authorities all material payroll and employment
     taxes required to be so withheld and paid over.

          (vi) No audit or other  administrative  proceeding or court proceeding
     which is  material  to the  financial  condition  of Company  is  presently
     pending with regard to any Taxes or Tax Returns.

          (vii) The amount and  character of the tax loss  carryforwards  as set
     forth in the Company's financial statements for the year ended December 31,
     1997 are materially accurate and, to the Company's best knowledge,  are not
     subject to any "Section 382 limitation"  under Section 382 of the Code, and
     any regulations promulgated thereunder. To the Company's best knowledge, at
     the Closing Date,  the issuance of the Shares and the Warrant in accordance
     with the terms of this Agreement and the Related Agreements will not result
     in an "ownership change" under Section 382 of the Code, and any regulations
     promulgated thereunder.  As of the Closing Date, the Company shall not have
     any plan or intention to take any action after the Closing  Date,  which to
     its best knowledge would result in an "ownership  change" under Section 382
     of the Code and any regulations promulgated thereunder.

          (viii) For purposes of this Agreement,  "Taxes" shall mean any and all
     taxes,  charges,  fees,  levies or other like  assessments (and all related
     interest,  additions to tax and penalties),  including, but not limited to,
     income, transfer, gains, gross receipts, excise, inventory, property (real,
     personal or intangible),  custom,  duty, sales, use, license,  withholding,
     payroll,  employment,  capital  stock and franchise  taxes,  imposed by the
     United States,  or any state,  local or foreign taxing  authority,  whether
     computed on a unitary,  combined or any other basis and "Tax Return"  shall
     mean  any  report,  return  or other  information  filed  with  any  taxing
     authority  with  respect  to  Taxes  imposed  upon or  attributable  to the
     operations of the Company.

          (o) ERISA. Section 3(o) of the Disclosure Schedule contains a true and
     complete list of each employee  benefit plan, as defined in Section 3(3) of
     the Employee  Retirement Income Security Act of 1974, as amended ("ERISA"),
     and any other bonus,  severance or  termination  pay, stock option or stock
     purchase,  incentive  pay or other plan,  program or  arrangement  covering
     present  or  former  employees  of  the  Company  which  is  maintained  or
     contributed  to by the Company or any of its  subsidiaries  (the  "Plans").
     None of the Plans is subject to the  provisions  of Title IV of ERISA,  and
     none of the Plans is a  multiemployer  Plan as defined in Section  3(37) of
     ERISA (a "Multiemployer  Plan").  The Company has not incurred (directly or
     indirectly)  any liability to the Pension Benefit  Guaranty  Corporation or
     with respect to a  Multiemployer  Plan. None of the Plans is subject to the
     minimum funding  standards set forth in Section 302 of ERISA or Section 412
     of the Internal Revenue Code of 1986, as amended (the "Code").  None of the
     Company or any of its  officers or employees  has engaged in a  "prohibited
     transaction" as defined in Section 406 of ERISA or Section 4975 of the Code
     with respect to any Plan which would subject any of such parties to a civil
     penalty under  Section  502(i) of ERISA or an excise tax under Section 4975
     of the Code.  Each of the Plans has been operated in all material  respects
     in accordance with  applicable  law,  including ERISA and the Code. None of
     the Plans is an employee welfare plan, as defined in Section 3(1) of ERISA,
     which  provides  health or life  insurance  benefits  to  employees  of the
     Company  following  their  retirement  (other  than  coverage  mandated  by
     applicable  law).  Each Plan that is intended to be qualified under Section
     401(a) of the Code is so qualified.

          (p) Absence of Specified Changes.  Except as set forth in Section 3(p)
     of the Disclosure Schedule, during the period from February 28, 1998 to the
     date hereof, there has not been any:

               (1) material adverse change in the business, condition or results
          of operations of the Company;

               (2)  transactions  involving  the Company  except in the ordinary
          course of business;

               (3) change in accounting principles,  methods or practices of the
          Company;

               (4) amendment to the Certificate of  Incorporation  or By-Laws of
          the Company; or

               (5)  agreement  or  understanding  to  take  any of  the  actions
          described above in this paragraph.

          (q) Certain Fees. No broker's,  finder's or financial advisory fees or
     commissions will be payable by the Company with respect to the transactions
     contemplated by this Agreement and the Related Agreements.

          (r) Use of Proceeds. The Company will apply the proceeds from the sale
     of the Shares and the Warrant to general working capital purposes.

          (s) Intellectual Property Rights.

               (i) The  Company is the owner of or has rights to use  (including
          the right to sue for past  infringement)  the intellectual and similar
          property of every kind and nature used at any time in or necessary for
          the conduct of its business, including without limitation, (A) Patents
          (meaning   all  United   States  and   foreign   patents   and  patent
          applications,  patent  disclosures  and  inventions,  and all  patents
          issued upon said patent  applications  or based upon said  disclosures
          and  inventions,  including  all reissues,  divisions,  continuations,
          continuations-in-part, substitutions, extensions or renewals of any of
          the  foregoing),  (B)  Trademarks  (meaning  all  United  States,  any
          political subdivision thereof, and foreign trademarks,  service marks,
          trade  names,   corporate  names,   company  names,   business  names,
          fictitious  business names, trade styles,  logos,  designs and general
          intangibles of like nature, all registrations and recordings  thereof,
          and all applications in connection therewith, including registrations,
          recordings and  applications in the United States Patent and Trademark
          Office  (the  "PTO"),  any  State of the  United  States  or any other
          country or jurisdiction or any political  subdivision thereof, and all
          goodwill  symbolized  thereby  and/or  associated  therewith  and  all
          extensions  or  renewals   thereof,),   (C)  Copyrights  (meaning  all
          copyrights,  United States and foreign  copyright  registrations,  and
          applications  to  register  copyrights),  (D)  inventions,   formulae,
          processes,  designs, know-how,  show-how or other data or information,
          (E)  confidential or proprietary  technical and business  information,
          processes  and trade  secrets,  (F) computer  software  and  databases
          (including   all   embodiments   or  fixations   thereof  and  related
          documentation,   registrations  and  franchises,  and  all  additions,
          improvements,  enhancements,  updated and accessions thereto), (G) all
          technical  manuals and  documentation  made or used in connection with
          any of the foregoing,  and (H) all licenses and rights with respect to
          the  foregoing or property of like nature,  in each case as any of the
          foregoing  have been at any time used in or necessary  for the conduct
          of  the  business  of the  Company  (collectively,  the  "Intellectual
          Property Rights").

               (ii) Section  3(s)(ii) of the  Disclosure  Schedule  sets forth a
          complete and accurate list of all Copyrights,  Patents, and Trademarks
          owned by or under obligation of assignment to the Company.  Each owner
          identified  thereon is listed in the records of the appropriate United
          States, State or foreign agency as the sole owner of record.

               (iii) Section  3(s)(iii) of the Disclosure  Schedule sets forth a
          complete and accurate list of (a) all material  agreements and (b) all
          other  agreements  entered  into since  January 1, 1990,  in each case
          between the Company and any third party  granting  any right to use or
          practice   any   rights   under  any   Intellectual   Property   Right
          (collectively,  the  "Intellectual  Property  Licenses"),  except  for
          single-user  licenses  granting the right to use on a single  personal
          computer a single copy of application  software  incorporating  any of
          the Company's Intellectual Property Rights.

               (iv) There is no  restriction  or  limitation on the right of the
          Company to transfer any of the Intellectual Property Rights.

               (v)  No  trade  secret,  formula,  process,  invention,   design,
          know-how,  show-how or any other confidential  information relating to
          the  Company's  business  has  been  disclosed  or  authorized  to  be
          disclosed  to any third party  unless any such third party has entered
          into, or is bound by, a  confidentiality  agreement that is sufficient
          to protect fully the Company's  proprietary  interest and right in and
          to such Intellectual Property Right.

               (vi) The use of the  Intellectual  Property Rights by the Company
          is not in  conflict  with the rights of  others.  There are no pending
          legal   or   governmental    proceedings,    including    oppositions,
          interferences,  proceedings  or suits,  relating  to the  Intellectual
          Property  Rights,  and, to the best knowledge of the Company,  no such
          proceedings are threatened.  To the best knowledge of the Company, the
          conduct  of the  business  of the  Company  and  the  exercise  of the
          Intellectual  Property  Rights  does not  infringe  upon or  otherwise
          violate,  and the exercise of any rights  granted to the Company under
          any  Intellectual  Property License would not infringe upon or violate
          any  intellectual  property  rights  of any third  party.  To the best
          knowledge of the Company,  except as set forth in Section 3(s)(vi), no
          person  is  infringing   upon  or  otherwise   violating  any  of  the
          Intellectual  Property  Rights.  None of the Company or its affiliates
          has received notice of any claims, and there are no pending claims, of
          any  persons  relating  to the scope,  ownership  or use of any of the
          Intellectual Property Rights.

               (vii)  Each  copyright   registration,   patent,  and  registered
          trademark and application  therefor listed in Section  3(s)(ii) of the
          Disclosure  Schedule is valid,  subsisting and in proper form, and has
          been  duly  maintained,  including  the  submission  of all  necessary
          filings in accordance with the legal and  administrative  requirements
          of the  appropriate  jurisdictions.  There  have been no  failures  in
          complying  with such  requirements.  Except  as  provided  in  Section
          3(s)(ii) of the  Disclosure  Schedule,  no such  Copyright,  Patent or
          Trademark has lapsed and there has been no cancellation or abandonment
          thereof.

               (viii) With respect to each patent and patent  application listed
          in Section 3(s) of the  Disclosure  Schedule,  there are no defects of
          form in the preparation or filing of the  applications  thereof.  Each
          pending  application  is  being  diligently  prosecuted.   During  the
          prosecution  of each Patent,  (A) all pertinent  prior art  references
          known to the Company or its counsel was properly disclosed to the PTO,
          and  (B)   neither   such   counsel   nor   the   Company   made   any
          misrepresentation to, or concealed any material fact from, the PTO.

               (ix) The execution and delivery of this Agreement and the Related
          Agreements  and the  taking of the  actions  contemplated  hereby  and
          thereby  will not alter any of the rights of the  Company in or to the
          Intellectual Property Rights.

          (t)  Environmental  Matters.  The  Company is in  compliance  with the
     provisions  of all federal,  state and local laws  relating to pollution or
     protection of the  environment  applicable to it or to real property leased
     by it or to the use, operation or occupancy thereof,  except for violations
     or liabilities which  individually or in the aggregate could not reasonably
     be expected to have a Company Material Adverse Effect.  The Company has not
     engaged in any activity in violation of any provision of any federal, state
     or local law relating to pollution or protection of the environment,  which
     violation could  reasonably be expected to have a Company  Material Adverse
     Effect.  The Company has no liability,  absolute or  contingent,  under any
     federal,  state or local law  relating to pollution  or  protection  of the
     environment,  except for liabilities which individually or in the aggregate
     could not reasonably be expected to have a Company Material Adverse Effect.

          (u)  Registration  Rights.  Except as set forth in Section 3(u) of the
     Disclosure  Schedule,  the Company is not a party to any agreement granting
     registration rights to any person with respect to any of its equity or debt
     securities.  Upon  execution  of the Revised  Agreements  and the  consents
     listed in Section 3(b) of the Disclosure  Schedule,  the Purchaser's rights
     under the  Registration  Rights  Agreement will not be  subordinated to the
     registration rights of any other person.

          (v)  Agreements.  Section 3(v) of the Disclosure  Schedule  contains a
     list of each  agreement or  instrument  (including  any and all  amendments
     thereto) to which the Company is a party as of the date hereof and which is
     or, immediately following the consummation of the transactions contemplated
     by this Agreement, will be, material to the business,  condition or results
     of operations of the Company.  Each such agreement or instrument (including
     any and all amendments thereto) is in full force and effect and constitutes
     a legal,  valid and binding  obligation  of (i) the Company and (ii) to the
     best knowledge of the Company,  the other respective parties thereto,  and,
     to the best knowledge of the Company,  no person is in default or breach of
     (with or  without  the  giving of notice or the  passage  of time) any such
     agreement or instrument.

          (w) Availability of Documents. Section 3(w) of the Disclosure Schedule
     contains a true, correct and complete copy of the Company's  Certificate of
     Incorporation,  together with all amendments thereto.  The Company has also
     heretofore  provided or made available to the Purchaser an accurate copy of
     its  by-laws  and has  heretofore  made  available  for  inspection  by the
     Purchaser all written agreements,  arrangements,  commitments and documents
     referred to herein or in the Disclosure  Schedule,  in each case,  together
     with all amendments  and  supplements  thereto.  The Company has heretofore
     made available for inspection by the Purchaser its corporate  minute books.
     Such  corporate  minute  books  contain the minutes of all the  meetings of
     stockholders, board of directors and any committees thereof which have been
     held since the Company's date of incorporation  and all written consents to
     action executed in lieu thereof.

          (x) Business  Relations.  To the knowledge of the  Company,no  client,
     customer or supplier  will cease to do business with the Company due to the
     consummation  of the  transactions  contemplated  by this  Agreement or the
     Related Agreements.

          (y) Interest in Competitors,  Suppliers, Customers, etc. Except as set
     forth on Section  3(y) of the  Disclosure  Schedule or with  respect to the
     ownership of less than 1% of the outstanding  publicly traded securities of
     an entity, neither the Company nor its officers,  directors,  or affiliates
     have any  ownership  interest  in any  competitor,  supplier,  customer  or
     franchisee of the Company.

          (z)  Private  Offering.  Assuming  the  accuracy  of  the  Purchaser's
     representations set forth in Section 4(c) herein, the offer and sale of the
     Shares  and the  Warrant  hereunder  is exempt  from the  registration  and
     prospectus delivery requirements of the Securities Act. Neither the Company
     nor any  person  acting on  behalf of it has taken or will take any  action
     which would subject the offering and issuance of any of such  securities to
     the  provisions of Section 5 of the  Securities Act or to the provisions of
     any securities law, rule or regulation of any applicable jurisdiction.

          (aa) NASDAQ Listing Qualifications.  Except for the minimum bid price,
     upon  Closing,  the  Company  will be in full  compliance  with the initial
     listing  requirements  of The Nasdaq  SmallCap Market and after due inquiry
     the Company has no  knowledge  of any  condition,  event,  or  circumstance
     relating  to  the  Company,   its  officers,   directors,   or  significant
     stockholders which would cause the Company's application to list the Common
     Stock on The Nasdaq SmallCap Market not to be approved.

          (bb) Disclosure.  No representation or warranty to Purchaser contained
     in this Agreement and no statement  contained in the Disclosure Schedule or
     any  Officer's  Certificate  of  the  Company  furnished  pursuant  to  the
     provisions  hereof,  contains any untrue  statement  of a material  fact or
     omits to state a material  fact  necessary in order to make the  statements
     contained therein not misleading.


4. REPRESENTATIONS AND WARRANTIES OF THE PURCHASER.

     The Purchaser represents and warrants to the Company as follows:

     (a)  Organization  and  Standing  of  the  Purchaser.  The  Purchaser  is a
corporation duly organized, validly existing and in good standing (to the extent
such concept exists) under the laws of the State of Delaware.

     (b) Authority; Enforceability; No Conflict. The Purchaser has all requisite
corporate  power and authority to enter into this Agreement and to carry out its
obligations hereunder. The execution, delivery and performance of this Agreement
by the  Purchaser  have  been  duly  and  validly  authorized  by all  requisite
corporate  proceedings on the part of the  Purchaser.  This Agreement is a valid
and binding  obligation of the Purchaser,  enforceable  against it in accordance
with its terms,  except that (i) such  enforcement may be subject to bankruptcy,
insolvency,    reorganization,    moratorium,    rehabilitation,    liquidation,
conservatorship,  receivership  or other similar laws now or hereafter in effect
relating  to  creditors'  rights  generally  and (ii)  the  remedy  of  specific
performance and injunctive and other forms of equitable relief may be subject to
equitable  defenses  and to  the  discretion  of  the  court  before  which  any
proceeding therefor may be brought. The execution and delivery of this Agreement
by the Purchaser do not, and  consummation by the Purchaser of the  transactions
contemplated  hereby will not, result in or constitute (i) a default,  breach or
violation of or under the organizational  documents of the Purchaser,  or (ii) a
default, breach or violation of or under any mortgage, deed of trust, indenture,
note, bond, license,  lease agreement or other instrument or obligation to which
the Purchaser is a party or by which any of its  properties or assets are bound,
except for any defaults, breaches or violations which would not, individually or
in the aggregate,  have a material adverse effect on the Purchaser or prevent or
materially   delay  the  consummation  by  the  Purchaser  of  the  transactions
contemplated  hereby,  or (iii) a violation  of any statute,  rule,  regulation,
order, judgment or decree of any court, public body or authority, except for any
violations  which would not,  individually or in the aggregate,  have a material
adverse effect on the Purchaser or prevent or materially  delay the consummation
by the Purchaser of the transactions contemplated hereby.

     (c)  Acquisition  for  Investment.  The Purchaser is either an  "accredited
investor," as that term is defined in  230.501(a)  of the rules and  regulations
promulgated   by  the  SEC  under  the  1933  Act  or  a  person   described  in
230.506(b)(ii)  of such rules and  regulations.  The  Purchaser is acquiring the
Shares and the Warrant  solely for its own account for the purpose of investment
and not with a view to or for sale in connection with any distribution  thereof,
and has no present  intention or plan to effect any  distribution of such Shares
or the Warrant. The Purchaser acknowledges that it is able to bear the financial
risks  associated  with an investment in the Shares and the Warrant.  The Shares
and Warrant may bear a legend to the following effect:

 "THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER
 THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF ANY STATE IN
     RELIANCE ON CERTAIN EXEMPTIONS FROM REGISTRATION THEREUNDER. THE SALE,
    PLEDGE, HYPOTHECATION OR OTHER TRANSFER OF SUCH SECURITIES IS SUBJECT TO
          COMPLIANCE WITH APPLICABLE SECURITIES LAWS AND REGULATIONS."


5. CONDUCT OF BUSINESS OF THE COMPANY.

     Except  as  expressly   contemplated  by  this  Agreement  or  the  Related
Agreements,  during the period from the date hereof  through  the  Closing,  the
Company will conduct its operations according to its ordinary course of business
and consistent with past practice,  and the Company will use its best efforts to
preserve intact its business organization, to keep available the services of its
officers and employees and to maintain existing relationships with customers and
others having business relationships with it. Without limiting the generality of
the foregoing,  and except as otherwise expressly contemplated by this Agreement
or the  Related  Agreements  or as set  forth  in  Section  5 of the  Disclosure
Schedule,  prior to the Closing, the Company will not, without the prior written
consent of the Purchaser:

     (a) amend its Certificate of Incorporation or By-Laws;

     (b) (i) except in  accordance  with the existing  terms of the  convertible
securities,  warrants, options and other agreements disclosed on Section 3(c) of
the Disclosure Schedule,  authorize for issuance,  issue, sell, deliver or agree
or commit to issue, sell or deliver (whether through the issuance or granting of
options, warrants, commitments,  subscriptions, rights to purchase or otherwise)
any  securities  of any class,  or (ii) amend in any respect any of the terms of
any such  securities  outstanding  as of the date  hereof,  except to the extent
required by the express terms on the date hereof of such securities;

     (c) split, combine or reclassify any shares of its capital stock,  declare,
set aside or pay any dividend or other distribution  (whether in cash, stock, or
property or any combination thereof) in respect of its capital stock (except for
dividends on the existing  preferred  stock in  accordance  with its terms),  or
redeem, retire, repurchase or otherwise acquire, directly or indirectly,  any of
its securities or adopt a plan of complete or partial liquidation or resolutions
providing for or authorizing any such liquidation;

     (d) incur any additional Indebtedness,  except for short-term borrowings or
other Indebtedness  incurred in the ordinary course of business,  or mortgage or
pledge any of its assets, tangible or intangible;

     (e)  acquire,  sell,  lease or dispose of any assets  outside the  ordinary
course of business;

     (f) make any  change  in any of the  accounting  principles  or  practices,
methods or practices or business policies used by it;

     (g) acquire (by merger,  consolidation,  or acquisition of stock or assets)
any corporation, partnership or other business organization or division thereof;

     (h) pay,  discharge  or satisfy  any  claims,  liabilities  or  obligations
(absolute,  accrued, contingent or otherwise),  other than pursuant to the terms
of this Agreement, the payment, discharge or satisfaction in the ordinary course
of business consistent with past practice or, in accordance with their terms, of
liabilities  reflected or reserved against in the February Balance Sheet (or the
notes thereto) or incurred in the ordinary  course of business  consistent  with
past practice;

     (i) increase the compensation  payable to the officers and employees of the
Company,  except for  increases in salary or wages (a) in  accordance  with past
practice or (b) in conjunction with promotions or other changes in job status in
the ordinary course of business;

     (j) pay, loan or advance any amounts to,  transfer or lease any  properties
or  assets  to or enter  into  any  contract  or  agreement  with any  officers,
directors,  employees or  shareholders  of the  Company,  except with respect to
directors'  fees  and  compensation  to  officers  and  employees  at  rates  in
accordance with past practice,  and except with respect to reimbursable business
expenses of a nature and in amounts  reasonably  related to the  requirements of
the business of the Company;

     (k) waive or release any rights of material  value or  terminate or fail to
renew any material contract; or

     (l) take, or agree in writing or otherwise to take, directly or indirectly,
any of the actions described in Sections 5(a) through 5(k).


6. ADDITIONAL AGREEMENTS.

     (a) Access to  Information;  Confidentiality.  From the date  hereof to the
Closing,  the Company  shall afford the  officers,  employees  and agents of the
Purchaser  access  during  normal  business  hours  to the  Company's  officers,
employees, agents, properties, offices and all books and records of the Company,
and shall furnish the Purchaser with all financial, operating and other data and
information  concerning  the Company as the  Purchaser,  through  its  officers,
employees or agents,  may request and shall  cooperate  fully with the Purchaser
and its representatives in their examination of the Company.

     The Purchaser  will, and will cause its  affiliates,  partners,  directors,
officers,   employees,   agents,    representatives   and   financial   advisors
(collectively, "Representatives") to, hold in strict confidence all Confidential
Information  (as hereinafter  defined),  and not disclose the same to any person
without the prior consent of the Company,  unless compelled to disclose any such
Confidential  Information  by  judicial  or  administrative  process  or, in the
written  opinion  of their  counsel,  by  other  requirements  of law.  Prior to
disclosing any Confidential  Information to any such person,  the Purchaser will
inform such person and its  representatives  of the confidential  nature thereof
and will obtain from such person its agreement to be bound by the  provisions of
this paragraph as if references  herein to the Purchaser were references to such
person.  If this Agreement is terminated,  the Purchaser will promptly return to
the Company or destroy all documents (including all copies thereof) furnished by
the  Company  and  received  by the  Purchaser  or  any  of its  Representatives
containing such  Confidential  Information.  For purposes hereof,  "Confidential
Information" shall mean all confidential  nonpublic  information  concerning the
Company that the  Purchaser  obtains from the Company,  or its  representatives,
excluding any such information  that  subsequently  becomes  publicly  available
(other than directly or indirectly  through acts of the Purchaser) and excluding
any such  information  which is currently in the  possession of the Purchaser or
its  affiliates  or  obtained by them from the  Company in  connection  with the
performance of the License Agreement.

     (b) Best Efforts. Subject to the terms and conditions herein provided, each
of the parties  hereto  agrees to use its best  efforts to take,  or cause to be
taken,  all  actions,  and to do,  or cause to be done,  all  things  reasonably
necessary,  proper  or  advisable  under  applicable  laws  and  regulations  to
consummate and make effective the  transactions  contemplated  by this Agreement
and the Related Agreements as promptly as practicable. In case at any time after
the  Closing any  further  action is  necessary  or  desirable  to carry out the
purposes of this Agreement and the Related  Agreements,  the proper officers and
directors  of each party  hereto shall take all such  reasonable  and  necessary
action.

     (c) Public  Announcements.  The Purchaser and the Company will consult with
each other  before  issuing  any press  release or  otherwise  making any public
statements with respect to the  transactions  contemplated by this Agreement and
the Related  Agreements,  and shall not issue any such press release or make any
such public statement prior to such  consultation,  except as may be required by
applicable  law,  and  then  only  after  reasonable  prior  notice  and  giving
reasonable  opportunity  to comment to the other  party.  The Company  shall not
disclose the identity of the Purchaser in any such press release or other public
statement  without the prior written consent of the Purchaser,  except as may be
required by applicable law, and then only after giving the Purchaser  reasonable
prior notice and reasonable opportunity to comment of the disclosure.

     (d) Supplements to Disclosure  Schedule.  Prior to the Closing, the Company
will  supplement  or amend the  Disclosure  Schedule  with respect to any matter
hereafter arising which, if existing or occurring at the date of this Agreement,
would  have  been  required  to be set  forth  or  described  in the  Disclosure
Schedule. No supplement or amendment of the Disclosure Schedule made pursuant to
this  section  shall be  deemed  to cure any  breach  of any  representation  or
warranty made in this Agreement unless the Purchaser specifically agrees thereto
in writing.

     (e)  Directors.  For so long as the  Purchaser  or any of its  wholly-owned
subsidiaries  shall own  and/or  have the right to acquire  from the  Company at
least 2,500,000  million shares  (subject to adjustment for stock splits,  stock
dividends,  subdivisions,  etc.) of Common Stock in the aggregate, the Purchaser
shall be  entitled to propose  one  candidate  (the  "Purchaser  Designee")  for
election to the Board of  Directors  of the  Company.  Subject to its  fiduciary
duties to stockholders,  the Company will recommend to its stockholders that the
Purchaser Designee be elected to the Company's Board of Directors.

     (f) NASDAQ Listing  Application.  As soon as  practicable,  but in no event
more than 30 days after the bid price of the Common  Stock closes at the minimum
amount for any  minimum  time  period  required  by The Nasdaq  SmallCap  Market
initial  listing  requirements,  the Company  will  complete  and file a listing
application for the Common Stock together with all required  documents and shall
use its best  efforts to cause the  Common  Stock  including  the Shares and the
shares  issuable upon exercise of the Warrant to be listed and to continue to be
listed on The Nasdaq SmallCap Market.

     (g) Termination of Loan Agreement.  Any obligation of the Purchaser to make
any  loans  under the Loan  Agreement  shall  terminate  upon the  Closing.  The
Purchaser  shall file a Uniform  Commercial  Code  statement  to  terminate  its
security interest in collateral for loans under the Loan Agreement.

     (h) Conversion of Preferred Stock. The Company agrees to use its reasonable
efforts to take, or cause to be taken,  all reasonable  actions,  and to do, and
cause to be done,  all things  reasonably  necessary  for the  conversion of the
shares of Series B and Series D  Preferred  Stock of the Company  including  all
accrued dividends  thereon into Common Stock at the applicable  conversion rates
provided in the respective terms of such series as soon as practicable after the
Closing.

7. CONDITIONS PRECEDENT TO THE OBLIGATION OF THE COMPANY TO ISSUE THE SHARES AND
WARRANT AND OF THE PURCHASER TO PURCHASE THE SHARES AND THE WARRANT.

     The respective  obligations  hereunder of the Company to issue and sell the
Shares and the  Warrant  and of the  Purchaser  to  purchase  the Shares and the
Warrant are subject to the  satisfaction,  at or before the Closing,  of each of
the following conditions set forth in paragraphs (a) through (c) below.

     (a)  Consents.  The consents and approvals set forth in Section 3(b) of the
Disclosure Schedule shall have been obtained.

     (b) No Injunction.  No statute, rule, regulation,  executive order, decree,
ruling or injunction shall have been enacted,  entered,  promulgated or enforced
by any court or governmental authority of competent jurisdiction which prohibits
the consummation of any of the transactions contemplated by this Agreement.

     (c) Related Agreements. The Related Agreements shall have been executed and
delivered by the parties thereto.


8. CONDITIONS  PRECEDENT TO THE OBLIGATION OF THE COMPANY TO SELL THE SHARES AND
WARRANT.

     The  obligation  hereunder of the Company to sell the Shares and Warrant to
the Purchaser is further subject to the satisfaction,  at or before the Closing,
of each of the following  conditions  set forth in paragraphs (a) and (b) below.
These  conditions  are for the  Company's  sole benefit and may be waived by the
Company at any time in its sole discretion.

     (a)  Accuracy  of  the  Purchaser's  Representations  and  Warranties.  The
representations and warranties of the Purchaser shall be true and correct in all
material  respects as of the date when made and as of the Closing as though made
at that time  (except  for  representations  and  warranties  that speak as of a
particular date).

     (b)  Performance  by the  Purchaser.  The Purchaser  shall have  performed,
satisfied and complied in all material  respects with all covenants,  agreements
and conditions required by this Agreement to be performed, satisfied or complied
with by the Purchaser at or prior to the Closing.


9.  CONDITIONS  PRECEDENT  TO THE  OBLIGATION  OF THE  PURCHASER TO PURCHASE THE
SHARES AND WARRANT.

     The obligation of the Purchaser hereunder to acquire and pay for the Shares
and Warrant is subject to the satisfaction, at or before the Closing, of each of
the following  conditions set forth in paragraphs  (a) through (h) below.  These
conditions  are for the  Purchaser's  sole  benefit  and  may be  waived  by the
Purchaser at any time in its sole discretion.

     (a)  Accuracy  of  the  Company's   Representations  and  Warranties.   The
representations  and  warranties of the Company shall be true and correct in all
material  respects as of the date when made and as of the Closing as though made
at that time  (except  for  representations  and  warranties  that speak as of a
particular date).

     (b) Performance by the Company. The Company shall have performed, satisfied
and  complied  in all  material  respects  with all  covenants,  agreements  and
conditions  required by this  Agreement to be  performed,  satisfied or complied
with by the Company at or prior to the Closing.

     (c) Legal  Opinion.  The Purchaser  shall have received the opinion of Baer
Marks & Upham, substantially in the form set forth in Exhibit V hereto.

     (d) Compliance with Securities  Laws. The offering and sale by the Company,
at or prior to the  Closing,  of the Shares and Warrant  shall have been made in
compliance with all applicable requirements of federal and state securities laws
and the  Purchaser  shall have received  evidence  thereof in form and substance
reasonably satisfactory to it.

     (e) No  Offerings.  Neither the Company nor any of its  subsidiaries  shall
have offered, placed or sold, or caused or agreed to be offered, placed or sold,
any securities or other  obligations other than as part of the contemplated sale
of the Shares and Warrant and the capital structure as reflected herein.

     (f) Regulatory Approvals. All regulatory approvals shall have been obtained
by the Purchaser.

     (g) Conversion of Preferred Stock. All shares of Series E, Series F, Series
G and Series H Preferred  Stock of the Company  including all accrued  dividends
thereon shall be converted into Common Stock at the applicable  conversion rates
provided in the respective terms of such series.

     (h)  Cancellation  of  Warrants  for  Preferred  Stock.  All  warrants  for
Preferred  Stock or other rights to acquire any shares of Preferred Stock of the
Company  shall be  cancelled or converted to warrants or other rights to acquire
Common  Stock at a price per share no less than would have been  payable for the
Common  Shares  if the  warrants  or other  rights  had been  exercised  and the
Preferred Stock thereby acquired converted into Common Stock.

10. TERMINATION.

     (a) Right To Terminate.  Notwithstanding anything to the contrary set forth
in this  Agreement,  this  Agreement  may be  terminated  and  the  transactions
contemplated herein abandoned at any time prior to the Closing:

          (i) at any time by  mutual  written  consent  of the  Company  and the
     Purchaser;

          (ii) by either the Company or the  Purchaser if the Closing  shall not
     have  occurred  by June 30,  1998;  provided,  however,  that the  right to
     terminate  this  Agreement  under  this  Section  10(a)(ii)  shall  not  be
     available to any party whose failure to fulfill any  obligation  under this
     Agreement has been the cause of, or resulted in, the failure of the Closing
     to occur on or before such date; or

          (iii) by either the Company or the  Purchaser  if a court of competent
     jurisdiction  shall  have  issued  an order,  decree or ruling  permanently
     restraining,   enjoining  or   otherwise   prohibiting   the   transactions
     contemplated by this  Agreement,  and such order,  decree,  ruling or other
     action shall have become final and nonappealable.

     (b)  Obligations  to Cease.  In the  event  that  this  Agreement  shall be
terminated  pursuant to Section 10(a)  hereof,  all  obligations  of the parties
hereto under this Agreement  shall  terminate and there shall be no liability of
any party hereto to any other party except that (i) the provisions of the second
paragraph of Section  6(a),  Section 11, and Section  12(b) shall  survive,  and
shall be and  remain in full  force and  effect  and (ii)  nothing  herein  will
relieve any party from liability for any willful breach of this Agreement.

11. INDEMNIFICATION.

     (a) General  Indemnity.  The Company  agrees to indemnify and save harmless
the   Purchaser   (and   its   directors,    officers,   partners,   affiliates,
representatives,  advisors, successors and assigns) from and against any and all
losses,  liabilities,  deficiencies,  costs,  damages and  expenses  (including,
without limitation, interest, penalties, reasonable attorneys' fees, charges and
disbursements)  incurred by the  Purchaser  as a result of (i) any breach of the
representations,  warranties or covenants  made by the Company  herein or in the
Related  Agreements  or (ii)  any  action,  proceeding  or  claim  commenced  or
threatened  by a third  party in  connection  with this  Agreement,  the Related
Agreements and the transactions  contemplated hereby and thereby.  The Purchaser
agrees to indemnify and save harmless the Company (and its directors,  officers,
partners,  affiliates,  representatives,  advisors, successors and assigns) from
and against any and all losses,  liabilities,  deficiencies,  costs, damages and
expenses  (including,  without  limitation,   interest,  penalties,   reasonable
attorneys' fees, charges and disbursements)  incurred by the Company as a result
of any  breach  of the  representations,  warranties  or  covenants  made by the
Purchaser  herein or in the  Related  Agreements.  No party shall be entitled to
indemnification  hereunder unless and until the aggregate amount of such party's
indemnification  claims  exceeds  $15,000  and then to the full  extent  of such
claims.

     (b) Indemnification  Procedure. Any party entitled to indemnification under
this Section 11 (an "indemnified  party") will give prompt written notice to the
indemnifying  party of any claim with respect to which it seeks  indemnification
promptly after the discovery by such party of any matters giving rise to a claim
for  indemnification;  provided  that  the  failure  of any  party  entitled  to
indemnification  hereunder  to give notice as provided  herein shall not relieve
the  indemnifying  party of its obligations  under this Section 11 except to the
extent that the  indemnifying  party is actually  prejudiced  by such failure to
give  notice.  In case any  action,  proceeding  or claim is brought  against an
indemnified party in respect of which  indemnification is sought hereunder,  the
indemnifying  party  shall be  entitled  to  participate  in and,  unless in the
reasonable  judgment of the indemnified  party a conflict of interest between it
and the  indemnifying  party may exist in respect of such action,  proceeding or
claim, to assume the defense thereof,  with counsel  reasonably  satisfactory to
the  indemnified  party.  In the event that the  indemnifying  party  advises an
indemnified  party  that  it  will  contest  such a  claim  for  indemnification
hereunder,  or fails,  within thirty (30) days of receipt of any indemnification
notice to notify, in writing,  such person of its election to defend,  settle or
compromise,  at its sole cost and expense,  any action,  proceeding or claim (or
discontinues its defense at any time after it commences such defense),  then the
indemnified party may, at its option,  defend, settle or otherwise compromise or
pay such action or claim. In any event,  unless and until the indemnifying party
elects in writing to assume  and does so assume the  defense of any such  claim,
proceeding or action, the indemnified  party's costs and expenses arising out of
the defense,  settlement or  compromise of any such action,  claim or proceeding
shall be losses subject to  indemnification  hereunder.  The  indemnified  party
shall  cooperate  fully  with  the  indemnifying  party in  connection  with any
negotiation or defense of any such action or claim by the indemnifying party and
shall furnish to the indemnifying party all information  reasonably available to
the indemnified  party which relates to such action or claim.  The  indemnifying
party shall keep the  indemnified  party  fully  apprised at all times as to the
status of the defense or any settlement  negotiations  with respect thereto.  If
the  indemnifying  party  elects to defend  any such  action or claim,  then the
indemnified  party shall be entitled to participate in such defense with counsel
of its choice at its sole cost and expense.  The indemnifying party shall not be
liable for any settlement of any action,  claim or proceeding  effected  without
its written consent,  provided,  however,  that the indemnifying party shall not
unreasonably withhold, delay or condition its consent.  Anything in this Section
11 to the contrary  notwithstanding,  the indemnifying  party shall not, without
the indemnified party's prior written consent, settle or compromise any claim or
consent to entry of any  judgment in respect  thereof  which  imposes any future
obligation  on  the  indemnified  party  or  which  does  not  include,   as  an
unconditional  term thereof,  the giving by the claimant or the plaintiff to the
indemnified  party of a release from all liability in respect of such claim. The
indemnification  required by this Section 11 shall be made by periodic  payments
of the amount thereof during the course of the investigation or defense,  as and
when bills are received or expense,  loss, damage or liability is incurred.  The
indemnity  agreements  contained herein shall be in addition to (i) any cause of
action or similar right of the indemnified party against the indemnifying  party
or others,  (ii) the  indemnification  rights of the indemnified party under any
other agreement, and (iii) any liabilities the indemnifying party may be subject
to pursuant to the law.

12. MISCELLANEOUS.

     (a) Brokers.  The Company and the  Purchaser  represent and warrant to each
other that they have not taken any action which will result in any  liability of
the other to pay any broker's or finder's fee with respect to this  Agreement or
the transactions contemplated hereby.

     (b)  Expenses.  Each  party  hereto  shall  pay its own fees  and  expenses
incurred in connection with this Agreement.

     (c)   Survival  of   Representations,   Warranties   and   Covenants.   The
representations  and warranties set forth herein shall survive the Closing until
sixty days after the Company  shall have  delivered to the Purchaser the audited
financial  statements of the Company and its consolidated  subsidiaries (if any)
for the  fiscal  year  ended  December  31,  1998,  certified  by the  Company's
independent public accountants; provided that the representations and warranties
shall survive such date to the extent  written  notice of any breach  thereof is
given on or prior to such date and  representations  and warranties  relating to
Taxes shall survive until a date which is six months after the expiration of the
applicable statute of limitations. The covenants of the Company set forth herein
shall endure for so long as the Purchaser shall continue as a stockholder of the
Company or for such shorter period as may be specified herein.

     (d)  Assignment and Binding  Effect.  Neither the Company nor the Purchaser
shall assign all or any part of this Agreement without the prior written consent
of the other; provided, however, that the Purchaser,  without such prior written
consent,  may assign its rights hereunder to any entity or entities  directly or
indirectly  controlled by, or under common control with, it; provided,  further,
that no such  assignment  shall relieve the Purchaser of its  obligations  under
this Agreement. This Agreement shall be binding upon and inure to the benefit of
the permitted successors and assigns of the parties pursuant to this paragraph.

     (e) Headings.  Subject headings are included for convenience only and shall
not affect the interpretation of any provisions of this Agreement.

     (f) Notices. Any notice,  demand,  request,  waiver, or other communication
under this  Agreement  shall be in writing and shall be deemed to have been duly
given on the date of  service  if  personally  served  or on the third day after
mailing  if mailed to the party to whom  notice is to be given,  by first  class
mail,  registered,  return receipt  requested,  postage prepaid and addressed as
follows:

         To the Company:   Nestor, Inc.
                           One Richmond Square
                           Providence, Rhode Island 02906
                           Attention:  Chief Executive Officer

         With copies to:   Baer Marks & Upham
                           805 Third Avenue
                           New York, NY 10022-7513
                           Attention:  Herbert S. Meeker, Esq.

         To the            Transaction Systems Architects, Inc.
         Purchaser:        224 South 108 Avenue
                           Omaha, Nebraska  68154
                           Attention:  David P. Stokes

     (g) Governing  Law. THIS AGREEMENT  SHALL BE CONSTRUED IN ACCORDANCE  WITH,
AND GOVERNED BY, THE LAWS OF THE STATE OF DELAWARE AS APPLIED TO CONTRACTS  MADE
AND TO BE PERFORMED ENTIRELY IN THE STATE OF DELAWARE.

     (h) Entire Agreement. This Agreement,  including the Exhibits and Schedules
hereto, sets forth the entire  understanding and agreement of the parties hereto
relating  to the  matters  set forth  herein  and  supersedes  any and all other
understandings,  negotiations or agreements  between the parties hereto relating
to the matters set forth herein.

     (i) Counterparts.  This Agreement may be executed in counterparts,  each of
which shall be deemed an original,  and all of which together shall constitute a
single agreement.

     (j)  Severability.  In the  event  that  any one or more of the  provisions
contained in this Agreement shall for any reason be held to be invalid,  illegal
or  unenforceable,  the same  shall  not  affect  any  other  provision  of this
Agreement, but this Agreement shall be construed in a manner which, as nearly as
possible, reflects the original intent of the parties.

     (k) Words in Singular and Plural Form.  Words used in the singular  form in
this  Agreement  shall be deemed to import the plural,  and vice  versa,  as the
sense may require.

     (l) Amendment and  Modification.  This Agreement may be amended or modified
only by written agreement executed by all parties hereto.

     (m)  Waiver.  At any time prior to the  Closing,  any party  hereto may (i)
extend the time for the  performance of any of the  obligations or other acts of
any other party hereto,  (ii) waive any inaccuracies in the  representations and
warranties  contained herein or in any document  delivered  pursuant hereto, and
(iii)  waive  compliance  with any of the  agreements  or  conditions  contained
herein.  Any  agreement on the part of a party  hereto to any such  extension or
waiver shall be valid only if set forth in an  instrument  in writing  signed by
the party  granting such waiver but such waiver or failure to insist upon strict
compliance  with such  obligation,  covenant,  agreement or condition  shall not
operate as a waiver of, or estoppel  with respect to, any  subsequent  or future
failure.

     (n) Specific  Enforcement.  The Purchaser and the Company  acknowledge  and
agree  that  irreparable  damage  would  occur  in  the  event  that  any of the
provisions  of this  Agreement  were not  performed  in  accordance  with  their
specific terms or were  otherwise  breached.  It is accordingly  agreed that the
parties shall be entitled to an injunction or injunctions to prevent breaches of
the  provisions  of this  Agreement  and to enforce  specifically  the terms and
provisions  hereof in any court of the United States or any state thereof having
jurisdiction,  this being in addition  to any other  remedy to which they may be
entitled at law or equity.

     IN WITNESS  WHEREOF,  the parties hereto have executed this Agreement as of
the date first set forth above.

                                     NESTOR, INC.


                                     By:  /s/ Nigel Hebborn
                                          ---------------------------------
                                     Name: Nigel Hebborn
                                          ---------------------------------
                                     Title: Chief Financial Officer


                                     TRANSACTIONS SYSTEMS ARCHITECTS, INC.

                                     By:  /s/ William E. Fisher
                                          --------------------------------
                                     Name:  William E. Fisher
                                          --------------------------------      
                                     Title:  Chief Executive Officer
                                          --------------------------------





                                  NESTOR, INC.




                          Common Stock Purchase Warrant




                          Dated as of April 28, 1998
































This Warrant and any shares  acquired upon the exercise of this Warrant have not
been  registered  under the Securities  Act of 1933, as amended,  and may not be
transferred,  sold or otherwise  disposed of except while a  registration  under
such Act is in effect or pursuant to an exemption therefrom under such Act. This
Warrant  and  such  shares  may be  transferred  only  in  compliance  with  the
                     conditions specified in this Warrant.







                                     - iii -

                                TABLE OF CONTENTS



1.       Exercise of Warrant................................................. 1
         1.1      Manner of Exercise......................................... 1
         1.2      When Exercise Effective.................................... 1
         1.3      Delivery of Stock Certificates, etc........................ 2
         1.4      Company to Reaffirm Obligations............................ 2
         1.5      Payment by Application of Shares Otherwise Issuable........ 2

2.       Adjustment of Common Stock Issuable Upon Exercise................... 3
         2.1      General;  Warrant Price.................................... 3
         2.2      Adjustment of Warrant Price................................ 3
                  2.2.1    Issuance of Additional Shares of Common
                           Stock............................................. 3
                  2.2.2    Extraordinary Dividends and
                           Distributions..................................... 3
         2.3      Treatment of Options and Convertible Securities............ 4
         2.4      Treatment of Stock Dividends, Stock Splits, etc............ 6
         2.5      Computation of Consideration............................... 6
         2.6      Adjustments for Combinations, etc.......................... 8
         2.7      Dilution in Case of Other Securities....................... 8
         2.8      Minimum Adjustment of Warrant Price........................ 8

3.       Consolidation, Merger, etc.......................................... 8
         3.1      Adjustments for Consolidation, Merger, Sale of Assets, 
                  Reorganization, etc........................................ 8
         3.2      Assumption of Obligations.................................. 9

4.       Other Dilutive Events.............................................. 10

5.       No Dilution or Impairment.......................................... 10

6.       Accountants' Report as to Adjustments.............................. 10

7.       Notices of Corporate Action........................................ 11

8.       Registration of Common Stock....................................... 12

9.       Restrictions on Transfer........................................... 12
         9.1      Restrictive Legends....................................... 12

10.      Availability of Information........................................ 13

11.      Reservation of Stock, etc.......................................... 13

12.      Registration and Transfer of Warrants, etc......................... 13
         12.1     Warrant Register; Ownership of Warrants................... 13
         12.2     Transfer and Exchange of Warrants......................... 14
         12.3     Replacement of Warrants................................... 14

13.      Registration Rights................................................ 14

14.      Definitions........................................................ 14

15.      Remedies........................................................... 17

16.      No Rights or Liabilities as Stockholder............................ 17

17.      Notices............................................................ 18

18.      Amendments......................................................... 18

19.      Expiration......................................................... 18

20.      Descriptive Headings............................................... 18

21.      GOVERNING LAW...................................................... 18

22.      Judicial Proceedings; Waiver of Jury............................... 18


EXHIBIT A................................................................... 20

FORM OF SUBSCRIPTION........................................................ 21

FORM OF ASSIGNMENT.......................................................... 22



_______________________________


         

                                  NESTOR, INC.

                          Common Stock Purchase Warrant


 
No.                              April 28, 1998


     Nestor, Inc. (the "Company"),  a Delaware corporation,  for value received,
hereby  certifies  that  Transactions  Systems  Architects,   Inc.  ("TSA"),  or
registered  assigns,  is entitled to purchase from the Company  [2,500,000] duly
authorized, validly issued, fully paid and nonassessable shares of Common Stock,
par value $.01 per share (the  "Common  Stock"),  of the Company at the purchase
price per share of $3.00,  at any time or from time to time  prior to 5:00 P.M.,
New York City time,  on March 1, 2002 (or such  later date as may be  determined
pursuant to section 19), all subject to the terms,  conditions  and  adjustments
set forth below in this Warrant.

     This  Warrant  is being  issued by the  Company in  consideration  of TSA's
performance of its  obligations  pursuant to the Securities  Purchase  Agreement
dated as of , 1998 by and between the Company and TSA (the "Securities  Purchase
Agreement").  Certain  capitalized  terms used in this  Warrant  are  defined in
section 14; references to an "Exhibit" are, unless otherwise  specified,  to one
of the Exhibits  attached to this  Warrant and  references  to a "section"  are,
unless otherwise specified, to one of the sections of this Warrant.

1.       Exercise of Warrant. Warrant.

1.1 Manner of Exercise.  This Warrant may be exercised at any time by the holder
hereof,  in whole or in part,  during normal business hours on any Business Day,
by surrender of this Warrant to the Company at its principal office, accompanied
by a  subscription  substantially  in the form  attached  to this  Warrant (or a
reasonable  facsimile  thereof) duly executed by such holder and  accompanied by
payment,  in cash,  by certified or official  bank check payable to the order of
the Company, or in the manner provided in Section 1.5, in the amount obtained by
multiplying  (a) the number of shares of Common Stock (without  giving effect to
any adjustment  thereof)  designated in such  subscription by (b) $3.00 and such
holder  shall  thereupon  be entitled to receive the number of duly  authorized,
validly issued,  fully paid and  nonassessable  shares of Common Stock (or Other
Securities) determined as provided in sections 2 through 4.

1.2 When  Exercise  Effective.  Each exercise of this Warrant shall be deemed to
have been  effected  immediately  prior to the close of business on the Business
Day on which this Warrant shall have been surrendered to the Company as provided
in  section  1.1,  and at such time the Person or Persons in whose name or names
any certificate or certificates for shares of Common Stock (or Other Securities)
shall be issuable  upon such exercise as provided in section 1.3 shall be deemed
to have become the holder or holders of record thereof.

1.3  Delivery  of Stock  Certificates,  etc. As soon as  practicable  after each
exercise  of this  Warrant,  in whole or in part,  and in any event  within five
Business Days thereafter,  the Company at its expense  (including the payment by
it of any  applicable  issue  taxes)  will cause to be issued in the name of and
delivered  to the holder  hereof or,  subject to section 9, as such holder (upon
payment by such holder of any applicable transfer taxes) may direct,

          (a) a certificate or certificates  for the number of duly  authorized,
     validly  issued,  fully paid and  nonassessable  shares of Common Stock (or
     Other Securities) to which such holder shall be entitled upon such exercise
     plus, in lieu of any fractional  share to which such holder would otherwise
     be  entitled,  cash in an amount  equal to the same  fraction of the Market
     Price  per  share  on the  Business  Day  next  preceding  the date of such
     exercise, and

          (b) in case such  exercise is in part only,  a new Warrant or Warrants
     of like tenor,  calling in the  aggregate on the face or faces  thereof for
     the number of shares of Common Stock equal  (without  giving  effect to any
     adjustment  thereof) to the number of such shares called for on the face of
     this Warrant minus the number of such shares  designated by the holder upon
     such exercise as provided in section 1.1.

1.4  Company to Reaffirm  Obligations.  The  Company  will,  at the time of each
exercise of this Warrant, upon the request of the holder hereof,  acknowledge in
writing  its  continuing   obligation  to  afford  to  such  holder  all  rights
(including,  without  limitation,  any rights to  registration,  pursuant to the
Registration  Rights Agreement referred to in section 8, of the shares of Common
Stock or Other Securities  issued upon such exercise) to which such holder shall
continue to be entitled after such exercise in accordance with the terms of this
Warrant, provided that if the holder of this Warrant shall fail to make any such
request,  such failure shall not affect the continuing obligation of the Company
to afford such rights to such holder.

1.5 Payment by Application of Shares  Otherwise  Issuable.  Upon any exercise of
this  Warrant,  the holder hereof may, at its option,  instruct the Company,  by
written  notice  accompanying  the surrender of this Warrant at the time of such
exercise,  to apply to the  payment  required  by section 1.1 such number of the
shares of Common Stock  otherwise  issuable to such holder upon such exercise as
shall be specified  in such notice,  in which case an amount equal to the excess
of the aggregate  Current Market Price of such specified number of shares on the
date of  exercise  over the  portion of the  payment  required  by  section  1.1
attributable to such shares shall be deemed to have been paid to the Company and
the  number of shares  issuable  upon such  exercise  shall be  reduced  by such
specified number.

2. Adjustment of Common Stock Issuable Upon Exercise.Exercise.

2.1  General;  Warrant  Price.  The number of shares of Common  Stock  which the
holder of this Warrant  shall be entitled to receive upon each  exercise  hereof
shall be  determined by  multiplying  the number of shares of Common Stock which
would otherwise (but for the provisions of this section 2) be issuable upon such
exercise,  as designated  by the holder  hereof  pursuant to section 1.1, by the
fraction of which (a) the  numerator  is the price then  applicable  pursuant to
section  1.1(b) of this Warrant and (b) the  denominator is the Warrant Price in
effect on the date of such  exercise.  The "Warrant  Price"  shall  initially be
$3.00 per share. The Warrant Price shall be adjusted and readjusted from time to
time as further  provided in this  section 2 and, as so adjusted or  readjusted,
shall remain in effect until a further  adjustment  or  readjustment  thereof is
required by this section 2.

2.2 Adjustment of Warrant Price. of Warrant Price.

2.2.1 Issuance of Additional  Shares of Common Stock. In case the Company at any
time or from time to time after the date hereof  shall issue or sell  Additional
Shares of Common Stock (including Additional Shares of Common Stock deemed to be
issued  pursuant  to  section  2.3  or  2.4)  without  consideration  or  for  a
consideration  per share  less  than  $2.00  (subject  to  adjustment  for stock
dividends, stock splits, or subdivisions or combinations by reclassifications or
otherwise) per share,  then, and in each such case,  subject to section 2.8, the
Warrant  Price  in  effect  immediately  prior to such  issue or sale,  shall be
reduced,  concurrently  with such issue or sale, to a price  (calculated  to the
nearest  .001 of a cent)  equal to the  consideration  per  share  paid for such
Additional Shares of Common Stock. The Warrant Price shall not be increased as a
result of any such issue or sale.

2.2.2 Extraordinary Dividends and Distributions. In case the Company at any time
or from time to time after the date hereof shall declare,  order,  pay or make a
dividend or other distribution (including,  without limitation, any distribution
of other or additional  stock or other  securities or property or Options by way
of dividend or spin-off, reclassification, recapitalization or similar corporate
rearrangement)  on the  Common  Stock,  other  than a  dividend  payable  in (a)
Additional  Shares of Common Stock or (b) cash dividends  during any fiscal year
of the Company that do not exceed twenty percent (20%) of the after tax earnings
per share of the Common Stock for the immediately  preceding  fiscal year of the
Company,  then, and in each such case, subject to section 2.8, the Warrant Price
in effect  immediately  prior to the close of  business on the record date fixed
for the determination of holders of any class of securities  entitled to receive
such  dividend or  distribution  shall be reduced,  effective as of the close of
business on such record date,  to a price  (calculated  to the nearest .001 of a
cent) determined by multiplying such Warrant Price by a fraction

          (x) the numerator of which shall be the Current Market Price in effect
     on such record date or, if the Common Stock trades on an ex-dividend basis,
     on the date prior to the  commencement  of  ex-dividend  trading,  less the
     amount of such dividend or distribution (as determined in good faith by the
     Board of  Directors of the Company,  subject to  confirmation  by a firm of
     independent  certified public  accountants of recognized  national standing
     approved by TSA applicable to one share of Common Stock, and

          (y) the denominator of which shall be such Current Market Price.

2.3 Treatment of Options and Convertible Securities.  In case the Company at any
time or from time to time after the date  hereof  shall  issue,  sell,  grant or
assume, or shall fix a record date for the determination of holders of any class
of securities entitled to receive, any Options or Convertible Securities,  then,
and in each such case, the maximum  number of Additional  Shares of Common Stock
(as  set  forth  in the  instrument  relating  thereto,  without  regard  to any
provisions  contained  therein  for a  subsequent  adjustment  of  such  number)
issuable  upon the  exercise  of such  Options  or,  in the case of  Convertible
Securities and Options therefor,  the conversion or exchange of such Convertible
Securities, shall be deemed to be Additional Shares of Common Stock issued as of
the time of such issue, sale, grant or assumption or, in case such a record date
shall have been  fixed,  as of the close of business on such record date (or, if
the  Common  Stock  trades on an  ex-dividend  basis,  on the date  prior to the
commencement of ex-dividend  trading),  provided that such Additional  Shares of
Common  Stock shall not be deemed to have been issued  unless the  consideration
per share (determined pursuant to section 2.5) of such shares would be less than
$2.00 (subject to adjustment for stock dividends,  stock splits, or subdivisions
or  combinations  by  reclassifications  or otherwise) per share,  and provided,
further,  that in any such case in which  Additional  Shares of Common Stock are
deemed to be issued

          (a) no further  adjustment of the Warrant Price shall be made upon the
     subsequent  issue or sale of  Convertible  Securities  or  shares of Common
     Stock upon the  exercise of such Options or the  conversion  or exchange of
     such Convertible Securities;

          (b) if such Options or Convertible  Securities by their terms provide,
     with  the  passage  of  time  or   otherwise,   for  any  increase  in  the
     consideration  payable  to  the  Company,  or  decrease  in the  number  of
     Additional Shares of Common Stock issuable,  upon the exercise,  conversion
     or exchange  thereof (by change of rate or  otherwise),  the Warrant  Price
     computed upon the original  issue,  sale,  grant or assumption  thereof (or
     upon the  occurrence of the record date, or date prior to the  commencement
     of ex-dividend trading, as the case may be, with respect thereto),  and any
     subsequent  adjustments  based  thereon,  shall,  upon any such increase or
     decrease  becoming  effective,  be  recomputed  to reflect such increase or
     decrease insofar as it affects such Options, or the rights of conversion or
     exchange under such Convertible  Securities,  which are outstanding at such
     time;

          (c) upon the expiration  (or purchase by the Company and  cancellation
     or  retirement)  of any such Options which shall not have been exercised or
     the  expiration  of any rights of  conversion  or  exchange  under any such
     Convertible  Securities  which (or purchase by the Company and cancellation
     or retirement of any such  Convertible  Securities the rights of conversion
     or exchange under which) shall not have been  exercised,  the Warrant Price
     computed upon the original  issue,  sale,  grant or assumption  thereof (or
     upon the  occurrence of the record date, or date prior to the  commencement
     of ex-dividend trading, as the case may be, with respect thereto),  and any
     subsequent adjustments based thereon,  shall, upon such expiration (or such
     cancellation or retirement, as the case may be), be recomputed as if:

               (i) in the  case of  Options  for  Common  Stock  or  Convertible
          Securities,  the only Additional Shares of Common Stock issued or sold
          were the Additional Shares of Common Stock, if any, actually issued or
          sold upon the exercise of such Options or the  conversion  or exchange
          of such Convertible Securities and the consideration received therefor
          was the consideration  actually received by the Company for the issue,
          sale,  grant  or  assumption  of  all  such  Options,  whether  or not
          exercised,  plus the  consideration  actually  received by the Company
          upon such exercise,  or for the issue or sale of all such  Convertible
          Securities  which  were  actually  converted  or  exchanged,  plus the
          additional  consideration,  if any,  actually  received by the Company
          upon such conversion or exchange, and

               (ii) in the case of Options for Convertible Securities,  only the
          Convertible  Securities,  if any,  actually  issued  or sold  upon the
          exercise of such Options  were issued at the time of the issue,  sale,
          grant or assumption of such Options, and the consideration received by
          the Company for the  Additional  Shares of Common Stock deemed to have
          then  been  issued  was the  consideration  actually  received  by the
          Company for the issue,  sale, grant or assumption of all such Options,
          whether or not exercised,  plus the consideration  deemed to have been
          received by the Company  (pursuant  to section  2.5) upon the issue or
          sale of such Convertible Securities with respect to which such Options
          were actually exercised;

          (d) no  readjustment  pursuant to  subdivision  (b) or (c) above shall
     have the effect of  increasing  the Warrant Price by an amount in excess of
     the  amount of the  adjustment  thereof  originally  made in respect of the
     issue, sale, grant or assumption of such Options or Convertible Securities;
     and

          (e) in the case of any such  Options  which  expire by their terms not
     more  than 30 days  after  the date of  issue,  sale,  grant or  assumption
     thereof,  no  adjustment  of the  Warrant  Price  shall be made  until  the
     expiration or exercise of all such Options, whereupon such adjustment shall
     be made in the manner provided in subdivision (c) above.

2.4 Treatment of Stock Dividends,  Stock Splits, etc. In case the Company at any
time or from  time to time  after  the  date  hereof  shall  declare  or pay any
dividend  on the  Common  Stock  payable  in  Common  Stock,  or shall  effect a
subdivision of the  outstanding  shares of Common Stock into a greater number of
shares of Common Stock (by  reclassification  or otherwise  than by payment of a
dividend in Common  Stock),  then, and in each such case,  Additional  Shares of
Common  Stock  shall be deemed to have been  issued  (a) in the case of any such
dividend,  immediately  after the close of  business  on the record date for the
determination  of holders of any class of  securities  entitled to receive  such
dividend,  or (b) in the case of any such subdivision,  at the close of business
on the day immediately prior to the day upon which such corporate action becomes
effective.

2.5 Computation of Consideration. For the purposes of this section 2,

          (a) the  consideration  for the issue or sale of any Additional Shares
     of Common Stock shall,  irrespective  of the  accounting  treatment of such
     consideration,

               (i) insofar as it consists of cash, be computed at the net amount
          of cash received by the Company,  without  deducting any expenses paid
          or incurred by the Company or any commissions or compensation  paid or
          concessions or discounts  allowed to  underwriters,  dealers or others
          performing similar services in connection with such issue or sale,

               (ii)  insofar as it consists of property  (including  securities)
          other than cash,  be computed at the fair value thereof at the time of
          such  issue or  sale,  as  determined  in good  faith by the  Board of
          Directors  of the  Company  (subject  to  confirmation  by a  firm  of
          independent   certified  public  accountants  of  recognized  standing
          approved by TSA), and

               (iii) in case  Additional  Shares of Common  Stock are  issued or
          sold  together  with other stock or  securities or other assets of the
          Company for a consideration  which covers both, be the portion of such
          consideration  so  received,  computed  as provided in clauses (i) and
          (ii) above,  allocable to such Additional  Shares of Common Stock, all
          as  determined  in good faith by the Board of Directors of the Company
          (subject to  confirmation  by a firm of independent  certified  public
          accountants of recognized standing approved by TSA);

          (b)  Additional  Shares of  Common  Stock  deemed to have been  issued
     pursuant to section 2.3,  relating to Options and  Convertible  Securities,
     shall  be  deemed  to  have  been  issued  for a  consideration  per  share
     determined by dividing

               (i) the total  amount,  if any,  received and  receivable  by the
          Company as consideration  for the issue,  sale, grant or assumption of
          the Options or  Convertible  Securities in question,  plus the minimum
          aggregate  amount  of  additional  consideration  (as set forth in the
          instruments   relating  thereto,   without  regard  to  any  provision
          contained therein for a subsequent adjustment of such consideration to
          protect against  dilution) payable to the Company upon the exercise in
          full of such Options or the conversion or exchange of such Convertible
          Securities or, in the case of Options for Convertible Securities,  the
          exercise of such Options for Convertible Securities and the conversion
          or exchange of such  Convertible  Securities,  in each case  computing
          such consideration as provided in the foregoing subdivision (a), by

               (ii) the maximum  number of shares of Common  Stock (as set forth
          in the instruments  relating thereto,  without regard to any provision
          contained  therein  for a  subsequent  adjustment  of such  number  to
          protect against  dilution)  issuable upon the exercise of such Options
          or the conversion or exchange of such Convertible Securities; and

          (c)  Additional  Shares of  Common  Stock  deemed to have been  issued
     pursuant to section 2.4, relating to stock dividends,  stock splits,  etc.,
     shall be deemed to have been issued for no consideration.

2.6 Adjustments for Combinations, etc. In case the out-standing shares of Common
Stock shall be combined or consolidated,  by reclassification or otherwise, into
a lesser  number  of  shares  of  Common  Stock,  the  Warrant  Price in  effect
immediately prior to such combination or consolidation shall,  concurrently with
the  effectiveness  of such  combination or  consolidation,  be  proportionately
increased.

2.7 Dilution in Case of Other Securities.  In case any Other Securities shall be
issued or sold or shall become  subject to issue or sale upon the  conversion or
exchange  of any stock (or Other  Securities)  of the  Company (or any issuer of
Other  Securities  or  any  other  Person  referred  to  in  section  3)  or  to
subscription,  purchase or other  acquisition  pursuant to any Options issued or
granted by the Company (or any such other issuer or Person) for a  consideration
such as to dilute,  on a basis consistent with the standards  established in the
other provisions of this section 2, the purchase rights granted by this Warrant,
then, and in each such case, the  computations,  adjustments  and  readjustments
provided for in this  section 2 with respect to the Warrant  Price shall be made
as nearly as  possible in the manner so provided  and applied to  determine  the
amount of Other Securities from time to time receivable upon the exercise of the
Warrants,  so as to protect  the holders of the  Warrants  against the effect of
such dilution.

2.8 Minimum  Adjustment of Warrant Price. If the amount of any adjustment of the
Warrant Price required pursuant to this section 2 would be less than one percent
(1%) of the Warrant Price in effect at the time such  adjustment is otherwise so
required to be made,  such amount shall be carried  forward and adjustment  with
respect thereto made at the time of and together with any subsequent  adjustment
which,  together  with such  amount  and any other  amount or amounts so carried
forward, shall aggregate at least one percent (1%) of such Warrant Price.

3. Consolidation, Merger, etc.ger, etc.

3.1 Adjustments for Consolidation,  Merger, Sale of Assets, Reorganization, etc.
In case the Company  after the date hereof (a) shall  consolidate  with or merge
into any other Person and shall not be the  continuing or surviving  corporation
of such  consolidation  or  merger,  or (b) shall  permit  any  other  Person to
consolidate  with or  merge  into  the  Company  and the  Company  shall  be the
continuing or surviving  Person but, in connection  with such  consolidation  or
merger,  the Common Stock or Other Securities shall be changed into or exchanged
for stock or other securities of any other Person or cash or any other property,
or (c) shall  transfer all or  substantially  all of its properties or assets to
any other Person, (d) shall effect a capital  reorganization or reclassification
of the Common Stock or Other Securities (other than a capital  reorganization or
reclassification resulting in the issue of Additional Shares of Common Stock for
which adjustment in the Warrant Price is provided in section 2.2.1 or 2.2.2), or
(e) shall  engage in a statutory  plan of exchange in which the Common  Stock or
Other  Securities  shall be exchanged for stock or other securities of any other
Person then, and in the case of each such transaction, proper provision shall be
made so that,  upon the basis and the terms and in the manner  provided  in this
Warrant, the holder of this Warrant,  upon the exercise hereof at any time after
the  consummation  of such  transaction,  shall be  entitled  to receive (at the
aggregate  Warrant  Price in  effect  at the time of such  consummation  for all
Common Stock or Other Securities  issuable upon such exercise  immediately prior
to such consummation),  in lieu of the Common Stock or Other Securities issuable
upon such exercise prior to such consummation, the highest amount of securities,
cash or other property to which such holder would actually have been entitled as
a  shareholder  upon such  consummation  if such holder had exercised the rights
represented by this Warrant  immediately  prior thereto,  subject to adjustments
(subsequent  to such  consummation)  as nearly  equivalent  as  possible  to the
adjustments provided for in sections 2 through 4.

3.2  Assumption  of  Obligations.  Notwithstanding  anything  contained  in  the
Warrants or in the  Purchase  Agreement  to the  contrary,  the Company will not
effect any of the  transactions  described in clauses (a) through (e) of section
3.1 unless,  prior to the  consummation  thereof,  each  Person  (other than the
Company)  which may be  required  to  deliver  any  stock,  securities,  cash or
property upon the exercise of this Warrant as provided  herein shall assume,  by
written instrument  delivered to, and reasonably  satisfactory to, the holder of
this Warrant,  (a) the obligations of the Company under this Warrant (and if the
Company shall survive the  consummation  of such  transaction,  such  assumption
shall be in addition to, and shall not release the Company from,  any continuing
obligations  of the Company  under this  Warrant),  (b) the  obligations  of the
Company  under the  Registration  Rights  Agreement  and (c) the  obligation  to
deliver to such holder such shares of stock, securities, cash or property as, in
accordance  with the foregoing  provisions of this section 3, such holder may be
entitled to receive,  and such Person  shall have  similarly  delivered  to such
holder an opinion of counsel for such Person,  which counsel shall be reasonably
satisfactory to such holder, stating that this Warrant shall thereafter continue
in full force and effect and the terms hereof  (including,  without  limitation,
all of the  provisions  of this  section  3) shall be  applicable  to the stock,
securities,  cash or property  which such Person may be required to deliver upon
any exercise of this Warrant or the exercise of any rights pursuant hereto.

4.  Other  Dilutive  Events.  In case any  event  shall  occur  as to which  the
provisions of section 2 or section 3 are not strictly applicable but the failure
to make any adjustment would not fairly protect the purchase rights  represented
by this Warrant in accordance  with the essential  intent and principles of such
sections,  then,  in  each  such  case,  the  Company  shall  appoint  a firm of
independent  certified public accountants of recognized  national standing (such
firm to be subject  to the  approval  of TSA),  which  shall give their  opinion
regarding  the  adjustment,  if any, on a basis  consistent  with the  essential
intent and  principles  established  in sections 2 and 3, necessary to preserve,
without dilution,  the purchase rights represented by this Warrant. Upon receipt
of such opinion,  the Company will promptly mail a copy thereof to the holder of
this Warrant and shall make the adjustments described therein.

5. No  Dilution  or  Impairment.  The  Company  will not,  by  amendment  of its
certificate   of   incorporation   or   through   any   consolidation,   merger,
reorganization,  transfer of assets, dissolution, issue or sale of securities or
any other voluntary action, avoid or seek to avoid the observance or performance
of any of the terms of this Warrant,  but will at all times in good faith assist
in the  carrying  out of all such terms and in the taking of all such  action as
may be necessary or  appropriate in order to protect the rights of the holder of
this  Warrant  against  dilution  or  other  impairment.  Without  limiting  the
generality  of the  foregoing,  the Company (a) will not permit the par value of
any shares of stock  receivable  upon the exercise of this Warrant to exceed the
amount payable therefor upon such exercise, (b) will take all such action as may
be  necessary or  appropriate  in order that the Company may validly and legally
issue  fully  paid and  nonassessable  shares  of stock on the  exercise  of the
Warrants from time to time  outstanding,  and (c) will not take any action which
results in any  adjustment of the Warrant Price if the total number of shares of
Common Stock (or Other  Securities)  issuable after the action upon the exercise
of all of the  Warrants  would exceed the total number of shares of Common Stock
(or  Other   Securities)  then  authorized  by  the  Company's   certificate  of
incorporation and available for the purpose of issue upon such exercise.

6.  Accountants'  Report as to  Adjustments.  In each case of any  adjustment or
readjustment in the shares of Common Stock (or Other  Securities)  issuable upon
the exercise of this Warrant,  the Company at its expense will promptly  compute
such adjustment or readjustment in accordance with the terms of this Warrant and
cause independent certified public accountants of recognized standing (such firm
to be subject to the  approval  of TSA)  selected  by the Company to verify such
computation  and prepare a report setting forth such  adjustment or readjustment
and showing in reasonable detail the method of calculation thereof and the facts
upon which such adjustment or  readjustment  is based,  including a statement of
(a)  the  consideration  received  or to be  received  by the  Company  for  any
Additional  Shares of Common Stock issued or sold or deemed to have been issued,
(b)  the  number  of  shares  of  Common  Stock  outstanding  or  deemed  to  be
outstanding, and (c) the Warrant Price in effect immediately prior to such issue
or sale and as adjusted  and  readjusted  (if  required by section 2) on account
thereof.  The  Company  will  forthwith  mail a copy of each such report to each
holder of a Warrant and will, upon the written request at any time of any holder
of a Warrant,  furnish to such  holder a like report  setting  forth the Warrant
Price  at the  time in  effect  and  showing  in  reasonable  detail  how it was
calculated.  The  Company  will also  keep  copies  of all such  reports  at its
principal  office and will cause the same to be available for inspection at such
office  during  normal  business  hours  by  any  holder  of a  Warrant  or  any
prospective purchaser of a Warrant designated by the holder thereof.

7. Notices of Corporate Action. In the event of

               (a) any taking by the  Company of a record of the  holders of any
          class of securities for the purpose of determining the holders thereof
          who are  entitled  to  receive  any  dividend  (other  than a  regular
          periodic  dividend  payable in cash out of earned surplus in an amount
          not exceeding the amount of the  immediately  preceding  cash dividend
          for such period) or other distribution, or any right to subscribe for,
          purchase or otherwise  acquire any shares of stock of any class or any
          other securities or property, or to receive any other right, or

               (b)   any   capital    reorganization   of   the   Company,   any
          reclassification  or  recapitalization  of the  capital  stock  of the
          Company or any  consolidation  or merger involving the Company and any
          other Person or any transfer of all or substantially all the assets of
          the Company to any other Person, or

               (c) any  voluntary or  involuntary  dissolution,  liquidation  or
          winding-up of the Company,

the Company  will mail to each holder of a Warrant a notice  specifying  (i) the
date or expected date on which any such record is to be taken for the purpose of
such  dividend,  distribution  or right,  and the amount and  character  of such
dividend, distribution or right, and (ii) the date or expected date on which any
such reorganization, reclassification,  recapitalization, consolidation, merger,
transfer, dissolution,  liquidation or winding-up is to take place and the time,
if any such time is to be fixed,  as of which  the  holders  of record of Common
Stock (or Other Securities) shall be entitled to exchange their shares of Common
Stock (or Other  Securities)  for the securities or other  property  deliverable
upon such  reorganization,  reclassification,  recapitalization,  consolidation,
merger, transfer,  dissolution,  liquidation or winding-up. Such notice shall be
mailed at least 45 days prior to the date therein specified.

8.  Registration  of Common Stock.  If any shares of Common Stock required to be
reserved for purposes of exercise of this Warrant require  registration  with or
approval  of any  governmental  authority  under any federal or state law (other
than the  Securities  Act) before such shares may be issued upon  exercise,  the
Company  will,  at its expense and as  expeditiously  as possible,  use its best
efforts to cause such shares to be duly registered or approved,  as the case may
be. The shares of Common Stock (and Other Securities)  issuable upon exercise of
this Warrant (or upon  conversion of any shares of Common Stock issued upon such
exercise) shall  constitute  Registrable  Securities (as such term is defined in
the  Registration  Rights  Agreement).  Each  holder  of this  Warrant  shall be
entitled to all of the  benefits  afforded  to a holder of any such  Registrable
Securities  under the  Registration  Rights  Agreement  and such holder,  by its
acceptance of this  Warrant,  agrees to be bound by and to comply with the terms
and conditions of the Registration Rights Agreement applicable to such holder as
a holder of such  Registrable  Securities.  At any such time as Common  Stock is
listed on any national  securities  exchange or automated  quotation system, the
Company  will,  at its  expense,  obtain  promptly and maintain the approval for
listing on each such  exchange or  quotation  system,  upon  official  notice of
issuance,  the  shares  of  Common  Stock  issuable  upon  exercise  of the then
outstanding  Warrants  and  maintain  the  listing of such  shares  after  their
issuance; and the Company will also list on such national securities exchange or
quotation  system,  will register  under the Exchange Act and will maintain such
listing of, any Other  Securities that at any time are issuable upon exercise of
the Warrants,  if and at the time that any securities of the same class shall be
listed on such national securities exchange or quotation system by the Company.

9. Restrictions on Transfer.Transfer.

9.1 Restrictive  Legends.  Except as otherwise permitted by this section 9, each
Warrant  (including  each Warrant issued upon the transfer of any Warrant) shall
be stamped or otherwise  imprinted with a legend in substantially  the following
form:

"THE WARRANT  REPRESENTED BY THIS CERTIFICATE (AND THE SHARES OF COMMON STOCK OR
OTHER  SECURITIES  ISSUABLE  UPON  EXERCISE  OF  SUCH  WARRANT)  HAVE  NOT  BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED,  OR THE SECURITIES LAWS
OF ANY STATE IN RELIANCE ON CERTAIN EXEMPTIONS FROM REGISTRATION THEREUNDER. THE
SALE,  PLEDGE,  HYPOTHECATION  OR OTHER  TRANSFER OF SUCH  WARRANT  (AND OF SUCH
SHARES OF COMMON  STOCK OR OTHER  SECURITIES)  IS  SUBJECT  TO  COMPLIANCE  WITH
APPLICABLE SECURITIES LAWS AND REGULATIONS."

Except as otherwise  permitted by this  section 9, each  certificate  for Common
Stock (or Other  Securities)  issued upon the exercise of any Warrant,  and each
certificate  issued  upon  the  transfer  of any such  Common  Stock  (or  Other
Securities),   shall  be  stamped  or  otherwise  imprinted  with  a  legend  in
substantially the following form:

"THE SHARES OF STOCK  REPRESENTED BY THIS  CERTIFICATE  HAVE NOT BEEN REGISTERED
UNDER THE  SECURITIES  ACT OF 1933, AS AMENDED,  OR THE  SECURITIES  LAWS OF ANY
STATE IN RELIANCE ON CERTAIN EXEMPTIONS FROM REGISTRATION THEREUNDER.  THE SALE,
PLEDGE,  HYPOTHECATION OR OTHER TRANSFER OF SUCH SHARES IS SUBJECT TO COMPLIANCE
WITH APPLICABLE SECURITIES LAWS AND REGULATIONS."

10.  Availability  of  Information.  The Company  shall  timely file the reports
required  to be  filed by it  under  the  Securities  Act and the  Exchange  Act
(including  but not  limited to the reports  under  sections 13 and 15(d) of the
Exchange  Act  referred  to in  subparagraph  (c) of  Rule  144  adopted  by the
Commission  under the Securities Act) and the rules and  regulations  adopted by
the  Commission  thereunder  (or,  if the  Company is not  required to file such
reports,  will, upon the request of any holder of Registrable  Securities,  make
publicly  available other  information) and will take such further action as any
holder of  Registrable  Securities  may  reasonably  request,  all to the extent
required from time to time to enable such holder to sell Registrable  Securities
without  registration  under the  Securities  Act within the  limitation  of the
exemptions  provided by (a) Rule 144 under the Securities  Act, as such Rule may
be amended from time to time,  or (b) any similar rule or  regulation  hereafter
adopted  by the  Commission.  Upon the  request  of any  holder  of  Registrable
Securities,  the Company will  deliver to such holder a written  statement as to
whether it has complied with the requirements of this section 10.

11.  Reservation  of Stock,  etc. The Company will at all times reserve and keep
available,  solely for issuance and delivery upon exercise of the Warrants,  the
number  of  shares of  Common  Stock  (or  Other  Securities)  from time to time
issuable  upon exercise of all Warrants at the time  outstanding.  All shares of
Common Stock (or Other Securities)  issuable upon exercise of any Warrants shall
be duly authorized and, when issued upon such exercise,  shall be validly issued
and, in the case of shares,  fully paid and  nonassessable  with no liability on
the part of the holders thereof.

12.  Registration and Transfer of Warrants, etc.nts, etc.

12.1  Warrant  Register;  Ownership  of  Warrants.  The Company will keep at its
principal  office  a  register  in  which  the  Company  will  provide  for  the
registration  of Warrants and the  registration  of  transfers of Warrants.  The
Company  may treat the Person in whose name any  Warrant is  registered  on such
register as the owner thereof for all other purposes,  and the Company shall not
be affected by any notice to the contrary,  except that, if and when any Warrant
is properly  assigned in blank,  the Company may (but shall not be obligated to)
treat the bearer thereof as the owner of such Warrant for all purposes.  Subject
to section 9, a Warrant, if properly assigned,  may be exercised by a new holder
without a new Warrant first having been issued.

12.2  Transfer  and  Exchange of  Warrants.  Upon  surrender  of any Warrant for
registration of transfer or for exchange to the Company at its principal office,
the  Company at its  expense  will  (subject to  compliance  with  section 9, if
applicable)  execute and deliver in exchange  therefor a new Warrant or Warrants
of like tenor,  in the name of such holder or as such  holder  (upon  payment by
such  holder of any  applicable  transfer  taxes)  may  direct,  calling  in the
aggregate on the face or faces  thereof for the number of shares of Common Stock
called for on the face or faces of the Warrant or Warrants so surrendered.

12.3 Replacement of Warrants.  Upon receipt of evidence reasonably  satisfactory
to the Company of the loss, theft, destruction or mutilation of any Warrant and,
in the case of any such loss, theft or destruction of any Warrant, upon delivery
of an indemnity bond in such reasonable  amount as the Company may determine or,
in the case of any such  mutilation,  upon the  surrender  of such  Warrant  for
cancellation to the Company at its principal office,  the Company at its expense
will execute and deliver, in lieu thereof, a new Warrant of like tenor.

13. Registration  Rights. The Purchaser or any assignee of this Warrant shall be
entitled to all rights and benefits  regarding the  registration of Common Stock
and Registrable Securities set forth in the Registration Rights Agreement.

14.  Definitions.  As used herein,  unless the context otherwise  requires,  the
following terms have the following respective meanings:

     Additional Shares of Common Stock: All shares  (including  treasury shares)
of Common Stock issued or sold (or, pursuant to section 2.3 or 2.4, deemed to be
issued)  by the  Company  after the date  hereof,  whether  or not  subsequently
reacquired or retired by the Company, other than

     (a) Series B and Series D Preferred Stock;

     (b) shares issued upon the exercise of the common stock  purchase  warrants
and  non-qualified  options  listed in Exhibit 14(b)  hereto,  providing for the
purchase of an  aggregate  of  2,604,114  shares of Common  Stock  (based on the
current capitalization of the Company);

     (c) shares issued upon the exercise of this Warrant,

     (d) not to exceed 2,750,000 shares (subject to equitable  adjustment in the
event  of  any   combination,   reclassification,   stock  split,   dividend  or
recapitalization  of the Company) issued upon the exercise of options granted or
to be granted  under the  Company's  stock option plans as in effect on the date
hereof or under any other employee stock option,  compensation  or purchase plan
or plans adopted or assumed after such date,

     (e) such  additional  number  of  shares as may  become  issuable  upon the
exercise  of any of the  securities  referred  to in the  foregoing  clauses (a)
through  (d)  by  reason  of  adjustments  required  pursuant  to  anti-dilution
provisions  applicable to such  securities as in effect on the date hereof,  but
only if and to the extent that such  adjustments  are  required as the result of
the original issuance of the Warrants, and

     (f) such  additional  number  of  shares as may  become  issuable  upon the
exercise or  conversion  of any of the  securities  referred to in the foregoing
clauses  (a)  through  (e)  by  reason  of  adjustments   required  pursuant  to
anti-dilution  provisions applicable to such securities as in effect on the date
hereof,  in order to reflect any  subdivision or combination of Common Stock, by
reclassification or otherwise, or any dividend on Common Stock payable in Common
Stock.

     Business  Day:  Any day other than a Saturday or a Sunday or a day on which
commercial banking institutions in the City of New York are authorized by law to
be closed.  Any reference to "days" (unless  Business Days are specified)  shall
mean calendar days.

     Commission:  The  Securities  and Exchange  Commission or any other federal
agency at the time administering the Securities Act.

     Common Stock: As defined in the introduction to this Warrant,  such term to
include  any stock into which such Common  Stock shall have been  changed or any
stock resulting from any  reclassification  of such Common Stock,  and all other
stock of any class or classes (however designated) of the Company the holders of
which have the right,  without  limitation  as to amount,  either to all or to a
share of the balance of current  dividends and  liquidating  dividends after the
payment of dividends and distributions on any shares entitled to preference.

     Company:  As  defined in the  introduction  to this  Warrant,  such term to
include any corporation  which shall succeed to or assume the obligations of the
Company hereunder in compliance with section 3.

     Convertible  Securities:  Any  evidences of  indebtedness,  shares of stock
(other than Common Stock) or other securities directly or indirectly convertible
into or exchangeable for Additional Shares of Common Stock.

     Current  Market  Price:  On any date  specified  herein,  the average daily
Market Price during the period of the most recent 20 days,  ending on such date,
on which the national securities exchanges were open for trading, except that if
no Common Stock is then listed or admitted to trading on any national securities
exchange or quoted in the  over-the-counter  market,  the Current  Market  Price
shall be the Market Price on such date.

     Exchange Act: The Securities  Exchange Act of 1934, or any similar  federal
statute, and the rules and regulations of the Commission thereunder,  all as the
same shall be in effect at the time.

     Market Price:  On any date  specified  herein,  the amount per share of the
Common  Stock,  equal to (a) the last sale price of such Common  Stock,  regular
way, on such date or, if no such sale takes  place on such date,  the average of
the  closing  bid and  asked  prices  thereof  on  such  date,  in each  case as
officially  reported on the principal national securities exchange on which such
Common Stock is then listed or admitted to trading,  or (b) if such Common Stock
is not then listed or admitted to trading on any  national  securities  exchange
but is designated as a national  market  system  security by the NASD,  the last
trading  price of the Common Stock on such date, or (c) if there shall have been
no trading on such date or if the Common Stock is not so designated, the average
of the closing bid and asked prices of the Common Stock on such date as shown by
the NASD  automated  quotation  system,  or (d) if such Common Stock is not then
listed  or  admitted  to  trading  on any  national  exchange  or  quoted in the
over-the-counter market, the value as determined by a firm of independent public
accountants  of  recognized  standing  selected by the Board of Directors of the
Company,  and approved by TSA, as of the last day of any month ending  within 30
days preceding the date as of which the determination is to be made.

     NASD: The National Association of Securities Dealers, Inc.

     Options:  Rights,  options  or  warrants  to  subscribe  for,  purchase  or
otherwise  acquire  either  Additional  Shares  of Common  Stock or  Convertible
Securities.

     Other Securities:  Any stock (other than Common Stock) and other securities
of the Company or any other Person (corporate or otherwise) which the holders of
the Warrants at any time shall be entitled to receive,  or shall have  received,
upon the exercise of the Warrants, in lieu of or in addition to Common Stock, or
which at any time shall be issuable or shall have been issued in exchange for or
in  replacement  of Common  Stock or Other  Securities  pursuant to section 3 or
otherwise.

     Person: A corporation,  an association, a partnership,  an organization,  a
business,  an  individual,  a government or political  subdivision  thereof or a
governmental agency.

     Registrable Securities:  As defined in Section 3 of the Registration Rights
Agreement.

     Registration  Rights Agreement:  The Registration Rights Agreement dated as
of the date hereof,  substantially  in the form of Exhibit IV to the  Securities
Purchase Agreement.

     Securities Act: The Securities Act of 1933, or any similar federal statute,
and the rules and  regulations  of the  Commission  thereunder,  all as the same
shall be in effect at the time.

     Securities Purchase Agreement: The Securities Purchase Agreement,  dated as
of the date hereof, by and between TSA and the Company.

     Transfer:  Any  sale,  assignment,  pledge  or  other  disposition  of  any
security,  or of any interest  therein,  which could constitute a "sale" as that
term is defined in section 2(3) of the Securities Act.

     TSA: As defined in section 1, and its successors and assigns.

     Warrant Price: As defined in section 2.1.

15. Remedies.  The Company  stipulates that the remedies at law of the holder of
this Warrant in the event of any default or threatened default by the Company in
the  performance of or compliance  with any of the terms of this Warrant are not
and will not be adequate and that, to the fullest extent  permitted by law, such
terms may be specifically  enforced by a decree for the specific  performance of
any agreement contained herein or by an injunction against a violation of any of
the terms hereof or otherwise.

16. No Rights or Liabilities as Stockholder.  Nothing  contained in this Warrant
shall be  construed  as  conferring  upon the  holder  hereof  any  rights  as a
stockholder  of the  Company or as  imposing  any  obligation  on such holder to
purchase  any  securities  or as imposing  any  liabilities  on such holder as a
stockholder of the Company,  whether such obligation or liabilities are asserted
by the Company or by creditors of the Company.

17. Notices. All notices and other communications under this Warrant shall be in
writing and shall be  delivered,  or mailed by  registered  or  certified  mail,
return receipt requested, by a nationally recognized overnight courier,  postage
prepaid,addressed (a) if to any holder of any Warrant, at the registered address
of such holder as set forth in the register kept at the principal  office of the
Company,  or (b) if to the Company,  to the  attention  of its  President at its
principal  office,  provided that the exercise of any Warrant shall be effective
in the manner provided in section 1.

18.  Amendments.  This  Warrant  and any term  hereof  may be  changed,  waived,
discharged  or terminated  only by an instrument in writing  signed by the party
against which  enforcement of such change,  waiver,  discharge or termination is
sought.

19.  Expiration.  The Company will give the holder of this Warrant not less than
six weeks nor more than twelve  weeks notice of the  expiration  of the right to
exercise this  Warrant.  The right to exercise this Warrant shall expire at 5:00
p.m.,  New York City time,  on March 1, 2002,  unless the Company  shall fail to
give such notice as aforesaid, in which event the right to exercise this Warrant
shall  not  expire  until a date six weeks  after the date on which the  Company
shall give the holder hereof  notice of the  expiration of the right to exercise
this Warrant.

20.  Descriptive  Headings.  The headings in this  Agreement are for purposes of
reference only and shall not limit or otherwise affect the meaning hereof.

21.  GOVERNING  LAW.  THIS WARRANT SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE
WITH,  AND THE RIGHTS OF THE PARTIES  SHALL BE GOVERNED BY, THE LAW OF THE STATE
OF DELAWARE, WITHOUT REGARD TO PRINCIPLES OF CONFLICT OF LAWS.

22.  Judicial  Proceedings;  Waiver of Jury.  Any  judicial  proceeding  brought
against the Company  with respect to this Warrant may be brought in any court of
competent  jurisdiction  in the  State of New York or of the  United  States  of
America for the Southern  District of New York and, by execution and delivery of
this  Agreement,  the Company (a) accepts,  generally and  unconditionally,  the
nonexclusive  jurisdiction of such courts and any related  appellate  court, and
irrevocably  agrees to be bound by any judgment  rendered  thereby in connection
with this  Warrant,subject  to any rights of appeal,  and (b) irrevocably waives
any objection the Company may now or hereafter  have as to the venue of any such
suit,  action or  proceeding  brought  in such a court or that such  court is an
inconvenient  forum.  The Company hereby waives personal  service of process and
consents, that service of process upon it may be made by certified or registered
mail,  return  receipt  requested,  at its address  specified or  determined  in
accordance  with the  provisions  of section  17,  and  service so made shall be
deemed  completed  on the third  Business Day after such service is deposited in
the mail or, if earlier,  when delivered.  Nothing herein shall affect the right
to serve  process in any other manner  permitted by law or shall limit the right
of any holder of any  Warrant to bring  proceedings  against  the Company in the
courts of any other jurisdiction. THE COMPANY HEREBY WAIVES TRIAL BY JURY IN ANY
JUDICIAL  PROCEEDING  INVOLVING,  DIRECTLY,  OR INDIRECTLY,  ANY MATTER (WHETHER
SOUNDING IN TORT,  CONTRACT OR OTHERWISE) IN ANY WAY ARISING OUT OF, RELATED TO,
OR CONNECTED WITH THIS WARRANT OR THE RELATIONSHIP ESTABLISHED HEREUNDER.

                                  NESTOR, INC.



                                  By:  Nigel Hebborn
                                      -----------------------------------------
                                  Title:  Chief Financial Officer
                                        --------------------------------------


                                 LOAN AGREEMENT


     THIS LOAN  AGREEMENT  (the  Agreement)  is made and dated  this 25th day of
March, 1998, by and between Transaction Systems Architects, Inc. ("TSA") or (the
"Lender"),  a  Delaware  corporation,   and  Nestor,  Inc.  ("Nestor")  or  (the
"Borrower"), a Delaware corporation.

                                    RECITALS

     A.  Nestor  has  requested  the  Lender to extend  credit to Nestor and the
Lender has agreed to do so.

     B. Nestor and the Lender  desire to set forth  herein the  mutually  agreed
upon terms and conditions of such credit extension.

     NOW,  THEREFORE,  in consideration of the above Recitals and for other good
and  valuable  consideration,  the  receipt  and  adequacy  of which are  hereby
acknowledged, the parties hereto hereby agree as follows:

                                    AGREEMENT

1. Term Loan

     A. Term Loan. On the terms and subject to the  conditions set forth herein,
the Lender agrees that it shall,  on and after March 25, 1998,  make a loan (the
"Term Loan") to Nestor in the amount up to One Million Five Hundred Thousand and
00/100 Dollars ($1,500,000) (the "Term Loan").

     B. Advances. Advances in integrals of $100,000.00 will be made upon written
request of Nestor. Such advances will be made one (1) Business Day following the
date the request is received and shall be made by wire transfer .

     C.  Calculation of Interest.  Nestor shall pay interest on the  outstanding
principal  balance of the Term Loan from the date disbursed to but not including
the date of  payment at a rate per annum  equal to the prime  rate as  published
from time-to-time in the Wall Street Journal (the "Applicable Prime Rate").

     D. Payment of Interest. Interest accruing on the Term Loan shall be payable
quarterly,  in arrears for each quarter on or before the tenth  (10th)  Business
Day of the next  succeeding  calendar  quarter  in the  amount  set  forth in an
interest billing  delivered by the Lender to Nestor on or before the fifth (5th)
Business Day of such quarter.

     E. Repayment of Principal.  The Term Loan may be repaid,  in the discretion
of Nestor,  from time to time, but in any event shall be repaid in full on March
31, 1999.

     F. Collateralization.  The Term Loan shall be collateralized by current and
future  royalties due Nestor from Lender or its subsidiaries  under  distributer
agreement(s).  The amount of royalties used to collateralize the Term Loan shall
be equal to the total amount of the outstanding principal and interest.


2. Additional Provisions

     A. Use of  Proceeds.  The  proceeds  of the Term Loan shall be  utilized by
Nestor for purchase of capital assets and to meet working  capital  requirements
in the ordinary course of Nestor's business.

     B. Note.  The  obligation  of the  Borrower to repay the Term Loan shall be
evidenced  by a Note  payable  to the  order of the  Lender  in the form of that
attached hereto as Exhibit 2B (the Note).

     C. Nature and Place of Payments. All payments made on account shall be made
by Nestor, without setoff or counterclaim,  in lawful money of the United States
in immediately  available funds, free and clear of and without deduction for any
taxes,  fees,  or other charges of any nature  whatsoever  imposed by any taxing
authority  and must be received by the Lender by 10:00 a.m.  central time on the
day of payment,  it being  expressly  agreed and understood that if a payment is
received  after 10:00 a.m.  central  time by the Lender,  such  payment  will be
considered to have been made by Nestor on the next  succeeding  Business Day and
interest  thereon shall be payable by Nestor at the Applicable Prime Rate during
such extension.  All payments on account of the Obligations shall be made to the
Lender through its office located at Transaction Systems  Architects,  Inc., 330
South 108th Avenue, Omaha, Nebraska 68154. If any payment required to be made by
Nestor  hereunder  becomes due and payable on a day other than a Business  Day ,
then interest  thereon shall be payable at the then  applicable rate during such
extension.

     D.  Postmaturity  Interest.  Any  Obligations not paid when due (whether at
stated  maturity,  upon  acceleration or otherwise) shall bear interest from the
date due until paid in full at a per annum rate equal to two percent  (2%) above
the Applicable Prime Rate.

     E.  Computations.  All computations of interest and fees payable  hereunder
shall be based upon a year  deemed to consist of 360 days for the actual  number
of days elapsed.


     F. Prepayments.

          i.  Nestor may  prepay the Term Loan,  in whole at any time or in part
     from time to time,  upon not less than one  Business  Day's  prior  written
     notice  to the  Lender.  Principal  amounts  prepaid  shall be  applied  to
     installments on the Term Loan in the order of their maturity.

          ii. Nestor shall pay in connection  with any prepayment  hereunder all
     interest accrued but unpaid on the Term Loan  concurrently  with payment to
     the Lender of any principal amounts.

3. Conditions to Making Term Loan

As conditions  precedent to the  obligation of the Lender to make the Term Loan,
including each Advance:

     A.  Delivery of  Documents.  Nestor shall have  delivered or shall have had
delivered to the Lender,  in form and substance  satisfactory  to the Lender and
its counsel, each of the following:

          i. A duly executed copy of this Agreement;

          ii. A duly executed copy of the other Loan Documents;

          iii. Such credit applications,  financial statements,  authorizations,
     and such  information  concerning  Nestor and its business,  operations and
     condition (financial and otherwise) as the Lender may reasonably request;

          iv.  Copies  of  resolutions  of the  Board  of  Directors  of  Nestor
     approving the execution and delivery of the Loan Documents certified by the
     Secretary of Nestor as of the date of this Agreement;

          v. A certificate  of the Secretary of Nestor  certifying the names and
     true  signatures  of the  officers  of Nestor  authorized  to sign the Loan
     Documents;

          vi. A copy of the Certificate of Incorporation of Nestor, certified by
     the Secretary of State of Delaware as of a recent date;

          vii. A copy of each of the Certificate of Incorporation  and Bylaws of
     Nestor,  certified by the Secretary or an Assistant  Secretary of Nestor as
     of the date of this Agreement as being accurate and complete;

          viii. A  certificate  of good standing of Nestor from the Secretary of
     State of Delaware as of a recent date;

          ix.  Certificates  of authority  and good  standing of Nestor for each
     state in which Nestor is qualified to do business; and

          x. A  certificate  of the  president  and chief  financial  officer or
     treasurer of Nestor certifying that the  Representations  and Warranties of
     Nestor  set  forth  in  Section  7 are true and  accurate  in all  material
     respects as of the date of this Agreement.

          Provided,  however,  that any document not  delivered at or before the
     initial  Advance  after  execution  of this  Agreement  with the consent of
     Lender shall be provided within thirty (30) days.

     B. Approvals. All acts and conditions (including,  without limitation,  the
obtaining of any necessary  regulatory  approvals and the making of any required
filings,  recordings, or registrations) required to be done and performed and to
have happened  precedent to the execution,  delivery and performance of the Loan
Documents  and to constitute  the same legal,  valid,  and binding  obligations,
enforceable in accordance with their respective terms,  shall have been done and
performed  and  shall  have  happened  in due and  strict  compliance  with  all
applicable laws.

     C.  Documentation  Acceptable.   All  documentation,   including,   without
limitation, documentation for corporate and legal proceedings in connection with
the  transactions  contemplated  by the Loan Documents  shall be satisfactory in
form and substance to the Lender.

     D.  Representations  and Warranties.  The representations and warranties of
Nestor  contained  in the Loan  Documents  shall be accurate and complete in all
respects as if made on and as of each funding date for the Term Loan.

     E. Existence of Defaults. There shall not have occurred an Event of Default
or Potential Default that is continuing unwaived.


4. Representations and Warranties of Nestor

     As an  inducement  to the Lender to enter into this  Agreement  and to make
Loans as provided herein, Nestor represents and warrants to the Lender that:

     A. No Change.  There has been no material  adverse  change in the business,
operations,  assets,  or financial or other condition of Nestor taken as a whole
since the financial statements furnished to Lender by Nestor covering the period
ended December 31, 1997,  and, except as set forth in Exhibit 4A (Material Lease
Schedule) Nestor has not entered into, incurred,  or assumed any long-term debt,
mortgages,  material  leases or oral or written  commitments,  nor commenced any
significant  project,  nor made any purchase or acquisition  of any  significant
property.

     B. Corporate Existence;  Compliance with Law. Nestor (i) is duly organized,
validly  existing,  and in good standing as a corporation  under the laws of the
State of Delaware and is qualified to do business in each jurisdiction where its
ownership of property or conduct of business  requires  such  qualification  and
where failure to qualify would have a material  adverse  effect on Nestor or its
property  and/or  business  or on the  ability of Nestor to pay or  perform  the
Obligations;  (ii) has the corporate  power and authority and the legal right to
own and operate its property  and to conduct  business in the manner in which it
does and proposed so to do; and (iii) is in compliance with all  Requirements of
Law.

     C. Corporate Power; Authorization;  Enforceable Obligations. Nestor has the
corporate  power and  authority  and the legal  right to execute,  deliver,  and
perform the Loan  Documents  to which it is a party and has taken all  necessary
corporate  action to authorize the  execution,  delivery and  performance of the
Loan  Documents.  The Loan  Documents  have been duly  executed and delivered on
behalf of Nestor and constitute legal,  valid. and binding obligations of Nestor
enforceable against Nestor in accordance with their respective terms, subject to
the effect of applicable  bankruptcy and other similar laws affecting the rights
of creditors generally and the effect of equitable principles whether applied in
an action at law or a suit in equity.

     D. No Legal  Bar.  The  execution,  delivery  and  performance  of the Loan
Documents, the borrowing hereunder and the use of the proceeds thereof, will not
violate any Requirement of Law or any Contractual Obligation of Nestor or create
or  result  in the  creation  of any Lien on any  assets  of  Nestor,  except as
pursuant to the Security Agreement.

     E. No Material  Litigation.  Except as disclosed  on Exhibit 4E hereto,  no
litigation,  investigation,  or  proceeding  of  or  before  any  arbitrator  or
Governmental Authority is pending or, to the knowledge of Nestor,  threatened by
or against  Nestor or against any of Nestor's  properties  or revenues  which is
likely to be adversely determined and which, if adversely determined,  is likely
to have a material  adverse  effect on the business,  operations,  property,  or
financial or other condition of Nestor.

     F. Taxes.  Nestor has filed or caused to be filed all tax returns  that are
required  to be filed and has paid all taxes shown to be due and payable on said
returns or on any assessments  made against it or any of its property other than
taxes that are being  contested in good faith by appropriate  proceedings and as
to which Nestor has established adequate reserves in conformity with GAAP.

     G.  Investment  Borrower Act.  Nestor is not an  "investment  company" or a
company  "controlled"  by an  "investment  company"  within  the  meaning of the
Investment Borrower Act of 1940, as amended.

     H. Federal  Reserve  Board  Regulations.  Nestor is not engaged or will not
engage,  principally or as one of its important  activities,  in the business of
extending  credit for the  purpose of  "purchasing"  or  "carrying"  any "margin
stock" within the respective  meanings of such terms under Regulation U. No part
of the proceeds of any Loan issued  hereunder will be used for  "purchasing"  or
"carrying"  "margin  stock" as so defined or for any purpose that  violates,  or
that would be inconsistent  with, the provisions of the Regulations of the Board
of Governors of the Federal Reserve System.

     I. ERISA. (i) No Prohibited Transactions, Accumulated Funding Deficiencies,
withdrawals from  Multiemployer  Plans, or Reportable  Events have occurred with
respect  to any Plans or  Multiemployer  Plans  that,  in the  aggregate,  could
subject Nestor to any tax, penalty,  or other liability where such tax, penalty,
or liability is not covered in full,  for the benefit of Nestor,  by  insurance;
(ii) no notice of intent to  terminate a Plan has been  filed,  nor has any Plan
been  terminated  under  Section  4041 of  ERISA,  nor has the  PBGC  instituted
proceedings  to  terminate,  or appoint a trustee to  administer a Plan,  and no
event has  occurred or  condition  exists that might  constitute  grounds  under
Section 4042 of ERISA for the  termination of or the appointment of a trustee to
administer  any Plan;  (iii) the present  value of all benefit  liabilities  (as
defined in Section 4001(a)(16) of ERISA) under all Plans (based on the actuarial
assumptions used to fund the Plans) does not exceed the assets of the Plans; and
(iv) the execution,  delivery,  and  performance by Nestor of this Agreement and
the Loans  hereunder  and the use of the  proceeds  thereof will not involve any
Prohibited Transactions.


     J. Assets. Nestor has good and marketable title to all property and assets,
except property and assets sold or otherwise  disposed of in the ordinary course
of business  subsequent to the respective dates thereof.  Except as set forth in
Exhibit  4J  (Lien  Schedule)  Nestor  has no  outstanding  Liens  on any of its
properties or assets nor are there any security  agreements to which Nestor is a
party,  or  title  retention  agreements,  whether  in the  form  of  leases  or
otherwise,  of any personal  property  except as permitted  under Paragraph 6(A)
below.

     K. Securities Acts.  Nestor has not issued any  unregistered  securities in
violation of the registration requirements of Section 5 of the Securities Act of
1933, as amended, or any other law, and is not violating any rule, regulation or
requirement under the Securities Act of 1933, as amended,  or the Securities and
Exchange Act of 1934, as amended. Nestor is not required to qualify an indenture
under the Trust  Indenture  Act of 1939,  as  amended,  in  connection  with its
execution and delivery of the Note.

     L. Consents, etc. No consent, approval,  authorization of, or registration,
declaration or filing with any governmental authority is required on the part of
Nestor in connection  with the  execution and delivery of the Loan  Documents or
the  performance  of or compliance  with the terms,  provisions,  and conditions
hereof or thereof.


5. Affirmative Covenants

     Nestor  hereby  covenants  and agrees with the Lender that,  as long as any
Obligations remain unpaid, Nestor shall:

     A. Financial Statements. Furnish or cause to be furnished to the Lender:

          i.  Within  ninety  (90) days after the last day of the fiscal year of
     Nestor  ending  on  December  31,  1998 and each  fiscal  year  thereafter,
     consolidated  and  consolidating  statements  of income and  statements  of
     changes in financial  position  for such year and balance  sheets as of the
     end of such )tar presented fairly in accordance with GAAP and, if requested
     by Lender,  accompanied by an  unqualified  report of a firm of independent
     certified  public  accountants  acceptable  to  the  Lender  and  including
     therewith  a copy of the  management  letter  from  such  certified  public
     accountants,  except  that a  qualification  as to the ability of Nestor to
     remain a going concern may be made;

          ii.  Within  forty-five  (45) days  after the last day of each  fiscal
     quarter,  statements  of income and changes in financial  position for such
     fiscal  quarter and balance  sheets as of the end of such fiscal quarter of
     Nestor,  accompanied in each case by a certificate  of the chief  financial
     officer of Nestor  stating that such  financial  statements  are  presented
     fairly in accordance with GAAP.

     B.  Certificates;  Reports;  Other  Information.  Furnish  or  cause  to be
furnished to the Lender

          i. Promptly after sending,  filing,  or publishing the same, copies of
     all proxy statements,  financial statements,  and reports that Nestor sends
     to its public stockholders,  if any, and copies of all regular and periodic
     reports  and  all  registration  statements  that  Nestor  files  with  the
     Securities and Exchange  Commission and copies of all press releases issued
     by Nestor;

          ii. Within  thirty (30) days after the end of each of Nestor's  fiscal
     years,  a copy of Nestor's  business plan with  financial  projections  for
     operations  for the next fiscal year,  such  projections  to be in form and
     detail satisfactory to the Lender;

          iii.  Not  later  than  forty-five  (45)  days  after  the end of each
     quarter,  a  certificate  of the chief  financial  officer or  treasurer of
     Nestor  stating he has no  knowledge  that an Event of Default or Potential
     Default  has  occurred  and is  continuing  or, if an Event of  Default  or
     Potential  Default has  occurred and is  continuing,  a statement as to the
     nature  thereof and the action that  Nestor  proposes to take with  respect
     thereto.

     C. Payment of  Indebtedness.  Pay,  discharge,  or otherwise  satisfy at or
before maturity or before it becomes delinquent,  defaulted, or accelerated,  as
the case may be, all its Indebtedness  (including  taxes),  except  Indebtedness
being  contested  in  good  faith  and  for  which  provision  is  made  to  the
satisfaction  of the Lender for the payment thereof in the event Nestor is found
to be obligated to pay such  Indebtedness  and which  Indebtedness  is thereupon
promptly paid by Nestor.


     D.  Maintenance  of  Existence  and  Properties;  Compliance.  Maintain its
corporate existence and maintain all rights,  privileges,  licenses,  approvals,
franchises,  properties, and assets necessary or desirable in the normal conduct
of its business, and comply with all Requirements of Law.

     E.  Inspection  of Property;  Books and Records;  Discussions.  Keep proper
books of record  and  account  in which  full,  true,  and  correct  entries  in
conformity  with GAAP and all  Requirements of Law shall be made of all dealings
and  transactions  in  relation  to its  business  and  activities,  and  permit
representatives  of the Lender (at no cost or  expense  to Nestor  unless  there
shall have  occurred and be continuing an Event of Default) to visit and inspect
any of its properties and examine and , make abstracts from and copies of any of
its books and records at any  reasonable  time and as often as may reasonably be
desired by the Lender, and to discuss the business, operations,  properties, and
financial and other  conditions of Nestor with officers and employees of Nestor,
and with their independent certified public accountants.

     F. Notices. Promptly give written notice to the Lender of.

          i. The occurrence of any Potential Default or Event of Default;

          ii. Any  litigation or proceeding  affecting  Nestor that could have a
     material adverse effect on the business, operations, property, or financial
     or other condition of Nestor; and

          iii. A material adverse change in the business, operations,  property,
     or financial or other condition of Nestor.

     G. Expenses. Pay all reasonable  out-of-pocket expenses (including fees and
disbursements  of counsel) of the Lender  incident to the enforcement of payment
of the Obligations,  whether by judicial proceedings or otherwise, and before as
well as  after  judgment  including,  without  limitation,  in  connection  with
bankruptcy,  insolvency,  liquidation,  reorganization,   moratorium,  or  other
similar proceedings involving Nestor or a "workout" of the Obligations.

     H. Loan Documents.  Comply with and observe all terms and conditions of the
Loan Documents.

     I. Insurance.  Obtain and maintain insurance with responsible  companies in
such  amounts and  against  such risks as are  usually  carried by  corporations
engaged in similar  businesses  similarly  situated,  and  furnish the Lender on
request full information as to all such insurance.


     J. ERISA. Furnish to the Lender:

          i.  Promptly and in any event within 10 days after Nestor knows or has
     reason to know of the  occurrence  of a Reportable  Event with respect to a
     Plan with regard to which  notice  must be provided to the PBGC,  a copy of
     such  materials  required  to be filed  with the PBGC with  respect to such
     Reportable  Event and in each such case a statement of the chief  financial
     officer of Nestor setting forth details as to such Reportable Event and the
     action that Nestor proposes to take with respect thereto;

          ii. Promptly and in any event within 10 days after Nestor knows or has
     reason  to know of any  condition  existing  with  respect  to a Plan  that
     presents a  material  risk of  termination  of the Plan,  imposition  of an
     excise tax,  requirement  to provide  security to the Plan or incurrence of
     other liability by Nestor or any ERISA Affiliate,  a statement of the chief
     financial officer of Nestor describing such condition;

          iii.  At  least  ten  (10)  days  prior  to the  filing  by  any  plan
     administrator  of a Plan of a notice of intent to  terminate  such Plan,  a
     copy of such notice;

          iv.  Promptly and in no event more than ten (10) days after the filing
     thereof with the Secretary of the Treasury,  a copy of any  application  by
     Nestor or an ERISA Affiliate for a waiver of the minimum  funding  standard
     under Section 412 of the Code;

          v.  Promptly  and in no event more than ten (10) days after the filing
     thereof with the Internal  Revenue  Service,  copies of each annual  report
     that is filed on Form 5500,  together with certified  financial  statements
     for the Plan (if any) as of the end of such year and  actuarial  statements
     on Schedule B to such Form 5500;

          vi. Promptly and in any event with ten (10) days after it knows or has
     reason to know of any event or  condition  that  might  constitute  grounds
     under Section 4042 of ERISA for the termination of, or the appointment of a
     trustee to administer, any Plan, a statement of the chief financial officer
     of Nestor describing such event or condition;

          vii.  Promptly  and in no event more than ten (10) days after  receipt
     thereof by Nestor or any ERISA Affiliate, a copy of each notice received by
     Nestor or an ERISA  Affiliate  concerning  the imposition of any withdrawal
     liability under Section 4202 of ERISA; and

          viii.  Promptly  after receipt  thereof a copy of any notice Nestor or
     any ERISA  Affiliate  may  receive  from the PBGC or the  Internal  Revenue
     Service with respect to any Plan or Multiemployer Plan; provided,  however,
     that  this  subparagraph  (viii)  shall  not apply to  notices  of  general
     application promulgated by the PBGC or the Internal Revenue Service.

6. Negative Covenants

     Nestor hereby agrees that, as long as any Obligations remain unpaid, Nestor
shall not, without the written consent of Lender, directly or indirectly:

          A. Liens. Create,  incur, assume or suffer to exist, any Lien upon any
     of its property and assets except:

               i. Liens or charges  for  current  taxes,  assessments,  or other
          governmental  charges that are not  delinquent or that remain  payable
          without penalty,  or the validity of which are contested in good faith
          by appropriate  proceedings  upon stay of execution of the enforcement
          thereof,  provided  Nestor shall have set aside on its books and shall
          maintain  adequate reserves for the payment of same in conformity with
          GAAP;

               ii.  Liens,   deposits,  or  pledges  made  to  secure  statutory
          obligations,  surety,  or appeal  bonds,  or bonds for the  release of
          attachments or for stay of execution,  or to secure the performance of
          bids,  tenders,  contracts  (other  than for the  payment of  borrowed
          money), leases, or for purposes of like general nature in the ordinary
          course of Nestor's business;

               iii.  Purchase  money security  interests for property  hereafter
          acquired,  conditional  sale  agreements,  or  other  title  retention
          agreements,  with respect to property  hereafter  acquired;  provided,
          however,  that no such security  interest or agreement shall extend to
          any property other than the property acquired; and

               iv. Liens  securing  Permitted  Secured Debt as listed on Exhibit
          6A(iv) (Permitted Liens).

          B.  Indebtedness.  Create,  incur,  assume,  or suffer  to  exist,  or
     otherwise  become or be liable,  or cause any Subsidiary to create,  incur,
     assume, or suffer to exist, or otherwise become or be liable, in respect of
     any indebtedness except:

               i. The Obligations.

               ii. Trade debt  incurred in the  ordinary  course of business and
          outstanding  less than  thirty (30) days after the same has become due
          and  payable  or which  is being  contested  in good  faith,  provided
          provision is made to the  satisfaction  of the Lender for the eventual
          payment  thereof  in the event it is found that such  contested  trade
          debt is payable by Nestor.

               iii.  Indebtedness  secured  by Liens  permitted  under  previous
          paragraph 6(A) except that Nestor shall not draw  additional  advances
          under or from the  Revolving  Line of Credit with  Citizens Bank dated
          January 5, 1997 as amended by the Loan  Modification  Agreement  dated
          March  16,  1998 (the  "Citizens  LOC") or other  cause or permit  the
          principal  balance due  Citizens  Bank  pursuant to the  Citizens  LOC
          (excluding accruing interest charges) exceed $250,000; and

               iv.  Permitted  Secured Debt which shall consist of  Indebtedness
          secured by assets being  acquired  and/or  capital  lease  obligations
          either  of which  shall be  listed  on  Exhibit  6A(iv)  or  expressly
          approved in advance in writing by Lender.

               v.  Indebtedness  on terms and conditions  expressly  approved in
          advance in writing by Lender.

          C.  Consolidation and Merger.  Liquidate or dissolve or enter into any
     consolidation,  merger,  partnership,  joint venture,  syndicate,  or other
     combination.

          D.  Acquisitions.  Purchase  or  acquire  or incur  liability  for the
     purchase  or  acquisition  of any or all of the assets or  business  of any
     person,  firm, or corporation,  other than in the normal course of business
     as presently conducted.

          E.  Payment of  Dividends.  Except for  dividends  accruing  after the
     applicable  Restricted  Period  (as  defined  in  each  Preferred  Dividend
     Agreement) on preferred  stock on which Nestor is obligated to pay pursuant
     to the terms of the Preferred Dividend  Agreements made by and among Nestor
     and  certain  preferred  stockholders  dated prior to  December  31,  1997.
     Declare  or pay any  dividends  upon its  shares of stock now or  hereafter
     outstanding or make any distribution of assets to its stockholders as such,
     whether in cash,  property,  or  securities,  except  dividends  payable in
     shares  of  capital  stock  and  cash in lieu of  fractional  shares  or in
     options, warrants, or other rights to purchase shares of capital stock.

          F. Purchase or  Retirement of Stock.  Acquire,  purchase,  redeem,  or
     retire any shares of its capital stock now or hereafter outstanding, except
     on terms and conditions approved by Lender.

          G. Investments; Advances. Make or commit to make any advance, loan, or
     extension  of credit or capital  contribution  to, or  purchase  any stock,
     bonds,  notes,  debentures,  or other  securities  of,  or make  any  other
     investment in, any Person, except short-term cash management programs.

          H. Sale of Assets. Sell, lease, assign, transfer, or otherwise dispose
     of any of its assets  (other than obsolete or worn-out  property),  whether
     now owned or  hereafter  acquired,  other  than in the  ordinary  course of
     business as presently conducted and at fair market value.

          I. ERISA.

               i.  Terminate  or  withdraw  from any Plan so as to result in any
          material liability to the PBGC;

               ii.  Engage in or permit any  person to engage in any  Prohibited
          Transaction  involving  any Plan  that  would  subject  Nestor  to any
          material tax, penalty, or other liability;

               iii.  Incur or suffer to exist any material  Accumulated  Funding
          Deficiency, whether or not waived, involving any Plan;

               iv. Allow or suffer to exist any event or condition that presents
          a risk of incurring a material liability to the PBGC;

               v. Amend any Plan so as to require the posing of  security  under
          Section 401 (a)(29) of the Code; or


               vi. Fail to make payments  required  under Section  412(m) of the
          Code and  Section  302(e) of ERISA  that would  subject  Nestor to any
          material tax, penalty, or other liability.



7. Events of Default
     Upon the occurrence of any of the following events (an Event of Default):

     A. Nestor shall fail to pay any principal on the Loans on the date when due
or fail to pay within five days of the date when due any other  Obligation under
the Loan Documents; or

     B. Any representation or warranty made by Nestor in any Loan Document or in
connection  with any Loan  Document  shall be  inaccurate  or  incomplete in any
respect on or as of the date made; or

     C. Nestor shall fail to maintain its  corporate  existence or shall default
in the  observance  or  performance  of any covenant or  agreement  contained in
previous paragraphs 5(J) or 6; or

     D.  Nestor  shall fail to observe  or perform  any other term of  provision
contained in the Loan  Documents and such failure shall continue for thirty (30)
days; or

     E.  Nestor  shall  default in any payment of  principal  or interest on any
Indebtedness  (other than the  Obligations) or any other event shall occur,  the
effect of which is to permit such  Indebtedness  to be declared or  otherwise to
become due prior to its stated maturity; or

     F. (i) Nestor shall commence any case, proceeding or other action (A) under
any existing or future law of any jurisdiction, domestic or foreign, relating to
bankruptcy, insolvency, reorganization, or relief of debtors, seeking to have an
order for relief  entered  with  respect to it, or  seeking to  adjudicate  it a
bankrupt  or  insolvent,  or seeking  reorganization,  arrangement,  adjustment,
winding-up, liquidation,  dissolution, composition, or other relief with respect
to it  or  its  debts,  or  (B)  seeking  appointment  of a  receiver,  trustee,
custodian,  or other similar officials for it or for all or any substantial part
of its  assets,  or shall  make a  general  assignment  for the  benefit  of its
creditors;  or (ii) there shall be commenced against Nestor any case, proceeding
or other  action of a nature  referred  to  previously  in  clause  (i) that (A)
results  in the  entry of an  order  for  relief  or any  such  adjudication  or
appointment; (B) remains undismissed,  undischarged, or unbonded for a period of
sixty (60) days;  (iii) there shall be  commenced  against  Nestor or any of its
Subsidiaries, any case, proceeding or other action seeking issuance of a warrant
of  attachment,   execution,  distraint,  or  similar  process  against  all  or
substantially  all of its assets  that  results in the entry of an order for any
such relief that shall not have been vacated, discharged,  stayed, satisfied, or
bonded pending appeal within sixty (60) days from the entry thereof;  (iv) shall
take any action in furtherance  of, or indicating  its consent to,  approval of,
acquiescence in (other than in connection with a final  settlement),  any of the
acts set forth in  clause  (i),  (ii),  or (iii)  above;  or (v)  Nestor,  shall
generally not, or shall be unable to, or shall admit in writing its inability to
pay its debts as they become due; or

     G. (i) Any Reportable  Event or a Prohibited  Transaction  shall occur with
respect to any Plan;  (ii) a notice of intent to terminate a Plan under  Section
4041 of ERISA  shall be  filed;  (iii) a notice  shall be  received  by the plan
administrator of a Plan that the PBGC has instituted  proceedings to terminate a
Plan or  appoint  a  trustee  to  administer  a Plan;  (iv) any  other  event or
condition  shall  exist that might,  in the  opinion of the  Lender,  constitute
grounds under Section 4042 of ERISA for the  termination  of, or the appointment
of a trustee to administer, any Plan; or (v) Nestor or any ERISA Affiliate shall
withdraw  from  a  Multiemployer  Plan  under   circumstances  that  the  Lender
determines  could have a material  adverse effect on the financial  condition of
Nestor; or

     H. One or more judgments or decrees shall be entered against Nestor and all
such  judgments  or decrees  shall not have been  vacated,  discharged,  stayed,
satisfied,  or bonded  pending  appeal  within  fifteen (15) days from the entry
thereof or in any event  later than five days prior to the date of any  proposed
sale thereunder; or

     I. Nestor shall  voluntarily  suspend the  transaction of business for more
than five (5) days in any calendar year;

THEN,  automatically upon the occurrence of an Event of Default under above, and
at the option of the Lender upon the  occurrence  of any other Event of Default,
the  Lender's  obligation  to  make  Loans  hereunder  shall  terminate  and the
Obligations shall become due and payable,  without demand upon or presentment to
Nestor,  which are expressly  waived by Nestor,  and the Lender may  immediately
exercise all rights,  powers,  and remedies available to it at law, in equity or
otherwise.


8. Miscellaneous Provisions

     A. Confidentiality.  The parties agree to keep confidential the information
provided under the terms of this Agreement  subject to such disclosures as shall
be required by governmental authority or court order.

     B. No  Assignment.  Nestor may not assign its rights or  obligations  under
this Agreement  without the prior written consent of the Lender.  Subject to the
foregoing,  all  provisions  contained  in this  Agreement  or any  document  or
agreement  referred to herein or relating  hereto  shall inure to the benefit of
the Lender,  its successors and assigns,  and shall be binding upon Nestor,  its
successors and assigns.

     C.  Amendment,-  No Waiver.  This  Agreement may not be amended or terms or
provisions  hereof  waived  unless  such  amendment  or waiver is in writing and
signed by the Lender and Nestor.  It is expressly agreed and understood that the
failure  by the  Lender to elect to  accelerate  amounts  outstanding  hereunder
and/or to terminate the obligation of the Lender to make Loans  hereunder  shall
not  constitute  an  amendment  or  waiver  of any  term  or  provision  of this
Agreement.  No delay or failure by the Lender to exercise any right,  power,  or
remedy shall constitute a waiver thereof by the Lender, and no single or partial
exercise by the Lender of any right,  power,  or remedy shall  preclude other or
further  exercise  thereof  or any  exercise  of any other  rights,  powers,  or
remedies.

     D.  Cumulative  Rights.  The  rights,  powers,  and  remedies of the Lender
hereunder are  cumulative  and in addition to all rights,  powers,  and remedies
provided  under any and all agreements  between  Nestor and the Lender  relating
hereto, at law, in equity or otherwise.

     E. Entire  Agreement.  This  Agreement  and the  documents  and  agreements
referred to herein  embody the entire  agreement and  understanding  between the
parties hereto and supersede all prior agreements and understandings relating to
the subject matter hereof and thereof.

     F. Survival.  All representations,  warranties,  covenants,  and agreements
herein  contained on the part of Nestor shall  survive the  termination  of this
Agreement and shall be effective until the Obligations are paid and performed in
full or longer as expressly provided herein.

     G. Notices.  All notices,  consents,  requests,  and demands to or upon the
respective parties hereto shall be in writing,  and shall be deemed to have been
given or made when  delivered in person to those Persons listed on the signature
pages hereof or when deposited in the U.S.  mail,  postage  prepaid,  or, in the
case of telegraphic  notice or the overnight  courier services when delivered to
the telegraph company or overnight  courier service,  or in the case of telex or
telecopy notice, when sent, verification received, in each case addressed as set
forth on the signature  pages hereof,  or such other address as either party may
designate by notice to the other in accordance  with the terms of this paragraph
8(f).

     H.  Governing  Law.  This  Agreement  shall be governed by and construed in
accordance  with the laws of Nebraska,  without  giving  effect to choice of law
rules.

     I.  Counterparts.  This  Agreement  and the  other  Loan  Documents  may be
executed in any number of  counterparts,  all of which together shall constitute
one agreement.

     J. Accounting  Terms. All accounting terms not otherwise defined herein are
used with the meanings given such terms under GAAP.

9. Definitions

     For  purposes of this  Agreement,  the terms set forth below shall have the
following meanings:

     "Accumulated  Funding Deficiency" shall mean a funding deficiency described
in Section 302 of ERISA.

     "Affiliate"  shall  mean,  as to any  corporation,  any  other  corporation
directly or  indirectly  controlling,  controlled by or under direct or indirect
common control with, such corporation.  "Control" as used herein means the power
to direct the management and policies of such corporation.


     "Agreement"  shall  mean  this  Agreement,  as the  same  may  be  amended,
extended, or replaced from time to time.

     "Business Day" shall mean any day other than a Saturday, a Sunday, or a day
on which banks in Nebraska are  authorized  or obligated to close their  regular
banking business.

     "Code" shall mean the Internal  Revenue Code of 1986,  as amended,  and the
rules and regulations issued thereunder as form time to time in effect.

     "ERISA" shall mean the Employee  Retirement Income Security Act of 1974, as
amended, and the rules and regulations issued thereunder as from time to time in
effect.

     "ERISA  Affiliate"  shall mean each trade or  business,  including  Nestor,
whether or not  incorporated,  which  together with Nestor would be treated as a
single employer under Section 4001 of ERISA.

     "Event of  Default"  shall have the  meaning  given  such term in  previous
paragraph 7.

     "Final Maturity Date" shall mean the earlier of (a) September 30, 1999; and
(b) the  date the  Lender  accelerates  payment  of the Term  Loan  pursuant  to
previous paragraph 7.

     "GAAP" shall mean generally  accepted  accounting  principles in the United
States in effect from time to time.

     "Governmental Authority" shall mean any nation or government,  any state or
other  political  subdivision  thereof,  or  any  entity  exercising  executive,
legislative,  judicial, regulatory, or administrative functions of or pertaining
to government.

     "Indebtedness" of any Person shall mean all items of indebtedness which, in
accordance with GAAP and practices, would be included in determining liabilities
as shown on the liability  side of a statement of condition of such Person as of
the  date as of  which  indebtedness  is to be  determined,  including,  without
limitation,   all  obligations   for  money  borrowed  and   capitalized   lease
obligations,  and shall also include all  indebtedness and liabilities of others
assumed or  guaranteed  by such  Person or in  respect  of which such  Person is
secondarily or contingently  liable (other than by endorsement of instruments in
the course of  collection)  whether by reason of any  agreement  to acquire such
indebtedness or to supply or advance sums or otherwise.

     "Lien" shall mean any security interest,  mortgage,  pledge, lien, claim on
property,  charge, or encumbrance (including any conditional sale or other title
retention  agreement),  any lease in the  nature  thereof,  and the filing of or
agreement to give any financing  statement under the Uniform  Commercial Code of
any jurisdiction.

     "Loan  Documents"  shall  mean  this  Agreement,  the  Note,  the  Security
Agreement  in the form of Exhibit 9 and the  Options,  and each other  document,
instrument,   and  agreement  executed  by  Nestor  in  connection  herewith  or
therewith, as any of the same may be amended, extended, or replaced from time to
time.

     "Multiemployer  Plan" shall mean a Plan described in Section  4001(a)(3) of
ERISA to which Nestor or any ERISA Affiliate is required to contribute on behalf
of any of its employees.

     "Note" shall have the meaning previously given such term in paragraph 2(b).

     "Obligations" shall mean any and all debts, obligations, and liabilities of
Nestor to the Lender (whether principal,  interest, fees, or other-wise, whether
now existing or hereafter arising, whether voluntary or involuntary,  whether or
not  jointly  owed  with  others,  whether  direct  or  indirect,   absolute  or
contingent,  contractual  or tortious,  liquidated or  unliquidated,  arising by
operation  or law or  otherwise,  whether or not from time to time  decreased or
extinguished  and later  increased,  created,  or  incurred  and  whether or not
extended, modified, rearranged, restructured, refinanced, or replaced, including
without  limitation,  modifications  to interest rates or other payment terms of
such debts, obligations, or liabilities).

     "PBGC"  shall mean the Pension  Benefit  Guaranty  Corporation  established
pursuant to Subtitle A of Title IV of ERISA and any successor thereto.

     "Permitted  Secured  Debt"  shall  mean  that  indebtedness   described  in
paragraph 6(b)(iv) of this Agreement.

     "Person" shall mean any corporation,  natural person,  firm, joint venture,
partnership,  trust, unincorporated organization,  government, or any department
or agency of any government.

     "Plan"  shall mean any plan (other than a  Multiemployer  Plan)  subject to
Title IV of ERISA maintained for employees of Nestor or any ERISA Affiliate (and
any such plan no longer  maintained  for employees of Nestor or any of its ERISA
Affiliates  to  which  Nestor  or any of its  ERISA  Affiliates  has made or was
required to make any  contributions  during the five years preceding the date on
which such plan ceased to be maintained).

     "Potential  Default"  shall mean an event that but for the lapse of time or
the giving of notice, or both, would constitute an Event of Default.

     "Prime Rate" shall mean the  fluctuating per annum rate published from time
to time in the Wall Street Journal as the "Prime Rate".

     "Prohibited  Transaction"  shall mean any transaction  described in Section
406 of  ERISA  that is not  exempt  by  reason  of  Section  408 of ERISA or the
transitional  rules set  forth in  Section  414(c) of ERISA and any  transaction
described in Section  4975(c)(1)  of the Code,  which is not exempt by reason of
Section  4975(c)(2) or Section 4975(d) of the Code, or the transitional rules of
Section 2003(c) of ERISA.

     "Property"  shall  mean,  collectively  and  severally,  any and  all  real
property,  including all improvements and fixtures thereon, owned or occupied by
Nestor.

     "Reportable  Event"  shall  mean any of the  events  set  forth in  Section
4043(b)  of  ERISA  or the  regulations  thereunder,  a  withdrawal  from a Plan
described  in Section  4063 of ERISA,  a cessation  of  operations  described in
Section  4068(f) of ERISA, an amendment to a Plan  necessitating  the posting of
security  under  Section 401 (a)(29) of the Code, or a failure to make a payment
required by Section 412(m) of the Code and Section 302(e) of ERISA when due.

     "Requirements  of Law"  shall  mean as to any  Person  the  Certificate  of
Incorporation and Bylaws or other  organizational or governing documents of such
Person,  and any law,  treaty,  rule,  or  regulation,  or a final  and  binding
determination  of  an  arbitrator  or  a  determination  of  a  court  or  other
Governmental  Authority,  in each case applicable to or binding upon such Person
or any of its  property  or to  which  such  Person  or any of its  property  is
subject.


     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Agreement to be
executed as of the day and year first above written.


NESTOR, INC., a Delaware                  TRANSACTION SYSTEMS ARCHITECTS, INC.,
 Corporation                               a Delaware Corporation

By:  /s/ Nigel Hebborn                    By:  /s/ Gregory Duman
    -----------------------------            ---------------------------------

Title:  Chief Financial Officer          Title:  Chief Financial Officer        
       -------------------------                ------------------------------  


                      PRISM NON-EXCLUSIVE LICENSE AGREEMENT

     This agreement  ("Agreement") is made this 28 day of April 1998, by Nestor,
Inc., a Delaware corporation, having a place of business at One Richmond Square,
Providence,  RI 02906 ("Nestor"),  and Transaction Systems  Architects,  Inc., a
Nebraska corporation, having a place of business at 330 South 108 Avenue, Omaha,
NE 68154,  on behalf of itself and all of its  current  and future  Subsidiaries
(collectively  "TSA" and together with Nestor, the "Parties" and each singularly
a "Party"). A Wholly-owned  Subsidiary shall be any entity that is owned 100% by
TSA. A  Non-wholly-owned  Subsidiary  shall be any  entity  that is at least 50%
owned  by TSA but is not a  Wholly-owned  Subsidiary.  TSA and its  Subsidiaries
shall be jointly and severally liable hereunder.  A current list of Subsidiaries
is set forth on Schedule G. An updated Schedule G will be provided upon Nestor's
request. If during the term of this Agreement a Wholly-owned  Subsidiary becomes
a  Non-wholly-owned  Subsidiary  it have only the  rights of a  Non-wholly-owned
Subsidiary;  if  during  the  term of this  Agreement  a  Subsidiary  becomes  a
Non-Subsidiary  it have  only  the  rights,  if any,  of a  Non-Subsidiary.  All
Subsidiaries   are  either   Wholly-owned   Subsidiaries   or   Non-wholly-owned
Subsidiaries.


     Other capitalized terms not defined herein are defined in Schedule A.

     WHEREAS TSA wishes to acquire a world-wide,  non-exclusive, limited license
to copy, use and sublicense a software product developed by Nestor called PRISM
(the "Nestor Software"), which software is more fully described in Schedule A;

     NOW THEREFORE, the Parties agree as follows:

I.   Grant of License.

A. Subject to the provisions of this Agreement, Nestor hereby grants to TSA, and
TSA accepts, a personal,  nontransferable and non-exclusive,  world-wide license
(the "License"), but only:

1.   to use, on the premises of TSA and by TSA employees only, those portions of
     the Nestor Software which are identified in the Schedule as source code for

     (i) creating interfaces between the Nestor Software and TSA Products,

     (ii)  translating into foreign  languages the English language  expressions
that form part of the graphical user interface of the Analysis/Review System (in
the event Nestor desires to use such translation with its other licensees Nestor
shall   reimburse  TSA  the  pro-rata   reasonable   costs  of  developing  such
translation) and

     (iii) modifying the Analysis/Review  System;  provided that, in the case of
this  clause  (iii),  (a) TSA shall have first  requested  that Nestor make such
modification and Nestor shall have declined to do so, and (b) such  modification
shall  become a part of the  Nestor  Software  and shall be owned by Nestor  and
licensed to TSA under this Agreement,  except that Nestor's obligations pursuant
to Sections IV A and V B shall not apply to any such  modification made TSA; and
further  provided  that unless Nestor has approved the  modification  if done by
TSA, Nestor's  obligations pursuant to Section VIIIA shall not apply to any such
modification  or any other  portions  of the Nestor  Software  effected  by such
modifications.

2.   to sublicense and distribute,  within the Field-of-Use, in object-code form
     only,  copies of Nestor  Software to customers  ("Sublicensees")  (provided
     that TSA reproduces on all such copies any copyright and other  proprietary
     notices of Nestor); and

3.   to  reproduce,  modify,  and adapt  the user  documentation  of the  Nestor
     Software,   provided  any  such   modification  that  may  affect  Nestor's
     intellectual  property  rights shall be subject to Nestor's  prior  written
     approval; and

4.   to use, on the  premises of TSA and by TSA  employees  only,  copies of the
     Nestor  Software  solely  for  testing,  development  (only as set forth in
     Section I.A.1),  and  maintenance  purposes and object code only copies for
     demonstration purposes; and

5.   to appoint TSA distributors ("Distributors") which may exercise some or all
     of the rights  granted to TSA herein in the same manner as TSA can exercise
     such rights; provided

     (i) TSA  shall  not  deliver  to any  Distributor  any  part of the  Nestor
Software in source code,  except TSA may disclose to any  Distributor the source
code  described in Section  I.A.1.(ii),  but only for the purpose of translation
into foreign languages as permitted by Section I.A.1.(ii);

     (ii) To the  maximum  extent  permitted  by law,  TSA shall  prohibit  each
Distributor from disassembling,  decompiling,  or "reverse engineering" any part
of the Nestor Software delivered in object code, and

     (iii)  TSA shall  have  entered  into an  agreement  with each  Distributor
containing  such  terms  and  conditions  as are  necessary  to  effectuate  the
provisions and/or limitations on use of Sections I.B and V.C, D, E and F of this
Agreement.

     TSA will  indemnify,  defend and hold Nestor  harmless  from all  expenses,
damages and costs  (including  reasonable  attorney's  fees) or losses resulting
from (i) any act or omission by any Distributor that would breach the provisions
of this Section  I.A.5 and (ii) any act or omission of a  Distributor  that,  if
committed by TSA, would constitute a breach of this Agreement;

B. Except as expressly permitted in Section I.A of this Agreement, and except as
required to  effectuate  the  intentions  of the Parties as expressly  set forth
herein, TSA shall not have any right to use,  sublicense,  copy, modify,  create
derivative works from, rent, lease, assign or transfer any Nestor Software.

     To  the  maximum   extent   permitted  by  law,  TSA  is  prohibited   from
disassembling,  decompiling, or "reverse engineering" in any way any part of the
Nestor Software delivered to TSA in object-code form.

C.  All  rights  not  expressly  granted  to TSA are  reserved  by  Nestor.  All
modifications  made by TSA under  Subsection  I.A.1  shall  become a part of the
Nestor  Software  and shall be owned by Nestor  and  licensed  to TSA under this
Agreement,  and TSA  hereby  grants to Nestor  all  right,  title and  interest,
including but not limited to copyright rights in such modifications.
 
D. Nestor agrees,  so long as this Agreement is in place, not to grant a similar
re-seller  license to any third  party  which  would  allow such third  party to
sublicense the Nestor Software on a Base24  software  platform nor shall grant a
similar  re-seller  license to the  entities  listed on Schedule D. TSA may, not
more often than two years and on ninety days notice,  change the identities (but
not the total number) of the entities on such Schedule. This subsection D is not
applicable  to licenses  which Nestor has in place with third  parties as of the
date of this Agreement or at the date of a change in the Schedule,  nor shall it
be  applicable  for  licenses  which  Nestor is  required to offer by statute or
applicable precedent.

E. Notwithstanding  anything set forth above,  Distributors and Non-wholly-owned
Subsidiaries  may only use,  under this  Section,  the Nestor  Software  for the
purposes set forth in subsection  I.A.1(ii)  above. No source code other than as
necessary to develop the modifications  set forth in subsection  I.A.1(ii) above
shall be provided to Distributors or Non-wholly-owned Subsidiaries.

F. TSA shall take all lawful steps to fully and timely enforce all provisions of
any  agreement  of  any  kind  between  it  and  any  Distributor,  Sublicensee,
consultant or third party which  agreement is  authorized by this  Agreement and
relates in any way or is in  connection  with the Nestor  Software or the Nestor
Technology.  TSA shall promptly  notify Nestor of any such  commencement  of any
such  enforcement  action and provide Nestor with such status reports therein as
Nestor may reasonably require.  TSA shall promptly notify Nestor if the validity
of Nestor's  patent,  copyright,  trade secret,  trademark or other  proprietary
property  rights have become at issue in any such  action,  in which case Nestor
may at any time  thereafter  assume the  responsibility  for enforcement of such
action.  If  Nestor  assumes  such  responsibility,  TSA shall  have no  further
responsibility  or liability  therefor,  Nestor shall have the right to make all
decisions in the matter and any action  Nestor may take therein shall be without
any liability of Nestor to TSA.


II. Right to Sublicense.

A. A sublicense may not:

     (1) transfer  any right,  title or interest in the Nestor  Software  (other
than the right to use Nestor Software under the terms of the sublicense;

     (2) allow any  Sublicensee to  re-sublicense,  unless such  Sublicensee was
never intended to be an entity for which the Nestor Software was to be used on a
productive basis; provided any North American Sublicensee will not be allowed to
sublicense under any circumstances without Nestor's written consent.

B. Each  sublicense  shall also contain  substantially  those terms set forth in
Sections 1.0, 8.0, 10.0 and 11.0 of the Base 24 Agreement and Sections 2.2, 2.6,
2.7, 2.8, 6.0, 7.0, 8.0, 9.0. 11.0, and 12.0 of the Attachment,  as set forth on
Schedule C.

C. Upon request,  TSA shall deliver to Nestor one copy of (i) all  documentation
relating to each version of the Nestor  Software,  including  but not limited to
all packaging and related materials of any kind referring to Nestor,  the Nestor
Software or using any trademark of Nestor, and (ii) all TSA advertising or other
marketing material of any kind referring to Nestor, the Nestor Software or using
any trademark of Nestor.

III. Royalty Rate, Payment and Related Matters.

A. TSA shall pay to Nestor  during the term of this  Agreement  royalties as set
forth in  Schedule  A. Any amount due under  this  Agreement  shall be paid when
specified in this  Agreement,  or, if not so specified,  within thirty (30) days
after the date of any invoice therefor.

     Except as provided in Section IV of this  Agreement  and except if a breach
of  VIII.A  requires  TSA to  refund  amounts  received  under a  sublicense  or
distribution agreement, no payment shall be subject to a refund.

     All payments due to Nestor from TSA shall be made in U.S.  Dollars.  If the
Royalty Base underlying the calculation of any part of Earned Royalties shall he
received by TSA in currency other than U.S. Dollars,  such Royalty Base shall be
converted  to U.S.  Dollars at the  exchange  rate  published in the Wall Street
Journal for the last day of the month immediately  preceding the date of payment
of such Earned Royalty.

     Nestor may charge  interest on any amount not paid when due at the lower of
one (1 %) percent per month or the maximum rate allowed by law.

B. TSA shall be liable  and  responsible  for  payment  of all taxes and  duties
(except  income taxes accrued  against  Nestor)  arising from this Agreement and
shall indemnify and hold Nestor harmless from any failure of TSA to do so.

C. Within  thirty (30) days after the end of each  calendar  quarter  during the
term of this  Agreement,  TSA shall deliver to Nestor a report setting forth the
number of sublicenses of Nestor Software  during such quarter,  together with an
accounting  of all  amounts  constituting  a  part  of the  Royalty  Base  and a
calculation of Earned  Royalties.  TSA will keep such records as will enable the
royalties payable hereunder to be accurately  determined by Nestor. Such records
will be retained by TSA and made available, not more frequently than once during
each  calendar  year of  this  Agreement,  to an  independent  certified  public
accountant  selected by Nestor for examination at the request and at the expense
of Nestor during reasonable business hours at the offices of TSA for a period of
at least five (5) years after the date of the  transactions to which the records
relate.

     If any such audit  determines  that TSA has  understated  an amount owed to
Nestor  by  TSA,   TSA  shall   promptly  pay  to  Nestor  the  amount  of  such
understatement.  If any audit  determines that any such amount is understated by
more than five percent (5%),  TSA shall  additionally  reimburse  Nestor for the
costs of that  audit.  If any such audit  determines  that TSA has  overpaid  an
amount owed to Nestor by TSA, TSA shall be entitled to a credit  against  future
amounts owed to Nestor in the amount of such overpayment.



IV. Third-Party Claims and Actions; Infringement and Unauthorized Use

A.  Provided  TSA has  promptly  upon  learning of a claim or action (but in any
event with sufficient  notice not to cause Nestor's loss of its right to defend)
notified Nestor in writing of an claim or action in which it is alleged that the
Nestor Software  infringes (i) a United States issued patent,  trade secret,  or
copyright or (ii) a foreign  patent,  trade secret or copyright,  and TSA, at no
cost to Nestor (except for reasonable out-of-pocket expenses),  fully cooperates
with Nestor in such settlement or defense, then Nestor at its sole expense shall
take  sole  control  of the  settlement  of such  claim and the  defense  of any
litigation  resulting solely therefrom and shall be responsible for the costs of
such  defense  and will  indemnify  and hold TSA  harmless  from the cost of any
settlement or judgment resulting solely therefrom.

     If, in connection with any such claim, Nestor deems it advisable to replace
parts of the Nestor Software, TSA shall accept such replacement provided that it
has  substantially  the same  functions and features as the part replaced and is
replaced at no cost to TSA or its Sublicensees. If, as a final result of a claim
described  in  the  first  sentence  of  this  Section,  the  use  by TSA or its
Sublicensees  of the Nestor  Software is  enjoined,  Nestor  shall,  at its sole
option  either  (i)  replace  such  parts of the  Nestor  Software  as have been
enjoined  (provided that it has substantially the same functions and features as
the part replaced and is replaced at no cost to TSA or is Sublicensees), or (ii)
procure a license for TSA and its Sublicensees to use same at no additional cost
to TSA or its  Sublicensees,  or (iii) reimburse to TSA 40% of the amounts which
TSA would have to pay Sublicensees under Section 8.2 of Attachment A of Schedule
C.

     Notwithstanding the foregoing and subject to Section V.E of this Agreement,
Nestor  assumes no obligation or liability for, and TSA will  indemnify,  defend
and hold Nestor harmless from any and all expenses,  damages,  costs  (including
reasonable  attorneys'  fees) or  losses  resulting  from any claim or action of
patent infringement,  copyright infringement,  trade secret violation, trademark
or  trade-name  infringement  or  infringement  of any other  proprietary  right
arising from or relating to

     (i) the use of the Nestor  Software in combination  with any other product,
if the use of the Nestor Software alone would not have given rise to such claim,

     (ii)   Nestor's   compliance   with  TSA's   design,   specifications,   or
instructions,

     (iii) any actions or claims of trademark infringement involving any marking
or branding not applied or approved in advance by Nestor,

     (iv) any modification of the Nestor Software not made by Nestor (whether or
not approved by Nestor), or

     (v) any claim of direct or contributory  infringement of any process patent
arising from the use of any Nestor Software if the use of the Nestor Software in
accordance with its documentation would not have given rise to such claim.

     This Section IV.A states the entire  liability and obligation of Nestor and
TSA and the  exclusive  remedy of TSA and its  Sublicensees  with respect to any
actions  or claims of alleged  infringement  relating  to or arising  out of the
subject matter of this Agreement.

B. TSA shall  promptly  notify  Nestor (with full  particulars)  of any possible
infringers  or  unauthorized  users of the Nestor  Software of which TSA obtains
knowledge.  Nestor, in its sole discretion,  shall determine what steps, if any,
are to be taken with  respect to any  infringement  or  unauthorized  use of the
Nestor Software and any damages recovered shall he payable solely to Nestor. TSA
agrees  to  fully  cooperate  with  Nestor,  at no cost to  Nestor  (except  for
reasonable  out-of-pocket  expenses),  in all stages of any such  action.  In no
event shall Nestor be obligated hereunder to commence legal proceedings.


V. Warranties and Covenants.

A. Each Party does hereby  warrant that this Agreement has been duly and validly
authorized  and executed by it and is its valid and binding  obligation and that
it has the legal right and  authority to execute this  Agreement  and to conduct
its activities as contemplated by this Agreement.

B.  Nestor  warrants  that no claim has been made by any  third  party  that the
Nestor  Software  infringes  any United States  issued  patent,  trade secret or
copyright of any such third party.  Nestor warrants that it knows of no claim by
any third party that the Nestor Software infringes any foreign patent, copyright
or trade secret of such third party.

C.  Nestor  warrants  that,  for  a  period  of  ninety  (90)  days  after  each
installation,  the Nestor Software shall  substantially  conform to the document
titled,  Prism  Functional  Description,  which is annexed  hereto as Schedule C
solely for the purpose of listing such functions;  provided,  however, that such
warranty shall be voided in its entirety with respect to any Nestor  Software to
which TSA shall have made any functional  modification without Nestor's approval
or to any Nestor  Software  which shall have been  installed  in a manner not in
accordance with a mutually agreeable installation guide.

D. EXCEPT AS PROVIDED  IN B, C AND F OF THIS  SECTION V, THE NESTOR  SOFTWARE IS
LICENSED  AS-IS.  NESTOR  DOES NOT  WARRANT  THAT THE  NESTOR  SOFTWARE  AND THE
TECHNOLOGY EMBODIED THEREIN ARE CAPABLE OF INDUSTRIAL  REALIZATION OR COMMERCIAL
EXPLOITATION,  THE RISKS OF WHICH ARE BEING  ASSUMED  SOLELY BY TSA,  AND NESTOR
SHALL  HAVE NO  RESPONSIBILITY  FOR THE  CONSEQUENCES  OF ANY  SUCH  FAILURE  OF
INDUSTRIAL REALIZATION OR COMMERCIAL EXPLOITATION.  IT IS UNDERSTOOD THAT NESTOR
IS NOT MAKING AND EXPRESSLY DISCLAIMS ANY REPRESENTATIONS OR WARRANTIES THAT THE
MANUFACTURE,  USE, SUBLICENSING OR SALE OF THE NESTOR SOFTWARE WILL NOT INFRINGE
THE PATENTS,  COPYRIGHTS,  TRADEMARKS OR OTHER  PROPRIETRAY  RIGHTS OF ANY THIRD
PARTY.

E.  EXCEPT  AS  PROVIDED  IN B, C AND F OF  THIS  SECTION  V,  NESTOR  EXPRESSLY
DISCLAIMS ANY AND ALL  WARRANTIES OR GUARANTEES OF ANY KIND  WHATSOEVER,  EITHER
EXPRESS  OR  IMPLIED,   INCLUDING   WITHOUT   LIMITATION   ANY   WARRANTIES   OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

F. REGARDLESS OF WHETHER ANY REMEDY HEREIN FAILS OF ITS ESSENTIAL PURPOSE, IN NO
EVENT WILL NESTOR BE LIABLE FOR ANY INCIDENTAL,  SPECIAL,  EXEMPLARY,  PUNITIVE,
INDIRECT OR CONSEQUENTIAL  DAMAGES ARISING OUT OF OR RELATING IN ANY WAY TO THIS
AGREEMENT,  THE  NESTOR  SOFTWARE  OR THE USE OF THE  SAME  (INCLUDING,  WITHOUT
LIMITATION, DAMAGES FOR LOST INFORMATION, LOST SAVINGS, LOST PROFITS OR BUSINESS
INTERRUPTION),  EVEN IF NESTOR  HAS BEEN  INFORMED,  IS  AWARE,  OR SHOULD BE OR
SHOULD HAVE BEEN AWARE, OF THE POSSIBILITY OF SUCH DAMAGES. NOTHING CONTAINED IN
THIS SUBSECTION F IS INTENDED TO LIMIT NESTOR'S OBLIGATIONS UNDER SECTIONS IV.A.

     THE SOLE REMEDY FOR ANY DISK OR OTHER,  MACHINE READABLE  MATERIAL SUPPLIED
BY  NESTOR  WHICH  IS  PHYSICALLY   DEFECTIVE  SHALL  BE,  AT  NESTOR'S  OPTION,
REPLACEMENT  OF SUCH DISK OR MATERIAL  OR REFUND OF THE  ROYALTY  PAID TO NESTOR
RELATING TO SUCH DISK OR MATERIAL.

     EXCEPT FOR INDEMNIFICATION OF TSA BY NESTOR PURSUANT TO SECTION IV A, IN NO
EVENT WILL NESTOR BE LIABLE IN DAMAGES OR OTHERWISE  IN EXCESS OF THE  ROYALTIES
RECEIVED BY NESTOR FROM TSA HEREUNDER.

     EXCEPT FOR  BREACHES  OF THIS  AGREEMENT  AFFECTING  NESTOR'S  INTELLECTUAL
PROPERTY RIGHTS  (INCLUDING BUT NOT LIMITED TO BREACHES OF SECTIONS I, II, V. F.
(1) AND (2) AND (4), AND VII OF THIS  AGREEMENT)  AND  REGARDLESS OF WHETHER ANY
REMEDY HEREIN FAILS OF ITS ESSENTIAL PURPOSE, IN NO EVENT WILL TSA BE LIABLE FOR
ANY INCIDENTAL,  SPECIAL, EXEMPLARY, PUNITIVE, INDIRECT OR CONSEQUENTIAL DAMAGES
ARISING OUT OF OR RELATING IN ANY WAY TO THIS AGREEMENT,  THE NESTOR SOFTWARE OR
THE  USE  OF  THE  SAME  (INCLUDING,   WITHOUT  LIMITATION,   DAMAGES  FOR  LOST
INFORMATION,  LOST SAVINGS, LOST PROFITS OR BUSINESS INTERRUPTION),  EVEN IF TSA
HAS BEEN  INFORMED,  IS AWARE,  OR SHOULD BE OR SHOULD HAVE BEEN  AWARE,  OF THE
POSSIBILITY OF SUCH DAMAGES.

G. TSA further agrees that:

     (1) it will not use, market, sublicense, deliver or transfer in any way the
Nestor  Software in violation of any  applicable  law, rule or regulation of the
United  States,  or any State of the  United  States or any  foreign  country of
applicable  jurisdiction  (including  without  limitation any United States law,
rule or regulation relating to technology export or transfer) and it will obtain
at its own cost any required export  licenses;  provided Nestor will provide all
reasonable  cooperation  in TSA's  efforts to obtain such export  license and if
such license is used by Nestor with other licensees  Nestor will reimburse TSA a
pro-rata amount of TSA's costs for such license.

     (2) it will not accept any purchase  order or contract  (including  without
limitation any United States or foreign  government  contract) that by its terms
or by  the  operation  of  law  will  abridge  or  otherwise  diminish  Nestor's
intellectual-property  rights  in and/or to the  Nestor  Software  (and all such
orders or contracts  with-any  government  agency will include  "restricted"  or
"limited" rights provisions,  or their  equivalents,  or be on no less favorable
terms to Nestor);

     (3) this  Agreement is a license  agreement  only, not an agreement for the
sale of the Nestor  Software,  and neither TSA nor any  Sublicensee  obtains any
right in or to the Nestor  Software  other than as provided in this Agreement or
the sublicenses.

     (4) TSA shall not infringe the copyright or other  propriety  rights in the
Nestor Software nor permit others within TSA's control (including  Distributors)
to do so.

     (5) it will be solely responsible and liable for all necessary or desirable
steps  to  market  and  (subject  to  Nestor's  providing  the  engineering  and
consulting  support  set forth in Section  VIII.A),  to  adequately  support and
maintain, the Nestor Software.

     (6) As  between  TSA and its  Sublicensees  TSA is solely  responsible  for
warranting  the Nestor  Software  and liable for any  warranty  claims  therefor
(either express, implied or otherwise);and

     (7)  it is  solely  responsible  for  all  expenses  incurred  by it in its
performance of this Agreement.

     (8) As between TSA and Nestor, TSA assumes all responsibility and liability
of the selection of the Nestor Software to achieve the results  intended and for
the use of and results obtained from the Nestor Software.


VI. Term, Extension, Expiration or Termination.

A.  This  Agreement  shall be  effective  as of the date set forth on page 1 and
shall continue thereafter for a term of ten (10) years.

B. TSA may at its  option,  extend  the term of this  Agreement  for  successive
one-year terms up to a maximum of twenty one-year terms if either

     (i) TSA shall have paid to Nestor  during  the  calendar  year  immediately
preceding such extension  Earned  Royalties of not less than two million dollars
($2,000,000) or

     (ii) TSA owns, at the end of such calendar year, not less than ten per cent
of the then issued and outstanding shares of Nestor or

     (iii)  TSA  chooses  to and  does pay the  difference  between  the  Earned
Royalties paid during such calendar year of this Agreement and $2,000,000.

C. Either Party may terminate  this  Agreement and the License by written notice
to the other Party,  if such other Party shall breach any of the  provisions  of
this  Agreement  and such breach  continues  for at least thirty (30) days after
notice  thereof.  TSA may terminate this Agreement and the License by delivering
to Nestor one hundred eighty (l80) days advance written notice thereof.

D. Notwithstanding the foregoing,  this Agreement shall immediately terminate if
TSA liquidates,  dissolves,  shall be adjudicated insolvent,  files or has filed
against  it a petition  in  bankruptcy  or for  reorganization  which,  if filed
against TSA, has not been discharged within one hundred and eighty (180) days of
filing,  takes  advantage  of any  insolvency  act or  proceeding,  including an
assignment for the benefit of creditors, or commits any other act of bankruptcy;
provided,  however, that Nestor shall only have the right to suspend the License
and Nestor's  performance of its  obligations  under this  Agreement  during the
pendency of any undischarged involuntary bankruptcy or reorganization.

E. Notwithstanding any termination or expiration of this Agreement,  the License
and any Sublicenses shall continue in effect with respect to any Nestor Software
sublicensed by TSA prior to termination  or expiration.  In addition,  TSA shall
remain  liable for all  amounts  which have  accrued but not been paid as of the
date of termination.

     In the event of  termination  of this  Agreement  for  breach,  all  future
payments by  Sublicensees  that constitute part of the Earned Royalty Base shall
inure to the benefit, and be payable to the account of, the non-breaching Party.

     In the event of termination of this Agreement by TSA for breach,  TSA shall
pay to Nestor during the remaining term of the respective Sublicensees, for each
Sublicense  then in effect,  the greater of (i) the maintenance fee provided for
in the Sublicense or (ii) an annual amount equal to fifteen percent (15%) of the
Initial License Fees set forth in such Sublicense.

     In addition  thereto,  TSA shall pay to Nestor any  out-of-pocket  costs of
Nestor in connection with maintenance-related travel to Sublicensee sites.

     In consideration of such fees and reimbursed costs,  Nestor will provide to
Sublicensees  during the lesser of (i)the  remaining  term of the  Sublicense in
question,  or (ii) five (5) years from the date of  termination or expiration of
this  Agreement,  the  maintenance  support set forth in Section  VIII A of this
Agreement.

     Termination  or  expiration  of this  Agreement  and the  License  will not
release TSA from any of its obligations or liabilities accrued or incurred under
this Agreement, or rescind or give rise to any right to rescind any payment made
or other consideration given hereunder.

     Upon termination or expiration of this Agreement and the License, TSA shall
cease all  marketing  and other  activities  under the  License and shall (i) at
Nestor's election,  immediately  deliver to Nestor or irretrievably  destroy, or
cause to be delivered or destroyed, any and all Copies of the Nestor Software in
whatever form and any written or other materials relating to the Nestor Software
in TSA's  possession,  custody or  control,  and (ii)  within  thirty (30) days,
deliver to Nestor a  certification  thereof;  provided if Nestor  decides not to
assume an  assignment  of all  sublicenses  TSA may  retain a copy of the Nestor
Software solely for the purposes of maintenance and support.

VII. Confidentiality.

     TSA  acknowledges  that  (i)  the  data  and  information  relating  to the
functioning  of the  Nestor  Software,  and (ii) any other  information  that is
marked   "Confidential"   (in  either  case,   whether   oral,   written  or  in
machine-readable  form) disclosed to TSA by Nestor pursuant to the provisions of
this Agreement  (collectively,  the "Nestor  Technology") contain valuable trade
secrets and other  proprietary  information of Nestor,  that unauthorized use or
disclosure of such Nestor  Technology  would  irreparably  injure Nestor,  which
injury cannot be remedied solely by the payment of money damages. TSA shall hold
in strict  confidence and not disclose,  reproduce or use the Nestor  Technology
with the exception of information which:

     (i) is  already  in the public  domain at the time of  disclosure;  or (ii)
after disclosure  becomes a part of the public domain by publication  other than
by TSA in violation of this Agreement;  or (iii) is received by TSA from a third
party who did not require such  information to be held in confidence and who did
not acquire,  directly or indirectly  through one or more  intermediaries,  such
information from Nestor under any obligation of confidence; or (iv) is agreed to
by Nestor in this  Agreement  or  otherwise  in  writing in advance of such use,
publication or reproduction or (v) if required by law pursuant to a governmental
or judicial mandate,  provided TSA shall have given Nestor prompt notice of such
mandate and  provided  further that TSA shall have taken no action to prevent or
interfere  with efforts  Nestor may take to intervene in any such  proceeding or
otherwise to prevent  such  disclosure;  or (vi) as  necessary to enforce  TSA's
rights and Nestor's  obligations  under this Agreement;  provided TSA shall have
given Nestor prompt notice of such planned  disclosure  and have given Nestor an
opportunity to seek in any such proceeding or otherwise a protective  order with
respect to such disclosure.

     Unless prohibited by another provision of this Agreement,  TSA may disclose
the Nestor Technology only to its employees, consultants and to Distributors and
their respective employees, provided the entity to whom a disclosure is made (i)
needs to know same in order to effectuate  the purposes of this  Agreement,  and
(ii) has entered into a confidentiality  agreement  substantially  equivalent to
the foregoing provisions of this Section VII A.

     TSA agrees to cooperate fully with Nestor, at no cost to Nestor (except for
reasonable  out-of-pocket  expenses), in any action or proceeding whereby Nestor
seeks to prevent or restrain any unauthorized use of the Nestor Technology or to
seek damages therefor.

B. TSA shall not  disclose to Nestor any  information  that TSA  considers to be
confidential  without  first have  received  Nestor's  consent  to receive  such
disclosure.  Any  confidential  information  accepted by Nestor pursuant to such
consent shall be held in confidence under the same terms and conditions as those
applicable to TSA as set forth in subsection A of this Section VII. Nestor shall
promptly  return,  and not retain any  copies  of,  any TSA  information  marked
"confidential" which it does not agree to hold in such confidence.

     Nestor  acknowledges that the information to be delivered to it pursuant to
Section III D of this Agreement shall be deemed to be confidential.

C. All of the  provisions of this Section VII shall survive any  termination  or
expiration of this Agreement or License.


VIII. Consulting, Training And Other Services; Enhancements and Upgrades.

A.  During the term of this  Agreement,  and  provided  that TSA is then in full
compliance  with all of the terms and conditions of this  Agreement  (except for
breaches  which have been fully and timely  cured),  Nestor shall provide to TSA
such commercially  reasonable maintenance support services related to the use of
the Nestor  Software as are  described  in pages 3 and 4 of the Nestor  document
titled PRISM Software and Client Support  (excluding  the  Installation  Program
described  therein),  a  specimen  of which is  attached  to this  Agreement  as
Schedule E.

     In  addition,  provided (i) all error fixes and  upgrades  then  previously
provided by Nestor  have been  installed;  (ii) the Nestor  Software is operated
properly in accordance with any applicable  manuals and other  instructions  and
(iii) the  hardware and software  which is directly or  indirectly  connected or
interconnected  with the Nestor  Software  complies  at all times with a support
obligation no less favorable to the user than the provisions of this  paragraph,
then support services will include modifications as necessary to ensure that all
Nestor  Software  licensed by TSA and  delivered  to  Sublicensees  is Year 2000
Compliant.  "Year 2000  Compliant"  shall mean the  ability of the  software  to
process  calendar days falling on or after January 1, 2000 in the same manner as
it does for calendar dates before such date.

B. Such other services shall be done by Nestor only upon Nestor's acceptance, in
its sole  discretion,  of a written  request from TSA, which request shall be in
the form of a work order  setting forth the work being  requested,  the identity
and location of the relevant  Sublicensee,  and the  requested  installation  or
delivery date.  Upon  acceptance of any such work order,  Nestor shall furnish a
quotation,  and such quotation  shall remain in effect for ninety (90) days from
its  date.  The  Parties  expressly  acknowledge  and  agree  that TSA  shall be
permitted to discount  Nestor's  quotation  up to a maximum  discount of ten per
cent (10%) without the prior written consent of Nestor.

     Except as provided in the  Schedule,  fees  attributable  to  installation,
consulting,  and/or  customization  services  shall  be  retained  by the  Party
performing such services and shall not be subject to any Earned Royalty.

C. In consideration  of such services,  TSA shall pay to Nestor for all services
rendered pursuant to this Section VIII.B engineering fees at the rates set forth
in the  Schedule.  The rates shall remain in effect for one year  following  the
date of  execution of this  Agreement  and  thereafter  shall be adjusted as set
forth in the Schedule.

     TSA shall also  reimburse to Nestor  Nestor's  reasonable  travel  expenses
incurred in  providing  any  services  under this  Section  VIII.  All  services
provided  by Nestor  pursuant to Section  VIII shall be provided to TSA,  not to
TSA's customers.

D.  Nestor  shall  deliver to TSA all  enhancements  and  upgrades to the Nestor
Software that it makes  generally  available at no charge to other  licensees of
PRISM,  other than  enhancements or upgrades which Nestor is prohibited to offer
by  statute  or  applicable  precedent.  Nestor  shall  give TSA  notice  of the
scheduling  releases  no later  than  such  notice is given  generally  to other
licensees of PRISM.  Such  enhancements  and upgrades shall be subject to all of
the terms and conditions of this Agreement.

E. All  payments due under this Section VIII shall be due thirty (30) days after
the end of the month in which the services or expenses to which they relate were
rendered or incurred.  Payments for partial staff weeks or staff months shall be
prorated.  If and to the extent  Nestor  delivers to TSA any software as part of
such  activities,  such  software  shall  be  subject  to all of the  terms  and
conditions of the License and this Agreement.

IX. Source-Code Escrow

     Within 30 days after  execution of this  Agreement  Nestor shall deliver to
the escrow agent a copy of the source code of the Nestor Software, per the terms
of the escrow  agreement  attached  hereto as Exhibit A. Such  escrow  agreement
provides  that the source code shall be  delivered  out of escrow to TSA only if
Nestor
     (i) files for a liquidating bankruptcy or

     (ii) is otherwise  liquidated  and is, or its successor in interest is, and
will continue to be, unable to furnish to TSA the technical support contemplated
by this Agreement or

     (iii) Nestor does not materially provide the technical support contemplated
by this Agreement and continues not to supply such technical  support for twenty
days after notice by TSA of its failure to supply such technical support.

     Any source code  delivered out of escrow to TSA shall be used by TSA solely
to maintain and enhance the Nestor Software delivered to Sublicensees, and shall
be subject to the provisions of Section VII of this  Agreement.  Notwithstanding
the foregoing,  TSA shall be permitted to deliver to any Sublicensee such source
code delivered out of escrow as shall be necessary to permit such Sublicensee to
maintain the Nestor Software or to update or to modify  existing  scoring models
or to create new  scoring  models,  in the event the source  code is released to
sublicensees under 2.7 of the Attachment set forth in Schedule C.

     Other than TSA's right to  terminate  this  Agreement  per Section VI.B for
breach,  and a potential  refund under III.A,  TSA's right to obtain source code
shall constitute TSA's exclusive remedy and Nestor's exclusive liability for the
failure of Nestor or any  successor to Nestor to provide the  technical  support
contemplated by this Agreement. All expenses relating to such escrow arrangement
shall be borne by Nestor.

X. Miscellaneous

A. TSA will  cause any and all of the Nestor  Software  and all  advertising  or
other marketing material of any kind, documentation and packaging therefor to be
marked and labeled with and/or  reference  Nestor's  patent rights,  copyrights,
and/or  trade names in the form and style  furnished by Nestor to TSA. TSA shall
not  otherwise  use or make  reference to such rights,  marks or names of Nestor
without the advance  written  permission of Nestor.  Nestor may, at any time and
from time to time,  in its sole  discretion,  alter or revoke  its  instructions
pursuant  hereto;  provided,  however,  that TSA shall be  permitted to use then
existing  stocks of  documentation  and  advertising  materials  unless,  in the
opinion of counsel to Nestor,  such use would be legally  inadvisable,  in which
case Nestor shall reimburse TSA for the cost of the existing materials.

B. Neither this  Agreement,  the License or other  interest  hereunder  shall be
assignable by either party.

C. The headings and captions used in this Agreement are for convenience only and
are not to be used in the interpretation of this Agreement.

D. The failure of either Party to require  performance  of any provision of this
Agreement shall not affect the right to subsequently  require the performance of
such or any other provision of this  Agreement.  The waiver of either Party of a
breach  of any  provision  shall  not be  taken  or held to be a  waiver  of any
subsequent  breach  of that  provision  or any  subsequent  breach  of any other
provision of this Agreement.

E. The Parties are independent  contractors and engage in the operation of their
own respective  businesses.  Neither Party is the agent or employee of the other
Party for any purpose  whatsoever.  Nothing in this Agreement shall be construed
to establish a relationship  of co-partners or joint  venturers  between the two
Parties.  Neither  Party has the  authority to enter into any contract or assume
any obligation for the other Party or to make any warranty or  representation on
behalf of the other Party.

F. If any  provision of this  Agreement  is, or is  determined  to be,  invalid,
illegal or  unenforceable,  all  remaining  provisions of this  Agreement  shall
nevertheless  remain in full  force and  effect.  Should any  provision  of this
Agreement be found or held to be invalid, illegal or unenforceable,  in whole or
in part,  such  provision  shall be deemed  amended to render it  enforceable in
accordance with the spirit and intent of this Agreement.

G. This  Agreement has been entered into,  delivered,  and is to be governed by,
construed,  interpreted and enforced in accordance with the laws of the State of
New York (without  giving  reference to choice of law  provisions)  from time to
time in  effect.  The  Parties  agree  that the  United  Nations  Convention  on
Contracts  for the  International  Sale of Goods  shall  not apply to any of the
transactions which are contemplated by this Agreement.

H. If a dispute  arises out of or  relates to this  Agreement,  the  License,  a
breach thereof or TSA's use of the Nestor  Software,  and if said dispute cannot
be settled  through direct  discussions,  the Parties agree to first endeavor to
settle the  dispute in an amicable  manner by  mediation  in New York,  New York
administered  by the  American  Arbitration  Association  under its'  Commercial
Mediation Rules. Thereafter,  any unresolved controversy or claim arising out of
or relating to this Agreement, the License, a breach thereof or TSA's use of the
Nestor  Software,   shall  be  settled  by  arbitration   before  three  neutral
arbitrators  (selected  from a panel  of  persons  having  experience  with  and
knowledge of computers and the computer business,  at least one of whom shall be
an  attorney)  in  administered  by  the  American  Arbitration  Association  in
accordance with its Commercial  Arbitration  Rules.  Such  arbitration  shall be
located in New York,  New York if commenced by TSA, and in Chicago,  Illinois if
commenced  by  Nestor.  Any  provisional  or  equitable  remedy  which  would be
available  from a court of law shall be available  from the  arbitrators  to the
Parties.  In any such proceeding  limited civil discovery shall be permitted for
the  production  of  documents,  which shall be governed by the Federal Rules of
Civil Procedure  --(without reference to any local rules of a particular court).
All issues  regarding  discovery  requests shall be decided by the  arbitrators.
Judgment upon the award of the  arbitrators  may be enforced in any court having
jurisdiction  thereof.  The  prevailing  party shall be  entitled to  reasonable
attorney's fees. The Parties hereby consent to the non-exclusive jurisdiction of
the courts of the State of New York or to any Federal Court  located  within the
State of New York for any action (i) to compel arbitration,  (ii) to enforce the
award of the  arbitrators  or (iii) at any time prior to the  qualification  and
appointment of the arbitrators,  for temporary, interim or provisional equitable
remedies and to service of process in any such action by registered mail, return
receipt requested, or by any other means provided by law.

I. This  Agreement  contains the entire and  exclusive  agreement of the Parties
with respect to its subject matter. This Agreement replaces an agreement between
the Parties dated  September 19, 1996 and amended April 18, 1997 and January 14,
1998 (the "Original  Agreement").  The Parties rights and obligations  under the
Original Agreement  continue through the date of this Agreement;  thereafter the
Parties rights and obligations are governed by this Agreement.

Except as otherwise provided in the previous sentence, this Agreement supersedes
any agreements and understandings,  whether written or oral, entered into by the
Parties  prior to its  effective  date and  relating to its subject  matter.  No
modification  or amendment  of this  Agreement  shall be effective  unless it is
stated in writing,  specifically refers hereto and is executed on behalf of each
Party.

J. Except as  otherwise  specified,  all  notices,  payments,  certificates  and
reports hereunder shall be deemed given and in effect as of the date of mailing,
when  sent by  express  mail (or  other  overnight  delivery  service),  postage
prepaid, addressed to the Parties as set forth in the preamble to this Agreement
directed in each case to the President of the Party receiving the notice (and if
to TSA, with copy to General  Counsel of TSA) or to such other  addresses as the
Parties may from time to time give written notice. Each Party shall use its best
efforts to respond expeditiously to requests of the other Party made pursuant to
this Agreement.

K. Except for failure to make any payment when due,  neither  Party hereto shall
be liable to the other for failure or delay in meeting any obligations hereunder
as the result of strikes,  lockouts,  war, Acts of God,  fire,  flood or acts of
government, if beyond the reasonable control of such Party.

L. For a period of one year  following the date of this  Agreement  Nestor shall
provide  office  space,  at no charge,  at Nestor's  facility for one TSA senior
project  management  person to  assist  Nestor  with TSA  related  projects.  In
addition,  Nestor  shall supply  customary  equipment  and  support,  other than
computer  equipment.  TSA shall  remain  responsible  for all of the  salary and
benefits and other employment obligations of such person.

M. So long as TSA  owns  not less  than  ten per  cent of the  then  issued  and
outstanding shares of Nestor,  Nestor agrees on a "best efforts basis" to devote
a minimum of five full time  incremental  qualified  personnel toward the Nestor
Software  specifically  related to TSA's needs. Such needs include,  but are not
limited to,  modeling  and  engineering  (these  personnel do not need to be new
hires).

     IN WITNESS  WHEREOF,  the Parties hereto have set their hands by their duly
authorized representatives as of the day and year first above written.

TRANSACTION SYSTEMS ARCHITECTS, INC.                 NESTOR, INC.
 
By:   /s/ William E. Fisher                 By:  /s/ Nigel Hebborn             
  ---------------------------------          --------------------------------

Name:  William E. Fisher                 Name:   Nigel Hebborn                  
    ---------------------------------          --------------------------------

Title:   Chief Executive Officer        Title:   Chief Financial Officer        
    ---------------------------------          --------------------------------

                                                       
                          REGISTRATION RIGHTS AGREEMENT


     This Registration  Rights Agreement (this  "Agreement") is made and entered
into as of April 28, 1998,  between Nestor,  Inc., a Delaware  corporation  (the
"Company"),  and Transactions  Systems Architects,  Inc., a Delaware corporation
(the "Purchaser").

     This Agreement is made pursuant to the Securities Purchase Agreement, dated
as of the date hereof by and among the Company and the Purchaser  (the "Purchase
Agreement").  The  execution of this  Agreement is a condition to the closing of
the transactions contemplated by the Purchase Agreement.

     The Company and the Purchaser hereby agree as follows:

1. Definitions

     Capitalized  terms used and not  otherwise  defined  herein  shall have the
meanings given such terms in the Purchase Agreement.  As used in this Agreement,
the following terms shall have the following meanings:

     "Affiliate"  means,  with  respect to any  Person,  any other  Person  that
directly or indirectly controls or is controlled by or under common control with
such Person.  For the  purposes of this  definition,  "control,"  when used with
respect to any Person, means the possession, direct or indirect, of the power to
direct or cause the  direction  of the  management  and policies of such Person,
whether  through the ownership of voting  securities,  by contract or otherwise;
and the terms of  "affiliated,"  "controlling"  and  "controlled"  have meanings
correlative to the foregoing.

     "Business Day" means any day except  Saturday,  Sunday and any day on which
banking  institutions  in the  City of New  York  generally  are  authorized  or
required by law or other government actions to close.

     "Closing  Date"  shall  mean the date of the  Closing  as set  forth in the
Purchase Agreement.

     "Closing  Shares"  means the shares of Common Stock issued to the Purchaser
at the  Closing  of the  Purchase  Agreement  and other  Registrable  Securities
issuable in respect thereof.

     "Commission" means the Securities and Exchange Commission.

     "Common Stock" means the Company's Common Stock, par value $.01 per share.

     "Effectiveness Period" means with respect to a Registration Statement filed
under  Section  2(a) or  Section  2(b) the  period  commencing  on the date such
Registration  Statement  is declared  effective  and ending on the date when all
Registrable  Securities covered by the Registration  Statement have been sold or
may be sold  pursuant to Rule 144(k) as determined by the counsel to the Company
pursuant to a written opinion letter, addressed to the Holders, to such effect.

     "Exchange Act" means the Securities Exchange Act of 1934, as amended.

     "Holder" or "Holders" means the holder or holders, as the case may be, from
time to time of Registrable Securities.

     "Indemnified Party" shall have the meaning set forth in Section 5(c).

     "Indemnifying Party" shall have the meaning set forth in Section 5(c).

     "Losses" shall have the meaning set forth in Section 5(a).

     "Person"  means  an  individual  or  a  corporation,   partnership,  trust,
incorporated or  unincorporated  association,  joint venture,  limited liability
company, joint stock company,  government (or an agency or political subdivision
thereof) or other entity of any kind.

     "Proceeding"  means an action,  claim,  suit,  investigation  or proceeding
(including,  without limitation, an investigation or partial proceeding, such as
a deposition), whether commenced or threatened.

     "Prospectus"  means the prospectus  included in any Registration  Statement
(including,  without  limitation,  a prospectus  that  includes any  information
previously omitted from a prospectus filed as part of an effective  registration
statement in reliance upon Rule 430A  promulgated  under the Securities Act), as
amended or supplemented by any prospectus supplement,  with respect to the terms
of the  offering of any  portion of the  Registrable  Securities  covered by the
Registration  Statement,  and  all  other  amendments  and  supplements  to  the
Prospectus,  including post-effective  amendments, and all material incorporated
by reference or deemed to be incorporated by reference in such Prospectus.

     "Registrable  Securities"  means the shares of Common Stock issued pursuant
to the Purchase  Agreement and the shares of Common Stock issuable upon exercise
in full of the  Warrant,  and any  shares  of Common  Stock or other  securities
issued  in  respect  of or in lieu of such  shares  until  such  shares or other
securities are sold pursuant to a Registration Statement or Rule 144;

     "Registration Statement" means any registration statement,  contemplated by
Section 2(a) or 2(b),  including the  Prospectus,  amendments and supplements to
such  registration  statement or Prospectus,  including pre- and  post-effective
amendments,  all exhibits thereto, and all material incorporated by reference or
deemed to be  incorporated  by reference in such  registration  statement or any
other  Registration  Statement  filed by the Company which includes  Registrable
Securities.

     "Rule 144" means Rule 144  promulgated  by the  Commission  pursuant to the
Securities  Act, as such Rule may be amended  from time to time,  or any similar
rule or regulation  hereafter adopted by the Commission having substantially the
same effect as such Rule.
 
     "Rule 158" means Rule 158  promulgated  by the  Commission  pursuant to the
Securities  Act, as such Rule may be amended  from time to time,  or any similar
rule or regulation  hereafter adopted by the Commission having substantially the
same effect as such Rule.
 
     "Rule 415" means Rule 415  promulgated  by the  Commission  pursuant to the
Securities  Act, as such Rule may be amended  from time to time,  or any similar
rule or regulation  hereafter adopted by the Commission having substantially the
same effect as such Rule.

     "Securities Act" means the Securities Act of 1933, as amended.

     "Underwritten  Registration or Underwritten  Offering" means a registration
in connection  with which  securities of the Company are sold to an  underwriter
for reoffering to the public pursuant to an effective registration statement.

     "Warrant" means the Common Stock purchase  warrant issued to the Purchaser,
entitling  the  Purchaser to purchase up to 2,500,000  shares of Common Stock on
the terms and subject to the conditions set forth therein.

     "Warrant  Shares"  shall mean all of the  Registrable  Securities  issuable
pursuant to the Warrant.

 
2. Demand Registrations

     (a)  Within  ten (10)  Business  Days  after  the  written  request  of the
Purchaser  which may be made at any time after March 31, 1999, the Company shall
prepare and file with the Commission a "Shelf"  Registration  Statement covering
all of the Closing  Shares  and/or any other  Registrable  Securities  issued in
respect  thereof for an offering to be made on a  continuous  basis  pursuant to
Rule 415. The Registration  Statement shall be on Form S-3 (or if not available,
Form S-1, or another  appropriate  form approved by the Holders of a majority of
such Registrable  Securities that permit registration of Registrable  Securities
for  resale  by  the  Holders  in the  manner  or  manners  designated  by  them
(including,  without  limitation,  public  or  private  sales  and  one or  more
Underwritten Offerings)).  The Company shall (i) not permit any securities other
than the  Registrable  Securities to be included in the  Registration  Statement
except as required by  registration  rights existing on the date hereof and (ii)
use its  best  efforts  to  cause  the  Registration  Statement  to be  declared
effective  under the Securities Act as promptly as practicable  after the filing
thereof, and to keep such Registration  Statement  continuously  effective under
the Securities Act during the Effectiveness Period; provided,  however, that the
Company  shall  not be  deemed  to have  used  its  best  efforts  to  keep  the
Registration   Statement  effective  during  the  Effectiveness   Period  if  it
voluntarily  takes any action  that  would  legally  impair  the  ability of the
Holders  to sell or  legally  prohibit  the sale of the  Registrable  Securities
covered by such Registration  Statement during the Effectiveness  Period, unless
such  action  is  required  under  applicable  law or the  Company  has  filed a
post-effective  amendment to the  Registration  Statement and the Commission has
not declared it effective.

     (b)  Within  ten (10)  Business  Days  after  the  written  request  of the
Purchaser  which may be made at any time  after the later of March 31,  1999 and
the first date that the Warrant has been  exercised in full,  the Company  shall
prepare and file with the Commission a "Shelf"  Registration  Statement covering
all of the Warrant  Shares  and/or any other  Registrable  Securities  issued in
respect  thereof for an offering to be made on a  continuous  basis  pursuant to
Rule 415. The Registration  Statement shall be on Form S-3 (or if not available,
Form S-1, or another  appropriate  form approved by the Holders of a majority of
such Registrable  Securities that permit registration of Registrable  Securities
for  resale  by  the  Holders  in the  manner  or  manners  designated  by  them
(including,  without  limitation,  public  or  private  sales  and  one or  more
Underwritten Offerings)).  The Company shall (i) not permit any securities other
than the  Registrable  Securities to be included in the  Registration  Statement
except as required by  registration  rights existing on the date hereof and (ii)
use its  best  efforts  to  cause  the  Registration  Statement  to be  declared
effective  under the Securities Act as promptly as practicable  after the filing
thereof, and to keep such Registration  Statement  continuously  effective under
the Securities Act during the Effectiveness Period; provided,  however, that the
Company  shall  not be  deemed  to have  used  its  best  efforts  to  keep  the
Registration   Statement  effective  during  the  Effectiveness   Period  if  it
voluntarily  takes any action that would result in the Holders not being able to
sell the Registrable  Securities  covered by such Registration  Statement during
the Effectiveness Period, unless such action is required under applicable law or
the Company has filed a post-effective  amendment to the Registration  Statement
and the  Commission  has not declared it effective.  The rights of the Purchaser
under this Section 2(b) are in addition to its rights under Section 2(a).

     (c) If the Holders of a majority of the Registrable Securities so elect, an
offering of Registrable  Securities pursuant to a Registration  Statement may be
effected in the form of an  Underwritten  Offering.  In such  event,  and if the
managing  underwriters  advise the Company and such  Holders in writing  that in
their  opinion the amount of  Registrable  Securities  and any other  securities
proposed  to be  sold  in such  Underwritten  Offering  exceeds  the  amount  of
securities  which  can be sold in such  Underwritten  Offering,  there  shall be
included in such  Underwritten  Offering first,  the amount of such  Registrable
Securities  which in the opinion of such managing  underwriters can be sold, and
such amount  shall be  allocated  pro rata among the Holders  proposing  to sell
Registrable  Securities  in such  Underwritten  Offering  and second,  any other
securities proposed to be included in such Underwritten Offering.

     (c) If any of the Registrable  Securities are to be sold in an Underwritten
Offering,  the investment  banker or investment  bankers and manager or managers
that will  administer the offering will be selected by the Holders of a majority
of  the  Registrable  Securities  included  in  such  offering.  No  Holder  may
participate in any Underwritten Offering hereunder unless such Person (i) agrees
to sell its  Registrable  Securities on the basis  provided in any  underwriting
agreements  and (ii)  completes  and  executes  all  questionnaires,  powers  of
attorney,  indemnities,  underwriting  agreements and other  documents  required
under the terms of such arrangements.

3. Registration Procedures

     In  connection  with  the  Company's  registration  obligations  under  any
provision of this Agreement,the Company shall:

     (a) Prepare and file with the  Commission  on or prior to the date required
under Section 2(a) or 2(b), as applicable,  a Registration Statement on Form S-3
(or such other form as provided herein) in accordance with the method or methods
of distribution  thereof as specified by the Holders, and cause the Registration
Statement to become effective and remain effective as provided herein; provided,
however,  that not less than five (5)  Business  Days prior to the filing of the
Registration  Statement or any related Prospectus or any amendment or supplement
thereto  (including  any  document  that would be  incorporated  or deemed to be
incorporated  therein  by  reference),  the  Company  shall (i)  furnish  to the
Holders,  their  counsel  and any  managing  underwriters,  copies  of all  such
documents  proposed to be filed,  which documents (other than those incorporated
or deemed to be incorporated by reference) will be subject to the review of such
Holders,  their  counsel  and such  managing  underwriters,  and (ii)  cause its
officers and directors,  counsel and independent certified public accountants to
respond to such  inquiries as shall be  necessary,  in the opinion of respective
counsel  to  such  Holders  and  such  underwriters,  to  conduct  a  reasonable
investigation  within the meaning of the  Securities  Act. The Company shall not
file the  Registration  Statement or any such  Prospectus  or any  amendments or
supplements  thereto  to which the  Holders  of a  majority  of the  Registrable
Securities, their counsel, or any managing underwriters, shall reasonably object
within five (5) Business Days of receipt  thereof by the Holders,  their counsel
and any managing underwriters, except as required by applicable law.

     (b) (i) Prepare and file with the  Commission  such  amendments,  including
post-effective  amendments, to the Registration Statement as may be necessary to
keep the  Registration  Statement  continuously  effective as to all Registrable
Securities  for the  applicable  time  period  and  prepare  and  file  with the
Commission  such  additional  Registration  Statements  in order to register for
resale under the Securities Act all of the  Registrable  Securities;  (ii) cause
the related Prospectus to be amended or supplemented by any required  Prospectus
supplement,  and as so  supplemented or amended to be filed pursuant to Rule 424
(or any similar  provisions then in force) promulgated under the Securities Act;
(iii)  respond as promptly as  practicable  to any  comments  received  from the
Commission with respect to the Registration  Statement or any amendment thereto;
and (iv) comply with the  provisions of the  Securities Act and the Exchange Act
with respect to the  disposition of all  Registrable  Securities  covered by the
Registration  Statement  during the  applicable  period in  accordance  with the
intended  methods  of  disposition  by the  Holders  thereof  set  forth  in the
Registration Statement as so amended or in such Prospectus as so supplemented.

     (c) Notify the Holders of Registrable  Securities to be sold, their counsel
and any managing underwriters immediately (and, in the case of (i)(A) below, not
less than five (5) days  prior to such  filing)  and (if  requested  by any such
Person)  confirm  such  notice in  writing no later  than one (1)  Business  Day
following  the day (i)(A) when a  Prospectus  or any  Prospectus  supplement  or
post-effective  amendment to the Registration Statement is proposed to be filed;
and  (B)  with  respect  to the  Registration  Statement  or any  post-effective
amendment,  when  the same  has  become  effective;  (i) of any  request  by the
Commission or any other Federal or state  governmental  authority for amendments
or  supplements  to the  Registration  Statement or Prospectus or for additional
information; (ii) of the issuance by the Commission of any stop order suspending
the  effectiveness  of the  Registration  Statement  covering  any or all of the
Registrable  Securities or the initiation of any  Proceedings  for that purpose;
(iii) if at any time any of the  representations  and  warranties of the Company
contained in any agreement (including any underwriting  agreement)  contemplated
hereby  ceases to be true and  correct  in all  material  respects;  (iv) of the
receipt by the Company of any notification with respect to the suspension of the
qualification  or  exemption  from  qualification  of  any  of  the  Registrable
Securities for sale in any jurisdiction, or the initiation or threatening of any
Proceeding  for such purpose;  and (v) of the occurrence of any event that makes
any statement made in the  Registration  Statement or Prospectus or any document
incorporated  or deemed to be  incorporated  therein by reference  untrue in any
material respect or that requires any revisions to the  Registration  Statement,
Prospectus or other documents so that, in the case of the Registration Statement
or the Prospectus,  as the case may be, it will not contain any untrue statement
of a material  fact or omit to state any  material  fact  required  to be stated
therein  or  necessary  to  make  the  statements   therein,  in  light  of  the
circumstances  under which they were made,  not  misleading.  The  Company  will
provide to the Purchaser (a) notice of all oral or written comments  received by
or on  behalf  of the  Company  from  the  Commission  in  connection  with  any
Registration  Statement  hereunder  (and, if such comments are in writing,  will
provide copies thereof to the Purchaser), and (b) copies of any response letters
submitted by or on its behalf in respect of such comments.

     (d) Use its best efforts to avoid the  issuance  of, or, if issued,  obtain
the  withdrawal of (i) any order or other action  terminating  or suspending the
effectiveness of the  Registration  Statement (ii) any termination or suspension
of the qualification (or exemption from qualification) of any of the Registrable
Securities for sale in any jurisdiction, at the earliest possible moment, and to
use  its  best  efforts  to  avoid  any  other  cessation  of  effectiveness  or
qualification  and if such  cessation  occurs  to  cause  the  effectiveness  or
qualification to resume at the earliest practicable moment, and without limiting
the  foregoing  shall  within  fifteen  (15)  days  of  any  such  cessation  of
effectiveness  amend the Registration  Statement in a manner reasonably expected
to obtain the withdrawal of the order suspending the effectiveness  thereof,  or
file an additional Registration Statement covering all of the securities that as
of the date of such filing are Registrable  Securities and the Company shall use
reasonable  efforts to cause such Registration  Statement to become effective as
promptly  as is  practicable  after such  filing  and to keep such  Registration
Statement continuously effective until the end of the Effectiveness Period.

     (e) If requested by any managing  underwriter  or the Holders of a majority
of the  Registrable  Securities  to be sold in connection  with an  Underwritten
Offering,  (i) promptly incorporate in a Prospectus supplement or post-effective
amendment  to the  Registration  Statement  such  information  as such  managing
underwriters  and  such  Holders  reasonably  agree,  and  which  is  reasonably
acceptable to the Company, should be included therein and (ii) make all required
filings of such Prospectus  supplement or such post-effective  amendment as soon
as practicable after the Company has received  notification of the matters to be
incorporated  in  such  Prospectus   supplement  or  post-effective   amendment;
provided,  however,  that the  Company  shall not be required to take any action
pursuant  to this  Section  3(e) that  would,  in the opinion of counsel for the
Company, violate applicable law.

     (f) Furnish to each Holder,  their  counsel and any managing  underwriters,
without charge, at least one conformed copy of each  Registration  Statement and
each amendment  thereto,  including  financial  statements  and  schedules,  all
documents  incorporated or deemed to be incorporated  therein by reference,  and
all exhibits to the extent requested by such Person  (including those previously
furnished  or  incorporated  by  reference)  promptly  after the  filing of such
documents with the Commission.

     (g)  Promptly  deliver  to each  Holder,  their  Special  Counsel,  and any
underwriters,  without charge,  as many copies of the Prospectus or Prospectuses
(including each form of prospectus) and each amendment or supplement  thereto as
such Persons may reasonably request;  and the Company hereby consents to the use
of such  Prospectus  and each  amendment  or  supplement  thereto by each of the
selling Holders and any underwriters in connection with the offering and sale of
the  Registrable  Securities  covered by such  Prospectus  and any  amendment or
supplement thereto.

     (h) Prior to any public  offering of Registrable  Securities,  use its best
efforts to  register  or qualify or  cooperate  with the  selling  Holders,  any
underwriters and their respective counsel in connection with the registration or
qualification  (or exemption from such  registration or  qualification)  of such
Registrable  Securities for offer and sale under the securities or Blue Sky laws
of such  jurisdictions  within  the United  States as any Holder or  underwriter
reasonably  requests in writing, to keep each such registration or qualification
(or exemption therefrom) effective during the Effectiveness Period and to do any
and all other acts or things  reasonably  necessary  or  advisable to enable the
disposition in such  jurisdictions  of the Registrable  Securities  covered by a
Registration  Statement;  provided,  however,  that  the  Company  shall  not be
required to qualify generally to do business in any jurisdiction where it is not
then so qualified or to take any action that would subject it to general service
of process in any such  jurisdiction  where it is not then so subject or subject
the Company to any material tax in any such jurisdiction where it is not then so
subject.

     (i) Cooperate with the Holders and any managing  underwriters to facilitate
the timely  preparation  and delivery of certificates  representing  Registrable
Securities  to be sold,  which  certificates  shall  be free of all  restrictive
legends,  and to enable such Registrable  Securities to be in such denominations
and  registered in such names as any such managing  underwriters  or Holders may
request at least two Business Days prior to any sale of Registrable Securities.

     (j) Upon the occurrence of any event  contemplated by Section 3(c)(vi),  as
promptly  as  practicable,  prepare  a  supplement  or  amendment,  including  a
post-effective  amendment,  to the Registration Statement or a supplement to the
related  Prospectus or any document  incorporated  or deemed to be  incorporated
therein  by  reference,  and file  any  other  required  document  so  that,  as
thereafter  delivered,  neither the  Registration  Statement nor such Prospectus
will contain an untrue  statement of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements  therein,
in light of the circumstances under which they were made, not misleading.

     (k) Use its best efforts to cause all  Registrable  Securities  relating to
such  Registration  Statement to be listed on the quotation system or securities
exchange,  market or  over-the-counter  bulletin board, if any, on which similar
securities issued by the Company are then listed.

     (l) Enter into such agreements  (including,  in the case of an Underwritten
Offering, an underwriting agreement in form, scope and substance as is customary
in  Underwritten  Offerings)  and take  all such  other  actions  in  connection
therewith (including those reasonably requested by any managing underwriters and
the Holders of a majority of the Registrable  Securities being sold) in order to
expedite or facilitate the disposition of such Registrable Securities, and if an
underwriting  agreement  is  entered  into,  (i) make such  representations  and
warranties  to such Holders and such  underwriters  as are  customarily  made by
issuers to underwriters in underwritten  public offerings,  and confirm the same
if and when requested; (ii) obtain and deliver copies thereof to each Holder and
the  managing  underwriters,  if any,  of opinions of counsel to the Company and
updates thereof addressed to each selling Holder and each such  underwriter,  in
form,  scope  and  substance  reasonably   satisfactory  to  any  such  managing
underwriters  and Special  Counsel to the selling  Holders  covering the matters
customarily  covered in opinions  requested in  Underwritten  Offerings and such
other  matters  as may be  reasonably  requested  by such  Special  Counsel  and
underwriters;  (iii)  immediately prior to the effectiveness of the Registration
Statement at the time of delivery of any  Registrable  Securities  sold pursuant
thereto, obtain and deliver copies to the Holders and the managing underwriters,
if any,  of "cold  comfort"  letters and updates  thereof  from the  independent
certified  public  accountants  of the Company  (and,  if  necessary,  any other
independent  certified public accountants of any subsidiary of the Company or of
any  business  acquired  by the  Company  for  which  financial  statements  and
financial  data  is,  or  is  required  to  be,  included  in  the  Registration
Statement),  addressed to each selling Holder and each of the  underwriters,  if
any, in form and  substance as are  customary in  connection  with  Underwritten
Offerings;  (iv) if an  underwriting  agreement is entered into,  the same shall
contain  indemnification  provisions  and  procedures  no less  favorable to the
selling Holders and the underwriters,  if any, than those set forth in Section 7
(or  such  other   provisions   and   procedures   acceptable  to  the  managing
underwriters,  if any,  and  Holders of a  majority  of  Registrable  Securities
participating in such Underwritten  Offering; and (v) deliver such documents and
certificates as may be reasonably  requested by the Holders of a majority of the
Registrable  Securities  being sold,  their  Special  Counsel  and any  managing
underwriters  to evidence  the  continued  validity of the  representations  and
warranties made pursuant to clause 3(l)(i) above and to evidence compliance with
any  customary  conditions  contained  in the  underwriting  agreement  or other
agreement entered into by the Company.

     (m)  Make   available   for   inspection  by  the  selling   Holders,   any
representative of such Holders, any underwriter participating in any disposition
of  Registrable  Securities,  and any  attorney or  accountant  retained by such
selling  Holders or  underwriters,  at the offices where normally  kept,  during
reasonable business hours, all financial and other records,  pertinent corporate
documents  and  properties  of the Company and its  subsidiaries,  and cause the
officers, directors, agents and employees of the Company and its subsidiaries to
supply  all   information   in  each  case   requested   by  any  such   Holder,
representative,  underwriter,  attorney or  accountant  in  connection  with the
Registration  Statement;   provided,  however,  that  any  information  that  is
determined  in good faith by the  Company  in  writing  to be of a  confidential
nature at the time of delivery of such information shall be kept confidential by
such Persons,  unless (i) disclosure of such information is required by court or
administrative  order or is  necessary  to respond to  inquiries  of  regulatory
authorities;  (ii) disclosure of such information,  in the opinion of counsel to
such  Person,  is  required by law;  (iii) such  information  becomes  generally
available  to the public  other than as a result of a  disclosure  or failure to
safeguard by such Person;  or (iv) such  information  becomes  available to such
Person from a source other than the Company and such source is not known by such
Person to be bound by a confidentiality agreement with the Company.

     (n) Comply with all applicable  rules and regulations of the Commission and
make generally  available to its security holders earning statements  satisfying
the  provisions  of Section 11(a) of the  Securities  Act and Rule 158 not later
than 45 days after the end of any  12-month  period (or 90 days after the end of
any 12-month  period if such period is a fiscal year) (i)  commencing at the end
of any fiscal quarter in which  Registrable  Securities are sold to underwriters
in a firm commitment or best efforts Underwritten  Offering and (ii) if not sold
to  underwriters  in such an offering,  commencing on the first day of the first
fiscal  quarter of the  Company  after the  effective  date of the  Registration
Statement,  which  statement  shall cover said 12-month  period,  or end shorter
periods as is consistent with the requirements of Rule 158.

     (o) Provide a CUSIP number for all Registrable  Securities,  not later than
the effective date of the Registration Statement.

     The Company may require each selling  Holder to furnish to the Company such
information  regarding the  distribution  of such  Registrable  Securities as is
required by law to be disclosed in the  Registration  Statement  and the Company
may exclude from such registration the Registrable Securities of any such Holder
who  unreasonably  fails to furnish such  information  within a reasonable  time
after receiving such request.

     If the Registration  Statement refers to any Holder by name or otherwise as
the holder of any  securities  of the  Company,  then such Holder shall have the
right to require (i) the  inclusion  therein of language,  in form and substance
reasonably satisfactory to such Holder, to the effect that the ownership by such
Holder of such  securities  is not to be construed as a  recommendation  by such
Holder of the investment quality of the Company's securities covered thereby and
that such  ownership  does not imply that such Holder will assist in meeting any
future financial  requirements of the Company, or (ii) if such reference to such
Holder by name or otherwise is not required by the Securities Act or any similar
Federal  statute then in force,  the deletion of the reference to such Holder in
any  amendment or  supplement to the  Registration  Statement  filed or prepared
subsequent to the time that such reference ceases to be required.

     Each  Holder  covenants  and agrees  that (i) it will not offer or sell any
Registrable  Securities under the  Registration  Statement until it has received
copies of the  Prospectus as then amended or  supplemented  as  contemplated  in
Section 3(g) and notice from the Company that such  Registration  Statement  and
any  post-effective  amendments thereto have become effective as contemplated by
Section 3(c) and (ii) the Purchaser and its officers,  directors or  Affiliates,
if any, will comply with the prospectus delivery  requirements of the Securities
Act as  applicable to them in connection  with sales of  Registrable  Securities
pursuant to the Registration Statement.

     4.   Registration Expenses.

     (a) All fees and expenses incident to the performance of or compliance with
this  Agreement by the Company shall be borne by the Company  whether or not the
Registration  Statement  is filed or becomes  effective  and  whether or not any
Registrable Securities are sold pursuant to the Registration Statement. The fees
and  expenses  referred  to in the  foregoing  sentence  shall not  include  any
underwriting  discounts and commissions but shall include,  without  limitation,
(i) all registration and filing fees (including,  without  limitation,  fees and
expenses  (A) with  respect to  filings  required  to be made with the  National
Association  of  Securities  Dealers,  Inc.  and (B) in  compliance  with  state
securities  or  Blue  Sky  laws  (including,   without   limitation,   fees  and
disbursements of counsel for the underwriters or Holders in connection with Blue
Sky  qualifications  of the  Registrable  Securities  and  determination  of the
eligibility of the Registrable  Securities for investment under the laws of such
jurisdictions as the managing underwriters,  if any, or Holders of a majority of
Registrable  Securities  may  designate)),  (ii) printing  expenses  (including,
without limitation, expenses of printing certificates for Registrable Securities
and of printing prospectuses if the printing of prospectuses is requested by the
managing  underwriters,  if  any,  or  by  the  Holders  of a  majority  of  the
Registrable Securities included in the Registration Statement), (iii) messenger,
telephone and delivery expenses,  (iv) fees and disbursements of counsel for the
Company as provided in Section  5(b) below,  (v) fees and  disbursements  of all
independent  certified  public  accountants  referred  to in  Section  3(l)(iii)
(including,  without  limitation,  the  expenses of any special  audit and "cold
comfort" letters required by or incident to such  performance),  (vi) Securities
Act liability  insurance,  if the Company so desires such  insurance,  and (vii)
fees and  expenses of all other  Persons  retained by the Company in  connection
with the  consummation of the  transactions  contemplated by this Agreement.  In
addition,  the Company  shall be  responsible  for all of its internal  expenses
incurred in connection with the consummation of the transactions contemplated by
this Agreement (including,  without limitation, all salaries and expenses of its
officers and employees  performing legal or accounting  duties),  the expense of
any annual audit, the fees and expenses  incurred in connection with the listing
of the Registrable  Securities on any quotation system or securities exchange on
which similar securities issued by the Company are then listed.

     (b) In  connection  with the  Registration  Statement,  the  Company  shall
reimburse the Holders for the reasonable fees and  disbursements  of one firm of
attorneys chosen by the Holders of a majority of the Registrable Securities.

5. Indemnification

     (a)  Indemnification  by the Company.  The Company  shall,  notwithstanding
termination of this Agreement and without  limitation as to time,  indemnify and
hold  harmless each Holder,  the  officers,  directors,  agents  (including  any
underwriters  retained by such Holder in  connection  with the offer and sale of
Registrable   Securities),   brokers  (including  brokers  who  offer  and  sell
Registrable  Securities  as  principal as a result of a pledge or any failure to
perform under a margin call of Common Stock),  investment advisors and employees
of each of them, each Person who controls any such Holder (within the meaning of
Section 15 of the  Securities  Act or Section  20 of the  Exchange  Act) and the
officers,  directors,  agents and employees of each such controlling  Person, to
the fullest  extent  permitted by  applicable  law, from and against any and all
losses,  claims,  damages,  liabilities,  costs (including,  without limitation,
costs of preparation and attorneys' fees) and expenses (collectively, "Losses"),
as  incurred,  arising  out of or  relating  to any  untrue  or  alleged  untrue
statement  of a material  fact  contained  in the  Registration  Statement,  any
Prospectus or any form of  prospectus or in any amendment or supplement  thereto
or in any preliminary prospectus,  or arising out of or relating to any omission
or  alleged  omission  of a  material  fact  required  to be stated  therein  or
necessary to make the statements  therein (in the case of any Prospectus or form
of prospectus or supplement  thereto,  in light of the circumstances under which
they were made) not  misleading,  except to the extent,  but only to the extent,
that such untrue  statements  or  omissions  are based  solely upon  information
regarding  such  Holder  furnished  in writing to the Company by or on behalf of
such Holder expressly for use therein,  which  information was reasonably relied
on by the Company for use therein or to the extent that such information relates
to such Holder or such Holder's  proposed  method of distribution of Registrable
Securities  and was  reviewed and  expressly  approved in writing by such Holder
expressly for use in the Registration Statement, such Prospectus or such form of
Prospectus or in any amendment or supplement  thereto.  The Company shall notify
the Holders promptly of the  institution,  threat or assertion of any Proceeding
of which the Company is aware in connection with the  transactions  contemplated
by this Agreement.

     (b)  Indemnification  by  Holders.  In  connection  with  the  Registration
Statement,  each Holder shall furnish to the Company in writing such information
as the Company  reasonably  requests for use in connection with the Registration
Statement or any Prospectus and agrees,  severally and not jointly, to indemnify
and hold harmless the Company, their directors,  officers, agents and employees,
each Person who  controls  the Company  (within the meaning of Section 15 of the
Securities Act and Section 20 of the Exchange Act), and the directors, officers,
agents or employees of such controlling Persons, to the fullest extent permitted
by  applicable  law,  from and against all Losses (as  determined  by a court of
competent  jurisdiction  in a final  judgment  not  subject to appeal or review)
arising  solely out of or based  solely upon any untrue  statement of a material
fact contained in the  Registration  Statement,  any Prospectus,  or any form of
prospectus,  or arising  solely out of or based  solely  upon any  omission of a
material fact required to be stated  therein or necessary to make the statements
therein not misleading to the extent,  but only to the extent,  that such untrue
statement or omission is contained in any information so furnished in writing by
such  Holder to the  Company  specifically  for  inclusion  in the  Registration
Statement or such  Prospectus and that such  information  was reasonably  relied
upon by the Company for use in the  Registration  Statement,  such Prospectus or
such form of prospectus or to the extent that such  information  relates to such
Holder  or  such  Holder's   proposed  method  of  distribution  of  Registrable
Securities  and was  reviewed and  expressly  approved in writing by such Holder
expressly for use in the Registration Statement, such Prospectus or such form of
Prospectus.  In no event shall the liability of any selling Holder  hereunder be
greater in amount than the dollar  amount of the net  proceeds  received by such
Holder  upon  the  sale  of the  Registrable  Securities  giving  rise  to  such
indemnification obligation.

     (c) Conduct of  Indemnification  Proceedings.  If any  Proceeding  shall be
brought or asserted  against  any Person  entitled to  indemnity  hereunder  (an
"Indemnified  Party"),  such Indemnified  Party promptly shall notify the Person
from whom  indemnity is sought (the  "Indemnifying  Party") in writing,  and the
Indemnifying Party shall assume the defense thereof, including the employment of
counsel reasonably  satisfactory to the Indemnified Party and the payment of all
fees and expenses  incurred in connection with defense thereof;  provided,  that
the failure of any  Indemnified  Party to give such notice shall not relieve the
Indemnifying Party of its obligations or liabilities pursuant to this Agreement,
except (and only) to the extent that it shall be finally  determined  by a court
of  competent  jurisdiction  (which  determination  is not  subject to appeal or
further  review)  that  such  failure  shall  have  proximately  and  materially
adversely prejudiced the Indemnifying Party.

     An Indemnified Party shall have the right to employ separate counsel in any
such  Proceeding  and to participate  in the defense  thereof,  but the fees and
expenses of such counsel  shall be at the expense of such  Indemnified  Party or
Parties  unless:  (1) the  Indemnifying  Party  has  agreed to pay such fees and
expenses; or (2) the Indemnifying Party shall have failed promptly to assume the
defense of such Proceeding and to employ counsel reasonably satisfactory to such
Indemnified  Party in any such Proceeding;  or (3) the named parties to any such
Proceeding (including any impleaded parties) include both such Indemnified Party
and the Indemnifying  Party, and such Indemnified  Party shall have been advised
by counsel  that a conflict of  interest is likely to exist if the same  counsel
were to represent such Indemnified  Party and the  Indemnifying  Party (in which
case, if such Indemnified Party notifies the Indemnifying  Party in writing that
it elects to employ separate counsel at the expense of the  Indemnifying  Party,
the  Indemnifying  Party shall not have the right to assume the defense  thereof
and such  counsel  shall  be at the  expense  of the  Indemnifying  Party).  The
Indemnifying Party shall not be liable for any settlement of any such Proceeding
effected  without its written  consent,  which consent shall not be unreasonably
withheld.  No Indemnifying Party shall, without the prior written consent of the
Indemnified Party, effect any settlement of any pending Proceeding in respect of
which any  Indemnified  Party is a party,  unless  such  settlement  includes an
unconditional  release of such  Indemnified  Party from all  liability on claims
that are the subject matter of such Proceeding.

     All fees and expenses of the Indemnified  Party (including  reasonable fees
and  expenses  to the  extent  incurred  in  connection  with  investigating  or
preparing  to defend  such  Proceeding  in a manner not  inconsistent  with this
Section) shall be paid to the Indemnified Party, as incurred, within 10 Business
Days of written notice thereof to the Indemnifying Party.

     (d) Contribution. If a claim for indemnification under Section 6(a) or 6(b)
is  unavailable  to  an  Indemnified  Party  or is  insufficient  to  hold  such
Indemnified Party harmless for any Losses in respect of which this Section would
apply  by its  terms  (other  than by  reason  of  exceptions  provided  in this
Section), then each Indemnifying Party, in lieu of indemnifying such Indemnified
Party,  shall contribute to the amount paid or payable by such Indemnified Party
as a result of such Losses,  in such proportion as is appropriate to reflect the
relative fault of the  Indemnifying  Party and  Indemnified  Party in connection
with the actions,  statements or omissions  that resulted in such Losses as well
as any other  relevant  equitable  considerations.  The  relative  fault of such
Indemnifying  Party and  Indemnified  Party shall be determined by reference to,
among other  things,  whether any action in  question,  including  any untrue or
alleged untrue statement of a material fact or omission or alleged omission of a
material fact, has been taken or made by, or relates to information supplied by,
such Indemnifying  Party or Indemnified Party, and the parties' relative intent,
knowledge,  access to  information  and  opportunity  to correct or prevent such
action, statement or omission. The amount paid or payable by a party as a result
of any Losses shall be deemed to include,  subject to the  limitations set forth
in Section 6(c), any attorneys' or other fees or expenses incurred by such party
in  connection  with any  Proceeding  to the extent  such party  would have been
indemnified  for such fees or expenses if the  indemnification  provided  for in
this Section was available to such party.

     The  parties  hereto  agree  that it  would  not be just and  equitable  if
contribution  pursuant  to  this  Section  6(d)  were  determined  by  pro  rata
allocation or by any other method of allocation  that does not take into account
the equitable considerations referred to in the immediately preceding paragraph.
Notwithstanding  the provisions of this Section 6(d), the Purchaser shall not be
required to contribute,  in the aggregate, any amount in excess of the amount by
which the  proceeds  actually  received  by the  Purchaser  from the sale of the
Registrable  Securities  subject  to the  Proceeding  exceeds  the amount of any
damages that the Purchaser has otherwise  been required to pay by reason of such
untrue or alleged untrue  statement or omission or alleged  omission.  No Person
guilty of fraudulent  misrepresentation  (within the meaning of Section 11(f) of
the Securities  Act) shall be entitled to  contribution  from any Person who was
not guilty of such fraudulent misrepresentation.

     The indemnity and contribution  agreements contained in this Section are in
addition  to any  liability  that  the  Indemnifying  Parties  may  have  to the
Indemnified Parties.

6. Rule 144

     The  Company  shall file the  reports  required to be filed by it under the
Securities  Act and the Exchange Act in a timely  manner and, if at any time the
Company is not required to file such reports, they will, upon the request of any
Holder, make publicly available other information so long as necessary to permit
sales of its securities pursuant to Rule 144. The Company further covenants that
it will take such further  action as any Holder may reasonably  request,  all to
the extent required from time to time to enable such Holder to sell  Registrable
Securities  without  registration under the Securities Act within the limitation
of the  exemptions  provided by Rule 144.  Upon the  request of any Holder,  the
Company  shall  deliver  to  such  Holder  a  written  certification  of a  duly
authorized officer as to whether it has complied with such requirements.

7. Miscellaneous

     (a)  Remedies.  In the event of a breach by the Company or by a Holder,  of
any of their  obligations under this Agreement,  each Holder or the Company,  as
the case may be, in addition to being entitled to exercise all rights granted by
law and under this Agreement, including recovery of damages, will be entitled to
specific  performance of its rights under this  Agreement.  The Company and each
Holder agree that monetary damages would not provide  adequate  compensation for
any losses incurred by reason of a breach by it of any of the provisions of this
Agreement  and  hereby  further  agrees  that,  in the event of any  action  for
specific  performance in respect of such breach, it shall waive the defense that
a remedy at law would be adequate.

     (b) No  Inconsistent  Agreements.  The  Company  shall not  enter  into any
agreement with respect to its securities  that is  inconsistent  with the rights
granted  to the  Holders  in this  Agreement  or  otherwise  conflicts  with the
provisions  hereof.  Except  as set  forth  in the  Disclosure  Schedule  to the
Purchase  Agreement  the Company has not  previously  entered into any agreement
granting any  registration  rights with respect to any of its  securities to any
Person.  Without  limiting the generality of the foregoing,  without the written
consent  of the  Holders  of a  majority  of the  then  outstanding  Registrable
Securities,  the Company  shall not grant to any Person the right to request the
Company to register  any  securities  of the Company  under the  Securities  Act
unless the rights so granted are subject in all  respects to the prior rights in
full of the  Holders  set forth  herein,  and are not  otherwise  in conflict or
inconsistent with the provisions of this Agreement.

     (c) Piggy-Back Registrations. If at any time the Company shall determine to
prepare and file with the  Commission a  registration  statement  relating to an
offering for its own account or the account of others under the  Securities  Act
of any of its  equity  securities,  other  than on Form S-4 or Form S-8 (each as
promulgated  under the  Securities  Act) or their then  equivalents  relating to
equity  securities to be issued solely in connection with any acquisition of any
entity or business or equity securities issuable in connection with stock option
or other  employee  benefit  plans,  the  Company  shall send to each  Holder of
Registrable  Securities  written  notice of such  determination  and,  if within
twenty (20) days after receipt of such notice,  any such Holder shall so request
in writing, the Company shall include in such registration  statement all or any
part of the Registrable Securities such holder requests to be registered, except
that if, in  connection  with any  Underwritten  Offering for the account of the
Company the managing  underwriter(s)  thereof  shall impose a limitation  on the
number of  shares of Common  Stock  which may be  included  in the  registration
statement  because,  in  such  underwriter(s)'   judgment,  such  limitation  is
necessary  to  effect an  orderly  public  distribution  of  securities  covered
thereby,  then the Company  shall be obligated  to include in such  registration
statement only such limited portion of the  Registrable  Securities for to which
such Holder has requested  inclusion  hereunder.  Any  exclusion of  Registrable
Securities  shall  be made  pro  rata  among  the  Holders  seeking  to  include
Registrable  Securities,  in proportion to the number of Registrable  Securities
sought to be included by such Holders; provided, however, that the Company shall
not exclude any Registrable Securities unless the Company has first excluded all
outstanding  securities  the  Holders  of  which  are not  entitled  by right to
inclusion of securities in such Registration Statement;  and provided,  further,
however,  that, after giving effect to the immediately  preceding  proviso,  any
exclusion of Registrable Securities shall be made pro rata with Holders of other
securities  having the right to include  such  securities  in such  registration
statement. No right to registration of Registrable Securities under this Section
shall be construed to limit any registration otherwise required hereunder.

     (d) Amendments and Waivers. The provisions of this Agreement, including the
provisions of this sentence, may not be amended,  modified or supplemented,  and
waivers or consents to departures  from the provisions  hereof may not be given,
unless the same shall be in writing and signed by the Company and the Holders of
at least a majority of the then outstanding  Registrable  Securities;  provided,
however,  that, for the purposes of this sentence,  Registrable  Securities that
are owned,  directly or  indirectly,  by the  Company,  or an  Affiliate  of the
Company are not deemed outstanding.  Notwithstanding the foregoing,  a waiver or
consent to depart  from the  provisions  hereof  with  respect to a matter  that
relates  exclusively  to the rights of  Holders  and that does not  directly  or
indirectly  affect  the  rights of other  Holders  may be given by Holders of at
least a majority of the  Registrable  Securities to which such waiver or consent
relates;  provided,  however,  that the  provisions  of this sentence may not be
amended,  modified,  or supplemented except in accordance with the provisions of
the immediately preceding sentence.

     (e) Notices. Any notice or other communication  required or permitted to be
given  hereunder  shall be in writing and shall be deemed to have been  received
(a) upon hand delivery (receipt acknowledged) or delivery by telex (with correct
answer back  received),  telecopy or facsimile (with  transmission  confirmation
report) at the address or number  designated  below (if  delivered on a business
day during normal  business  hours where such notice is to be received),  or the
first  business  day  following  such  delivery  (if  delivered  other than on a
business day during normal  business  hours where such notice is to be received)
or (b) on the  second  business  day  following  the date of  mailing by express
courier  service,  fully  prepaid,  addressed  to such  address,  or upon actual
receipt of such  mailing,  whichever  shall first occur.  The addresses for such
communications shall be:

                  If to the Company:
                           Nestor, Inc.
                           One Richmond Square
                           Providence, Rhode Island 02906
                           Attention:  Chief Executive Officer

                  With copies to:
                           Baer Marks & Upham
                           805 Third Avenue
                           New York, NY  10022-7513
                           Attention:  Herbert S. Meeker, Esq.

                  If to the Purchaser:
                           Transaction Systems Architects, Inc.
                           224 South 108 Avenue
                           Omaha, Nebraska  68154
                           Attention:  David P. Stokes

                  If to any other Person who is then
                    the registered Holder:
                           To the address of such Holder
                           as it appears in the stock transfer
                           books of the Company
 
or such other  address as may be designated  in writing  hereafter,  in the same
manner, by such Person.

     (f)  Successors and Assigns.  This Agreement  shall inure to the benefit of
and be binding upon the successors and permitted  assigns of each of the parties
and shall inure to the benefit of and be binding upon each  Holder.  The Company
may not assign its rights or  obligations  hereunder  without the prior  written
consent of each  Holder;  provided,  however,  that the  Company  may assign its
rights or  obligations  hereunder  without  such  consent in  connection  with a
transaction  described in Section 3.1 of the Warrant if the terms and conditions
of  Section  3.2 of the  Warrant  are  satisfied.  The  rights of the  Purchaser
hereunder,  including  the  right  to  have  the  Company  register  for  resale
Registrable Securities in accordance with the terms of this Agreement,  shall be
automatically  assignable  by the Purchaser to any assignee or transferee of all
or a portion of the Registrable Securities.

     (g)  Counterparts.  This  Agreement  may  be  executed  in  any  number  of
counterparts,  each of which when so executed  shall be deemed to be an original
and, all of which taken together shall constitute one and the same Agreement. In
the event that any  signature  is  delivered  by  facsimile  transmission,  such
signature shall create a valid binding  obligation of the party executing (or on
whose behalf such signature is executed) the same with the same force and effect
as if such facsimile signature were the original thereof.

     (h) Governing Law;  Submission to  Jurisdiction;.  This Agreement  shall be
governed by and construed in accordance  with the laws of the State of Delaware,
without regard to principles of conflicts of law.

     (i) Cumulative  Remedies.  The remedies  provided herein are cumulative and
not exclusive of any remedies provided by law.

     (j) Severability.  If any term, provision,  covenant or restriction of this
Agreement is held by a court of competent  jurisdiction to be invalid,  illegal,
void or  unenforceable,  the remainder of the terms,  provisions,  covenants and
restrictions set forth herein shall remain in full force and effect and shall in
no way be affected,  impaired or  invalidated,  and the parties hereto shall use
their reasonable  efforts to find and employ an alternative means to achieve the
same or  substantially  the  same  result  as that  contemplated  by such  term,
provision,  covenant or restriction.  It is hereby stipulated and declared to be
the intention of the parties that they would have executed the remaining  terms,
provisions, covenants and restrictions without including any of such that may be
hereafter declared invalid, illegal, void or unenforceable.

     (k)  Headings.  The  headings  in this  Agreement  are for  convenience  of
reference only and shall not limit or otherwise affect the meaning hereof.

     (l) Shares Held by The Company and its Affiliates.  Whenever the consent or
approval of Holders of a  specified  percentage  of  Registrable  Securities  is
required hereunder, Registrable Securities held by the Company or its Affiliates
(other than the Purchaser or  transferees  or  successors or assigns  thereof if
such Persons are deemed to be Affiliates  solely by reason of their  holdings of
such Registrable  Securities)  shall not be counted in determining  whether such
consent or approval was given by the Holders of such required percentage.

     IN WITNESS WHEREOF, the parties have executed this Agreement as of the date
first written above.


                                           NESTOR, INC.



                                   By:    /s/ Nigel Hebborn
                                        ------------------------------------   
                                                              
                                   Name:  Nigel Hebborn                       
                                       ------------------------------------    
                                 
                                   Title:  Chief Financial Officer            
                                        ------------------------------------


                                        TRANSACTION SYSTEMS ARCHITECTS,INC.


                                    By:  /s/ William E. Fisher
                                        ------------------------------------  
                                                              
                                   Name:  William E. Fisher                  
                                        -----------------------------------    
                                  
                                   Title: Chief Executive Officer           
                                         -----------------------------------