LIGHTBRIDGE INC
S-1/A, 1996-08-27
RADIOTELEPHONE COMMUNICATIONS
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<PAGE>
 
    
 AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 27, 1996     
                                                      REGISTRATION NO. 333-6589
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
                                ---------------
                                
                             AMENDMENT NO. 2     
 
                                      TO
                                   FORM S-1
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933
                                ---------------
                               LIGHTBRIDGE, INC.
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
         DELAWARE                    4812                    04-3065140
     (STATE OR OTHER       (PRIMARY STANDARD INDUSTRIAL     (I.R.S. EMPLOYER
     JURISDICTION OF       CLASSIFICATION CODE NUMBER)   IDENTIFICATION NUMBER)
     INCORPORATION OR
      ORGANIZATION)
                                ---------------
                              281 WINTER STREET
                         WALTHAM, MASSACHUSETTS 02154
                                (617) 890-2000
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                                ---------------
                              PAMELA D.A. REEVE 
                              LIGHTBRIDGE, INC. 
                              281 WINTER STREET 
                        WALTHAM, MASSACHUSETTS 02154 
                                (617) 890-2000
          (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, 
                  INCLUDING AREA CODE, OF AGENT FOR SERVICE)
                                ---------------
                                  COPIES TO:
  JOHN D. PATTERSON, JR., ESQ.                    MARK H. BURNETT, ESQ. 
     MARK L. JOHNSON, ESQ.                  TESTA, HURWITZ & THIBEAULT, LLP 
    FOLEY, HOAG & ELIOT LLP                        HIGH STREET TOWER
 ONE POST OFFICE SQUARE BOSTON,                     125 HIGH STREET 
     MASSACHUSETTS 02109                      BOSTON, MASSACHUSETTS 02110 
       (617) 832-1000                               (617) 248-7000
                                ---------------
  APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after this Registration Statement becomes effective.
  If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box. [_]
  If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act of 1933, check the following
box and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [_]
     ---------
  If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act of 1933, check the following box and list the
Securities Act registration statement number of the earlier effective
registration statement for the same offering.  [_]
       
                                                                          -----
  If delivery of the prospectus is expected to be made pursuant to Rule 434,
check the following box. [X]
 
                                ---------------
                        
                     CALCULATION OF REGISTRATION FEE     
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<TABLE>   
<CAPTION>
                                                         PROPOSED
                                                         MAXIMUM     PROPOSED MAXIMUM
       TITLE OF EACH CLASS OF          AMOUNT TO BE   OFFERING PRICE     AGGREGATE        AMOUNT OF
    SECURITIES TO BE REGISTERED       REGISTERED(1)    PER SHARE(2)  OFFERING PRICE(2) REGISTRATION FEE
- -------------------------------------------------------------------------------------------------------
<S>                                  <C>              <C>            <C>               <C>
Common Stock, $.01 par value.......  4,370,000 shares     $10.00        $43,700,000        $15,069
</TABLE>    
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
   
(1) Includes 570,000 shares of Common Stock subject to the Underwriters' over-
    allotment option.     
   
(2) Estimated solely for the purpose of determining the registration fee
    pursuant to Rule 457(a) under the Securities Act of 1933.     
       
       
                                ---------------
  THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS
REGISTRATION STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH
SECTION 8(A) OF THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT
SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID
SECTION 8(A), MAY DETERMINE.
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------

<PAGE>
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A         +
+REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE   +
+SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY  +
+OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT        +
+BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR   +
+THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE      +
+SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE    +
+UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF  +
+ANY SUCH STATE.                                                               +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
PROSPECTUS (Subject to Completion)
   
Dated August 27, 1996     
                                
                             3,800,000 Shares     
 
 
                        [LIGHTBRIDGE LOGO APPEARS HERE]
 
                                  Common Stock
 
                                 -------------
   
  Of the 3,800,000 shares of Common Stock offered hereby, 3,021,868 shares are
being sold by Lightbridge, Inc. ("Lightbridge" or the "Company") and 778,132
shares are being sold by certain selling stockholders (the "Selling
Stockholders"). The Company will not receive any of the proceeds from the sale
of shares by the Selling Stockholders. See "Principal and Selling
Stockholders."     
   
  Prior to this offering, there has been no public market for the Common Stock
of the Company. It is currently estimated that the initial public offering
price will be between $8.00 and $10.00 per share. See "Underwriting" for
information relating to the factors to be considered in determining the initial
public offering price. The Common Stock has been approved for quotation on the
Nasdaq National Market under the symbol "LTBG."     
 
                                 -------------
 
 THIS OFFERING INVOLVES A HIGH DEGREE OF RISK. SEE "RISK FACTORS," BEGINNING ON
                           PAGE 6 OF THIS PROSPECTUS.
 
                                 -------------
 
THESE SECURITIES  HAVE NOT BEEN APPROVED  OR DISAPPROVED BY  THE SECURITIES AND
EXCHANGE COMMISSION  OR ANY STATE SECURITIES COMMISSION NOR HAS  THE SECURITIES
 AND EXCHANGE COMMISSION  OR ANY  STATE SECURITIES COMMISSION  PASSED UPON THE
 ACCURACY OR  ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION  TO THE CONTRARY
  IS A CRIMINAL OFFENSE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                          Underwriting              Proceeds to
                                Price to Discounts and  Proceeds to   Selling
                                 Public  Commissions(1) Company(2)  Stockholders
- --------------------------------------------------------------------------------
<S>                             <C>      <C>            <C>         <C>
Per Share......................   $           $            $            $
Total(3).......................  $           $            $            $
</TABLE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
(1) The Company and the Selling Stockholders have agreed to indemnify the
    Underwriters against certain liabilities, including liabilities under the
    Securities Act of 1933. See "Underwriting."
(2) Before deducting expenses payable by the Company estimated to be $850,000.
   
(3) Certain of the Selling Stockholders have granted the Underwriters an
    option, exercisable within 30 days of the date hereof, to purchase an
    aggregate of up to 570,000 additional shares of Common Stock at the Price
    to Public less Underwriting Discounts and Commissions to cover over-
    allotments, if any. If all such shares are purchased, the total Price to
    Public, Underwriting Discounts and Commissions and Proceeds to Selling
    Stockholders will be $   , $    and $   , respectively. See "Underwriting"
    and "Principal and Selling Stockholders."     
 
                                 -------------
 
  The Common Stock is offered by the several Underwriters named herein when, as
and if received and accepted by them, and subject to their right to reject
orders in whole or in part and subject to certain other conditions. It is
expected that delivery of certificates for such shares will be made at the
offices of Cowen & Company, New York, New York, on or about       , 1996.
 
                                 -------------
 
COWEN & COMPANY
                    MONTGOMERY SECURITIES
                                              PRUDENTIAL SECURITIES INCORPORATED
 
      , 1996
<PAGE>
 
 
 
 
         [IMAGE OF LIGHTBRIDGE LOGO SUPERIMPOSED ON IMAGES OF
       WIRELESS TELECOMMUNICATIONS EQUIPMENT AND NOMENCLATURE,
      FOLLOWED BY CAPTION "LIGHTBRIDGE'S OBJECTIVE IS TO BE THE
       LEADING PROVIDER OF INNOVATIVE, SOFTWARE-BASED SOLUTIONS
      FOR COST-EFFECTIVE CUSTOMER ACQUISITION AND RETENTION FOR
             THE WIRELESS TELECOMMUNICATIONS INDUSTRY."]
 
 
 
 
                               ----------------
 
  The Company intends to furnish its stockholders with annual reports
containing financial statements audited by its independent accountants and
quarterly reports containing unaudited financial information for the first
three quarters of each fiscal year.
 
  IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK
OF THE COMPANY AT A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN
MARKET. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
<PAGE>
 
          LIGHTBRIDGE SOLUTIONS FOR CUSTOMER ACQUISITION AND RETENTION
       
<TABLE>   
<CAPTION>
           SAMS(TM)                      IRIS(TM)                       POPS(TM)
           --------                      --------                       --------
<S>                            <C>                           <C>
Laptop-based "virtual office"  Self-service multimedia       Windows-based qualification
for the mobile wireless sales  education, sales, activation  and activation processing at
professional.                  and vending system.           the retail point-of-sale.
[image of laptop computer]     [image of vending kiosk]      [image of retail transaction]
</TABLE>    
                             
                          [Circular Image]--Text:     
                         
                      Distributed Workflow Management     
                  
               Lightbridge's Transaction Management Backbone     
     
  Security . Validation . Notification . Exception Handling . Data Management
                                             
[Text to the Left of Circular Image]:     
   
ACQUISITION     
    
 Applicant Screening     
    
 .ProFile(R)     
     
  Proprietary Intercarrier Fraud Database     
    
 .Postalpro(TM)     
     
  Address Verification & Correction     
    
 .Fraud Detect(TM)     
     
  Identification Information Verification     
    
 .Insight(TM)     
     
  Proprietary Existing Customer Database     
    
 Credit Qualification     
    
 .Credit Decision System(TM) (CDS)     
     
  On-line Real-time Credit Decisions     
   
[Text to the Right of Circular Image]:     
   
WIRELESS INTELLIGENCE(TM)     
    
 Decision Support & Data Warehouse Services     
    
 .Channel Wizard(TM)     
     
  Sales Channel Performance Analysis     
    
 .Churn Prophet(TM)     
     
  Data Mining for Churn Prediction     
   
TELESERVICES(TM)     
    
 .Qualification & Activation Outsourcing     
    
 .Telemarketing     
    
 .Back-up & Disaster Recovery     
    
 .Customer Care     
   
[Text and Graphics Below Circular Image]:     
   
BUSINESS INTEGRATION     
 
<TABLE>   
<CAPTION>
<S>                              <C>                             <C> 
Links to:                        Links to:                        Links to:
Payment Systems                  Activation Systems               Fulfillment Systems
Processing of payments with      Establishment of accounts &      Delivery of product from
credit card. [image of credit    activation through carrier &     carrier & third party
cards]                           third party billing systems.     distribution centers. [image
                                 [image of call in progress]      of delivery center]
</TABLE>    
   
Fraud Detect is a trademark of TRANS UNION.     
<PAGE>
 
 
 
 
 
<PAGE>
 
                               PROSPECTUS SUMMARY
   
  The following summary is qualified in its entirety by the more detailed
information and Financial Statements and Notes thereto appearing elsewhere in
this Prospectus. Unless otherwise indicated, all information in this Prospectus
(i) gives effect to a 2-for-1 stock split effected on July 15, 1996, (ii)
except in the Financial Statements and Notes thereto, reflects the conversion
of all outstanding shares of the Company's Redeemable Convertible Preferred
Stock (collectively, the "Convertible Preferred Stock") into 5,247,324 shares
of Common Stock and the issuance of 405,065 shares of Common Stock upon
exercise of certain warrants, all upon the closing of this offering, (iii)
gives effect to the repurchase by the Company of 200,000 shares of Common Stock
from an existing stockholder on or before September 3, 1996 and the purchase by
certain stockholders of the Company of an aggregate of 200,000 shares of Common
Stock from an existing stockholder on or before September 3, 1996, (iv) gives
effect to the filing of an Amended and Restated Certificate of Incorporation
immediately after the closing of this offering to, among other things, create a
new class of undesignated preferred stock and (v) assumes no exercise of the
Underwriters' over-allotment option. See "Description of Capital Stock" and
"Underwriting."     
 
                                  THE COMPANY
 
  Lightbridge, Inc. ("Lightbridge" or the "Company") develops, markets and
supports a suite of integrated products and services that enable wireless
telecommunications carriers to improve their customer acquisition and retention
processes. The Company's software-based services are delivered primarily on an
outsourcing and service bureau basis, which allows wireless carriers to focus
internal resources on their core business activities. The Company offers on-
line, real-time transaction processing and call center support solutions to aid
carriers in qualifying and activating applicants for wireless service, as well
as software-based sales support services for traditional distribution channels,
such as dealers, agents and direct mobile sales forces, and emerging
distribution channels, such as mass market retail stores, home shopping and
stand-alone kiosks. The Company develops and implements interfaces that fully
integrate its acquisition system with carrier and third-party systems, such as
those for billing, point-of-sale, activation and order fulfillment. The Company
recently introduced software-based decision support tools and services that
enable carriers to reduce subscriber churn and to make more informed business
decisions about their customers, markets and distribution channels.
 
  Over the past 10 years, the number of U.S. cellular subscribers has increased
58% on a compounded annual basis, as the market for cellular phones has evolved
from serving early adopters to serving mass market consumers. While cellular
service historically has represented the largest sector of the U.S. wireless
telecommunications industry, other wireless services, such as personal
communication services ("PCS") and enhanced specialized mobile radio ("ESMR"),
are emerging as competitive alternatives to cellular services. In the midst of
strong subscriber growth and increasing competition, wireless carriers are
encountering high costs of acquisition, declining revenues per subscriber,
escalating losses from subscription fraud and lost revenues from churn in
subscriber bases.
 
  Lightbridge's objective is to be the leading provider of innovative,
software-based solutions for cost-effective customer acquisition and retention
for the wireless telecommunications industry. By focusing on the wireless
telecommunications industry, the Company has developed significant expertise
and experience that it intends to employ to address the changing needs of
wireless carriers in both existing and emerging markets. The Company's strategy
is to provide a suite of complementary software-based products and services
that permit a wireless carrier to select applications and functions to create
an integrated, customized solution addressing its particular needs. The open
architecture underlying the Company's software applications supports the
development of flexible, integrated solutions, regardless of the type of
wireless service provided by a client and independent of the client's computing
environment.
 
  The Company develops long-term consultative relationships with leading
wireless carriers that assist it in identifying evolving industry needs and
marketing additional products and services to its existing client base.
Lightbridge also establishes relationships with strategic partners in order to
increase the functionality of its products, reduce the time to market for its
new products and services, and access its partners' marketing and
 
                                       3
<PAGE>
 
development resources. The Company intends to leverage these consultative and
partnering relationships to expand the Company's presence in the United States,
including in the emerging PCS market, and to facilitate and expedite the
Company's entry into the rapidly expanding international wireless market.
 
  The Company sells its products and services through a direct sales force. The
Company's current client base consists of 39 wireless telecommunication
clients, including 8 of the 12 largest domestic cellular carriers (based on
total population coverage) and the only 3 domestic carriers currently
delivering PCS service. In the year ended September 30, 1995, approximately 94%
of the Company's revenues was attributable to carriers that were also clients
in the preceding fiscal year.
 
  Lightbridge was incorporated in Delaware in June 1989 under the name Credit
Technologies, Inc. and changed its name to Lightbridge, Inc. in November 1994.
The Company's principal executive offices are located at 281 Winter Street,
Waltham, Massachusetts 02154, and its telephone number is (617) 890-2000.
 
                                  THE OFFERING
 
<TABLE>   
<S>                               <C>
Common Stock offered:
  By the Company.................  3,021,868 shares
  By the Selling Stockholders....    778,132 shares
Common Stock to be outstanding
 after the offering.............. 14,530,377 shares(1)
Use of Proceeds.................. For repayment of indebtedness, for payment of
                                  the exercise price of repurchase options to
                                  acquire 400,000 shares of Common Stock, and
                                  for working capital and other general
                                  corporate purposes, including potential
                                  acquisitions
Proposed Nasdaq National Market
 symbol.......................... LTBG
</TABLE>    
- --------
   
(1) Excludes, as of August 26, 1996, (i) 1,615,800 shares of Common Stock
    issuable upon the exercise of outstanding options at a weighted average
    exercise price of $1.80 per share, (ii) 1,000,000 shares of Common Stock
    reserved for future option grants under the Company's 1996 Incentive and
    Nonqualified Stock Option Plan, (iii) 100,000 shares of Common Stock
    reserved for issuance under the Company's 1996 Employee Stock Purchase Plan
    and (iv) 750,250 shares of Common Stock issuable upon the exercise of
    warrants at an exercise price of $2.00 per share and 100,000 shares of
    Common Stock issuable upon the exercise of a warrant at an exercise price
    equal to the initial public offering price set forth on the front cover
    page hereof. See "Management--Benefit Plans" and Notes 7 and 12 to Notes to
    Financial Statements. Assumes the surrender of 52,223 shares of Common
    Stock in payment of the exercise price of certain warrants that will expire
    upon the closing of the offering, based on an assumed initial public
    offering price of $9.00 per share. To the extent the initial public
    offering price differs, the number of shares will vary. See "Description of
    Capital Stock--Warrants." Also gives effect to the repurchase of an
    additional 200,000 shares of Common Stock by the Company upon the closing
    of this offering using a portion of the net proceeds. See "Use of Proceeds"
    and "Certain Transactions--Settlement Agreement and Related Matters."     
 
                                       4
<PAGE>
 
                             SUMMARY FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>   
<CAPTION>
                                                                    TWELVE   THREE MONTHS    SIX MONTHS
                                                                    MONTHS       ENDED         ENDED
                               YEARS ENDED SEPTEMBER 30,            ENDED    DECEMBER 31,     JUNE 30,
                         ----------------------------------------  DEC. 31,  ------------- ---------------
                          1991     1992    1993    1994    1995    1995(1)    1994   1995   1995    1996
                         -------  ------  ------  ------- -------  --------  ------ ------ ------  -------
<S>                      <C>      <C>     <C>     <C>     <C>      <C>       <C>    <C>    <C>     <C>
STATEMENT OF OPERATIONS
 DATA:
 Revenues............... $ 1,174  $2,988  $6,986  $13,398 $19,350  $20,347   $5,515 $6,512 $9,003  $13,263
 Income (loss) from
  operations............  (1,125)   (623)    130    1,207  (1,607)  (1,806)     586    387 (1,331)     692
 Net income (loss)......  (1,202)   (753)   (125)     950  (2,433)  (2,773)     412     72 (1,736)     303
 Pro forma net income
  (loss) per common
  share(2)..............                                  $ (0.19)                  $ 0.01         $  0.02
 Pro forma weighted
  average number of
  common and common
  equivalent shares
  outstanding(2)........                                   12,614                   13,115          13,747
</TABLE>    
 
<TABLE>   
<CAPTION>
                                                           JUNE 30, 1996
                                                     ---------------------------
                                                                        AS
                                                     ACTUAL       ADJUSTED(2)(3)
                                                     -------      --------------
<S>                                                  <C>          <C>
BALANCE SHEET DATA:
 Cash and cash equivalents.......................... $ 3,532         $25,344
 Working capital....................................   2,420          25,845
 Total assets.......................................  14,555          36,367
 Long-term obligations, less current portion........   2,694           2,581
 Redeemable preferred stock.........................   9,226             --
 Stockholders' equity (deficiency)..................  (4,153)         28,611
</TABLE>    
- --------
(1) The Company changed its fiscal year from September 30 to December 31,
    effective with the fiscal year ending December 31, 1996. All references to
    fiscal years are to years ended September 30.
(2) Adjusted to give effect to the conversion of all outstanding shares of
    Convertible Preferred Stock into 5,247,324 shares of Common Stock. The
    Company has never declared or paid any cash dividends on its Common Stock.
   
(3) Adjusted to reflect the sale of 3,021,868 shares of Common Stock offered by
    the Company hereby at an assumed initial public offering price of $9.00 per
    share, after deducting estimated underwriting discounts and commissions and
    offering expenses, the application of the net proceeds thereof and the
    payment by the Company of cash to purchase Common Stock from and settle
    certain obligations with an existing stockholder subsequent to June 30,
    1996. See "Use of Proceeds" and "Capitalization."     
 
                                ----------------
 
  This Prospectus contains forward-looking statements which involve risks and
uncertainties. The Company's actual results may differ significantly from the
results discussed in the forward-looking statements. Factors that might cause
such a difference include, but are not limited to, those discussed in "Risk
Factors."
 
  PROFILE is a registered trademark of the Company, and ALLEGRO, CAS COMM,
CHANNEL WIZARD, CHURN PROPHET, CREDIT DECISION SYSTEM, CUSTOMER ACQUISITION
SYSTEM, 800-FOR-CREDIT, FRAUD SENTINEL, INSIGHT, IRIS, LIGHTBRIDGE, POPS,
POSTALPRO, SAMS and WIRELESS INTELLIGENCE are trademarks of the Company. All
other trademarks or trade names referred to in this Prospectus are the property
of their respective owners.
 
                                       5
<PAGE>
 
                                 RISK FACTORS
 
  An investment in the shares of Common Stock offered hereby involves a high
degree of risk. This Prospectus contains certain forward-looking statements.
Actual results could differ materially from those projected in the forward-
looking statements as a result of certain of the risk factors set forth below
and elsewhere in this Prospectus. In addition to the other information in this
Prospectus, prospective investors should carefully consider the following risk
factors in evaluating an investment in the Company and its business before
purchasing any shares of Common Stock offered hereby.
   
  Dependence on Limited Number of Clients. A limited number of clients
historically have accounted for a substantial portion of the Company's
revenues in each fiscal year. Revenues attributable to the Company's 10
largest clients accounted for approximately 85%, 90% and 90% of the Company's
total revenues in the years ended September 30, 1993, 1994 and 1995,
respectively. Four clients each accounted for greater than 10% of the
Company's total revenues in the years ended September 30, 1994 and 1995. One
of these clients, which uses the call center support solutions provided by the
Company's Teleservices Group and accounted for 10% of the Company's revenues
in the year ended September 30, 1995, has notified the Company of its intent
to terminate its agreements with the Company, effective in the fourth calendar
quarter of 1996. During 1996, another of these clients, which accounted for
31% of the Company's revenues in the fiscal year ended September 30, 1995, is
changing the way it accesses the Company's Customer Acquisition System, from
using the call center support solutions provided by the Teleservices Group to
using on-line access. As a result, the Company expects the revenues from this
client to decrease significantly during 1996 and 1997. The Company believes
that the termination of these agreements by one client, and the change in the
services used by another client, will not have a material adverse effect on
its business, financial condition, results of operations or cash flow. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations--Overview." The concentration of the Company's revenues can cause
the Company's revenues and earnings to fluctuate significantly from quarter to
quarter, based on the volume of qualification and activation transactions
generated through its significant clients. Moreover, recent consolidation
among established participants in the wireless telecommunications industry may
result in further concentration of the Company's revenues from a limited
number of clients. The Company expects that revenues attributable to a
relatively small number of clients will continue to represent a significant
percentage of its total revenues for the foreseeable future. The Company's
contracts with its clients generally extend for terms of one or more years and
do not typically require the clients to purchase any particular type or
quantity of the Company's products or services or to pay any minimum amount
for products or services. Therefore, there can be no assurance that any of the
Company's clients, including its significant clients, will continue to utilize
the Company's services at levels similar to previous years or at all. The loss
of, or a significant curtailment of purchases by, one or more of the Company's
significant clients, including a loss or curtailment due to factors outside of
the Company's control, could have a material adverse effect on the Company's
business, financial condition, results of operations and cash flow. In
addition, delays in collection or uncollectability of accounts receivable from
any of the Company's significant clients could have a material adverse effect
on the Company's liquidity and working capital position. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations" and
"Business--Clients."     
 
  Fluctuations in Quarterly Performance May Adversely Affect Market Price of
Common Stock. The Company has experienced fluctuations in its quarterly
operating results and anticipates that such fluctuations will continue and
could intensify. The Company's quarterly operating results may vary
significantly depending on a number of factors, including the timing of the
introduction or acceptance of new products and services offered by the Company
or its competitors, changes in the mix of products and services provided by
the Company, the nature and timing of changes in the Company's clients or
their use of the Company's products and services, consolidation among
participants and other changes in the wireless telecommunications industry,
changes in the client markets served by the Company, changes in regulations
affecting the wireless industry, changes in the Company's operating expenses,
changes in personnel and changes in general economic conditions. Historically,
the Company's quarterly revenues have been highest in the fourth quarter of
each calendar year and have been particularly concentrated in the holiday
shopping season between Thanksgiving and Christmas. The Company's
 
                                       6
<PAGE>
 
transaction revenues, which historically have represented substantially all of
the Company's total revenues, are affected by the volume of use of the
Company's services, which is influenced by seasonal and retail trends, the
success of the carriers utilizing the Company's services in attracting
subscribers and the markets served by the Company for its clients. Software
and other revenues, which include software license revenues and related
consulting revenues, have recently represented an increasing proportion of the
Company's total revenues. Software license revenues are principally recognized
at the time of delivery of the licensed products and therefore may result in
further fluctuations in the Company's quarterly operating results. Consulting
revenues may be influenced by the requirements of one or more of the Company's
significant clients, including engagement of the Company for implementing or
assisting in implementing special projects of limited duration. During the
three months ended June 30, 1996, the Company's revenues from customized
software integration services resulted primarily from projects undertaken for
one client, which projects the Company currently expects will continue at
least through the end of 1996. There can be no assurance that the Company will
be able to achieve or maintain profitability in the future or that its levels
of profitability will not vary significantly among quarterly periods.
Fluctuations in operating results may result in volatility in the price of the
Company's Common Stock.
 
  Although the Company's existing clients typically provide forecasts of
future activity levels, these forecasts have not always proved accurate. In
addition, the sales cycles for the Company's services are typically lengthy
and subject to a number of significant risks over which the Company has little
or no control, including clients' budget constraints and internal
authorization reviews. As a result, the Company may not be able to make
accurate estimates of future sales levels. A significant portion of the
Company's expenses are fixed and difficult to reduce in the event revenues do
not meet the Company's expectations, thus magnifying the adverse effect of any
revenue shortfall. Furthermore, announcements by the Company or its
competitors of new products, services or technologies could cause clients to
defer or cancel purchases of the Company's products and services; any such
deferral or cancellation could have a material adverse effect on the Company's
business, financial condition, results of operations and cash flow.
Accordingly, revenue shortfalls can cause significant variations in operating
results from quarter to quarter and could have a material adverse effect on
the Company's results of operations. If demand for the Company's services
significantly exceeds the Company's estimates at a time when its systems are
used at or near capacity, however, the Company may be unable to meet
contractually required service levels. The Company's failure to meet such
service levels could permit clients to terminate their agreements with the
Company or give rise to liability for damages or penalties, either of which
could have a material adverse effect on the Company's business, financial
condition, results of operations and cash flow. In addition, the Company has
hired a significant number of employees since January 1995 and expects to
continue hiring additional sales, customer service, management, software
development and technical support employees during the remainder of 1996 as it
continues to develop and expand its operations. This significant increase in
its workforce may negatively impact the Company's operating margins in the
future, particularly if the Company's commercial introduction of new products
and services is not as successful as planned.
 
  Due to all of the foregoing factors, it is possible that in some future
quarter the Company's results of operations will be below prior results or the
expectations of market analysts and investors. In such an event, the price of
the Company's Common Stock would likely be materially adversely affected.
 
  History of Losses; Capital Requirements. The Company was founded in 1989 and
has incurred net losses in each of its fiscal years other than the year ended
September 30, 1994. As of June 30, 1996, the Company had an accumulated
deficit of approximately $4.0 million. No assurance can be given that the
Company will be profitable on either a quarterly or annual basis in the future
or that the Company will not need to raise additional funds through public or
private financings. Expansion of the Company's business, including the
acquisition of additional computer and network equipment and the expansion of
its teleservices call center capacity, will require the Company to make
significant capital expenditures. The Company believes that its net proceeds
of this offering, together with existing cash balances and funds available
under existing lines of credit, will be sufficient to finance the Company's
operations and capital expenditures for at least the next twelve months. In
the event that the Company's plans change or if the proceeds of this offering
or available cash resources otherwise prove to be insufficient (due to
unanticipated expenses or otherwise), the Company may be required to seek
additional financing or curtail its expansion activities. The Company may
determine, depending upon the opportunities available to it, to seek
additional debt or equity financing to fund the cost of continuing expansion.
To the extent
 
                                       7
<PAGE>
 
that the Company obtains equity financing or finances an acquisition with
equity securities, any such issuance of equity securities could result in
dilution to the interests of the Company's stockholders. There can be no
assurance that additional financing will be available to the Company on
acceptable terms, or at all. See "Use of Proceeds" and "Management's
Discussion and Analysis of Financial Condition and Results of Operations."
 
  Rapid Industry Change Requires Ongoing Product Development Efforts. The
wireless telecommunications industry has been changing rapidly as a result of
increasing competition, technological advances and evolving industry practices
and standards, and the Company expects these changes to continue. Carriers in
the wireless market have also been changing quickly, as the result of
consolidation among established carriers and the rapid entrance of new
carriers into the market. The Company's future success will depend on the
continued use of its
existing products and services, market acceptance of its new products and
services and the Company's ability to develop and market new offerings or
adapt existing offerings to keep pace with changes in the wireless
telecommunications industry. A rapid shift away from the use of cellular in
favor of other telecommunications services, such as PCS, could affect demand
for the Company's product and service offerings, since different business
practices might evolve with respect to the offering and sale of new
telecommunications services and could require the Company to develop modified
or alternate offerings addressing the particular needs of providers of the new
telecommunications services. In addition, as the cost of wireless
communication services declines and the number of subscribers increases,
carriers may elect to forego credit verification of new customers, and it is
unclear what means of customer screening, if any, carriers will employ if they
do not use credit verification.
 
  Due to rapid changes in the wireless telecommunications industry, the
Company intends to continue to devote substantial financial, managerial and
personnel resources to product development efforts for the foreseeable future.
The development of the Company's product and service offerings is based on a
complex process requiring high levels of innovation and the accurate
anticipation of technological and market trends. There can be no assurance
that the Company will be successful in developing or marketing its existing or
future product and service offerings in a timely manner, or at all. If the
Company is unable, due to resource, technical or other constraints to
anticipate or respond adequately to changing market, client or technological
requirements, the Company's business, financial condition, results of
operations and cash flow will be materially adversely affected. There can be
no assurance that products or services developed by others will not render the
Company's products or services non-competitive or obsolete. See "Business--
Industry Overview" and "--Competition."
 
  Risks Associated with Managing a Changing Business. The Company has expanded
its operations rapidly, and this expansion has created significant demands on
the Company's executive, operational, development and financial personnel and
other resources. Additional expansion by the Company, including geographic
expansion, may further strain the Company's management, financial and other
resources. There can be no assurance that the Company's systems, procedures,
controls and existing space will be adequate to support expansion of the
Company's operations. The Company's future operating results will depend on
the ability of its officers and key employees to manage changing business
conditions and to continue to improve its operational and financial control
and reporting systems. If the Company's management is unable to manage growth
effectively, its business, financial condition, results of operations and cash
flow could be materially and adversely affected. See "Business--Employees" and
"Management."
 
  The success of the Company's business depends in part upon the Company's
ability to attract, train and retain a sufficient number of qualified
personnel to meet its needs. The Company's teleservices call center is labor
intensive; consequently, an increase in the turnover rate among the Company's
teleservices employees would increase the Company's recruiting and training
costs, and if the Company were unable to recruit and retain a sufficient
number of these employees, it could be forced to limit its growth or possibly
curtail its operations. There can be no assurance that the Company will be
successful in attracting, training and retaining the required number of
employees to support the Company's business in the future. See "Business--
Products and Services."
   
  Dependence on Key Personnel. The Company's success to date has depended to a
significant extent on Pamela D.A. Reeve, its President and Chief Executive
Officer, and a number of other key personnel. With the exception of Ms. Reeve,
none of the Company's personnel is a party to an employment agreement with the
Company. The loss of the services of Ms. Reeve or any of the Company's other
key personnel could have a     
 
                                       8
<PAGE>
 
material adverse effect on the Company's business, financial condition,
results of operations and cash flow. The Company believes that its future
success will depend in large part on its ability to attract and retain highly
qualified management, engineering, research and development, sales and
operational personnel. In particular, the Company will need to hire additional
software developers in order to support and increase its software licensing
activities. Competition for all of these personnel is intense and there can be
no assurance that the Company will be successful in attracting and retaining
key personnel. The failure of the Company to hire and retain qualified
personnel could have a material adverse effect upon the Company's business,
financial condition, results of operations and cash flow. After the closing of
this offering, the Company will not maintain key person life insurance
policies on any of its employees other than Ms. Reeve. See "Business--
Employees" and "Management."
 
  Dependence on Cellular Market and Emerging Wireless Markets. The Company
historically has provided its products and services predominantly to cellular
carriers. Although the cellular market has experienced significant growth in
recent years, there can be no assurance that such growth will continue at
similar rates, or at all, or that cellular carriers will continue to use the
Company's products and services. Further growth in the Company's revenues from
use of the Company's Customer Acquisition System by cellular carriers is more
likely to result from expansion into additional geographic markets for its
existing clients and from general growth of the cellular market, if any, than
from the addition of new cellular carrier clients. Declines in demand for the
Company's products and services, whether as a result of competition,
technological change, industry change, general economic conditions or other
factors, could have a material adverse effect on the Company's business,
financial condition, results of operations and cash flow.
 
  The Company's future operating results will depend in part on the emergence
of the PCS market and other wireless telecommunications markets and the use of
the Company's products and services by PCS and other wireless carriers. The
PCS market is in its initial stages of development. If the growth of the PCS
market or other new wireless markets does not meet expectations or is
significantly delayed for any reason, or if carriers in these markets do not
use the Company's products and services, the Company's business, financial
condition, results of operations and cash flow could be materially and
adversely affected. See "Business--Industry Overview" and "--Products and
Services."
 
  Highly Competitive Industry. The market for products and services provided
to wireless carriers is highly competitive and subject to rapid change. The
market is fragmented, and a number of companies currently offer one or more
products or services competitive with those offered by the Company. In
addition, many wireless carriers are providing or can provide, internally,
products and services competitive with those the Company offers. Trends in the
wireless telecommunications industry, including greater consolidation and
technological or other developments that make it simpler or more cost-
effective for wireless carriers to provide certain services themselves, could
affect demand for the Company's services and could make it more difficult for
the Company to offer a cost-effective alternative to a wireless carrier's own
capabilities. In addition, the Company anticipates continued growth in the
wireless carrier services industry and, consequently, the entrance of new
competitors in the future.
 
  The Company believes that the principal competitive factors in the wireless
carrier services industry include the ability to identify and respond to
subscriber needs, quality and breadth of service offerings, price and
technical expertise. The Company believes that its ability to compete also
depends in part on a number of competitive factors outside its control,
including the ability to hire and retain employees, the development by others
of products and services that are competitive with the Company's products and
services, the price at which others offer comparable products and services and
the extent of its competitors' responsiveness to customer needs.
 
  Many of the Company's current and potential competitors have significantly
greater financial, marketing, technical and other competitive resources than
the Company. As a result, the Company's competitors may be able to adapt more
quickly to new or emerging technologies and changes in customer requirements
or may be able to devote greater resources to the promotion and sale of their
products and services. There can be no assurance that the Company will be able
to compete successfully with its existing competitors or with new competitors.
In addition, competition could increase if new companies enter the market or
if existing competitors expand their service offerings. An increase in
competition could result in price reductions or the loss of market
 
                                       9
<PAGE>
 
share by the Company and could have a material adverse effect on the Company's
business, financial condition, results of operations and cash flow.
 
  To remain competitive in the wireless carrier services industry, the Company
will need to continue to invest in engineering, research and development and
sales and marketing. There can be no assurance that the Company will have
sufficient resources to make such investments or that the Company will be able
to make the technological advances necessary to remain competitive. In
addition, current and potential competitors have established or may in the
future establish collaborative relationships among themselves or with third
parties, including third parties with whom the Company has a relationship, to
increase the visibility and utility of their products and services.
Accordingly, it is possible that new competitors or alliances may emerge and
rapidly acquire a significant market share. If this were to occur, the
Company's business, financial condition, results of operations and cash flow
could be materially and adversely affected. See "Business--Competition."
 
  Risk of System Failure. The Company's operations are dependent upon its
ability to maintain its computer and telecommunications equipment and systems
in effective working order and to protect its systems against damage from
fire, natural disaster, power loss, telecommunications failure or similar
events. All of the Company's computer and telecommunications equipment is
located at its two sites in Waltham, Massachusetts, and, as a result, may be
vulnerable to a natural disaster. The Company has taken precautions to protect
itself and its clients from events that could interrupt delivery of the
Company's services. These precautions include physical security systems, back-
up and off site data storage, back-up telephone lines, service arrangements
with multiple long-distance telephone carriers and an on-site power generator.
Notwithstanding such precautions, there can be no assurance that a fire,
natural disaster, power loss, telecommunications failure or similar event
would not result in an interruption of the Company's services. From time to
time, the Company has experienced delays in the delivery of services to some
clients as a result of failures of certain of the Company's systems. In
addition, the growth of the Company's client base, a significant increase in
transaction volume or an expansion of the Company's facilities may strain the
capacity of its computers and telecommunications systems and lead to
degradations in performance or system failure. Many of the Company's
agreements with carriers contain level of service commitments which the
Company might be unable to fulfill in the event of a natural disaster or major
system failure. Any damage, failure or delay that causes interruptions in the
Company's operations could have a material adverse effect on the Company's
business, financial condition, results of operations and cash flow. Further,
any future addition or expansion of the Company's facilities to increase
capacity could increase the Company's exposure to damage from fire, natural
disaster, power loss, telecommunications failure or similar events. There can
be no assurance that the Company's property and business interruption
insurance will be adequate to compensate the Company for any losses that may
occur in the event of a system failure or that such insurance will continue to
be available to the Company at all or, if available, that it will be available
on commercially reasonable terms. See "Business--Products and Services."
 
  In addition to its own systems, the Company relies on certain equipment,
systems and services from third parties that are also subject to risks,
including risks of system failure or inadequacy. For example, in providing its
credit verification service, the Company is dependent on access to various
credit information data bases. Similarly, delivery of the Company's activation
services is often dependent on the availability and performance of third-party
billing systems. If, for any reason, the Company were unable to access any
such data bases or third-party billing systems, the Company's ability to
process credit verification transactions could be impaired. In addition, the
Company's business is materially dependent on service provided by various
local and long distance telephone companies. A significant increase in the
cost of telephone services that is not recoverable through an increase in the
price of the Company's services, or any significant interruption in telephone
services, could have a material adverse effect on the Company's business,
financial condition, results of operations and cash flow.
 
  Risk of Software Defects; Dependence on Third-Party Software. The software
developed and utilized by the Company in providing its products and services
may contain errors. Although the Company engages in extensive testing of its
software before it is used to provide services to clients, there can be no
assurance that errors will not be found in software after commencement of the
use of such software. Any such error may result
 
                                      10
<PAGE>
 
in the Company's partial or total inability to provide services to its
clients, additional and unexpected expenses to fund further product
development or to add programming personnel to complete a development project,
or loss of revenue because of the inability of clients to use the Company's
products or services or the termination by clients of their arrangements with
the Company. Any of these results could have a material adverse effect on the
Company's business, financial condition, results of operations and cash flow.
 
  Certain software used in the Company's software products and to support the
Company's qualification and activation services is licensed by the Company
from third parties. The Company licenses software from Pilot Software, Inc.
under a license agreement that will expire in December 2000 and licenses
software from Trans Union Corporation under a one-year renewable agreement.
There can be no assurance that these suppliers will continue to license this
software to the Company or, if any supplier terminates its agreement with the
Company, that the Company will be able to develop or otherwise procure
software from another supplier on a timely basis or on commercially reasonable
terms. Even if the Company succeeds in developing or procuring such software
in such circumstances, there can be no assurance that the Company will be able
to do so in a timely fashion. See "Business--Proprietary Rights."
 
  Risks Associated with Potential Acquisitions. The Company may in the future
pursue acquisitions of companies, technologies or assets that complement the
Company's business. Future acquisitions may result in the potentially dilutive
issuance of equity securities, the incurrence of additional debt, the write-
off of in-process research and development or software acquisition and
development costs and the amortization of expenses related to goodwill and
other intangible assets, any of which could have a material adverse effect on
the Company's business, financial condition, results of operations and cash
flow. Future acquisitions would involve numerous additional risks, including
difficulties in the assimilation of the operations, services, products and
personnel of the acquired company, the diversion of management's attention
from other business concerns, entering markets in which the Company has little
or no direct prior experience and the potential loss of key employees of the
acquired company. The Company currently has no agreements or understandings
with regard to any acquisition.
 
  Government Regulation and Legal Uncertainties. The wireless carriers that
constitute the Company's clients are regulated at both the federal and state
levels. Federal and state regulation may decrease the growth of the wireless
telecommunications industry, affect the development of the PCS or other
wireless markets, limit the number of potential clients for the Company's
services, impede the Company's ability to offer competitive services to the
wireless telecommunications market, or otherwise have a material adverse
effect on the Company's business, financial condition, results of operations
and cash flow. The Telecommunications Act of 1996, which in large measure
deregulated the telecommunications industry, has caused, and is likely to
continue to cause, significant changes in the industry, including the entrance
of new competitors, consolidation of industry participants and the
introduction of bundled wireless and wireline services. Those changes could in
turn subject the Company to increased pricing pressures, decrease the demand
for the Company's products and services, increase the Company's cost of doing
business or otherwise have a material adverse effect on the Company's
business, financial condition, results of operations and cash flow.
 
  As the result of offering its ProFile product, the Company is subject to the
requirements of the Fair Credit Reporting Act and certain state laws. Although
the Company's business activities are not otherwise within the scope of
federal or state regulations applicable to credit bureaus and financial
institutions, the Company must take into account such regulations in order to
provide products and services that help its clients comply with such
regulations. The Company monitors regulatory changes and implements changes to
its products and services as appropriate. Although the Company attempts to
protect itself by written agreements with its clients, failure to reflect the
provisions of such regulations in a timely or accurate manner could possibly
subject the Company to liabilities that could have a material adverse effect
on the Company's business, financial condition, results of operations and cash
flow. See "Business--Government Regulation."
 
  Limited Protection of Proprietary Technology; Risk of Third Party
Claims. The Company's success is dependent upon proprietary technology. The
Company currently has no patents and protects its property rights in its
technology primarily through copyrights, the law of trademarks, trade secrets
and employee and third-party
 
                                      11
<PAGE>
 
non-disclosure agreements. There can be no assurance that the steps taken by
the Company to protect its proprietary rights will be adequate to prevent
misappropriation of its technology or independent development by others of
similar technology. In addition, the laws of some foreign countries do not
protect the Company's proprietary rights to the same extent as do the laws of
the United States. There can be no assurance that these protections will be
adequate.
 
  Although the Company believes that its products and technology do not
infringe on any existing proprietary rights of others, there can be no
assurance that third parties will not assert such claims against the Company
in the future or that such future claims will not be successful. The Company
could incur substantial costs and diversion of management resources with
respect to the defense of any claims relating to proprietary rights, which
could have a material adverse effect on the Company's business, financial
condition, results of operations and cash flow. Furthermore, parties making
such claims could secure a judgment awarding substantial damages, as well as
injunctive or other equitable relief, which could effectively block the
Company's ability to make, use, sell, distribute or market its products and
services in the United States or abroad. Such a judgment could have a material
adverse effect on the Company's business, financial condition, results of
operations and cash flow. In the event a claim relating to proprietary
technology or information is asserted against the Company, the Company may
seek licenses to such intellectual property. There can be no assurance,
however, that such a license could be obtained on commercially reasonable
terms, if at all, or that the terms of any offered licenses will be acceptable
to the Company. The failure to obtain the necessary licenses or other rights
could preclude the sale, manufacture or distribution of the Company's products
and, therefore, could have a material adverse effect on the Company's
business, financial condition, results of operations and cash flow. The cost
of responding to any such claim may be material, whether or not the assertion
of such claim is valid. See "Business--Proprietary Rights."
 
  Risks Associated with International Expansion. As part of its business
strategy, the Company may seek opportunities to expand its offerings into
international markets. The Company does not currently derive any revenues from
international markets. The Company believes that such expansion is important
to the Company's ability to continue to grow and to market its products and
services. In particular, some domestic wireless carriers expanding into
international markets may seek single, global solutions from the Company and
its competitors, and as a result, the inability of the Company to offer its
products and services internationally may have an adverse effect on the
Company's ability to market its products and services to those carriers for
use in the United States. In marketing its products and services
internationally, however, the Company will face new competitors, some of whom
may have established strong relationships with carriers. There can be no
assurance that the Company will be successful in marketing or distributing its
services abroad or that, if the Company is successful, its international
revenues will be adequate to offset the expense of establishing and
maintaining international operations. To date, the Company has no experience
in marketing and distributing its services internationally. In addition to the
uncertainty as to the Company's ability to establish an international
presence, there are certain difficulties and risks inherent in doing business
on an international level, such as compliance with regulatory requirements and
changes in these requirements, export restrictions, export controls relating
to technology, tariffs and other trade barriers, difficulties in staffing and
managing international operations, longer payment cycles, problems in
collecting accounts receivable, political instability, fluctuations in
currency exchange rates, seasonal reductions in business activity during the
summer months in Europe and certain other parts of the world and potentially
adverse tax consequences. There can be no assurance that one or more of such
factors will not have a material adverse effect on any international
operations established by the Company and, consequently, on the Company's
business, financial condition, results of operations and cash flow. See
"Business--Strategy."
 
  Absence of Public Market; Possible Volatility of Stock Price. Prior to this
offering, there has been no public market for the Common Stock, and there can
be no assurance that an active trading market will develop or be sustained
after the offering. The initial public offering price of the Common Stock will
be determined through negotiations between the Company and the Representatives
of the Underwriters and may not be indicative of the market price for the
Common Stock after the offering. For a description of the factors to be
considered in determining the public offering price, see "Underwriting."
Factors such as announcements of technological innovations or new products by
the Company, its competitors and other third parties, as well as
 
                                      12
<PAGE>
 
quarterly variations in the Company's results of operations and market
conditions in the industry, may cause the market price of the Common Stock to
fluctuate significantly. In addition, the stock market in general has
experienced substantial price and volume fluctuations, which have particularly
affected the market prices of many technology companies and which have often
been unrelated to the operating performance of such companies. These broad
market fluctuations may adversely affect the market price of the Common Stock.
   
  Control by Existing Stockholders May Discourage Change of Control. After the
sale of the shares of Common Stock offered hereby and the application of the
net proceeds thereof, the Company's executive officers, directors and 5%
stockholders will own beneficially an aggregate of 9,957,488 shares or
approximately 62.2% of the outstanding shares of Common Stock. As a result,
these stockholders, if acting together, would be able to control matters
requiring the approval of stockholders of the Company, including the election
of directors. This concentration of ownership by existing stockholders may
also have the effect of delaying or preventing a change in control of the
Company. See "Principal and Selling Stockholders."     
   
  Shares Eligible for Future Sale; Possible Adverse Effect on Market
Price. Sales of a substantial number of shares of Common Stock into the public
market following this offering could adversely affect the prevailing market
price of the Common Stock and the Company's ability to raise capital in the
future. Upon completion of this offering, the Company will have a total of
14,530,377 shares of Common Stock outstanding, of which the 3,800,000 shares
offered hereby will be freely tradable without restriction under the
Securities Act of 1933, as amended (the "Securities Act") by persons other
than "affiliates" of the Company, as defined under the Securities Act. The
remaining 10,730,377 shares of Common Stock outstanding are "restricted
securities" as that term is defined by Rule 144 and Rule 701 as promulgated
under the Securities Act (the "Restricted Shares"). Of the 10,730,377
Restricted Shares, 8,572,487 shares may be sold under Rule 144, subject in
some cases to certain volume restrictions and other conditions imposed
thereby. An additional 95,390 shares will become eligible for sale 90 days
after completion of the offering pursuant to Rules 144 and 701. The remaining
2,062,500 shares will be eligible for sale upon the expiration of their
respective two-year holding periods subject to the conditions of Rule 144,
such holding periods to expire on April 3, 1998 for 2,000,000 shares and on
June 30, 1998 for 62,500 shares. The Commission has proposed certain
amendments to Rule 144 that would reduce by one year the holding periods
required for shares subject to Rule 144 to become eligible for resale in the
public market. This proposal, if adopted, would permit earlier resale of
shares of Common Stock currently subject to holding periods under Rule 144. No
assurance can be given concerning whether or when the proposal will be adopted
by the Commission. Furthermore, all of the 10,730,377 Restricted Shares are
subject to lock-up agreements expiring 180 days following the date of this
Prospectus. Such agreements provide that Cowen & Company may, in its sole
discretion and at any time without notice, release all or a portion of the
shares subject to these lock-up agreements. Upon the expiration of the lock-up
agreements, 8,667,877 of the 10,730,377 Restricted Shares may be sold pursuant
to Rules 144 or 701, subject in some cases to certain volume restrictions
imposed thereby. Certain existing stockholders have rights to include shares
of Common Stock owned by them in future registrations by the Company for the
sale of Common Stock or to request that the Company register their shares
under the Securities Act. See "Shares Eligible for Future Sale--Registration
Rights." Following the date of this Prospectus, the Company intends to
register on one or more registration statements on Form S-8 approximately
3,393,786 shares of Common Stock issued or issuable under its stock option
plans and 100,000 shares of Common Stock issuable under its employee stock
purchase plan. Of the 2,615,800 shares issuable under its option plans,
1,615,800 shares were subject to outstanding options as of August 26, 1996, of
which 770,555 options were exercisable within 180 days following the date of
this Prospectus. Shares covered by such registration statements will be
eligible for sale in the public market after the effective date of such
registration. See "Management--Benefit Plans" and "Shares Eligible for Future
Sale."     
 
  Management's Discretion as to Use of Unallocated Net Proceeds. The principal
purposes of this offering are to increase the Company's equity capital, to
create a public market for the Common Stock, to facilitate future access by
the Company to public equity markets and to provide liquidity for the
Company's existing stockholders. As of the date of this Prospectus, the
Company has no specific plans for the use of a substantial portion of the net
proceeds of this offering. The Company expects to use such unallocated
proceeds for working
 
                                      13
<PAGE>
 
capital and other general corporate purposes, including potential
acquisitions. Consequently, the Board of Directors and management of the
Company will have significant flexibility in applying the net proceeds of this
offering. See "Use of Proceeds."
   
  Benefits of the Offering to Current Stockholders. The completion of the
offering made by this Prospectus will provide significant benefits to the
current stockholders of the Company, including certain of its directors and
officers. The Company will not receive any of the proceeds from the sale of
shares by the Selling Stockholders. In addition, the Company intends to use
approximately $927,000 of the net proceeds of this offering to repurchase
shares of Common Stock from, and repay indebtedness outstanding under
promissory notes held by, a greater-than-5% stockholder of the Company. See
"Use of Proceeds" and "Certain Transactions." The completion of this offering
will also create a public market for the Common Stock and thereby is expected
to increase the market value of the investment by current stockholders in the
Company. Upon the closing of this offering, assuming an initial public
offering price of $10.00 per share (which represents the highest price in the
range of initial public offering prices set forth on the front cover of this
Prospectus), the difference between the aggregate purchase price paid or
payable by the Company's current securityholders for shares of Common Stock
held by them or subject to options or warrants held by them and the aggregate
market value of such shares will be approximately $127 million. See
"Dilution."     
 
  Anti-Takeover Effect of Charter Provisions, By-Laws and Delaware Law. The
Company's Amended and Restated Certificate of Incorporation (the "Restated
Charter") and Amended and Restated By-Laws (the "Restated By-Laws") will
contain provisions that could discourage a proxy contest or make more
difficult the acquisition of a substantial block of the Company's Common
Stock. The Restated Charter requires that any action required or permitted to
be taken by stockholders of the Company must be effected at a duly called
annual or special meeting of stockholders and may not be effected by any
consent in writing. The Restated By-Laws require specified advance notice by a
stockholder of a proposal or director nomination which such stockholder
desires to present at any annual or special meeting of stockholders. Special
meetings of stockholders may be called only by the President or a majority of
the Board of Directors. The Restated By-Laws provide for a classified Board of
Directors, and members of the Board of Directors may be removed only for cause
upon the affirmative vote of holders of at least two-thirds of the shares of
capital stock of the Company issued and outstanding and entitled to vote. The
affirmative vote of the holders of at least 75% of the shares of capital stock
of the Company issued and outstanding and entitled to vote is required to
amend or repeal these provisions. In addition, the Board of Directors is
authorized to issue shares of Common Stock and Preferred Stock which, if
issued, could dilute and adversely affect various rights of the holders of
Common Stock and, in addition, could be used to discourage an unsolicited
attempt to acquire control of the Company.
 
  Following this offering, the Company will become subject to the anti-
takeover provisions of Section 203 of the Delaware General Corporation Law,
which will prohibit the Company from engaging in a "business combination" with
an "interested stockholder" for a period of three years after the date of the
transaction in which the person became an interested stockholder, unless the
business combination is approved in a prescribed manner. The application of
Section 203 may limit the ability of stockholders to approve a transaction
that they deem to be in their best interests. The foregoing and other
provisions of the Restated Charter and the Restated By-Laws and the
application of Section 203 of the Delaware General Corporation Law could have
the effect of deterring certain takeovers or delaying or preventing certain
changes in control or management of the Company, including transactions in
which stockholders might otherwise receive a premium for their shares over
then current market prices. See "Description of Capital Stock--Preferred
Stock" and "--Anti-Takeover Effects of Provisions of the Restated Charter and
By-Laws and of Delaware Law."
 
  Immediate and Future Dilution. Purchasers in the offering will experience
immediate and substantial dilution in the net tangible book value per share of
the Common Stock from the initial public offering price. Additional dilution
will occur upon the exercise of outstanding stock options and warrants. See
"Dilution" and "Management--Benefit Plans."
 
                                      14
<PAGE>
 
                                USE OF PROCEEDS
   
  The net proceeds to the Company of the sale of the 3,021,868 shares of
Common Stock offered by the Company hereby at an assumed initial public
offering price of $9.00 per share are estimated to be $24,443,035, after
deducting the estimated underwriting discounts and commissions and offering
expenses payable by the Company. The principal purposes of this offering are
to increase the Company's equity capital, to create a public market for the
Common Stock, to facilitate future access by the Company to public equity
markets and to provide liquidity for the Company's existing stockholders.     
   
  The Company intends to use a portion of the net proceeds of this offering to
repay all of the indebtedness outstanding under its working capital bank line
of credit at the time this offering is completed (approximately $1,500,000 was
outstanding at August 26, 1996). The Company's working capital line of credit,
which provides for borrowings up to $4,000,000, bears interest at the lending
bank's prime rate plus .25% (8.5% at August 26, 1996). The working capital
line of credit is secured by a pledge of the accounts receivable, equipment
and intangible assets of the Company and terminates in June 1997. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations--Liquidity and Capital Resources."     
   
  The Company also intends to use $440,000 of the net proceeds of this
offering to repurchase an aggregate of 200,000 shares of Common Stock pursuant
to options granted to the Company in connection with the settlement of certain
litigation. In addition, the Company intends to use approximately $487,000 of
the net proceeds of this offering to repay indebtedness outstanding under two
8% promissory notes issued in partial payment of the exercise prices of
options to acquire 400,000 shares of Common Stock. One promissory note was
issued in April 1996 and matures in two equal installments in April 1997 and
1998. The other promissory note is to be issued on or before September 3, 1996
and will mature in two equal installments on the first and second
anniversaries of the date of issuance. See "Certain Transactions."     
 
  The Company intends to use the remainder of the net proceeds of this
offering for working capital and other general corporate purposes. In
addition, the Company may use a portion of the net proceeds of this offering
to acquire or invest in companies, technologies or assets that complement the
Company's business. While from time to time the Company may evaluate potential
acquisitions or investments, the Company is not currently involved in
negotiations with respect to, and has no agreement or understanding regarding,
any such acquisition or investment. Pending such uses, the Company intends to
invest the net proceeds in short-term, investment-grade, interest-bearing
securities. See "Risk Factors--Management's Discretion as to Use of
Unallocated Net Proceeds" and "--Risks Associated with Potential
Acquisitions."
 
  The Company will not receive any proceeds from the sale of shares of Common
Stock offered by the Selling Stockholders hereby. See "Principal and Selling
Stockholders."
 
                                DIVIDEND POLICY
 
  The Company has never declared or paid any cash dividends on its capital
stock. The Company currently anticipates that it will retain future earnings,
if any, to fund the development and growth of its business and therefore does
not expect to pay any cash dividends in the foreseeable future. The terms of
the Company's existing borrowing arrangements and bank lines of credit
prohibit the Company from declaring or paying cash dividends on the Common
Stock. See "Management's Discussion and Analysis of Financial Condition and
Results of Operation--Liquidity and Capital Resources."
 
                                      15
<PAGE>
 
                                CAPITALIZATION
   
  The following table sets forth the capitalization of the Company as of June
30, 1996 (i) on an actual basis and (ii) as adjusted to reflect the issuance
and sale by the Company of 3,021,868 shares of Common Stock offered hereby (at
an assumed initial offering price of $9.00 per share, after deducting the
estimated underwriting discounts and commissions and expenses payable by the
Company), the application of the estimated net proceeds thereof, the payment
of cash to purchase Common Stock from and settle certain obligations with an
existing stockholder subsequent to June 30, 1996 the conversion of all
outstanding shares of Convertible Preferred Stock into Common Stock and the
filing of the Restated Charter. The following table should be read in
conjunction with the Financial Statements and Notes thereto included elsewhere
in this Prospectus.     
 
<TABLE>   
<CAPTION>
                                                               JUNE 30, 1996
                                                            -------------------
                                                                          AS
                                                              ACTUAL   ADJUSTED
                                                            ---------- --------
                                                               (IN
                                                            THOUSANDS)
<S>                                                         <C>        <C>
Total long-term obligations, less current portion..........  $ 2,694   $ 2,581
                                                             -------   -------
Redeemable convertible preferred stock and stockholders'
 equity:
 Redeemable convertible preferred stock, $.01 par value;
  2,475,516 shares authorized, 2,451,305 shares issued and
  outstanding, actual; no shares authorized, issued and
  outstanding, as adjusted.................................    9,226       --
 Preferred stock, $.01 par value; no shares authorized,
  issued or outstanding, actual; 5,000,000 shares
  authorized, no shares issued and outstanding, as
  adjusted.................................................      --        --
 Common stock, $.01 par value; 20,000,000 shares authorized
  and 6,256,120 shares outstanding, actual; 60,000,000
  shares authorized and 14,530,377 shares outstanding, as
  adjusted(1)..............................................       67       153
Additional paid-in capital.................................       75    33,658
Warrants...................................................      375       375
Notes receivable, stockholders.............................      (13)      (13)
Accumulated deficit........................................   (3,951)   (4,026)
Less treasury stock, at cost; 401,148 shares, actual;
 801,148 shares, as adjusted...............................     (706)   (1,536)
                                                             -------   -------
 Total redeemable convertible preferred stock and
  stockholders' equity.....................................    5,073    28,611
                                                             -------   -------
   Total capitalization....................................  $ 7,767   $31,192
                                                             =======   =======
</TABLE>    
- --------
   
(1) Excludes (i) 1,615,800 shares of Common Stock issuable upon exercise of
    stock options outstanding as of June 30, 1996, (ii) 1,000,000 shares of
    Common Stock reserved for future option grants under the Company's 1996
    Incentive and Nonqualified Stock Option Plan, (iii) 100,000 shares of
    Common Stock for issuance under the Company's 1996 Employee Stock Purchase
    Plan, (iv) 750,250 shares of Common Stock issuable upon exercise of
    warrants outstanding as of June 30, 1996 and (v) 100,000 shares of Common
    Stock issuable upon the exercise a warrant granted to an existing
    stockholder on August 26, 1996. See "Management--Benefit Plans," "Certain
    Transactions--Settlement Agreement and Related Matters" and Notes 7 and 12
    to Notes to Financial Statements.     
 
                                      16
<PAGE>
 
                                   DILUTION
   
  The pro forma net tangible book value of the Company as of June 30, 1996 was
$4,344,000, or $0.38 per share of Common Stock. Pro forma net tangible book
value per share represents the amount of the Company's tangible assets less
total liabilities, divided by the number of shares of Common Stock outstanding
after giving effect to the conversion of all outstanding shares of Convertible
Preferred Stock into Common Stock (which will occur upon the closing of this
offering). After giving effect to the sale of 3,021,868 shares of Common Stock
offered hereby by the Company at an assumed initial public offering price of
$10.00 per share (which represents the highest price in the range of initial
public offering prices set forth on the front cover of this Prospectus), the
Company's repurchase of 400,000 shares of Common Stock for an aggregate
purchase price of $830,000, the payment of $75,000 to a stockholder and after
deducting the estimated underwriting discounts and commissions and offering
expenses payable by the Company, the Company's pro forma as adjusted net
tangible book value at June 30, 1996 would have been $30,693,000, or $2.11 per
share. This represents an immediate increase in pro forma net tangible book
value of $1.73 per share to existing stockholders and an immediate dilution of
$7.89 per share to investors purchasing shares of Common Stock in this
offering. The following table illustrates this per share dilution:     
 
 
<TABLE>     
   <S>                                                             <C>   <C>
   Assumed initial public offering price per share................       $10.00
   Pro forma net tangible book value per share at June 30, 1996... $0.38
   Increase per share attributable to new investors...............  1.73
                                                                   -----
   Pro forma as adjusted net tangible book value per share after
    offering......................................................         2.11
                                                                         ------
   Dilution per share to new investors............................       $ 7.89
                                                                         ======
</TABLE>    
  The following table summarizes, on a pro forma as adjusted basis as of June
30, 1996, the number of shares of Common Stock purchased from the Company
(after giving effect to the conversion of all outstanding shares of
Convertible Preferred Stock into Common Stock), the total consideration paid,
and the average price per share paid by existing stockholders and to be paid
by the new investors, at an assumed initial public offering price of $10.00
per share (which represents the highest price in the range of initial public
offering prices set forth on the front cover of this Prospectus), before
deducting the estimated underwriting discounts and commissions and offering
expenses payable by the Company:
 
 
<TABLE>   
<CAPTION>
                             SHARES PURCHASED  TOTAL CONSIDERATION
                            ------------------ ------------------- AVERAGE PRICE
                              NUMBER   PERCENT   AMOUNT    PERCENT   PER SHARE
                            ---------- ------- ----------- ------- -------------
<S>                         <C>        <C>     <C>         <C>     <C>
Existing stockholders(1)... 11,904,592   79.8% $ 9,346,000   23.6%    $ 0.79
New investors(1)...........  3,021,868   20.2   30,218,680   76.4      10.00
                            ----------  -----  -----------  -----
  Total.................... 14,926,460  100.0% $39,564,680  100.0%
                            ==========  =====  ===========  =====
</TABLE>    
- --------
   
(1) Sales by the Selling Stockholders in this offering will reduce the number
    of shares held by existing stockholders to 11,126,460 or approximately
    74.5% (10,556,460 shares or approximately 70.7% if the Underwriters' over-
    allotment option is exercised in full) and will increase the number of
    shares held by new investors to 3,800,000 or approximately 25.5%
    (4,370,000 shares or approximately 29.3% if the Underwriters' over-
    allotment option is exercised in full) of the total number of shares of
    Common Stock outstanding after this offering. See "Principal and Selling
    Stockholders."     
   
  The foregoing table does not reflect exercises of options or warrants since
June 30, 1996 or the repurchases of Common Stock by the Company and assumes no
exercise of any currently outstanding options or warrants. As of June 30,
1996, there were outstanding options to purchase 1,615,800 shares of Common
Stock at a weighted average exercise price of $1.80 per share and outstanding
warrants to purchase 750,250 shares of Common Stock at an exercise price of
$2.00 (excluding certain warrants to be exercised as of the closing of this
offering). In addition, on August 26, 1996, the Company issued a warrant to
purchase 100,000 shares of Common Stock at the initial public offering price
set forth on the front cover page hereof to an existing stockholder. To the
extent that such options and warrants are exercised in the future, there will
be further dilution to new investors. See "Management--Benefit Plans,"
"Description of Capital Stock" and Notes 7 and 12 to Notes to Financial
Statements.     
 
                                      17
<PAGE>
 
                            SELECTED FINANCIAL DATA
 
  The following selected financial data for the five years ended September 30,
1995 and the three months ended December 31, 1995 have been derived from the
Company's audited historical financial statements, certain of which are
included in this Prospectus. Selected financial data for the twelve months
ended December 31, 1995 are unaudited. Selected financial data for the three
months ended December 31, 1994, and six months ended June 30, 1995 and June
30, 1996 have been derived from the unaudited financial statements of the
Company. In the opinion of management, the unaudited financial information
presented reflects all adjustments, consisting only of normal, recurring
adjustments, necessary for a fair presentation of the financial information
for each such period. Operating results for the six months ended June 30, 1996
are not necessarily indicative of the results that may be expected for any
other interim period or for the year ending December 31, 1996. This data
should be read in conjunction with the Financial Statements and Notes thereto
and the other financial information included elsewhere in this Prospectus. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations."
 
<TABLE>   
<CAPTION>
                                                                      TWELVE   THREE MONTHS      SIX MONTHS
                                                                      MONTHS       ENDED            ENDED
                                YEARS ENDED SEPTEMBER 30,             ENDED      DEC. 31,         JUNE 30,
                          -----------------------------------------  DEC. 31,  --------------  ----------------
                           1991     1992    1993    1994     1995    1995(1)    1994    1995    1995     1996
                          -------  ------  ------  -------  -------  --------  ------  ------  -------  -------
                                            (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                       <C>      <C>     <C>     <C>      <C>      <C>       <C>     <C>     <C>      <C>
STATEMENT OF OPERATIONS
 DATA:
Revenues................  $ 1,174  $2,988  $6,986  $13,398  $19,350  $20,347   $5,515  $6,512   $9,003  $13,263
Cost of revenues........      824   1,703   3,554    7,415   12,607   13,075    3,016   3,484    6,232    7,511
                          -------  ------  ------  -------  -------  -------   ------  ------  -------  -------
Gross profit............      350   1,285   3,432    5,983    6,743    7,272    2,499   3,028    2,771    5,752
                          -------  ------  ------  -------  -------  -------   ------  ------  -------  -------
Operating expenses:
 Development............      614     790   1,164    2,317    3,864    4,159      850   1,145    1,863    1,971
 Sales and marketing....      214     241     829      815    1,902    2,264      433     795      938    1,917
 General and administra-
  tive..................      647     877   1,309    1,644    2,584    2,655      630     701    1,301    1,172
                          -------  ------  ------  -------  -------  -------   ------  ------  -------  -------
Total operating ex-
 penses.................    1,475   1,908   3,302    4,776    8,350    9,078    1,913   2,641    4,102    5,060
                          -------  ------  ------  -------  -------  -------   ------  ------  -------  -------
Income (loss) from oper-
 ations.................   (1,125)   (623)    130    1,207   (1,607)  (1,806)     586     387   (1,331)     692
Other income (ex-
 pense)(2)..............      (77)   (130)   (255)    (234)    (826)    (965)    (174)   (313)    (405)    (370)
                          -------  ------  ------  -------  -------  -------   ------  ------  -------  -------
Income (loss) before in-
 come taxes.............   (1,202)   (753)   (125)     973   (2,433)  (2,771)     412      74   (1,736)     322
Provision for income
 taxes..................      --      --      --       (23)     --        (2)     --       (2)     --       (19)
                          -------  ------  ------  -------  -------  -------   ------  ------  -------  -------
Net income (loss).......  $(1,202) $ (753) $ (125) $   950  $(2,433) $(2,773)  $  412  $   72  $(1,736) $   303
                          =======  ======  ======  =======  =======  =======   ======  ======  =======  =======
Pro forma net income
 (loss) per common
 share(3)...............                                    $ (0.19)                   $ 0.01            $ 0.02
Pro forma weighted aver-
 age number of common
 and common equivalent
 shares outstanding(3)..                                     12,614                    13,115            13,747
</TABLE>    
 
<TABLE>
<CAPTION>
                                      SEPTEMBER 30,
                         -------------------------------------------  DEC. 31,  JUNE 30,
                          1991     1992     1993     1994     1995      1995      1996
                         -------  -------  -------  -------  -------  --------  --------
                                              (IN THOUSANDS)
<S>                      <C>      <C>      <C>      <C>      <C>      <C>       <C>
BALANCE SHEET DATA:
Cash and cash equiva-
 lents.................. $    44  $   182  $   192  $ 1,832  $   539  $    58   $ 3,532
Working capital (defi-
 ciency)................    (818)  (1,030)    (292)   1,715   (3,280)  (1,967)    2,420
Total assets............   1,095    2,390    3,396    9,181   10,214   11,041    14,555
Long-term obligations,
 less current portion...     172      624      554    4,197    3,796    4,515     2,694
Redeemable convertible
 preferred stock........   1,009    2,198    2,933    2,948    3,131    3,177     9,226
Stockholders' deficien-
 cy.....................  (1,420)  (2,292)  (2,132)  (1,093)  (3,564)  (3,535)   (4,153)
</TABLE>
- --------
(1) The Company changed its fiscal year end from September 30 to December 31,
    effective with the fiscal year ending December 31, 1996.
(2) Consists principally of interest expense.
(3) Gives effect to the conversion of all outstanding shares of Convertible
    Preferred Stock into 5,247,324 shares of Common Stock upon the closing of
    this offering. The Company has never declared or paid any cash dividends
    on its Common Stock.
 
                                      18
<PAGE>
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
  The following discussion and analysis should be read in conjunction with
"Selected Financial Data" and the Company's Financial Statements and Notes
thereto included elsewhere in this Prospectus. The discussion in this
Prospectus contains forward-looking statements that involve risks and
uncertainties, such as statements of the Company's plans, objectives,
expectations and intentions. The cautionary statements made in this Prospectus
should be read as being applicable to all related forward-looking statements
wherever they appear in this Prospectus. This Company's actual results could
differ materially from those discussed herein. Factors that could cause or
contribute to such differences include those discussed in "Risk Factors" as
well as those discussed elsewhere herein.
 
OVERVIEW
 
  Lightbridge develops, markets and supports a suite of integrated products
and services that enable wireless telecommunications carriers to improve their
customer acquisition and retention processes. The Company changed its fiscal
year end from September 30 to December 31, effective with the fiscal year
ending December 31, 1996. The financial statements for the period ended
December 31, 1995 reflect the Company's results of operations for the three
months then ended. References to fiscal years are to years ended September 30.
 
  Lightbridge's total revenues increased from $7.0 million in fiscal 1993 to
$19.4 million in fiscal 1995. This revenue increase has been driven primarily
by increases in volume of wireless customer qualification and activation
transactions processed for wireless carrier clients and in the utilization of
the Company's products and services by carriers. The Company's revenues
consist of transaction revenues and software and other revenues. Historically,
transaction revenues have accounted for substantially all of the Company's
revenues, although software and other revenues have increased during recent
periods primarily as a result of the initial licensing of certain software
products. Software and other revenues, which represented no more than 6.0% of
total revenues in each of fiscal 1993, 1994 and 1995, increased to 7.0% and
19.7% of total revenues in the three months ended December 31, 1995 and the
six months ended June 30, 1996, respectively. There can be no assurance that
the Company's software products will achieve market acceptance or that the mix
of the Company's revenues will remain constant.
 
  Lightbridge's transaction revenues are derived primarily from the processing
of applications of subscribers for wireless telecommunications services and
the activation of service for those subscribers. Over time the Company has
expanded its offerings from credit evaluation services to include screening
for subscriber fraud, evaluating carriers' existing accounts, interfacing with
carrier and third-party systems, and providing teleservices call center
services. These services are provided pursuant to contracts with carriers
which specify the services to be utilized and the markets to be served.
Generally, the Company's clients are charged on a per transaction or, to a
lesser extent, on a per minute basis. Pricing varies depending primarily on
the volume of transactions, the type and number of other products and services
selected for integration with the services, and the term of the contract under
which services are provided. The volume of processed transactions varies
depending on seasonal and retail trends, the success of the carriers utilizing
the Company's services in attracting subscribers and the markets served by the
Company for its clients. Revenues are recognized in the period when the
services are performed.
 
  The Company's software and other revenues have been derived primarily from
developing customized software and providing Business Integration consulting
services. The Company also began licensing its Channel Solutions software with
the introduction of its POPS and Iris products in fiscal 1995 and its SAMS
software in 1996. Lightbridge's Channel Solutions products and services are
designed to assist clients in interfacing with the Company's systems and are
being marketed primarily to wireless telecommunications carriers that utilize
the Company's transaction processing services. The Company's Wireless
Intelligence products are being designed to help carriers analyze their
marketplace to improve their business operations. While its Channel Solutions
products are, and its Wireless Intelligence products are currently expected to
be, licensed as packaged software
 
                                      19
<PAGE>
 
products, each of these products requires customization and integration with
other products and systems to varying degrees. Revenues derived from
consulting and other projects are recognized throughout the performance period
of the contracts. Revenues from licensing software are recognized at the later
of delivery of the licensed product or satisfaction of acceptance criteria.
Lightbridge's software and other revenues depend primarily on the continuing
need for integration of diverse systems and acceptance of the Company's
software products by the Company's existing and new clients.
 
  During fiscal 1994 and 1995 and the three months ended December 31, 1995,
each of the Company's four largest clients, and for the six months ended June
30, 1996, each of the Company's three largest clients, accounted for more than
10% of the Company's total revenues, representing an aggregate of 64%, 63%,
61% and 50% of total revenues in those periods, respectively. During fiscal
1993, the Company's two largest clients each accounted for more than 10% of
the Company's total revenues, representing an aggregate of 34% of total
revenues. One of the Company's clients, which accounted for 10% and 11% of the
Company's revenues in the year ended September 30, 1995 and the six months
ended June 30, 1996, respectively, has notified the Company of its intent to
terminate its agreements with the Company, effective in the fourth calendar
quarter of 1996. During 1996, another of these clients, which accounted for
31% and 19% of the Company's revenues in the fiscal year ended September 30,
1995 and the six months ended June 30, 1996, respectively, is changing the way
it accesses the Company's Customer Acquisition System. Both of these clients
historically used the call center support solutions provided by the Company's
Teleservices Group. The continuing customer is switching to on-line access to
the Customer Acquisition System. As a result, the Company expects the revenues
from this client to decrease significantly during 1996 and 1997. The Company
currently believes that the loss of revenues from these clients will be
mitigated by increased revenues from existing clients and revenues from new
clients. Further, the cost of processing transactions through the Teleservices
Group typically involves personnel costs associated with staffing the
Company's call center, which are not required for on-line transaction
processing. Thus, the Company currently expects that its variable cost of
revenues associated with processing transactions will decrease as a result of
the termination of the agreements with one client and the change in services
used by the other client. As a result, the Company currently believes that the
termination of these agreements by one client, and the change in services used
by the other client, will not have a material adverse effect on its business,
financial condition, results of operations or cash flow. See "Risk Factors--
Dependence on Limited Number of Clients." The Company's revenues have been
derived exclusively from sales of products and services in the United States.
 
  Beginning in fiscal 1995, Lightbridge has increased its sales and marketing
efforts to renew contracts with existing cellular carrier clients and to add
new wireless telecommunications carrier clients, including PCS service
providers. In addition, beginning in fiscal 1995, the Company has increased
its development efforts to continue to enhance its existing software and to
develop and acquire new software products and services, including its Channel
Solutions and Wireless Intelligence software products and services. The
Company currently intends to continue to increase its development, sales and
marketing efforts in pursuit of these goals.
 
  Prior to fiscal 1995, the Company's development activities were focused on
creating software for its outsourcing and service bureau operations. All
development costs related to these activities were expensed when incurred. In
fiscal 1995, Lightbridge began developing certain software products to be
licensed as separate products. In connection with these development efforts,
the Company acquired rights to certain pen-based technology for $400,000,
which has been incorporated in the Company's SAMS product, and certain
multimedia software technology, which has been incorporated in the Company's
Iris product. The multimedia technology was purchased for $45,000 in cash plus
an obligation to pay certain royalties. Royalties totalling $6,000 were paid
as of June 30, 1996. In fiscal 1995, the Company capitalized approximately
$980,000 of software development costs for internally developed products and
for the purchase of such technology. Commencing with the availability of the
SAMS and Iris products for general release in fiscal 1995, capitalized
software development costs are being amortized using the straight-line method
over a two-year period.
 
                                      20
<PAGE>
 
RESULTS OF OPERATIONS
 
  The following table sets forth, for the periods indicated, certain financial
data as a percentage of total revenues:
 
<TABLE>
<CAPTION>
                                                          THREE MONTHS ENDED    SIX MONTHS ENDED
                                                          --------------------  -------------------
                           YEAR ENDED SEPTEMBER 30,          DECEMBER 31,           JUNE 30,
                          -----------------------------   --------------------  -------------------
                            1993       1994      1995       1994       1995       1995       1996
                          --------   --------  --------   ---------  ---------  --------   --------
<S>                       <C>        <C>       <C>        <C>        <C>        <C>        <C>
Revenues:
  Transaction...........      94.0%      96.3%     95.1%       96.6%      93.0%       96%      80.3%
  Software and other....       6.0        3.7       4.9         3.4        7.0       4.0       19.7
                          --------   --------  --------   ---------  ---------  --------   --------
                             100.0      100.0     100.0       100.0      100.0     100.0      100.0
Cost of revenues........      50.9       55.3      65.2        54.7       53.5      69.2       56.6
                          --------   --------  --------   ---------  ---------  --------   --------
Gross profit............      49.1       44.7      34.8        45.3       46.5      30.8       43.4
                          --------   --------  --------   ---------  ---------  --------   --------
Operating expenses:
  Development...........      16.7       17.3      20.0        15.4       17.6      20.7       14.9
  Sales and marketing...      11.9        6.1       9.8         7.9       12.2      10.4       14.5
  General and adminis-
   trative..............      18.7       12.3      13.3        11.4       10.8      14.5        8.8
                          --------   --------  --------   ---------  ---------  --------   --------
    Total operating ex-
     penses.............      47.3       35.7      43.1        34.7       40.6      45.6       38.2
                          --------   --------  --------   ---------  ---------  --------   --------
Income (loss) from oper-
 ations.................       1.8        9.0      (8.3)       10.6        5.9     (14.8)       5.2
Other income (expense),
 net....................      (3.6)      (1.7)     (4.3)       (3.1)      (4.8)     (4.5)      (2.8)
                          --------   --------  --------   ---------  ---------  --------   --------
Income (loss) before in-
 come taxes.............      (1.8)       7.3     (12.6)        7.5        1.1     (19.3)       2.4
Provision for income
 taxes..................       --        (0.2)      --          --         --        --        (0.1)
                          --------   --------  --------   ---------  ---------  --------   --------
Net income (loss).......      (1.8)%      7.1%    (12.6)%       7.5%       1.1%    (19.3)%      2.3%
                          ========   ========  ========   =========  =========  ========   ========
</TABLE>
 
 Six Months Ended June 30, 1996 Compared with Six Months Ended June 30, 1995
 
  Revenues. Total revenues increased by 47% to $13.3 million in the six months
ended June 30, 1996 from $9.0 million in the six months ended June 30, 1995.
Transaction revenues increased by 23% to $10.7 million in the six months ended
June 30, 1996 from $8.6 million in the six months ended June 30, 1995,
primarily due to increased volume of wireless customer qualification and
activation transactions processed for existing carrier clients and, to a
lesser extent, new carrier clients. Software and other revenues increased by
621% to $2.6 million in the six months ended June 30, 1996 from $0.4 million
in the six months ended June 30, 1995 principally as a result of the increase
in revenues attributable to customized software integration services provided
to both existing and new clients and inclusion in the 1996 period of revenues
from the Company's Channel Solutions products and services. The increase in
revenues from customized software integration services in the 1996 period
resulted primarily from projects undertaken for one client, which projects the
Company currently expects will continue at least through the end of 1996.
 
  Cost of Revenues. Cost of revenues consists primarily of personnel costs,
costs of maintaining systems and networks used in processing subscriber
qualification and activation transactions (including depreciation and
amortization of those systems and networks) and amortization of capitalized
software. Cost of revenues may vary as a percentage of total revenues in the
future as a result of a number of factors, including changes in the mix of
transaction revenues between revenues from on-line transaction processing and
revenues from processing transactions through the Company's TeleServices Group
and changes in the mix of total revenues between transaction revenues and
software and other revenues. Cost of revenues increased by 21% to $7.5 million
in the six months ended June 30, 1996 from $6.2 million in the six months
ended June 30, 1995, while decreasing as a percentage of total revenues to 57%
from 69%. The dollar increase in costs resulted principally from increases in
transaction volume, costs attributable to expansion of the Company's staff and
systems capacity and amortization of capitalized software. The decrease in
cost of revenues as a percentage of total revenues primarily
reflected a higher percentage of transaction revenues from on-line processing
than teleservices operations, a
 
                                      21
<PAGE>
 
higher percentage of revenues from customized software integration services
and software licenses and increased utilization of the Company's operating and
networking systems.
 
  Development. Development expenses consist primarily of personnel and outside
technical services costs related to developing new products and services,
enhancing existing products and services, and implementing and maintaining new
and existing products and services. Development expenses also include software
development costs incurred prior to the establishment of technological
feasibility. Development expenses increased by 5.8% to $2.0 million in the six
months ended June 30, 1996 from $1.9 million in the six months ended June 30,
1995, while decreasing as a percentage of total revenues to 15% from 21%. The
increase in costs resulted principally from the hiring of additional personnel
to support the continued enhancement of products and services and the
development of new products and services including customized software
integration services, as well as the initial two modules in the Wireless
Intelligence suite. The decrease in development expenses as a percentage of
total revenues reflected the significant growth in the Company's total
revenues. The Company did not capitalize any software development costs during
the six months ended June 30, 1996 and capitalized $524,000 of internally
developed software development costs during the six months ended June 30,
1995.
 
  The Company expects to increase its engineering and development efforts in
order to continue enhancing its existing products and services, including its
CAS, Wireless Intelligence, Business Integration and Channel Solutions
products, as well as to develop new products and services.
 
  Sales and Marketing. Sales and marketing expenses consist primarily of
salaries, commissions and travel expenses of direct sales and marketing
personnel, as well as costs associated with advertising, trade shows and
conferences. Sales and marketing expenses increased by 104% to $1.9 million in
the six months ended June 30, 1996 from $0.9 million in the six months ended
June 30, 1995, and increased as a percentage of total revenues to 14% from
10%. The increase in costs was due to the addition of direct sales personnel,
increased commissions resulting from the higher level of revenues and
increased use of marketing programs, including trade shows. The Company
continues to invest in sales and marketing efforts in order to increase its
penetration of existing accounts and to add new clients and markets.
 
  General and Administrative. General and administrative expenses consist
principally of salaries of administrative, executive, finance and human
resources personnel, as well as outside professional fees. General and
administrative expenses decreased by 10% to $1.2 million in the six months
ended June 30, 1996 from $1.3 million in the six months ended June 30, 1995,
and decreased as a percentage of total revenues to 9% from 14%. The decrease
in general and administrative expenses was due principally to a decrease in
legal costs associated with litigation (see "Certain Transactions--Settlement
Agreement and Related Matters") as well as reduced general and administrative
headcount.
 
  Other Income (Expense) Net. Other income (expense) decreased by 9% to
$370,000 in the six months ended June 30, 1996 from $405,000 in the six months
ended June 30, 1995. Other income (expense) has consisted predominantly of
interest expense. Interest expense consists of interest, commitment fees and
other similar fees payable with respect to the Company's bank lines of credit,
subordinated notes and capital leases. Interest expense decreased by 1% to
$416,000 in the six months ended June 30, 1996 from $421,000 in the six months
ended June 30, 1995. Interest income, which historically had not been
significant, increased to $44,000 in the six months ended June 30, 1996 from
$15,000 in the six months ended June 30, 1995 as a result of the investment of
the proceeds from the issuance of Series D Convertible Preferred Stock in
April 1996.
 
  Provision for Income Taxes. Due to the application of net operating loss
carryforwards from previous years, no significant provision for or benefit
from income taxes was recorded in the six months ended June 30, 1996. The
Company incurred a net loss for the three months ended June 30, 1995 and did
not record a benefit for income tax for the period.
 
                                      22
<PAGE>
 
 Three Months Ended December 31, 1995 Compared with Three Months Ended
December 31, 1994
 
  Revenues. Total revenues increased by 18% to $6.5 million in the three
months ended December 31, 1995 from $5.5 million in the three months ended
December 31, 1994. Transaction revenues increased by 14% to $6.1 million in
the three months ended December 31, 1995 from $5.3 million in the three months
ended December 31, 1994, principally from increased volume of wireless
customer qualification and activation transactions processed for existing
carrier clients and, to a lesser extent, new carrier clients. Software and
other revenues increased by 142% to $458,000 in the three months ended
December 31, 1995 from $189,000 in the three months ended December 31, 1994,
primarily as a result of the inclusion in the three months ended December 31,
1995 of revenues attributable to the Company's Channel Solutions products and
services.
 
  Cost of Revenues. Cost of revenues increased by 16% to $3.5 million in the
three months ended December 31, 1995 from $3.0 million in the three months
ended December 31, 1994, while decreasing as a percentage of total revenues to
54% from 55%. The dollar increase in costs resulted primarily from increases
in transaction volume, increases in personnel costs attributable to the
Company's TeleServices Group and the inclusion of amortization of capitalized
software. The decrease in cost of revenues as a percentage of total revenues
was primarily the result of a higher percentage of software license revenues,
offset in part by increased costs associated with the Company's infrastructure
investments.
 
  Development. Development expenses increased by 35% to $1.1 million in the
three months ended December 31, 1995 from $0.9 million in the three months
ended December 31, 1994, while increasing as a percentage of total revenues to
18% from 15%. The increase in costs resulted primarily from the hiring of
additional personnel to support the continued enhancement of the Company's
existing products and services and the development of new products and
services, including Channel Solutions, Wireless Intelligence and Business
Integration products and services. The Company did not capitalize any software
development costs during the three months ended December 31, 1995 and
capitalized $62,000 of internally developed software development costs during
the three months ended December 31, 1994.
 
  Sales and Marketing. Sales and marketing expenses increased by 84% to
$795,000 in the three months ended December 31, 1995 from $433,000 in the
three months ended December 31, 1994, and increased as a percentage of total
revenues to 12% from 8%. The increase in costs was due primarily to the
addition of direct sales personnel and increased commissions resulting from
the higher level of revenues.
 
  General and Administrative. General and administrative expenses increased by
11% to $701,000 in the three months ended December 31, 1995 from $630,000 in
the three months ended December 31, 1994. The increase in costs reflects
increases in administrative and finance personnel and, to a lesser extent,
legal costs associated with litigation against a former officer of the
Company.
 
  Other Income (Expense), Net. Interest expense increased by 66% to $307,000
in the three months ended December 31, 1995 from $185,000 in the three months
ended December 31, 1994. This increase principally reflected a higher level of
borrowings for working capital purposes under the Company's bank line of
credit, as well as the inclusion of interest attributable to the issuance of
subordinated notes in August 1995. In addition, interest on capital leases
increased as the result of significant investments in the Company's
infrastructure, which were financed primarily through the leasing of equipment
accounted for as capital leases.
 
  Provision for Income Taxes. Due to the application of net operating loss
carryforwards from previous years, no significant provision for or benefit
from income taxes was recorded in the three months ended December 31, 1995 and
1994. At December 31, 1995, the Company had net operating loss carryforwards
for federal income tax purposes of $2.1 million, expiring at various dates
through 2010.
 
 Fiscal Year Ended September 30, 1995 Compared with Fiscal Year Ended
September 30, 1994
 
  Revenues. Total revenues increased by 44% to $19.4 million in fiscal 1995
from $13.4 million in fiscal j1994. Transaction revenues increased by 43% to
$18.4 million in fiscal 1995 from $12.9 million in fiscal 1994, principally
from increased volume of wireless customer qualification and activation
transactions processed for
 
                                      23
<PAGE>
 
existing carrier clients. Software and other revenues increased by 92% to
$948,000 in fiscal 1995 from $495,000 in fiscal 1994, primarily due to an
increase in customized software development for existing clients.
 
  Cost of Revenues. Cost of revenues increased by 70% to $12.6 million in
fiscal 1995 from $7.4 million in fiscal 1994, and increased as a percentage of
total revenues to 65% from 55%. The increase in costs resulted primarily from
increases in transaction volume and increases in personnel costs attributable
to the Company's TeleServices Group and other business operations. In fiscal
1995, the Company relocated its TeleServices Group to a larger facility,
resulting in increased facilities costs. The Company made significant
investments in fiscal 1995 in its computing platform, as well as in increased
networking and systems capacity. The increase in cost of revenues as a
percentage of total revenues reflected continued investment in the Company's
service delivery infrastructure.
 
  Development. Development expenses increased by 67% to $3.9 million in fiscal
1995 from $2.3 million in fiscal 1994, and increased as a percentage of total
revenues to 20% from 17%. The increase in costs was principally attributable
to the hiring of additional personnel to support the continued enhancement of
the Company's existing products and services and the development of new
products and services, including Channel Solutions and Wireless Intelligence
products and services. This increase was offset in part by the capitalization
of $980,000 of software development costs for internally developed products
and for certain purchased technology. The Company did not capitalize any
software development costs in fiscal 1994.
 
  Sales and Marketing. Sales and marketing expenses increased by 133% to $1.9
million in fiscal 1995 from $0.8 million in fiscal 1994, and increased as a
percentage of total revenues to 10% from 6%. The increase in costs was due
principally to increased commissions resulting from the higher level of
transaction revenues, an increase in sales and marketing personnel and an
increase in recruiting, training and other expenses related to the expansion
of the Company's sales and marketing organization. The increase was also
attributable to the Company's increased participation in trade shows and
conferences and additional advertising in trade publications.
 
  General and Administrative. General and administrative expenses increased by
57% to $2.6 million in fiscal 1995 from $1.6 million in fiscal 1994, and
increased as a percentage of total revenues to 13% from 12%. The increase in
costs was principally due to hiring of additional personnel to support the
Company's growth and, to a lesser extent, legal costs associated with
litigation against a former officer of the Company.
 
  Other Income (Expense), Net. Interest expense increased by 252% to $864,000
in fiscal 1995 from $246,000 in fiscal 1994. This increase principally
consisted of interest attributable to the issuance of subordinated notes in
August 1995, as well as a higher level of borrowings for working capital
purposes under the Company's bank line of credit. In addition, interest on
capital leases increased as the result of significant investments in the
Company's infrastructure, which were financed primarily through the leasing of
equipment accounted for as capital leases.
 
  Provision for Income Taxes. The Company recorded a net loss in fiscal 1995
and did not record a provision for or benefit from income taxes. As a result
of the Company's net operating loss carryforwards from previous years, the
provision for income taxes in fiscal 1994 consisted of alternative minimum
taxes.
 
 Fiscal Year Ended September 30, 1994 Compared with Fiscal Year Ended
September 30, 1993
 
  Revenues. Total revenues increased by 92% to $13.4 million in fiscal 1994
from $7.0 million in fiscal 1993. Transaction revenues increased by 97% to
$12.9 million in fiscal 1994 from $6.6 million in fiscal 1993, principally
from increased volume of wireless customer qualification and activation
transactions processed for existing carrier clients (including expansion into
new geographic markets) and new carrier clients. Software and other revenues
increased by 18% to $495,000 in fiscal 1994 from $420,000 in fiscal 1993, due
principally to a change in the Company's pricing practices for custom
development services.
 
  Cost of Revenues. Cost of revenues increased by 109% to $7.4 million in
fiscal 1994 from $3.6 million in fiscal 1993, and increased as a percentage of
total revenues to 55% from 51%. The increase in costs resulted from the
Company's increased transaction volume and continued investments in its
service delivery infrastructure.
 
                                      24
<PAGE>
 
  Development. Development expenses increased by 99% to $2.3 million in fiscal
1994 from $1.2 million in fiscal 1993, while remaining relatively unchanged as
a percentage of total revenues at approximately 17%. The increase in costs
resulted from an increase in the number of engineering personnel in order to
expand the modules offered as a part of CAS and to further the development of
ProFile and system interfaces. The Company did not capitalize any software
development costs during fiscal 1994 or 1993.
 
  Sales and Marketing. Sales and marketing expenses decreased by 2% to
$815,000 in fiscal 1994 from $829,000 in fiscal 1993, and decreased as a
percentage of total revenues to 6% from 12%. The lower level of sales and
marketing expenses as a percentage of revenues in fiscal 1994 reflected the
significant revenue increase in fiscal 1994, as the Company benefited from the
addition of sales and marketing personnel during fiscal 1993.
 
  General and Administrative. General and administrative expenses increased by
26% to $1.6 million in fiscal 1994 from $1.3 million in fiscal 1993, while
decreasing as a percentage of total revenues to 12% from 19%. The increase in
costs was principally due to hiring of additional personnel to support the
Company's growth.
 
  Other Income (Expense), Net. Interest expense decreased by 2% to $246,000 in
fiscal 1994 from $250,000 in fiscal 1993. This decrease principally reflected
lower interest rates in fiscal 1994.
 
  Provision for Income Taxes. As a result of the Company's net operating loss
carryforwards from previous years, the provision for income taxes in fiscal
1994 consisted of alternative minimum taxes. No provision for or benefit from
income taxes was recorded in fiscal 1993.
 
QUARTERLY RESULTS OF OPERATIONS
 
  The following tables set forth certain quarterly financial data for the
eight quarters ended June 30, 1996. The quarterly information is unaudited but
has been prepared on the same basis as the audited financial statements
included elsewhere in this Prospectus. In the opinion of management, all
necessary adjustments (consisting only of normal recurring adjustments) have
been included to present fairly the unaudited quarterly results when read in
conjunction with the Financial Statements and Notes thereto included elsewhere
in this Prospectus. The results of operations for any quarter are not
necessarily indicative of the results of any future period.
 
<TABLE>
<CAPTION>
                                                      THREE MONTHS ENDED
                          --------------------------------------------------------------------------
                          SEPT. 30 DEC. 31, MARCH 31, JUNE 30, SEPT. 30, DEC. 31, MARCH 31, JUNE 30,
                            1994     1994     1995      1995     1995      1995     1996      1996
                          -------- -------- --------- -------- --------- -------- --------- --------
                                                        (IN THOUSANDS)
<S>                       <C>      <C>      <C>       <C>      <C>       <C>      <C>       <C>
RESULTS OF OPERATIONS
Revenues:
  Transaction...........   $3,815   $5,326   $4,215    $4,426   $ 4,435   $6,054   $5,284    $5,369
  Software and other....      164      189      237       125       397      458    1,030     1,580
                           ------   ------   ------    ------   -------   ------   ------    ------
                            3,979    5,515    4,452     4,551     4,832    6,512    6,314     6,949
Cost of revenues........    2,589    3,016    3,125     3,107     3,360    3,484    3,634     3,877
                           ------   ------   ------    ------   -------   ------   ------    ------
Gross profit............    1,390    2,499    1,327     1,444     1,472    3,028    2,680     3,072
                           ------   ------   ------    ------   -------   ------   ------    ------
Operating expenses:
  Development...........      756      850      929       934     1,151    1,145      953     1,018
  Sales and marketing...      212      433      477       462       530      795      896     1,021
  General and adminis-
   trative..............      340      630      566       735       653      701      549       623
                           ------   ------   ------    ------   -------   ------   ------    ------
    Total operating ex-
     penses.............    1,308    1,913    1,972     2,131     2,334    2,641    2,398     2,662
                           ------   ------   ------    ------   -------   ------   ------    ------
Income (loss) from oper-
 ations.................       82      586     (645)     (687)     (862)     387      282       410
Other income (expense),
 net....................      (99)    (174)    (202)     (203)     (247)    (313)    (250)     (120)
                           ------   ------   ------    ------   -------   ------   ------    ------
Income (loss) before in-
 come taxes.............      (17)     412     (847)     (890)   (1,109)      74       32       290
Provision for income
 taxes..................      --       --       --        --        --        (2)      (9)      (10)
                           ------   ------   ------    ------   -------   ------   ------    ------
Net income (loss).......   $  (17)  $  412   $ (847)   $ (890)  $(1,109)  $   72   $   23    $  280
                           ======   ======   ======    ======   =======   ======   ======    ======
</TABLE>
 
                                      25
<PAGE>
 
<TABLE>
<CAPTION>
                                                      THREE MONTHS ENDED
                          ----------------------------------------------------------------------------
                          SEPT. 30, DEC. 31, MARCH 31, JUNE 30,  SEPT. 30, DEC. 31, MARCH 31, JUNE 30,
                            1994      1994     1995      1995      1995      1995     1996      1996
                          --------- -------- --------- --------  --------- -------- --------- --------
<S>                       <C>       <C>      <C>       <C>       <C>       <C>      <C>       <C>
AS A PERCENTAGE OF TOTAL
 REVENUES
Revenues:
  Transaction...........     95.9%    96.6%     94.7%    97.3%      91.8%    93.0%     83.7%    77.3%
  Software and other....      4.1      3.4       5.3      2.7        8.2      7.0      16.3     22.7
                            -----    -----     -----    -----      -----    -----     -----    -----
                            100.0    100.0     100.0    100.0      100.0    100.0     100.0    100.0
Cost of revenues........     65.1     54.7      70.2     68.2       69.5     53.5      57.5     55.8
                            -----    -----     -----    -----      -----    -----     -----    -----
Gross profit............     34.9     45.3      29.8     31.8       30.5     46.5      42.5     44.2
                            -----    -----     -----    -----      -----    -----     -----    -----
Operating expenses:
  Development...........     19.0     15.4      20.9     20.5       23.8     17.6      15.1     14.6
  Sales and marketing...      5.3      7.9      10.7     10.2       11.0     12.2      14.2     14.7
  General and adminis-
   trative..............      8.5     11.4      12.7     16.2       13.5     10.8       8.7      9.0
                            -----    -----     -----    -----      -----    -----     -----    -----
    Total operating ex-
     penses.............     32.8     34.7      44.3     46.9       48.3     40.6      38.0     38.3
                            -----    -----     -----    -----      -----    -----     -----    -----
Income (loss) from oper-
 ations.................      2.1     10.6     (14.5)   (15.1)     (17.8)     5.9       4.5      5.9
Other income (expense),
 net....................     (2.5)    (3.1)     (4.5)    (4.4)      (5.1)    (4.8)     (4.0)    (1.8)
                            -----    -----     -----    -----      -----    -----     -----    -----
Income (loss) before in-
 come taxes.............     (0.4)     7.5     (19.0)   (19.5)     (22.9)     1.1       0.5      4.1
Provision for income
 taxes..................      --       --        --       --         --       --       (0.1)    (0.1)
                            -----    -----     -----    -----      -----    -----     -----    -----
Net income (loss).......     (0.4)%    7.5%    (19.0)%  (19.5)%    (22.9)%    1.1%      0.4%     4.0%
                            =====    =====     =====    =====      =====    =====     =====    =====
</TABLE>
 
  The Company has experienced fluctuations in its quarterly operating results
and anticipates that such fluctuations will continue and could intensify. The
Company's quarterly operating results may vary significantly depending on a
number of factors, including the timing of the introduction or acceptance of
new products and services offered by the Company or its competitors, changes
in the mix of products and services provided by the Company, the nature and
timing of changes in the Company's clients or their use of the Company's
products and services, consolidation among participants and other changes in
the wireless telecommunications industry, changes in the client markets served
by the Company, changes in regulations affecting the wireless industry,
changes in the Company's operating expenses, changes in personnel and changes
in general economic conditions. One of the Company's clients, which uses the
call center support solutions provided by the Company's Teleservices Group and
accounted for 10% of the Company's revenues in the year ended September 30,
1995, has notified the Company of its intent to terminate its agreements with
the Company, effective in the fourth calendar quarter of 1996. During 1996,
another of these clients, which accounted for 31% of the Company's revenues in
the fiscal year ended September 30, 1995, is changing the way it accesses the
Customer Acquisition System from using the call center support solutions
provided by the Teleservices Group to on-line access. As a result, the Company
expects the revenues from this client to decrease significantly during 1996
and 1997. See "--Overview." Historically, the Company's quarterly revenues
have been highest in the fourth quarter of each calendar year, and have been
particularly concentrated in the holiday shopping season between Thanksgiving
and Christmas. The Company's transaction revenues, which historically have
represented substantially all of the Company's total revenues, are affected by
the volume of use of the Company's services, which is influenced by seasonal
and retail trends, the success of the carriers utilizing the Company's
services in attracting subscribers and the markets served by the Company for
its clients. Software and other revenues, which include software license
revenues and consulting revenues, have recently represented an increasing
proportion of the Company's total revenues. Software license revenues are
principally recognized at the time of delivery of licensed products and
therefore may result in further fluctuations in the Company's quarterly
operating results. Consulting revenues may be influenced by the requirements
of one or more of the Company's significant clients, including engagement of
the Company for implementing or assisting in implementing special projects of
limited duration. During the three months ended June 30, 1996, the Company's
revenues from customized software integration services resulted primarily from
projects undertaken for one client, which projects the Company currently
expects will continue at least through the end of 1996. There can be no
assurance that the Company will be able to achieve or maintain profitability
in the future or that its levels of profitability will not vary significantly
among quarterly periods. Fluctuations in operating results may result in
volatility in the price of the Company's Common Stock. See "Risk Factors--
Potential Fluctuations in Quarterly Performance."
 
                                      26
<PAGE>
 
LIQUIDITY AND CAPITAL RESOURCES
 
  The Company has funded its operations to date primarily through private
placements of equity and debt securities, cash generated from operations, bank
borrowings and equipment financings.
 
  The Company has financed its operations in part with the proceeds of four
offerings of Convertible Preferred Stock and two offerings of subordinated
debt. The Company sold shares of its Series A Redeemable Convertible Preferred
Stock in February 1991 for an aggregate purchase price of $1.0 million, shares
of its Series B Redeemable Convertible Preferred Stock in December 1991 for an
aggregate purchase price of $1.1 million and shares of its Series C Redeemable
Convertible Preferred Stock in June, July and August of 1993 for an aggregate
purchase price of $0.6 million. In August 1994, the Company sold $2.1 million
in principal amount of its 8% subordinated notes, together with warrants
exercisable to purchase up to 525,000 shares of Common Stock. In August 1995,
the Company sold $1.2 million in principal amount of its 16% subordinated
notes, together with warrants exercisable to purchase up to 287,750 shares of
Common Stock. The Company sold shares of its Series D Preferred Stock in April
1996 for an aggregate purchase price of $6.0 million. A portion of the
proceeds of the Series D Preferred Stock was applied to repay the 16%
subordinated notes.
 
  Net cash provided by (used in) operating activities in the years ended
September 30, 1993, 1994 and 1995, the three months ended December 31, 1995
and the six months ended June 30, 1996 was $0.4 million, $0.5 million, $1.1
million, $(0.3) million and $0.8 million, respectively.
 
  The Company's capital expenditures in the years ended September 30, 1993,
1994 and 1995, the three months ended December 31, 1995 and the six months
ended June 30, 1996 aggregated $1.0 million, $3.6 million, $3.7 million, $0.3
million and $1.0 million, respectively. The capital expenditures consisted of
purchases of fixed assets, principally for the Company's services delivery
infrastructure and teleservices call center. The Company leases its facilities
and certain equipment under non-cancelable capital and operating lease
agreements that expire at various dates through December 2000. The Company
anticipates that its capital expenditures in the fiscal year ending December
31, 1996 will be made primarily to acquire, through purchases or capital lease
arrangements, additional computer equipment for development activities. The
Company currently expects that its capital expenditures, including equipment
acquired with capital leases, for the last six months of 1996 will be
approximately $2.0 million.
 
  The Company has a $4.0 million working capital line of credit and a $2.0
million equipment line of credit with Silicon Valley Bank (the "Bank"). The
working capital line of credit is secured by a pledge of the Company's
accounts receivable, equipment and intangible assets, and borrowing
availability is based on the amount of qualifying accounts receivable.
Advances under the working capital line of credit bear interest at the Bank's
prime rate plus .25% (8.50% at June 30, 1996) and advances under the equipment
line of credit bear interest at the Bank's prime rate plus .75% (9.0% at June
30, 1996). At June 30, 1996, borrowings of $1.5 million were outstanding under
the working capital line of credit and no borrowings were outstanding under
the equipment line of credit. The Company has agreed to comply with covenants
that, among other things, prohibit the declaration or payment of dividends and
require the Company to maintain certain financial ratios. After giving effect
to an amendment to the bank agreement dated August 8, 1996, the Company was in
compliance with the required financial covenants and ratios as of June 30,
1996. Further, the Company believes that the August 8, 1996 amendment will
permit the Company to remain in compliance with the required financial
covenants and ratios throughout the term of the bank agreement. The working
capital line of credit expires in June 1997, and the equipment line of credit
expires in June 1999.
 
  As of June 30, 1996, an aggregate of $2.1 million in principal amount was
outstanding under unsecured subordinated notes issued by the Company to a
greater-than-5% stockholder and a director, acting as custodian for a minor
child. See "Certain Transactions--Other." The principal of these notes is due
in quarterly installments from September 30, 1997 through June 30, 2001.
Prepayment of the notes is subject to a premium, currently 6% of the principal
amount prepaid. The notes accrue interest at an annual rate of 8% which is
payable quarterly. The Company's agreement with the holders of the notes
includes certain covenants that, among other things, prohibit the declaration
or payment of dividends and require the Company to maintain certain financial
ratios.
 
                                      27
<PAGE>
 
  As of June 30, 1996, the Company had cash and cash equivalents of $3.5
million and working capital of $2.4 million. The Company believes that the net
proceeds of this offering, together with existing cash balances and funds
available under existing lines of credit, will be sufficient to finance the
Company's operations and capital expenditures for at least the next twelve
months.
 
  In the normal course of business, the Company evaluates acquisitions or
investments in companies, technologies or assets that complement the Company's
business. The Company is not currently involved in negotiations with respect
to, and has no agreement or understanding regarding, any such acquisition or
investment.
 
INFLATION
 
  Although certain of the Company's expenses increase with general inflation
in the economy, inflation has not had a material impact on the Company's
financial results to date.
 
RECENT ACCOUNTING PRONOUNCEMENTS
 
  In March 1995, the Financial Accounting Standards Board issued SFAS No. 121,
"Accounting for the Impairment of Long-Lived Assets and for Long-Lived Assets
to be Disposed Of." SFAS No. 121 addresses the accounting for the impairment
of long-lived assets, certain identifiable intangibles and goodwill when
events or changes in circumstances indicate that the carrying amount of an
asset may not be recoverable. The adoption of SFAS No. 121 in 1996 did not
have a material impact on the Company's results of operations, financial
position or cash flows.
 
  In November 1995, the Financial Accounting Standards Board issued SFAS No.
123, "Accounting for Stock-Based Compensation." SFAS No. 123 addresses the
financial accounting and reporting standards for stock-based employee
compensation plans. SFAS No. 123 permits an entity to either record the
effects of stock-based employee compensation plans in its financial statements
or present pro forma disclosures in the notes to the financial statements. In
connection with the adoption of SFAS No. 123 during 1996, the Company will
elect to provide the appropriate disclosures in the notes to its financial
statements. Since the Company does not expect to make significant equity
awards to outsiders, adoption of SFAS No. 123 is not expected to have a
material impact on the Company's results of operations, financial position or
cash flows.
 
                                      28
<PAGE>
 
                                   BUSINESS
 
  Lightbridge, Inc. ("Lightbridge" or the "Company") develops, markets and
supports a suite of integrated products and services that enable wireless
telecommunications carriers to improve their customer acquisition and
retention processes. The Company's comprehensive software-based solutions are
delivered primarily on an outsourcing and service bureau basis, which allows
wireless carriers to focus internal resources on their core business
activities.
 
  The Company offers on-line, real-time transaction processing and call center
support solutions to aid carriers in qualifying and activating applicants for
wireless service, as well as software-based sales support services for
traditional distribution channels, such as dealers, agents and direct mobile
sales forces, and emerging distribution channels, such as mass market retail
stores, home shopping and stand-alone kiosks. The Company develops and
implements interfaces that fully integrate its acquisition system with carrier
and third-party systems, such as those for billing, point-of-sale, acquisition
and order fulfillment. The Company recently introduced software-based decision
support tools and services that enable carriers to reduce subscriber churn and
to make more informed business decisions about their subscribers, markets and
distribution channels.
 
  The Company's current client base consists of 39 wireless telecommunication
clients, including 8 of the 12 largest domestic cellular carriers (based on
total population coverage) and the only 3 domestic carriers currently
delivering personal communications systems ("PCS") service. In the year ended
September 30, 1995, approximately 94% of the Company's revenues was
attributable to carriers that were also clients in the preceding fiscal year.
 
INDUSTRY OVERVIEW
 
  Wireless telecommunications services have been one of the fastest growing
areas of the U.S. telecommunications industry over the last 10 years. Cellular
service has represented the largest component of the wireless
telecommunications industry to date and has continued to grow rapidly in the
1990s as the market for cellular phones has evolved from serving early
adopters to serving mass market consumers. The Cellular Telecommunications
Industry Association (the "CTIA") estimates that the number of cellular
subscribers in the United States increased from 340,000 in December 1985 to
33.7 million in December 1995, representing a compounded annual growth rate of
58%. The CTIA also estimates that the market penetration of cellular service,
as measured by the percentage of the population that subscribes to a cellular
service, was approximately 13% as of December 1995.
 
  Other wireless telecommunications technologies, services and markets are
emerging. In the last year, the Federal Communications Commission (the "FCC")
has sold licenses for PCS, a digital technology with the potential to provide
enhanced communication quality and security, to more than 60 purchasers.
Certain of these purchasers are currently building the infrastructure required
to support PCS service, which is expected to compete with cellular service on
a nationwide basis. In addition, enhanced specialized mobile radio ("ESMR"), a
digital service typically found in fleet dispatch environments, is evolving as
another potential competitor of cellular service. Additional wireless
technologies and services are expected to continue to develop over the next 10
years, and industry sources estimate that by 2005 approximately 125 million
customers will subscribe to wireless telecommunications services in the United
States, representing a market penetration of 35% to 45%. The market for
wireless telecommunications services outside the United States has also grown
significantly in recent years and is expected to continue to do so through at
least the end of the decade. One industry analyst estimates that wireless
subscribers in Europe, for example, will increase from 18 million in 1995 to
78 million by the end of the year 2000, resulting in a market penetration of
approximately 20%.
 
  In addition to this rapid growth, a number of recent and anticipated events
are causing fundamental changes in the wireless telecommunications industry.
The industry continues to experience significant consolidation as cellular
carriers are seeking to achieve greater market coverage and economies of scale
in operations, marketing, customer service and support. While the number of
cellular service subscribers in the United States has grown
 
                                      29
<PAGE>
 
substantially in recent years, the average revenue per subscriber has declined
and is expected to decrease further. The CTIA has reported that revenue per
subscriber declined 47% from 1987 to 1995. Carriers are anticipating increased
price competition in the wireless telecommunications industry as providers of
PCS and other services enter the geographic markets previously served only by
cellular carriers. Moreover, as a result of the Telecommunications Act of
1996, carriers are beginning to offer wireless services bundled with wireline
services. These changes are causing carriers to seek new ways to reduce their
costs and interact more effectively with their subscribers.
 
  The process by which a wireless carrier acquires a subscriber is costly and
complex. The Company estimates, based on its market research, that acquisition
costs typically range from $350 to $500 per subscriber, with the largest
portion of those costs consisting of commissions and promotional items, such
as subsidies on telephones. Carriers typically offer a variety of rate plans,
features and special promotions that change on a regular basis, often making
the customer acquisition process complicated for both sales representatives
and applicants for service. The complexity of the customer acquisition process
has been exacerbated by the recent consolidation of participants in the
wireless industry, which has resulted in many carriers employing a number of
different legacy systems for credit verification, activation and billing that
are not integrated or even compatible. These problems are expected to be
magnified for carriers seeking to offer bundled wireless and wireline
services. Carriers are therefore seeking ways to reduce the costs and simplify
the process of customer acquisition.
 
  Acquiring a wireless subscriber is a time-consuming process. The Company's
market research has indicated that, while the entire acquisition process
typically takes between 15 and 30 minutes, it is not unusual for the process
to take up to an hour. Carriers' employees or agents are often required to
make duplicate data entries into separate computer systems in order to
complete the acquisition process. If a carrier is unable to complete the
process of acquiring a potential customer in a single transaction, the
customer may decide to become a subscriber of another carrier or not to
subscribe to the service at all. Therefore, carriers that are able to provide
a more simplified, expedited sales process have a competitive advantage.
 
  Distribution channels for wireless telecommunications services are also
changing. In the 1980s, substantially all wireless subscriber acquisitions
were made through channels such as dealers, agents and direct mobile sales
forces. Today carriers also reach potential subscribers through home shopping,
telemarketing and a variety of other retail distribution methods and may begin
marketing on the Internet. These new distribution channels require that
carriers implement new processes for marketing, qualifying and activating new
subscribers.
 
  Because of declining revenue per subscriber, carriers must retain
subscribers for a longer period in order to recover their acquisition costs.
Carriers therefore need to reduce their "churn" rates, which measure the
extent to which subscribers switch to another carrier's services or otherwise
cease to use a carrier's services. Churn has historically been a problem for
wireless carriers, which have had an average annual subscriber turnover rate
between 25% and 30%. The Company believes that churn may, in part, be
attributed to frustration on the part of subscribers resulting from confusion
about the broad and changing variety of available service options and the
complexity of billing practices, as well as dissatisfaction with the scope and
quality of service. In the face of increased competition and growth in the
subscriber base, churn is expected to become an increasingly costly problem
for carriers.
 
  In order to reduce costs and remain competitive, carriers are also seeking
to address subscriber fraud. Fraud in the wireless telecommunications industry
is generally divided into two categories: technical fraud, which often
involves copying or manipulating a cellular telephone's mobile identification
number or electronic serial number; and subscription fraud, in which
individuals obtain service using false information. Technical fraud can be
addressed by changing the ways in which calls are processed. Subscription
fraud, however, is most effectively addressed in the customer acquisition
process. One industry source estimates that in 1995 subscription fraud
generated losses to the industry of over one percent of total industry
revenues, or approximately $180 million, and could grow to $500 million by the
year 2000 if it is not controlled.
 
                                      30
<PAGE>
 
  The development of new wireless services, carriers and technologies, the
emergence of the mass market for wireless services and increased competition
have created an environment in which successful carriers must be able to
better utilize data and statistical tools to manage their businesses. Carriers
are beginning to recognize the need to utilize "data warehouses," repositories
of business data organized for analysis, and to acquire the tools necessary
for business managers to access and analyze the data.
 
  The Company believes that established wireless carriers increasingly are
considering outsourcing qualification and activation services as a means by
which they can improve flexibility and efficiency while focusing internal
resources on their core business activities. Further, the Company believes
that many new entrants to the wireless market, such as PCS providers, are
considering outsourcing portions of their customer acquisition requirements as
an attractive means of expediting their introduction of new services.
 
THE LIGHTBRIDGE SOLUTION
 
  Lightbridge's suite of complementary software-based products and services
permits a wireless carrier to select applications and functions to create an
integrated, customized solution addressing its particular needs. The Company's
solutions include:
 
  .  The Customer Acquisition System ("CAS") provides on-line, real-time
     transaction processing services that utilize and interface with
     proprietary and third-party databases to expedite the qualification and
     activation of applicants for wireless service on a cost-effective basis.
 
  .  TeleServices consists of call center services that assist wireless
     carriers in acquiring and activating applicants, using either
     Lightbridge's CAS or the carrier's own customer acquisition systems.
     Lightbridge's TeleServices Group also offers telemarketing and customer
     care activities that assist carriers in acquiring subscribers through
     new distribution channels and retaining existing subscribers.
 
  .  Channel Solutions consist of software-based products and services
     designed to simplify and expedite the customer acquisition process
     through both existing and emerging distribution channels and to provide
     wireless carriers with flexibility to capitalize on emerging
     distribution channels.
 
  .  Wireless Intelligence solutions are software-based decision support
     tools and services designed to enable carriers to make more informed
     business decisions about their subscribers, markets and distribution
     channels.
 
  .  Business Integration solutions include consulting services, software and
     tools to link the Company's acquisition systems with carrier and third-
     party systems, such as those for billing, point-of-sale, activation and
     order fulfillment.
 
  The Company's services are delivered primarily on an outsourcing and service
bureau basis, which allows carriers to focus internal resources on their core
business activities. Lightbridge's solutions combine the advantages of
distributed access and workflow management, centrally managed client-specified
business policies, and links to carrier and third-party systems. The open
architecture underlying the Company's software applications supports the
development of flexible, integrated solutions, regardless of the type of
wireless service provided by a client and independent of the client's
computing environment.
 
STRATEGY
 
  The Company's objective is to be the leading provider of innovative,
software-based solutions for cost-effective customer acquisition and retention
for the wireless telecommunications industry. The Company's strategy is based
on the following key elements:
 
 Continue to Focus on Wireless Telecommunications Industry
 
  The Company believes that the wireless industry will continue to grow
rapidly and will be characterized by both increased competition and heightened
subscriber expectations. As a result, the Company believes there will
 
                                      31
<PAGE>
 
be significant opportunities to provide carriers with products and services
that enable carriers to focus their internal resources on building and
managing their telecommunications networks, while outsourcing certain
administrative and other functions. By focusing on the wireless
telecommunications industry, the Company has developed significant expertise
and experience that it intends to employ in providing innovative, flexible
solutions to address the changing needs of wireless carriers in both existing
and emerging markets.
 
 Provide Complete Solutions to Clients
 
  Based on its expertise in the wireless industry, Lightbridge seeks to offer
complete solutions to wireless carriers, particularly in addressing issues of
customer acquisition, fraud and retention. Lightbridge's suite of software-
based products and services permits a wireless carrier to select applications
and functions to create an integrated, customized solution addressing its
particular needs. The Company's services are delivered primarily on an
outsourcing and service bureau basis, which allow carriers to focus internal
resources on their core business activities. The Company supports its product
and service offerings with consulting in related areas such as workflow
analysis, requirements definition, credit policy, fraud prevention, channel
management and churn control.
 
 Continue Commitment to Technological Leadership
 
  Lightbridge's products and services are based on its proprietary software
technology, which is enhanced regularly to address the evolving needs of
wireless carriers. The Company has designed, developed and implemented an open
application programming interface and related software specifically to enable
the Company to provide flexible, fully integrated solutions to clients with
differing needs. The Company has developed and implemented interfaces to more
than 30 disparate systems, including carrier legacy systems and third-party
systems, such as billing, point-of-sale, activation and order fulfillment.
Drawing on its industry and technological expertise, the Company has developed
products that enable carriers to access the Company's services through a
variety of emerging distribution channels, as well as software-based decision
support tools that assist carriers in analyzing their distribution channel
performance and churn experience. The Company intends to leverage and expand
this capability to offer solutions to wireless carriers, regardless of the
type of wireless service (cellular, PCS, ESMR or other) being offered by a
client and independent of the client's computing environment.
 
 Foster Long-Term Client Relationships
 
  The Company's strategy is to use its reputation and experience in servicing
leading wireless carriers to market additional products and services to those
clients and to attract new clients. In the year ended September 30, 1995,
approximately 97% of the Company's total revenues was derived from carriers
who were also clients in the preceding fiscal year. Lightbridge has developed
long-term consultative relationships with many of the leading wireless
carriers in the United States. The experience and expertise gained in these
relationships will assist the Company in identifying emerging client needs and
developing solutions to address those needs.
 
 Leverage and Expand Strategic Relationships
 
  An important part of Lightbridge's strategy is to establish strong working
relationships with other suppliers to the wireless industry. The Company
enters into these relationships to increase the functionality of its products
and services and to reduce the time to market for its new products and
services. The Company believes these relationships also provide the Company
with access to the marketing resources and credibility of larger, more
established participants in the wireless industry. Lightbridge's relationships
with Pilot Software, Inc. (a subsidiary of Dun & Bradstreet), Trans Union
Corporation and XcelleNet, Inc., for example, have provided the Company with
access to technology and joint development and marketing efforts that have
enabled the Company to offer more fully featured products and services in a
shorter period of time. The Company intends to explore ways to expand such
relationships and seek out opportunities to develop new strategic
relationships.
 
                                      32
<PAGE>
 
 Expand into International Wireless Telecommunications Markets
 
  While the Company has offered its products and services only in the United
States to date, it believes the significant growth in international wireless
telecommunications markets will require carriers in those markets to address
many of the same issues currently confronting domestic wireless carriers. The
Company intends to leverage its long-term client relationships and strategic
partnerships to facilitate and expedite the Company's entry into rapidly
expanding international wireless markets.
 
PRODUCTS AND SERVICES
 
  Lightbridge's suite of software-based products and services permits a
wireless carrier to select applications and functions to create an integrated,
customized solution addressing its particular needs. Lightbridge's products
and services are provided by five solutions groups:
 
        GROUP                                        FUNCTIONS
 
Customer Acquisition Services        On-line, real-time transaction processing
                                     services to aid wireless carriers in
                                     qualifying and activating applicants for
                                     wireless service, including proprietary
                                     databases and processing modules to
                                     evaluate existing subscribers and detect
                                     potential subscription fraud.
 
TeleServices                         Call center support services to assist
                                     wireless carriers in acquiring and
                                     activating applicants for wireless
                                     service, including qualification and
                                     activation, analyst reviews,
                                     telemarketing to existing and new
                                     subscribers, back-up and disaster
                                     recovery for acquisition and activation
                                     services, and customer care.
 
Channel Solutions                    Software products and services to support
                                     a variety of distribution channels,
                                     including software applications for in-
                                     store use, laptop applications for mobile
                                     sales professionals and an interactive
                                     multimedia kiosk.
 
Wireless Intelligence                Software-based decision support tools and
                                     related consulting services to allow
                                     wireless carriers to access data and
                                     analyze the marketplace in order to make
                                     more informed business decisions about
                                     their customers, markets and distribution
                                     channels.
 
Business Integration                 Consulting services, software and tools
                                     to link wireless carrier legacy systems
                                     and third-party systems to the Company's
                                     systems, as well as other consulting
                                     services to help wireless carriers
                                     improve business processes.
 
                                      33
<PAGE>
 
 Customer Acquisition System
 
  CAS includes on-line, real-time transaction processing services for the
qualification and activation of applicants for wireless service. The following
chart illustrates the utilization of CAS:

[Image of boxes representing sequence of events as follows:

    Box 1: Customer indicates intent to purchase phone. Agent enters information
           into POPS terminal

    Box 2: CAS validates application for completeness & format

    Box 3: Application transmitted to Lightbridge via dial-up, leased line or 
           network connection

    Box 4: Lightbridge checks InSight and Fraud Sentinel and retrieves credit 
           bureau report to evaluate application

        IF HIGH RISK [arrow points to alternate box]

    Box 4A: Confirmation sent to agent indicating security deposit required

    Box 5: CAS transmits information to billing system; phone activated in 
           switch

    Box 6: Confirmation sent to agent with customer name, mobile number & 
           account number
 
    Box 7: Customer leaves store with activated phone]


  CAS accepts applicant information on-line from a variety of carrier
distribution points, such as retail stores. Upon receipt of information, the
system begins a series of steps required to determine the applicant's
qualification for the carrier's service through inquiry into Company
proprietary databases, such as ProFile, and external sources, such as credit
bureaus. The complete applicant file is evaluated by the system and a
determination regarding the applicant's creditworthiness is made based on
centrally managed client-specified business policies. If an issue is raised
regarding qualification of an applicant, the system routes the application to
a Company or carrier credit analyst for review and action. The point-of-sale
is then notified when a determination is made. If service is to be activated
at that time, the system receives, verifies and translates the information
necessary to establish the billing account and activate service, transmitting
data to the carrier's billing and activation systems. Throughout the process,
Lightbridge's client/server system manages the routing of the application and
the flow of information, both within the system and, as necessary, to
appropriate individuals for their involvement, all in a secure, controlled
environment.

  Introduced in 1989 and enhanced over time, CAS had processed over 12 million
applications for wireless service through June 1996. CAS typically enables
carriers to qualify applicants and activate service in five to ten minutes
while screening for subscriber fraud, thereby assisting the carriers to close
sales at the time when the customer is ready to purchase. Although CAS
typically requires no human intervention beyond the initial data entry, it
permits a carrier to implement policies requiring analyst intervention in
carrier-specified situations. When intervention is required, CAS facilitates
the on-line handling of exceptions by, among other things, queuing exceptions
to manage workflow. CAS includes the following modules, all of which are fully
integrated:
 
  .  Credit Decision System ("CDS") is an integrated qualification system for
     carriers to acquire qualified applicants rapidly. Using redundant, high-
     speed data lines to five major credit bureaus, CDS typically provides
     consumer and business credit decisions in under 20 seconds, based on
     automated analysis of credit information using a credit policy specified
     by the carrier. CDS can be integrated with a carrier's existing customer
     acquisition and billing systems and can be modified quickly to reflect
     changes in a carrier's credit policies.
 
  .  Fraud Sentinel is a suite of fraud management tools, available
     separately or together. The Company believes that Fraud Sentinel is the
     only pre-screening tool for detection and prevention of subscription
     fraud available in the wireless industry today. The components of Fraud
     Sentinel are:
 
 
                                      34

<PAGE>
 
    ProFile, a proprietary intercarrier database of accounts receivable
    write-offs and service shut-offs, provides on-line pre-screening of
    applicants, on-going screening of existing subscribers, and
    notification if an application is processed for a subscriber whose
    account has been previously written off by a carrier.
 
    Fraud Detect, a multifaceted fraud detection tool provided under
    agreement with Trans Union Corporation, analyzes data such as an
    applicant's Social Security Number, date of birth, address, telephone
    number and driver's license information and identifies any
    discrepancies. Fraud Detect became commercially available through
    Lightbridge in the second quarter of 1996.
 
    Postalpro, a tool to validate addresses, will enable a carrier to
    detect false addresses, incorrect ZIP codes and contradictions between
    addresses and ZIP codes before a potential subscriber's service is
    activated. Postalpro is currently expected to become commercially
    available by the first quarter of 1997.
 
  .  InSight is a proprietary database containing information about existing
     accounts and previous applicants. InSight also evaluates existing
     subscribers who apply for additional services on the basis of their
     payment histories. InSight can decrease costs for carriers by reducing
     the number of credit bureau inquiries and the number of applications
     requiring manual review.
 
  .  Workstation Offerings present data electronically to the appropriate
     person for decision or action and then automatically route data to the
     next step in the process. Workstation Offerings are:
 
    Credit Workstation allows a carrier's credit analyst to enter
    information or to evaluate applications that were entered at a remote
    location.
 
    Activation Workstation allows the user to review, correct or reprocess
    activation requests returned from the billing system due to an error.
 
    Fulfillment Workstation provides the information necessary to fulfill
    orders for wireless handsets and accessories at a remote or third-party
    fulfillment operation.
 
  Pricing of CAS is on a per qualification or activation basis and varies
substantially with the term of the contract under which services are provided,
the volume of transactions, and the other products and services selected and
integrated with the services.
 
 TeleServices
   
  The Company's TeleServices Group provides a range of call center support
solutions for the subscriber acquisition and activation process. The Company
first offered a TeleServices call center solution to the wireless marketplace
in 1990 with its 800-FOR-CREDIT service. Since that time, the Company's
TeleServices offerings have expanded to include not only credit decisions and
activations, but also analyst reviews, telemarketing to existing and new
subscribers, back-up and disaster recovery for acquisition and activation
services, and customer care. TeleServices solutions can be provided using CAS
or a carrier's own customer acquisition system. The Company's clients
typically utilize TeleServices solutions as part of an overall sales and
distribution strategy to expand or engage in special projects without
incurring the overhead associated with building and maintaining a call center.
As of August 26, 1996, the TeleServices Group included a total of 176 full-
time and part-time employees, which number fluctuates with the number of
transactions processed. Pricing of TeleServices solutions is on a per
transaction or per minute basis and varies with the term of the contract under
which services are provided, the volume of transactions processed and the
other products and services selected and integrated with the services.     
 
 Channel Solutions
 
  The Company's Channel Solutions consist of products and services that
support a growing range of distribution channels. The components of Channel
Solutions include:
 
  .  POPS, a Windows-based application typically used in carrier-owned or
     dealer/agent store locations, features a graphical user interface that
     allows even inexperienced sales staff to conduct qualification
 
                                      35
<PAGE>
 
     and activation transactions quickly via a dial-up or network connection
     to CAS. Two of the Company's clients have licensed POPS for more than
     500 installed locations. POPS is being marketed both as a new solution
     and as a replacement to the Company's DOS-based application, which is
     currently licensed for more than 800 locations.
 
  .  SAMS, a laptop application, provides a "virtual office" for carriers'
     mobile sales professionals. The SAMS suite contains a number of tools
     needed by sales staff, such as coverage maps and product catalogs, as
     well as the ability to handle qualification and activation transactions
     via landline, cellular or wireless data connection to CAS. Third-party
     modules can be integrated into SAMS to provide additional functionality.
     One of the Company's clients has licensed SAMS for approximately 600
     users.
 
  .  Iris, an interactive multimedia kiosk, uses touch screen technology to
     provide potential subscribers with educational information ranging from
     the basic operation of a cellular telephone to the form of monthly
     bills, display the carrier's coverage area and provide information about
     available services and telephone models. Iris incorporates a credit card
     reader for payments and allows a customer to purchase a telephone and
     complete an application for service, which can then be processed
     automatically. Iris can dispense a telephone itself or can provide for
     delivery or in-store pick-up. Iris became commercially available in
     December 1995.
 
  POPS, SAMS and Iris are licensed to clients and require customization and
integration with other products and systems to varying degrees. Pricing of
POPS, SAMS and Iris varies with the configurations selected, the number of
locations licensed and the degree of customization required.
 
 Wireless Intelligence
 
  The Company's Wireless Intelligence Group provides software-based decision
support tools to help carriers analyze their marketplace to improve business
operations. As carriers encounter increasing competition and a growing and
changing market, the Company believes that the ability to gather, analyze and
interpret business data and then take appropriate actions will be essential to
their success. Wireless Intelligence is currently comprised of the following
two modules:
 
  .  Channel Wizard allows a carrier to analyze its distribution channel
     performance by market, subscriber type or other factors, to assist the
     carrier in making decisions designed to reduce customer acquisition
     costs and improve channel performance. Channel Wizard is designed to
     provide up-to-date information in a format that is easy for users
     without statistical training to operate. Channel Wizard became
     commercially available in the second quarter of 1996.
 
  .  Churn Prophet is an analytical tool designed to help carriers reduce
     churn and increase customer retention. Churn Prophet uses predictive
     modeling technology to identify characteristics of subscribers who have
     canceled service in the past and to develop predictions as to which
     subscribers are likely to cancel service in the future. Customer
     retention efforts can then be targeted more cost effectively to the
     subscribers most likely to cancel service. Churn Prophet is currently
     expected to become commercially available in late 1996.
 
  Channel Wizard and Churn Prophet are licensed to clients and require
customization and integration with other products and systems to varying
degrees. Pricing of Channel Wizard and Churn Prophet varies with the number of
users and the degree of customization required.
 
 Business Integration
 
  The Company's Business Integration Group provides consulting, software and
tools to link carrier and third-party systems to the Company's systems. To
facilitate the development of these interfaces, Lightbridge developed
CAS COMM, a library of software functions for the remote host that enables
third-party systems to connect to CAS. CAS COMM is an application layer
protocol that gives CAS the appearance of a local process
 
                                      36
<PAGE>
 
to the third-party system. CAS COMM runs on DEC VMS, Microsoft Windows NT and
certain Unix platforms and supports both TCP/IP and DECnet. To date, the
Business Integration Group has implemented more than 35 such interfaces, of
which 13 use CAS COMM.
 
  The Business Integration Group also provides a range of other consulting
services to wireless carriers, employing the Company's expertise and
experience in the wireless telecommunications industry. For example, the
Business Integration Group helps carriers develop solutions for work flow
optimization, management of bad debt, distribution channel analysis, sales
automation, churn analysis and data warehouse design. The Company generally
charges for consulting services on a per diem basis, but occasionally
undertakes smaller consulting projects on a fixed-fee basis.
 
TECHNOLOGY
 
  The Company's development efforts have created a proprietary multi-layered
software architecture that facilitates the development of application
products. This design conforms to the three standard tiers of (1) presentation
(front-ends), (2) business logic and (3) database services, each independent
of the others. The architecture supports the development of Lightbridge's core
products and provides a discrete platform that enables the rapid creation of
client-specific requirements. In addition, the architecture is open in terms
of its ability to interface with third-party systems, as well as with the
Company's Windows-based products. Lightbridge can therefore offer its clients
the ability to use and enhance legacy systems and third-party systems (such as
billing systems) while implementing the market-oriented products offered by
the Company.
 
  At the most fundamental layer of its architecture, Lightbridge has written a
common, independent library of code that provides a foundation for reusability
and, equally importantly, independence from hardware platforms and operating
systems. The common library currently supports Unix and OpenVMS. The
Lightbridge products are, therefore, portable and able to run on the most
suitable hardware platform for the computing needs.
 
  A critical element of the Company's development has been the creation and
enhancement of Allegro, a peer-to-peer, client/server, transaction management
system. Allegro encapsulates a sequence of independent, application servers
into a complete transaction, customized for the client's customer acquisition
requirements. The solutions may include front-end data capture, customer
qualification, fulfillment of physical distribution and connectivity to back
office systems such as billing. To an individual user, however, Lightbridge
products offer the front-end appearance of a "single virtual machine." Allegro
features include data validation, exception handling, process queues, manual
review queues and transaction monitors.
 
  Lightbridge servers each perform only a single function, without knowledge
of the other steps in the transaction processes or their computing
environment. Third-party software products are encapsulated so that they are
integrated seamlessly into the Allegro system. As a result, the Allegro
network is scalable and includes software redundancy.
 
  The wireless marketplace continues to grow rapidly and requires quick
reaction to evolving market conditions. To meet this requirement, the Company
has incorporated a set of software and tools with which its trained staff can
provide the rapid customization of front-ends, business rules, system
interfaces and reporting. The customization is independent of the core
products, so that Lightbridge can provide client-specific enhancements while
continuing to develop regular releases of major product enhancements.
 
 
                                      37
<PAGE>
 
CLIENTS
 
  The Company provides its products and services to wireless carriers across
the United States. The Company's current client base consists of 39 wireless
telecommunication clients, including 8 of the 12 largest domestic cellular
carriers (based on total population coverage) and the only 3 domestic carriers
currently delivering PCS service. In the year ended September 30, 1995,
approximately 94% of the Company's revenues was attributable to carriers that
were also clients in the preceding fiscal year. Lightbridge's clients include:
 
<TABLE>
<CAPTION>
       CELLULAR CARRIERS                            PCS CARRIERS
       -----------------                            ------------
<S>                                     <C>
AT&T Wireless Services, Inc.            American Personal Communications
CommNet Cellular Inc.                   (an affiliate of Sprint Spectrum L.P.)
Comcast Cellular Communications, Inc.   BellSouth Mobility DCS, Inc.
Century Cellunet, Inc.                  Powertel, Inc.
GTE Mobile Communications Service Cor-  Sprint Spectrum L.P.
 poration
Palmer Wireless, Inc.                   Western Wireless Corporation
Southwestern Bell Mobile Systems, Inc.
</TABLE>
 
  Revenues attributable to the Company's 10 largest clients accounted for
approximately 85%, 90% and 90% of the Company's revenues in the years ended
September 30, 1993, 1994 and 1995, respectively. Four clients each accounted
for greater than 10% of the Company's revenues in the years ended September
30, 1994 and 1995. GTE Mobile Communications Service Corporation ("GTE
Mobile") accounted for 31% of the Company's revenues for the year ended
September 30, 1995, and each of AT&T Wireless Services, Inc. ("AT&T
Wireless"), Comcast Cellular Communications, Inc. ("Comcast") and Ameritech
Mobile Communications, Inc. d/b/a Ameritech Cellular Services ("Ameritech")
accounted for greater than 10% of the Company's revenues for that fiscal year.
During 1996, GTE Mobile is changing the way it accesses the Company's Customer
Acquisition System from using the call center support solutions provided by
the Teleservices Group to using on-line access. As a result, the Company
expects the revenues from GTE Mobile to decrease significantly during 1996 and
1997. Ameritech has notified the Company of its intent to terminate its
agreements with the Company, effective in the fourth calendar quarter of 1996.
See "Risk Factors--Dependence on Certain Clients," "Management's Discussion
and Analysis of Financial Condition and Results of Operations--Overview" and
Note 2 of Notes to Financial Statements.
 
  The Company's agreements with its clients set forth the terms on which the
Company will provide products and services for the client, but do not
typically require the clients to purchase any particular type or quantity of
the Company's products or services or to pay any minimum amount for products
or services. The Company's agreement with GTE Mobile and certain of its
subsidiaries provides that the contract may be terminated by GTE Mobile as of
June 30 of any year upon 60 days' prior notice. In addition, if the Company
fails to meet certain performance criteria, GTE Mobile may, among other
things, terminate the agreement upon 30 days' prior written notice. The
Company has an agreement with AT&T Wireless for the provision of credit
decision services. The agreement will expire on December 31, 1996 unless it is
terminated earlier, upon not less than 60 days' prior written notice. The
Company's agreement with Comcast provides that it may be terminated upon 90
days' written notice following December 31, 1996, upon failure of either party
to comply with the terms of the agreement within 30 days after written notice
of such failure or upon bankruptcy or insolvency. The Company has agreements
with Ameritech and certain of its affiliates that may be terminated upon 90
days' prior written notice by either party thereto or upon 30 days' written
notice in the event of failure by the other party to comply with the terms of
the agreement. None of the foregoing agreements requires that the client
either purchase any particular type or quantity of the Company's products or
services or pay any minimum amount for products or services.
 
  Because the PCS industry is in its initial stages of development, clients in
the PCS market have not generated significant revenues for the Company to
date. The Company supplies service to American Personal Communications (an
affiliate of Sprint Spectrum L.P.) in Washington, D.C., Western Wireless
Corporation in Hawaii and certain Western states and BellSouth Mobility DCS,
Inc. in certain Southeastern states. These three
 
                                      38
<PAGE>
 
corporations are the only three carriers currently providing PCS service.
There can be no assurance that the PCS market will develop as expected. See
"Risk Factors--Dependence on Cellular Market and Emerging Wireless Markets."
 
SALES AND MARKETING
 
  The Company's sales strategy is to establish, maintain and foster long-term
relationships with its clients. The Company's sales and client services
activities are led by "relationship teams," each of which includes a senior
management team sponsor. The Company's sales force currently consists of 8
relationship managers who report to a senior sales and marketing executive.
The Company employs a team approach to selling in order to develop a
consultative relationship with existing and prospective clients. Directors of
solutions groups and product managers, as well as other executive, technical,
operational and consulting personnel, are frequently involved in the business
development and sales process. The teams conduct needs assessments and,
working with the client, develop a customized solution to meet the client's
particular needs. The sales cycle for the Company's products and services is
typically 6 to 12 months. See "Risk Factors--Potential Fluctuations in
Quarterly Performance."
 
  The Company plans to expand its sales and marketing group during 1996 by
hiring additional staff experienced in the wireless telecommunications
industry. See "Management's Discussion and Analysis of Financial Condition and
Results of Operations--Overview" and "--Results of Operations--Six Months
Ended June 30, 1996 Compared with Six Months Ended June 30, 1995."
 
  The Company's marketing activities include advertising, participation in
industry trade shows and panels, substantive articles in trade journals and
targeted direct mail.
 
ENGINEERING, RESEARCH AND DEVELOPMENT
 
  Lightbridge considers its on-going efforts in engineering, research and
development to be a key component of its strategy. The Company believes that
its future success will depend in part on its ability to continue to enhance
its existing product and service offerings and to develop new products and
services to allow carriers to respond to changing market requirements. The
Company's research and development activities consist of both long-term
efforts to develop and enhance products and services and short-term projects
to make modifications to respond to immediate client needs.
 
  In addition to internal research and development efforts, the Company
intends to continue its strategy of gaining access to new technology through
strategic relationships and acquisitions where appropriate.
   
  The Company spent approximately $1.1 million, $2.3 million and $3.9 million
on engineering, research and development in the years ended September 30,
1993, 1994 and 1995, respectively. As of August 26, 1996, Lightbridge had 50
employees engaged in engineering, research and development.     
 
COMPETITION
 
  The market for services to wireless carriers is highly competitive and
subject to rapid change. The market is fragmented, and a number of companies
currently offer one or more services competitive with those offered by the
Company. In addition, many wireless carriers are providing or can provide,
internally, products and services competitive with those the Company offers.
Trends in the wireless telecommunications industry, including greater
consolidation and technological or other developments that make it simpler or
more cost-effective for wireless carriers to provide certain services
themselves, could affect demand for the Company's services and could make it
more difficult for the Company to offer a cost-effective alternative to a
wireless carrier's own capabilities. In addition, the Company anticipates
continued growth in the wireless carrier services industry and, consequently,
the entrance of new competitors in the future.
 
                                      39
<PAGE>
 
  The Company believes that the principal competitive factors in the wireless
carrier services industry include the ability to identify and respond to
subscriber needs, quality and breadth of service offerings, price and
technical expertise. The Company believes that its ability to compete also
depends in part on a number of competitive factors outside its control,
including the ability to hire and retain employees, the development by others
of products and services that are competitive with the Company's products and
services, the price at which others offer comparable products and services and
the extent of its competitors' responsiveness to subscriber needs.
 
  Many of the Company's current and potential competitors have significantly
greater financial, marketing, technical and other competitive resources than
the Company. As a result, the Company's competitors may be able to adapt more
quickly to new or emerging technologies and changes in subscriber requirements
or may be able to devote greater resources to the promotion and sale of their
products and services. There can be no assurance that the Company will be able
to compete successfully with its existing competitors or with new competitors.
In addition, competition could increase if new companies enter the market or
if existing competitors expand their service offerings. An increase in
competition could result in price reductions or the loss of market share by
the Company and could have a material adverse effect on the Company's
business, financial condition, results of operations and cash flow.
 
  To remain competitive in the wireless carrier services industry, the Company
will need to continue to invest in engineering, research and development, and
sales and marketing. There can be no assurance that the Company will have
sufficient resources to make such investments or that the Company will be able
to make the
technological advances necessary to remain competitive. In addition, current
and potential competitors have established or may in the future establish
collaborative relationships among themselves or with third parties, including
third parties with whom the Company has a relationship, to increase the
visibility and utility of their products and services. Accordingly, it is
possible that new competitors or alliances may emerge and rapidly acquire a
significant market share. If this were to occur, the Company's business,
financial condition, results of operations and cash flow could be materially
and adversely affected.
 
GOVERNMENT REGULATION
 
  The FCC, under the terms of the Communications Act of 1934, as amended,
regulates interstate communications and use of the radio spectrum. Although
the Company is not required to and does not hold any licenses or other
authorizations issued by the FCC, the wireless carriers that constitute the
Company's clients are regulated at both the federal and state levels. Federal
and state regulation may decrease the growth of the wireless
telecommunications industry, affect the development of the PCS or other
wireless markets, limit the number of potential clients for the Company's
services, impede the Company's ability to offer competitive services to the
wireless telecommunications market, or otherwise have a material adverse
effect on the Company's business, financial condition, results of operations
and cash flow. The Telecommunications Act of 1996, which in large measure
deregulated the telecommunications industry, has caused, and is likely to
continue to cause, significant changes in the industry, including the entrance
of new competitors, consolidation of industry participants and the
introduction of bundled wireless and wireline services. Those changes could in
turn subject the Company to increased pricing pressures, decrease the demand
for the Company's products and services, increase the Company's cost of doing
business or otherwise have a material adverse effect on the Company's
business, financial condition, results of operations and cash flow.
 
  As a result of offering its ProFile product, the Company is subject to the
requirements of the Fair Credit Reporting Act. Although the Company's business
activities are not otherwise within the scope of federal or state regulations
applicable to credit bureaus and financial institutions, the Company must take
into account such regulations in order to provide products and services that
help its clients comply with such regulations. The Company monitors regulatory
changes and implements changes to its products and services as appropriate.
Although the Company attempts to protect itself by written agreements with its
clients, failure to reflect the provisions of such regulations in a timely or
accurate manner could possibly subject the Company to liabilities that could
have a material adverse effect on the Company's business, financial condition,
results of operations and cash flow.
 
                                      40
<PAGE>
 
PROPRIETARY RIGHTS
 
  The Company's success is dependent upon proprietary technology. The Company
relies on a combination of copyrights, the law of trademarks, trade secrets
and employee and third-party non-disclosure agreements to establish and
protect its rights in its software products and proprietary technology. The
Company protects the source code versions of its products as trade secrets and
as unpublished copyrighted works, and has internal policies and systems
designed to limit access to and require the confidential treatment of its
trade secrets. The Company generally operates its Credit Decision System
software on an outsourcing basis for its clients. In the case of its Channel
Solutions and Wireless Intelligence products, the Company provides the
software under license agreements which grant clients the right to use, but
contain various provisions intended to protect the Company's ownership of and
the confidentiality of the underlying copyrights and technology. The Company
requires its employees and other parties with access to its confidential
information to execute agreements prohibiting unauthorized use or disclosure
of the Company's technology. In addition, all of the Company's employees have
entered into non-competition agreements with the Company.
 
  There can be no assurance that the steps taken by the Company to protect its
proprietary rights will be adequate to prevent misappropriation of its
technology or independent development by others of similar technology. It may
be possible for unauthorized parties to copy certain portions of the Company's
products or
reverse engineer or obtain and use information that the Company regards as
proprietary. The Company has no patents and existing copyright and trade
secret laws offer only limited protection. The Company's non-competition
agreements with its employees may be enforceable only to a limited extent, if
at all. In addition, the laws of some foreign countries do not protect the
Company's proprietary rights to the same extent as do the laws of the United
States. The Company has been and may be required from time to time to enter
into source code escrow agreements with certain clients and distributors,
providing for release of source code in the event the Company breaches its
support and maintenance obligations, files for bankruptcy or ceases to
continue doing business.
 
  The Company's competitive position may be affected by limitations on its
ability to protect its proprietary information. However, the Company believes
that patent, trademark, copyright, trade secret and other legal protections
are less significant to the Company's success than other factors, such as the
knowledge, ability and experience of the Company's personnel, new product and
service development, frequent product enhancements, customer service and
ongoing product support.
 
  The Company's agreement with Trans Union Corporation provides Lightbridge
with an exclusive right to market the Fraud Detect product to named accounts.
The Company's agreement with Pilot Software, Inc. provides a non-exclusive
license to use certain software and documentation. Certain other technologies
used in the Company's products and services are licensed from third parties.
The Company generally pays license fees on these technologies and believes
that if the license for any such third-party technology were terminated, it
would be able to develop such technology internally or license equivalent
technology from another vendor, although no assurance can be given that such
development or licensing can be effected without significant delay or expense.
 
  Although the Company believes that its products and technology do not
infringe on any existing proprietary rights of others, there can be no
assurance that third parties will not assert such claims against the Company
in the future or that such future claims will not be successful. The Company
could incur substantial costs and diversion of management resources with
respect to the defense of any claims relating to proprietary rights, which
could have a material adverse effect on the Company's business, financial
condition, results of operations and cash flow. Furthermore, parties making
such claims could secure a judgment awarding substantial damages, as well as
injunctive or other equitable relief, which could effectively block the
Company's ability to make, use, sell, distribute or market its products and
services in the United States or abroad. Such a judgment could have a material
adverse effect on the Company's business, financial condition, results of
operations and cash flow. In the event a claim relating to proprietary
technology or information is asserted against the Company, the Company may
seek licenses to such intellectual property. There can be no assurance,
however, that such a license could be
 
                                      41
<PAGE>
 
obtained on commercially reasonable terms, if at all, or that the terms of any
offered licenses will be acceptable to the Company. The failure to obtain the
necessary licenses or other rights could preclude the sale, manufacture or
distribution of the Company's products and, therefore, could have a material
adverse effect on the Company's business, financial condition, results of
operations or cash flow. The cost of responding to any such claim may be
material, whether or not the assertion of such claim is valid.
 
EMPLOYEES
   
  As of August 26, 1996, the Company had a total of 313 full-time and part-
time employees. Of these employees, 50 were employed in software and product
development, 49 in sales and marketing, client services and account
management, 15 in operations, 23 in finance and administration and 176 in
teleservices. The number of personnel employed by the Company varies
seasonally. See "Risk Factors--Potential Fluctuations in Quarterly
Performance." None of the Company's employees is represented by a labor union,
and the Company believes that its employee relations are good.     
 
  The future success of the Company will depend in large part upon its
continued ability to attract and retain highly skilled and qualified
personnel. Competition for such personnel is intense, particularly for sales
and marketing personnel, software developers and service consultants. See
"Risk Factors--Ability to Manage Change" and "--Dependence on Key Personnel."
 
PROPERTIES
 
  The Company's headquarters are located in a 39,000 square foot leased
facility, and the teleservices group is located in a 27,000 square foot leased
facility, both in Waltham, Massachusetts. The leases of these facilities
expire between 1999 and 2001. The Company believes its existing facilities are
adequate for its current needs and that suitable additional or substitute
space will be available as needed on commercially reasonable terms.
 
LEGAL PROCEEDINGS
 
  The Company is not currently party to any legal proceedings of a material
nature.
 
                                      42
<PAGE>
 
                                  MANAGEMENT
 
EXECUTIVE OFFICERS AND DIRECTORS
   
  The executive officers and directors of the Company and their ages as of
August 26, 1996 are as follows:     
 
<TABLE>       
<CAPTION>
              NAME           AGE                 POSITION
     ----------------------  --- ---------------------------------------
     <S>                     <C> <C>
     Pamela D.A. Reeve           President, Chief Executive Officer and
                              47 Director
     William G. Brown         36 Chief Financial Officer, Vice President
                                 of Finance and Administration and
                                 Treasurer
     Michael A. Perfit        40 Senior Vice President of Technology
     Richard H. Antell        48 Vice President of Software Development
     Douglas E. Blackwell     40 Vice President of Service Delivery
     Andrew I. Fillat(1)      48 Director
     Torrence C. Harder(1)    52 Director
     Douglas A. Kingsley(2)   34 Director
     D. Quinn Mills(2)        54 Director
</TABLE>    
- --------
(1) Member of the Compensation Committee
(2) Member of the Audit Committee
 
  PAMELA D.A. REEVE has served as the President of the Company since November
1989, as Chief Executive Officer of the Company since September 1993 and as a
director of the Company since November 1989. From November 1989 to September
1993, Ms. Reeve served as Chief Operating Officer of the Company. Prior to
joining the Company, Ms. Reeve was employed by The Boston Consulting Group.
Ms. Reeve is President of the Massachusetts Software Council and also serves
as a director of PageMart Wireless, Inc., a provider of wireless messaging
services.
 
  WILLIAM G. BROWN has served as Chief Financial Officer, Vice President of
Finance and Administration and Treasurer of the Company since June 1989. Prior
to joining the Company, Mr. Brown was Manager of Financial Reporting and
Analysis for Bolt, Beranek and Newman, Inc. and was employed at Deloitte,
Haskins and Sells.
 
  MICHAEL A. PERFIT, a founder of the Company, has served as Senior Vice
President of Technology of the Company since June 1991. From June 1989 to May
1991, Mr. Perfit served as Vice President of Engineering of the Company. Prior
to joining the Company, Mr. Perfit was Vice President of Appex, Inc. and held
engineering and technical support positions at Interactive Management Systems.
 
  RICHARD H. ANTELL has served as Vice President of Software Development of
the Company since February 1996. From June 1991 to January 1996, Mr. Antell
was Vice President of Engineering of the Company. Prior to joining the
Company, Mr. Antell served as Vice President of Application Development of
Applied Expert Systems, Inc. and Project Leader of Index Systems, Inc.
 
  DOUGLAS E. BLACKWELL has served as Vice President of Service Delivery of the
Company since November 1995. From October 1994 to October 1995, Mr. Blackwell
served as Vice President of Operations of the Company. From February 1991 to
September 1994, Mr. Blackwell was employed as Vice President of Operations of
Thomson Financial Services, Inc., an on-line financial transaction and
information services firm. Prior to February 1991, Mr. Blackwell was employed
at Nolan, Norton and Co., an affiliate of KPMG/Peat Marwick.
 
  ANDREW I. FILLAT has served as a director of the Company since April 1996.
Since July 1995, Mr. Fillat has served as Senior Vice President of Advent
International Corporation, a venture capital investment firm. From April 1989
to June 1995, Mr. Fillat served as Vice President of Advent International
Corporation.
 
 
                                      43
<PAGE>
 
  TORRENCE C. HARDER, a founder of the Company, has served as a director of
the Company since June 1989. Mr. Harder has been the President and a director
of Harder Management Company, a registered investment advisory firm, since its
establishment in 1971. He has also been the President and a director of
Entrepreneurial Ventures, Inc., Entrepreneurial Inc., and Entrepreneurial
Investment Corp., venture capital investment firms, since their foundings in
1987, 1990 and 1995, respectively.
 
  DOUGLAS A. KINGSLEY has served as a director of the Company since April
1996. Since January 1996, Mr. Kingsley has been Vice President of Advent
International Corporation, a venture capital investment firm. From September
1990 to December 1995, Mr. Kingsley was an investment manager at Advent
International Corporation. Mr. Kingsley is a director of LeCroy Corporation, a
manufacturer of electronic instrumentation.
 
  D. QUINN MILLS has served as a director of the Company since June 1990.
Since 1976, Dr. Mills has served as the Albert J. Weatherhead, Jr. Professor
of Economics at the Harvard Business School.
 
  Upon the closing of this offering, the Board of Directors will be divided
into three classes. One class of directors will be elected each year at the
annual meeting of stockholders for a term of office expiring after three
years. Mr. Kingsley will serve in the class whose term expires in 1997; Mr.
Fillat and Dr. Mills will serve in the class whose term expires in 1998; and
Mr. Harder and Ms. Reeve will serve in the class whose term expires in 1999.
Each director will serve until the expiration of his or her term and
thereafter until his or her successor is duly elected and qualified.
 
  The Board of Directors has appointed a Compensation Committee, which
provides recommendations concerning salaries and incentive compensation for
employees of and consultants to the Company, and an Audit Committee, which
reviews the results and scope of the audit and other services provided by the
Company's independent auditors.
 
  Directors of the Company serve without compensation. Under the Company's
1996 Incentive and Non-Qualified Stock Option Plan, non-employee directors of
the Company will be eligible to receive automatic formula grants of
nonqualified options. See "--Stock Option Plans."
 
  Executive officers of the Company are elected annually by the Board of
Directors and serve at its discretion or until their successors are duly
elected and qualified.
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
  The Company's Board of Directors has established a Compensation Committee,
which currently consists of Messrs. Fillat and Harder. Decisions as to
executive compensation are made by the Board of Directors, primarily upon the
recommendation of the Compensation Committee. During the year ended September
30, 1995, none of the executive officers of the Company served on the board of
directors or the compensation committee of any other entity. There are no
family relationships among executive officers or directors of the Company.
Messrs. Harder, Mills and Perfit have been parties to certain transactions
with the Company. See "Certain Transactions."
 
                                      44
<PAGE>
 
EXECUTIVE COMPENSATION
 
  The following table sets forth certain information concerning the
compensation earned by the Company's current chief executive officer and the
other four most highly paid executive officers of the Company (collectively,
the "Named Executive Officers") for services rendered in all capacities to the
Company for the year ended September 30, 1995:
 
                          SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                         LONG-TERM
                                                        COMPENSATION
                                                        ------------
                                 ANNUAL COMPENSATION       AWARDS
                                 ---------------------  ------------
                                                         SECURITIES
                                                         UNDERLYING     ALL OTHER
NAME AND PRINCIPAL POSITIONS(S)  SALARY($)   BONUS($)    OPTIONS(#)  COMPENSATION(1)
- -------------------------------  ----------  ---------  ------------ ---------------
<S>                              <C>         <C>        <C>          <C>
Pamela D.A. Reeve,.........        $165,000    $55,700        --         $1,696
 President and Chief
 Executive Officer
Richard H. Antell,.........          99,000     37,000        --            --
 Vice President of Software
 Development
William G. Brown,..........          90,000     36,400        --            891
 Chief Financial Officer,
 Vice President of Finance
 and Administration and
 Treasurer
Douglas E. Blackwell,......         102,000     15,000     40,000           --
 Vice President of Service
 Delivery
Michael A. Perfit,.........          92,700     18,300        --            695
 Senior Vice President of
 Technology
</TABLE>
- --------
(1) Represents matching contributions made by the Company to the Lightbridge,
    Inc. 401(k) savings plan.
 
BENEFIT PLANS
 
 Option Grants Table
 
  The following table sets forth certain information with respect to the grant
of a stock option by the Company to the only Named Executive Officer to whom
stock options were granted during fiscal 1995:
 
                       OPTION GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                                                         POTENTIAL
                                                                                     REALIZABLE VALUE
                                                                                        AT ASSUMED
                                                                                      ANNUAL RATES OF
                                                                                        STOCK PRICE
                                                                                     APPRECIATION FOR
                                              INDIVIDUAL GRANTS                       OPTION TERM(4)
                         ----------------------------------------------------------- -----------------
                             NUMBER OF      PERCENT OF TOTAL
                             SECURITIES     OPTIONS GRANTED    EXERCISE
                         UNDERLYING OPTIONS TO EMPLOYEES IN     PRICE     EXPIRATION
   NAME                    GRANTED(#)(1)     FISCAL YEAR(2)  ($/SHARE)(3)    DATE     5%($)    10%($)
   ----                  ------------------ ---------------- ------------ ---------- -------- --------
<S>                      <C>                <C>              <C>          <C>        <C>      <C>
Douglas E. Blackwell....       40,000            12.4%           $.50      11-08-04   $12,578  $31,875
</TABLE>
- --------
(1) The option granted is an incentive stock option that becomes exercisable
    as to 20% of the shares subject thereto on the first anniversary of the
    date of grant and an additional 5% at the end of each three-month period
    thereafter.
(2) Based on an aggregate of 321,700 shares subject to options granted to
    employees during fiscal 1995.
(3) The exercise price per share equaled the fair market value of the Common
    Stock on the date of grant, as determined by the Board of Directors.
 
                                      45
<PAGE>
 
(4) Amounts represent hypothetical gains that could be achieved for the
    respective options if exercised at the end of the option term. These gains
    are based on assumed rates of stock appreciation of 5% and 10% compounded
    annually from the date the respective options were granted to their
    expiration date and are not presented to forecast possible future
    appreciation, if any, in the price of the Common Stock. The gains shown
    are net of the option exercise price, but do not include deductions for
    taxes or other expenses associated with the exercise of the options or the
    sale of the underlying shares. The actual gains, if any, on the stock
    option exercises will depend on the future performance of the Common
    Stock, the optionee's continued employment through applicable vesting
    periods and the date on which the options are exercised and the underlying
    shares are sold.
   
  On various dates from November 10, 1995 to June 14, 1996, the Company
granted options to certain Named Executive Officers as follows: Mr. Antell
received options to purchase 100,000 shares of Common Stock at $.75 per share,
20,000 shares of Common Stock at $2.00 per share and 70,000 shares of Common
Stock at $8.50 per share; Mr. Blackwell received options to purchase 30,000
shares of Common Stock at $.75 per share, 70,000 shares of Common Stock at
$2.00 per share and 20,000 shares of Common Stock at $8.50 per share; and Mr.
Brown received options to acquire 100,000 shares of Common Stock at $.75 per
share and 70,000 shares of Common Stock at $8.50 per share. Neither Ms. Reeve
nor Mr. Perfit have received any grants of options to buy shares of Common
Stock since September 30, 1995.     
 
 Option Exercises and Year-End Value Table
 
  The following table sets forth certain information with respect to the
number and value of unexercised options held by the Named Executive Officers
on September 30, 1995. None of the Named Executive Officers exercised stock
options in fiscal 1995.
 
                         FISCAL YEAR-END OPTION VALUES
 
<TABLE>
<CAPTION>
                               NUMBER OF SECURITIES      VALUE OF UNEXERCISED
                               UNDERLYING OPTIONS AT     IN-THE-MONEY OPTIONS
                                FISCAL YEAR END(#)       AT FISCAL YEAR-END(1)
                             ------------------------- -------------------------
  NAME                       EXERCISABLE/UNEXERCISABLE EXERCISABLE/UNEXERCISABLE
  ----                       ------------------------- -------------------------
<S>                          <C>                       <C>
Pamela D.A. Reeve...........      274,500/195,500        $2,710,020/$1,897,180
Richard H. Antell...........       42,500/7,500          $  421,600/$   74,400
William G. Brown............       69,500/10,500         $  691,245/$  104,055
Douglas E. Blackwell........           --/40,000         $       --/$  380,000
Michael A. Perfit...........           --/--             $       --/$      --
</TABLE>
- --------
(1) There was no public trading market for the Common Stock on September 30,
    1995. Accordingly, solely for purposes of this table, the values in these
    columns have been calculated on the basis of an assumed initial public
    offering price of $10.00 per share (rather than a determination of the
    fair market value of the Common Stock on September 30, 1995), less the
    aggregate exercise price of the options.
 
 Stock Option Plans
   
  The Company's 1990 Incentive and Nonqualified Stock Option Plan (the "1990
Plan") was adopted by the Board of Directors and approved by the stockholders
of the Company in July 1990. The Company's stockholders have since amended the
1990 Plan from time to time to increase the number of shares of Common Stock
issuable thereunder, most recently to 2,400,000. In June 1996, the Board of
Directors adopted the Company's 1996 Incentive and Non-Qualified Stock Option
Plan (the "1996 Plan"), which was approved by the Company's stockholders in
July 1996. A total of 1,000,000 shares of Common Stock are issuable under the
1996 Plan. The 1996 Plan will become effective upon the closing of this
offering, and the Company's authority to grant additional options under the
1990 Plan will then terminate. As of August 26, 1996, options to purchase an
aggregate of 1,615,800 shares of Common Stock having a weighted average
exercise price of $1.80 per share were outstanding under the 1990 Plan and
options for 777,986 shares had been exercised under the 1990 Plan.     
 
                                      46
<PAGE>
 
  The 1996 Plan is administered by a committee of the Board of Directors (the
"Committee") consisting of the non-employee directors who are members of the
Compensation Committee. All members of the Committee are intended to be
"disinterested persons" as that term is defined under rules promulgated by the
Securities and Exchange Commission (the "Commission"). The Committee selects
the individuals to whom options will be granted and determines the option
exercise price and other terms of each option, subject to the provisions of
the 1996 Plan.
 
  The 1996 Plan authorizes the grant of options to purchase Common Stock
intended to qualify as incentive stock options ("Incentive Options"), as
defined in Section 422 of the Internal Revenue Code of 1986, as amended, and
the grant of options that do not so qualify ("Non-Qualified Options"). Under
the 1996 Plan, Incentive Options may be granted to employees and officers of
the Company or a subsidiary, including members of the Board of Directors who
are also employees of the Company or a subsidiary. Non-Qualified Options may
be granted to officers or other employees of the Company or a subsidiary, to
members of the Board of Directors or the board of directors of a subsidiary,
whether or not employees of the Company or a subsidiary, and to consultants
and other individuals providing services to the Company or a subsidiary.
 
  The 1996 Stock Option Plan also provides for automatic formula grants of
Non-Qualified Options to non-employee directors of the Company ("Outside
Directors"). Each Outside Director (i) who is in office immediately after the
closing of this offering who holds no outstanding stock option granted to him
in his capacity as a director (a "Prior Option") or (ii) who is elected to the
Board after the closing of this offering will automatically be granted,
immediately after the closing of this offering or upon his or her initial
election, as the case may be, a Non-Qualified Option (an "Initial Option") to
purchase 20,000 shares of Common Stock of the Company, vesting in equal
installments on the first three anniversaries of the date of grant (provided
that the optionee then remains a director of the Company). In addition,
immediately following each annual meeting of stockholders of the Company or
special meeting in lieu thereof, there will automatically be granted to each
Outside Director reelected at or remaining in office after such meeting a
fully-vested Non-Qualified Option to purchase 4,000 shares of Common Stock
("Additional Option"), provided that no such Additional Option will be granted
to any Outside Director who at the time of the meeting holds any outstanding
Initial Option or Prior Option that is not fully vested, unless at least two
annual meetings of stockholders of the Company or special meetings in lieu
thereof have intervened between the closing of the Company's initial public
offering (or, if later, the date of the initial election of such Outside
Director) and the meeting following which such automatic grant would occur.
Each Non-Qualified Option granted to an Outside Director pursuant to this
provision of the 1996 Stock Option Plan will expire on the tenth anniversary
of the date of grant. The exercise price of each such Non-Qualified Option
will be equal to the fair market value of the Common Stock on the date the
Non-Qualified Option is granted.
 
 Stock Purchase Plan
 
  In June 1996, the Board of Directors adopted the Company's 1996 Employee
Stock Purchase Plan (the "Stock Purchase Plan"), under which up to 100,000
shares of Common Stock may be purchased by employees of the Company. The Stock
Purchase Plan, which was approved by the Company's stockholders in July 1996,
will become effective upon the closing of this offering.
 
  During each six-month offering period under the Stock Purchase Plan,
participating employees will be entitled to purchase shares through payroll
deductions. The maximum number of shares that may be purchased will be
determined on the first day of the offering period pursuant to the following
formula: (i) up to 6% (as determined by the employee) of the employee's base
pay on such date divided by 85% of the market value of one share of Common
Stock on the first day of the offering period multiplied by (ii) two. During
each offering period, the price at which the employee will be able to purchase
shares of Common Stock will be 85% (subject to change by the Committee) of the
last reported sale price of the Common Stock on the Nasdaq National Market on
the date that the offering period commences or the date the offering period
concludes, whichever is lower.
 
  The Stock Purchase Plan will be administered by the Committee. The Company
expects that all employees who meet certain minimum criteria based on hours
worked per week and length of tenure with the Company will be eligible to
participate in the Stock Purchase Plan and that no employee will be able to
purchase shares
 
                                      47
<PAGE>
 
pursuant to the Stock Purchase Plan if after such purchase such employee would
own more than a specific percentage of the total combined voting power or
value of the stock of the Company.
   
EMPLOYMENT AGREEMENT     
   
  In August 1996 the Company executed an employment agreement with Pamela D.A.
Reeve. The Company agreed to employ Ms. Reeve as President and Chief Executive
Officer of the Company at an annual salary of $165,000. The employment
agreement is terminable at will by either party, but if Ms. Reeve's employment
is terminated by the Company for any reason, other than death or disability,
within one year after a change of control of the Company or if the Company
terminates Ms. Reeve's employment at any time without cause, the Company is
required to continue to pay Ms. Reeve's salary for a period of twelve months
after such termination, offset by any amounts received by Ms. Reeve from
subsequent employment during such period.     
 
                             CERTAIN TRANSACTIONS
 
SETTLEMENT AGREEMENT AND RELATED MATTERS
 
  On February 2, 1996, Entrepreneurial Limited Partnership I, Entrepreneurial
Limited Partnership II, Entrepreneurial Limited Partnership III,
Entrepreneurial Limited Partnership IV (collectively, the "Entrepreneurial
Partnerships"), Torrence C. Harder, the Company and certain other partnerships
and corporations entered into a settlement agreement (the "Settlement
Agreement") with Brian E. Boyle relating to litigation between the Company,
the Entrepreneurial Partnerships and one corporation, on the one hand, and Mr.
Boyle, the Company's former Chief Executive Officer and Chairman of the Board,
on the other hand. In the litigation, each of the Company and Mr. Boyle
alleged, among other things, that the other had violated certain provisions of
contracts between them. On February 2, 1996, after giving effect to the
Settlement Agreement, Mr. Boyle was the beneficial owner of 2,258,132 shares
of Common Stock, the Entrepreneurial Partnerships were the record owners of an
aggregate of 3,639,524 shares of Common Stock and Mr. Harder, a director of
the Company, was the beneficial owner of 4,582,384 shares of Common Stock. Mr.
Harder serves as a general partner of certain of the Entrepreneurial
Partnerships. Mr. Harder is also president and a director and stockholder of
the other corporations that were parties to the Settlement Agreement and that
also serve as general partners of certain of the Entrepreneurial Partnerships.
In addition, D. Quinn Mills, a director of the Company, holds a limited
partnership interest in two of the Entrepreneurial Partnerships.
 
  Pursuant to the Settlement Agreement, Mr. Boyle granted to the Company
options to purchase an aggregate of 600,000 shares of Common Stock owned by
him, and granted to the Entrepreneurial Partnerships options to purchase an
aggregate of 600,000 shares of Common Stock owned by him. The exercise prices
of the options range from $1.70 to $2.20 per share. The options expire between
April 1, 1996 and February 3, 1997, and each option may be extended for an
additional 45-day period upon payment of a specified per-share amount. The
Settlement Agreement also provided for the Company and the Entrepreneurial
Partnerships to receive the right to acquire certain interests in the
Entrepreneurial Partnerships owned by Mr. Boyle. The Entrepreneurial
Partnerships, which had shared the costs of the litigation with the Company,
have agreed to cooperate with the Company in order to permit the Company to
receive as proceeds of the settlement of the litigation, to the extent
practical, shares of Common Stock, rather than interests in the
Entrepreneurial Partnerships.
   
  On April 1, 1996, the Company and the Entrepreneurial Partnerships exercised
the options granted by Mr. Boyle that were to expire on that day. Pursuant to
such options, the Company repurchased 200,000 shares of Common Stock and the
Entrepreneurial Partnerships purchased an aggregate of 200,000 shares of
Common Stock, at a price of $1.70 per share. The Company paid $113,000 of the
exercise price of its option in cash, and paid the remaining $227,000 by
delivering an 8% promissory note payable to Mr. Boyle. In connection with the
exercise of the options by the Entrepreneurial Partnerships, the Company
loaned an aggregate of $113,000 to the Entrepreneurial Partnerships at an
interest rate of 16% per annum, which loan was repaid in May 1996. In May
1996, the Company repurchased an aggregate of 200,000 shares of Common Stock
from the Entrepreneurial Partnerships at a price of $1.70 per share. At the
same time, in consideration of the agreement of the Entrepreneurial
Partnerships described above regarding the form of the proceeds to be received
by the Company     
 
                                      48
<PAGE>
 
   
from the settlement of the litigation against Mr. Boyle, the Company
reimbursed the Entrepreneurial Partnerships for a portion of the legal fees
and expenses incurred by them in connection with the litigation in an
aggregate amount of $260,000. The Company expects to repurchase an additional
200,000 shares of Common Stock from Mr. Boyle at a price of $1.95 per share on
or before September 3, 1996, pursuant to options granted by Mr. Boyle that
will expire on that day. The Company expects to pay $130,000 of the exercise
price in cash and the remaining $260,000 by delivering an 8% promissory note
payable to Mr. Boyle.     
   
  On August 26, 1996 the Company and Mr. Boyle entered into a letter agreement
pursuant to which Mr. Boyle, his wife and a corporation controlled by Mr.
Boyle agreed to offer hereby an aggregate of 778,132 shares of Common Stock
representing all of the shares of Common Stock owned by them not subject to
the options held by the Company and the Entrepreneurial Partnerships described
above. The Company has agreed to indemnify Mr. Boyle, his wife and the
corporation against certain liabilities, including liabilities under the
Securities Act, arising in connection with this offering. The letter agreement
also provides that the Company will, upon the closing of this offering,
exercise all of its remaining options to purchase Common Stock from Mr. Boyle
and repay the promissory notes issued to Mr. Boyle in connection with the
exercise of such options. See "Use of Proceeds." Pursuant to the terms of the
letter agreement, the Company also paid Mr. Boyle the sum of $75,000, issued
to a trust for the benefit of Mr. Boyle's children a three-year warrant to
purchase 100,000 shares of Common Stock at the initial public offering price
set forth on the front cover page hereof, and granted incidental ("piggyback")
registration rights with respect to such shares. See "Description of Capital
Stock--Warrants" and "Shares Eligible for Future Sale--Registration Rights."
The letter agreement also provided for the Company, Mr. Boyle, the
Entrepreneurial Partnerships and certain other parties to re-affirm and ratify
the mutual release executed by them under the terms of the Settlement
Agreement.     
 
OTHER
 
 
  On February 23, 1993, the Company entered into license and maintenance
agreements with RentGrow, Inc. ("RentGrow") pursuant to which the Company
granted to RentGrow license to use and develop the Company's Credit Decision
System software in the real estate rental, real estate broker and real estate
mortgage brokers markets in exchange for certain payments by RentGrow. The
license is exclusive for the first four years and seven months of the
agreement and nonexclusive thereafter. Mr. Harder is a director of RentGrow
and through the Entrepreneurial Partnerships and another related limited
partnership, owned, as of December 31, 1995, approximately 54% (on a fully
diluted basis) of the outstanding capital stock of RentGrow. The last payments
under the license and maintenance agreements are due in August 1996. The
Company believes that the terms of the license and maintenance agreements were
no less favorable than those available to it from unaffiliated third parties.
The Company has also provided RentGrow with certain administrative and
facilities support under a facilities service agreement dated August 1, 1992.
The facilities service agreement was of no further effect after July 1995.
Total payments under the license, maintenance and facilities service
agreements totalled $84,736, $104,278 and $59,107 in the years ended September
30, 1993, 1994 and 1995, respectively.
  In August 1994, Massachusetts Capital Resource Company, which at that time
owned an aggregate of 977,156 shares of Common Stock, and Dr. Mills, acting as
custodian for a minor child, made subordinated loans to the Company in the
amounts of $2,000,000 and $100,000, respectively, and received warrants to
purchase 500,000 shares and 25,000 shares, respectively, of Common Stock at
$2.00 per share. The subordinated loans bear interest at the rate of 8% per
annum and are payable in installments between September 1997 and June 2001.
The warrants, all of which remain outstanding on the date of this Prospectus,
expire in June 2001. See "Principal and Selling Stockholders" and "Description
of Capital Stock--Warrants."
 
 
  In August 1995, certain accredited investors made subordinated bridge loans
to the Company in the aggregate amount of $1,151,000 and received warrants to
purchase an aggregate of 287,750 shares of Common Stock at $2.00 per share.
The bridge loans carried interest at the rate of 16% per annum and were repaid
in full in April 1996. As part of such bridge loans, one of the
Entrepreneurial Partnerships loaned $50,000 to the Company and received a
warrant to purchase 12,500 shares of Common Stock. In addition, Michael A.
Perfit holds interests in two trusts and a 401(k) plan that loaned an
aggregate of $26,000 to the Company and received warrants to purchase an
aggregate of 6,500 shares of Common Stock. Mr. Perfit is the Company's Senior
Vice President of Technology.
 
                                      49
<PAGE>
 
                      PRINCIPAL AND SELLING STOCKHOLDERS
   
  The following table sets forth certain information with respect to the
beneficial ownership of the Company's Common Stock as of August 26, 1996, and
as adjusted to reflect the sale by the Company and the Selling Stockholders of
the shares of Common Stock offered by this Prospectus, by (i) each person (or
group of affiliated persons) known by the Company to own beneficially more
than five percent of the outstanding shares of Common Stock, (ii) each of the
Selling Stockholders, (iii) each of the directors of the Company, (iv) each of
the Named Executive Officers and (v) all directors and executive officers of
the Company as a group:     
 
<TABLE>   
<CAPTION>
                                 SHARES                           SHARES TO BE
                           BENEFICIALLY OWNED                  BENEFICIALLY OWNED
                          PRIOR TO OFFERING(1)     NUMBER OF    AFTER OFFERING(1)
                          ----------------------- SHARES BEING ---------------------
  NAME AND ADDRESS(2)       NUMBER      PERCENT     OFFERED      NUMBER    PERCENT
  -------------------     ------------ ---------- ------------ ----------- ---------
<S>                       <C>          <C>        <C>          <C>         <C>
Torrence C. Harder(3)...     4,582,384     39.8%        --       4,582,384    31.1%
Entrepreneurial Limited
 Partnership I
Entrepreneurial Limited
 Partnership II
Entrepreneurial Limited
 Partnership III
Entrepreneurial Limited      3,439,524     29.9         --       3,439,524    23.3
 Partnership IV(4)......
 c/o The Harder Group
 281 Winter Street
 Waltham, Massachusetts
 02154
Advent International
 Investors II Limited
 Partnership
Advent Partners Limited
 Partnership
Global Private Equity II     2,000,000     17.7         --       2,000,000    13.8
 Limited Partnership(5).
 101 Federal Street
 Boston, Massachusetts
 02110
Brian E. Boyle(6).......     1,558,132     13.7     778,132        580,000     4.0
 31 Hallett Hill Road
 Weston, Massachusetts
 02193
Massachusetts Capital        1,477,156     12.5         --       1,477,156     9.8
 Resource Company(7)....
 420 Boylston Street
 Boston, Massachusetts
 02116
Pamela D.A. Reeve(8)....       764,614      6.6         --         764,614     5.1
D. Quinn Mills(9).......       581,640      5.1         --         581,640     4.0
Michael A. Perfit(10)...       337,694      3.0         --         337,694     2.3
William G. Brown(11)....        95,000        *         --          95,000     *
Richard H. Antell(12)...        76,000        *         --          76,000     *
Douglas E.
 Blackwell(13)..........        43,000        *         --          43,000     *
Andrew I. Fillat(14)....         5,500        *         --           5,500     *
Douglas A. Kingsley(15).         5,500        *         --           5,500     *
All directors and
 executive officers as a
 group
 (9 persons)(16)........     6,491,332     53.8         --       6,491,332    42.4
</TABLE>    
- --------
   * Less than 1%
 (1) Unless otherwise noted, each person or group identified possesses sole
     voting and investment power with respect to such shares, subject to
     community property laws where applicable. Shares not outstanding but
     deemed beneficially owned by virtue of the right of a person or group to
     acquire them within 60 days of
 
                                      50
<PAGE>
 
       
    August 26, 1996 are treated as outstanding only for purposes of
    determining the amount and percent owned by such person or group. The
    number of shares of Common Stock deemed outstanding prior to this offering
    consists of (i) 6,256,120 shares of Common Stock outstanding as of August
    26, 1996 and (ii) 5,247,324 shares of Common Stock issuable upon
    conversion of the Convertible Preferred Stock. The number of shares of
    Common Stock deemed outstanding after this offering includes an additional
    3,021,868 shares of Common Stock being offered for sale by the Company in
    this offering, includes 405,065 shares of Common Stock expected to be
    issued in connection with the exercise of certain warrants to purchase
    shares of the Common Stock and excludes 200,000 shares to be repurchased
    by the Company upon the closing of the offering. See "Description of
    Capital Stock--Warrants." Assumes no exercise of the Underwriters' over-
    allotment option.     
 (2) The address of all persons who are executive officers or directors of the
     Company is in care of the Company, 281 Winter Street, Waltham,
     Massachusetts 02154.
   
 (3) Consists of 280,000 shares beneficially owned by Mr. Harder's children,
     862,860 shares owned by a trust of which Mr. Harder is the trustee and
     beneficiary and the shares described in Note 4. Mr. Harder is the general
     partner of, or the majority stockholder of the corporate general partner
     of, Entrepreneurial Limited Partnership I, Entrepreneurial Limited
     Partnership II, Entrepreneurial Limited Partnership III and
     Entrepreneurial Limited Partnership IV (together, the "Partnerships").
     Mr. Harder is a director of the Company. If the underwriters' over-
     allotment option is exercised in full, the number and percent of shares
     to be owned beneficially after the offering by Mr. Harder will be
     4,239,757 and 28.8%, respectively. See Note 4.     
   
 (4) Consists of 1,470,240 shares held by Entrepreneurial Limited Partnership
     I, 848,356 shares held by Entrepreneurial Limited Partnership II, 100,000
     shares held by Entrepreneurial Limited Partnership III and 12,500 shares
     purchasable upon exercise of a warrant held by Entrepreneurial Limited
     Partnership III, 808,428 shares held by Entrepreneurial Limited
     Partnership IV and 200,000 shares purchasable upon exercise of call
     options held by the Partnerships. The general partner of Entrepreneurial
     Limited Partnership I is Entrepreneurial Ventures, Inc., of which Mr.
     Harder is the majority stockholder, president and a director. The general
     partners of Entrepreneurial Limited Partnerhip II and Entrepreneurial
     Limited Partnership III are Mr. Harder and Entrepreneurial Ventures, Inc.
     The general partners of Entrepreneurial Limited Partnership IV are Mr.
     Harder and Entrepreneurial, Inc., of which Mr. Harder is the majority
     stockholder, president and a director. As a result of the foregoing
     relationships, Mr. Harder may be deemed to be the beneficial owner of the
     shares held by the Partnerships. If the underwriters' over-allotment
     option is exercised in full, the Partnerships will sell 342,627 shares of
     Common Stock and the number and percent of shares to be owned
     beneficially after the offering by the Partnerships will be 3,096,897 and
     21.0%, respectively.     
 (5) Consists of 1,668 shares held by Advent International Investors II
     Limited Partnership, 93,332 shares held by Advent Partners Limited
     Partnership and 1,905,000 shares held by Global Private Equity II Limited
     Partnership. Advent International Corporation is the general partner of
     Advent International Investors II Limited Partnership, Advent Partners
     Limited Partnership and Advent International Limited Partnership, which
     the general partner of Global Private Equity II Limited Partnership.
     Because Advent International Corporation is controlled by a group of 4
     persons, none of whom may act independently and a majority of whom must
     act in concert to exercise voting or intestment power over the holdings
     of such entity, individually, no individual in this group is deemed to
     share such voting or investment power.
   
 (6) Includes 50,000 shares held directly and indirectly by the spouse of Mr.
     Boyle, 280,000 shares owned by a trust for the benefit of Mr. Boyle's
     children, 100,000 shares purchasable upon exercise of a warrant held by
     such trust and 50,000 shares held by Boyle Corp, of which Mr. Boyle is
     the President. Also includes an aggregate of 400,000 shares of Common
     Stock owned by Mr. Boyle subject to call options held by the Company and
     certain of its stockholders. See Note 4, "Use of Proceeds" and "Certain
     Transactions." Shares to be Beneficially Owned After Offering gives
     effect to the repurchase by the Company of 200,000 shares pursuant to the
     exercise of such call options upon the closing of the offering. Number of
     Shares Being Offered consists of 678,132 shares being offered by Mr.
     Boyle, 50,000 shares being offered by the spouse of Mr. Boyle and 50,000
     shares being offered by Boyle Corp.     
 (7) Includes 500,000 shares currently purchasable upon exercise of a warrant.
     William J. Torpey, Jr. is the president, and Joan C. McArdle is the vice
     president, of Massachusetts Capital Resource Company, and as a result of
     these relationships Mr. Torpey and Ms. McArdle may be deemed to be the
     beneficial owners of
 
                                      51
<PAGE>
 
       
    the shares held by Massachusetts Capital Resource Company. If the
    underwriters' over-allotment option is exercised in full, Massachusetts
    Capital Resource Company will sell 167,198 shares of Common Stock and the
    number and percent of shares to be owned beneficially after the offering
    by MCRC will be 1,309,958 and 8.7%, respectively.     
   
 (8) Includes 362,000 shares subject to stock options exercisable within 60
     days of August 26, 1996. Ms. Reeve is the President and Chief Executive
     Officer and a director of the Company.     
   
 (9) Includes 120,000 shares held by the children of Dr. Mills and 25,000
     shares purchasable upon exercise of a warrant held by a child of Dr.
     Mills. Dr. Mills is a director of the Company. If the underwriters' over-
     allotment option is exercised in full, Dr. Mills will sell 60,175 shares
     of Common Stock and the number and percent of shares to be owned
     beneficially after the offering by Dr. Mills will be 521,465 and 3.6%,
     respectively.     
(10) Consists of 331,194 shares held by various trusts and a pension plan for
     the benefit of Mr. Perfit and 6,500 shares purchasable upon exercise of a
     warrant held by various trusts and a pension plan for the benefit of Mr.
     Perfit. Mr. Perfit is the Senior Vice President of Technology of the
     Company.
   
(11) Includes 45,500 shares subject to stock options exercisable within 60
     days of August 26, 1996. Mr. Brown is the Chief Financial Officer, Vice
     President of Finance and Administration and Treasurer of the Company.
            
(12) Consists of 76,000 shares subject to stock options exercisable within 60
     days of August 26, 1996. Mr. Antell is the Vice President of Software
     Development of the Company.     
   
(13) Consists of 43,000 shares subject to stock options exercisable within 60
     days of August 26, 1996. Mr. Blackwell is the Vice President of Service
     Delivery of the Company.     
(14) Consists of shares held by Advent Partners Limited Partnership. Mr.
     Fillat holds a limited partnership interest in Advent Partners Limited
     Partnership representing beneficial ownership of the shares listed in the
     table. Mr. Fillat is a director of the Company.
(15) Consists of shares held by Advent Partners Limited Partnership. Mr.
     Kingsley holds a limited partnership interest in Advent Partners Limited
     Partnership representing beneficial ownership of the shares listed in the
     table. Mr. Kingsley is a director of the Company.
(16) Represents shares described in Notes 3, 8, 9, 10, 11, 12, 13, 14, and 15.
 
                                      52
<PAGE>
 
                         DESCRIPTION OF CAPITAL STOCK
   
  The authorized capital stock of the Company consists of 20,000,000 shares of
Common Stock, $.01 par value, 630,516 shares of Series A Redeemable
Convertible Preferred Stock, $.01 par value (the "Series A Preferred Stock"),
620,000 shares of Series B Redeemable Convertible Preferred Stock, $.01 par
value (the "Series B Preferred Stock"), 225,000 shares of Series C Redeemable
Convertible Preferred Stock, $.01 par value (the "Series C Preferred Stock")
and 1,000,000 shares of Series D Preferred Stock. As of August 26, 1996 there
were outstanding 6,256,120 shares of Common Stock held by 28 holders of
record, 630,516 shares of Series A Preferred Stock held by two holders of
record, 620,000 shares of Series B Preferred Stock held by 11 holders of
record, 200,789 shares of Series C Preferred Stock held by 14 holders of
record and 1,000,000 shares of Series D Preferred Stock held by 3 holders of
record. Effective upon the closing of this offering, the outstanding shares of
Series A Preferred Stock will convert into 1,261,032 shares of Common Stock,
the outstanding shares of Series B Preferred Stock will convert into 1,504,412
shares of Common Stock, the outstanding shares of Series C Preferred Stock
will convert into 481,880 shares of Common Stock and the outstanding shares of
Series D Preferred Stock will convert into 2,000,000 shares of Common Stock.
       
  Based on securities outstanding as of August 26, 1996, it is currently
expected that, immediately after the closing of this offering, 14,530,377
shares of Common Stock will be outstanding, together with options to acquire
1,615,800 additional shares and warrants to purchase 850,250 additional
shares. The Restated Charter, which will eliminate references to the
Convertible Preferred Stock, will be filed immediately after the closing of
this offering, and the Restated By-Laws will become effective upon the closing
of this offering. Upon the effectiveness of the Restated Charter, the
authorized capital stock of the Company will consist of 60,000,000 shares of
Common Stock, $.01 par value per share, and 5,000,000 shares of Preferred
Stock, $.01 par value per share. The description set forth below gives effect
to the filing of the Restated Charter and the adoption of the Restated By-
Laws.     
 
COMMON STOCK
 
  Holders of Common Stock are entitled to one vote per share for each share
held of record on all matters submitted to a vote of stockholders. Holders of
the Common Stock do not have cumulative voting rights, and therefore the
holders of a majority of the shares of Common Stock voting for the election of
directors may elect all of the Company's directors standing for election.
Subject to preferences that may be applicable to the holders of outstanding
shares of Preferred Stock, if any, the holders of Common Stock are entitled to
receive such lawful dividends as may be declared by the Board of Directors. In
the event of a liquidation, dissolution or winding up of the affairs of the
Company, whether voluntary or involuntary, and subject to the rights of the
holders of outstanding shares of Preferred Stock, if any, the holders of
shares of Common Stock shall be entitled to receive pro rata all of the
remaining assets of the Company available for distribution to its
stockholders. The Common Stock has no preemptive, redemption, conversion or
subscription rights. All outstanding shares of Common Stock are, and the
shares of Common Stock to be issued pursuant to this offering will be, fully
paid and non-assessable. The issuance of Common Stock or of rights to purchase
Common Stock could have the effect of making it more difficult for a third
party to acquire, or of discouraging a third party from attempting to acquire,
a majority of the outstanding voting stock of the Company.
 
PREFERRED STOCK
 
  The Board is authorized, subject to any limitations prescribed by Delaware
law, to provide for the issuance of Preferred Stock in one or more series, to
establish from time to time the number of shares to be included in each such
series, to fix the powers, designations, preferences and relative,
participating, optional or other rights, and the qualifications, limitations
or restrictions thereof, of the shares of each such series and to increase
(but not above the total number of authorized shares of Preferred Stock) or
decrease (but not below the number of shares of such series then outstanding)
the number of shares of any such series without further vote or action by the
stockholders. The Board is authorized to issue Preferred Stock with voting,
conversion and other rights and preferences that could adversely affect the
voting power or other rights of the holders of Common Stock.
 
                                      53
<PAGE>
 
Although the Company has no current plans to issue such shares, the issuance
of Preferred Stock or of rights to purchase Preferred Stock could have the
effect of making it more difficult for a third party to acquire, or of
discouraging a third party from attempting to acquire, a majority of the
outstanding voting stock of the Company.
 
WARRANTS
 
  The Company has issued warrants to purchase an aggregate of 457,288 shares
of Common Stock, subject to certain antidilution adjustments, at varying
exercise prices. Such warrants will expire by their terms on the closing of
this offering. It is currently anticipated that the holders of such warrants
will, in accordance with the terms thereof, surrender a portion of the
warrants in lieu of payment of the cash exercise price, with the warrants to
be valued at the initial public offering price of the Common Stock offered
hereby.
   
  In addition, the Company has issued warrants (the "Warrants") to purchase an
aggregate of 850,250 shares of Common Stock, subject to certain antidilution
adjustments. The Warrants to purchase 750,250 shares have an exercise price of
$2.00 per share and the Warrants to purchase 100,000 shares have an exercise
price equal to the initial public offering price. All of the Warrants are
exercisable in full. The Warrants expire on dates between September 1999 and
July 2001. The holders of the Warrants are entitled to certain registration
rights in respect of the shares of Common Stock issuable upon exercise of the
Warrants. See "Shares Eligible for Future Sale--Registration Rights."     
 
ANTI-TAKEOVER EFFECTS OF PROVISIONS OF THE RESTATED CHARTER AND BY-LAWS AND OF
DELAWARE LAW
 
 Restated Charter and By-Laws
 
  The Restated Charter and the Restated By-Laws contain certain provisions
that could discourage potential takeover attempts and make more difficult
attempts by stockholders to change the Company's management. The Restated
Charter authorizes the directors to issue, without stockholder approval,
shares of Preferred Stock in one or more series and to fix the voting powers,
preferences and rights and the qualifications, limitations and restrictions
thereof. The Restated By-Laws provide for the division of the Board of
Directors into three classes as nearly equal in size as possible with
staggered three-year terms. See "Management." The classification of the Board
of Directors could make it more difficult for a third party to acquire, or
discourage a third party from acquiring, control of the Company. The Restated
Charter provides that stockholders may act only at meetings of stockholders
and not by written consent in lieu of a stockholders' meeting. The Restated
By-Laws provide that nominations for directors may not be made by stockholders
at any annual or special meeting thereof unless the stockholder intending to
make a nomination notifies the Company of its intentions a specified number of
days in advance of the meeting and furnishes to the Company certain
information regarding itself and the intended nominee. These provisions could
delay any stockholder actions that are favored by the holders of a majority of
the outstanding stock of the Company until the next stockholders' meeting.
These provisions may also discourage another person or entity from making a
tender offer for the Company's Common Stock, because such person or entity,
even if it acquired a majority of the outstanding stock of the Company could
only take action at a duly called stockholders meeting and not by written
consent. The Restated By-Laws also provide that special meetings of the
Company's stockholders may be called only by the President or a majority of
the directors and require advance notice of business to be brought by a
stockholder before any annual or special meeting of stockholders and the
provision of certain information to the Company regarding such stockholder and
others known to be supporting such proposal and any material interest they may
have in the proposed business.
 
 Delaware Anti-Takeover Statute
 
  The Company is subject to Section 203 of the Delaware General Corporation
Law which, subject to certain exceptions, prohibits a Delaware corporation
from engaging in any business combination with any interested stockholder for
a period of three years following the date that such stockholder became an
interested stockholder, unless (i) prior to such date, the board of directors
of the corporation approved either the business combination or the transaction
which resulted in the stockholder becoming an interested stockholder; (ii)
upon consummation of the transaction which resulted in the stockholder
becoming an interested stockholder, the interested stockholder owned at least
85% of the voting stock of the corporation outstanding at the time the
transaction
 
                                      54
<PAGE>
 
commenced, excluding for purposes of determining the number of shares
outstanding those shares owned (x) by persons who are directors and also
officers and (y) by employee stock plans in which employee participants do not
have the right to determine confidentially whether shares held subject to the
plan will be tendered in a tender or exchange offer; or (iii) on or subsequent
to such date, the business combination is approved by the board of directors
and authorized at an annual or special meeting of stockholders, and not by
written consent, by the affirmative vote of at least two-thirds of the
outstanding voting stock which is not owned by the interested stockholder.
 
  Section 203 defines "business combination" to include (i) any merger or
consolidation involving the corporation and the interested stockholder; (ii)
any sale, transfer, pledge or other disposition involving the interested
stockholder of 10% or more of the assets of the corporation; (iii) subject to
certain exceptions, any transaction which results in the issuance or transfer
by the corporation of any stock of the corporation to the interested
stockholder; (iv) any transaction involving the corporation which has the
effect of increasing the proportionate share of the stock of any class or
series of the corporation beneficially owned by the interested stockholder; or
(v) the receipt by the interested stockholder of the benefit of any loans,
advances, guarantees, pledges or other financial benefits provided by or
through the corporation. In general, Section 203 defines an "interested
stockholder" as any entity or person beneficially owning 15% or more of the
outstanding voting stock of the corporation and any entity or person
associated with, affiliated with or controlling or controlled by such entity
or person.
 
LIMITATION OF LIABILITY
 
  The Restated Charter provides that no director of the Company shall be
personally liable to the Company or to any stockholder for monetary damages
arising out of such director's breach of fiduciary duty, except to the extent
that the elimination or limitation of liability is not permitted by the
Delaware General Corporation Law. The Delaware General Corporation Law, as
currently in effect, permits charter provisions eliminating the liability of
directors for breach of fiduciary duty, except that directors remain liable
for (i) any breach of the director's duty of loyalty to a company or its
stockholders, (ii) any acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of law, (iii) any payment of a
dividend or approval of a stock purchase that is illegal under Section 174 of
the Delaware General Corporation Law or (iv) any transaction from which the
director derived an improper personal benefit. A principal effect of this
provision of the Restated Charter is to limit or eliminate the potential
liability of the Company's directors for monetary damages arising from
breaches of their duty of care, unless the breach involves one of the four
exceptions described in (i) through (iv) above. The provision does not prevent
stockholders from obtaining injunctive or other equitable relief against
directors, nor does it shield directors from liability under federal or state
securities laws.
 
  The Restated Charter and the Restated By-Laws further provide for the
indemnification of the Company's directors and officer to the fullest extent
permitted by Section 145 of the Delaware General Corporation Law, including
circumstances in which indemnification is otherwise discretionary.
 
STOCK TRANSFER AGENT AND REGISTRAR
 
  The transfer agent and registrar for the Common Stock is American Stock
Transfer & Trust Company.
 
                                      55
<PAGE>
 
                        SHARES ELIGIBLE FOR FUTURE SALE
   
  Upon completion of this offering, the Company will have 14,530,377 shares of
Common Stock outstanding (including 5,247,324 shares of Common Stock issuable
upon conversion of all outstanding shares of Preferred Stock and assuming no
exercise of options or warrants outstanding as of the date of this Prospectus,
other than a warrant to be automatically exercised for 405,065 shares). Of
these shares, the 3,800,000 shares to be sold in this offering will be freely
tradable in the public market without restriction under the Securities Act,
unless they are purchased by an "affiliate" of the Company, as that term is
defined in Rule 144 promulgated under the Securities Act.     
 
SALES OF RESTRICTED SHARES
   
  The remaining 10,730,377 shares are "restricted securities" as defined by
Rules 144 or 701 (the "Restricted Shares"). Restricted securities may be sold
in the public market only if they are registered under the Securities Act or
if they qualify for an exemption from registration under Rules 144, 144(k) or
701 under the Securities Act. All 10,730,377 Restricted Shares are subject to
the lock-up agreements described below. Upon the expiration of the lock-up
agreements, 8,667,877 of the 10,730,377 shares may be sold pursuant to Rules
144 or 701, subject in some cases to certain volume restrictions imposed
thereby. Subject to Rules 144, 144(k) and 701 and to the lock-up agreements,
additional shares will be available for sale in the public market as follows:
(i) 8,572,487 shares will be eligible for resale in the public market
immediately following the completion of this offering, subject in some cases
to certain volume restrictions and other conditions pursuant to Rules 144 and
144(k); (ii) 95,390 shares will become eligible for sale during the 90 days
following the date of this Prospectus pursuant to Rules 144 and 701; and (iii)
2,062,500 shares will be eligible for sale upon expiration of their respective
two-year holding periods, subject to the restrictions and conditions of Rule
144, such holding periods to expire on April 3, 1998 for 2,000,000 shares and
on June 30, 1998 for 62,500 shares.     
   
  In general, under Rule 144 as currently in effect, any person (or persons
whose shares are aggregated), who has beneficially owned restricted securities
for at least two years is entitled to sell, within any three-month period, a
number of such securities that does not exceed the greater of 1% of the then
outstanding shares of the Common Stock (approximately 145,300 shares, based on
the number of shares to be outstanding after this offering) or the average
weekly trading volume in the public market during the four calendar weeks
preceding the filing of the seller's Form 144, provided certain requirements
concerning availability of public information concerning the Company, manner
of sale and notice of sale are satisfied. A person who is not an affiliate,
has not been an affiliate within three months prior to the sale and has
beneficially owned the restricted securities for at least three years is
entitled to sell such shares under Rule 144(k) without regard to any of the
limitations described above. Rule 144 also provides that affiliates who are
selling shares that are not restricted securities must nonetheless comply with
the same restrictions applicable to restricted securities with the exception
of the holding period requirement. The two- and three-year holding periods
described above do not begin to run until the full purchase price or other
consideration is paid by the person acquiring the restricted securities from
the issuer or an affiliate of the issuer and may include the holding period of
a prior owner who is not an affiliate of the issuer. The Commission has
proposed certain amendments to Rule 144 that would reduce by one year the
holding periods required for shares subject to Rule 144 to become eligible for
resale in the public market. This proposal, if adopted, would increase the
number of shares of Common Stock eligible for immediate resale following
expiration of the lock-up agreements described below. No assurance can be
given concerning whether or when the proposal will be adopted by the
Commission.     
   
  Securities issued in reliance on Rule 701 (such as shares of Common Stock
issued before the closing of this offering upon the exercise of options
granted under the 1990 Plan) are also Restricted Shares and, beginning
approximately 90 days after the date of this Prospectus, may be resold by
persons other than affiliates of the Company subject only to the manner of
sale provisions of Rule 144 and may be resold by affiliates under Rule 144
without compliance with its two-year holding period requirement. Outstanding
options to purchase 615,020 shares of Common Stock were fully vested as of
August 26, 1996, all of which are subject to 180-day lock-up agreements.     
 
                                      56
<PAGE>
 
   
  The Company intends to file one or more registration statements on Form S-8
under the Securities Act to register all shares of Common Stock issued or
issuable under the 1990 Plan, the 1996 Plan and the Stock Purchase Plan. See
"Management--Benefit Plans." The registration statements are expected to be
filed as soon as practicable after the date of this Prospectus and will become
effective immediately upon filing. Shares covered by the registration
statements will be eligible for resale in the public market after the
effective date of the registration statements, subject to the lock-up
agreements described below, if applicable.     
 
  As of the consummation of this offering and after giving effect to the sale
of the shares of Common Stock offered by the Selling Stockholders hereby,
holders of 6,613,131 shares of Common Stock will have rights to require the
Company in certain circumstances to register such shares for sale under the
Securities Act. See "--Registration Rights."
 
  Prior to this offering there has been no public market for the Common Stock
of the Company and no prediction can be made as to the effect, if any, that
market sales or the availability for sale of such shares will have on the
market price of the Common Stock prevailing from time to time. Nevertheless,
sales of substantial numbers of shares in the public market could adversely
affect the market price of the Common Stock and could impair the Company's
ability to raise capital through a sale of its equity securities. See "Risk
Factors--Absence of Public Market; Possible Volatility of Stock Price."
 
LOCK-UP AGREEMENTS
   
  The executive officers and directors of the Company, the Selling
Stockholders and certain others, who, upon the closing of this offering, will
beneficially own an aggregate of 10,730,377 shares of Common Stock, options to
purchase 1,615,800 shares of Common Stock and warrants to purchase 850,250
shares of Common Stock, have agreed that they will not, without the prior
written consent of Cowen & Company, sell, offer, contract to sell or otherwise
dispose of any shares of Common Stock or any securities convertible into or
exchangeable for any shares of Common Stock for a period of 180 days after the
date of this Prospectus.     
 
REGISTRATION RIGHTS
 
  Pursuant to a Registration Rights Agreement dated February 11, 1991, as
amended, the Company has granted registration rights to certain of its
stockholders with respect to certain shares ("Registrable Shares") consisting
of (i) 5,247,324 shares of Common Stock issuable upon conversion of the
Convertible Preferred Stock, (ii) 525,000 shares of Common Stock issuable upon
exercise of two outstanding warrants and (iii) 910,615 shares of Common Stock
initially held by two specified stockholders.
 
  Holders may request registration of Registrable Shares under the Securities
Act as follows. First, holders of 25% of the Registrable Shares then
outstanding may, at any time, require the Company to use its best efforts to
register all or any portion of their Registrable Shares if the shares to be
registered (a) represent all of the Registrable Shares then held by such
holders, (b) represent at least 20% of the Registrable Shares originally
issued if such holders request the registration of less than all of the
Registrable Shares held by them or (c) are reasonably anticipated to be
offered at an aggregate price to the public that exceeds $2,000,000. Second,
at any time when the Company qualifies to register securities on Form S-3
under the Securities Act, holders of Registrable Shares may request the
Company file a registration statement on Form S-3 for a public offering of all
or any portion of the Registrable Shares, provided that the reasonably
anticipated aggregate price to the public is at least $500,000. Third, each
holder of Registrable Shares has incidental ("piggyback") registration rights
with respect to registrations of the Company's securities, pursuant to which
the holder may request that all or any portion of its Registrable Shares be
included in a registration statement (other than a registration statement of
Form S-4 or S-8 or certain other forms) being filed by the Company for its own
account or otherwise. The Company will pay certain expenses incurred by the
holders of Registrable Shares in exercising the foregoing registration rights.
   
  Pursuant to a Registration Rights Agreement dated August 26, 1996, the
Company has granted incidental registration rights with respect to 100,000
shares of Common Stock issuable upon exercise of an outstanding warrant. The
holder of such shares may request that all or a portion of such shares be
included in a registration statement (other than a registration statement on
Form S-4 or S-8 or certain other forms) being filed by the Company for its own
account or otherwise. The Company will pay certain expenses incurred by such
holder in exercising the foregoing registration rights.     
 
                                      57
<PAGE>
 
                                 UNDERWRITING
 
  Subject to the terms and conditions of the Underwriting Agreement, the
Company and the Selling Stockholders have agreed to sell to each of the
Underwriters named below, and each of the Underwriters, for whom Cowen &
Company, Montgomery Securities and Prudential Securities Incorporated are
acting as Representatives (the "Representatives"), has severally agreed to
purchase from the Company and the Selling Stockholders, the respective number
of shares of Common Stock set forth opposite its name below:
 
<TABLE>   
<CAPTION>
                                                                     NUMBER OF
                                                                     SHARES OF
UNDERWRITER                                                         COMMON STOCK
- -----------                                                         ------------
<S>                                                                 <C>
Cowen & Company....................................................
Montgomery Securities..............................................
Prudential Securities Incorporated.................................
                                                                     ---------
    Total..........................................................  3,800,000
                                                                     =========
</TABLE>    
 
  The Underwriting Agreement provides that the obligations of the Underwriters
are subject to certain conditions precedent, including the absence of any
material adverse change in the Company's business and the receipt of certain
closing certificates, opinions and letters from the Company and its counsel
and independent auditors. The nature of the Underwriters' obligations is such
that they are committed to purchase all of the shares of Common Stock being
offered hereby (other than those covered by the over-allotment option
described below) if any of such shares are purchased.
 
  The Underwriters propose to offer the shares of Common Stock in part
directly to the public at the initial public offering price set forth on the
cover page of this Prospectus and in part to certain dealers at such price
less a concession not in excess of $   per share. The Underwriters may allow,
and such dealers may re-allow, a concession not in excess of $   per share to
certain brokers and dealers. After the shares of Common Stock are released for
sale to the public, the offering price and other selling terms may from time
to time be varied by the Representatives.
   
  Certain of the Selling Stockholders have granted the Underwriters an option
exercisable for up to 30 days after the date of this Prospectus to purchase up
to an aggregate of 570,000 additional shares of Common Stock to cover over-
allotments, if any. If the Underwriters exercise their over-allotment option,
the Underwriters have severally agreed, subject to certain conditions, to
purchase approximately the same percentage thereof that the number of shares
to be purchased by each of them as shown in the foregoing table bears to the
3,800,000 shares of Common Stock offered hereby. The Underwriters may exercise
such option only to cover over-allotments made in connection with the sale of
the Common Stock offered hereby.     
   
  The Company and the Selling Stockholders have agreed to indemnify the
several Underwriters against certain liabilities, including liabilities under
the Securities Act and to contribute to payments the Underwriters may be
required to make in respect thereof. In addition, in a separate agreement, the
Company has agreed to indemnify certain of the Selling Stockholders against
certain liabilities, including liabilities under the Securities     
 
                                      58
<PAGE>
 
   
Act, and to contribute to payments such Selling Stockholders may be required
to make in respect thereof. See "Certain Transactions--Settlement Agreement
and Related Matters."     
 
  The Company, the Company's executive officers and directors, all Selling
Stockholders and certain other stockholders and option holders of the Company
have agreed that they will not, without the prior written consent of Cowen &
Company, sell, offer, contract to sell, or otherwise dispose of any shares of
Common Stock or any securities convertible into or exchangeable for any shares
of Common Stock for a period of 180 days after the date of this Prospectus.
See "Shares Eligible for Future Sale--Lock-up Agreements."
 
  The Representatives have advised the Company and the Selling Stockholders
that the Underwriters do not intend to confirm sales of the shares offered
hereby to any account over which they exercise discretionary authority.
 
  Prior to this offering, there has been no public market for the Common
Stock. Consequently, the initial public offering price will be determined by
negotiation among the Company, the Selling Stockholders and the
Representatives. Among the factors to be considered in such negotiations are
the prevailing market conditions, the market prices of securities of publicly
traded companies engaged in activities similar to those of the Company, the
Company's financial and operating history and condition, estimates of the
business potential of the Company, the present state of the Company's
development, and other factors deemed relevant. The estimated initial public
offering price range set forth on the cover hereof is subject to change as a
result of market conditions and other factors.
 
                                 LEGAL MATTERS
 
  The validity of the shares offered hereby and certain other legal matters
will be passed upon for the Company and the Selling Stockholders by Foley,
Hoag & Eliot llp, Boston, Massachusetts. Certain legal matters will be passed
upon for the Underwriters by Testa, Hurwitz & Thibeault, llp, Boston,
Massachusetts.
 
                                    EXPERTS
 
  The Financial Statements of the Company at September 30, 1994 and 1995 and
December 31, 1995, and for each of the three years in the period ended
September 30, 1995 and for the three-month period ended December 31, 1995,
appearing in this Prospectus have been audited by Deloitte & Touche llp,
independent auditors, as stated in their report appearing herein, and are
included in reliance upon the report of such firm given upon their authority
as experts in accounting and auditing.
 
                            ADDITIONAL INFORMATION
 
  The Company has filed with the Commission a Registration Statement on Form
S-1 under the Securities Act with respect to the Common Stock offered hereby.
This Prospectus does not contain all of the information set forth in the
Registration Statement and the exhibits and schedules thereto. For further
information with respect to the Company and the Common Stock, reference is
made to such Registration Statement and the exhibits and schedules filed as a
part thereof. Statements contained in this Prospectus as to the contents of
any contract or any other document referred to are not necessarily complete,
and, in each instance, if such contract or document is filed as an exhibit,
reference is made to the copy of such contract or document filed as an exhibit
to the Registration Statement, each such statement being qualified in all
respects by such reference to such exhibit. The Registration Statement,
including exhibits and schedules thereto, may be inspected and copied at the
public reference facilities maintained by the Commission at Room 1024,
Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549 and at the
Regional Offices of the Commission at Suite 1400, 500 West Madison Street,
Chicago, Illinois 60661 and 7 World Trade Center, Thirteenth Floor, New York,
New York 10048. Copies also may be obtained from the Public Reference Section
of the Commission at Room 1024, Judiciary Plaza, 450 Fifth Street, N.W.,
Washington D.C. 20549, at prescribed rates.
 
                                      59
<PAGE>
 
                               LIGHTBRIDGE, INC.
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
Independent Auditors' Report.............................................. F-2
Balance Sheets as of September 30, 1994 and 1995, December 31, 1995 and
 June 30, 1996 (Unaudited)................................................ F-3
Statements of Operations for the Years Ended September 30, 1993, 1994 and
 1995, the Three Months Ended December 31, 1994 (Unaudited), December 31,
 1995, and the Six Months Ended June 30, 1995 (Unaudited) and June 30,
 1996 (Unaudited)......................................................... F-4
Statements of Stockholders' Deficiency for the Years Ended September 30,
 1993, 1994 and 1995, the Three Months Ended December 31, 1995, and the
 Six Months Ended June 30, 1996 (Unaudited)............................... F-5
Statements of Cash Flows for the Years Ended September 30, 1993, 1994 and
 1995, the Three Months Ended December 31, 1994 (Unaudited), December 31,
 1995, and the Six Months Ended June 30, 1995 (Unaudited) and June 30,
 1996 (Unaudited)......................................................... F-6
Notes to Financial Statements............................................. F-7
</TABLE>
 
                                      F-1
<PAGE>
 
                         INDEPENDENT AUDITORS' REPORT
 
To the Board of Directors Lightbridge, Inc. Waltham, Massachusetts
 
  We have audited the accompanying balance sheets of Lightbridge, Inc. as of
September 30, 1994 and 1995 and December 31, 1995, and the related statements
of operations, stockholders' deficiency, and cash flows for the years ended
September 30, 1993, 1994 and 1995 and the three months ended December 31,
1995. These financial statements are the responsibility of the Company's
management. Our responsibility is to express an opinion on these financial
statements based on our audits.
 
  We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether the financial statements are free of
material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.
 
  In our opinion, such financial statements present fairly, in all material
respects, the financial position of the Company at September 30, 1994 and 1995
and December 31, 1995, and the results of its operations and its cash flows
for the years ended September 30, 1993, 1994 and 1995 and the three months
ended December 31, 1995 in conformity with generally accepted accounting
principles.
 
Deloitte & Touche LLP
 
Boston, Massachusetts
April 22, 1996 (Except for Notes 4 and 11 as to which
the dates are August 8, 1996 and July 15, 1996, respectively)
 
 
                                      F-2
<PAGE>
 
                               LIGHTBRIDGE, INC.
                                 BALANCE SHEETS
<TABLE>   
<CAPTION>
                               SEPTEMBER 30,                       JUNE 30,      PRO FORMA
                          ------------------------  DECEMBER 31,     1996      JUNE 30, 1996
                             1994         1995          1995      (UNAUDITED)   (UNAUDITED)
                          -----------  -----------  ------------  -----------  -------------
<S>                       <C>          <C>          <C>           <C>          <C>
         ASSETS
Current assets:
 Cash and cash
  equivalents...........  $ 1,831,916  $   539,025  $    58,064   $ 3,532,294
 Accounts receivable....    2,676,451    2,753,758    4,578,143     5,270,830
 Accounts receivable
  from related parties..      107,231      121,100      136,809        93,877
 Other current assets...      223,885      158,571      144,294       310,956
                          -----------  -----------  -----------   -----------
    Total current
     assets.............    4,839,483    3,572,454    4,917,310     9,207,957
Noncurrent receivable
 from related party.....       45,638          --           --            --
Fixed assets--net.......    4,101,292    5,319,832    4,881,655     4,089,622
Capitalized software
 development costs--net.          --       896,141      762,084       574,810
Deposits................      167,963      206,620      225,807       229,024
Other assets............       26,241      219,236      254,625       453,245
                          -----------  -----------  -----------   -----------
    Total assets........  $ 9,180,617  $10,214,283  $11,041,481   $14,554,658
                          ===========  ===========  ===========   ===========
    LIABILITIES AND
  STOCKHOLDERS' EQUITY
      (DEFICIENCY)
Current liabilities:
 Accounts payable and
  accrued expenses......  $ 1,305,254  $ 2,304,595  $ 3,025,038   $ 2,178,554
 Short-term borrowings
  and current portion of
  subordinated notes
  payable...............      250,000    1,976,992    1,500,000     1,500,000
 Current portion of
  obligations under
  capital leases........    1,181,581    2,066,748    2,073,895     2,017,970
 Deferred revenues......       58,333      228,650       74,800       808,781
 Dividends payable on
  preferred stock.......      166,876      166,876      166,876       166,876
 Related parties:
  Accounts payable......          784          --           --            --
  Subordinated notes
   payable..............          --        69,071          --        113,333
  Interest payable......       99,670       39,035       44,096         2,000
  Current portion of
   obligations under
   capital leases.......       61,952          --           --            --
                          -----------  -----------  -----------   -----------
    Total current
     liabilities........    3,124,450    6,851,967    6,884,705     6,787,514
Deferred revenues--
 related parties........        2,781          --           --            --
Obligations under
 capital leases.........    2,355,733    1,916,609    1,502,128       683,069
Notes payable:
 Unaffiliated parties...    1,754,018    1,789,643    2,848,837     1,807,156
 Related parties........       87,701       89,576      164,298       203,848
                          -----------  -----------  -----------   -----------
    Total liabilities...    7,324,683   10,647,795   11,399,968     9,481,587
                          -----------  -----------  -----------   -----------
Commitments and
 contingencies (Note 5)
Redeemable convertible
 preferred stock at
 redemption value
 (liquidation preference
 of $3,115,315,
 $3,297,859, $3,343,494
 and $9,393,164 at
 September 30, 1994 and
 1995 and December 31,
 1995 and June 30, 1996,
 respectively)..........    2,948,439    3,130,983    3,176,618     9,226,288   $       --
                          -----------  -----------  -----------   -----------   -----------
Stockholders' equity
 (deficiency):
 Common stock, $.01 par
  value; 20,000,000
  shares authorized;
  6,498,232, 6,500,748,
  6,575,098 and
  6,657,268 shares
  issued; 6,657,268,
  6,499,600, 6,573,950
  and 6,256,120 shares
  outstanding at
  September 30, 1994 and
  1995, December 31,
  1995 and June 30,
  1996, respectively....       64,982       65,007       65,751        66,573       123,096
 Additional paid-in
  capital...............      100,003          --           --         75,316     9,245,081
 Warrants...............      262,500      406,375      406,375       375,125       375,125
 Note receivable,
  stockholder...........      (13,085)     (13,085)     (13,085)      (13,085)      (13,085)
 Accumulated deficit....   (1,506,905)  (4,022,218)  (3,993,572)   (3,951,072)   (4,026,072)
                          -----------  -----------  -----------   -----------   -----------
    Total...............   (1,092,505)  (3,563,921)  (3,534,531)   (3,447,143)    5,704,145
 Less treasury stock, at
  cost..................          --          (574)        (574)     (706,074)   (1,536,074)
                          -----------  -----------  -----------   -----------   -----------
    Total stockholders'
     equity
     (deficiency).......   (1,092,505)  (3,564,495)  (3,535,105)   (4,153,217)  $ 4,168,071
                          -----------  -----------  -----------   -----------   -----------
    Total liabilities
     and stockholders'
     equity
     (deficiency).......  $ 9,180,617  $10,214,283  $11,041,481   $14,554,658
                          ===========  ===========  ===========   ===========
</TABLE>    
 
                       See notes to financial statements.
 
                                      F-3
<PAGE>
 
                               LIGHTBRIDGE, INC.
 
                            STATEMENTS OF OPERATIONS
 
<TABLE>   
<CAPTION>
                                                                  THREE MONTHS ENDED        SIX MONTHS ENDED
                              YEARS ENDED SEPTEMBER 30,              DECEMBER 31,               JUNE 30,
                          ------------------------------------  -----------------------  ------------------------
                             1993        1994         1995         1994         1995        1995         1996
                          ----------  -----------  -----------  -----------  ----------  -----------  -----------
                                                                (UNAUDITED)                    (UNAUDITED)
<S>                       <C>         <C>          <C>          <C>          <C>         <C>          <C>
Revenues (Includes sales
 to a related party of
 $84,736, $104,278,
 $59,017, $21,075,
 $10,644, $29,240 and
 $3,125, respectively)..  $6,985,912  $13,397,863  $19,350,467  $5,514,643   $6,512,050  $ 9,003,012  $13,263,057
Cost of revenues           3,553,577    7,415,356   12,607,879   3,015,687    3,484,175    6,231,663    7,511,529
                          ----------  -----------  -----------  ----------   ----------  -----------  -----------
Gross profit............   3,432,335    5,982,507    6,742,588   2,498,956    3,027,875    2,771,349    5,751,528
                          ----------  -----------  -----------  ----------   ----------  -----------  -----------
Operating expenses:
 Development............   1,164,469    2,317,454    3,864,000     849,705    1,144,973    1,862,712    1,970,735
 Sales and marketing....     829,004      814,891    1,901,716     433,509      794,687      937,869    1,916,694
 General and
  administrative........   1,309,049    1,643,496    2,583,912     629,841      700,640    1,301,226    1,172,095
                          ----------  -----------  -----------  ----------   ----------  -----------  -----------
   Total operating
    expenses............   3,302,522    4,775,841    8,349,628   1,913,055    2,640,300    4,101,807    5,059,524
                          ----------  -----------  -----------  ----------   ----------  -----------  -----------
Income (loss) from
 operations.............     129,813    1,206,666   (1,607,040)    585,901      387,575   (1,330,458)     692,004
Other income (expense):
 Interest income:
 Related parties........      11,788       12,604        8,688       2,633        1,551        4,937        3,182
 Other..................       4,328        9,384       29,006       9,120          510       10,362       41,071
 Interest expense:
 Related parties........    (125,600)     (20,753)      (3,908)    (53,201)     (60,586)    (102,750)    (166,172)
 Other..................    (124,704)    (224,927)    (859,660)   (131,800)    (246,525)    (317,933)    (249,371)
 Other nonoperating
  expense...............     (21,048)      (9,802)         --         (930)      (7,920)         --         1,286
                          ----------  -----------  -----------  ----------   ----------  -----------  -----------
Income (loss) before
 provision for income
 taxes..................    (125,423)     973,172   (2,432,914)    411,723       74,605   (1,735,842)     322,000
Provision for income
 taxes..................         --        22,900          --          --         2,400          --        19,500
                          ----------  -----------  -----------  ----------   ----------  -----------  -----------
Net income (loss).......  $ (125,423) $   950,272  $(2,432,914) $  411,723   $   72,205  $(1,735,842) $   302,500
                          ==========  ===========  ===========  ==========   ==========  ===========  ===========
Pro forma net income
 (loss) per common
 share..................                           $     (0.19)              $     0.01               $      0.02
                                                   ===========               ==========               ===========
Pro forma weighted
 average number of
 common and common
 equivalent shares
 outstanding............                            12,614,495               13,114,599                13,746,830
                                                   ===========               ==========               ===========
</TABLE>    
 
                       See notes to financial statements.
 
                                      F-4
<PAGE>
 
                               LIGHTBRIDGE, INC.
 
                     STATEMENTS OF STOCKHOLDERS' DEFICIENCY
 
<TABLE>
<CAPTION>
                           COMMON STOCK     TREASURY STOCK    ADDITIONAL               NOTE                      TOTAL
                         ----------------- -----------------   PAID-IN              RECEIVABLE, ACCUMULATED  STOCKHOLDERS'
                          SHARES   AMOUNT  SHARES   AMOUNT     CAPITAL    WARRANTS  STOCKHOLDER   DEFICIT     DEFICIENCY
                         --------- ------- ------- ---------  ----------  --------  ----------- -----------  -------------
<S>                      <C>       <C>     <C>     <C>        <C>         <C>       <C>         <C>          <C>
Balance, October 1,
 1992..................  5,274,938 $52,749     --  $     --   $     --    $    --    $(13,085)  $(2,331,754)  $(2,292,090)
Issuance of common
 stock for:
 Cash..................    619,416   6,194     --        --      19,286        --         --            --         25,480
 Convertible notes and
  interest payable.....    517,778   5,178     --        --     405,419        --         --            --        410,597
Dividends on redeemable
 convertible preferred
 stock.................        --      --      --        --    (150,421)       --         --            --       (150,421)
Net loss...............        --      --      --        --         --         --         --       (125,423)     (125,423)
                         --------- ------- ------- ---------  ---------   --------   --------   -----------   -----------
Balance, September 30,
 1993..................  6,412,132  64,121     --        --     274,284        --     (13,085)   (2,457,177)   (2,131,857)
Issuance of common
 stock for cash........     86,100     861     --        --       8,263        --         --            --          9,124
Issuance of stock
 purchase warrants.....        --      --      --        --         --     262,500        --            --        262,500
Dividends on redeemable
 convertible preferred
 stock.................        --      --      --        --    (182,544)       --         --            --       (182,544)
Net income.............        --      --      --        --         --         --         --        950,272       950,272
                         --------- ------- ------- ---------  ---------   --------   --------   -----------   -----------
Balance, September 30,
 1994..................  6,498,232  64,982     --        --     100,003    262,500    (13,085)   (1,506,905)   (1,092,505)
Issuance of common
 stock for cash........      2,516      25     --        --         142        --         --            --            167
Issuance of stock
 purchase warrants.....        --      --      --        --         --     143,875        --            --        143,875
Dividends on redeemable
 convertible preferred
 stock.................        --      --      --        --    (100,145)       --         --        (82,399)     (182,544)
Repurchase of common
 stock for cash........        --      --    1,148      (574)       --         --         --            --           (574)
Net loss...............        --      --      --        --         --         --         --     (2,432,914)   (2,432,914)
                         --------- ------- ------- ---------  ---------   --------   --------   -----------   -----------
Balance, September 30,
 1995..................  6,500,748  65,007   1,148      (574)       --     406,375    (13,085)   (4,022,218)   (3,564,495)
Issuance of common
 stock for cash........     74,350     744     --        --       2,076        --         --            --          2,820
Dividends on redeemable
 convertible preferred
 stock.................        --      --      --        --      (2,076)       --         --        (43,559)      (45,635)
Net income.............        --      --      --        --         --         --         --         72,205        72,205
                         --------- ------- ------- ---------  ---------   --------   --------   -----------   -----------
Balance, December 31,
 1995..................  6,575,098  65,751   1,148      (574)       --     406,375    (13,085)   (3,993,572)   (3,535,105)
Unaudited:
 Issuance of common
  stock for cash.......     82,170     822     --        --     135,336        --         --            --        136,158
 Exercise of common
  stock warrant........        --      --      --        --      31,250    (31,250)       --            --            --
 Repurchase of common
  stock for cash.......        --      --  400,000  (705,500)       --         --         --            --       (705,500)
 Dividends on
  redeemable
  convertible preferred
  stock................        --      --      --        --     (91,270)       --         --            --        (91,270)
 Expenses paid on
  behalf of
  stockholder..........        --      --      --        --         --         --         --       (260,000)     (260,000)
 Net income............        --      --      --        --         --         --         --        302,500       302,500
                         --------- ------- ------- ---------  ---------   --------   --------   -----------   -----------
Balance, June 30, 1996
 (unaudited)...........  6,657,268 $66,573 401,148 $(706,074) $  75,316   $375,125   $(13,085)  $(3,951,072)  $(4,153,217)
                         ========= ======= ======= =========  =========   ========   ========   ===========   ===========
</TABLE>
 
                       See notes to financial statements.
 
                                      F-5
<PAGE>
 
                               LIGHTBRIDGE, INC.
 
                            STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                                   THREE MONTHS               SIX MONTHS
                                    YEARS ENDED                        ENDED                    ENDED
                                   SEPTEMBER 30,                   DECEMBER 31,                JUNE 30,
                         -----------------------------------  ------------------------  -----------------------
                           1993        1994         1995         1994         1995         1995         1996
                         ---------  -----------  -----------  -----------  -----------  -----------  ----------
                                                              (UNAUDITED)                    (UNAUDITED)
<S>                      <C>        <C>          <C>          <C>          <C>          <C>          <C>
Cash flows from
 operating activities:
 Net income (loss)...... $(125,423) $   950,272  $(2,432,914) $   411,723  $    72,205  $(1,735,842) $  302,500
 Adjustments to
  reconcile net income
  (loss) to net cash
  provided by (used in)
  operating activities:
 Depreciation and
  amortization..........   868,965    1,000,057    2,567,767      555,966      864,192    1,447,268   1,665,679
 Amortization of
  discount on notes.....       --         4,219       76,500        9,375       87,853       18,750      35,534
 Changes in assets and
  liabilities:
  Accounts receivable...  (847,786)  (1,278,988)     (77,307)  (1,474,071)  (1,840,094)   1,556,256    (649,755)
  Other assets..........   (54,475)    (269,299)    (173,594)    (227,752)     (30,014)     (59,240)   (388,860)
  Accounts payable and
   accrued liabilities..   274,697      341,878      935,172      610,339      725,504      (40,187)   (888,580)
  Deferred revenues.....   297,752     (254,721)     167,536      655,094     (153,850)    (246,567)    733,981
                         ---------  -----------  -----------  -----------  -----------  -----------  ----------
    Net cash provided by
     (used in) operating
     activities.........   413,730      493,418    1,063,160      540,674     (274,204)     940,438     810,499
                         ---------  -----------  -----------  -----------  -----------  -----------  ----------
Cash flows used in
 investing activities:
 Purchases of fixed
  assets................  (309,868)    (339,223)  (1,391,679)    (359,874)    (184,186)    (960,360)   (463,646)
 Capitalization of
  software costs........       --           --      (980,453)    (310,652)         --      (523,983)        --
                         ---------  -----------  -----------  -----------  -----------  -----------  ----------
    Net cash used in
     investing
     activities.........  (309,868)    (339,223)  (2,372,132)    (670,526)    (184,186)  (1,484,343)   (463,646)
                         ---------  -----------  -----------  -----------  -----------  -----------  ----------
Cash flows from
 financing activities:
 Proceeds from notes
  payable and warrants..   210,000    2,350,000    1,901,000          --       500,000      750,000         --
 Payments on notes
  payable...............  (501,000)     (50,000)         --           --           --           --   (1,151,000)
 Payments under capital
  lease obligations.....  (412,988)    (823,085)  (1,884,512)    (410,045)    (525,391)    (965,366) (1,077,348)
 Proceeds from issuance
  of common stock.......    25,480        9,124          167          --         2,820          167     136,158
 Payments toward the
  purchase of treasury
  stock.................       --           --          (574)         --           --          (574)   (478,833)
 Expenses paid on behalf
  of stockholder........       --           --           --           --           --           --     (260,000)
 Proceeds from issuance
  of mandatory
  redeemable convertible
  preferred stock, net..   584,228          --           --           --           --           --    5,958,400
                         ---------  -----------  -----------  -----------  -----------  -----------  ----------
    Net cash provided by
     (used in) financing
     activities.........   (94,280)   1,486,039       16,081     (410,045)     (22,571)    (215,773)  3,127,377
                         ---------  -----------  -----------  -----------  -----------  -----------  ----------
Net increase (decrease)
 in cash and cash
 equivalents............     9,582    1,640,234   (1,292,891)    (539,897)    (480,961)    (759,678)  3,474,230
Cash and cash
 equivalents, beginning
 of period..............   182,100      191,682    1,831,916    1,831,916      539,025    1,292,019      58,064
                         ---------  -----------  -----------  -----------  -----------  -----------  ----------
Cash and cash
 equivalents, end of
 period................. $ 191,682  $ 1,831,916  $   539,025  $ 1,292,019  $    58,064  $   532,341  $3,532,294
                         =========  ===========  ===========  ===========  ===========  ===========  ==========
Cash paid for interest.. $ 152,292  $   283,272  $   904,605  $   251,372  $   176,271  $   418,730  $  495,875
                         =========  ===========  ===========  ===========  ===========  ===========  ==========
Cash paid for income
 taxes.................. $     --   $     5,300  $    25,000  $    25,000  $    15,700  $     9,650  $   31,100
                         =========  ===========  ===========  ===========  ===========  ===========  ==========
</TABLE>
 
                       See notes to financial statements.
 
                                      F-6
<PAGE>
 
                               LIGHTBRIDGE, INC.
 
                         NOTES TO FINANCIAL STATEMENTS
(INFORMATION WITH RESPECT TO THE THREE MONTHS ENDED DECEMBER 31, 1994, AND THE
            SIX MONTHS ENDED JUNE 30, 1995 AND 1996 IS UNAUDITED.)
 
1. BUSINESS AND TECHNOLOGY ACQUISITIONS
 
  Business--Lightbridge, Inc. (formerly Credit Technologies, Inc.) (the
"Company") was incorporated in June 1989 under the laws of the state of
Delaware. The Company develops and markets customer acquisition solutions for
the wireless communications industry. Effective November 1, 1994, the Company
changed its name and reincorporated as Lightbridge, Inc. During 1995, the
Board of Directors passed a resolution to change the fiscal year end to
December 31.
 
  Technology Acquisitions--During the year ended September 30, 1995, the
Company completed the following technology acquisitions:
 
  . In November 1994, the Company purchased the technology for a pen-based
    software product for $400,000.
 
  . In February 1995, the Company purchased the software technology for a
    multimedia kiosk for $45,000. The Company is also obligated to make
    royalty payments to the former owners based on future sales of the
    product.
 
  The costs associated with these acquisitions was recorded as capitalized
software costs, since such products had reached technological feasibility at
the date of acquisition.
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
   
  Basis of Presentation--As discussed in Note 6, the redeemable convertible
preferred stock will be automatically converted upon the closing of the public
offering contemplated by this prospectus. The accompanying pro forma balance
sheet gives effect to this conversion as if it had occurred on June 30, 1996.
In addition, the pro forma balance sheet gives effect as of June 30, 1996 to
(i) the exercise of warrants to purchase 457,288 shares of common stock (to be
accomplished through the surrender of 52,223 shares of common stock), (ii) the
exercise of the Company's option to repurchase 400,000 shares of common stock,
as described in Note 5, and (iii) the payment of $75,000 to an existing
stockholder (see Note 11).     
 
  Cash and Cash Equivalents--Cash and cash equivalents include short-term,
highly liquid instruments, which consist primarily of money market accounts,
purchased with remaining maturities of three months or less.
 
  Fixed Assets--Fixed assets are recorded at cost. Depreciation is provided
using the straight-line method over the estimated useful lives of the
respective assets ranging from three to five years. Leasehold improvements are
amortized over the term of the lease or the lives of the assets, whichever is
shorter.
 
  Revenue Recognition and Concentration of Credit Risk--Revenue from
processing of qualification and activation transactions for wireless
telecommunications carriers is recognized in the period when services are
performed. Revenues derived from software implementation projects are
recognized throughout the performance period of the contracts. Revenues
arising from the prepayment of fees or from licensing agreements where the
Company has continuing vendor obligations are deferred. Software-related
revenues are less than 10% of total revenue for all periods presented with the
exception of the six months ended June 30, 1996 during which these items
comprised approximately 20% of total revenue.
 
  Substantially all of the Company's customers are providers of cellular
telephone service and are generally granted credit without collateral. The
Company's revenues vary throughout the year with the period of highest revenue
generally occurring during the period October 1 through December 31.
 
                                      F-7
<PAGE>
 
                               LIGHTBRIDGE, INC.
 
                  NOTES TO FINANCIAL STATEMENTS--(CONTINUED)
 
  Customers exceeding 10% of the Company's revenue during the years ended
September 30, 1993, 1994 and 1995, the three months ended December 31, 1994
and 1995, and the six months ended June 30, 1995 and 1996 are as follows:
 
<TABLE>
<CAPTION>
                                          PERCENT OF REVENUE
                              ---------------------------------------------------
                                                    THREE              SIX
                                                MONTHS ENDED      MONTHS ENDED
                               YEARS ENDED      ---------------   ---------------
                              SEPTEMBER 30,     DECEMBER 31,        JUNE 30,
                              ----------------  ---------------   ---------------
   CUSTOMER                   1993  1994  1995   1994     1995     1995     1996
   --------                   ----  ----  ----  ------   ------   ------   ------
   <S>                        <C>   <C>   <C>   <C>      <C>      <C>      <C>
    A.......................   20%   32%   31%      32%      22%      33%      19%
    B.......................   14    12    11       --       18       12       20
    C.......................   --    10    --       --       --       --       --
    D.......................   --    10    11       12       10       10       --
    E.......................   --    --    10       11       11       11       11
                              ---   ---   ---   ------   ------   ------   ------
                               34%   64%   63%      55%      61%      66%      50%
                              ===   ===   ===   ======   ======   ======   ======
</TABLE>
 
  For periods in which a customer represented less than 10% of revenues, such
customer's percent of revenue for that period is not presented.
 
  Income Taxes--The Company has adopted the provisions of Statement of
Financial Accounting Standards ("SFAS") No. 109, "Accounting for Income
Taxes." SFAS No. 109 requires the recognition of deferred tax assets and
liabilities for the expected future tax consequences of temporary differences
between the financial reporting and tax bases of existing assets and
liabilities. Deferred income tax assets are principally the result of net
operating loss carryforwards and differences in depreciation and amortization
for financial statement purposes and income tax purposes, and are recognized
to the extent realization of such benefits is more likely than not.
 
  Software Development Costs--Software development costs are capitalized after
establishment of technological feasibility as provided for under SFAS No. 86,
"Accounting for the Costs of Computer Software to be Sold, Leased, or
Otherwise Marketed."
 
  During the year ended September 30, 1995, the Company capitalized
approximately $980,400 of software development costs associated with the
development of two new products, including the costs of purchasing certain
technology (see Note 1). Capitalized software development costs are being
amortized to cost of revenues using the straight-line method over 24 months
which results in the highest levels of amortization. Accumulated amortization
was approximately $84,000, $218,000 and $406,000 at September 30, 1995,
December 31, 1995 and June 30, 1996, respectively. There were no amounts
capitalized prior to the year ended September 30, 1995.
 
  Development Costs--Development costs, which consist of research into and
development of new products and services, are expensed as incurred, except
costs which may be subject to capitalization under the provisions of SFAS No.
86.
 
  Supplemental Cash Flow Information--The Company entered into the following
noncash transactions:
 
<TABLE>
<CAPTION>
                                                             THREE MONTHS        SIX MONTHS
                                    YEARS ENDED                  ENDED              ENDED
                                   SEPTEMBER 30,             DECEMBER 31,         JUNE 30,
                           ------------------------------ ------------------- -----------------
                             1993      1994       1995       1994      1995     1995     1996
                           -------- ---------- ---------- ---------- -------- -------- --------
   <S>                     <C>      <C>        <C>        <C>        <C>      <C>      <C>
   Capital lease
    obligations incurred
    for the acquisition of
    fixed assets.......... $653,057 $3,256,900 $2,268,605 $1,720,863 $118,057 $379,013 $202,364
                           ======== ========== ========== ========== ======== ======== ========
   Exchange of notes and
    interest payable for
    common stock.......... $410,597
                           ========
</TABLE>
 
  In April 1996, the Company reacquired 200,000 shares of its common stock
from a former director. This repurchase was partially financed through the
issuance of an 8% note payable in the amount of $226,667.
 
                                      F-8
<PAGE>
 
                               LIGHTBRIDGE, INC.
 
                  NOTES TO FINANCIAL STATEMENTS--(CONTINUED)
   
  Pro Forma Income (Loss) Per Common Share--Pro forma income (loss) per common
share is based on the weighted average number of common and dilutive common
equivalent shares (common stock options and warrants) outstanding. The pro
forma weighted average number of common shares assumes that all series of
redeemable convertible preferred stock had been converted to common stock as
of the original issuance date. Common equivalent shares are not included in
the per share calculations where the effect of their inclusion would be anti-
dilutive, except in accordance with the requirements of Securities and
Exchange Commission Staff Accounting Bulletin No. 83. That Bulletin requires
all common shares issued and options or warrants to purchase common stock
granted by the Company during the twelve-month period prior to the filing of a
proposed initial public offering be included in the calculation as if they
were outstanding for all periods. For purposes of applying the Bulletin, the
Company has assumed an initial public offering price of $9 per share. Shares
of Series D redeemable convertible preferred stock have been treated as
outstanding in all periods for pro forma income (loss) per common share
pursuant to the Bulletin.     
 
  Historical income (loss) per share, which excludes the assumed conversion of
the redeemable convertible preferred stock, was as follows (in thousands):
 
<TABLE>     
<CAPTION>
                                                                  THREE MONTHS            SIX MONTHS
                                      YEARS ENDED                     ENDED                  ENDED
                                     SEPTEMBER 30,                DECEMBER 31,             JUNE 30,
                            ---------------------------------  --------------------  ----------------------
                              1993       1994        1995        1994       1995        1995        1996
                            ---------  ---------  -----------  ---------  ---------  -----------  ---------
   <S>                      <C>        <C>        <C>          <C>        <C>        <C>          <C>
   Net income (loss)....... $(125,423) $ 950,272  $(2,432,914) $ 411,723  $  72,205  $(1,735,842) $ 302,500
   Accretion of preferred
    dividends..............  (150,421)  (182,544)    (182,544)   (45,635)   (45,635)     (91,270)   (91,270)
                            ---------  ---------  -----------  ---------  ---------  -----------  ---------
   Net income (loss)
    available for common
    stock.................. $(275,844) $ 767,728  $(2,615,458) $ 366,088  $  26,570  $(1,827,112) $ 211,230
                            =========  =========  ===========  =========  =========  ===========  =========
   Net income (loss) per
    common share........... $   (0.04) $    0.10  $     (0.36) $    0.05  $     --   $     (0.25) $    0.02
   Weighted average number
    of common and common
    equivalent shares
    outstanding............ 6,525,147  7,748,919    7,367,171  7,847,346  7,867,275    7,367,066  8,499,506
</TABLE>    
 
  Fair Value of Financial Instruments--In the opinion of management, the
estimated fair value of the Company's financial instruments, which include
cash equivalents, accounts receivable and long-term debt, approximates their
carrying value.
 
 New Accounting Pronouncements--
 
    Impairment of Long-Lived Assets--In March 1995, the FASB issued SFAS No.
  121, "Accounting for the Impairment of Long-Lived Assets and for Long-Lived
  Assets to Be Disposed Of." SFAS No. 121 addresses the accounting for the
  impairment of long-lived assets, certain identifiable intangibles and
  goodwill when events or changes in circumstances indicate that the carrying
  amount of an asset may not be recoverable. The adoption of SFAS No. 121 in
  1996 did not have a material impact on the Company's results of operations,
  financial position or cash flows.
 
    Stock-Based Compensation--In November 1995, the FASB issued SFAS No. 123,
  "Accounting for Stock-Based Compensation." SFAS No. 123 addresses the
  financial accounting and reporting standards for stock-based employee
  compensation plans. SFAS No. 123 permits an entity to either record the
  effects of stock-based employee compensation plans in its financial
  statements or present pro forma disclosures in the notes to the financial
  statements. In connection with the adoption of SFAS No. 123 during 1996,
  the Company will elect to provide the appropriate disclosures in the notes
  to the financial statements. Since the Company does not expect to make
  significant equity awards to outsiders, adoption of SFAS No. 123 will not
  significantly impact the Company's results of operations, financial
  position or cash flows.
 
 
                                      F-9
<PAGE>
 
                               LIGHTBRIDGE, INC.
 
                  NOTES TO FINANCIAL STATEMENTS--(CONTINUED)
 
  Significant Estimates--The preparation of financial statements in conformity
with generally accepted accounting principles necessarily requires management
to make estimates. These estimates include provisions for bad debts, certain
accrued liabilities, recognition of revenue and expenses, and recoverability
of deferred tax assets. These estimates could change; however, the Company
does not expect any changes in the near term that would have a significant
impact on the financial statements.
 
  Interim Information--The results of operations and cash flows for the three-
month periods ended December 31, 1994 and 1995, and the six-month periods
ended June 30, 1995 and 1996 are not necessarily indicative of results which
would be expected for a full year. In the opinion of management, the financial
statements for the unaudited periods presented include all adjustments
necessary for a fair presentation in accordance with generally accepted
accounting principles, consisting solely of normal recurring accruals and
adjustments.
 
3. FIXED ASSETS
 
  Fixed assets consisted of the following:
 
<TABLE>
<CAPTION>
                                  SEPTEMBER 30,
                             ------------------------  DECEMBER 31,   JUNE 30,
                                1994         1995          1995         1996
                             -----------  -----------  ------------  -----------
   <S>                       <C>          <C>          <C>           <C>
   Furniture and fixtures..  $    18,704  $   118,408  $   117,876   $   129,567
   Leasehold improvements..      319,828      877,778      867,726       876,321
   Computer equipment......      528,784    1,115,014    1,161,052     1,453,901
   Computer equipment under
    capital leases.........    4,858,573    6,942,977    6,972,938     7,133,488
   Computer software.......      353,550      685,546      829,436       978,339
                             -----------  -----------  -----------   -----------
                               6,079,439    9,739,723    9,949,028    10,571,616
   Less accumulated depre-
    ciation
    and amortization.......   (1,978,147)  (4,419,891)  (5,067,373)   (6,481,994)
                             -----------  -----------  -----------   -----------
   Fixed assets--net.......  $ 4,101,292  $ 5,319,832  $ 4,881,655   $ 4,089,622
                             ===========  ===========  ===========   ===========
</TABLE>
 
  Accumulated amortization of equipment under capital leases was $1,242,725,
$3,155,114, $3,606,915 and $4,659,098 at September 30, 1994 and 1995, December
31, 1995 and June 30 , 1996, respectively.
 
4. NOTES PAYABLE
 
  The carrying value of notes payable consisted of the following:
 
<TABLE>
<CAPTION>
                              SEPTEMBER 30, 1994   SEPTEMBER 30, 1995     DECEMBER 31, 1995       JUNE 30, 1996
                             -------------------- --------------------- --------------------- ---------------------
                             HELD BY   HELD BY    HELD BY    HELD BY    HELD BY    HELD BY    HELD BY    HELD BY
                             RELATED UNAFFILIATED RELATED  UNAFFILIATED RELATED  UNAFFILIATED RELATED  UNAFFILIATED
                             PARTIES   PARTIES    PARTIES    PARTIES    PARTIES    PARTIES    PARTIES    PARTIES
                             ------- ------------ -------- ------------ -------- ------------ -------- ------------
   <S>                       <C>     <C>          <C>      <C>          <C>      <C>          <C>      <C>
   Line-of-credit/demand
    note borrowings........  $   --   $  250,000  $    --   $1,000,000  $    --   $1,500,000  $    --   $1,500,000
   8% subordinated notes...   87,701   1,754,018    89,576   1,789,643    90,045   1,798,549    90,514   1,807,156
   16% subordinated notes..      --          --     69,071     976,992    74,253   1,050,288       --          --
   8% note payable-
    settlement shares......      --          --        --          --        --          --    226,667         --
                             -------  ----------  --------  ----------  --------  ----------  --------  ----------
   Total...................   87,701   2,004,018   158,647   3,766,635   164,298   4,348,837   317,181   3,307,156
   Less current portion....      --      250,000    69,071   1,976,992       --    1,500,000   113,333   1,500,000
                             -------  ----------  --------  ----------  --------  ----------  --------  ----------
   Long-term portion.......  $87,701  $1,754,018  $ 89,576  $1,789,643  $164,298  $2,848,837  $203,848  $1,807,156
                             =======  ==========  ========  ==========  ========  ==========  ========  ==========
</TABLE>
 
 
                                     F-10
<PAGE>
 
                               LIGHTBRIDGE, INC.
 
                  NOTES TO FINANCIAL STATEMENTS--(CONTINUED)
 
  During 1994 and 1995, the Company had a line of credit agreement with a bank
(the "Bank Agreement") which permitted the Company to borrow up to $2,000,000
($1,000,000 during 1994) subject to certain borrowing formulas established by
the bank. Interest based on prime plus .5% was charged on any outstanding
borrowings. In December 1995, the Bank Agreement was amended to reduce the
amount of permitted borrowings to $1,500,000 and the outstanding borrowings
under the Bank Agreement, $1,500,000, were converted to a demand note due in
March 1996. At December 31, 1995 and March 31, 1995, the Company was not in
compliance with certain covenants contained in the Bank Agreement including
covenants related to liquidity, tangible net worth, profitability and debt to
tangible net worth, as defined. The Company obtained agreements from the bank
for these violations, in which the bank agreed to forebear from exercising its
remedies for default, including the right to require payment on demand prior
to March 1996 and June 1996, respectively. The demand note was collateralized
by the Company's accounts receivable, equipment and intangible assets. The
weighted average interest rate for borrowings under the Bank Agreement during
the years ended September 30, 1994 and 1995 and the three months ended
December 31, 1995 approximated 9.75%, 9.9% and 9.5%, respectively.
 
  Subsequent to December 31, 1995, the Bank Agreement was amended (the
"Amended Bank Agreement") to replace the demand note with a line-of-credit
feature and certain other provisions were modified to increase the maximum
borrowing limit to $4,000,000, decrease the interest rate to prime plus .25%
and extend the agreement to June 1997. The Amended Bank Agreement contains
certain restrictions which, among others, limits the Company's ability to pay
cash dividends and requires the Company to achieve defined levels of quarterly
earnings and tangible net worth, as well as meeting defined ratios of senior
liabilities to net worth and quick assets. Borrowings under the Amended Bank
Agreement are collateralized by the Company's accounts receivable, equipment
and intangible assets. After giving effect to an amendment to the Amended Bank
Agreement dated August 8, 1996, the Company was in compliance with the
required financial covenants and ratios as of June 30, 1996. Further, the
Company believes that the August 8, 1996 amendment will permit the Company to
remain in compliance with the required financial covenants and ratios
throughout the term of the Amended Bank Agreement.
 
  The Company has a $500,000 line of credit to be used for equipment purchases
(the "Equipment Line"). Borrowings under the Equipment Line are payable in 36-
monthly installments of principal and interest commencing April 5, 1995 and
ending March 5, 1998. Interest on the Equipment Line is payable at prime plus
1%. Subsequent to December 31, 1995, certain provisions of the Equipment Line
were modified whereby the interest rate was reduced to prime plus .75%, the
maximum borrowing amount was increased to $2,000,000 and expiration date was
changed to June 1999. At December 31, 1995, there were no borrowings
outstanding on the Equipment Line.
 
  8% Subordinated Notes--In August 1994, the Company issued $2,100,000 of
subordinated notes to certain holders of the Company's common and mandatory
redeemable preferred stock, with immediately exercisable warrants for the
purchase of 525,000 shares of the Company's common stock. The warrants are
exercisable through June 30, 2001 at a price of $2 per share and have been
appraised and recorded at an aggregate market value of $262,500. The related
discount on the subordinated notes ($262,500 at time of issuance) is being
accreted over the term of the notes. Interest expense for the years ended
September 30, 1994 and 1995 and for the three months ended December 31, 1995,
includes accretion related to these notes of approximately $4,200, $37,500 and
$9,375, respectively. Interest on the notes is payable quarterly at an annual
rate of 8%. Principal is payable in quarterly installments of $131,250
beginning on September 30, 1997 through maturity (2001). The notes are
redeemable at the Company's option at par plus declining premiums at various
dates.
 
  16% Subordinated Notes--In August 1995, the Company issued $1,151,000 of 16%
subordinated notes to certain holders of the Company's redeemable preferred
stock, with immediately exercisable warrants for the purchase of 287,750
shares of the Company's common stock. Interest on the notes was accrued
monthly, and
 
                                     F-11
<PAGE>
 
                               LIGHTBRIDGE, INC.
 
                  NOTES TO FINANCIAL STATEMENTS--(CONTINUED)

principal and accrued interest were payable at January 31, 1996. Such
repayment obligations were extended by the note holders until such time as the
Company completed the placement of its Series D Preferred Stock, which
occurred on April 4, 1996. The warrants are exercisable through June 30, 2001
at a price of $2 per share and have been appraised and recorded at an
aggregate market value of $143,875. The related discount on the subordinated
note ($143,875 at time of issuance) is being accreted over the originally
scheduled term of the notes. Interest expense for the year ended September 30,
1995 and for the three months ended December 31, 1995 includes approximately
$38,900 and $78,500 of accretion, respectively. The Company repaid principal
and interest related to these notes in full upon the sale of its Series D
Preferred Stock. The amount outstanding related to these notes has been
classified as long term at December 31, 1995, reflecting the Company's
refinancing of this obligation through the issuance of Series D Preferred
Stock.
 
5. COMMITMENTS AND CONTINGENCIES
 
  Leases--The Company leases computer and other equipment under various,
noncancelable leases which have been capitalized for financial reporting
purposes. The Company has noncancelable operating lease agreements for office
space and certain equipment. Future minimum payments under capital and
operating leases consist of the following at December 31, 1995:
 
<TABLE>
<CAPTION>
   YEAR ENDING                                                        OPERATING
   DECEMBER 31                                         CAPITAL LEASES   LEASES
   -----------                                         -------------- ----------
   <S>                                                 <C>            <C>
     1996.............................................  $ 2,373,156   $1,243,125
     1997.............................................    1,530,940    1,231,090
     1998.............................................       53,499    1,059,725
     1999.............................................          --     1,028,706
     2000.............................................          --       887,684
     Thereafter.......................................          --       431,657
                                                        -----------   ----------
     Total minimum lease payments.....................    3,957,595   $5,881,987
                                                                      ==========
     Less amount representing interest................     (381,572)
                                                        -----------
     Present value of future minimum lease payments...    3,576,023
     Less current portion.............................   (2,073,895)
                                                        -----------
     Long-term portion................................  $ 1,502,128
                                                        ===========
</TABLE>
 
  During the year ended September 30, 1994, certain payments due under capital
lease agreements with related parties were not made at the request of the
lessor. Such deferred payments aggregated $784, $0 and $0 at September 30,
1994 and 1995 and December 31, 1995, respectively, and are included in
accounts payable--related parties. No interest was accrued on these amounts
subsequent to their original due date.
 
  Rent expense for operating leases was $271,982, $453,687, $1,502,745,
$405,302, $814,910 and $741,747 for the years ended September 30, 1993, 1994
and 1995, for the three months ended December 31, 1995, and for the six months
ended June 30, 1995 and 1996, respectively.
   
  Litigation--Subsequent to December 31, 1995, the Company and certain
affiliates (the "Entrepreneurial Partnerships") (collectively, the
"Plaintiffs") reached an agreement to settle various lawsuits between the
Plaintiffs and a former director of the Company (see Note 11). In addition to
settling all claims and disputes, the former director agreed, in exchange for
payments of $25,500, to grant the Company and the Entrepreneurial
Partnerships' various options to purchase the Company's common stock from the
former director (the "Settlement Shares"). The Company's purchase option
permits the Company to purchase Settlement Shares in 200,000 share allotments
during three specified periods of time through February 1997 at purchase
prices of $1.70, $1.95 and $2.20 per share during the first, second and final
share allotments, respectively. In the event     
 
                                     F-12
<PAGE>
 
                               LIGHTBRIDGE, INC.
 
                  NOTES TO FINANCIAL STATEMENTS--(CONTINUED)

that the Company chooses not to immediately pay for the Settlement Shares, a
portion of the purchase price (66 2/3%) may be financed by issuing the former
director an 8% two-year note.
 
  On April 1, 1996, the Company exercised its option to purchase 200,000
Settlement Shares at a price of $1.70 per share for cash consideration of
$113,333 deposited with the selling shareholder on March 28, 1996 and an 8%
two-year note for $226,667. In connection with the exercise of the options by
the Entrepreneurial Partnerships, on March 28, 1996 the Company loaned an
aggregate of $113,333 to the Entrepreneurial Partnerships at an interest rate
of 16%. Such amount was repaid in June 1996. In May 1996, the Company
repurchased for cash consideration an additional 200,000 shares of its common
stock from certain Entrepreneurial Partnerships at a price of $1.70 per share
and reimbursed the Entrepreneurial Partnerships, by means of a distribution,
certain legal fees and expenses incurred by them in connection with the
litigation against the former director in an aggregate amount of $260,000.
 
6. REDEEMABLE CONVERTIBLE PREFERRED STOCK
 
  Redeemable convertible preferred stock, par value of $.01, consists of the
following at September 30, 1994 and 1995 and December 31, 1995:
 
  . Series A; 630,516 shares authorized, issued and outstanding
 
  . Series B; 620,000 shares authorized, issued and outstanding
 
  . Series C; 225,000 shares authorized, 200,789 shares issued and
    outstanding
 
  In April 1996, 1,000,000 shares of Series D Preferred Stock were issued, of
which all remained outstanding at June 30, 1996. There were no changes in the
number of outstanding shares of Series A, B and C Preferred Stock during the
six-month period ended June 30, 1996.
 
  Changes in redeemable convertible preferred stock were as follows:
 
<TABLE>
<CAPTION>
                             SERIES A   SERIES B  SERIES C  SERIES D    TOTAL
                            ---------- ---------- -------- ---------- ----------
<S>                         <C>        <C>        <C>      <C>        <C>
Balances, October 1, 1993.  $1,130,475 $1,204,729 $597,567 $      --  $2,932,771
Dividends accreted........      15,668        --       --                 15,668
                            ---------- ---------- -------- ---------- ----------
Balances, September 30,
 1994.....................   1,146,143  1,204,729  597,567        --   2,948,439
Dividends accreted........      60,978     76,104   45,462        --     182,544
                            ---------- ---------- -------- ---------- ----------
Balances, September 30,
 1995.....................   1,207,121  1,280,833  643,029        --   3,130,983
Dividends accreted........      15,244     19,026   11,365        --      45,635
                            ---------- ---------- -------- ---------- ----------
Balances, December 31,
 1995.....................   1,222,365  1,299,859  654,394        --   3,176,618
Stock issued, net of issu-
 ance costs of $41,600 ...         --         --       --   5,958,400  5,958,400
Dividends accreted........      30,488     38,052   22,730        --      91,270
                            ---------- ---------- -------- ---------- ----------
Balances, June 30, 1996...  $1,252,853 $1,337,911 $677,124 $5,958,400 $9,226,288
                            ========== ========== ======== ========== ==========
</TABLE>
 
  In February 1991, the Company issued 630,516 shares of redeemable
convertible preferred stock ("Series A Preferred Stock") for an aggregate
purchase price of $1,000,000, of which 315,258 shares were issued to a third-
party investor and 315,258 shares were issued to certain Entrepreneurial
Partnerships which are related parties.
 
  In December 1991, the Company issued 620,000 shares of redeemable
convertible preferred stock ("Series B Preferred Stock") for an aggregate
purchase price of $1,085,000.
 
  In June 1993, the Company issued 200,789 shares of redeemable convertible
preferred stock ("Series C Preferred Stock") for an aggregate purchase price
of $602,367.
 
  In April 1996, the Company issued 1,000,000 shares of redeemable convertible
preferred stock ("Series D Preferred Stock") for an aggregate purchase price
of $6,000,000.
 
 
                                     F-13
<PAGE>
 
                               LIGHTBRIDGE, INC.
 
                  NOTES TO FINANCIAL STATEMENTS--(CONTINUED)
 
  Conversion--Each share of Series A and Series D Preferred Stock is
convertible into two shares of common stock. Each share of Series B and Series
C Preferred Stock is convertible into approximately 2.42 and 2.40 shares of
common stock, respectively. The Series A, Series B, Series C and Series D
Preferred Stock ("Serial Preferred Stock") is convertible upon a sale of the
Company's stock or net assets for an amount in excess of $7,500,000, with a
minimum price per share of $5.25.
 
  Dividends--On October 1, 1992, the Series A and Series B Preferred Stock
began accruing dividends at the rate of 8% per annum. The Series C Preferred
Stock began accruing dividends at the rate of 8% per annum beginning on
October 1, 1993. The Series D Preferred Stock began accruing dividends at the
rate of 8% per annum beginning on April 2, 1996. Prior to the issuance of the
Series D Preferred Stock, the Series A, Series B and Series C Preferred Stock
dividends were payable in cash for fiscal years in which the Company has net
income in excess of $500,000 and would accrue in all other years. Accrued
dividends outstanding for any year were payable in cash in subsequent years to
the extent net income exceeded the required minimum of $500,000 by an
additional $500,000. No dividends have been paid in the years ended September
30, 1994 and 1995 and the three months ended December 31, 1995. Since the
issuance of the Series D Preferred Stock, the Series A, Series B and Series C
Preferred Stock dividends are payable in cash or by subordinated promissory
note for fiscal years in which the Company has net income of $1,000,000 or
more, to the extent of the lesser of 20% of net income in excess of $1,000,000
or all dividends then payable. For financial reporting purposes, the dividends
are being accreted ratably over the period the Serial Preferred Stock is
expected to be outstanding to the extent not required to be paid. Dividends
payable for all periods presented consisted of $80,076 and $86,800 required to
be paid on the Series A and Series B Preferred Stock, respectively, as a
result of the Company's 1994 net income.
 
  Liquidation Preference--In the event of a liquidation, merger,
consolidation, or sale of the Company's assets, the holders of the various
classes of Serial Preferred Stock will be entitled to receive a liquidation
preference equal to their aggregate purchase price plus accreted and unpaid
dividends outstanding prior to any distributions to holders of common stock of
the Company.
 
  Redemption--Prior to the issuance of the Series D Preferred Stock, the
Series A and Series B Preferred Stock had a mandatory redemption date of
December 31, 1997 and the Series C Preferred Stock had a mandatory redemption
date of December 31, 1999. Since the issuance of the Series D Preferred Stock,
holders of two-thirds of all shares of Serial Preferred Stock may, commencing
on April 1, 2000 and on the same date in each following year, require the
Company to redeem 1/3 of their shares. The redemption amount equals the higher
of the fair market value of the preferred stock as of the fiscal year end
closest to the redemption date or an amount equal to the aggregate purchase
price plus accrued dividends outstanding.
 
  Voting Rights--Each share of Serial Preferred Stock entitles the holder to
the number of votes per share equivalent to the number of common shares into
which each share of preferred stock is then convertible.
 
  Equity Financing--The Company secured a round of equity financing, which
consisted of the issuance of the Series D Preferred Stock on April 4, 1996.
The total proceeds from the financing were $6,000,000 and were used, in part,
to retire the 16% subordinated notes.
 
7. COMMON STOCK, OPTIONS AND WARRANTS (SEE NOTE 11)
 
  Increase in Authorized Shares--On March 29, 1996, the Company's Board of
Directors increased the number of authorized shares of $.01 par value common
stock from 14,000,000 to 20,000,000 shares, of which 2,000,000 of such shares
was reserved for the conversion of the Company's Series D Preferred Stock.
 
  Stock Option Plan--Under the Company's stock option plan, the Company may
grant either incentive or nonqualified stock options to officers, directors,
employees or consultants for the purchase of up to 1,800,000 shares of common
stock. Options will be granted with an exercise price equal to the common
stock's market value at the date of grant, as determined by the Board of
Directors, and will expire ten years later. On March 29, 1996, the Board of
Directors increased the number of options available for grant to 2,400,000.
 
                                     F-14
<PAGE>
 
                               LIGHTBRIDGE, INC.
 
                  NOTES TO FINANCIAL STATEMENTS--(CONTINUED)
 
  Stock option activity was as follows:
 
<TABLE>
<CAPTION>
                                                      THREE MONTHS SIX MONTHS
                                                         ENDED        ENDED
                                                      ------------ -----------
                                   YEARS ENDED
                                  SEPTEMBER 30,
                               ---------------------  DECEMBER 31,  JUNE 30,
                                 1994        1995         1995        1996
                               ---------  ----------  ------------ -----------
<S>                            <C>        <C>         <C>          <C>
Outstanding, beginning of
 period.......................   991,184     716,100    1,013,700    1,072,700
  Granted:
    Options...................   200,000     321,700      233,500      625,800
    Range of exercise prices
     in dollars per share..... $   0.375  $  .50-.75   $     0.75  $ 0.75-8.50
  Exercised...................   (86,100)     (2,516)     (74,350)     (19,670)
  Cancelled...................  (388,984)    (21,584)    (100,150)     (63,030)
                               ---------  ----------   ----------  -----------
Outstanding, end of period....   716,100   1,013,700    1,072,700    1,615,800
                               =========  ==========   ==========  ===========
Options exercisable...........                            426,832      561,915
                                                       ==========  ===========
Aggregate option price........                         $   55,724  $   238,024
                                                       ==========  ===========
</TABLE>
 
  Common Stock Warrants--The Company has issued warrants to purchase 1,270,038
shares of the Company's common stock at exercise prices ranging from $0.793 to
$2.00 per share. Warrants issued prior to August 1994 were assigned nominal
value based upon management's estimate of their fair market value. Warrants
issued in connection with the Company's issuance of subordinated notes (see
Note 4) have been ascribed an aggregate value of $406,375.
 
  Reserved Shares--The Company has reserved 4,920,020 shares of common stock
for issuance upon the conversion of the Serial Preferred Stock and for the
exercise of stock options and warrants.
 
  Note Receivable, Stockholder--The Company holds a note receivable from a
stockholder for the purchase of common stock of the Company. The note, which
totals $13,085, is collateralized by the common stock held by the noteholder,
is due on demand and bears interest at 12%.
 
8.  INCOME TAXES
 
  In October 1993, the Company implemented the provisions of SFAS No. 109. The
cumulative effect of this change did not have a material effect on the
Company's results of operations, financial position or cash flows as a result
of the valuation allowance established at the time of adoption.
 
  The income tax (benefit) provision for the years ended September 30, and for
the three months ended December 31, consisted of the following:
 
<TABLE>
<CAPTION>
                                                                    THREE MONTHS
                                        YEARS ENDED SEPTEMBER 30,      ENDED
                                       -----------------------------DECEMBER 31,
                                        1993      1994       1995       1995
                                       -------------------  --------------------
   <S>                                 <C>     <C>          <C>     <C>
   Current:
     Federal.......................... $   --  $   299,341  $   --     $2,400
     State............................     --       89,156      --        --
   Deferred:
     Federal..........................     --     (278,341)     --        --
     State............................     --      (87,256)     --        --
                                       ------- -----------  -------    ------
   Income tax provision............... $   --  $    22,900  $   --     $2,400
                                       ======= ===========  =======    ======
</TABLE>
 
                                     F-15
<PAGE>
 
                               LIGHTBRIDGE, INC.
 
                  NOTES TO FINANCIAL STATEMENTS--(CONTINUED)
 
  The tax effects of temporary differences that give rise to significant
portions of deferred tax assets and liabilities are as follows:
 
<TABLE>
<CAPTION>
                                              SEPTEMBER 30,
                                         ------------------------  DECEMBER 31,
                                            1994         1995          1995
                                         -----------  -----------  ------------
   <S>                                   <C>          <C>          <C>
   Deferred tax assets:
     Depreciation and amortization...... $   962,278  $ 1,894,190  $ 2,167,010
     Interest on capital leases.........     237,740      451,069      495,678
     Accrued expenses and reserves......     102,453      227,787      239,212
     Net operating loss carryforwards...     282,962      946,098      842,847
   Deferred tax liabilities:
     Equipment leases capitalized.......  (1,038,500)  (2,012,418)  (2,292,090)
     Other..............................      (7,582)     (10,985)     (12,127)
   Valuation allowance..................    (539,351)  (1,495,741)  (1,440,530)
                                         -----------  -----------  -----------
   Net deferred tax asset............... $       --   $       --   $       --
                                         ===========  ===========  ===========
</TABLE>
 
  The following is a reconciliation of income taxes at the federal statutory
rate to the Company's effective tax rate:
 
<TABLE>
<CAPTION>
                                             SEPTEMBER 30,
                                            --------------------   DECEMBER 31,
                                            1993    1994   1995        1995
                                            -----   ----   -----   ------------
   <S>                                      <C>     <C>    <C>     <C>
   Statutory federal income tax rate.......   (34)%   34 %   (34)%       34%
   Loss producing no tax benefit...........    34    --       34        --
   Alternative minimum tax asset, not
    assured of realization.................   --       2     --           3
   Net operating loss carryforwards........   --     (34)    --         (34)
                                            -----   ----   -----       ----
   Effective tax rate......................   --  %    2 %   --  %        3 %
                                            =====   ====   =====       ====
</TABLE>
 
  The net change in the valuation allowance for the years ended September 30,
1994 and 1995, and the three month period ended December 31, 1995 was an
increase (decrease) of ($409,258), $956,390 and $(55,211), respectively. At
December 31, 1995, the Company had net operating loss carryforwards for
federal income tax purposes of $2.1 million, expiring at various dates through
2010.
 
9. EMPLOYEE PROFIT SHARING PLAN
 
  The Company has a 401(k) Employee Profit Sharing Plan (the "Plan"). Under
the Plan, the Company, at its discretion, may make contributions to match
employee contributions. All employees of the Company are eligible to
participate, subject to employment eligibility requirements. Vesting of
employer contributions occurs ratably over a five-year period. Employer
contributions amounted to approximately $14,000, $27,500, $43,000 $20,000 and
$31,000 for the years ended September 30, 1993, 1994 and 1995, the three
months ended December 31, 1995, and the six months ended June 30, 1996,
respectively.
 
10. RELATED-PARTY TRANSACTIONS
 
  Under an agreement dated February 28, 1990, the Company granted an exclusive
license to Rent Grow, Inc. ("Rent Grow"), a company having certain common
investors with the Company, to use the Company's Credit Decision System in the
rental real estate market. Under the terms of the agreement, the Company is to
receive $250,000, comprised of five installments in varying amounts through
August 1996. For financial
 
                                     F-16
<PAGE>
 
                               LIGHTBRIDGE, INC.
 
                  NOTES TO FINANCIAL STATEMENTS--(CONTINUED)
 
reporting purposes, the remaining receivable has been recorded at its net
present value, estimated to be approximately $87,000, $46,000 and $46,000 at
September 30, 1994 and 1995 and December 31, 1995, respectively. In addition,
this agreement provides for the Company to maintain the licensed software, at
Rent Grow's option, at an annual amount equal to 15% of the license amount,
which the Company believes exceeds the cost of providing such maintenance.
 
  The Company has received advances from various Entrepreneurial Partnerships
and their general partners and has issued preferred stock to various
Entrepreneurial Partnerships. The Company leased computer equipment from
various Entrepreneurial Partnerships. The general partners of these
partnerships are also stockholders of the Company. In 1992, the Company sold
and leased back equipment from an Entrepreneurial Partnership resulting in a
gain of $12,518, which was deferred and amortized over the capital lease term.
The amount deferred was $2,781, $0 and $0 as of September 30, 1994 and 1995
and December 31, 1995, respectively.
 
11. SUBSEQUENT EVENTS
 
  Stock Split--On June 14, 1996, the Board of Directors authorized a two for
one stock split effective on July 15, 1996. All shares and per share
information included in the financial statements has been restated to reflect
this stock split. In addition, the number of shares of authorized common stock
was increased to 20,000,000. The Board also voted to increase the number of
authorized shares of common stock to 60,000,000, effective immediately after
closing of the Company's initial public offering.
 
  Employee Stock Plans--On June 14, 1996, the Board of Directors authorized
and the stockholders approved the adoption of the following plans for the
issuance of options or sale of shares to employees, all to be effective
immediately after the closing of the Company's initial public offering:
 
  1996 Incentive and Nonqualified Stock Option Plan--The 1996 Incentive and
  Nonqualified Stock Option Plan provides for the issuance of up to 1,000,000
  options to purchase shares of common stock. Options may be either qualified
  incentive stock options or nonqualified stock options at the discretion of
  the Board of Directors. Exercise prices will be either fair market value on
  the date of grant, in the case of incentive stock options, or set by the
  Board of Directors at the date of grant, in the case of nonqualified
  options.
 
  1996 Stock Purchase Plan--The 1996 Stock Purchase Plan provides for the
  sale of up to 100,000 shares of common stock to employees every six months
  through payroll deductions. Employees will be allowed to purchase shares at
  a 15% discount from the lower of fair value at the beginning or end of the
  purchase periods.
   
  Equipment Line Borrowings--Subsequent to June 30, 1996, the Company borrowed
an aggregate of $763,000 under its Equipment Line agreement.     
   
  Stockholder Matters--On August 26, 1996, the Company entered into an
agreement with the former director (see Note 5) pursuant to which the Company
paid $75,000 to the former director and granted the former director a warrant
to purchase 100,000 shares of the Company's Common Stock at the initial public
offering price in exchange for the execution of certain agreements related to
the public offering contemplated by this Prospectus.     
 
                                  * * * * * *
 
                                     F-17
<PAGE>
 
 
 
                       [IMAGE OF LIGHTBRIDGE, INC. LOGO]
 
 
<PAGE>
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
 No dealer, salesperson or other person has been authorized to give any infor-
mation or to make any representations other than those contained in this Pro-
spectus in connection with the offering covered by this Prospectus and, if
given or made, such information or representations must not be relied upon as
having been authorized by the Company, the Selling Stockholders or the Under-
writers. This Prospectus does not constitute an offer to sell, or a solicita-
tion of an offer to buy, the Common Stock in any jurisdiction where, or to any
person to whom, it is unlawful to make such offer or solicitation. Neither the
delivery of this Prospectus nor any sale made hereunder shall, under any cir-
cumstances, create an implication that there has not been any change in the
facts set forth in this Prospectus or in the affairs of the Company since the
date hereof.
 
                              -------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Prospectus Summary........................................................    3
Risk Factors..............................................................    6
Use of Proceeds...........................................................   15
Dividend Policy...........................................................   15
Capitalization............................................................   16
Dilution..................................................................   17
Selected Financial Data...................................................   18
Management's Discussion and Analysis of Financial Condition and Results of
 Operations...............................................................   19
Business..................................................................   29
Management................................................................   43
Certain Transactions......................................................   48
Principal and Selling Stockholders........................................   50
Description of Capital Stock..............................................   53
Shares Eligible for Future Sale...........................................   56
Underwriting..............................................................   58
Legal Matters.............................................................   59
Experts...................................................................   59
Additional Information....................................................   59
Index to Financial Statements.............................................  F-1
</TABLE>
 
                              -------------------
 
 Until    , 1996 (25 days after the date of this Prospectus), all dealers ef-
fecting transactions in the Common Stock offered hereby, whether or not par-
ticipating in this distribution, may be required to deliver a Prospectus. This
is in addition to the obligation of dealers to deliver a Prospectus when act-
ing as underwriters and with respect to their unsold allotments or
subscriptions.
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
                                
                             3,800,000 Shares     
 
                        [LIGHTBRIDGE LOGO APPEARS HERE]
 
                                 Common Stock
 
                              -------------------
                                  PROSPECTUS
                              -------------------
 
 
                                COWEN & COMPANY
 
                             MONTGOMERY SECURITIES
 
                      PRUDENTIAL SECURITIES INCORPORATED
 
                                       , 1996
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
                                    PART II
 
                    INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
  The following table sets forth the various expenses to be paid by the
Company in connection with the issuance and distribution of the securities
being registered, other than underwriting discounts and commissions. All
amounts shown are estimates except for amounts of filing and listing fees. The
Company will pay all expenses in connection with the issuance and distribution
of any securities sold by the Selling Stockholders, except for underwriting
discounts and commissions and for any fees of counsel selected by any
particular Selling Stockholder to act in addition to or in lieu of the counsel
for the Selling Stockholders appointed by the Company.
 
<TABLE>       
     <S>                                                                <C>
     Filing fee of Securities and Exchange Commission.................. $ 16,140
     Filing fee of National Association of Securities Dealers, Inc.....    4,870
     Listing fee of Nasdaq Stock Market, Inc...........................   50,000
     Premium for directors' and officers' insurance....................  235,000
     Accounting fees and expenses......................................  165,000
     Blue sky fees and expenses (including related legal fees).........   25,000
     Legal fees and expenses...........................................  265,000
     Printing and engraving expenses...................................   60,000
     Transfer agent fees...............................................    5,000
     Miscellaneous.....................................................   23,990
                                                                        --------
         Total......................................................... $850,000
                                                                        ========
</TABLE>    
 
ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
  Section 145 of the Delaware General Corporation Law affords a Delaware
corporation the power to indemnify its present and former directors and
officers under certain conditions. Article SEVENTH of the Restated Charter
provides that the Company shall indemnify each person who at any time is, or
shall have been, a director or officer of the Company, and is threatened to be
or is made a party to any threatened, pending or completed action, suit or
proceeding, whether civil, criminal, administrative or investigative, by
reason of the fact that he is, or was, a director or officer of the Company,
or served at the request of the Company as a director, officer, employee,
trustee, or agent of another corporation, partnership, joint venture, trust or
other enterprise, against expenses (including attorneys' fees), judgments,
fines and amounts paid in settlement incurred in connection with any such
action, suit or proceeding to the maximum extent permitted by the Delaware
General Corporation Law.
 
  Section 102(b)(7) of the Delaware General Corporation Law gives a Delaware
corporation the power to adopt a charter provision eliminating or limiting the
personal liability of directors to the corporation or its stockholders for
breach of fiduciary duty as directors, provided that such provision may not
eliminate or limit the liability of directors for (i) any breach of the
director's duty of loyalty to the corporation or its stockholders, (ii) any
acts or omissions not in good faith or which involve intentional misconduct or
a knowing violation of law, (iii) any payment of a dividend or approval of a
stock purchase that is illegal under Section 174 of the Delaware Corporation
Law or (iv) any transaction from which the director derived an improper
personal benefit. Article NINTH of the Restated Charter provides that to the
maximum extent permitted by the General Corporation Law of the State of
Delaware, no director of the Company shall be personally liable to the Company
or to any of its stockholders for monetary damages arising out of such
director's breach of fiduciary duty as a director of the Company. No amendment
to or repeal of the provisions of Article NINTH shall apply to or have any
effect of the liability or the alleged liability of any director of the
Corporation with respect to any act or failure to act of such director
occurring prior to such amendment or repeal. A principal effect of such
Article
 
                                     II-1
<PAGE>
 
NINTH is to limit or eliminate the potential liability of the Company's
directors for monetary damages arising from breaches of their duty of care,
unless the breach involves one of the four exceptions described in (i) through
(iv) above. Article NINTH does not prevent stockholders from obtaining
injunctive or other equitable relief against directors, nor does it shield
directors from liability under federal or state securities laws.
 
  Section 145 of the Delaware General Corporation Law also affords a Delaware
corporation the power to obtain insurance on behalf of its directors and
officers against liabilities incurred by them in those capacities. The Company
is procuring a directors' and officers' liability and company reimbursement
liability insurance policy that (a) insures directors and officers of the
Company against losses (above a deductible amount) arising from certain claims
made against them by reason of certain acts done or attempted by such
directors or officers and (b) insures the Company against losses (above a
deductible amount) arising from any such claims, but only if the Company is
required or permitted to indemnify such directors or officers for such losses
under statutory or common law or under provisions of the Restated Charter or
the Restated By-Laws.
 
  Reference is also made to Section 6 of the Underwriting Agreement between
the Company, the Selling Stockholders and the Underwriters, filed as Exhibit
1.1 of this Registration Statement, for a description of indemnification
arrangements between the Company, the Selling Stockholders and the
Underwriters.
 
ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES
 
  The following information is furnished with regard to all securities sold by
the Company within the past three years which were not registered under the
Securities Act.
 
    (a) On the dates set forth below the Company issued and sold the number
  of shares of its Common Stock indicated upon exercise of stock options held
  by certain of its employees.
 
<TABLE>
<CAPTION>
                                                     NUMBER OF
      DATE OF SALE                                 SHARES ISSUED EXERCISE PRICE
      ------------                                 ------------- --------------
     <S>                                           <C>           <C>
     June 30, 1993................................    500,000      $20,000.00
     September 1, 1993............................      2,000          180.00
     September 30, 1993...........................     50,000        2,000.00
     December 30, 1993............................     50,000        2,000.00
     April 1, 1994................................      1,100           88.00
     June 1, 1994.................................        750           60.00
     September 30, 1994...........................     27,500        1,100.00
     February 1, 1995.............................      1,046           69.84
     April 27, 1995...............................      1,470           99.60
     December 1, 1995.............................     51,850        2,108.00
     December 28, 1995............................     22,500          900.00
     January 29, 1996.............................        400          200.00
     January 31, 1996.............................        100           50.00
     March 1, 1996................................      1,900          112.00
     March 15, 1996...............................      5,150        1,807.50
     April 30, 1996...............................     12,000        9,000.00
     June 1, 1996.................................        120           18.00
</TABLE>
     
    (b) On August 26, 1996, the Company issued and sold to an existing
  stockholder a warrant to purchase 100,000 shares of Common Stock at a price
  equal to the initial public offering price.     
     
    (c) On June 30, 1996, the Company issued and sold 62,500 shares of its
  Common Stock upon exercise of a warrant held by an accredited investor.
         
    (d) On April 3, 1996, the Company issued and sold 1,000,000 shares of its
  Series D Redeemable Convertible Preferred Stock to accredited investors for
  an aggregate price of $6,000,000.     
 
                                     II-2
<PAGE>
 
     
    (e) On the dates set forth below the Company issued and sold to
  accredited investors, including certain of its existing stockholders, 16%
  subordinated promissory notes in the principal amounts indicated and
  warrants to purchase the number of shares of Common Stock indicated. The
  aggregate price paid by each purchaser for the note and warrants was equal
  to the principal amount of the note purchased.     
 
<TABLE>
<CAPTION>
                                                             NUMBER OF SHARES
                                           PRINCIPAL AMOUNT   OF COMMON STOCK
     DATE OF SALE                              OF NOTES     UNDERLYING WARRANTS
     ------------                          ---------------- -------------------
     <S>                                   <C>              <C>
     August 24, 1995......................     $151,000           37,750
     August 17, 1995......................      300,000           75,000
     August 16, 1995......................       50,000           12,500
     August 15, 1995......................      100,000           25,000
     August 14, 1995......................      100,000           25,000
     August 11, 1995......................      200,000           50,000
     August 4, 1995.......................      250,000           62,500
</TABLE>
     
    (f) On August 29, 1994, the Company issued and sold to accredited
  investors 8% subordinated promissory notes in the aggregate principal
  amount of $2,100,000 and warrants to purchase 525,000 shares (subject to
  certain adjustments) of Common Stock for a price of $2,100,000.     
     
    (g) On August 10, 1993, the Company issued and sold 8,333 shares of
  Series C Redeemable Convertible Preferred Stock to an accredited investor
  for an aggregate price of $24,999.     
 
  The issuances described in Item 15(a) were made in reliance upon the
exemptions from registration set forth in Rule 701 under the Securities Act.
The other issuances described in this Item 15 were made in reliance upon the
exemption from registration set forth in Section 4(2) of the Securities Act
relating to sales by an issuer not involving any public offering. None of the
foregoing transactions involved a distribution or public offering. No
underwriters were engaged in connection with the foregoing issuances of
securities, and no underwriting commissions or discounts were paid.
 
ITEM 16. EXHIBITS AND FINANCIAL SCHEDULES
 
  (A) EXHIBITS
 
<TABLE>   
<CAPTION>
 EXHIBIT
   NO.                                DESCRIPTION
 -------                              -----------
 <C>     <S>
  1.1*   Underwriting Agreement
  3.1    Certificate of Incorporation of the Company, as amended
  3.2*   Proposed form of Amended and Restated Certificate of Incorporation of
          the Company to become effective immediately following the offering
  3.3**  By-Laws of the Company
  3.4**  Proposed form of Amended and Restated By-Laws
  4.1    Specimen certificate for the Common Stock of the Company
  5.1    Opinion of Foley, Hoag & Eliot llp
 10.1    1991 Registration Rights Agreement dated February 11, 1991, as
          amended, between the Company and the persons named therein
 10.2    Subordinated Note and Warrant Purchase Agreement dated as of August
          29, 1994 between the Company and the Purchasers named therein,
          including form of Subordinated 14% Promissory Notes and form of
          Common Stock Purchase Warrants
 10.3**  Form of Common Stock Purchase Warrants issued in August 1995
 10.4    Amended and Restated Credit Agreement dated as of June 18, 1996,
          between the Company and Silicon Valley Bank
 10.5    Settlement Agreement dated February 2, 1996 between the Company, BEB,
          Inc., BEB Limited Partnership I, BEB Limited Partnership II, BEB
          Limited Partnership III, BEB Limited Partnership IV, certain related
          parties and Brian Boyle
</TABLE>    
 
                                     II-3
<PAGE>
 
<TABLE>   
<CAPTION>
 EXHIBIT
   NO.                                 DESCRIPTION
 -------                               -----------
 <C>     <S>
 10.6**  1990 Incentive and Nonqualified Stock Option Plan
 10.7**  1996 Incentive and Non-Qualified Stock Option Plan
 10.8**  1996 Employee Stock Purchase Plan
 10.9*   Office Lease dated September 21, 1993, as amended, between the Company
          and L&E Investment of Massachusetts One, Inc.
 10.10*  Office Lease dated September 30, 1994, as amended, between the Company
          and Hobbs Brook Office Park
 10.11   Employment Agreement dated August 16, 1996 between the Company and
          Pamela D.A. Reeve
 10.12   Office Lease dated August 5, 1994, as amended, between the Company and
          L&E Investment of Massachusetts One, Inc.
 10.13   Letter Agreement, dated August 26, 1996, between the Company and Brian
          E. Boyle, including form of Common Stock Purchase Warrant and
          Registration Rights Agreement
 11.1    Statement re computation of per share earnings
 23.1    Consent of Deloitte & Touche llp
 23.2    Consent of Foley, Hoag & Eliot llp (included in Exhibit 5.1)
 24.1**  Power of Attorney (contained on the signature page of this
          Registration Statement)
 27**    Financial Data Schedules for year ended September 30, 1995 and three
          months ended December 31, 1995 and six months ended June 30, 1996.
</TABLE>    
- --------
   
*  Supersedes previously filed exhibit.     
** Previously filed.
 
  (B) FINANCIAL STATEMENT SCHEDULES. Financial statement schedules have been
omitted because they are inapplicable or the required information is shown in
the Financial Statements and the Notes thereto.
 
ITEM 17. UNDERTAKINGS.
 
  The undersigned registrant hereby undertakes to provide to the underwriters
at the closing specified in the underwriting agreement, certificates in such
denominations and registered in such names as required by the underwriters to
permit prompt delivery to each purchaser.
 
  Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the registrant of expenses
incurred or paid by a director, officer or controlling person of the
registrant in the successful defense of any action, suit or proceeding) is
asserted by such director, officer or controlling person in connection with
the securities being registered, the registrant will, unless in the opinion of
its counsel the matter has been settled by controlling precedent, submit to a
court of appropriate jurisdiction the question whether such indemnification by
it is against public policy as expressed in the Act and will be governed by
the final adjudication of such issue.
 
  The undersigned registrant hereby undertakes that:
 
    (1) For purposes of determining any liability under the Securities Act of
  1933, the information omitted from the form of prospectus filed as part of
  this registration statement in reliance upon Rule 430A and contained in a
  form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or
  (4) or 497(h) under the Securities Act shall be deemed to be part of this
  registration statement as of the time it was declared effective.
 
    (2) For the purpose of determining any liability under the Securities Act
  of 1933, each post-effective amendment that contains a form of prospectus
  shall be deemed to be a new registration statement relating to the
  securities offered therein, and the offering of such securities at that
  time shall be deemed to be the initial bona fide offering thereof.
 
                                     II-4
<PAGE>
 
                                   SIGNATURES
   
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE REGISTRANT
HAS DULY CAUSED THIS REGISTRATION STATEMENT TO BE SIGNED ON ITS BEHALF BY THE
UNDERSIGNED, THEREUNTO DULY AUTHORIZED, IN THE CITY OF WALTHAM, THE
COMMONWEALTH OF MASSACHUSETTS, ON AUGUST 27, 1996.     
 
                                         Lightbridge, Inc.
 
                                                  /s/ Pamela D. A. Reeve
                                         By: __________________________________
                                                   PAMELA D. A. REEVE
                                             PRESIDENT AND CHIEF EXECUTIVE
                                                        OFFICER
 
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS REGISTRATION
STATEMENT HAS BEEN SIGNED BELOW BY THE FOLLOWING PERSONS IN THE CAPACITIES AND
ON THE DATES INDICATED.
 
             SIGNATURE                       TITLE                 DATE
 
       /s/ Pamela D. A. Reeve         President, Chief          
- ------------------------------------   Executive Officer     August 27, 1996
         PAMELA D. A. REEVE            and Director                    
                                       (Principal
                                       Executive Officer)
 
                 *                    Chief Financial           
- ------------------------------------   Officer, Vice         August 27, 1996
          WILLIAM G. BROWN             President of                    
                                       Finance and
                                       Administration and
                                       Treasurer
                                       (Principal
                                       Financial and
                                       Accounting
                                       Officer)
 
                 *                    Director                  
- ------------------------------------                         August 27, 1996
          ANDREW I. FILLAT                                             
 
                 *                    Director                  
- ------------------------------------                         August 27, 1996
         TORRENCE C. HARDER                                            
 
                 *                    Director                  
- ------------------------------------                         August 27, 1996
        DOUGLAS A. KINGSLEY                                            
 
                 *                    Director                  
- ------------------------------------                         August 27, 1996
           D. QUINN MILLS                                              
 
       /s/ Pamela D.A. Reeve
*By: _______________________________
         PAMELA D.A. REEVE
          ATTORNEY-IN-FACT
 
                                      II-5
<PAGE>
 
                                 EXHIBIT INDEX
 
<TABLE>   
<CAPTION>
 EXHIBIT
   NO.                                 DESCRIPTION
 -------                               -----------
 <C>     <S>
  1.1*   Underwriting Agreement
  3.1    Certificate of Incorporation of the Company, as amended
  3.2*   Proposed form of Amended and Restated Certificate of Incorporation of
          the Company to become effective immediately following the offering
  3.3**  By-Laws of the Company
  3.4**  Proposed form of Amended and Restated By-Laws
  4.1    Specimen certificate for the Common Stock of the Company
  5.1    Opinion of Foley, Hoag & Eliot LLP
 10.1    1991 Registration Rights Agreement dated February 11, 1991, as
          amended, between the Company and the persons named therein
 10.2    Subordinated Note and Warrant Purchase Agreement dated as of August
          29, 1994 between the Company and the Purchasers named therein,
          including form of Subordinated 14% Promissory Notes and form of
          Common Stock Purchase Warrants
 10.3**  Form of Common Stock Purchase Warrants issued in August 1995
 10.4    Amended and Restated Credit Agreement dated as of June 18, 1996,
          between the Company and Silicon Valley Bank
 10.5    Settlement Agreement dated February 2, 1996 between the Company, BEB,
          Inc., BEB Limited Partnership I, BEB Limited Partnership II, BEB
          Limited Partnership III, BEB Limited Partnership IV, certain related
          parties and Brian Boyle
 10.6**  1990 Incentive and Nonqualified Stock Option Plan
 10.7**  1996 Incentive and Non-Qualified Stock Option Plan
 10.8**  1996 Employee Stock Purchase Plan
 10.9*   Office Lease dated September 21, 1993, as amended, between the Company
          and L&E Investment of Massachusetts One, Inc.
 10.10*  Office Lease dated September 30, 1994, as amended, between the Company
          and Hobbs Brook Office Park
 10.11   Employment Agreement dated August 16, 1996 between the Company and
          Pamela D.A. Reeve
 10.12   Office Lease dated August 5, 1994, as amended, between the Company and
          L&E Investment of Massachusetts One, Inc.
 10.13   Letter Agreement, dated August 26, 1996, between the Company and Brian
          E. Boyle, including form of Common Stock Purchase Warrant and
          Registration Rights Agreement
 11.1    Statement re computation of per share earnings
 23.1    Consent of Deloitte & Touche llp
 23.2    Consent of Foley, Hoag & Eliot llp (included in Exhibit 5.1)
 24.1**  Power of Attorney (contained on the signature page of this
          Registration Statement)
 27**    Financial Data Schedules for year ended September 30, 1995 and three
          months ended December 31, 1995 and March 31, 1996
</TABLE>    
- --------
   
*  Supersedes previously filed exhibit.     
** Previously filed.

<PAGE>
 
                                                                     EXHIBIT 1.1


                                                                         8/23/96
                              3,800,000 Shares/1/



                               Lightbridge, Inc.

                                  Common Stock

                             UNDERWRITING AGREEMENT
                             ----------------------
                                                             _____________, 1996

COWEN & COMPANY
Montgomery Securities
Prudential Securities Incorporated
     As Representatives of the Several Underwriters

c/o Cowen & Company
     Financial Square
    New York, New York 10005

 Dear Sirs:

     1.   Introductory.   Lightbridge, Inc., a Delaware corporation (the
          ------------                                                  
"Company"), and certain stockholders of the Company named in Schedule B hereto
(the "Selling Stockholders") propose to sell, pursuant to the terms of this
Agreement, to the several underwriters named in Schedule A hereto (the
"Underwriters," or, each, an "Underwriter"), an aggregate of 3,800,000 shares of
Common Stock, $.01 par value (the "Common Stock") of the Company, of which
__________ shares will be sold by the Company and ________ shares will be sold
by the Selling Stockholders.  The aggregate of 3,800,000 shares so proposed to
be sold is hereinafter referred to as the "Firm Stock." The respective amounts
of the Firm Stock to be so purchased by the several Underwriters are set forth
opposite their names in Schedule A hereto, and the respective amounts to be sold
by the Selling Stockholders are set forth opposite their names in Schedule B
hereto.  The Company and the Selling Stockholders also have granted to the

- ---------------------------

/1/________________________________

  Plus an option to purchase up to 570,000 additional shares from the Company to
  cover over-allotments.

                                      -1-
<PAGE>
 
Underwriters, upon the terms and conditions set forth in Section 3 hereof, up to
an additional 570,000 shares of Common Stock (the "Optional Stock"). The Firm
Stock and the Optional Stock are hereinafter collectively referred to as the
"Stock."  Cowen & Company ("Cowen"), Montgomery Securities and Prudential
Securities Incorporated are acting as representatives of the several
Underwriters and in such capacity are hereinafter referred to as the
"Representatives."

          2.  (a) Representations and Warranties of the Company.  The Company
                  ---------------------------------------------              
represents and warrants to, and agrees with, the several Underwriters that:

           (i) A registration statement on Form S-1 (File No. 333-6589) in the
         form in which it became or becomes effective and also in such form as
         it may be when any post-effective amendment thereto shall become
         effective with respect to the Stock, including any preeffective
         prospectuses included as part of the registration statement as
         originally filed or as part of any amendment or supplement thereto, or
         filed pursuant to Rule 424 under the Securities Act of 1933, as amended
         (the "Securities Act"), and the rules and regulations (the "Rules and
         Regulations") of the Securities and Exchange Commission (the
         "Commission") thereunder, copies of which have heretofore been
         delivered to you, has been carefully prepared by the Company in
         conformity with the requirements of the Securities Act and has been
         filed with the Commission under the Securities Act; one or more
         amendments to such registration statement, including in each case an
         amended preeffective prospectus, copies of which amendments have
         heretofore been delivered to you, have been so prepared and filed.  If
         it is contemplated, at the time this Agreement is executed, that a
         post-effective amendment to the registration statement will be filed
         and must be declared effective before the offering of the Stock may
         commence, the term "Registration Statement" as used in this Agreement
         means the registration statement as amended by said post-effective
         amendment.  The term "Registration Statement" as used in this Agreement
         shall also include any registration statement relating to the Stock
         that is filed and declared effective pursuant to Rule 462(b) under the
         Securities Act.  All copies of Registration Statements that have been
         delivered to you are identical to the electronically transmitted copies
         thereof filed with the Commission pursuant to the Commission's
         Electronic Data Gathering, Analysis and Retrieval System ("EDGAR"),
         except to the extent permitted by Regulation S-T.  The term
         "Prospectus" as used in this Agreement means the prospectus in the form
         included in the Registration Statement, or, (A) if the prospectus
         included in the Registration Statement omits information in reliance on
         Rule 430A under the Securities Act and such information is included in
         a prospectus filed with the Commission pursuant to Rule 424(b) under
         the Securities Act, the term "Prospectus" as used in this Agreement
         means the prospectus in the form included in the Registration Statement
         as supplemented by the addition of the Rule 430A information contained
         in the prospectus filed with the Commission pursuant to Rule 424 (b)
         and (B) if prospectuses that meet the requirements of Section 10(a) of

                                      -2-
<PAGE>
 
         the Securities Act are delivered pursuant to Rule 434 under the
         Securities Act, then (i) the term "Prospectus" as used in this
         Agreement means the "prospectus subject to completion" (as such term is
         defined in Rule 434 (g) under the Securities Act) as supplemented by
         (a) the addition of Rule 430A information or other information
         contained in the form of prospectus delivered pursuant to Rule 434 (b)
         (2) under the Securities Act or (b) the information contained in the
         term sheets described in Rule 434 (b) (3) under the Securities Act,
         (ii) the date of such prospectuses shall be deemed to be the date of
         the term sheets.  The term "Preeffective Prospectus" as used in this
         Agreement means the prospectus subject to completion in the form
         included in the Registration Statement at the time of the initial
         filing of the Registration Statement with the Commission, and as such
         prospectus shall have been amended from time to time prior to the date
         of the Prospectus.  For purposes of this Agreement, all references to
         the Registration Statement, any Preeffective Prospectus, the
         Prospectus, or any amendment or supplement to any of the foregoing
         shall be deemed to include the respective copies thereof filed with the
         Commission pursuant to EDGAR.

           (ii) The Commission has not issued or threatened to issue any order
         preventing or suspending the use of any Preeffective Prospectus, and,
         at its date of issue, each Preeffective Prospectus conformed in all
         material respects with the requirements of the Securities Act and did
         not include 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; and, when the Registration Statement becomes
         effective and at all times subsequent thereto up to and including the
         Closing Dates, the Registration Statement and the Prospectus and any
         amendments or supplements thereto contained and will contain all
         material statements and information required to be included therein by
         the Securities Act at the time of the filing thereof and conformed and
         will conform in all material respects to the requirements of the
         Securities Act and neither the Registration Statement nor the
         Prospectus, nor any amendment or supplement thereto, included or will
         include any untrue statement of a material fact or omitted or will 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; provided, however, that the
                                               --------  -------          
         foregoing representations, warranties and agreements shall not apply to
         information contained in or omitted from any Preeffective Prospectus or
         the Registration Statement or the Prospectus or any such amendment or
         supplement thereto in reliance upon, and in conformity with, written
         information furnished to the Company by or on behalf of any
         Underwriter, directly or through you (or by any Selling Stockholder),
         specifically for use in the preparation thereof; there is no franchise,
         lease, contract, agreement or document required to be described in the
         Registration Statement or Prospectus or to be filed as an exhibit to
         the Registration Statement which is not

                                      -3-
<PAGE>
 
         described or filed therein as required; and all descriptions of any
         such franchises, leases, contracts, agreements or documents contained
         in the Registration Statement are accurate descriptions of such
         documents in all material respects.

           (iii)  Subsequent to the respective dates as of which information is
         given in the Registration Statement and Prospectus, and except as set
         forth or contemplated in the Prospectus, the Company has not incurred
         any liabilities or obligations, direct or contingent, nor entered into
         any transactions, not in the ordinary course of business, and there has
         not been any material adverse change in the condition (financial or
         otherwise), properties, business, management, net worth or results of
         operations of the Company, or any change in the capital stock (except
         pursuant to stock plans and warrants described in the Registration
         Statement), or any material change in the short-term or long-term debt
         of the Company.

           (iv) The financial statements, together with the related notes, set
         forth in the Prospectus and elsewhere in the Registration Statement
         fairly present, on the basis stated in the Registration Statement, the
         financial position and the results of operations and changes in
         financial position of the Company at the respective dates or for the
         respective periods therein specified. Such statements and related notes
         and schedules have been prepared in accordance with generally accepted
         accounting principles applied on a consistent basis except as may be
         set forth in the Prospectus. The selected financial and statistical
         data set forth in the Prospectus under the caption "Selected Financial
         Data" fairly present, on the basis stated in the Registration
         Statement, the information set forth therein.

           (v) Deloitte & Touche LLP, who have expressed their opinions on the
         audited financial statements and related schedules included in the
         Registration Statement and the Prospectus are independent public
         accountants as required by the Securities Act and the Rules and
         Regulations.

           (vi) The Company has been duly organized and is validly existing and
         in good standing as a corporation under the laws of its jurisdiction of
         organization, with power and authority (corporate and other) to own or
         lease its business as described in the Prospectus; the Company is in
         possession of and operating in material compliance with all franchises,
         grants, authorizations, licenses, permits, easements, consents,
         certificates and orders required for the conduct of its business, all
         of which are valid and in full force and effect; and the Company is
         duly qualified to do business and in good standing as a foreign
         corporation in all other jurisdictions where its ownership or leasing
         of properties or the conduct of its business requires such
         qualification, except to the extent that the failure to be so qualified
         or be in good standing would not have a material adverse effect on the
         Company.  The Company has all requisite power and authority, and all
         necessary 

                                      -4-
<PAGE>
 
         consents, approvals, authorizations, orders, registrations,
         qualifications, licenses and permits of and from all public regulatory
         or governmental agencies and bodies to own, lease and operate its
         properties and conduct its business as now being conducted and as
         described in the Registration Statement and the Prospectus, and no such
         consent, approval, authorization, order, registration, qualification,
         license or permit contains a materially burdensome restriction not
         adequately disclosed in the Registration Statement and the Prospectus.
         THE COMPANY DOES NOT OWN OR CONTROL, DIRECTLY OR INDIRECTLY, ANY
         CORPORATION, ASSOCIATION OR OTHER ENTITY OTHER THAN BGX, INC.("BGX"),
         OF WHICH THE COMPANY HOLDS 50% OF THE OUTSTANDING CAPITAL STOCK. AS OF
         THE DATE HEREOF, BGX HAS NOT BEGUN OPERATIONS AND HAS NO REAL PROPERTY,
         PLACE OF BUSINESS, ASSETS, LIABILITIES, CUSTOMERS OR SUPPLIERS. THERE
         IS NO ACTION, SUIT, CLAIM, PROCEEDING OR INVESTIGATION PENDING OR
         THREATENED AGAINST OR AFFECTING BGX AND BGX IS NOT SUBJECT TO ANY
         ORDER, WRIT, INJUNCTION OR DECREE ENTERED IN ANY LAWSUIT OR PROCEEDING.
         BGX DOES NOT OWN, LICENSE OR HAVE ANY RIGHT TO ANY COPYRIGHTS, PATENTS,
         TRADEMARKS, SERVICE MARKS, TRADENAMES OR APPLICATIONS FOR THE SAME. BGX
         IS NOT A PARTY TO OR OTHERWISE BOUND BY ANY WRITTEN OR ORAL AGREEMENT,
         INSTRUMENT, COMMITMENT OR RESTRICTION.

           (vii)  The Company's authorized and outstanding capital stock is on
         the date hereof, and will be on the Closing Date, as set forth under
         the heading "Capitalization" in the Prospectus; the outstanding shares
         of capital stock (including the outstanding shares of Stock) of the
         Company conform to the description thereof in the Prospectus and have
         been duly authorized and validly issued and are fully paid and
         nonassessable, have been approved for quotation on the Nasdaq National
         Market and have been issued in compliance with all federal and state
         securities laws and were not issued in violation of or subject to any
         preemptive rights or similar rights to subscribe for or purchase
         securities and conform to the description thereof contained in the
         Prospectus.  Except as disclosed in and or contemplated by the
         Prospectus and the financial statements of the Company and related
         notes thereto included in the Prospectus, the Company does not have
         outstanding any options or warrants to purchase, or any preemptive
         rights or other rights to subscribe for or to purchase any securities
         or obligations convertible into, or any contracts or commitments to
         issue or sell, shares of its capital stock or any such options, rights,
         convertible securities or obligations, except for options granted
         subsequent to the date of information provided in the Prospectus
         pursuant to the Company's employee stock purchase and stock option
         plans as disclosed in the Prospectus.  The description of the Company'
         s stock option and other stock plans or arrangements, and the options
         or other rights granted or exercised thereunder, as set forth in the
         Prospectus, accurately and fairly presents the information required to
         be shown with respect to such plans, arrangements, options and rights.

                                      -5-
<PAGE>
 
           (viii)  The Stock to be issued and sold by the Company to the
         Underwriters hereunder has been duly and validly authorized and, when
         issued and delivered against payment therefor as provided herein, will
         be duly and validly issued, fully paid and nonassessable and free of
         any preemptive or similar rights and will conform to the description
         thereof in the Prospectus.

           (ix) Except as set forth in the Prospectus, there are no legal or
         governmental proceedings pending to which the Company or any executive
         officers or directors is a party or of which any property of the
         Company or any affiliate is subject, which, if determined adversely to
         the Company or any executive officers or directors, might individually
         or in the aggregate (i) prevent or adversely affect the transactions
         contemplated by this Agreement, (ii) suspend the effectiveness of the
         Registration Statement, (iii) prevent or suspend the use of the
         Preeffective Prospectus in any jurisdiction or (iv) result in a
         material adverse change in the condition (financial or otherwise),
         properties, business, management, net worth or results of operations of
         the Company; and to the best of the Company's knowledge no such
         proceedings are threatened or contemplated against the Company or any
         affiliate by governmental authorities or others.  The Company is not a
         party nor subject to the provisions of any material injunction,
         judgment, decree or order of any court, regulatory body or other
         governmental agency or body.  The description of the Company's
         litigation under the heading "Legal Proceedings" in the Prospectus is
         true and correct and complies with the Rules and Regulations.

           (x) The execution, delivery and performance of this Agreement and the
         consummation of the transactions herein contemplated will not result in
         a breach or violation of any of the terms or provisions of or
         constitute a default under any indenture, mortgage, deed of trust, note
         agreement or other material agreement or instrument to which the
         Company is a party or by which it or any of its properties is or may be
         bound, the Certificate of Incorporation, By-laws or other
         organizational documents of the Company, or any law, order, rule or
         regulation of any court or governmental agency or body having
         jurisdiction over the Company or any of its properties or will result
         in the creation of a lien.

           (xi) No consent, approval, authorization or order of any court or
         governmental agency or body is required for the consummation by the
         Company of the transactions contemplated by this Agreement, except such
         as may be required by the National Association of Securities Dealers,
         Inc. (the "NASD") or under the Securities Act or the securities or
         "Blue Sky" laws of any jurisdiction in connection with the purchase and
         distribution of the Stock by the Underwriters.

           (xii)  The Company has the full corporate power and authority to
         enter into this Agreement and to perform its obligations hereunder
         (including to

                                      -6-
<PAGE>
 
         issue, sell and deliver the Stock), and this Agreement has been duly
         and validly authorized, executed and delivered by the Company and is a
         valid and binding obligation of the Company, enforceable against the
         Company in accordance with its terms, except to the extent that rights
         to indemnity and contribution hereunder may be limited by federal or
         state securities laws or the public policy underlying such laws.

           (xiii)  The Company is in all material respects in compliance with,
         and conducts its business in material conformity with, all applicable
         federal, state, local and foreign laws, rules and regulations
         (including but not limited to the Foreign Corrupt Practices Act and any
         rules and regulations of the Federal Communications Commission) of any
         court or governmental agency or body and the Company has all material
         permits or licenses required thereunder; to the knowledge of the
         Company, otherwise than as set forth in the Registration Statement and
         the Prospectus, no prospective change in any of such federal or state
         laws, rules or regulations has been adopted which, when made effective,
         would have a material adverse effect on the operations of the Company.

           (xiv)  The Company has filed all necessary federal, state, local and
         foreign income, payroll, franchise and other tax returns and have paid
         all taxes shown as due thereon or with respect to any of its
         properties, and there is no tax deficiency that has been, or to the
         knowledge of the Company has been threatened or is likely to be,
         asserted against the Company or any of its properties or assets that
         would adversely affect the financial position, business or operations
         of the Company.

           (xv) No person or entity has the right to require registration of
         shares of Common Stock or other securities of the Company because of
         the filing or effectiveness of the Registration Statement or otherwise,
         except for persons and entities who have expressly waived such right or
         who have been given proper notice and have failed to exercise such
         right within the time or times required under the terms and conditions
         of such right.

           (xvi)  Neither the Company nor any of its officers or directors has
         taken or will take, directly or indirectly, any action designed or
         intended to stabilize or manipulate the price of any security of the
         Company, or which caused or resulted in, or which might in the future
         reasonably be expected to cause or result in, stabilization or
         manipulation of the price of the Common Stock of the Company.

           (xvii)  The Company has provided you with all financial statements
         since inception to the date hereof that are available to the officers
         of the Company,

                                      -7-
<PAGE>
 
         including financial statements for the three months ended December 31,
         1995 and the six months ended June 30, 1996.

           (xviii)  The Company owns, possesses, or has rights to use all
         patents, trademarks, trademark registrations, service marks, service
         mark registrations, tradenames, copyrights, licenses, inventions, trade
         secrets and rights described in the Prospectus as being owned or used
         by it or necessary for the conduct of its business, and the Company has
         not received notice of any claim to the contrary or any challenge by
         any other person to the rights of the Company with respect to the
         foregoing.  The Company's business as now conducted does not and will
         not infringe or conflict with in any material respect patents,
         trademarks, service marks, trade names, copyrights, trade secrets,
         licenses or other intellectual property or franchise right of any
         person.  No claim has been made against the Company alleging the
         infringement by the Company of any patent, trademark, service mark,
         tradename, copyright, trade secret, license in or other intellectual
         property right or franchise right of any person.

           (xix)  No breach or default exists in the due performance and
         observance by the Company of any term, covenant or condition of all
         contracts required by Item 601(b)(10) of Regulation S-K under the
         Securities Act to be filed as exhibits to the Registration Statement.
         To the Company's knowledge, no other party to such contract is in
         material default under or in breach of any such obligations. The
         Company has not received any notice of such default or breach.

           (xx) The Company is not involved in any labor dispute nor is any such
         dispute threatened.  The Company is not aware that (A) any executive,
         key employee or significant group of employees of the Company plans to
         terminate employment with the Company or (B) any such executive or key
         employee is subject to any noncompete, nondisclosure, confidentiality,
         employment, consulting or similar agreement that would be violated by
         the present or proposed business activities of the Company.  The
         Company does not have or expects to have any liability for any
         prohibited transaction or funding deficiency or any complete or partial
         withdrawal liability with respect to any pension, profit sharing or
         other plan which is subject to the Employee Retirement Income Security
         Act of 1974, as amended ("ERISA"), to which the Company makes or ever
         has made a contribution and in which any employee of the Company is or
         has ever been a participant.  With respect to such plans, the Company
         is in compliance in all material respects with all applicable
         provisions of ERISA.

           (xxi)  The Company has, and the Company as of the Closing Dates will
         have, good and marketable title in fee simple to all real property and
         good and marketable title to all personal property owned by it which is
         material to the

                                      -8-
<PAGE>
 
         business of the Company, in each case free and clear of all liens,
         encumbrances and defects except such as are described the Prospectus or
         such as would not have a material adverse effect on the Company; and
         any real property and buildings held under lease by the Company are, or
         will be as of the Closing Dates, held by it under valid, subsisting and
         enforceable leases with such exceptions as would not have a material
         adverse effect on the Company, in each case except as described in or
         contemplated by the Prospectus.

           (xxii)  The Company is insured by insurers of financial
         responsibility against such losses and risks and in such amounts as are
         customary in the business in which it is engaged; and no such insurer
         has notified or indicated to the Company that it will not be able to
         renew its existing insurance coverage as and when such coverage
         expires; and the Company has no reason to believe that, if such
         coverage is not renewed, that it will not be able to obtain similar
         coverage from similar insurers as may be necessary to continue its
         business at a cost that would not materially and adversely affect the
         condition, financial or otherwise, or the earnings, business or
         operations of the Company, except as described in or contemplated by
         the Prospectus.

           (xxiii)  Other than as contemplated by this Agreement, there is no
         broker, finder or other party that is entitled to receive from the
         Company any brokerage or finder's fee or other fee or commission as a
         result of any of the transactions contemplated by this Agreement.

           (xxiv)  The Company has complied with all provisions of Section
         517.075 Florida Statutes (Chapter 92-198; Laws of Florida).

           (xxv)  The Company maintains a system of internal accounting controls
         sufficient to provide reasonable assurances that (i) transactions are
         executed in accordance with management's general or specific
         authorization; (ii) transactions are recorded as necessary to permit
         preparation of financial statements in conformity with generally
         accepted accounting principles and to maintain accountability for
         assets; (iii) access to assets is permitted only in accordance with
         management's general or specific authorization; and (iv) the recorded
         accountability for assets is compared with existing assets at
         reasonable intervals and appropriate action is taken with respect to
         any differences.

           (xxvi)  To the Company's knowledge, neither the Company nor any
         employee or agent of the Company has made any payment or received or
         retained any payment in violation of any law, rule or regulation, which
         payment, receipt or retention of funds is of a character required to be
         disclosed in the Prospectus.

                                      -9-
<PAGE>
 
           (xxvii) The Company is not or will not  become an "investment
         company" or an entity "controlled" by an "investment company" as such
         terms are defined in the Investment Company Act of 1940, as amended,
         after the closing of the offering and the application of the proceeds
         therefrom.

           (xxiii)  Each certificate signed by any officer of the Company and
         delivered to the Underwriters or counsel for the Underwriters shall be
         deemed to be a representation and warranty by the Company as to the
         matters covered thereby.

           (xxiv)  The Company has obtained the written agreement described in
         Section 8 (k) of this Agreement from each of its officers, directors
         and holders of Common Stock.

          (b) Representations and Warranties and Agreements of the Selling
              ------------------------------------------------------------
Stockholders.  Each Selling Stockholder represents, severally and not jointly,
- -------------                                                                 
and warrants to, and agrees with, the several Underwriters that such Selling
Stockholder:

           (i) Now has, and on the Closing Dates will have, valid and marketable
         title to the Stock to be sold by such Selling Stockholder, free and
         clear of any lien, claim, security interest or other encumbrance,
         including, without limitation, any restriction on transfer, and has
         full right, power and authority to enter into this Agreement, the Power
         of Attorney and the Custody Agreement (each as hereinafter defined),
         and, to the extent such Selling Stockholder is a corporation, has been
         duly organized and is validly existing and in good standing as a
         corporation under the laws of its jurisdiction of organization.

           (ii) Now has, and on the Closing Dates will have, upon delivery of
         and payment for each share of Stock hereunder, full right, power and
         authority and any approval required by law to sell, transfer, assign
         and deliver the Stock being sold by such Selling Stockholder hereunder,
         and each of the several Underwriters will acquire valid and marketable
         title to all of the Stock being sold to the Underwriters by such
         Selling Stockholder, free and clear of any liens, encumbrances,
         equities claims, restrictions on transfer or other defects whatsoever.

           (iii)  For a period of 180 days after the date of this Agreement,
         without the prior written consent of Cowen, such Selling Stockholder
         will not offer, sell, assign, transfer, encumber, contract to sell,
         grant an option to purchase or otherwise dispose of any shares of
         Common Stock held by such Selling Stockholder (including without
         limitation any shares of Common Stock that may be deemed to be
         beneficially owned by such Selling Stockholder on the date hereof in
         accordance with the Rules and Regulations) or any securities
         convertible into, derivative of or exercisable or exchangeable for such
         Common Stock for 180 days commencing on

                                      -10-
<PAGE>
 
         the date of the final prospectus, except for (i) shares of Common Stock
         sold by such Selling Stockholder pursuant to this Agreement, if any,
         (ii) shares of Common Stock purchased by such Selling Stockholder in
         the public market pursuant to brokers' transactions, (iii) shares of
         Common Stock sold to the Company or the entities on Schedule D, and
         (iv) distributions of Common Stock to limited partners or shareholders
         of such Selling Stockholder provided that the distributees thereof
         agree in writing to be bound by the terms of this restriction.

           (iv) Has duly executed and delivered a power of attorney, in
         substantially the form heretofore delivered by the Representatives (the
         "Power of Attorney"), appointing Pamela D.A. Reeve and William G.
         Brown, and each of them, as attorney-in-fact (the "Attorneys-in-fact")
         with authority to execute and deliver this Agreement on behalf of such
         Selling Stockholder, to authorize the delivery of the shares of Stock
         to be sold by such Selling Stockholder hereunder and otherwise to act
         on behalf of such Selling Stockholder in connection with the
         transactions contemplated by this Agreement.

           (v) Has duly executed and delivered a custody agreement, in
         substantially the form heretofore delivered by the Representatives (the
         "Custody Agreement"), with the Company as custodian (the "Custodian"),
         pursuant to which certificates in negotiable form for the shares of
         Stock to be sold by such Selling Stockholder hereunder have been placed
         in custody for delivery under this Agreement.

           (vi) Has, by execution and delivery of each of this Agreement, the
         Power of Attorney and the Custody Agreement, created valid and binding
         obligations of such Selling Stockholder, enforceable against such
         Selling Stockholder in accordance with the terms of such agreements and
         documents, except to the extent that rights to indemnity hereunder may
         be limited by federal or state securities laws or the public policy
         underlying such laws.

           (vii)  The performance of this Agreement, the Custody Agreement and
         the Power of Attorney, and the consummation of the transactions
         contemplated hereby and thereby will not result in a breach or
         violation by such Selling Stockholder of any of the terms or provisions
         of, or constitute a default by such Selling Stockholder under, any
         indenture, mortgage, deed of trust, trust (constructive or other), loan
         agreement, lease, franchise, license or other agreement or instrument
         to which such Selling Stockholder is a party or by which such Selling
         Stockholder or any of its properties is bound, or any judgment of any
         court or governmental agency or body applicable to such Selling
         Stockholder or any of its properties, or to such Selling Stockholder's
         knowledge, any statute, decree, order, 

                                      -11-
<PAGE>
 
         rule or regulation of any court or governmental agency or body
         applicable to such Selling Stockholder or any of its properties.

           (viii)  Has reviewed the Registration Statement and Prospectus and,
         although such Selling Stockholder has not independently verified the
         accuracy or completeness of all the information contained therein,
         nothing has come to the attention of such Selling Stockholder that
         would lead such Selling Stockholder to believe that on the Effective
         Date, the Registration Statement contained any untrue statement of a
         material fact or omitted to state any material fact required to be
         stated therein or necessary in order to make the statements therein not
         misleading; and, on the Effective Date the Prospectus contained and, on
         the Closing Date and any later date on which Optional Stock is to be
         purchased, contains any untrue statement of a material fact or omitted
         or omits to state any material fact necessary in order to make the
         statements therein, in the light of the circumstances under which they
         were made, not misleading.

         Each Selling Stockholder agrees that the shares of Stock represented by
         the certificates held in custody under the Custody Agreement are for
         the benefit of and coupled with and subject to the interests of the
         Underwriters, the other Selling Stockholders and the Company hereunder,
         and that the arrangement for such custody and the appointment of the
         Attorneys-in-fact are irrevocable; that the obligations of such Selling
         Stockholder hereunder shall not be terminated by operation of law,
         whether by the death or incapacity, liquidation or distribution of such
         Selling Stockholder, or any other event, that if such Selling
         Stockholder should die or become incapacitated or is liquidated or
         dissolved or any other event occurs, before the delivery of the Stock
         hereunder, certificates for the Stock to be sold by such Selling
         Stockholder shall be delivered on behalf of such Selling Stockholder in
         accordance with the terms and conditions of this Agreement and the
         Custody Agreement, and action taken by the Attorneys-in-fact or any of
         them under the Power of Attorney shall be as valid as if such death,
         incapacity, liquidation or dissolution or other event had not occurred,
         whether or not the Custodian, the Attorneys-in-fact or any of them
         shall have notice of such death, incapacity, liquidation or dissolution
         or other event.

          3.  Purchase by, and Sale and Delivery to, Underwriters -- Closing
              --------------------------------------------------------------
Dates.  The Company and the Selling Stockholders agree, severally and not
- -----                                                                    
jointly, to sell to the Underwriters the Firm Stock with the number of shares to
be sold by the Company and each Selling Shareholder being the number of Shares
set opposite his, her or its name in Schedule B and on the basis of the
representations, warranties, covenants and agreements herein contained, but
subject to the terms and conditions herein set forth, the Underwriters agree,
severally and not jointly, to purchase the Firm Stock from the Company and the
Selling Stockholders, the number of shares of Firm Stock to be purchased by each
Underwriter being set opposite its name in Schedule A, 

                                      -12-
<PAGE>
 
subject to adjustment in accordance with Section 12 hereof. The number of shares
of Stock to be purchased by each Underwriter from each Selling Stockholder
hereunder shall bear the same proportion to the total number of shares of Stock
to be purchased by such Underwriter hereunder as the number of shares of stock
being sold by each Selling Stockholder bears to the total number of shares of
Stock being sold by all Selling Stockholders, subject to adjustment by the
Representatives to eliminate fractions.

          The purchase price per share to be paid by the Underwriters to the
Company and the Selling Stockholders will be $ _____ per share (the "Purchase
Price").

          The Company and the Selling Stockholders will deliver the Firm Stock
to the Representatives for the respective accounts of the several Underwriters
in the form of definitive certificates, issued in such names and in such
denominations as the Representatives may direct by notice in writing to the
Company given at or prior to 12:00 Noon, New York Time, on the second full
business day preceding the First Closing Date (as defined below) or, if no such
direction is received, in the names of the respective Underwriters or in such
other names as Cowen may designate (solely for the purpose of administrative
convenience) and in such denominations as Cowen may determine, against payment
of the aggregate Purchase Price therefor by wire transfer (same day funds),
payable to the order of the Company, all at the offices of Foley, Hoag & Eliot
LLP, One Post Office Square, Boston, Massachusetts 02109.  The time and date of
the delivery and closing shall be at 10:00 A.M., New York Time, on ___________,
1996, in accordance with Rule 15c6-1 of the Exchange Act.  The time and date of
such payment and delivery are herein referred to as the "First Closing Date".
The Closing Date and the location of delivery of, and the form of payment for,
the Firm Stock may be varied by agreement between the Company and Cowen.  The
Closing Date may be postponed pursuant to the provisions of Section 12.

          The Company and the Selling Stockholders shall make the certificates
for the Stock available to the Representatives for examination on behalf of the
Underwriters not later than 10:00 A.M., New York Time, on the business day
preceding the Closing Date at the offices of Cowen & Company, Financial Square,
New York, New York 10005.

          It is understood that Cowen, Montgomery Securities or Prudential
Securities Incorporated, individually and not as Representatives of the several
Underwriters, may (but shall not be obligated to) make payment to the Company on
behalf of any Underwriter or Underwriters, for the Stock to be purchased by such
Underwriter or Underwriters.  Any such payment by Cowen, Montgomery Securities
or Prudential Securities Incorporated shall not relieve such Underwriter or
Underwriters from any of its or their other obligations hereunder.

          The several Underwriters agree to make an initial public offering of
the Firm Stock at the initial public offering price as soon after the
effectiveness of the Registration Statement as in their judgment is advisable.
The Representatives shall promptly advise the Company and the Selling
Stockholders of the making of the initial public offering.

                                      -13-
<PAGE>
 
          For the purpose of covering any over-allotments in connection with the
distribution and sale of the Firm Stock as contemplated by the Prospectus, the
Company and each of the Selling Stockholders hereby grants to the Underwriters
an option to purchase, severally and not jointly, up to the aggregate number of
shares of Optional Stock set forth opposite the Company's and each such Selling
Stockholder's name on Schedule B hereto, for an aggregate of up to
______________ shares.  The price per share to be paid for the Optional Stock
shall be the Purchase Price.  The option granted hereby may be exercised as to
all or any part of the Optional Stock at any time, and from time to time, not
more than thirty (30) days subsequent to the effective date of this Agreement.
No Optional Stock shall be sold and delivered unless the Firm Stock previously
has been, or simultaneously is, sold and delivered.  The right to purchase the
Optional Stock or any portion thereof may be surrendered and terminated at any
time upon notice by the Underwriters to the Company and the Selling
Stockholders.

          The option granted hereby may be exercised by the Underwriters by
giving written notice from Cowen to the Company and the Selling Stockholders
setting forth the number of shares of the Optional Stock to be purchased by them
and the date and time for delivery of and payment for the Optional Stock.  Each
date and time for delivery of and payment for the Optional Stock (which may be
the First Closing Date, but not earlier) is herein called the "Option Closing
Date" and shall in no event be earlier than two (2) business days nor later than
ten (10) business days after written notice is given. (The Option Closing Date
and the First Closing Date are herein called the "Closing Dates").   All
purchases of Optional Stock shall be made first from the Company and then the
Selling Stockholders on a pro rata basis.  Optional Stock shall be purchased for
the account of each Underwriter in the same proportion as the number of shares
of Firm Stock set forth opposite such Underwriter's name in Schedule B hereto
bears to the total number of shares of Firm Stock (subject to adjustment by the
Underwriters to eliminate odd lots).  Upon exercise of the option by the
Underwriters, the Company and the Selling Stockholders agree to sell to the
Underwriters the number of shares of Optional Stock set forth in the written
notice of exercise and the Underwriters agree, severally and not jointly and
subject to the terms and conditions herein set forth, to purchase the number of
such shares determined as aforesaid.

          The Company and the Selling Stockholders will deliver the Optional
Stock to the Underwriters in the form of definitive certificates, issued in such
names and in such denominations as the Representatives may direct by notice in
writing to the Company and the Selling Stockholders given at or prior to 12:00
Noon, New York Time, on the second full business day preceding the Option
Closing Date or, if no such direction is received, in the names of the
respective Underwriters or in such other names as Cowen may designate (solely
for the purpose of administrative convenience) and in such denominations as
Cowen may determine, against payment of the aggregate Purchase Price therefor by
wire transfer (same day funds), payable to the order of the Company and the
Company as Custodian for the Selling Stockholders or payable as directed by the
Company and such Custodian all at the offices of Foley, Hoag & Eliot LLP, One
Post Office Square, Boston, Massachusetts 02109.  The Company and the Selling

                                      -14-
<PAGE>
 
Stockholders shall make the certificates for the Optional Stock available to the
Underwriters for examination not later than 10:00 A.M., New York Time, on the
business day preceding the Option Closing Date at the offices of Cowen &
Company, Financial Square, New York, New York 10005. The Option Closing Date and
the location of delivery of, and the form of payment for, the Option Stock may
be varied by agreement between the Company, the Custodian for the Selling
Stockholders and Cowen.  The Option Closing Date may be postponed pursuant to
the provisions of Section 12.

          4.  Covenants and Agreements of the Company.  The Company covenants
              ---------------------------------------                        
and agrees with the several Underwriters that:

          (a) The Company will (i) if the Company and the Representatives have
     determined not to proceed pursuant to Rule 430A, use its best efforts to
     cause the Registration Statement to become effective, (ii) if the Company
     and the Representatives have determined to proceed pursuant to Rule 430A,
     use its best efforts to comply with the provisions of and make all
     requisite filings with the Commission pursuant to Rule 430A and Rule 424 of
     the Rules and Regulations and (iii) if the Company and the Representatives
     have determined to deliver Prospectuses pursuant to Rule 434 of the Rules
     and Regulations, to use its best efforts to comply with all the applicable
     provisions thereof.  The Company will advise the Representatives promptly
     as to the time at which the Registration Statement becomes effective, will
     advise the Representatives promptly of the issuance by the Commission of
     any stop order suspending the effectiveness of the Registration Statement
     or of the institution of any proceedings for that purpose, and will use its
     best efforts to prevent the issuance of any such stop order and to obtain
     as soon as possible the lifting thereof, if issued.  The Company will
     advise the Representatives promptly of the receipt of any comments of the
     Commission or any request by the Commission for any amendment of or
     supplement to the Registration Statement or the Prospectus or for
     additional information and will not at any time file any amendment to the
     Registration Statement or supplement to the Prospectus which shall not
     previously have been submitted to the Representatives a reasonable time
     prior to the proposed filing thereof or which the Representatives shall not
     have previously approved in writing (such approval not to be unreasonably
     withheld or delayed) or which is not in compliance with the Securities Act
     and the Rules and Regulations.

          (b) The Company will prepare and file with the Commission, promptly
     upon the request of the Representatives, any amendments or supplements to
     the Registration Statement or the Prospectus which in the opinion of the
     Representatives may be necessary to enable the several Underwriters to
     continue the distribution of the Stock and will use its best efforts to
     cause the same to become effective as promptly as possible.

          (c) If at any time after the effective date of the Registration
     Statement when a prospectus relating to the Stock is required to be
     delivered under the Securities Act any

                                      -15-
<PAGE>
 
     event relating to or affecting the Company occurs as a result of which the
     Prospectus or any other prospectus as then in effect would include an
     untrue statement of a material fact, or omit to state any material fact
     necessary to make the statements therein, in light of the circumstances
     under which they were made, not misleading, or if it is necessary at any
     time to amend the Prospectus to comply with the Securities Act, the Company
     will promptly notify the Representatives thereof and will prepare an
     amended or supplemented prospectus which will correct such statement or
     omission; and in case any Underwriter is required to deliver a prospectus
     relating to the Stock nine (9) months or more after the effective date of
     the Registration Statement, the Company upon the request of the
     Representatives and at the expense of such Underwriter will prepare
     promptly such prospectus or prospectuses as may be necessary to permit
     compliance with the requirements of Section 10(a)(3) of the Securities Act.

          (d) The Company will deliver to the Representatives, at or before the
     Closing Dates, signed copies of the Registration Statement, as originally
     filed with the Commission, and all amendments thereto including all
     financial statements and exhibits thereto, and will deliver to the
     Representatives such number of copies of the Registration Statement,
     including such financial statements, but without exhibits, and all
     amendments thereto, as the Representatives may reasonably request.  The
     Company will deliver or mail to or upon the order of the Representatives,
     from time to time until the effective date of the Registration Statement,
     as many copies of the Preeffective Prospectus as the Representatives may
     reasonably request.  The Company will deliver or mail to or upon the order
     of the Representatives on the date of the initial public offering, and
     thereafter from time to time during the period when delivery of a
     prospectus relating to the Stock is required under the Securities Act, as
     many copies of the Prospectus, in final form or as thereafter amended or
     supplemented as the Representatives may reasonably request; provided,
                                                                 -------- 
     however, that the expense of the preparation and delivery of any prospectus
     -------                                                                    
     required for use nine (9) months or more after the effective date of the
     Registration Statement shall be borne by the Underwriters required to
     deliver such prospectus.

          (e) The Company will make generally available to its Stockholders as
     soon as practicable, but not later than fifteen (15) months after the
     effective date of the Registration Statement, an earnings statement which
     will be in reasonable detail (but which need not be audited) and which will
     comply with Section 11(a) of the Securities Act, covering a period of at
     least twelve (12) months beginning after the "effective date" (as defined
     in Rule 158 under the Securities Act) of the Registration Statement.

          (f) The Company will cooperate with the Representatives to enable the
     Stock to be registered or qualified for offering and sale by the
     Underwriters and by dealers under the securities laws of such jurisdictions
     as the Representatives may designate, provided that such jurisdictions are
     within the United States, Guam or Puerto Rico, and at the request of the
     Representatives will make such applications and furnish such consents to

                                      -16-
<PAGE>
 
     service of process or other documents as may be required of it as the
     issuer of the Stock for that purpose; provided, however, that the Company
                                           --------  -------                  
     shall not be required to qualify to do business or to file a general
     consent (other than that arising out of the offering or sale of the Stock)
     to service of process in any such jurisdiction where it is not now so
     subject.  The Company will, from time to time, prepare and file such
     statements and reports as are or may be required of it as the issuer of the
     Stock to continue such qualifications in effect for so long a period as the
     Representatives may reasonably request for the distribution of the Stock.
     The Company will advise the Representatives promptly after the Company
     becomes aware of the suspension of the qualifications or registration of
     (or any such exception relating to) the Common Stock of the Company for
     offering, sale or trading in any jurisdiction or of any initiation or
     threat of any proceeding for any such purpose, and in the event of the
     issuance of any orders suspending such qualifications, registration or
     exception, the Company will, with the cooperation of the Representatives
     use its best efforts to obtain the withdrawal thereof.

          (g) The Company will furnish to its stockholders annual reports
     containing financial statements certified by independent public accountants
     and with quarterly summary financial information in reasonable detail which
     may be unaudited.

          (h) The Company will use its best efforts to list the Stock on the
     Nasdaq National Market.

          (i) The Company will maintain a transfer agent and registrar for its
     Common Stock.

          (j) Prior to filing its first six quarterly statements on Form 10-Q,
     the Company will have its independent auditors perform a limited quarterly
     review of its quarterly numbers.

          (k) The Company will not offer, sell, assign, transfer, encumber,
     contract to sell, grant an option to purchase or otherwise dispose of any
     shares of Common Stock or securities convertible into or exercisable or
     exchangeable for Common Stock (including, without limitation, Common Stock
     of the Company which may be deemed to be beneficially owned by the Company
     in accordance with the Rules and Regulations) during the 180 days following
     the date on which the price of the Common Stock to be purchased by the
     Underwriters is set (except with prior written consent of each of the
     Representatives), other than the Company's sale of Common Stock hereunder
     and the Company's issuance of Common Stock upon the exercise of warrants
     and stock options which are presently outstanding and described in the
     Prospectus or pursuant to the Company's employee stock purchase and stock
     option plans.

                                      -17-
<PAGE>
 
          (l) The Company will apply the net proceeds from the sale of the Stock
     as set forth in the description under "Use of Proceeds" in the Prospectus
     which description complies in all material respects with the requirements
     of Item 504 of Regulation S-K.

          (m) The Company will supply you with copies of all correspondence to
     and from, and all documents issued to and by, the Commission in connection
     with the registration of the Stock under the Securities Act and the
     Exchange Act.

          (n) Prior to the Closing Dates, the Company will furnish to you, as
     soon as they have been prepared, copies of any unaudited interim financial
     statements of the Company for any periods subsequent to the periods covered
     by the financial statements appearing in the Registration Statement and the
     Prospectus.

          (o) Prior to the First Closing Date, the Company will issue no press
     release or other communications directly or indirectly and hold no press
     conference with respect to the Company, its financial condition, results of
     operation, business, prospects, assets or liabilities, or the offering of
     the Stock, without your prior written consent.  For a period of twelve (12)
     months following the Closing Date, the Company will use its best efforts to
     provide to you copies of each press release or other public communications
     with respect to the financial condition, results of operations, business,
     prospects, assets or liabilities of the Company at least twenty-four (24)
     hours prior to the public issuance thereof or such longer advance period as
     may reasonably be practicable.

          (p) During the period of five (5) years hereafter, the Company will
     furnish to the Representatives, and upon request of the Representatives, to
     each of the Underwriters:  (i) as soon as practicable after the end of each
     fiscal year, copies of the Annual Report of the Company containing the
     balance sheet of the Company as of the close of such fiscal year and
     statements of income, stockholder's equity and cash flows for the year then
     ended and the opinion thereon of the Company's independent public
     accountants; (ii) as soon as practicable after the filing thereof, copies
     of each proxy statement, Annual Report on Form 10-K, Quarterly Report on
     Form 10-Q, Current Report on Form 8-K or other report filed by the Company
     with the Commission, or the NASD or any securities exchange; and (iii) as
     soon as available, copies of any report or communication of the Company
     mailed generally to holders of its Common Stock and (iv) from time to time,
     such other information concerning the Company as you may reasonably
     request.

          (Q) THE COMPANY HAS NOT DISTRIBUTED AND, PRIOR TO THE LATER OF (I) THE
     CLOSING DATE AND (II) THE COMPLETION OF THE DISTRIBUTION OF THE STOCK, WILL
     NOT DISTRIBUTE ANY OFFERING MATERIAL IN CONNECTION WITH THE OFFERING AND
     SALE OF THE STOCK OTHER THAN THE REGISTRATION STATEMENT OR ANY AMENDMENT
     THERETO, ANY PRELIMINARY PROSPECTUS OR THE PROSPECTUS OR ANY AMENDMENT OR
     SUPPLEMENT THERETO, OR OTHER MATERIALS, IF ANY PERMITTED BY THE ACT.

                                      -18-
<PAGE>
 
          5.  Payment of Expenses.  (a) The Company will pay (directly or by
              -------------------                                           
reimbursement) all costs, fees and expenses incurred in connection with or
incident to the performance of the obligations of the Company and of the Selling
Stockholders under this Agreement and in connection with the transactions
contemplated hereby, including but not limited to (i) all expenses and taxes
incident to the issuance and delivery of the Stock to the Representatives; (ii)
all expenses incident to the registration of the Stock under the Securities Act;
(iii) the costs of preparing stock certificates (including printing and
engraving costs); (iv) all fees and expenses of the registrar and transfer agent
of the Stock; (v) all necessary issue, transfer and other stamp taxes in
connection with the issuance and sale of the Stock to the Underwriters; (vi)
fees and expenses of the Company's counsel and the Company's independent
accountants; (vii) all costs and expenses incurred in connection with the
preparation, printing, filing, shipping and distribution of the Registration
Statement, each Preeffective Prospectus and the Prospectus (including all
exhibits and financial statements) and all amendments and supplements provided
for herein, the Selling Stockholders' Powers of Attorney, the Custody
Agreements, the "Agreement Among Underwriters" between the Representatives and
the Underwriters, the Master Selected Dealers' Agreement, the Underwriters'
Questionnaire and the Blue Sky memoranda and this Agreement; (viii) all filing
fees, attorneys fees' and expenses incurred by the Company or the Underwriters
in connection with exemptions from the qualifying or registering (or obtaining
qualification or registration of) all or any part of the Stock for offer and
sale and determination of its eligibility for investment under the Blue Sky or
other securities laws of such jurisdictions as the Representatives may
designate; (ix) all fees and expenses paid or incurred in connection with
filings made with the NASD; and (x) all other reasonable costs and expenses
incident to the performance of their obligations hereunder which are not
otherwise specifically provided for in this Section.

          (b) Each Selling Stockholder will pay (directly or by reimbursement)
all fees and expenses incident to the performance of such Selling Stockholder's
obligations under this Agreement which are not otherwise specifically provided
for herein, including but not limited to any fees and expenses of counsel for
such Selling Stockholder, such Selling Stockholder's pro rata share of fees and
expenses of the Attorneys-in-fact and the Custodian and all expenses and taxes
incident to the sale and delivery of the Stock to be sold by such Selling
Stockholder to the Underwriters hereunder.

          (c) In addition to their other obligations under Section 6(a) and (b)
hereof, but subject to the provisions of this Section 6(c) and Section 6(e)
hereof, the Company and the Selling Stockholders agree that, as an interim
measure during the pendency of any claim, action, investigation, inquiry or
other proceeding arising out of or based upon (i) any misstatement or omission
or any alleged misstatement or omission or (ii) any breach or inaccuracy in
their representations and warranties, they will reimburse each Underwriter on a
quarterly basis for all reasonable legal or other expenses incurred in
connection with investigating or defending any such claim, action,
investigation, inquiry or other proceeding, notwithstanding the absence of a
judicial

                                      -19-
<PAGE>
 
determination as to the propriety and enforceability of the Company's
and Selling Stockholders' obligation to reimburse each Underwriter for such
expenses and the possibility that such payments might later be held to have been
improper by a court of competent jurisdiction.  To the extent that any such
interim reimbursement payment is so held to have been improper, each Underwriter
shall promptly return it to the Company or the Selling Stockholder, as the case
maybe, together with interest, compounded daily, determined on the basis of the
prime rate (or other commercial lending rate for borrowers of the highest credit
standing) announced from time to timed by Chemical Bank, New York, New York (the
"Prime Rate").  Any such interim reimbursement payments which are not made to an
Underwriter in a timely manner as provided below shall bear interest at the
Prime Rate from the due date for such reimbursement.  This expense reimbursement
agreement will be in addition to any other liability which the Company and the
Selling Stockholders may otherwise have.  The request for reimbursement will be
sent to the Company with a copy to each Selling Stockholder.  In the event that
the Company fails to make such reimbursement payment and the Underwriters have
exhausted their remedies against the Company for such payments, the
Representatives shall notify the Selling Stockholders of their obligation to
make such reimbursement payments within fifteen (15) days; provided, however,
that each Selling Stockholder shall be required to advance at such time only its
pro rata portion of the reimbursement payment.  To the extent that any Selling
Stockholder fails to pay its pro rata portion in timely response to the
Underwriters' request, the other Selling Stockholders shall be jointly and
severally liable for such reimbursement payment and each shall render such
payment to the Representatives within fifteen (15) days of written demand
therefor by the Representatives.

          (d) In addition to its other obligations under Section 6(c) hereof,
each Underwriter severally agrees that, as an interim measure during the
pendency of any claim, action, investigation, inquiry or other proceeding
arising out of or based upon any misstatement or omission of a material fact, or
any alleged misstatement or omission of a material fact, described in Section
6(c) hereof which relates to information furnished by the Underwriters to the
Company, directly or through the Representatives, it will reimburse the Company
(and, to the extent applicable, each officer, director, or controlling person or
Selling Stockholder) on a quarterly basis for all reasonable legal or other
expenses incurred in connection with investigating or defending any such claim,
action, investigation, inquiry or other proceeding, notwithstanding the absence
of a judicial determination as to the propriety and enforceability of the
Underwriters' obligation to reimburse the Company (and, to the extent
applicable, each officer, director, or controlling person or Selling
Stockholder) for such expenses and the possibility that such payments might
later be held to have been improper by a court of competent jurisdiction.  To
the extent that any such interim reimbursement payment is so held to have been
improper, the Company (and, to the extent applicable, each officer, director, or
controlling person or Selling Stockholder) shall promptly return it to the
Underwriters together with interest, compounded daily, determined on the basis
of the Prime Rate.  Any such interim reimbursement payments which are not made
to the Company within thirty (30) days of a request for reimbursement shall bear
interest at the Prime Rate from the date of such request.  This indemnity
agreement will be in addition to any liability which such Underwriter may
otherwise have.

                                      -20-
<PAGE>
 
          (e) It is agreed that any controversy arising out of the operation of
the interim reimbursement arrangements set forth in paragraph (c) and/or (d) of
this Section 5, including the amounts of any requested reimbursement payments
and the method of determining such amounts, shall be settled by arbitration
conducted under the provisions of and pursuant to the arbitration procedures of
the National Association of Securities Dealers, Inc.  Any such arbitration must
be commenced by service of a written demand for arbitration or written notice of
intention to arbitrate, therein electing the arbitration tribunal.  In the event
the party demanding arbitration does not make such designation of an arbitration
tribunal in such demand or notice, then the party responding to said demand or
notice is authorized to do so.  Such an arbitration would be limited to the
operation of the interim reimbursement provisions contained in paragraph (c)
and/or (d) of this Section 5 and would not resolve the ultimate propriety or
enforceability of the obligation to reimburse expenses which is created by the
provisions of Section 6.

          6.  Indemnification and Contribution.  (a) The Company agrees to
              --------------------------------                            
indemnify and hold harmless each Underwriter and each person, if any, who
controls such Underwriter within the meaning of the Securities Act and the
respective officers, directors, shareholders, partners and employees of each of
such Underwriter or person who controls such Underwriter (collectively, the
"Underwriter Indemnified Parties" and, each, an "Underwriter Indemnified
Party"), against any losses, claims, damages, liabilities or expenses
(including, unless the Company elects to assume the defense, the reasonable cost
of investigating and defending against any claims therefor and counsel fees
incurred in connection therewith), joint or several, which may be based upon the
Securities Act, the Exchange Act or any other statute or at common law, on the
ground or alleged ground that any Preeffective Prospectus, the Registration
Statement or the Prospectus (or any Preeffective Prospectus, the Registration
Statement or the Prospectus as from time to time amended or supplemented)
includes an untrue statement of a material fact or omits to state a material
fact required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading, unless such statement or omission was made in reliance upon, and in
conformity with, written information furnished to the Company by any
Underwriter, directly or through the Representatives, specifically for use in
the preparation thereof; provided, that with respect to any untrue statement or
omission or alleged untrue statement or omission made in any Registration
Statement, the indemnity agreement contained in this subsection (a) shall not
inure to the benefit of any Underwriter Indemnified Party from whom the person
asserting any such losses, claims, damages or liabilities purchased the shares
of Stock concerned to the extent that any such loss, claim, damage or liability
of such Underwriter Indemnified Party results from the fact that a copy of the
Prospectus was not sent or given to such person at or prior to the written
confirmation of the sale of such shares of Stock to such person as required by
the Securities Act and if the untrue statement or omission concerned has been
corrected in the Prospectus; provided, however, that in no case is the Company
to be liable with respect to any claims made against any Underwriter Indemnified
Party against whom the action is brought unless such Underwriter Indemnified
Party shall have notified the Company in writing within a reasonable time after
the summons or other first legal process giving

                                      -21-
<PAGE>
 
information of the nature of the claim served upon the Underwriter Indemnified
Party, but failure to notify the Company of such claim shall not relieve it from
any liability which it may have to any Underwriter Indemnified Party otherwise
than on account of its indemnity agreement contained in this paragraph. The
Company will be entitled to participate at its own expense in the defense or, if
it so elects, to assume the defense of any suit brought to enforce any such
liability, but if the Company elects to assume the defense, such defense shall
be conducted by counsel chosen by it. In the event the Company elects to assume
the defense of any such suit and retain such counsel, any Underwriter
Indemnified Parties, defendant or defendants in the suit, may retain additional
counsel but shall bear the fees and expenses of such counsel unless (i) the
Company shall have specifically authorized in writing the retaining of such
counsel or (ii) the parties to such suit include any such Underwriter
Indemnified Parties and the Company, and such Underwriter Indemnified Parties at
law or in equity have been advised by counsel to the Underwriters that one or
more legal defenses may be available to it or them which may not be available to
the Company, in which case the Company shall not be entitled to assume the
defense of such suit notwithstanding its obligation to bear the fees and
expenses of such counsel. The Company shall not be liable to indemnify any
person for any settlement of any such claim effected without the Company's
consent. This indemnity agreement is not exclusive and will be in addition to
any liability which the Company might otherwise have and shall not limit any
rights or remedies which may otherwise be available at law or in equity to each
Underwriter Indemnified Party.

          (b) Subject to the provisions of subparagraph (e) of this Section 6,
each Selling Stockholder agrees to indemnify and hold harmless each Underwriter
Indemnified Party against any losses, claims, damages, liabilities or expenses
(including, unless such Selling Stockholder elects to assume the defense, the
reasonable cost of investigating and defending against any claims therefor and
counsel fees incurred in connection therewith), joint or several, which may be
based upon the Securities Act, the Exchange Act or any other statute or at
common law, on the ground or alleged ground that any Preeffective Prospectus,
the Registration Statement or the Prospectus (or any Preeffective Prospectus,
the Registration Statement or the Prospectus, as from time to time amended and
supplemented) includes an untrue statement of a material fact or omits to state
a material fact required to be stated therein or necessary in order to make the
statements therein, in light of the circumstances under which they were made,
not misleading, unless such statement or omission was made in reliance upon, and
in conformity with, written information furnished to the Company by any
Underwriter, directly or through Representatives, specifically for use in the
preparation thereof; provided, that with respect to any untrue statement or
omission or alleged untrue statement or omission made in any Registration
Statement, the indemnity agreement contained in this subsection (b) shall not
inure to the benefit of any Underwriter Indemnified Party from whom the person
asserting any such losses, claims, damages or liabilities purchased the shares
of Stock concerned to the extent that any such loss, claim, damage or liability
of such Underwriter Indemnified Party results from the fact that a copy of the
Prospectus was not sent or given to such person at or prior to the written
confirmation of the sale of such shares of Stock to such person as required by
the Securities Act and if the untrue statement or omission concerned has been
corrected in the Prospectus; provided, however, that in no case is such Selling

                                      -22-
<PAGE>
 
Stockholder to be liable with respect to any claims made against any Underwriter
Indemnified Party against whom the action is brought unless such Underwriter
Indemnified Party shall have notified such Selling Stockholder in writing within
a reasonable time after the summons or other first legal process giving
information of the nature of the claim served upon the Underwriter Indemnified
Party, but failure to notify such Selling Stockholder of such claim shall not
relieve it from any liability which it may have to any Underwriter Indemnified
Party otherwise than on account of its indemnity agreement contained in this
paragraph; and provided, further, that with respect to any indemnfication
arising out of or based upon any breach of any representation contained in
Section 2 hereof, the Underwriters agree to exhaust their remedies against the
Company before proceeding against the Selling Stockholders.  Such Selling
Stockholder shall be entitled to participate at his own expense in the defense,
or, if he so elects, to assume the defense of any suit brought to enforce any
such liability, but, if such Selling Stockholder elects to assume the defense,
such defense shall be conducted by counsel chosen by him.  In the event that any
Selling Stockholder elects to assume the defense of any such suit and retain
such counsel, the Underwriter Indemnified Parties, defendant or defendants in
the suit, may retain additional counsel but shall bear the fees and expenses of
such counsel unless (i) such Selling Stockholder shall have specifically
authorized in writing the retaining of such counsel or (ii) the parties to such
suit include such Underwriter Indemnified Parties, and such Selling Stockholder
and such Underwriter Indemnified Parties have been advised by counsel that one
or more legal defenses may be available to it or them which may not be available
to such Selling Stockholder, in which case, such Selling Stockholder shall not
be entitled to assume the defense of such suit notwithstanding its obligation to
bear the fees and expenses of such counsel.  The Selling Stockholders against
whom indemnity may be sought shall not be liable to indemnify any person for any
settlement of any such claim effective without such Selling Stockholder's
consent.  This indemnity agreement is not exclusive and will be in addition to
any liability which such Selling Stockholder might otherwise have and shall not
limit any rights or remedies which may otherwise be available at law or in
equity to each Underwriter Indemnified Party.  The Company and the Selling
Stockholders may agree, as among themselves and without limiting the rights of
the Underwriters under this Agreement, as to their respective amounts of such
liability for which they each shall be responsible.

          (c) Each Underwriter severally agrees to indemnify and hold harmless
the Company, each of its directors, each of its officers who have signed the
Registration Statement and each person, if any, who controls the Company within
the meaning of the Securities Act (collectively, the "Company Indemnified
Parties") and each Selling Stockholder and each person, if any, who controls a
Selling Stockholder within the meaning of the Securities Act (collectively, the
"Stockholder Indemnified Parties"), against any losses, claims, damages,
liabilities or expenses (including, unless the Underwriter or Underwriters elect
to assume the defense, the reasonable cost of investigating and defending
against any claims therefor and counsel fees incurred in connection therewith),
joint or several, which arise out of or are based in whole or in part upon the
Securities Act, the Exchange Act or any other federal, state, local or foreign
statute or regulation, or at common law, on the ground or alleged ground that
any Preeffective Prospectus,

                                      -23-
<PAGE>
 
the Registration Statement or the Prospectus (or any Preeffective Prospectus,
the Registration Statement or the Prospectus, as from time to time amended and
supplemented) includes an untrue statement of a material fact or omits to state
a material fact required to be stated therein or necessary in order to make the
statements therein, in light of the circumstances in which they were made, not
misleading, but only insofar as any such statement or omission was made in
reliance upon, and in conformity with, written information furnished to the
Company by such Underwriter, directly or through the Representatives,
specifically for use in the preparation thereof; provided, however, that in no
case is such Underwriter to be liable with respect to any claims made against
any Company Indemnified Party or Stockholder Indemnified Party against whom the
action is brought unless such Company Indemnified Party or Stockholder
Indemnified Party shall have notified such Underwriter in writing within a
reasonable time after the summons or other first legal process giving
information of the nature of the claim served upon the Company Indemnified Party
or Stockholder Indemnified Party, but failure to notify such Underwriter of such
claim shall not relieve it from any liability which it may have to any Company
Indemnified Party or Stockholder Indemnified Party otherwise than on account of
its indemnity agreement contained in this paragraph. Such Underwriter shall be
entitled to participate at its own expense in the defense, or, if it so elects,
to assume the defense of any suit brought to enforce any such liability, but, if
such Underwriter elects to assume the defense, such defense shall be conducted
by counsel chosen by it. In the event that any Underwriter elects to assume the
defense of any such suit and retain such counsel, the Company Indemnified
Parties or Stockholder Indemnified Parties and any other Underwriter or
Underwriters or controlling person or persons, defendant or defendants in the
suit, shall bear the fees and expenses of any additional counsel retained by
them, respectively unless (i) the Underwriter shall have specifically authorized
                                                                                
in writing the retaining of such counsel or (ii) the parties to such suit
- ----------                                                               
include the Company or a Stockholder Indemnified Party, and the Underwriters and
such Company or Stockholder Indemnified Party at law or in equity have been
advised by counsel to the Company or such Stockholder Indemnified Party that one
or more defenses may be available to them which may not be available to the
Underwriters, in which case the Underwriters shall not be entitled to assume the
defense of such suit notwithstanding its obligation to bear fees and expenses of
such counsel.  The Underwriter against whom indemnity may be sought shall not be
liable to indemnify any person for any settlement of any such claim effected
without such Underwriter's consent.  This indemnity agreement is not exclusive
and will be in addition to any liability which such Underwriter might otherwise
have and shall not limit any rights or remedies which may otherwise be available
at law or in equity to any Company Indemnified Party or Stockholder Indemnified
Party.

          (d) If the indemnification provided for in this Section 6 is
unavailable or insufficient to hold harmless an indemnified party under
subsection (a) or (b) or (c) above in respect of any losses, claims, damages,
liabilities or expenses (or actions in respect thereof) referred to herein,
then, subject to Section 6(e) below, each indemnifying party shall contribute to
the amount paid or payable by such indemnified party as a result of such losses,
claims, damages, liabilities or expenses (or actions in respect thereof) in such
proportion as is appropriate to reflect the relative benefits received by the
Company and the Selling Stockholders on the one hand and

                                      -24-
<PAGE>
 
the Underwriters on the other from the offering of the Stock. If, however, the
allocation provided by the immediately preceding sentence is not permitted by
applicable law, then each indemnifying party shall contribute to such amount
paid or payable by such indemnified party in such proportion as is appropriate
to reflect not only such relative benefits but also the relative fault of the
Company and the Selling Stockholders on the one hand and the Underwriters on the
other in connection with the statements or omissions which resulted in such
losses, claims, damages, liabilities or expenses (or actions in respect
thereof), as well as any other relevant equitable considerations. The relative
benefits received by the Company and the Selling Stockholders on the one hand
and the Underwriters on the other shall be deemed to be in the same proportion
as the total net proceeds from the offering (before deducting expenses) received
by the Company and the Selling Stockholders bear to the total underwriting
discounts and commissions received by the Underwriters, in each case as set
forth in the table on the cover page of the Prospectus. The relative fault shall
be determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state
a material fact relates to information supplied by the Company, the Selling
Stockholders or the Underwriters and the parties' relative intent, knowledge,
access to information and opportunity to correct or prevent such statement or
omission. The Company, the Selling Stockholders and the Underwriters agree that
it would not be just and equitable if contribution were determined by pro rata
allocation (even if the Underwriters were treated as one entity for such
purpose) or by any other method of allocation which does not take account of the
equitable considerations referred to above. The amount paid or payable by an
indemnified party as a result of the losses, claims, damages, liabilities or
expenses (or actions in respect thereof) referred to above shall be deemed to
include any legal or other expenses reasonably incurred by such indemnified
party in connection with investigating, defending, settling or compromising any
such claim. Notwithstanding the provisions of this subsection (d), no
Underwriter shall be required to contribute any amount in excess of the amount
by which the total price at which the shares of the Stock underwritten by it and
distributed to the public were offered to the public exceeds the amount of any
damages which such Underwriter has otherwise been required to pay by reason of
such untrue or alleged untrue statement or omission or alleged omission. The
Underwriters' obligations to contribute are several in proportion to their
respective underwriting obligations and not joint. 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.

          (e) The liability of each Selling Stockholder under such Selling
Stockholder's representations and warranties contained in Section 2 hereof and
under the indemnity and reimbursement agreements contained in the provisions of
this Section 5 and Section 6 hereof shall be limited to the lesser of (i)  that
portion of the total of such losses, claims, damages, liabilities or expenses
indemnified against equal to the proportion of the Stock sold by such Selling
Stockholder to the Underwriters or (ii)  the proceeds (net of underwriting
discounts and commission) received upon the sale of the Stock sold by such
selling Stockholder to the Underwriters.

                                      -25-
<PAGE>
 
          7.   Survival of Indemnities, Representations, Warranties, etc.  The
               ---------------------------------------------------------      
respective indemnities, covenants, agreements, representations, warranties and
other statements of the Company, the Selling Stockholders and the several
Underwriters, as set forth in this Agreement or made by them respectively,
pursuant to this Agreement, shall remain in full force and effect, regardless of
any investigation made by or on behalf of any Underwriter, the Selling
Stockholders, the Company or any of its officers or directors or any controlling
person, and shall survive delivery of and payment for the Stock.

          8.  Conditions of Underwriters Obligations.  The respective
              --------------------------------------                 
obligations of the several Underwriters hereunder shall be subject to the
accuracy, at and (except as otherwise stated herein) as of the date hereof and
at and as of the Closing Dates, of the representations and warranties made
herein by the Company and the Selling Stockholders, to compliance at and as of
the Closing Dates by the Company and the Selling Stockholders with their
covenants and agreements herein contained and other provisions hereof to be
satisfied at or prior to the Closing Dates, and to the following additional
conditions:

               (a) The Registration Statement shall have become effective and no
          stop order suspending the effectiveness thereof shall have been issued
          and no proceedings for that purpose shall have been initiated or, to
          the knowledge of the Company or the Representatives, shall be
          threatened by the Commission, and any request for additional
          information on the part of the Commission (to be included in the
          Registration Statement or the Prospectus or otherwise) shall have been
          complied with to the reasonable satisfaction of the Representatives.
          Any filings of the Prospectus, or any supplement thereto, required
          pursuant to Rule 424 (b) or Rule 434 of the Rules and Regulations,
          shall have been made in the manner and within the time period required
          by Rule 424(b) and Rule 434 of the Rules and Regulations, as the case
          may be.

               (b) The Representatives shall have been satisfied that there
          shall not have occurred any change prior to the Closing Dates in the
          condition (financial or otherwise), properties, business, management,
          net worth or results of operations of the Company, or any change in
          the capital stock, or any material change in short-term or long-term
          debt of the Company, such that (i) the Registration Statement or the
          Prospectus, or any amendment or supplement thereto, contains an untrue
          statement of fact which, in the opinion of the Representatives, is
          material, or omits to state a fact which, in the opinion of the
          Representatives, is required to be stated therein or is necessary to
          make the statements therein not misleading, or (ii) it is
          unpracticable in the reasonable judgment of the Representatives to
          proceed with the public offering or purchase the Stock as contemplated
          hereby.

                                      -26-
<PAGE>
 
               (c) The Representatives shall be satisfied that no legal or
          governmental action, suit or proceeding affecting the Company which is
          material and adverse to the Company or which affects or may affect the
          Company's or the Selling Stockholders' ability to perform their
          respective obligations under this Agreement shall have been instituted
          or threatened and there shall have occurred no material adverse
          development in any existing such action, suit or proceeding.

               (d) At the time of execution of this Agreement, the
          Representatives shall have received from Deloitte & Touche LLP,
          independent certified public accountants, a letter, dated the date
          hereof, in form and substance satisfactory to the Underwriters.

               (e) The Representatives shall have received from Deloitte &
          Touche LLP, independent certified public accountants, a letter, dated
          the Closing Dates, to the effect that such accountants reaffirm, as of
          the Closing Dates, and as though made on the Closing Date(s), the
          statements made in the letter furnished by such accountants pursuant
          to paragraph (d) of this Section 8.

               (f) The Representatives shall have received from Foley, Hoag &
          Eliot LLP, counsel for the Company and for the Selling of
          Stockholders, an opinion, dated the Closing Dates, to the effect set
          forth in Exhibit I hereto and from Foley, Hoag & Eliot LLP or other
          counsel for the Selling Stockholders reasonably acceptable to the
          Representatives, an opinion, dated the Closing Dates, to the effect
          set forth in Exhibit II hereto.

               (g) The Representatives shall have received from Testa, Hurwitz &
          Thibeault, LLP, counsel for the Underwriters, their opinion or
          opinions dated the Closing Dates with respect to the incorporation of
          the Company, the validity of the Stock, the Registration Statement and
          the Prospectus and such other related matters as they may reasonably
          request, and the Company and the Selling Stockholders shall have
          furnished to such counsel such documents as they may request for the
          purpose of enabling them to pass upon such matters.

               (h) The Representatives shall have received a certificate, dated
          the Closing Dates, of the Chief Executive Officer or the President and
          the chief financial or accounting officer of the Company to the effect
          that:

                    (i) No stop order suspending the effectiveness of the
               Registration Statement has been issued, and, to the best of the
               knowledge of the signers, no proceedings for that purpose have
               been instituted or are pending or contemplated under the
               Securities Act;

                                      -27-
<PAGE>
 
                    (ii) Neither any Preeffective Prospectus, as of its date,
               nor the Registration Statement nor the Prospectus, nor any
               amendment or supplement thereto, as of the time when the
               Registration Statement became effective and at all times
               subsequent thereto up to the delivery of such certificate,
               included any untrue statement of a material fact or omitted 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;

                    (iii)  Subsequent to the respective dates as of which
               information is given in the Registration Statement and the
               Prospectus, and except as set forth or contemplated in the
               Prospectus, the Company has not incurred any material liabilities
               or obligations, direct or contingent, nor entered into any
               material transactions, not in the ordinary course of business and
               there has not been any material adverse change in the condition
               (financial or otherwise), properties, business, management, net
               worth or results of operations of the Company, or any change in
               the capital stock (except pursuant to stock plans and warrants
               described in the Registration Statement), or any material change
               in the short-term or long-term debt of the Company;

                    (iv) The representations and warranties of the Company in
               this Agreement are true and correct at and as of the Closing
               Dates, and the Company has complied with all the agreements and
               performed or satisfied all the conditions on its part to be
               performed or satisfied at or prior to the Closing Dates; and

                    (v) Since the respective dates as of which information is
               given in the Registration Statement and the Prospectus, and
               except as disclosed in or contemplated by the Prospectus, (i)
               there has not been any material adverse change or a development
               involving a material adverse change in the condition (financial
               or otherwise), properties, business, management, net worth or
               results of operations of the Company; (ii) the business and
               operations conducted by the Company have not sustained a loss by
               strike, fire, flood, accident or other calamity (whether or not
               insured) of such a character as to interfere materially with the
               conduct of the business and operations of the Company; (iii) no
               legal or governmental action, suit or proceeding is pending or
               threatened against the Company which is material to the Company,
               whether or not arising from transactions in the ordinary course
               of business, or which may materially and adversely affect the
               transactions contemplated by this Agreement; (iv) since such
               dates and except as so disclosed, the Company has not incurred
               any

                                      -28-
<PAGE>
 
               material liability or obligation, direct, contingent or
               indirect, made any change in its capital stock (except pursuant
               to stock plans and warrants described in the Registration
               Statement), made any material change in its short-term or funded
               debt or repurchased or otherwise acquired any of the Company's
               capital stock; and (v) the Company has not declared or paid any
               dividend, or made any other distribution, upon its outstanding
               capital stock payable to stockholders of record on a date prior
               to the Closing Date.

               (i) The Representatives shall have received a certificate or
          certificates, dated the Closing Dates, of each of the Selling
          Stockholders to the effect that as of the Closing Dates its
          representations and warranties in this Agreement are true and correct
          as if made on and as of the Closing Dates, and that it has performed
          all its obligations and satisfied all the conditions on its part to be
          performed or satisfied at or prior to the Closing Dates.

               (j) The Company and each of the Selling Stockholders shall have
          furnished to the Representatives such additional certificates as the
          Representatives may have reasonably requested as to the accuracy, at
          and as of the Closing Dates, of the representations and warranties
          made herein by them and as to compliance at and as of the Closing
          Dates by them with their covenants and agreements herein contained and
          other provisions hereof to be satisfied at or prior to the Closing
          Dates, and as to satisfaction of the other conditions to the
          obligations of the Underwriters hereunder.

               (k) Cowen shall have received the written agreements of the
          officers, directors and holders of Common Stock and options to
          purchase Common Stock listed in Schedule C that each will not offer,
          sell, assign, transfer, encumber, contract to sell, grant an option to
          purchase or otherwise dispose of any shares of Common Stock held by
          such person (including without limitation any shares of Common Stock
          that may be deemed to be beneficially owned by such person on the date
          hereof in accordance with the Rules and Regulations) or any securities
          convertible into, derivative of or exercisable or exchangeable for
          such Common Stock for 180 days commencing on the date of the final
          prospectus, except for (i) shares of Common Stock sold pursuant to
          this Agreement, if any, and (ii) shares of Common Stock purchased by
          such person in the public market pursuant to brokers' transactions,
          (iii) shares of Common Stock sold to the Company or the entities on
          Schedule D and (iv) distributions of Common Stock to limited partners
          or shareholders of such Selling Stockholder provided that the
          distributees thereof agree in writing to be bound by the terms of this
          restriction.

          All opinions, certificates, letters and other documents will be in
 compliance with the provisions hereunder only if they are satisfactory in form
 and substance to the

                                      -29-
<PAGE>
 
 Representatives. The Company will furnish to the Representatives conformed
 copies of such opinions, certificates, letters and other documents as the
 Representatives shall reasonably request. If any of the conditions hereinabove
 provided for in this Section shall not have been satisfied when and as required
 by this Agreement, this Agreement may be terminated by the Representatives by
 notifying the Company of such termination in writing or by telegram at or prior
 to the Closing Dates, but Cowen shall be entitled to waive any of such
 conditions.

          9.  Effective Date.  This Agreement shall become effective immediately
              --------------                                                    
 as to Sections 5, 6, 7, 9, 10, 11, 13, 14, 15, 16 and 17 and, as to all other
 provisions, at 11:00 a.m. New York City time on the first full business day
 following the effectiveness of the Registration Statement or at such earlier
 time after the Registration Statement becomes effective as the Representatives
 may determine on and by notice to the Company or by release of any of the Stock
 for sale to the public.  For the purposes of this Section 9, the Stock shall be
 deemed to have been so released upon the release for publication of any
 newspaper advertisement relating to the Stock or upon the release by you of
 telegrams (i) advising Underwriters that the shares of Stock are released for
 public offering or (ii) offering the Stock for sale to securities dealers,
 whichever may occur first.

          10.  Termination.  This Agreement (except for the provisions of
               -----------                                               
 Section 5) may be terminated by the Company at any time before it becomes
 effective in accordance with Section 9 by notice to the Representatives and may
 be terminated by the Representatives at any time before it becomes effective in
 accordance with Section 9 by notice to the Company.  In the event of any
 termination of this Agreement under this or any other provision of this
 Agreement, there shall be no liability of any party to this Agreement to any
 other party, other than as provided in Sections 5, 6 and 11 and other than as
 provided in Section 12 as to the liability of defaulting Underwriters.

          This Agreement may be terminated after it becomes effective by the
Representatives by notice to the Company (i) if at or prior to the First Closing
Date, or the Option Closing Date trading in securities on any of the New York
Stock Exchange, American Stock Exchange, or the Nasdaq National Market shall
have been suspended or minimum or maximum prices shall have been established on
any such exchange or market, or a banking moratorium shall have been declared by
New York or United States authorities; (ii) trading of any securities of the
Company shall have been suspended on any exchange or in any over-the-counter
market; (iii) if at or prior to the First Closing Date or the Option Closing
Date there shall have been (A) an outbreak or escalation of hostilities between
the United States and any foreign power or of any other insurrection or armed
conflict involving the United States or (B) any change in financial markets or
any calamity or crisis which, in the judgment of the Representatives,

                                      -30-
<PAGE>
 
makes it impractical or inadvisable to offer or sell the Firm Stock or Optional
Stock, as applicable, on the terms contemplated by the Prospectus; (iv) if there
shall have been any development or prospective development involving
particularly the business or properties or securities of the Company or the
transactions contemplated by this Agreement, which, in the judgment of the
Representatives, makes it impracticable or inadvisable to offer or deliver the
Firm Stock or the Optional Stock, as applicable, on the terms contemplated by
the Prospectus; (v) if there shall be any litigation or proceeding, pending or
threatened, which, in the judgment of the Representatives, makes it
impracticable or inadvisable to offer or deliver the Firm Stock or Optional
Stock, as applicable, on the terms contemplated by the Prospectus; or (vi) if
there shall have occurred any of the events specified in the immediately
preceding clauses (i) - (v) together with any other such event that makes it, in
the judgment of the Representatives, impractical or inadvisable to offer or
deliver the Firm Stock or Optional Stock, as applicable, on the terms
contemplated by the Prospectus.

          11.  Reimbursement of Underwriters.  Notwithstanding any other
               -----------------------------                            
provisions hereof, if this Agreement shall not become effective by reason of any
election of the Company pursuant to the first paragraph of Section 10 or shall
be terminated by the Representatives under Section 8 or Section 10, the Company
will bear and pay the expenses specified in Section 5 hereof and, in addition to
its obligations pursuant to Section 6 hereof, the Company will reimburse the
reasonable out-of-pocket expenses of the several Underwriters (including
reasonable fees and disbursements of counsel for the Underwriters) incurred in
connection with this Agreement and the proposed purchase of the Stock, and
promptly upon demand the Company will pay such amounts to you as
Representatives.

          12.  Substitution of Underwriters.  If any Underwriter or Underwriters
               ----------------------------                                     
shall default in its or their obligations to purchase shares of Stock hereunder
and the aggregate number of shares which such defaulting Underwriter or
Underwriters agreed but failed to purchase does not exceed ten percent (10%) of
the total number of shares underwritten, the other Underwriters shall be
obligated severally, in proportion to their respective commitments hereunder, to
purchase the shares which such defaulting Underwriter or Underwriters agreed but
failed to purchase.  If any Underwriter or Underwriters shall so default and the
aggregate number of shares with respect to which such default or defaults occur
is more than ten percent (10%) of the total number of shares underwritten and
arrangements satisfactory to the Representatives and the Company for the
purchase of such shares by other persons are not made within forty-eight (48)
hours after such default, this Agreement shall terminate.

          If the remaining Underwriters or substituted Underwriters are required
hereby or agree to take up all or part of the shares of Stock of a defaulting
Underwriter or Underwriters as provided in this Section 12, (i) the Company and
the Selling Stockholders shall have the right to postpone the Closing Dates for
a period of not more than five (5) full business days in order that the Company
and the Selling Stockholders may effect whatever changes may thereby be made
necessary in the Registration Statement or the Prospectus, or in any other
documents or arrangements, and the Company agrees promptly to file any
amendments to the Registration Statement or supplements to the Prospectus which
may thereby be made necessary, and (ii) the respective numbers of shares to be
purchased by the remaining Underwriters or substituted Underwriters shall be
taken as the basis of their underwriting obligation for all purposes of this
Agreement.  Nothing herein contained shall relieve any defaulting Underwriter of
its liability to

                                      -31-
<PAGE>
 
the Company, the Selling Stockholders or the other Underwriters for damages
occasioned by its default hereunder. Any termination of this Agreement pursuant
to this Section 12 shall be without liability on the part of any non-defaulting
Underwriter, the Selling Stockholders or the Company, except for expenses to be
paid or reimbursed pursuant to Section 5 and except for the provisions of
Section 6.

          13.  Notices.  All communications hereunder shall be in writing and,
               -------                                                        
if sent to the Underwriters shall be mailed, delivered or telegraphed and
confirmed to you, as their Representatives c/o Cowen & Company at Financial
Square, New York, New York 10005 except that notices given to an Underwriter
pursuant to Section 6 hereof shall be sent to such Underwriter at the address
furnished by the Representatives or, if sent to the Company, shall be mailed,
delivered or telegraphed and confirmed at Lightbridge, Inc., 281 Winter Street,
Waltham, Massachusetts 02154.  With respect to the Selling Stockholders, notices
may be sent to an Attorney-in-Fact.

          14.  Successors.  This Agreement shall inure to the benefit of and be
               ----------                                                      
binding upon the several Underwriters, the Company and the Selling Stockholders
and their respective successors and legal representatives.  Nothing expressed or
mentioned in this Agreement is intended or shall be construed to give any person
other than the persons mentioned in the preceding sentence any legal or
equitable right, remedy or claim under or in respect of this Agreement, or any
provisions herein contained, this Agreement and all conditions and provisions
hereof being intended to be and being for the sole and exclusive benefit of such
persons and for the benefit of no other person; except that the representations,
warranties, covenants, agreements and indemnities of the Company and the Selling
Stockholders contained in this Agreement shall also be for the benefit of the
person or persons, if any, who control any Underwriter or Underwriters within
the meaning of Section 15 of the Securities Act or Section 20 of the Exchange
Act, and the indemnities of the several Underwriters shall also be for the
benefit of each director of the Company, each of its officers who has signed the
Registration Statement and the person or persons, if any, who control the
Company or any Selling Stockholders within the meaning of Section 15 of the
Securities Act or Section 20 of the Exchange Act.

          15.  Applicable Law.  This Agreement shall be governed by and
               --------------                                          
construed in accordance with the laws of the State of New York.

          16.  Authority of the Representatives.  In connection with this
               --------------------------------                          
Agreement, you will act for and on behalf of the several Underwriters, and any
action taken under this Agreement by Cowen, as Representative, will be binding
on all the Underwriters; and any action taken under this Agreement by any of the
Attorneys-in-fact will be binding on all of the Selling Stockholders.

          17.  Partial Unenforceability.  The invalidity or unenforceability of
               ------------------------                                        
any Section, paragraph or provision of this Agreement shall not affect the
validity or enforceability of any other Section, paragraph or provision hereof.
If any Section, paragraph or provision of this Agreement





                                      -32-
<PAGE>
 
 is for any reason determined to be invalid or unenforceable, there shall be
deemed to be made such minor changes (and only such minor changes) as are
necessary to make it valid and enforceable.

          18.  General.  This Agreement constitutes the entire agreement of the
               -------                                                         
parties to this Agreement and supersedes all prior written or oral and all
contemporaneous oral agreements, understandings and negotiations with respect to
the subject matter hereof.

          In this Agreement, the masculine, feminine and neuter genders and the
singular and the plural include one another.  The section headings in this
Agreement are for the convenience of the parties only and will not affect the
construction or interpretation of this Agreement.  This Agreement may be amended
or modified, and the observance of any term of this Agreement may be waived,
only by a writing signed by the Company, the Selling Stockholders and the
Representatives.

          19.  Counterparts.  This Agreement may be signed in two (2) or more
               ------------                                                  
counterparts, each of which shall be an original, with the same effect as if the
signatures thereto and hereto were upon the same instrument.

          Any person executing and delivering this Agreement as Attorney-in-fact
for the Selling Stockholders represents by so doing that he has been duly
appointed as Attorney-in-fact by such Selling Stockholder pursuant to a validly
existing and binding Power of Attorney which authorizes such Attorney-in-fact to
take such action.

          If the foregoing correctly sets forth our understanding, please
indicate your acceptance thereof in the space provided below for that purpose,
whereupon this letter and your acceptance shall constitute a binding agreement
between us.

                                  Very truly yours,
                                  LIGHTBRIDGE, INC.


                                  

                                  By:
                              
                                  Name:
                                  Title:


                                  SELLING STOCKHOLDERS LISTED
                                  IN SCHEDULE B


                                  

                                      -33-
<PAGE>
 
                                  By:
                                  
                                  Pamela D.A. Reeve
                                  Attorney-in-fact

                                  By:
                                  
                                  William G. Brown
                                  Attorney-in-fact

                                  Acting on behalf of the Selling Stockholders
                                  listed in Schedule B.

                                      -34-
<PAGE>
 
Accepted and delivered in
New York New York as of
the date first above written.

COWEN & COMPANY
MONTGOMERY SECURITIES
PRUDENTIAL SECURITIES
INCORPORATED

By:  COWEN & COMPANY
Acting on their own behalf and as
Representatives of several Underwriters
referred to in the foregoing Agreement.

By:  Cowen Incorporated,
     its general partner


By:_____________________________
   Name:
   Title:

                                      -35-
<PAGE>
 
                                   SCHEDULE A
<TABLE>
<CAPTION>
 
 
                                                                           Number
                                                                           of Firm
                                                                           Shares
                                                                            to be
Name                                                                      Purchased
- -----                                                                     ---------
<S>                                                                       <C>
Cowen & Company..................................................... 
Montgomery Securities............................................... 
Prudential Securities Incorporated.................................. 
                                     
     Total..........................................................                           
                                                                          =========
           
 
</TABLE>

                                      -36-
<PAGE>
 
                                   SCHEDULE B
<TABLE>
<CAPTION>
 
 
                                                          Number
                                              Number of     of
                                              Optional     Firm
                                              Shares to  Shares to
                                               be Sold    be Sold
                                              ---------  ---------
<S>                                           <C>        <C>
Selling Stockholders
- --------------------
 
 
</TABLE>

                                      -37-
<PAGE>
 
                                   SCHEDULE C

                               LOCKUP AGREEMENTS



[to include all stockholders and notice of the lock-up to be sent to
optionholders]

                                      -38-
<PAGE>
 
                                   SCHEDULE D



ENTREPRENEURIAL LIMITED PARTNERSHIP I
ENTREPRENEURIAL LIMITED PARTNERSHIP II
ENTREPRENEURIAL LIMITED PARTNERSHIP III
ENTREPRENEURIAL LIMITED PARTNERSHIP IV

                                      -39-

<PAGE>
 
                                                                    EXHIBIT 3.1

                         CERTIFICATE OF INCORPORATION

                                      OF

                           CREDIT TECHNOLOGIES, INC.

     FIRST:  The name of the Corporation is Credit Technologies, Inc.

     SECOND:  The address of the registered office of the Corporation in the
State of Delaware is 229 South State Street, Dover, County of Kent, and the name
of its registered agent at such address is The Prentice-Hall Corporation System,
Inc.

     THIRD:  The nature of the business or purposes to be conducted or promoted
is as follows:

     To engage in the business of designing, developing, marketing, licensing,
buying and selling computer software of all types and descriptions; to provide
computer and computer software related consulting services, including but not
limited to software installation, development, consulting and any other
activities related thereto.

     To acquire, hold, dispose of, buy, sell, underwrite, handle on commission
and otherwise deal in stocks, shares, bonds, notes and obligations of the
interests in corporations, joint-stock companies, trusts, associations,
partnerships, firms or persons and all forms of public and municipal securities
of this or any other country, or any right or interest therein, and while owner
thereof, to exercise all rights, powers and privileges of ownership in the same
manner and to the same extent that an individual might.

     To acquire, hold, use, construct, maintain and dispose of buildings,
plants, factories, mills, machinery, works and all other real and personal
property, tangible or intangible, of whatever kind and wherever situated, or any
right or interest therein for the purposes of the foregoing businesses, and as a
going business or otherwise, all or any part of the assets of any corporation,
joint-stock company, trust, association, firm or person, and in such cases to
assume all or any part of its or his liabilities.

     To engage in, transact and carry on any or all of the above businesses or
any other business or activity necessary or convenient for or incidental to any
or all of the foregoing or which can advantageously be conducted in connection
therewith, and to engage in, transact and carry on any business or lawful act or
activity for which corporation may be organized under the General Corporation
Law of Delaware.

     FOURTH:  The total number of shares of capital stock which the Corporation
shall have the authority to issue shall be
<PAGE>
 
2,500,000 shares of common stock, with a par value of $.01 per share.

     FIFTH:  In furtherance of and not in limitation of powers conferred by
statute, it is further provided that:

          (a)  Subject to the limitations and expectations, if any, contained in
the by-laws of the Corporation, the by-laws may be adopted, amended or repealed
by the Board of Directors of the Corporation.

          (b)  Elections of directors need not be by written ballot.

          (c)  Subject to any applicable requirements of law, the books for the
Corporation may be kept outside of the State of Delaware at such location as may
be designated by the Board of Directors or in the by-laws of the Corporation.

     SIXTH:  The Corporation is to have perpetual existence.

     SEVENTH:  The Corporation shall indemnify each person who at any time is,
or shall have been, a director or officer of the Corporation, and is threatened
to be or is made a party to any threatened, pending or completed action, suit or
proceeding, whether civil, criminal, administrative or investigative, by reason
for the fact that he is, or was, a director or officer of the Corporation, or
served at the request of the Corporation as a director, officer, employee,
trustee, or agent of another corporation, partnership, joint venture, trust or
other enterprise, against expenses (including attorneys' fees), judgments, fines
and amounts paid in settlement incurred in connection with any such action, suit
or proceeding to the maximum extent permitted by the General Corporation Law of
the State of Delaware. The foregoing right of indemnification shall in no way be
exclusive of any other rights of indemnification to which any such director or
officer may be entitled, under any by-law, agreement, vote of directors or
stockholders or otherwise.

     EIGHTH:  Whenever a compromise or arrangement is proposed between this
Corporation and its creditors or any class of them and/or between this
Corporation and its stockholders or any class of them, any court of equitable
jurisdiction within the State of Delaware may, on the application in a summary
way of this Corporation or of any creditor or stockholder thereof, or on the
application of any receiver or receivers appointed for this Corporation under
the provisions of Section 291 of Title 8 of the Delaware Code or on the
application of trustees in dissolution or of any receiver or receivers appointed
for this Corporation under the provisions of Section 279 of Title 8 of the
Delaware Code, order a meeting of the creditors or class of creditors, and/or of
the stockholders or class of stockholders of this Corporation, as the case may
be, to be summoned in such manner as the said court directs. If a majority in
number representing three-fourths in
<PAGE>
 
value of the creditors or class of creditors, and/or of the stockholders or
class of stockholders of this Corporation, as the case may be, agree to any
compromise or arrangement and to any reorganization of this Corporation as a
consequence of such compromise or arrangement, the said compromise or
arrangement and the said reorganization shall, if sanctioned by the court to
which the said application has been made, be binding on all the creditors or
class of creditors, and/or on all the stockholders or class of stockholders of
this Corporation, as the case may be, and also on this Corporation.

     NINTH:  No director of the Corporation shall be personally liable to the
Corporation or to any of its stockholders for monetary damages arising out of
such director's breach of fiduciary duty as a director of the Corporation,
except to the extent that any such limitation or elimination of liability is not
permitted by the General Corporation Law of the Sate of Delaware. No amendment
or repeal of this Article NINTH shall deprive a director of the benefits hereof
with respect to any act or omission occurring prior to such amendment or repeal.

     TENTH:  The Corporation reserves the right to amend, alter, change or
repeal any provision contained in this Certificate of Incorporation, in the
manner now or hereafter prescribed by statute, and this Certificate of
Incorporation and all rights conferred upon stockholders herein are granted
subject to this reservation.

     ELEVENTH:  The name and the mailing address of the sole incorporator is as
follows:

          NAME                               MAILING ADDRESS
          ----                               ---------------

     James A. Smith                     c/o Foley, Hoag & Eliot
                                        One Post Office Square
                                        Boston, Massachusetts 02109

     IN WITNESS WHEREOF, I have hereunto set my hand this 15th day of June,
1989.


                                             /s/ James A. Smith
                                             ----------------------------- 
                                             James A. Smith, Incorporator
<PAGE>
 
TO:  DEPARTMENT OF STATE
     Division of Corporations
     Townsend Building
     Federal Street
     Dover, Delaware  19903

     Pursuant to the provisions of Section 134 of Title 8 of the Delaware Code,
the undersigned Agent for service of process, in order to change the address of
the registered office of the corporations for which it is registered agent,
hereby certifies that:

     1.  The name of the agent is The Prentice-Hall Corporation System, Inc.

     2.  The address of the old registered office was 229 South State Street,
Dover, Kent County, Delaware 19901.

     3.  The address to which the registered office is to be changed is 32
Loockerman Square, Suite L-100, Dover, Kent County, Delaware 19901.  The new
address will be effective on October 27, 1989.

     4.  The names of the corporations represented by said agent are set forth
on the list annexed to this certificate and made a part hereof by reference.

     IN WITNESS WHEREOF, said agent has caused this certificate to be signed on
its behalf by its Vice President and Assistant Secretary this 10th day of
October 1989.

                                        THE PRENTICE-HALL CORPORATION SYSTEM


                                        /s/ Alan E. Spiewak
                                        ------------------------------------
                                        Alan Spiewak, Vice President
ATTEST:


/s/ Richard L. Kushay
- --------------------------------------
Richard L. Kushay, Assistant Secretary
<PAGE>
 
                               STATE OF DELAWARE
                         CHANGE OF ADDRESS FILING FOR
         PRENTICE-HALL CORPORATION SYSTEM, INC. AS OF OCTOBER 27, 1989
                                 **DOMESTIC**

<TABLE> 
<CAPTION> 
<S>                                                         <C> 
2199575 SENTAGE HOLDING CORPORATION                         06/16/89 D DE
2199576 NEURAL TRADING SYSTEMS, INC.                        06/16/89 D DE
2199577 ROCKUS INC.                                         06/16/89 D DE
2199578 CREDIT TECHNOLOGIES, INC.                           06/16/89 D DE
2199579 W.H.G. CHARTERS, LTD.                               06/16/89 D DE
2199580 DINNERWARE, PLUS, (AZ) INC.                         06/16/89 D DE
2199581 SHELBY TISSUE, INC.                                 06/16/89 D DE
2199582 DINNERWARE PLUS, (CO) INC.                          06/16/89 D DE
2199583 FT RESTAURANT CORP.                                 06/16/89 D DE
2199584 ERLANGER MINERALS AND METALS, INC.                  06/16/89 D DE
2199585 G.I. ACQUISITION CORP.                              06/16/89 D DE
2199586 MACON AUTOMOTIVE, INC.                              06/16/89 D DE
2199602 NEWBRIDGE REALTY CORP.                              06/16/89 D DE
2199612 TELCOST CONSULTANTS USA, INC.                       06/16/89 D DE
2199613 MARATHON MALLS, INC.                                06/16/89 D DE
2199622 P.D.T., INC.                                        06/16/89 D DE
2199626 FIBREBOARD FOREST INDUSTRIES CORPORATION            06/16/89 D DE
2199642 SOL MATE INC.                                       06/19/89 D DE
2199644 WEIGH TO GO INC.                                    06/19/89 D DE
2199646 U.S. HOVERCRAFT INC.                                06/19/89 D DE
2199654 METRO GARDENS DEVELOPMENT INC.                      06/19/89 D DE
2199655 GSI ACQUISITION CORP.                               06/19/89 D DE
2199656 EXECUTIVE SOFTWARE EUROPE INC.                      06/19/89 D DE
2199657 BGI ACQUISITION CORP.                               06/19/89 D DE
2199658 WELLINGTON FINANCIAL MANAGEMENT, INC.               06/19/89 D DE
2199675 USASIA PUBLISHING, INC.                             06/19/89 D DE
2199695 ADVENTURER ACQUISITION CORPORATION                  06/19/89 D DE
2199696 DEEP RIVER BOUTIQUE, INC.                           06/19/89 D DE
2199705 MABEY BRIDGE, INC.                                  06/19/89 D DE
2199708 ARIES FILM RELEASING CORP.                          06/19/89 D DE
2199749 JHM CAPITAL ADVISORS, INC.                          06/19/89 D DE
2199799 SURE BROADCASTING, INC.                             06/20/89 D DE
2199807 ANZUS, INC.                                         06/20/89 D DE
2199808 WHEELABRATOR MONTGOMERY INC.                        06/20/89 D DE
2199811 STANWICH INSURANCE AGENCY, INC.                     06/20/89 D DE
2199817 CONSORTIUM PERESTROICORP, INC.                      06/20/89 D DE
2199830 C.L.W., INC.                                        06/20/89 D DE
2199832 BUTTEMER, INC.                                      06/20/89 D DE
2199834 MCDONALD'S RESTAURANTES PORTUGAL LTD.               06/20/89 D DE
2199836 DEARFIELD FARMS INC.                                06/20/89 D DE
2199838 HUNTERS CAPITAL INVESTMENTS-I, INC.                 06/20/89 D DE
2199860 BNY LICENSING CORP.                                 06/20/89 D DE
2199861 GREENWOOD RACING INC.                               06/20/89 D DE
2199893 61589 ACQUISITION CORP.                             06/20/89 D DE
2199897 EBISCO, CORP.                                       06/20/89 D DE
2199905 DELTA MAILING SERVICES, INC.                        06/20/89 D DE
</TABLE> 
<PAGE>
 
                           CERTIFICATE OF AMENDMENT

                                      OF

                         CERTIFICATE OF INCORPORATION

                                      OF

                           CREDIT TECHNOLOGIES, INC.

     Credit Technologies, Inc., a corporation organized and existing under and
by virtue of the General Corporation Law of the State of Delaware, DOES HEREBY
CERTIFY:

     FIRST:  That the following amendment to the Certificate of Incorporation of
Credit Technologies, Inc. (the "Corporation") has been duly adopted in
accordance with the provisions of Section 242 of the Delaware General
Corporation Law:

     That the Certificate of Incorporation of the Corporation be amended by
deleting the old Article Fourth and inserting a new Article Fourth in its stead
which shall be and read as follows in its entirety:

     "FOURTH:  The total number of shares of capital stock which the Corporation
               shall have the authority to issue shall be 3,000,000 shares of
               common stock, with a par value of $.01 per share."
<PAGE>
 
     IN WITNESS WHEREOF, Credit Technologies, Inc. has caused this certificate
to be signed by its President and attested by its Assistant Secretary this sixth
day of November, 1990.

                                               CREDIT TECHNOLOGIES, INC.


                                               By: /s/ Pamela D. A. Reeve
                                                   -----------------------
                                                   Its President

ATTEST

By: /s/ William Brown
    -----------------------
    Its Assistant Secretary
<PAGE>
 
                           CERTIFICATE OF AMENDMENT

                                      OF

                         CERTIFICATE OF INCORPORATION

                                      OF

                           CREDIT TECHNOLOGIES, INC.

     Credit Technologies, Inc., a corporation organized and existing under and
by virtue of the General Corporation Law of the State of Delaware, DOES HEREBY
CERTIFY:

     FIRST: That the following amendment to the Certificate of Incorporation of
Credit Technologies, Inc. (the "Corporation") has been duly adopted in
accordance with the provisions of Section 242 of the Delaware General
Corporation Law:

     That the Certificate of Incorporation of the Corporation be amended by
deleting the old Article Fourth and inserting a new Article Fourth in its stead
which shall be and read as follows in its entirety:

     "FOURTH:  The total number of shares of capital stock which the Corporation
               shall have the authority to issue shall be 4,500,000 shares of
               commons stock, with a par value of $.01 per share."
<PAGE>
 
     IN WITNESS WHEREOF, Credit Technologies, Inc. has caused this certificate
to be signed by its President and attested by its Assistant Secretary this 20th
day of December, 1990.

                                               CREDIT TECHNOLOGIES, INC.


                                               By: /s/ Pamela D. A. Reeve
                                                   -----------------------
                                                   Its President

ATTEST

By: /s/ William Brown
    -----------------------
    Its Assistant Secretary
<PAGE>
 
                           CERTIFICATE OF AMENDMENT

                                      OF

                         CERTIFICATE OF INCORPORATION

                                      OF

                           CREDIT TECHNOLOGIES, INC.


     Credit Technologies, Inc., a corporation organized and existing under and
by virtue of the General Corporation Law of the State of Delaware (the
"Corporation"), DOES HEREBY CERTIFY:

     That the following amendment to the Certificate of Incorporation of the
Corporation dated June 16, 1989, as amended on November 13, 1990 and December
20, 1990, has been duly adopted in accordance with the provisions of Section 242
of the Delaware General Corporation Law:

     That the Certificate of Incorporation of the Corporation be amended by
deleting the old Article Fourth and inserting a new Article Fourth in its stead
which shall be and read as follows in its entirety:

     FOURTH:  The total number of shares of capital stock which the Corporation
shall have the authority to issue shall be 5,130,516 shares, of which 4,500,000
shall be shares of common stock, each of which shall have a par value of $.01
(the "Common Stock"), and 630,516 shall be shares of preferred stock, each of
which shall have a par value of $.01 (the "Preferred Stock"), amounting to an
aggregate par value of $51,305.16.

     The following is a statement of the designations, powers, preferences and
rights, and the qualifications, limitations and restrictions, granted to or
imposed upon the respective classes of shares of capital stock of the
Corporation or the holders thereof:
<PAGE>
 
                     SERIES A CONVERTIBLE PREFERRED STOCK

     1.   Number of Shares.  The series of Preferred Stock designated and known
          ----------------                                                     
"Series A convertible Preferred Stock" shall consist of 630,516 shares.

     2.   Voting.
          ------ 

          2A.  General.  Except as may be otherwise provided in these terms of
               -------                                                        
he Series A Convertible Preferred Stock or by law, the Series A Convertible
Preferred Stock shall vote together with all other classes and series of stock
of the Corporation as a single class on all actions to be taken by the
stockholders of the Corporation, including, without limitation, the election of
directors of the Corporation. Notwithstanding the foregoing or anything else to
the contrary provided in the Certificate of Incorporation, if the Corporation
fails or refuses, for any reason or for no reason, to redeem on the Redemption
Date (as defined in paragraph 7) all of the then outstanding shares of Series A
Convertible Preferred Stock in accordance with the terms and provisions of
paragraph 7, the holders of the Series A Convertible Preferred Stock, voting as
a separate series, shall be entitled to elect a majority of the directors of the
Corporation. Each share of Series A Convertible Preferred Stock shall entitle
the holder thereof to such number of votes per share on each such action as
shall equal the number of shares of Common Stock (including fractions of a
share) into which each share of Series A Convertible Preferred Stock is then
convertible.

          2B.  Board Size.  The Corporation shall not, without the written
               ----------                                                 
consent or affirmative vote of the holders of at least two-thirds of the then
outstanding shares of Series A Convertible Preferred Stock, given in writing or
by vote at a meeting, consenting or voting (as the case may be) separately as a
series, increase the maximum number of directors constituting the Board of
Directors to a number in excess of seven.

     3.   Dividends.  Commencing on and from October 1, 1992, the holders of the
          ---------                                                             
Series A Convertible Preferred Stock shall be entitled to receive, out of funds
legally available therefor, annual dividends at the rate per annum of $.127 per
share (annually an "Accrued Dividend" and collectively the "Accruing
Dividends"), such payments to be made (except as hereinafter provided) on the
last day of December in each year for the period ended on the immediately,prior
September 30, with the first such dividend being paid on December 31, 1993 for
the period ended September 30, 1993. Accruing Dividends shall accrue from day to
day, whether or not earned or declared, and shall be cumulative. The Board of
Directors may defer paying an Accruing Dividend for a period ended September 30
to the extent that for the Corporation's fiscal year ended such September 30 it
had consolidated net income of less than $500,000. To the extent that the
Corporation has deferred paying an Accrued Dividend,
<PAGE>
 
such Accrued Dividend shall be paid on the first December 31 thereafter in which
the Corporation's consolidated net income for the immediately prior September 30
equals or exceeds $500,000. Payment of deferred Accrued Dividends shall be made
at the rate of one deferred Accrued Dividend for each $500,000 of consolidated
net income in excess of the first $500,000. For the purposes of this paragraph
3, consolidated net income shall be determined in accordance with generally
accepted accounting principles, consistently applied.

     4.   Liquidation.  Upon any liquidation, dissolution or winding up of the
          -----------                                                         
Corporation, whether voluntary or involuntary, the holders of the shares of
Series A Convertible Preferred Stock shall first be entitled, before any
distribution or payment is made upon any stock ranking on liquidation junior to
the Series A Convertible Preferred Stock, to be paid an amount equal to the
greater of (i) $1.586 per share plus, in the case of each share, an amount equal
to all Accruing Dividends unpaid thereon (whether or not declared) and any other
dividends declared but unpaid thereon, computed to the date payment thereof is
made available, or (ii) such amount per share as would have been payable had
each such share been converted to Common Stock pursuant to paragraph 6
immediately prior to such liquidation, dissolution or winding up, and the
holders of Series A Convertible Preferred Stock shall not be entitled to any
further payment, such amount payable with respect to one share of Series A
Convertible Preferred stock being sometimes referred to as the "Liquidation
Preference Payment" and with respect to all shares of Series A Convertible
Preferred Stock being sometimes referred to as the "Liquidation Preference
Payments". If upon such liquidation, dissolution or winding up of the
Corporation, whether voluntary or involuntary, the assets to be distributed
among the holders of Series A Convertible Preferred Stock shall be insufficient
to permit payment in full to the holders of Series A Convertible Preferred Stock
of the Liquidation Preference Payments, then the entire assets of the
Corporation to be so distributed shall be distributed ratably among the holders
of Series A Convertible Preferred Stock. Upon any such liquidation, dissolution
or winding up of the Corporation, immediately after the holders of Series A
Convertible Preferred Stock shall have been paid in full the Liquidation
Preference Payments, the remaining net assets of the Corporation available for
distribution may be distributed ratably among the holders of Common Stock.
Written notice of such liquidation, dissolution or winding up, stating a payment
date and the place where said payments shall be made, shall be given by mail,
postage prepaid, or by telex to non-U.S. residents, not less than 20 days prior
to the payment date stated therein, to the holders of record of Series A
Convertible Preferred Stock, such notice to be addressed to each such holder at
its address as shown by the records of the Corporation. The consolidation or
merger of the Corporation into or with any other entity or entities which
results in the exchange of outstanding shares of the Corporation for securities
or other consideration issued or paid or caused to be issued or paid by any such
entity
<PAGE>
 
or affiliate thereof (excluding any consolidation or merger in which the
shareholders of the Corporation hold more than fifty percent (50%) of the voting
securities of the surviving corporation), and the sale or transfer by the
Corporation of all or substantially all its assets, shall be deemed to be a
liquidation, dissolution or winding up of the Corporation within the meaning of
the provisions of this paragraph 4. For purposes hereof, the Common Stock shall
rank in liquidation junior to the Series A Convertible Preferred Stock.

     5.   Restrictions.  At any time when shares of Series A Convertible
          ------------                                                  
Preferred Stock are outstanding, except where the vote or written consent of the
holders of a greater number of shares of the Corporation is required by law or
by the Certificate of Incorporation, and in addition to any other vote required
by law or the Certificate of Incorporation, without the approval of the holders
of at least two-thirds of the then outstanding shares of Series A Convertible
Preferred Stock, given in writing or by vote at a meeting, consenting or voting
(as the case may be) separately as a series, the Corporation will not:

          5A.  Create or authorize the creation of any additional class or
series of shares of stock unless the same ranks junior to the Series A
Convertible Preferred Stock as to the distribution of assets on the liquidation,
dissolution or winding up of the Corporation, or increase the authorized amount
of the Series A Convertible Preferred Stock or increase the authorized amount of
any additional class or series of shares of stock unless the same ranks junior
to the Series A Convertible Preferred Stock as to the distribution of assets on
the liquidation, dissolution or winding up of the Corporation, or create or
authorize any obligation or security convertible into shares of Series A
Convertible Preferred Stock or into shares of any other class or series of stock
unless the same ranks junior to the Series A Convertible Preferred Stock as to
the distribution of assets on the liquidation, dissolution or winding up of the
Corporation, whether any such creation, authorization or increase shall be by
means of amendment to the Certificate of Incorporation or by merger,
consolidation or otherwise;

          5B.  Consent to any liquidation, dissolution or winding up of the
Corporation or consolidate or merge into or with any other entity or entities or
sell or transfer all or substantially all its assets;

          5C.  Amend, alter or repeal its Certificate of Incorporation or By-
laws so as to adversely affect the rights of the holders of the Series A
Convertible Preferred Stock;

          5D.  Purchase or set aside any sums for the purchase of, or pay any
dividend or make any distribution on, any shares of stock other than the Series
A Convertible Preferred Stock, except for dividends or other distributions
payable on the Common Stock solely in the form of additional shares of Common
Stock and
<PAGE>
 
except for the purchase of shares of Common Stock from former employees of the
Corporation who acquired such shares directly from the Corporation, if each such
purchase is made pursuant to contractual rights held by the Corporation relating
to the termination of employment of such former employee and the purchase price
does not exceed the original issue price paid by such former employee to the
Corporation for such shares; or

          5E.  Redeem or otherwise acquire any shares of Series A Convertible
Preferred Stock except as expressly authorized in paragraph 7 hereof or pursuant
to a purchase offer made pro rata to all holders of the shares of Series A
Convertible Preferred Stock on the basis of the aggregate number of outstanding
shares of Series A Convertible Preferred Stock then held by each such holder.

     6.   Conversions.  The holders of shares of Series A Convertible Preferred
          -----------                                                          
Stock shall have the following conversion rights:

          6A.  Right to Convert.  Subject to the terms and conditions of this
               ----------------                                              
paragraph 6, the holder of any share or shares of Series A Convertible Preferred
Stock shall have the right, at its option at any time, to convert any such
shares of Series A Convertible Preferred Stock (except that upon any liquidation
of the Corporation the right of conversion shall terminate at the close of
business on the business day fixed for payment of the amount distributable on
the Series A Convertible Preferred Stock) into such number of fully paid and
nonassessable shares of Common Stock as is obtained by (i) multiplying the
number of shares of Series A Convertible Preferred Stock so to be converted by
$1.586 and (ii) dividing the result by the conversion price of $1.586 per share
or, in case an adjustment of such price has taken place pursuant to the further
provisions of this paragraph 6, then by the conversion price as last adjusted
and in effect at the date any share or shares of Series A Convertible Preferred
Stock are surrendered for conversion (such price, or such price as last
adjusted, being referred to as the "Conversion Price"). Such rights of
conversion shall be exercised by the holder thereof by giving written notice
that the holder elects to convert a stated number of shares of Series A
Convertible Preferred Stock into Common Stock and by surrender of a certificate
or certificates for the shares so to be converted to the Corporation at its
principal office (or such other office or agency of the Corporation as the
Corporation may designate by notice in writing to the holders of the Series A
Convertible Preferred Stock) at any time during its usual business hours on the
date set forth in such notice, together with a statement of the name or names
(with address) in which the certificate or 'Certificates for shares of Common
Stock shall be issued.

          6B.  Issuance of Certificates; Time Conversion Effected.  Promptly
               --------------------------------------------------           
after the receipt of the written notice referred to in subparagraph 6A and
surrender of the certificate
<PAGE>
 
or certificates for the share or shares of Series A Convertible Preferred Stock
to be converted, the Corporation shall issue and deliver, or cause to be issued
and delivered, to the holder, registered in such name or names as such holder
may direct, a certificate or certificates for the number of whole shares of
Common Stock issuable upon the conversion of such share or shares of Series A
Convertible Preferred Stock. To the extent permitted by law, such conversion
shall be deemed to have been effected and the Conversion Price shall be
determined as of the close of business on the date on which such written notice
shall have been received by the Corporation and the certificate or certificates
for such share or shares shall have been surrendered as aforesaid, and at such
time the rights of the holder of such share or shares of Series A Convertible
Preferred Stock shall cease, and the person or persons in whose name or names
any certificate or certificates for shares of Common Stock shall be issuable
upon such conversion shall be deemed to have become the holder or holders of
record of the shares represented thereby.

          6C.  Fractional Shares; Dividends; Partial Conversion.  No fractional
               ------------------------------------------------                
shares shall be issued upon conversion of Series A Convertible Preferred Stock
into Common Stock and no payment or adjustment shall be made upon any conversion
on account of any cash dividends on the Common Stock issued upon such
conversion. At the time of each conversion, the Corporation shall pay, out of
assets legally available therefor, in cash an amount equal to all dividends,
excluding Accruing Dividends, declared and unpaid on the shares of Series A
Convertible Preferred Stock surrendered for conversion to the date upon which
such conversion is deemed to take place as provided in subparagraph 6B. In
case the number of shares of Series A Convertible Preferred Stock represented by
the certificate or certificates surrendered pursuant to subparagraph 6A exceeds
the number of shares converted, the Corporation shall, upon such conversion,
execute and deliver to the holder, at the expense of the Corporation, a new
certificate or certificates for the number of shares of Series A Convertible
Preferred Stock represented by the certificate or certificates surrendered which
are not to be converted. If any fractional share of Common Stock would, except
for the provisions of the first sentence of this subparagraph 6C, be delivered
upon such conversion, the Corporation, in lieu of delivering such fractional
share, shall pay to the holder surrendering the Series A Convertible Preferred
Stock for conversion an amount in cash equal to the current market price of such
fractional share as determined in good faith by the Board of Directors of the
Corporation.

          6D.  Adjustment of Price Upon Issuance of Common Stock.  Except as
               -------------------------------------------------            
provided in subparagraph 6E, if and whenever the Corporation shall issue or
sell, or is, in accordance with subparagraphs 6D(1) through 6D(7), deemed to
have issued or sold, any shares of Common Stock for a consideration per share
less than the Conversion Price in effect immediately prior to the time of such
issue or sale, then, forthwith upon such issue or sale,
<PAGE>
 
the Conversion Price shall be reduced to the price determined by dividing (i) an
amount equal to the sum of (a) the number of shares of Common Stock outstanding
immediately prior to such issue or sale (including the number of shares of
Common Stock then issued or issuable upon conversion of all issued and
outstanding shares of series A Convertible Preferred Stock) multiplied by the
then existing Conversion Price and (b) the consideration, if any, received by
the Corporation upon such issue or sale, by (ii) the total number of shares of
Common Stock outstanding immediately after such issue or sale (including the
number of shares of Common Stock then issued or issuable upon conversion of all
issued and outstanding shares of Series A Convertible Preferred Stock).

     For purposes of this subparagraph 6D, the following subparagraphs 6D(1) to
6D(7) shall also be applicable:

               6D(1)  Issuance of Rights or Options.  In case at any time the
                      -----------------------------                          
     Corporation shall in any manner grant (whether directly or by assumption in
     a merger or otherwise) any warrants or other rights to subscribe for or to
     purchase, or any options for the purchase of, Common Stock or any stock or
     security convertible into or exchangeable for Common Stock (such warrants,
     rights or options being called "Options" and such convertible or
     exchangeable stock or securities being called "Convertible Securities")
     whether or not such Options or the right to convert or exchange any such
     Convertible Securities are immediately exercisable, and the price per share
     for which Common Stock is issuable upon the exercise of such Options or
     upon the conversion or exchange of such Convertible Securities (determined
     by dividing (i) the total amount, if any, received or receivable by the
     Corporation as consideration for the granting of such Options, plus the
     minimum aggregate amount of additional consideration payable to the
     Corporation upon the exercise of all such Options, plus, in the case of
     such Options which relate to Convertible Securities, the minimum aggregate
     amount of additional consideration, if any, payable upon the issue or sale
     of such Convertible Securities and upon the conversion or exchange thereof,
     by (ii) the total maximum number of shares of Common Stock issuable upon
     the exercise of such Options or upon the conversion or exchange of all such
     Convertible Securities issuable upon the exercise of such Options) shall be
     less than the Conversion Price in effect immediately prior to the time of
     the granting of such options, then the total maximum number of shares of
     Common Stock issuable upon the exercise of such Options or upon conversion
     or exchange of the total maximum amount of such Convertible Securities
     issuable upon the exercise of such Options shall be deemed to have been
     issued for such price per share as of the date of granting of such Options
     or the issuance of such Convertible Securities and thereafter shall be
     deemed to be outstanding. Except as otherwise provided in subparagraph
     6D(3), no
<PAGE>
 
     adjustment of the Conversion Price shall be made upon the actual issue of
     such Common Stock or of such Convertible Securities upon exercise of such
     Options or upon the actual issue of such Common Stock upon conversion or
     exchange of such Convertible Securities.

               6D(2)  Issuance of Convertible Securities.  In case the
                      ----------------------------------              
     Corporation shall in any manner issue (whether directly or by assumption in
     a merger or otherwise) or sell any Convertible Securities, whether or not
     the rights to exchange or convert any such Convertible Securities are
     immediately exercisable, and the price per share for which Common Stock is
     issuable upon such conversion or exchange (determined by dividing (i) the
     total amount received or receivable by the Corporation as consideration for
     the issue or sale of such Convertible Securities, plus the minimum
     aggregate amount of additional consideration, if any, payable to the
     Corporation upon the conversion or exchange thereof, by (ii) the total
     maximum number of shares of Common Stock issuable upon the conversion or
     exchange of all such Convertible Securities) shall be less than the
     Conversion Price in effect immediately prior to the time of such issue or
     sale, then the total maximum number of shares of Common Stock issuable upon
     conversion or exchange of all such Convertible Securities shall be deemed
     to have been issued for such price per share as of the date of the issue or
     sale of such Convertible Securities and thereafter shall be deemed to be
     outstanding, provided that (a) except as otherwise provided in subparagraph
     6D(3), no adjustment of the Conversion Price shall be made upon the actual
     issue of such Common Stock upon conversion or exchange of such Convertible
     Securities and (b) if any such issue or sale of such Convertible Securities
     is made upon exercise of any Options to purchase any such Convertible
     Securities for which adjustments of the Conversion Price have been or are
     to be made pursuant to other provisions of this subparagraph 6D, no further
     adjustment of the Conversion Price shall be made by reason of such issue or
     sale.

               6D(3)  Change in Option Price or Conversion Rate.  Upon the
                      -----------------------------------------           
     happening of any of the following events, namely, if the purchase price
     provided for in any Option referred to in subparagraph 6D(1), the
     additional consideration, if any, payable upon the conversion or exchange
     of any Convertible Securities referred to in subparagraph 6D(1) or 6D(2),
     or the rate at which Convertible Securities referred to in subparagraph
     6D(1) or 6D(2) are convertible into or exchangeable for Common Stock shall
     change at any time (including, but not limited to, changes under or by
     reason of provisions designed to protect against dilution), the Conversion
     Price in effect at the time of such event shall forthwith be readjusted to
     the Conversion Price which would have been in effect at such time had such
     Options or Convertible Securities still outstanding provided for such
<PAGE>
 
     changed purchase price, additional consideration or conversion rate, as the
     case may be, at the time initially granted, issued or sold, but only if as
     a result of such adjustment the Conversion Price then in effect hereunder
     is thereby reduced; and on the expiration of any such Option or the
     termination of any such right to convert or exchange such Convertible
     Securities, the Conversion Price then in effect hereunder shall forthwith
     be increased to the Conversion Price which would have been in effect at the
     time of such expiration or termination had such Option or Convertible
     Securities, to the extent outstanding immediately prior to such expiration
     or termination, never been issued.

               6D(4)  Stock Dividends.  In case the Corporation shall declare a
                      ---------------                                          
     dividend or make any other distribution upon any stock of the Corporation
     payable in Common Stock (except for dividends or distributions upon the
     Common Stock), Options or Convertible Securities, any Common Stock, Options
     or Convertible Securities, as the case may be, issuable in payment of such
     dividend or distribution shall be deemed to have been issued or sold
     without consideration.

               6D(5)  Consideration for Stock.  In case any shares of Common
                      -----------------------                               
     Stock, Options or Convertible Securities shall be issued or sold for cash,
     the consideration received therefor shall be deemed to be the amount
     received by the Corporation therefor, without deduction therefrom of any
     expenses incurred or any underwriting commissions or concessions paid or
     allowed by the Corporation in connection therewith. In case any shares of
     Common Stock, Options or Convertible Securities shall be issued or sold for
     a consideration other than cash, the amount of the consideration other than
     cash received by the Corporation shall be deemed to be the fair value of
     such consideration as determined in good faith by the Board of Directors of
     the Corporation, without deduction of any expenses incurred or any
     underwriting commissions or concessions paid or allowed by the Corporation
     in connection therewith. In case any Options shall be issued in connection
     with the issue and sale of other securities of the Corporation, together
     comprising one integral transaction in which no specific consideration is
     allocated to such Options by the parties thereto, such Options shall be
     deemed to have been issued for such consideration as determined in good
     faith by the Board of Directors of the Corporation.

               6D(6)  Record Date.  In case the Corporation shall take a record
                      -----------                                              
     of the holders of its Common Stock for the purpose of entitling them (i) to
     receive a dividend or other distribution payable in Common Stock, Options
     or Convertible Securities or (ii) to subscribe for or purchase Common
     Stock, Options or Convertible Securities, then such record date shall be
     deemed to be the date of the issue or sale of
<PAGE>
 
     the shares of Common Stock deemed to have been issued or sold upon the
     declaration of such dividend or the making of such other distribution or
     the date of the granting of such right of subscription or purchase, as the
     case may be.

               6D(7)  Treasury Shares.  The number of shares of Common Stock
                      ---------------                                       
     outstanding at any given time shall not include shares owned or held by or
     for the account of the Corporation, and the disposition of any such shares
     shall be considered an issue or sale of Common Stock for the purpose of
     this subparagraph 6D.

          6E.  Certain Issues of Common Stock Excepted.  Anything herein to the
               ---------------------------------------                         
contrary notwithstanding, the Corporation shall not be required to make any
adjustment of the Conversion Price in the case of the issuance of (i) up to an
aggregate of 800,000 shares (appropriately adjusted to reflect the occurrence of
any event described in subparagraph 6F) of Common Stock to directors, officers,
employees or consultants of the Corporation in connection with their service to
the Corporation or their employment by the Corporation and (ii) shares of Common
Stock issued upon conversion of the Series A Convertible Preferred Stock. Any
shares of Common Stock issued pursuant to clause (i) of this subparagraph 6E
which are hereinafter repurchased by the Company at a purchase price per share
no greater than the price per share paid to the Company upon the issuance of
such shares shall again be available for issuance pursuant to clause (i) of this
subparagraph 6E .

          6F.  Subdivision or Combination of Common Stock.  In case the
               ------------------------------------------              
Corporation shall at any time subdivide (by any stock split, stock dividend or
otherwise) its outstanding shares of Common Stock into a greater number of
shares, the Conversion Price in effect immediately prior to such subdivision
shall be proportionately reduced, and, conversely, in case the outstanding
shares of Common Stock shall be combined into a smaller number of shares, the
Conversion Price in effect immediately prior to such combination shall be
proportionately increased.

          6G.  Reorganization or Reclassification.  If any capital
               ----------------------------------                 
reorganization or reclassification of the capital stock of the Corporation shall
be effected in such a way that holders of Common Stock shall be entitled to
receive stock, securities or assets with respect to or in exchange for Common
Stock, then, as a condition of such reorganization or reclassification, lawful
and adequate provisions shall be made whereby each holder of a share or shares
of Series A Convertible Preferred Stock shall thereupon have the right to
receive, upon the basis and upon the terms and conditions specified herein and
in lieu of the shares of Common Stock immediately theretofore receivable upon
the conversion of such share or shares of Series A Convertible Preferred Stock,
such shares of stock, securities or assets as may be issued or payable with
respect to or in exchange for a number of outstanding shares of such Common
Stock equal to the
<PAGE>
 
number of shares of such Common Stock immediately theretofore receivable upon
such conversion had such reorganization or reclassification not taken place, and
in any such case appropriate provisions shall be made with respect to the rights
and interests of such holder to the end that the provisions hereof (including
without limitation provisions for adjustments of the Conversion Price) shall
thereafter be applicable, as nearly as may be, in relation to any shares of
stock, securities or assets thereafter deliverable upon the exercise of such
conversion rights.

          6H.  Notice of Adjustment.  Upon any adjustment of the Conversion
               --------------------                                        
Price, then and in each such case the Corporation shall give written notice
thereof, by first class mail, postage prepaid, or by telex or telecopier to non-
U.S. residents, addressed to each holder of shares of Series A Convertible
Preferred Stock at the address of such holder as shown on the books of the
Corporation, which notice shall state the Conversion Price resulting from such
adjustment, setting forth in reasonable detail the method upon which such
calculation is based.

          6I.  Other Notices.  In case at any time:
               -------------                       

               (1)  the Corporation shall declare any dividend upon its Common
     Stock payable in cash or stock or make any other distribution to the
     holders of its Common Stock;

               (2)  the Corporation shall offer for subscription pro rata to the
                                                                 --- ----
     holders of its Common Stock any additional shares of stock of any class or
     other rights;

               (3)  there shall be any capital reorganization or
     reclassification of the capital stock of the Corporation, or a
     consolidation or merger of the Corporation with or into, or a sale of all
     or substantially all its assets to, another entity or entities; or

               (4)  there shall be a voluntary or involuntary dissolution,
     liquidation or winding up of the Corporation;

then, in any one or more of said cases, the Corporation shall give, by first
class mail, postage prepaid, or by telex or telecopier to non-U.S. residents,
addressed to each holder of any shares of Series A Convertible Preferred Stock
at the address of such holder as shown on the books of the Corporation, (a) at
least 20 days' prior written notice of the date on which the books of the
Corporation shall close or a record shall be taken for such dividend,
distribution or subscription rights or for determining rights to vote in respect
of any such reorganization, reclassification, consolidation, merger, sale,
dissolution, liquidation or winding up and (b) in the case of any such
reorganization, reclassification, consolidation, merger, sale, dissolution,
liquidation or winding up, at least 20 days, prior written notice of the date
when the same shall take place. Such
<PAGE>
 
notice in accordance with the foregoing clause (a) shall also specify, in the
case of any such dividend, distribution or subscription rights, the date on
which the holders of Common Stock shall be entitled thereto and such notice in
accordance with the foregoing clause (b) shall also specify the date on which
the holders of Common Stock shall be entitled to exchange their Common Stock for
securities or other property deliverable upon such reorganization,
reclassification, consolidation, merger, sale, dissolution, liquidation or
winding up, as the case may be.

          6J.  Stock to be Reserved.  The Corporation will at all times reserve
               --------------------                                            
and keep available out of its authorized Common Stock, solely for the purpose of
issuance upon the conversion of Series A Convertible Preferred Stock as herein
provided, such number of shares of Common Stock as shall then be issuable upon
the conversion of all outstanding shares of Series A Convertible Preferred
Stock.  The Corporation covenants that all shares of Common Stock which shall be
so issued shall be duly and validly issued and fully paid and nonassessable and
free from all taxes, liens and charges with respect to the issue thereof, and,
without limiting the generality of the foregoing, the Corporation covenants that
it will from time to time take all such action as may be requisite to assure
that the par value per share of the Common Stock is at all times equal to or
less than the Conversion Price in effect at the time.  The Corporation will take
all such action as may be necessary to assure that all such shares of Common
Stock may be so issued without violation of any applicable law or regulation, or
of any requirement of any national securities exchange upon which the Common
Stock may be listed.  The Corporation will not take any action which results in
any adjustment of the Conversion Price if the total number of shares of Common
Stock issued and issuable after such action upon conversion of the Series A
Convertible Preferred Stock would exceed the total number of shares of Common
Stock then authorized by its Certificate of Incorporation.

          6K.  No Reissuance of Series A Convertible Preferred Stock.  Shares of
               -----------------------------------------------------            
Series A Convertible Preferred Stock which are converted into shares of Common
Stock as provided herein shall not be reissued.

          6L.  Issue Tax.  The issuance of certificates for shares of Common
               ---------                                                    
Stock upon conversion of Series A Convertible Preferred Stock shall be made
without charge to the holders thereof for any issuance tax in respect thereof,
provided that the Corporation shall not be required to pay any tax which may be
payable in respect of any transfer involved in the issuance and delivery of any
certificate in a name other than that of the holder of the Series A Convertible
Preferred Stock which is being converted.

          6M.  Closing of Books.  The Corporation will at no time close its
               ----------------                                            
transfer books against the transfer of any Series A
<PAGE>
 
Convertible Preferred Stock or of any shares of Common Stock issued or issuable
upon the conversion of any shares of Series A Convertible Preferred Stock in any
manner which interferes with the timely conversion of such Series A Convertible
Preferred Stock, except as may otherwise be required to comply with applicable
securities laws.

          6N.  Definition of Common Stock.  As used in this paragraph 6, the
               --------------------------                                   
term "Common Stock shall mean and include the Corporation's authorized Common
Stock, par value $.01 per share, as constituted on the date of filing of these
terms of the Series A Convertible Preferred Stock, and shall also include any
capital stock of any class of the Corporation thereafter authorized which shall
neither be limited to a fixed sum or percentage of par value in respect of the
rights of the holders thereof to participate in dividends nor entities to a
preference in the distribution of assets upon the voluntary or involuntary
liquidation, dissolution or winding up of the Corporation; provided that the
shares of Common Stock receivable upon conversion of shares of Series A
Convertible Preferred Stock shall include only shares designated as Common Stock
of the Corporation on the date of filing of this instrument, or in case of any
reorganization or reclassification of the outstanding shares thereof, the stock,
securities or assets provided for in subparagraph 6C.

          6O.  Mandatory Conversion.  If at any time (A) the Corporation shall
               --------------------                                           
effect a firm commitment underwritten public offering of shares of Common Stock
in which (i) the aggregate price paid for such shares by the public shall be at
least $7,500,000 and (ii) the price paid by the public for such shares shall be
at least $4.75 per share (appropriately adjusted to reflect the occurrence of
any event described in subparagraph 6F) or (B) there shall be less than twenty
percent (20%) of the originally issued shares of Series A Convertible Preferred
Stock outstanding, then effective upon the closing of the sale of such shares by
the Corporation pursuant to such public offering or such reduction in the number
of outstanding shares of Series A Convertible Preferred Stock, as the case may
be, all outstanding shares of Series A Convertible Preferred Stock shall
automatically and without any further action on the part of the Corporation
convert to shares of Common Stock.

     7.   Redemption.  The shares of Series A Convertible Preferred Stock shall
          ----------                                                           
be redeemed as follows:

          7A.  Mandatory Redemption.  On December 31, 1997 (the "Redemption
               --------------------                                        
Date"), the Corporation shall redeem from each holder of shares of Series A
Convertible Preferred Stock out of funds legally available therefor, all of the
shares of Series A Convertible Preferred Stock held by such holder on the
Redemption Date.
<PAGE>
 
          7B.  Redemption Price and Payment.  The Series A Convertible Preferred
               ----------------------------                                     
Stock to be redeemed on the Redemption Date shall be redeemed by paying for each
share in cash an amount equal to the greater of (i) the Liquidation Preference
Payment and (ii) the Fair Market Value as of September 30, 1997, such amount
being referred to as the "Redemption Price".  Such payment shall be made in
full on the Redemption Date to the holders entitled thereto.

          7C.  Redemption Mechanics.  At least ten (10) but not more than ninety
               --------------------                                             
(90) days prior to the Redemption Date, written notice (the "Redemption Notice")
shall be given by the Corporation by mail, postage prepaid, or by telex or
telecopier to non-U.S. residents, to each holder of record (at the close of
business on the business day next preceding the day on which the Redemption
Notice is given) of shares of Series A Convertible Preferred Stock notifying
such holder of the redemption and specifying the Redemption Price, the
Redemption Date and the place where said Redemption Price shall be payable.  The
Redemption Notice shall be addressed to each holder at his address as shown by
the records of the Corporation.  From and after the close of business on the
Redemption Date, unless there shall have been a default in the payment of the
Redemption Price, all rights of holders of shares of Series A Convertible
Preferred Stock (except the right to receive the Redemption Price) shall cease
with respect to such shares, and such shares shall not thereafter be transferred
on the books of the Corporation or be deemed to be outstanding for any purpose
whatsoever.  If the funds of the Corporation legally available for redemption of
shares of Series A Convertible Preferred Stock on the Redemption Date are
insufficient to redeem the total number of outstanding shares of Series A
Convertible Preferred Stock, the holders of shares of Series A Convertible
Preferred Stock shall share ratably in any funds legally available for
redemption of such shares according to the respective amounts which would be
payable with respect to the full number of shares owned by them if all such
outstanding shares were redeemed in full.  The shares of Series A Convertible
Preferred Stock not redeemed shall remain outstanding and entitled to all rights
and preferences provided herein.  At any time thereafter when additional funds
of the Corporation are legally available for the redemption of such shares of
Series A Convertible Preferred Stock, such funds will be used, at the end of the
next succeeding fiscal quarter, to redeem the balance of such shares, or such
portion thereof for which funds are then legally available, on the basis set
forth above.

          7D.  Fair Market Value.  For the purposes of this paragraph 7, "Fair
               -----------------                                              
Market Value" per share of Series A Convertible Preferred Stock shall mean:

               7D(1) if the Company's Common Stock is publicly traded, an amount
     (A) equal to (x) the average on September 30, 1997 of the high and low
     prices of the Common Stock on
<PAGE>
 
     the principal national securities exchange on which the Common Stock is
     traded, if such stock is then traded on a national securities exchange; or
     (y) the last reported sale price on September 30, 1997 of the Common Stock
     on the NASDAQ National Market List, if the Common Stock is not then traded
     on a national securities exchange; or (z) the closing bid price (or average
     of bid prices) last quoted on September 30, 1997 by an established
     quotation service for over-the-counter securities, if the Common Stock is
     not reported on the NASDAQ National Market List, (B) multiplied by the
     number of shares of Common Stock (including fractions of a share) into
     which each share of Series A Convertible Preferred Stock may be converted
     as of September 30, 1997; or

               7D(2) if the Company's Common Stock is not publicly traded as
     provided in subparagraph 7(D)(1) above, an amount (A) determined by
     dividing the Company's Fair Market Value, determined as of September 30,
     1997, by the number of actual outstanding shares of Common Stock, on a
     fully-diluted basis, as of September 30, 1997, (B) multiplied by the number
     of shares of Common Stock (including fractions of a share) into which each
     share of Series A Convertible Preferred Stock may be converted as of
     September 30, 1997.  The Company's Fair Market Value shall be the price
     which could be obtained for one hundred percent (100%) of the equity
     interest in the Company on a consolidated basis if the Company were sold to
     a willing buyer by a willing seller in a single arm's-length transaction,
     determined by considering the Company's profits after tax, book value,
     revenues and cash flow as of September 30, 1997.

     In the event that the Fair Market Value per share of Common Stock is to be
     determined pursuant to subparagraph 7D(2) above then, in such event, on or
     before October 31 1997, a representative of the Company and a
     representative of the holder or holders of a majority of the then
     outstanding shares of Series A Convertible Preferred Stock will use their
     best efforts to reach agreement on the Company's Fair Market Value. If they
     are unable to reach such agreement within ten (10) days after the end of
     such period, the Company and such holder or holders will agree on the
     selection of an independent appraiser. Such appraiser will have fifteen
     (15) days in which to determine the Company's Fair Market Value, and its
     determination thereof will be final and binding on all parties concerned.
     If the Company and such holder or holders are unable to reach an agreement
     as to an independent appraiser within five (5) days after the aforesaid ten
     (10) day period, then two appraisers will be appointed within five (5) days
     thereafter to determine the Company's Fair Market Value, one by the Company
     and one by the holder or holders of a majority of the then outstanding
     shares of Series A Convertible Preferred Stock. Each of the Company and
     such holder or holders will cause their appraiser to determine
     independently the
<PAGE>
 
     Company's Fair Market Value within fifteen (15) days after the time of
     their appointment. If the lesser of the two appraised values so determined
     (the "Low Value") exceeds or is equal to ninety percent (90%) of the value
     of the greater of the two appraised values (the "High Value"), the
     Company's Fair Market Value will be deemed to be equal to the average of
     the two appraisals. If the Low Value is less than ninety percent (90%) of
     the High Value, the two appraisers will themselves appoint a third
     appraiser within five (5) days after the two appraisals have been rendered.
     Such third appraiser will have fifteen (15) days in which to determine
     independently the Company's Fair Market Value. The median of the three (3)
     appraised values shall be binding on all parties concerned as the Company's
     Fair Market Value. The expenses of the appraisal will be borne solely by
     the Company.

          7E.  Additional Payments Upon Merger, Etc.  If at any time within one
               -------------------------------------                           
     year after the date of redemption provided for in paragraph 7A, the Company
     shall become party to one or more mergers, consolidations, sales of all or
     substantially all of its assets or other similar corporate actions pursuant
     to which the holders of the Company's Common Stock receive cash, securities
     or other property, or the Company is acquired by the purchase of a majority
     of its shares of Common Stock, or the Company or its stockholders enter
     into any agreement or letter of intent contemplating any of the foregoing
     transactions, the Company shall, simultaneously with the consummation of
     any such transaction or at such later time as any payment described below
     is received by the Company or its stockholders, make an additional payment
     to the holder or holders whose shares of Series A Convertible Preferred
     Stock were so redeemed by the Company in an amount equal to the excess, if
     any, of the value per share of the cash, securities and other property that
     such holder or holders would have received (or that the Company received in
     which such holder or holders would have had a beneficial interest) had the
     shares of Series A Convertible Preferred Stock not been redeemed pursuant
     to paragraph 7A, over the payment received by such holder or holders with
     respect to such shares of Series A Convertible Preferred Stock. Each
     payment made to such holder or holders pursuant to this subparagraph 7E
     shall be made either in cash or in the form of the securities and other
     property received by the holders of shares of Common Stock of the Company.

          7F.  Redeemed or Otherwise Acquired Shares to be Retired.  Any shares
               ---------------------------------------------------             
     of Series A Convertible Preferred Stock redeemed pursuant to this paragraph
     7 or otherwise acquired by the Corporation in any manner whatsoever shall
     be cancelled and shall not under any circumstances be reissued; and the
     Corporation may from time to time take such appropriate corporate action as
     may be necessary to reduce accordingly the number of authorized shares of
     Series A Convertible Preferred Stock.
<PAGE>
 
     8.   Amendments.  No provision of these terms of the Series A Convertible
          ----------                                                          
Preferred Stock may be amended, modified or waived without the written consent
or affirmative vote of the holders of at least two-thirds of the then
outstanding shares of Series A Convertible Preferred Stock.

     IN WITNESS WHEREOF, Credit Technologies, Inc. has caused this certificate
to be signed by its President and attested by its Secretary this eighth day of
February, 1991.


                                    CREDIT TECHNOLOGIES, INC.


                                    By: /s/ Pamela D. A. Reeve
                                       --------------------------
                                        Its President


ATTEST


By: /s/ John D. Patterson, Jr.
   ---------------------------
    Its Secretary
<PAGE>
 
                            CERTIFICATE OF AMENDMENT

                                       OF

                          CERTIFICATE OF INCORPORATION

                                       OF

                           CREDIT TECHNOLOGIES, INC.

     Credit Technologies, Inc., a corporation organized and existing under and
by virtue of the General Corporation Law of the State of Delaware (the
"Corporation"), DOES HEREBY CERTIFY:

     That the following amendment to the Certificate of Incorporation of the
Corporation dated June 16, 1989, as amended on November 13, 1990, December 20,
1990 and February 11, 1991, has been duly adopted in accordance with the
provisions of Section 242 of the Delaware General Corporation Law:

     That the Certificate of Incorporation of the Corporation be amended by
deleting the old Article Fourth and inserting a new Article Fourth in its stead
which shall be and read as follows in its entirety:

     FOURTH:  The total number of shares of capital stock which the Corporation
shall have the authority to issue shall be 7,250,516 shares, of which 6,000,000
shall be shares of common stock, each of which shall have a par value of $.01
(the "Common Stock"), and 1,250,516 shall be shares of preferred stock, each of
which shall have a par value of $.01 (the "Preferred Stock"), amounting to an
aggregate par value of $72,505.16.

     The following is a statement of the designations, powers, preferences and
rights, and the qualifications, limitations and restrictions, granted to or
imposed upon the respective classes of shares of capital stock of the
Corporation or the holders thereof:

               SERIES A AND SERIES B CONVERTIBLE PREFERRED STOCK

     1.   Number of Shares.  The series of Preferred Stock designated and known
          ----------------                                                     
as "Series A Convertible Preferred Stock" shall consist of 630,516 shares.  The
series of Preferred Stock
<PAGE>
 
designated and known as the "Series B Convertible Preferred Stock" shall consist
of 620,0000 shares.  The term "Preferred Stock" used without reference to the
Series A Convertible Preferred Stock or the Series B Convertible Preferred Stock
means both the Series A Convertible Preferred Stock and the Series B Convertible
Preferred Stock, share for share alike without distinction as to series except
as otherwise expressly provided or as the context otherwise requires.

     2.   Voting.
          ------ 

          2A.  General.  Except as may be otherwise provided in these terms of
               -------                                                        
the Preferred Stock or by law, the Preferred Stock shall vote together with all
other classes and series of stock of the Corporation as a single class on all
actions to be taken by the stockholders of the Corporation, including, without
limitation, the election of directors of the Corporation.  Notwithstanding the
foregoing or anything else to the contrary provided in the Certificate of
Incorporation, if the Corporation fails or refuses, for any reason or for no
reason, to redeem on the Redemption Date (as defined in paragraph 7) all of the
then outstanding shares of Preferred Stock in accordance with the terms and
provisions of paragraph 7, the holders of the Preferred Stock, voting together
as a single series, shall be entitled to elect a majority of the directors of
the Corporation.  Each share of Preferred Stock shall entitle the holder thereof
to such number of votes per share on each such action as shall equal the number
of shares of Common Stock (including fractions of a share) into which each such
share of Preferred Stock is then convertible.

          2B.  Board Size.  The Corporation shall not, without the written
               ----------                                                 
consent or affirmative vote of the holders of at least two-thirds of the then
outstanding shares of Preferred Stock, given in writing or by vote at a meeting,
consenting or voting (as the case may be) together as a single series, increase
the maximum number of directors constituting the Board of Directors to a number
in excess of seven.

     3.   Dividends.  Commencing on and from October 1, 1992, the holders of the
          ---------                                                             
Series A Convertible Preferred Stock shall be entitled to receive, out of funds
legally available therefor, annual dividends at the rate per annum or $.127 per
share, and the holders of the Series B Convertible Preferred Stock shall be
entitled to receive, out of funds legally available therefor, annual dividends
at the rate per annum of $.14 per share (annually an "Accrued Dividend" and
collectively the "Accruing Dividends"), such payments to be made (except as
hereinafter provided) on the last day of December in each year for the period
ended on the immediately prior September 30, with the first such dividend being
paid on December 31, 1993 for the period ended September 30, 1993. Accruing
Dividends shall accrue from day to day, whether or not earned or declared, and
shall be cumulative. The Board of Directors may defer paying an Accruing
Dividend on
<PAGE>
 
both the Series A Convertible Preferred Stock and the Series B Convertible
Preferred Stock for a period ended September 30 to the extent that for the
Corporation's fiscal year ended such September 30 it had consolidated net income
of less than $500,000.  To the extent that the Corporation has deferred paying
an Accrued Dividend, such Accrued Dividend shall be paid on the first December
31 thereafter in which the Corporation's consolidated net income for the
immediately prior September 30 equals or exceeds $500,000.  Payment of deferred
Accrued Dividends shall be made at the rate of one deferred Accrued Dividend for
each $500,000 of consolidated net income in excess of the first $500,000.  For
the purposes of this paragraph 3, consolidated net income shall be determined in
accordance with generally accepted accounting principles, consistently applied.

     4.   Liquidation.  Upon any liquidation, dissolution or winding up of the
          -----------                                                         
Corporation, whether voluntary or involuntary, the holders of the shares of
Preferred Stock shall first be entitled, before any distribution or payment is
made upon any stock ranking on liquidation junior to the Preferred Stock, to be
paid an amount equal to the greater of (i) $1.586 per share in the case of each
share of Series A Convertible Preferred Stock and $1.75 per share in the case
of each such share of Series B Convertible Preferred Stock, plus, in the case of
each share, an amount equal to all Accruing Dividends unpaid thereon (whether or
not declared) and any other dividends declared but unpaid thereon, computed to
the date payment thereof is made available, or (ii) such amount per share as
would have been payable had each such share of Preferred Stock been converted to
Common Stock pursuant to paragraph 6 immediately prior to such liquidation,
dissolution or winding up, and the holders of Preferred Stock shall not be
entitled to any further payment, such amount payable with respect to one share
of Preferred Stock being sometimes referred to as the "Liquidation Preference
Payment" and with respect to all shares of Preferred Stock being sometimes
referred to as the "Liquidation Preference Payments."  If upon such liquidation,
dissolution or winding up of the Corporation, whether voluntary or involuntary,
the assets to be distributed among the holders of Preferred Stock shall be
insufficient to permit payment in full to the holders of Preferred Stock of the
Liquidation Preference Payments, then the entire assets of the Corporation to be
so distributed shall be distributed ratably, based upon Liquidation Payments,
among the holders of Preferred Stock.  Upon any such liquidation, dissolution or
winding up of the Corporation, immediately after the holders of Preferred Stock
shall have been paid in full the Liquidation Preference Payments, the remaining
net assets of the Corporation available for distribution may be distributed
ratably among the holders of Common Stock.  Written notice of such liquidation,
dissolution or winding up, stating a payment date and the place where said
payments shall be made, shall be given by mail, postage prepaid, or by telex to
non-U.S. residents, not less than 20 days prior to the payment date stated
therein, to the holders of record of Preferred Stock, such notice to be
addressed to each such holder
<PAGE>
 
at its address as shown by the records of the Corporation.  The consolidation or
merger of the Corporation into or with any other entity or entities which
results in the exchange of outstanding shares of the Corporation for securities
or other consideration issued or paid or caused to be issued or paid by any such
entity or affiliate thereof (excluding any consolidation or merger in which the
shareholders of the Corporation hold more than fifty percent (50%) of the voting
securities of the surviving corporation), and the sale or transfer by the
Corporation of all or substantially all its assets, shall be deemed to be a
liquidation, dissolution or winding up of the Corporation within the meaning of
the provisions of this paragraph 4. For purposes hereof, the Common Stock shall
rank in liquidation junior to the Preferred Stock.

     5.   Restrictions.  At any time when shares of Preferred Stock are
          ------------                                                 
outstanding, except where the vote or written consent of the holders of a
greater number of shares of the Corporation is required by law or by the
Certificate of Incorporation, and in addition to any other vote required by law
or the Certificate of incorporation, without the approval of the holders of at
least two-thirds of the then outstanding shares of Preferred Stock, given in
writing or by vote at a meeting, consenting or voting (as the case may be)
together as a single series, the Corporation will not:

          5A.  Create or authorize the creation of any additional class or
series of shares of stock unless the same ranks junior to the Preferred Stock as
to the distribution of assets on the liquidation, dissolution or winding up of
the Corporation, or increase the authorized amount of the Series A Convertible
Preferred Stock or Series B Convertible Preferred Stock or increase the
authorized amount of any additional class or series of shares of stock unless
the same ranks junior to the Preferred Stock as to the distribution of assets on
the liquidation, dissolution or winding up of the Corporation, or create or
authorize any obligation or security convertible into shares of Series A
Convertible Preferred Stock or Series B Convertible Preferred Stock or
into shares of any other class or series of stock unless the same ranks junior
to the Preferred Stock as to the distribution of assets on the liquidation,
dissolution or winding up of the Corporation, whether any such creation,
authorization or increase shall be by means of amendment to the Certificate of
Incorporation or by merger, consolidation or otherwise;

          5B.  Consent to any liquidation, dissolution or winding up of the
Corporation or consolidate or merge into or with any other entity or entities or
sell or transfer all or substantially all its assets;

          5C.  Amend, alter or repeal its Certificate of Incorporation or By-
laws so as to adversely affect the rights of
<PAGE>
 
the holders of the Series A Convertible Preferred Stock or the Series B
Convertible Preferred Stock;

          5D.  Purchase or set aside any sums for the purchase of, or pay any
dividend or make any distribution on, any shares of stock other than the
Preferred Stock, except for dividends or other distributions payable on the
Common Stock solely in the form of additional shares of Common Stock and except
for the purchase of shares of Common Stock from former employees of the
corporation who acquired such shares directly from the Corporation, if each such
purchase is made pursuant to contractual rights held by the Corporation relating
to the termination of employment of such former employee and the purchase price
does not exceed the original issue price paid by such former employee to the
corporation for such shares; or

          5E.  Redeem or otherwise acquire any shares of Preferred Stock except
as expressly authorized in paragraph 7 hereof or pursuant to a purchase offer
made pro rata to all holders of shares of Preferred Stock on the basis of the
aggregate number of outstanding shares of Preferred Stock then held by each such
holder.

     6.   Conversions.  The holders of shares of Preferred Stock shall have the
          -----------                                                          
following conversion rights:

          6A.  Right to Convert.  Subject to the terms and conditions of this
               ----------------                                              
paragraph 6, the holder of any share or shares of Preferred Stock shall have the
right, at its option at any time, to convert any such shares of Preferred Stock
(except that upon any liquidation of the Corporation the right of conversion
shall terminate at the close of business on the business day fixed for payment
of the amount distributable on the Preferred Stock) into such number of fully
paid and nonassessable shares of Common Stock as is obtained by (A) in the case
of the Series A Convertible Preferred Stock, (i) multiplying the number of
shares of Series A Convertible Preferred Stock so to be converted by $1.586 and
(ii) dividing the result by the conversion price of $1.586 per share or, in case
an adjustment of such price has taken place pursuant to the further provisions
of this paragraph 6, then by the conversion price as last adjusted and in effect
at the date any share or shares of Series A Convertible Preferred Stock are
surrendered for conversion, and (B) in the case of the Series B Convertible
Preferred Stock, (i) multiplying the number of shares of Series B Convertible
Preferred Stock so to be converted by $1.75 and (ii) dividing the result by the
conversion price of $1.75 per share or, in case an adjustment of such price has
taken place pursuant to the further provisions of this paragraph 6, then by the
conversion price as last adjusted and in effect at the date any share or shares
of Series B Convertible Preferred Stock are surrendered for conversion.  The
conversion price set forth in clause A(ii) and clause B(ii) hereof or such price
as last adjusted, being referred to as the "Conversion Price".  Such rights of
conversion shall be exercised by the
<PAGE>
 
holder thereof by giving written notice that the holder elects to convert a
stated number of shares of Preferred Stock into Common Stock and by surrender of
a certificate or certificates for the shares so to be converted to the
Corporation at its principal office (or such other office or agency of the
Corporation as the Corporation may designate by notice in writing to the holders
of the Preferred Stock) at any time during its usual business hours on the date
set forth in such notice, together with a statement of the name or names (with
address) in which the certificate or certificates for shares of Common Stock
shall be issued.

          6B.  Issuance of Certificates; Time Conversion Effected.  Promptly
               --------------------------------------------------           
after the receipt of the written notice referred to in subparagraph 6A and
surrender of the certificate or certificates for the share or shares of
Preferred Stock to be converted, the Corporation shall issue and deliver, or
cause to be issued and delivered, to the holder, registered in such name or
names as such holder may direct, a certificate or certificates for the number of
whole shares of Common Stock issuable upon the conversion of such share or
shares of Preferred Stock.  To the extent permitted by law, such conversion
shall be deemed to have been effected and the Conversion Price shall be
determined as of the close of business on the date on which such written notice
shall have been received by the Corporation and the certificate or certificates
for such share or shares shall have been surrendered as aforesaid, and at such
time the rights of the holder of such share or shares of Preferred Stock shall
cease, and the person or persons in whose name or names any certificate or
certificates for shares of Common Stock shall be issuable upon such conversion
shall be deemed to have become the holder or holders of record of the shares
represented thereby.

          6C.  Fractional Shares; Dividends; Partial Conversion.  No fractional
               ------------------------------------------------                
shares shall be issued upon conversion of Preferred Stock into Common Stock and
no payment or adjustment shall be made upon any conversion on account of any
cash dividends on the Common Stock issued upon such conversion.  At the time of
each conversion, the Corporation shall pay, out of assets legally available
therefor, in cash an amount equal to all dividends, excluding Accruing
Dividends, declared and unpaid on the shares of Preferred Stock surrendered for
conversion to the date upon which such conversion is deemed to take place as
provided in subparagraph 6B. In case the number of shares of Preferred Stock
represented by the certificate or certificates surrendered pursuant to
subparagraph 6A exceeds the number of shares converted the Corporation shall,
upon such conversion execute and deliver to the holder, at the expense of the
Corporation, a new certificate or certificates for the number of shares of
Preferred Stock represented by the certificate or certificates surrendered which
are not to be converted. If any fractional share of Common Stock would, except
for the provisions of the first sentence of this subparagraph 6C, be delivered
upon such conversion, the Corporation, in lieu of delivering such fractional
share, shall pay to the holder surrendering the Preferred Stock for conversion
<PAGE>
 
an amount in cash equal to the current market price of such fractional share as
determined in good faith by the Board of Directors of the Corporation.

          6D.  Adjustment of Price Upon Issuance of Common Stock.  Except as
               -------------------------------------------------            
provided in subparagraph 6E, if and whenever the Corporation shall issue or
sell, or is, in accordance with subparagraphs 6D(l) through 6D(7), deemed to
have issued or sold, any shares of Common Stock for a consideration per share
less than the Conversion Price in effect immediately prior to the time of such
issue or sale, then, forthwith upon such issue or sale, the Conversion Price
shall be reduced to the price determined by dividing (i) an amount equal to the
sum of (a) the number of shares of Common Stock outstanding immediately prior to
such issue or sale (including the number of shares of Common Stock then issued
or issuable upon conversion of all issued and outstanding shares of Preferred
Stock) multiplied by the then existing Conversion Price and (b) the
consideration, if any, received by the Corporation upon such issue or sale, by
(ii) the total number of shares of Common Stock outstanding immediately after
such issue or sale (including the number of shares of Common Stock then issued
or issuable upon conversion of all issued and outstanding shares of Preferred
Stock).

     For purposes of this subparagraph 6D, the following subparagraphs 6D(l) to
6D(7) shall also be applicable:

               6D(1)  Issuance of Rights or Options.  In case at any time the
                      -----------------------------                          
     Corporation shall in any manner grant (whether directly or by assumption in
     a merger or otherwise) any warrants or other rights to subscribe for or to
     purchase, or any options for the purchase of, Common Stock or any stock or
     security convertible into or exchangeable for Common Stock (such warrants,
     rights or options being called "Options" and such convertible or
     exchangeable stock or securities being called "Convertible Securities")
     whether or not such Options or the right to convert or exchange any such
     Convertible Securities are immediately exercisable, and the price per share
     for which Common Stock is issuable upon the exercise of such Options or
     upon the conversion or exchange of such Convertible Securities (determined
     by dividing (i) the total amount, if any, received or receivable by the
     Corporation as consideration for the granting of such options, plus the a
     minimum aggregate amount of additional consideration payable to the
     Corporation upon the exercise of all such options, plus, in the case of
     such Options which relate to Convertible Securities, the minimum aggregate
     amount of additional consideration, if any, payable upon the issue or sale
     of such Convertible Securities and upon the conversion or exchange thereof,
     by (ii) the total maximum number of shares of Common Stock issuable upon
     the exercise of such Options or upon the conversion or exchange of all such
     Convertible Securities issuable upon the exercise of such Options) shall
<PAGE>
 
     be less than the Conversion Price in effect immediately prior to the time
     of the granting of such options then the total maximum number of shares of
     Common Stock issuable upon the exercise of such Options or upon conversion
     or exchange of the total maximum amount of such Convertible Securities
     issuable upon the exercise of such Options shall be deemed to have been
     issued for such price per share as of the date of granting of such Options
     or the issuance of such Convertible Securities and thereafter shall be
     deemed to be outstanding.  Except as otherwise provided in subparagraph
     6D(3), no adjustment of the Conversion Price shall be made upon the actual
     issue of such Common Stock or of such Convertible Securities upon exercise
     of such Options or upon the actual issue of such Common Stock upon
     conversion or exchange of such Convertible Securities.

               6D(2)  Issuance of Convertible Securities.  In case the
                      ----------------------------------              
     Corporation shall in any manner issue (whether directly or by assumption in
     a merger or otherwise) or sell any Convertible Securities, whether or not
     the rights to exchange or convert any such Convertible Securities are
     immediately exercisable, and the price per share for which Common Stock is
     issuable upon such conversion or exchange (determined by dividing (i) the
     total amount received or receivable by the Corporation as consideration for
     the issue or sale of such Convertible Securities, plus the minimum
     aggregate amount of additional consideration, if any, payable to the
     Corporation upon the conversion or exchange thereof, by (ii) the total
     maximum number of shares of Common Stock issuable upon the conversion or
     exchange of all such Convertible Securities) shall be less than the
     Conversion Price in effect immediately prior to the time of such issue or
     sale, then the total maximum number of shares of Common Stock issuable upon
     conversion or exchange of all such Convertible Securities shall be deemed
     to have been issued for such price per share as of the date of the issue or
     sale of such Convertible Securities and thereafter shall be deemed to be
     outstanding, provided that (a) except as otherwise provided in subparagraph
     6D(3), no adjustment of the Conversion Price shall be made upon the actual
     issue of such Common Stock upon conversion or exchange of such Convertible
     Securities and (b) if any such issue or sale of such Convertible Securities
     is made upon exercise of any Options to purchase any such Convertible
     Securities for which adjustments of the Conversion Price have been or are
     to be made pursuant to other provisions of this subparagraph 6D, no further
     adjustment of the Conversion Price shall be made by reason of such issue or
     sale.

               6D(3)  Change in Option Price or Conversion Rate.  Upon the
                      -----------------------------------------           
     happening of any of the following events, namely, if the purchase price
     provided for in any Option referred to in subparagraph 6D(l), the
     additional consideration, if any, payable upon the conversion or exchange
     of any Convertible
<PAGE>
 
     Securities referred to in subparagraph 6D(l) or 6D(2), or the rate at which
     Convertible Securities referred to in subparagraph 6D(l) or 6D(2) are
     convertible into or exchangeable for Common Stock shall change at any time
     (including, but not limited to, changes under or by reason of provisions
     designed to protect against dilution), the Conversion Price in effect at
     the time of such event shall forthwith be readjusted to the Conversion
     Price which would have been in effect at such time had such Options or
     Convertible Securities still outstanding provided for such changed
     purchase price, additional consideration or conversion rate, as the case
     may be, at the time initially granted, issued or sold, but only if as a
     result of such adjustment the Conversion Price then in effect hereunder is
     thereby reduced; and on the expiration of any such Option or the
     termination of any such right to convert or exchange such Convertible
     Securities, the Conversion Price then in effect hereunder shall forthwith
     be increased to the Conversion Price which would have been in effect at the
     time of such expiration or termination had such Option or Convertible
     Securities, to the extent outstanding immediately prior to such expiration
     or termination, never been issued.

               6D(4)  Stock Dividends.  In case the Corporation shall declare a
                      ---------------                                          
     dividend or make any other distribution upon any stock of the Corporation
     payable in Common Stock (except for dividends or distributions upon the
     Common Stock), Options or Convertible Securities, any Common Stock, Options
     or Convertible Securities, as the case may be, issuable in payment of such
     dividend or distribution shall be deemed to have been issued or sold
     without consideration.

               6D(5)  Consideration for Stock.  In case any shares of Common
                      -----------------------                               
     Stock, Options or Convertible Securities shall be issued or sold for cash,
     the consideration received therefor shall be deemed to be the amount
     received by the Corporation therefor, without deduction therefrom of any
     expenses incurred or any underwriting commissions or concessions paid or
     allowed by the Corporation in connection therewith.  In case any shares of
     Common Stock, Options or Convertible Securities shall be issued or sold for
     a consideration other than cash, the amount of the consideration other than
     cash received by the Corporation shall be deemed to be the fair value of
     such consideration as determined in good faith by the Board of Directors of
     the Corporation, without deduction of any expenses incurred or any
     underwriting commissions or concessions paid or allowed by the Corporation
     in connection therewith.  In case any Options shall be issued in connection
     with the issue and sale of other securities of the Corporation, together
     comprising one integral transaction in which no specific consideration is
     allocated to such Options by the parties thereto, such Options shall be
     deemed to have been issued
<PAGE>
 
     for such consideration as determined in good faith by the Board of
     Directors of the Corporation.

               6D(6)  Record Date.  In case the Corporation shall take a record
                      -----------                                              
     of the holders of its Common Stock for the purpose of entitling them (i) to
     receive a dividend or other distribution payable in Common Stock, Options
     or Convertible Securities or (i) to subscribe for or purchase Common
     Stock, Options or Convertible Securities, then such record date shall be
     deemed to be the date of the issue or sale of the shares of Common Stock
     deemed to have been issued or sold upon the declaration of such dividend or
     the making of such other distribution or the date of the granting of such
     right of subscription or purchase, as the case may be.

               6D(7)  Treasury Shares.  The number of shares of Common Stock
                      ---------------                                       
     outstanding at any given time shall not include shares owned or held by or
     for the account of the Corporation, and the disposition of any such shares
     shall be considered an issue or sale of Common Stock for the purpose of
     this subparagraph 6D.

          6D(a)     Special Adjustment to Series B Convertible Preferred Stock.
                    ----------------------------------------------------------  
In addition to the adjustments to the Conversion Price pursuant to subparagraph
6D, the Conversion Price of the Series B convertible Preferred Stock will be
adjusted to an amount equal to: (a) two times the Corporation's consolidated
gross revenues from operations for its fiscal year ending September 30, 1992,
(b) divided by 4,143,892; provided, however, that in no event shall the
foregoing adjustment result in a Conversion Price of less than $.965 per share
or more than $1.93 per share.  The foregoing notwithstanding no adjustment
pursuant to this subparagraph 6D(a) will be made if the then Conversion Price
of the Series B Convertible Preferred Stock shall be less than $.965 per share.
The numbers and prices set forth in this subparagraph 6D(a) shall be
appropriately adjusted to reflect the occurrence of any event described in
subparagraph 6F.

          6E.  Certain Issues of Common Stock and Other Events Excepted.
               --------------------------------------------------------  
Anything herein to the contrary notwithstanding, the Corporation shall not be
required to make any adjustment of the Conversion Price in the case of the
issuance of (i) up to an aggregate of 800,000 shares (appropriately adjusted to
reflect the occurrence of any event described in subparagraph 6F) of Common
Stock to directors, officers, employees or consultants of the Corporation in
connection with their service to the Corporation or their employment by the
Corporation and (ii) shares of Common Stock issued upon conversion of the
Preferred Stock. Any shares of Common Stock issued pursuant to clause (i) of
this subparagraph 6E which are hereinafter repurchased by the Company at a
purchase price per share no greater than the price per share paid to the Company
upon the issuance of such shares shall again be available for issuance pursuant
to clause (i) of this subparagraph 6E. Further, no adjustment to
<PAGE>
 
the Conversion Price of the Series A Convertible Preferred Stock shall be made
as a result of any adjustment to the Conversion Price of the Series B
Convertible Preferred Stock pursuant to subparagraph 6D(a).

          6F.  Subdivision or Combination of Common Stock.  In case the
               ------------------------------------------              
Corporation shall at any time subdivide (by any stock split, stock dividend or
otherwise) its outstanding shares of Common Stock into a greater number of
shares, the Conversion Price in effect immediately prior to such subdivision
shall be proportionately reduced, and, conversely, in case the outstanding
shares of Common Stock shall be combined into a smaller number of shares, the
Conversion Price in effect immediately prior to such combination shall be
proportionately increased.

          6G.  Reorganization or Reclassification.  If any capital
               ----------------------------------                 
reorganization or reclassification of the capital stock of the Corporation shall
be effected in such a way that holders of Common Stock shall be entitled to
receive stock, securities or assets with respect to or in exchange for Common
Stock, then, as a condition of such reorganization or reclassification, lawful
and adequate provisions shall be made whereby each holder of a share or shares
of Preferred Stock shall thereupon have the right to receive, upon the basis and
upon the terms and conditions specified herein and in lieu of the shares of
Common Stock immediately theretofore receivable upon the conversion of such
share or shares of Preferred Stock, such shares of stock, securities or assets
as may be issued or payable with respect to or in exchange for a number of
outstanding shares of such Common Stock equal to the number of shares of such
Common Stock immediately theretofore receivable upon such conversion had such
reorganization or reclassification not taken place, and in any such case
appropriate provisions shall be made with respect to the rights and interests of
such holder to the end that the provisions hereof (including without limitation
provisions for adjustments of the Conversion Price) shall thereafter be
applicable, as nearly as may be, in relation to any shares of stack, securities
or assets thereafter deliverable upon the exercise of such conversion rights.

          6H.  Notice of Adjustment.  Upon any adjustment of the Conversion
               --------------------                                        
Price, then and in each such case the Corporation shall give written notice
thereof, by first class mail, postage prepaid, or by telex or telecopier to non-
U.S. residents, addressed to each holder of shares of Preferred Stock at the
address of such holder as shown an the books of the Corporation, which notice
shall state the Conversion Price resulting from such adjustment, setting forth
in reasonable detail the method upon which such calculation is based.

          6I.  Other Notices.  In case at any time:
               -------------                       
<PAGE>
 
               (1) the Corporation shall declare any dividend upon its Common
     Stock payable in cash or stock or make any other distribution to the
     holders of its Common Stock;

               (2) the Corporation shall offer for subscription pro rata to the
                                                                --- ----
     holders of its Common Stock any additional shares of stock of any class or
     other rights;

               (3) there shall be any capital reorganization or reclassification
     of the capital stock of the Corporation, or a consolidation or merger of
     the Corporation with or into, or a sale of all or substantially all its
     assets to, another entity or entities; or

               (4) there shall be a voluntary or involuntary dissolution,
     liquidation or winding up of the Corporation;

then, in any one or more of said cases, the Corporation shall give, by first
class mail, postage prepaid, or by telex or telecopier to non-U.S. residents,
addressed to each holder of any shares of Preferred Stock at the address of such
holder as shown on the books of the Corporation, (a) at least 20 days' prior
written notice of the date on which the books of the Corporation shall close or
a record shall be taken for such dividend, distribution or subscription rights
or for determining rights to vote in respect of any such reorganization,
reclassification, consolidation, merger, sale, dissolution, liquidation or
winding up and (b) in the case of any such reorganization, reclassification,
consolidation, merger, sale, dissolution, liquidation or winding up, at least 20
days, prior written notice of the date when the same shall take place.  Such
notice in accordance with the foregoing clause (a) shall also specify, in the
case of any such dividend, distribution or subscription rights, the date on
which the holders of Common Stock shall be entitled thereto and such notice in
accordance with the foregoing clause (b) shall also specify the date on which
the holders of Common Stock shall be entitled to exchange their Common Stock for
securities or other property deliverable upon such reorganization,
reclassification, consolidation, merger, sale, dissolution, liquidation or
winding up, as the case may be.

          6J.  Stock to be Reserved.  The Corporation will at all times reserve
               --------------------                                            
and keep available out of its authorized Common Stock, solely for the purpose of
issuance upon the conversion of Preferred Stock as herein provided, such number
of shares of Common Stock as shall then be issuable upon the conversion of all
outstanding shares of Preferred Stock.  The Corporation covenants that all
shares of Common Stock which shall be so issued shall be duly and validly issued
and fully paid and nonassessable and free from all taxes, liens and charges with
respect to the issue thereof, and, without limiting the generality of the
foregoing, the Corporation covenants that it will from time to time take all
such action as may be requisite to assure that the par value per share of the
Common Stock is at all times equal to or less than the Conversion
<PAGE>
 
Price in effect at the time.  The Corporation will take all such action as may
be necessary to assure that all such shares of Common Stock may be so issued
without violation of any applicable law or regulation, or of any requirement of
any national securities exchange upon which the Common Stock may be listed.  The
Corporation will not take any action which results in any adjustment of the
Conversion Price if the total number of shares of Common Stock issued and
issuable after such action upon conversion of the Preferred Stock would exceed
the total number of shares of Common Stock then authorized by its Certificate of
Incorporation.

          6K.  No Reissuance of Preferred Stock.  Shares of Preferred Stock
               --------------------------------                            
which are converted into shares of Common Stock as provided herein shall not be
reissued.

          6L.  Issue Tax.  The issuance of certificates for shares of Common
               ---------                                                    
stock upon conversion of Preferred Stock shall be made without charge to the
holders thereof for any issuance tax in respect thereof, provided that the
Corporation shall not be required to pay any tax which may be payable in respect
of any transfer involved in the issuance and delivery of any certificate in a
name other than that of the holder of the Preferred Stock which is being
converted.

          6M.  Closing of Books.  The Corporation will at no time close its
               ----------------                                            
transfer books against the transfer of any Preferred Stock or of any shares of
Common Stock issued or issuable upon the conversion of any shares of Preferred
Stock in any manner which interferes with the timely conversion of such
Preferred Stock, except as may otherwise be required to comply with applicable
securities laws.

          6N.  Definition of Common Stock.  As used in this paragraph 6, the 
               --------------------------                                   
term "Common Stock" shall mean and include the Corporation's authorized
Common Stock, par value $.01 per share, as constituted on the date of filing of
these terms of the Preferred Stock, and shall also include any capital stock of
any class of the Corporation thereafter authorized which shall neither be
limited to a fixed sum or percentage of par value in respect of the rights of
the holders thereof to participate in dividends nor entitled to a preference in
the distribution of assets upon the voluntary or involuntary liquidation,
dissolution or winding up of the Corporation; provided that the shares of Common
Stock receivable upon conversion of shares of Preferred Stock shall include only
shares designated as Common Stock of the Corporation on the date of filing of
this instrument, or in case of any reorganization' or reclassification of the
outstanding shares thereof, the stock, securities or assets provided for in
subparagraph 6G.

          6O.  Mandatory Conversion.  If at any time (A) the Corporation shall
               --------------------                                           
effect a firm commitment underwritten public offering of shares of Common Stock
in which (i) the aggregate price paid for such shares by the public shall be at
least
<PAGE>
 
$7,500,000 and (ii) the price paid by the public for such shares shall be at
least $5.25 per share (appropriately adjusted to reflect the occurrence of any
event described in subparagraph 6F) or (B) there shall be less than twenty
percent (20%) of the originally issued shares of Preferred Stock outstanding,
then effective upon the closing of the sale of such shares by the Corporation
pursuant to such public offering or such reduction in the number of outstanding
shares of Preferred Stock, as the case may be, all outstanding shares of
Preferred Stock shall automatically and without any further action on the part
of the Corporation convert to shares of Common Stock.

     7.   Redemption.  The shares of Preferred Stock shall be redeemed as
          ----------                                                     
follows:

          7A.  Mandatory Redemption.  On December 31, 1997 (the "Redemption
               ---------------------                                        
Date"), the Corporation shall redeem from each holder of shares of Preferred
Stock, out of funds legally available therefor, all of the shares of Preferred
Stock held by such holder on the Redemption Date.

          7B.  Redemption Price and Payment.  The Preferred Stock to be redeemed
               ----------------------------                                     
on the Redemption Date shall be redeemed by paying for each share in cash an
amount equal to the greater of (i) the Liquidation Preference Payment for such
Preferred Stock and (ii) the Fair Market Value as of September 30, 1997, such
amount being referred to as the "Redemption Price".  Such payment shall be made
in full on the Redemption Date to the holders entitled thereto.

          7C.  Redemption Mechanics.  At least ten (10) but not more than ninety
               --------------------                                             
(90) days prior to the Redemption Date, written notice (the "Redemption Notice")
shall be given by the Corporation by mail, postage prepaid, or by telex or
telecopier to non-U.S. residents, to each holder of record (at the close of
business on the business day next preceding the day on which the Redemption
Notice is given) of shares of Preferred Stock notifying such holder of the
redemption and specifying the Redemption Price, the Redemption Date and the
place where said Redemption Price shall be payable.  The Redemption Notice shall
be addressed to each holder at his address as shown by the records of the
Corporation.  From and after the close of business on the Redemption Date,
unless there shall have been a default in the payment of the Redemption Price,
all rights of holders of shares of Preferred Stock (except the right to receive
the Redemption Price) shall cease with respect to such shares, and such shares
shall not thereafter be transferred on the books of the Corporation or be deemed
to be outstanding for any purpose whatsoever.  If the funds of the Corporation
legally available for redemption of shares of Preferred Stock on the Redemption
Date are insufficient to redeem the total number of outstanding shares of
Preferred Stock, the holders of shares of Preferred Stock shall share ratably,
based upon Liquidation Payments, in any funds legally available for redemption
of such shares according to the respective amounts which would be payable with
<PAGE>
 
respect to the full number of shares owned by them if all such outstanding
shares were redeemed in full.  The shares of Preferred Stock not redeemed shall
remain outstanding and entitled to all rights and preferences provided herein.
At any time thereafter when additional funds of the Corporation are legally
available for the redemption of such shares of Preferred Stock, such funds will
be used, at the end of the next succeeding fiscal quarter, to redeem the balance
of such shares, or such portion thereof for which funds are then legally
available, on the basis set forth above.

          7D.  Fair Market Value.  For the purposes of this paragraph 7, "Fair
               -----------------                                              
Market Value" per share of Preferred Stock shall mean:

               7D(1)  if the Company's Common Stock is publicly traded, an
     amount (A) equal to (x) the average on September 30, 1997 of the high and
     low prices of the Common Stock on the principal national securities
     exchange on which the Common Stock is traded, if such stock is then traded
     on a national securities exchange; or (y) the last reported sale price on
     September 30, 1997 of the Common Stock on the NASDAQ National Market List,
     if the Common Stock is not then traded on a national securities exchange;
     or (z) the closing bid price (or average of bid prices) last quoted on
     September 30, 1997 by an established quotation service for over-the-counter
     securities, if the Common Stock is not reported on the NASDAQ National
     Market List, (B) multiplied by the number of shares of Common Stock
     (including fractions of a share) into which each share of Preferred Stock
     may be converted as of September 30, 1997; or

               7D(2)  if the Company's Common Stock is not publicly traded as
     provided in subparagraph 7(D)(1) above, an amount (A) determined by
     dividing the Company's Fair Market Value, determined as of September 30,
     1997, by the number of actual outstanding shares of Common Stock, on a
     fully-diluted basis, as of September 30, 1997, (B) multiplied by the number
     of shares of Common Stock (including fractions of a share) into which each
     share of Preferred Stock may be converted as of September 30, 1997.  The
     Company's Fair Market Value shall be the price which could be obtained for
     one hundred percent (100%) of the equity interest in the Company on a
     consolidated basis if the Company were sold to a willing buyer by a willing
     seller in a single arm's-length transaction, determined by considering the
     Company's profits after tax, book value, revenues and cash flow as of
     September 30, 1997.

               In the event that the Fair Market Value per share of Common Stock
     is to be determined pursuant to subparagraph 7D(2) above then, in such
     event, on or before October 31, 1997, a representative of the Company and a
     representative of the holder or holders of a majority of the then
<PAGE>
 
     outstanding shares of Preferred Stock will use their best efforts to reach
     agreement on the Company's Fair Market Value.  If they are unable to reach
     such agreement within ten (10) days after the end of such period, the
     Company and such holder or holders will agree on the selection of an
     independent appraiser.  Such appraiser will have fifteen (15) days in which
     to determine the Company's Fair Market Value, and its determination thereof
     will be final and binding on all parties concerned.  If the Company and
     such holder or holders are unable to reach an agreement as to an
     independent appraiser within five (5) days after the aforesaid ten (10) day
     period, then two appraisers will be appointed within five (5) days
     thereafter to determine the Company's Fair Market Value, one by the Company
     and one by the holder or holders of a majority of the then outstanding
     shares of Preferred Stock.  Each of the Company and such holder or holders
     will cause their appraiser to determine independently the Company's Fair
     Market Value within fifteen (15) days after the time of their appointment.
     If the lesser of the two appraised values so determined (the "Low Value")
     exceeds or is equal to ninety percent (90%) of the value of the greater of
     the two appraised values (the "High Value"), the Company's Fair Market
     Value will be deemed to be equal to the average of the two appraisals.  If
     the Low Value is less than ninety percent (90%) of the High Value, the two
     appraisers will themselves appoint a third appraiser within five (5) days
     after the two appraisals have been rendered.  Such third appraiser will
     have fifteen (15) days in which to determine independently the Company's
     Fair Market Value.  The median of the three (3) appraised values shall be
     binding on all parties concerned as the Company's Fair Market Value.  The
     expenses of the appraisal will be borne solely by the Company.

          7E.  Additional Payments Upon Merger, Etc.  If at any time within one
               ------------------------------------                            
year after the date of redemption provided for in paragraph 7A, the Company
shall become party to one or more mergers, consolidations, sales of all or
substantially all of its assets or other similar corporate actions pursuant to
which the holders of the Company's Common Stock receive cash, securities or
other property, or the Company is acquired by the purchase of a majority of
its shares of Common Stock, or the Company or its stockholders enter into any
agreement or letter of intent contemplating any of the foregoing transactions,
the Company shall, simultaneously with the consummation of any such transaction
or at such later time as any payment described below is received by the Company
or its stockholders, make an additional payment to the holder or holders whose
shares of Preferred Stock were so redeemed by the Company in an amount equal to
the excess, if any, of the value per share of the cash, securities and other
property that such holder or holders would have received (or that the Company
received in which such holder or holders would have had a beneficial interest)
had the shares of Preferred Stock not been redeemed pursuant to paragraph 7A,
<PAGE>
 
over the payment received by such holder or holders with respect to such shares
of Preferred Stock.  Each payment made to such holder or holders pursuant to
this subparagraph 7E shall be made either in cash or in the form of the
securities and other property received by the holders of shares of Common Stock
of the Company.

          7F.  Redeemed or Otherwise Acquired Shares to be Retired.  Any shares
               ---------------------------------------------------             
of Preferred Stock redeemed pursuant to this paragraph 7 or otherwise acquired
by the Corporation in any manner whatsoever shall be cancelled and shall not
under any circumstances be reissued; and the Corporation may from time to time
take such appropriate corporate action as may be necessary to reduce accordingly
the number of authorized shares of Preferred Stock.

     8.   Amendments.  No provision of these terms of the Preferred Stock may be
          ----------                                                            
amended, modified or waived without the written consent or affirmative vote of
the holders of at least two-thirds of the then outstanding shares of Preferred
Stock, voting together as a single series.

     IN WITNESS WHEREOF, Credit Technologies, Inc. has caused this certificate
to be signed by its President and attested by its Secretary this 
   11   day of December, 1991.
- --------       --------

                                    CREDIT TECHNOLOGIES, INC.                 



ATTEST                              By: /s/ Pamela D.A. Reeve
                                       -----------------------
                                         Its President

By: /s/ John D. Patterson, Jr.
   ---------------------------
   Its Secretary
<PAGE>
 
                            CERTIFICATE OF AMENDMENT

                                       OF

                          CERTIFICATE OF INCORPORATION

                                       OF

                           CREDIT TECHNOLOGIES, INC.

     Credit Technologies, Inc., a corporation organized and existing under and
by virtue of the General Corporation Law of the State of Delaware (the
"Corporation"), DOES HEREBY CERTIFY:

     That the following amendment to the Certificate of Incorporation of the
Corporation dated June 16, 1989, as amended on November 13, 1990, December 20,
1990, February 11, 1991 and December 19, 1991, has been duly adopted in
accordance with the provisions of Section 242 of the Delaware General
Corporation Law:

     That the Certificate of Incorporation of the Corporation be amended by
deleting the old Article Fourth and insert in a new Article Fourth in its stead
which shall be and read as follows in its entirety:

     FOURTH:  The total number of shares of capital stock which the Corporation
shall have the authority to issue shall be 8,475,516 shares, of which 7,000,000
shall be shares of common stock, each of which shall have a par value of $.01
(the "Common Stock"), and 1,475,516 shall be shares of preferred stock, each of
which shall have a par value of $.01 (the "Preferred Stock"), amounting to an
aggregate par value of $84,755.16.

     The following is a statement of the designations, powers, preferences and
rights, and the qualifications, limitations and restrictions, granted to or
imposed upon the respective classes of shares of capital stock of the
Corporation or the holders thereof:
<PAGE>
 
     IN WITNESS WHEREOF, Credit Technologies, Inc. has caused this certificate
to be signed by its President and attested by its Secretary this 7th day of
                                                                 ---
June, 1993.

                                    CREDIT TECHNOLOGIES, INC.                   


                                    By: /s/ Pamela D.A. Reeve
                                       -----------------------
                                       Its President

ATTEST


By: /s/ John D. Patterson, Jr.
   ---------------------------
   Its Secretary
<PAGE>
 
          SERIES A, SERIES B AND SERIES C CONVERTIBLE PREFERRED STOCK


     1.  Number of Shares.  The series of Preferred Stock designated and known
         ----------------                                                     
as "Series A Convertible Preferred Stock" shall consist of 630,516 shares.  The
series of Preferred stock designated and known as the "Series B Convertible
Preferred Stock" shall consist of 620,000 shares.  The series of Preferred Stock
designated and known as "Series C Convertible Preferred Stock" shall consist of
225,000 shares.  The term "Preferred Stock" used without reference to the Series
A Convertible Preferred Stock, the Series B Convertible Preferred Stock or the
Series C Convertible Preferred Stock means the Series A Convertible Preferred
Stock, the Series B Convertible Preferred Stock and the Series C Convertible
Preferred Stock share for share alike and without distinction as to series
except as otherwise expressly provided or as the context otherwise requires.

     2.  Voting.
         ------ 

          2A.  General.  Except as may be otherwise provided in these terms of
               -------                                                        
the Preferred Stock or by law, the Preferred Stock shall vote together with all
other classes and series of stock of the Corporation as a single class on all
actions to be taken by the stockholders of the Corporation, including, without
limitation, the election of directors of the Corporation.  Notwithstanding the
foregoing or anything else to the contrary provided in the Certificate of
Incorporation, if the Corporation fails or refuses, for any reason or for no
reason, to redeem on the Redemption Date (as defined in paragraph 7) all of the
then outstanding shares of Preferred Stock in accordance with the terms and
provisions of paragraph 7, the holders of the Preferred Stock, voting together
as a single series, shall be entitled to elect a majority of the directors of
the Corporation.  Each share of Preferred Stock shall entitle the holder thereof
to such number of votes per share on each such action as shall equal the number
of shares of Common Stock (including fractions of a share) into which each such
share of Preferred Stock is then convertible.

          2B.  Board Size.  The Corporation shall not, without the written
               ----------                                                 
consent or affirmative vote of the holders of at least two-thirds of the then
outstanding shares of Preferred Stock, given in writing or by vote at a meeting,
consenting or voting (as the case may be) together as a single series, increase
the maximum number of directors constituting the Board of Directors to a number
in excess of seven.

     3.  Dividends.  Commencing on and from October 1, 1992, the holders of the
         ---------                                                             
Series A Convertible Preferred Stock shall be entitled to receive, out of funds
legally available therefor, annual dividends at the rate per annum of $.127 per
share; commencing on and from October 1, 1992, the holders of the Series
<PAGE>
 
B Convertible Preferred Stock shall be entitled to receive, out of funds legally
available therefor, annual dividends at the rate per annum of $.14 per share;
and, commencing on and from October 1, 1993, the holders of the Series C
Convertible Preferred Stock shall be entitled to receive, out of funds legally
available therefor, annual dividends at the rate per annum of $.24 per share
(annually an "Accrued Dividend" and collectively the "Accruing Dividends"),
subject to the terms of this paragraph 3.  Accruing Dividends shall be paid
(except as hereinafter provided) on the last day of December in each year for
the period ended on the immediately prior September 30, with the first such
dividend with respect to the Series A Convertible Preferred Stock and the Series
B Convertible Preferred Stock being paid on December 31, 1993 for the period
ended September 30, 1993 and the first such dividend with respect to the Series
C Convertible Preferred Stock being paid on December 31, 1994 for the period
ended September 30, 1994.  Accruing Dividends shall accrue from day to day,
whether or not earned or declared, and shall be cumulative.  If the Corporation
has consolidated net after-tax income of less than $500,000 in a fiscal year
ended September 30, the Board of Directors may defer paying an Accrued Dividend
on the Preferred Stock for such period.  If the Corporation has consolidated net
after-tax income of $500,000 or more in any fiscal year in which Accrued
Dividends are payable, then, on the December 31 immediately following the end of
such fiscal year, the Corporation shall pay Accruing Dividends on all Preferred
Stock with respect to which Accruing Dividends are then payable on a pro-rata
basis to the extent of the lesser of 20% of consolidated net after-tax income or
all Accruing Dividends then payable, subject to the following.  Accrued
Dividends with respect to each fiscal year will not be payable until all Accrued
Dividends with respect to prior years have been paid.  For each $500,000 in
consolidated net after-tax income of the Corporation in a fiscal year, if the
Corporation shall not pay the entire unpaid portion of one year's Accrued
Dividend (to the extent that such Accrued Dividend is then payable), it shall,
after payment of dividends, increase the unpaid amount of such Accrued Dividend
by 8% of such unpaid amount.  For the purposes of this paragraph 3, consolidated
net after-tax income shall be determined in accordance with generally accepted
accounting principles, consistently applied.

     4.  Liquidation.  Upon any liquidation, dissolution or winding up of the
         -----------                                                         
Corporation, whether voluntary or involuntary, the holders of the shares of
Preferred Stock shall first be entitled, before any distribution or payment is
made upon any stock ranking on liquidation junior to the Preferred Stock, to be
paid an amount equal to the greater of (i) $1.586 per share in the case of each
share of Series A Convertible Preferred Stock, $1.75 per share in the case of
each such share of Series B Convertible Preferred Stock and $3.00 per share in
the case of each share of Series C Convertible Preferred Stock, plus, in the
case of each share, an amount equal to all Accruing Dividends unpaid thereon
(whether or not declared) and any other dividends declared but unpaid thereon,
computed to the date payment thereof is made available, or (ii) such amount per
share as would have been payable had each such share of Preferred Stock been
<PAGE>
 
converted to Common Stock pursuant to paragraph 6 immediately prior to such
liquidation, dissolution or winding up, and the holders of Preferred Stock shall
not be entitled to any further payment, such amount payable with respect to one
share of Preferred Stock being sometimes referred to as the "Liquidation
Preference Payment" and with respect to all shares of Preferred Stock being
sometimes referred to as the "Liquidation Preference Payments".  If upon such
liquidation, dissolution or winding up of the Corporation, whether voluntary or
involuntary, the assets to be distributed among the holders of Preferred Stock
shall be insufficient to permit payment in full to the holders of Preferred
Stock of the Liquidation Preference Payments, then the entire assets of the
Corporation to be so distributed shall be distributed ratably, based upon
Liquidation Payments, among the holders of Preferred Stock.  Upon any such
liquidation, dissolution or winding up of the Corporation, immediately after the
holders of Preferred Stock shall have been paid in full the Liquidation
Preference Payments, the remaining net assets of the Corporation available for
distribution may be distributed ratably among the holders of Common Stock.
Written notice of such liquidation, dissolution or winding up, stating a payment
date and the place where said payments shall be made, shall be given by mail,
postage prepaid, or by telex to non-U.S. residents, not less than 20 days prior
to the payment date stated therein, to the holders of record of Preferred Stock,
such notice to be addressed to each such holder at its address as shown by the
records of the Corporation.  The consolidation or merger of the Corporation into
or with any other entity or entities which results in the exchange of
outstanding shares of the Corporation for securities or other consideration
issued or paid or caused to be issued or paid by any such entity or affiliate
thereof (excluding any consolidation or merger in which the shareholders of the
Corporation hold more than fifty percent (50%) of the voting securities of the
surviving corporation), and the sale or transfer by the Corporation of all or
substantially all its assets, shall be deemed to be a liquidation, dissolution
or winding up of the Corporation within the meaning of the provisions of this
paragraph 4.  For purposes hereof, the Common Stock shall rank in liquidation
junior to the Preferred Stock.

     5.  Restrictions.  At any time when shares of Preferred Stock are
         ------------                                                 
outstanding, except where the vote or written consent of the holders of a
greater number of shares of the Corporation is required by law or by the
Certificate of Incorporation, and in addition to any other vote required by law
or the Certificate of Incorporation, without the approval of the holders of at
least seventy-five percent (75%) of the then outstanding shares of Preferred
Stock, given in writing or by vote at a meeting, consenting or voting (as the
case may be) together as a single series, the Corporation will not:

          5A.  Create or authorize the creation of any additional class or
series of shares of stock unless the same ranks junior to the Preferred Stock as
to the distribution of assets on the liquidation, dissolution or winding up of
the Corporation, or increase the authorized amount of the Series A Convertible
Preferred Stock, Series B Convertible Preferred Stock or Series C
<PAGE>
 
Convertible Preferred Stock or increase the authorized amount of any additional
class or series of shares of stock unless the same ranks junior to the Preferred
Stock as to the distribution of assets on the liquidation, dissolution or
winding up of the Corporation, or create or authorize any obligation or security
convertible into shares of Series A Convertible Preferred Stock, Series B
Convertible Preferred Stock or Series C Convertible Preferred Stock or into
shares of any other class or series of stock unless the same ranks junior to the
Preferred Stock as to the distribution of assets on the liquidation, dissolution
or winding up of the Corporation, whether any such creation, authorization or
increase shall be by means of amendment to the Certificate of Incorporation or
by merger, consolidation or otherwise;

          5B.  Consent to any liquidation, dissolution or winding up of the
Corporation or consolidate or merge into or with any other entity or entities or
sell or transfer all or substantially all its assets;

          5C.  Amend, alter or repeal its Certificate of Incorporation or By-
laws so as to adversely affect the rights of the holders of the Series A
Convertible Preferred Stock, the Series B Convertible Preferred Stock or the
Series C Convertible Preferred Stock;

          5D.  Purchase or set aside any sums for the purchase of, or pay any
dividend or make any distribution on, any shares of stock other than the
Preferred Stock, except for dividends or other distributions payable on the
Common Stock solely in the form of additional shares of Common Stock and except
for the purchase of shares of Common Stock from former employees of the
Corporation who acquired such shares directly from the Corporation, if each such
purchase is made pursuant to contractual rights held by the Corporation relating
to the termination of employment of such former employee and the purchase price
does not exceed the original issue price paid by such former employee to the
Corporation for such shares; or

          5E.  Redeem or otherwise acquire any shares of Preferred Stock except
as expressly authorized in paragraph 7 hereof or pursuant to a purchase offer
made pro rata to all holders of shares of Preferred Stock on the basis of the
aggregate number of outstanding shares of Preferred Stock then held by each such
holder.

     6.  Conversions.  The holders of shares of Preferred Stock shall have the
         -----------                                                          
following conversion rights:

          6A.  Right to Convert.  Subject to the terms and conditions of this
               ----------------                                              
paragraph 6, the holder of any share or shares of Preferred Stock shall have the
right, at its option at any time, to convert any such shares of Preferred Stock
(except that upon any liquidation of the Corporation the right of conversion
shall terminate at the close of business on the business day fixed for payment
of the amount distributable on the Preferred Stock) into such number of fully
paid and nonassessable shares of
<PAGE>
 
Common Stock as is obtained by (A) in the case of the Series A Convertible
Preferred Stock, (i) multiplying the number of shares of Series A Convertible
Preferred Stock so to be converted by $1.586 and (ii) dividing the result by the
conversion price of $1.586 per share or, in case an adjustment of such price has
taken place pursuant to the further provisions of this paragraph 6, then by the
conversion price as last adjusted and in effect at the date any share or shares
of Series A Convertible Preferred Stock are surrendered for conversion; (B) in
the case of the Series B Convertible Preferred Stock, (i) multiplying the number
of shares of Series B Convertible Preferred Stock so to be converted by $1.75
and (ii) dividing the result by the conversion price of $1.44241251 per share
or, in case an adjustment of such price has taken place pursuant to the further
provisions of this paragraph 6, then by the conversion price as last adjusted
and in effect at the date any share or shares of Series B Convertible Preferred
Stock are surrendered for conversion; and (C) in the case of the Series C
Convertible Preferred Stock, (i) multiplying the number of shares of Series C
Convertible Preferred Stock so to be converted by $3.00 and (ii) dividing the
result by the conversion price of $3.00 per share or, in the case an adjustment
of such price has taken place pursuant to the further provisions of this
paragraph 6, then by the conversion price as last adjusted and in effect at the
date any share or shares of Series C Convertible Preferred Stock are surrendered
for conversion.  The conversion price set forth in each of clause A(ii), clause
B(ii) and clause C(ii) hereof or such price as last adjusted, being referred to
as the "Conversion Price".  Such rights of conversion shall be exercised by the
holder thereof by giving written notice that the holder elects to convert a
stated number of shares of Preferred Stock into Common Stock and by surrender of
a certificate or certificates for the shares so to be converted to the
Corporation at its principal office (or such other office or agency of the
Corporation as the Corporation may designate by notice in writing to the holders
of the Preferred Stock) at any time during its usual business hours on the date
set forth in such notice, together with a statement of the name or names (with
address) in which the certificate or certificates for shares of Common Stock
shall be issued.

          6B.  Issuance of Certificates; Time Conversion Effected.  Promptly
               --------------------------------------------------           
after the receipt of the written notice referred to in subparagraph 6A and
surrender of the certificate or certificates for the share or shares of
Preferred Stock to be converted, the Corporation shall issue and deliver, or
cause to be issued and delivered, to the holder, registered in such name or
names as such holder may direct, a certificate or certificates for the number of
whole shares of Common Stock issuable upon the conversion of such share or
shares of Preferred Stock.  To the extent permitted by law, such conversion
shall be deemed to have been effected and the applicable Conversion Price shall
be determined as of the close of business on the date on which such written
notice shall have been received by the Corporation and the certificate or
certificates for such share or shares shall have been surrendered as aforesaid,
and at such time the rights of the holder of such share or shares of Preferred
Stock shall cease, and the person or persons in whose name or names any
<PAGE>
 
certificate or certificates for shares of Common Stock shall be issuable upon
such conversion shall be deemed to have become the holder or holders of record
of the shares represented thereby.

          6C.  Fractional Shares; Dividends; Partial Conversion.  No fractional
               ------------------------------------------------                
shares shall be issued upon conversion of Preferred Stock into Common Stock and
no payment or adjustment shall be made upon any conversion on account of any
cash dividends on the Common Stock issued upon such conversion.  At the time of
each conversion, the Corporation shall pay, out of assets legally available
therefor, in cash an amount equal to all dividends, excluding Accruing
Dividends, declared and unpaid on the shares of Preferred Stock surrendered for
conversion to the date upon which such conversion is deemed to take place as
provided in subparagraph 6B.  In case the number of shares of Preferred Stock
represented by the certificate or certificates surrendered pursuant to
subparagraph 6A exceeds the number of shares converted, the Corporation shall,
upon such conversion, execute and deliver to the holder, at the expense of the
Corporation, a new certificate or certificates for the number of shares of
Preferred Stock represented by the certificate or certificates surrendered which
are not to be converted.  If any fractional share of Common Stock would, except
for the provisions of the first sentence of this subparagraph 6C, be delivered
upon such conversion, the Corporation, in lieu of delivering such fractional
share, shall pay to the holder surrendering the Preferred Stock for conversion
an amount in cash equal to the current market price of such fractional share as
determined in good faith by the Board of Directors of the Corporation.

          6D.  Adjustment of Price Upon Issuance of Common Stock.  Except as
               -------------------------------------------------            
provided in subparagraph 6E, if and whenever the Corporation shall issue or
sell, or is, in accordance with subparagraphs 6D(1) through 6D(7), deemed to
have issued or sold, any shares of Common Stock for a consideration per share
less than any Conversion Price in effect immediately prior to the time of such
issue or sale, then, forthwith upon such issue or sale, such Conversion Price
shall be reduced to the price determined by dividing (i) an amount equal to the
sum of (a) the number of shares of Common Stock outstanding immediately prior to
such issue or sale (including the number of shares of Common Stock then issued
or issuable upon conversion of all issued and outstanding shares of Preferred
Stock) multiplied by the then existing Conversion Price and (b) the
consideration, if any, received by the Corporation upon such issue or sale, by
(ii) the total number of shares of Common Stock outstanding immediately after
such issue or sale (including the number of shares of Common Stock then issued
or issuable upon conversion of all issued and outstanding shares of Preferred
Stock).

     For purposes of this subparagraph 6D, the following subparagraphs 6D(1) to
6D(7) shall also be applicable:

               6D(1)  Issuance of Rights or Options.  In case at any time the
                      -----------------------------                          
     Corporation shall in any manner grant (whether directly or by assumption in
     a merger or otherwise) any warrants or other rights to subscribe for or to
     purchase, or
<PAGE>
 
     any options for the purchase of, Common Stock or any stock or security
     convertible into or exchangeable for Common Stock (such warrants, rights or
     options being called "Options" and such convertible or exchangeable stock
     or securities being called "Convertible Securities") whether or not such
     Options or the right to convert or exchange any such Convertible Securities
     are immediately exercisable, and the price per share for which Common Stock
     is issuable upon the exercise of such Options or upon the conversion or
     exchange of such Convertible Securities (determined by dividing (i) the
     total amount, if any, received or receivable by the Corporation as
     consideration for the granting of such Options, plus the minimum aggregate
     amount of additional consideration payable to the Corporation upon the
     exercise of all such Options, plus, in the case of such Options which
     relate to Convertible Securities, the minimum aggregate amount of
     additional consideration, if any, payable upon the issue or sale of such
     Convertible Securities and upon the conversion or exchange thereof, by (ii)
     the total maximum number of shares of Common Stock issuable upon the
     exercise of such Options or upon the conversion or exchange of all such
     Convertible Securities issuable upon the exercise of such Options) shall be
     less than any Conversion Price in effect immediately prior to the time of
     the granting of such Options, then the total maximum number of shares of
     Common Stock issuable upon the exercise of such Options or upon conversion
     or exchange of the total maximum amount of such Convertible Securities
     issuable upon the exercise of such Options shall be deemed to have been
     issued for such price per share as of the date of granting of such Options
     or the issuance of such Convertible Securities and thereafter shall be
     deemed to be outstanding.  Except as otherwise provided in subparagraph
     6D(3), no adjustment of any Conversion Price shall be made upon the actual
     issue of such Common Stock or of such Convertible Securities upon exercise
     of such Options or upon the actual issue of such Common Stock upon
     conversion or exchange of such Convertible Securities.

               6D(2)  Issuance of Convertible Securities.  In case the
                      ----------------------------------              
     Corporation shall in any manner issue (whether directly or by assumption in
     a merger or otherwise) or sell any Convertible Securities, whether or not
     the rights to exchange or convert any such Convertible Securities are
     immediately exercisable, and the price per share for which Common Stock is
     issuable upon such conversion or exchange (determined by dividing (i) the
     total amount received or receivable by the Corporation as consideration for
     the issue or sale of such Convertible Securities, plus the minimum
     aggregate amount of additional consideration, if any, payable to the
     Corporation upon the conversion or exchange thereof, by (ii) the total
     maximum number of shares of Common Stock issuable upon the conversion or
     exchange of all such Convertible Securities) shall be less than any
     Conversion Price in effect immediately prior to the time of such issue or
     sale, then the total maximum number of shares of Common Stock issuable upon
     conversion or exchange of all
<PAGE>
 
     such Convertible Securities shall be deemed to have been issued for such
     price per share as of the date of the issue or sale of such Convertible
     Securities and thereafter shall be deemed to be outstanding, provided that
     (a) except as otherwise provided in subparagraph 6D(3), no adjustment of
     any Conversion Price shall be made upon the actual issue of such Common
     Stock upon conversion or exchange of such Convertible Securities and (b) if
     any such issue or sale of such Convertible Securities is made upon exercise
     of any Options to purchase any such Convertible Securities for which
     adjustments of any Conversion Price have been or are to be made pursuant to
     other provisions of this subparagraph 6D, no further adjustment of such
     Conversion Price shall be made by reason of such issue or sale.

               6D(3)  Change in Option Price or Conversion Rate.  Upon the
                      -----------------------------------------           
     happening of any of the following events, namely, if the purchase price
     provided for in any Option referred to in subparagraph 6D(1), the
     additional consideration, if any, payable upon the conversion or exchange
     of any Convertible Securities referred to in subparagraph 6D(1) or 6D(2),
     or the rate at which Convertible Securities referred to in subparagraph
     6D(1) or 6D(2) are convertible into or exchangeable for Common Stock shall
     change at any time (including, but not limited to, changes under or by
     reason of provisions designed to protect against dilution), each
     Conversion Price in effect at the time of such event shall forthwith be
     readjusted to the Conversion Price which would have been in effect at such
     time had such Options or Convertible Securities still outstanding provided
     for such changed purchase price, additional consideration or conversion
     rate, as the case may be, at the time initially granted, issued or sold,
     but only if as a result of such adjustment the Conversion Price then in
     effect hereunder is thereby reduced; and on the expiration of any such
     Option or the termination of any such right to convert or exchange such
     Convertible Securities, each Conversion Price then in effect hereunder
     shall forthwith be increased to the Conversion Price which would have been
     in effect at the time of such expiration or termination had such Option or
     Convertible Securities, to the extent outstanding immediately prior to such
     expiration or termination, never been issued.

               6D(4)  Stock Dividends.  In case the Corporation shall declare a
                      ---------------                                          
     dividend or make any other distribution upon any stock of the Corporation
     payable in Common Stock (except for dividends or distributions upon the
     Common Stock), Options or Convertible Securities, any Common Stock, Options
     or Convertible Securities, as the case may be, issuable in payment of such
     dividend or distribution shall be deemed to have been issued or sold
     without consideration.

               6D(5)  Consideration for Stock.  In case any shares of Common
                      -----------------------                               
     Stock, Options or Convertible Securities shall be issued or sold for cash,
     the consideration received therefor shall be deemed to be the amount
     received by the
<PAGE>
 
     Corporation therefor, without deduction therefrom of any expenses incurred
     or any underwriting commissions or concessions paid or allowed by the
     Corporation in connection therewith.  In case any shares of Common Stock,
     Options or Convertible Securities shall be issued or sold for a
     consideration other than cash, the amount of the consideration other than
     cash received by the Corporation shall be deemed to be the fair value of
     such consideration as determined in good faith by the Board of Directors of
     the Corporation, without deduction of any expenses incurred or any
     underwriting commissions or concessions paid or allowed by the Corporation
     in connection therewith.  In case any Options shall be issued in connection
     with the issue and sale of other securities of the Corporation, together
     comprising one integral transaction in which no specific consideration is
     allocated to such Options by the parties thereto, such Options shall be
     deemed to have been issued for such consideration as determined in good
     faith by the Board of Directors of the Corporation.

               6D(6)  Record Date.  In case the Corporation shall take a record
                      -----------                                              
     of the holders of its Common Stock for the purpose of entitling them (i) to
     receive a dividend or other distribution payable in Common Stock, Options
     or Convertible Securities or (ii) to subscribe for or purchase Common
     Stock, Options or Convertible Securities, then such record date shall be
     deemed to be the date of the issue or sale of the shares of Common Stock
     deemed to have been issued or sold upon the declaration of such dividend or
     the making of such other distribution or the date of the granting of such
     right of subscription or purchase, as the case may be.

               6D(7)  Treasury Shares.  The number of shares of Common Stock
                      ---------------                                       
     outstanding at any given time shall not include shares owned or held by or
     for the account of the Corporation, and the disposition of any such shares
     shall be considered an issue or sale of Common Stock for the purpose of
     this subparagraph 6D.

          6D(a)  Special Adjustment to Series C Convertible Preferred Stock.  In
                 ----------------------------------------------------------     
addition to the adjustments to the Conversion Prices pursuant to subparagraph
6D, the Conversion Price of the Series C Convertible Preferred Stock and the
$3.00 per share liquidation payment with respect to the Series C Convertible
Preferred Stock described in paragraph 4 will be adjusted as described in this
subparagraph.  In the event that the Corporation's audited financial statements
for the year ended September 30, 1993 indicate that the Corporation has a net
profit for such period, then such Conversion Price and liquidation payment shall
be adjusted to an amount equal to:  (a) 2.22 times the Corporation's
consolidated gross revenues from operations for its fiscal year ending September
30, 1993, (b) divided by 5,169,230; provided, however, that in no event shall
the foregoing adjustment result in a Conversion Price of less than $2.50 per
share or more than $3.00 per share.  In the event that the Corporation's audited
financial statements for the year ended September 30, 1993 indicate that the
Corporation has a net loss
<PAGE>
 
for such period, then such Conversion Price and liquidation payment shall be
adjusted to an amount equal to $2.50.  The foregoing notwithstanding, no
adjustment pursuant to this subparagraph 6D(a) will be made if the then
Conversion Price of the Series C Convertible Preferred Stock shall be less than
$2.50 per share.  The numbers and prices set forth in this subparagraph 6D(a)
shall be appropriately adjusted to reflect the occurrence of any event described
in subparagraph 6F.

          6E.  Certain Issues of Common Stock and Other Events Excepted.
               --------------------------------------------------------  
Anything herein to the contrary notwithstanding, the Corporation shall not be
required to make any adjustment of any Conversion Price in the case of the
issuance of (i) up to an aggregate of 900,000 shares (appropriately adjusted to
reflect the occurrence of any event described in subparagraph 6F) of Common
Stock to directors, officers, employees or consultants of the Corporation in
connection with their service to the Corporation or their employment by the
Corporation and (ii) shares of Common Stock issued upon conversion of the
Preferred Stock.  Any shares of Common Stock issued pursuant to clause (i) of
this subparagraph 6E which are hereinafter repurchased by the Corporation at a
purchase price per share no greater than the price per share paid to the
Corporation upon the issuance of such shares shall again be available for
issuance pursuant to clause (i) of this subparagraph 6E.  Further, no adjustment
to the Conversion Prices of the Series A Convertible Preferred Stock or the
Series B Convertible Preferred Stock shall be made as a result of any adjustment
to the Conversion Price of the Series C Convertible Preferred Stock pursuant to
subparagraph 6D(a).

          6F.  Subdivision or Combination of Common Stock.  In case the
               ------------------------------------------              
Corporation shall at any time subdivide (by any stock split, stock dividend or
otherwise) its outstanding shares of Common Stock into a greater number of
shares, each Conversion Price in effect immediately prior to such subdivision
shall be proportionately reduced, and, conversely, in case the outstanding
shares of Common Stock shall be combined into a smaller number of shares, each
Conversion Price in effect immediately prior to such combination shall be
proportionately increased.

          6G.  Reorganization or Reclassification.  If any capital
               ----------------------------------                 
reorganization or reclassification of the capital stock of the Corporation shall
be effected in such a way that holders of Common Stock shall be entitled to
receive stock, securities or assets with respect to or in exchange for Common
Stock, then, as a condition of such reorganization or reclassification, lawful
and adequate provisions shall be made whereby each holder of a share or shares
of Preferred Stock shall thereupon have the right to receive, upon the basis and
upon the terms and conditions specified herein and in lieu of the shares of
Common Stock immediately theretofore receivable upon the conversion of such
share or shares of Preferred Stock, such shares of stock, securities or assets
as may be issued or payable with respect to or in exchange for a number of
outstanding shares of such Common Stock equal to the number of shares of such
Common Stock immediately theretofore receivable upon such conversion had such
reorganization or reclassification not taken place, and in any
<PAGE>
 
such case appropriate provisions shall be made with respect to the rights and
interests of such holder to the end that the provisions hereof (including
without limitation provisions for adjustments of the Conversion Prices) shall
thereafter be applicable, as nearly as may be, in relation to any shares of
stock, securities or assets thereafter deliverable upon the exercise of such
conversion rights.

          6H.  Notice of Adjustment.  Upon any adjustment of the Conversion
               --------------------                                        
Price of any series of Preferred Stock, then and in each such case the
Corporation shall give written notice thereof, by first class mail, postage
prepaid, or by telex or telecopier to non-U.S. residents, addressed to each
holder of shares of such series of Preferred Stock at the address of such holder
as shown on the books of the Corporation, which notice shall state the
Conversion Price resulting from such adjustment, setting forth in reasonable
detail the method upon which such calculation is based.

          6I.  Other Notices.  In case at any time:
               -------------                       

               (1)  the Corporation shall declare any dividend upon its Common
     Stock payable in cash or stock or make any other distribution to the
     holders of its Common Stock;

               (2)  the Corporation shall offer for subscription pro rata to the
                                                                 --- ----       
     holders of its Common Stock any additional shares of stock of any class or
     other rights;

               (3)  there shall be any capital reorganization or
     reclassification of the capital stock of the Corporation, or a
     consolidation or merger of the Corporation with or into, or a sale of all
     or substantially all its assets to, another entity or entities; or

               (4)  there shall be a voluntary or involuntary dissolution,
     liquidation or winding up of the Corporation;

then, in any one or more of said cases, the Corporation shall give, by first
class mail, postage prepaid, or by telex or telecopier to non-U.S. residents,
addressed to each holder of any shares of Preferred Stock at the address of such
holder as shown on the books of the Corporation, (a) at least 20 days' prior
written notice of the date on which the books of the Corporation shall close or
a record shall be taken for such dividend, distribution or subscription rights
or for determining rights to vote in respect of any such reorganization,
reclassification, consolidation, merger, sale, dissolution, liquidation or
winding up and (b) in the case of any such reorganization, reclassification,
consolidation, merger, sale, dissolution, liquidation or winding up, at least 20
days' prior written notice of the date when the same shall take place.  Such
notice in accordance with the foregoing clause (a) shall also specify, in the
case of any such dividend, distribution or subscription rights, the date on
which the holders of Common Stock shall be entitled thereto and such notice in
accordance with the foregoing clause (b) shall also specify the date on which
the holders of
<PAGE>
 
Common Stock shall be entitled to exchange their Common Stock for securities or
other property deliverable upon such reorganization, reclassification,
consolidation, merger, sale, dissolution, liquidation or winding up, as the case
may be.

          6J.  Stock to be Reserved.  The Corporation will at all times reserve
               --------------------                                            
and keep available out of its authorized Common Stock, solely for the purpose of
issuance upon the conversion of Preferred Stock as herein provided, such number
of shares of Common Stock as shall then be issuable upon the conversion of all
outstanding shares of Preferred Stock.  The Corporation covenants that all
shares of Common Stock which shall be so issued shall be duly and validly issued
and fully paid and nonassessable and free from all taxes, liens and charges with
respect to the issue thereof, and, without limiting the generality of the
foregoing, the Corporation covenants that it will from time to time take all
such action as may be requisite to assure that the par value per share of the
Common Stock is at all times equal to or less than the Conversion Prices in
effect at the time.  The Corporation will take all such action as may be
necessary to assure that all such shares of Common Stock may be so issued
without violation of any applicable law or regulation, or of any requirement of
any national securities exchange upon which the Common Stock may be listed.  The
Corporation will not take any action which results in any adjustment of any
Conversion Price if the total number of shares of Common Stock issued and
issuable after such action upon conversion of the Preferred Stock would exceed
the total number of shares of Common Stock then authorized by its Certificate of
Incorporation.

          6K.  No Reissuance of Preferred Stock.  Shares of Preferred Stock
               --------------------------------                            
which are converted into shares of Common Stock as provided herein shall not be
reissued.

          6L.  Issue Tax.  The issuance of certificates for shares of Common
               ---------                                                    
Stock upon conversion of Preferred Stock shall be made without charge to the
holders thereof for any issuance tax in respect thereof, provided that the
Corporation shall not be required to pay any tax which may be payable in respect
of any transfer involved in the issuance and delivery of any certificate in a
name other than that of the holder of the Preferred Stock which is being
converted.

          6M.  Closing of Books.  The Corporation will at no time close its
               ----------------                                            
transfer books against the transfer of any Preferred Stock or of any shares of
Common Stock issued or issuable upon the conversion of any shares of Preferred
Stock in any manner which interferes with the timely conversion of such
Preferred Stock, except as may otherwise be required to comply with applicable
securities laws.

          6N.  Definition of Common Stock.  As used in this paragraph 6, the
               --------------------------                                   
term "Common Stock" shall mean and include the Corporation's authorized Common
Stock, par value $.01 per share, as constituted on the date of filing of these
terms of the Preferred Stock, and shall also include any capital stock of any
class of the Corporation thereafter authorized which shall
<PAGE>
 
neither be limited to a fixed sum or percentage of par value in respect of the
rights of the holders thereof to participate in dividends nor entitled to a
preference in the distribution of assets upon the voluntary or involuntary
liquidation, dissolution or winding up of the Corporation; provided that the
shares of Common Stock receivable upon conversion of shares of Preferred Stock
shall include only shares designated as Common Stock of the Corporation on the
date of filing of this instrument, or in case of any reorganization or
reclassification of the outstanding shares thereof, the stock, securities or
assets provided for in subparagraph 6G.

          60.  Mandatory Conversion.  If at any time (A) the Corporation shall
               --------------------                                           
effect a firm commitment underwritten public offering of shares of Common Stock
in which (i) the aggregate price paid for such shares by the public shall be at
least $7,500,000 and (ii) the price paid by the public for such shares shall be
at least $5.25 per share (appropriately adjusted to reflect the occurrence of
any event described in subparagraph 6F) or (B) there shall be less than twenty
percent (20%) of the originally issued shares of Preferred Stock outstanding,
then effective upon the closing of the sale of such shares by the Corporation
pursuant to such public offering or such reduction in the number of outstanding
shares of Preferred Stock, as the case may be, all outstanding shares of
Preferred Stock shall automatically and without any further action on the part
of the Corporation convert to shares of Common Stock.

     7.  Redemption.  The shares of Preferred Stock shall be redeemed as
         ----------                                                     
follows:

          7A.  Mandatory Redemption.  On the Redemption Date (as hereinafter
               --------------------                                         
defined), the Corporation shall redeem from each holder of shares of Preferred
Stock, out of funds legally available therefor, all of the shares of Preferred
Stock held by such holder on the Redemption Date.  The Redemption Date with
respect to the Series A Convertible Preferred Stock and the Series B Convertible
Preferred Stock shall be December 31, 1997.  The Redemption Date with respect to
the Series C Convertible Preferred Stock shall be December 31, 1999.

          7B.  Redemption Price and Payment.  The Preferred Stock to be redeemed
               ----------------------------                                     
on the Redemption Date shall be redeemed by paying for each share in cash an
amount equal to the greater of (i) the Liquidation Preference Payment for such
Preferred Stock and (ii) the Fair Market Value as of the date ninety (90) days
prior to the applicable Redemption Date (the "Valuation Date"), such amount
being referred to as the "Redemption Price".  Such payment shall be made in full
on the Redemption Date to the holders entitled thereto.

          7C.  Redemption Mechanics.  At least ten (10) but not more than ninety
               --------------------                                             
(90) days prior to the Redemption Date, written notice (the "Redemption Notice")
shall be given by the Corporation by mail, postage prepaid, or by telex or
telecopier to non-U.S. residents, to each holder of record (at the close of
business on the business day next preceding the day on which the
<PAGE>
 
Redemption Notice is given) of shares of Preferred Stock whose shares are to be
redeemed on such Redemption Date notifying such holder of the redemption and
specifying the Redemption Price, the Redemption Date and the place where said
Redemption Price shall be payable.  The Redemption Notice shall be addressed to
each holder at his address as shown by the records of the Corporation.  From and
after the close of business on the Redemption Date, unless there shall have been
a default in the payment of the Redemption Price, all rights of holders of
shares of Preferred Stock whose shares are to be redeemed on such Redemption
Date (except the right to receive the Redemption Price) shall cease with respect
to such shares, and such shares shall not thereafter be transferred on the books
of the Corporation or be deemed to be outstanding for any purpose whatsoever.
If the funds of the Corporation legally available for redemption of shares of
Preferred Stock on the Redemption Date are insufficient to redeem the total
number of outstanding shares of Preferred Stock then to be redeemed, the holders
of such shares of Preferred Stock shall share ratably, based upon Liquidation
Payments, in any funds legally available for redemption of such shares according
to the respective amounts which would be payable with respect to the full number
of shares owned by them if all such outstanding shares were redeemed in full.
The shares of Preferred Stock due for redemption but not redeemed shall remain
outstanding and entitled to all rights and preferences provided herein.  At any
time thereafter when additional funds of the Corporation are legally available
for the redemption of such shares of Preferred Stock, such funds will be used,
at the end of the next succeeding fiscal quarter, to redeem the balance of such
shares, or such portion thereof for which funds are then legally available, on
the basis set forth above.

          7D.  Fair Market Value.  For the purposes of this paragraph 7, "Fair
               -----------------                                              
Market Value" per share of Preferred Stock shall mean:

               7D(1)  if the Corporation's Common Stock is publicly traded, an
     amount (A) equal to (x) the average on the Valuation Date of the high and
     low prices of the Common Stock on the principal national securities
     exchange on which the Common Stock is traded, if such stock is then traded
     on a national securities exchange; or (y) the last reported sale price on
     the Valuation Date of the Common Stock on the NASDAQ National Market List,
     if the Common Stock is not then traded on a national securities exchange;
     or (z) the closing bid price (or average of bid prices) last quoted on the
     Valuation Date by an established quotation service for over-the-counter
     securities, if the Common Stock is not reported on the NASDAQ National
     Market List, (B) multiplied by the number of shares of Common Stock
     (including fractions of a share) into which each share of Preferred Stock
     may be converted as of the Valuation Date; or

               7D(2)  if the Corporation's Common Stock is not publicly traded
     as provided in subparagraph 7(D)(1) above, an amount (A) determined by
     dividing the Corporation's Fair Market Value, determined as of the
     Valuation Date, by the
<PAGE>
 
     number of actual outstanding shares of Common Stock, on a fully-diluted
     basis, as of the Valuation Date, (B) multiplied by the number of shares of
     Common Stock (including fractions of a share) into which each share of
     Preferred Stock may be converted as of the Valuation Date.  The
     Corporation's Fair Market Value shall be the price which could be obtained
     for one hundred percent (100%) of the equity interest in the Corporation on
     a consolidated basis if the Corporation were sold to a willing buyer by a
     willing seller in a single arm's-length transaction, determined by
     considering the Corporation's profits after tax, book value, revenues and
     cash flow as of the Valuation Date.

               In the event that the Fair Market Value per share of Common Stock
     is to be determined pursuant to subparagraph 7D(2) above then, in such
     event, on or before thirty (30) days after the Valuation Date, a
     representative of the Corporation and a representative of the holder or
     holders of a majority of the then outstanding shares of Preferred Stock
     will use their best efforts to reach agreement on the Corporation's Fair
     Market Value.  If they are unable to reach such agreement within ten (10)
     days after the end of such period, the Corporation and such holder or
     holders will agree on the selection of an independent appraiser.  Such
     appraiser will have fifteen (15) days in which to determine the
     Corporation's Fair Market Value, and its determination thereof will be
     final and binding on all parties concerned.  If the Corporation and such
     holder or holders are unable to reach an agreement as to an independent
     appraiser within five (5) days after the aforesaid ten (10) day period,
     then two appraisers will be appointed within five (5) days thereafter to
     determine the Corporation's Fair Market Value, one by the Corporation and
     one by the holder or holders of a majority of the then outstanding shares
     of Preferred Stock.  Each of the Corporation and such holder or holders
     will cause their appraiser to determine independently the Corporation's
     Fair Market Value within fifteen (15) days after the time of their
     appointment.  If the lesser of the two appraised values so determined (the
     "Low Value") exceeds or is equal to ninety percent (90%) of the value of
     the greater of the two appraised values (the "High Value"), the
     Corporation's Fair Market Value will be deemed to be equal to the average
     of the two appraisals.  If the Low Value is less than ninety percent (90%)
     of the High Value, the two appraisers will themselves appoint a third
     appraiser within five (5) days after the two appraisals have been rendered.
     Such third appraiser will have fifteen (15) days in which to determine
     independently the Corporation's Fair Market Value.  The median of the three
     (3) appraised values shall be binding on all parties concerned as the
     Corporation's Fair Market Value.  The expenses of the appraisal will be
     borne solely by the Corporation.

          7E.  Additional Payments Upon Merger, Etc.  If at any time within one
               ------------------------------------                            
year after the date of redemption provided for in paragraph 7A, the Corporation
shall become party to one or more mergers, consolidations, sales of all or
substantially all of its
<PAGE>
 
assets or other similar corporate actions pursuant to which the holders of the
Corporation's Common Stock receive cash, securities or other property, or the
Corporation is acquired by the purchase of a majority of its shares of Common
Stock, or the Corporation or its stockholders enter into any agreement or letter
of intent contemplating any of the foregoing transactions, the Corporation
shall, simultaneously with the consummation of any such transaction or at such
later time as any payment described below is received by the Corporation or its
stockholders, make an additional payment to the holder or holders whose shares
of Preferred Stock were so redeemed by the Corporation in an amount equal to the
excess, if any, of the value per share of the cash, securities and other
property that such holder or holders would have received (or that the
Corporation received in which such holder or holders would have had a beneficial
interest) had the shares of Preferred Stock not been redeemed pursuant to
paragraph 7A, over the payment received by such holder or holders with respect
to such shares of Preferred Stock. Each payment made to such holder or holders
pursuant to this subparagraph 7E shall be made either in cash or in the form of
the securities and other property received by the holders of shares of Common
Stock of the Corporation.

          7F.  Redeemed or Otherwise Acquired Shares to be Retired.  Any shares
               ---------------------------------------------------             
of Preferred Stock redeemed pursuant to this paragraph 7 or otherwise acquired
by the Corporation in any manner whatsoever shall be cancelled and shall not
under any circumstances be reissued; and the Corporation may from time to time
take such appropriate corporate action as may be necessary to reduce accordingly
the number of authorized shares of Preferred Stock.

     8.  Amendments.  No provision of these terms of the Preferred Stock may be
         ----------                                                            
amended, modified or waived without the written consent or affirmative vote of
the holders of at least seventy-five percent (75%) of the then outstanding
shares of Preferred Stock, voting together as a single class.
<PAGE>
 
                           CERTIFICATE OF AMENDMENT

                                      OF

                         CERTIFICATE OF INCORPORATION

                                      OF

                           CREDIT TECHNOLOGIES, INC.


     Credit Technologies, Inc., a corporation organized and existing under and
by virtue of the General Corporation Law of the State of Delaware (the
"Corporation"), DOES HEREBY CERTIFY:

     That the following amendment to the Certificate of Incorporation of the
Corporation dated June 16, 1989, as amended on November 13, 1990, December 20,
1990, February 11, 1991, December 19, 1991 and June 7, 1993, has been duly
adopted in accordance with the provisions of Section 242 of the Delaware General
Corporation Law:

     That the Certificate of Incorporation of the Corporation be amended by:

     1.   deleting the words "seventy-five percent (75%)" from the seventh line
          of section 5 of Article Fourth and substituting therefor the words
          "two thirds";

     2.   deleting the words "seventy-five percent (75%)" from the fourth line
          of section 8 of Article Fourth and substituting therefor the words
          "two thirds";
<PAGE>
 
     IN WITNESS WHEREOF, Credit Technologies, Inc. has caused this certificate
to be signed by its President and attested by its Secretary this 27 day of   
August, 1993.


ATTEST                                       CREDIT TECHNOLOGIES, INC.


By: /s/ John D. Patterson, Jr.               By: /s/                        
   -----------------------------                -------------------------
   Secretary                                    Chairman of the Board
                                                  of Directors
<PAGE>
 
                           CERTIFICATE OF AMENDMENT
                                      OF
                         CERTIFICATE OF INCORPORATION
                         OF CREDIT TECHNOLOGIES, INC.


     Credit Technologies, Inc., a corporation organized and existing under and
by virtue of the General Corporation Law of the State of Delaware (the
"Corporation"), DOES HEREBY CERTIFY:

     FIRST:  That at a meeting of the Board of Directors of the Corporation,
             resolutions were duly adopted proposing and declaring advisable
             that the Certificate of Incorporation of the Corporation be amended
             and that such amendment be submitted to the stockholders of the
             Corporation for their consideration, as follows:

               RESOLVED:  That the Board of Directors recommends and deems it
                          advisable that the Certificate of Incorporation of the
                          Corporation be amended to change the name of the
                          Corporation to "Lightbridge, Inc."

               RESOLVED:  That the aforesaid proposed amendment be submitted to
                          the stockholders of the Corporation for their
                          consideration.

               RESOLVED:  That following the approval by the stockholders of the
                          aforesaid proposed amendment as required by law, the
                          officers of the Corporation be, and they hereby are,
                          and each of them hereby is, authorized and directed to
                          prepare, execute and file with the Secretary of State
                          of Delaware a Certificate of Amendment setting forth
                          the aforesaid amendment in the form approved by the
                          stockholders.

     SECOND: That in lieu of a meeting and vote of stockholders, the
             stockholders have given written consent to said amendment in
             accordance with the provisions of section 228 of the General
             Corporation Law of the State of Delaware, and written notice of the
             adoption of the amendment has been given as provided in section 228
             of the General Corporation Law of the State of Delaware to every
             stockholder entitled to such notice.

     THIRD:  That the aforesaid amendment was duly adopted in accordance with
             the applicable provisions of section
<PAGE>
 
             228 and section 242 of the General Corporation Law of the State of
             Delaware.

     IN WITNESS WHEREOF, said Credit Technologies, Inc. has caused this
certificate to be signed by Pamela D.A. Reeve, its President, and attested by
William G. Brown, its Assistant Secretary, this 1st day of November, 1994.


ATTEST:
                                             CREDIT TECHNOLOGIES, INC.



By: /s/ William G. Brown                     By: /s/ Pamela D.A. Reeve
    --------------------------                   ---------------------------
    Assistant Secretary                          President
<PAGE>
 
                           CERTIFICATE OF AMENDMENT

                                      OF

                         CERTIFICATE OF INCORPORATION

                                      OF

                               LIGHTBRIDGE, INC.


     Lightbridge, Inc., a corporation organized and existing under and by virtue
of the General Corporation Law of the State of Delaware (the "Corporation"),
does Hereby Certify:

     That the following amendment to the Certificate of Incorporation of the
corporation dated June 16, 1989, as heretofore amended, has been duly adopted in
accordance with the provisions of Section 242 of the Delaware General
Corporation Law:

     That the Certificate of Incorporation of the Corporation be amended by
deleting the old Article Fourth and inserting a new Article Fourth in its stead
which shall be and read as follows in its entirety:

     FOURTH:  The total number of shares of capital stock which the Corporation
shall have the authority to issue shall be 12,475,516 shares, of which
10,000,000 shall be shares of common stock, each of which shall have a par value
of $.01 (the "Common Stock"), and 2,475,516 shall be shares of preferred stock,
each of which shall have a par value of $.01 (the "Preferred Stock"), amounting
to an aggregate par value of $124,755.16.

     The following is a statement of the designations, powers, preferences and
rights, and the qualifications, limitations and restrictions, granted to or
imposed upon the respective classes of shares of capital stock of the
Corporation or the holders thereof:
<PAGE>
 
SERIES A, SERIES B, SERIES C AND SERIES D CONVERTIBLE PREFERRED STOCK

     1.   Number of Shares.  The series of Preferred Stock designated and known
          ----------------                                               
as "Series A Convertible Preferred Stock" shall consist of 630,516 shares. The
series of Preferred Stock designated and known as the "Series B Convertible
Preferred Stock" shall consist of 620,000 shares. The series of Preferred Stock
designated and known as "Series C Convertible Preferred Stock" shall consist of
225,000 shares. The series of Preferred Stock designated and known as "Series D
Convertible Preferred Stock" shall consist of 1,000,000 shares. The term
"Preferred Stock" used without reference to the Series A Convertible Preferred
Stock, the Series B Convertible Preferred Stock, the Series C Convertible
Preferred Stock or the Series D Convertible Preferred Stock means the Series A
Convertible Preferred Stock, the Series B Convertible Preferred Stock, the
Series C Convertible and the Series D Convertible Preferred Stock share for
share alike and without distinction as to series except as otherwise expressly
provided or as the context otherwise requires.

     2.   Voting.
          ------ 

          2A.  General.  Except as may be otherwise provided in these terms of
               -------                                                        
the Preferred Stock or by law, the Preferred Stock shall vote together with all
other classes and series of stock of the Corporation as a single class on all
actions to be taken by the stockholders of the Corporation, including, without
limitation, the election of directors of the Corporation. Notwithstanding the
foregoing or anything else to the contrary provided in the Certificate of
Incorporation, if the Corporation fails or refuses, for any reason or for no
reason, to redeem on the Redemption Date (as defined in paragraph 7) all of the
then outstanding shares of Preferred Stock in accordance with the terms and
provisions of paragraph 7, the holders of the Preferred Stock, voting together
as a single series, shall be entitled to elect a majority of the directors of
the Corporation. Each share of Preferred Stock shall entitle the holder thereof
to such number of votes per share on each such action as shall equal the number
of shares of Common Stock (including fractions of a share) into which each such
share of Preferred Stock is then convertible.

          2B.  Board Size.  The Corporation shall not, without the written 
               ----------                                                 
consent or affirmative vote of the holders of at least two-thirds of the then
outstanding shares of Preferred Stock, given in writing or by vote at a meeting,
consenting or, voting (as the case may be) together as a single series, increase
the maximum number of directors constituting the Board of Directors to a number
in excess of seven.

     3.   Dividends.  (a) If the Corporation has consolidated net after-tax
          ---------                                                        
income of $1,000,000 or more in any fiscal year, then, on the December 31
immediately following the end of such fiscal year, the Corporation shall pay
Accrued Dividends (as defined below) on the Series A Convertible Preferred
Stock,
<PAGE>
 
Series B Convertible Preferred Stock and Series C Convertible Preferred Stock on
a pro-rata basis to the extent of the lesser of 20% of consolidated net after-
tax income in excess of $1,000,000 or all Accrued Dividends then payable subject
to the prior consent of the Board of Directors of the Corporation, provided that
if the Board of Directors shall not consent to the payment of the Accrued
Dividends when such dividends would otherwise be required to be paid under this
Section 3(a), the amount of such Accrued Dividends shall be paid to the holders
of the Series A Convertible Preferred Stock, Series B Convertible Preferred
Stock and Series C Convertible Preferred Stock through the issuance of
subordinated notes to such holders with a principal amount equal to the Accrued
Dividends which would otherwise be required to be paid. Such subordinated notes
shall have a maturity date as determined by the Board but, in any event, will be
required to be paid in full promptly following the closing of any initial public
offering of Common Stock by the Company and shall accrue interest at the annual
rate of eight percent (8%). For purposes of this Section 3(a), "Accrued
Dividends" shall mean (i) with respect to the Series A Convertible Preferred
Stock, $.496 per share of Series A Convertible Preferred Stock, (ii) with
respect to the Series B Convertible Preferred Stock, $.524 per share of Series B
Convertible Preferred Stock, and (iii) with inspect to the Series C Convertible
Preferred Stock, $.632 per share of Series C Convertible Preferred Stock, in
each case, as such amounts shall be reduced by any payments under this paragraph
3(a). For the purpose of this paragraph 3(a), consolidated net after-tax income
shall be determined in accordance with generally accepted accounting principles,
consistently applied.

          (b)  From and after April 2, 1996, the holders of the then outstanding
Preferred Stock shall be entitled to receive, out of funds legally available
therefor, cumulative annual dividends when and as may be declared from time to
time by the Board of Directors of the Corporation at an annual rate per share
equal to eight percent (8%) of the original purchase price per share paid to the
Corporation for the Preferred Stock, such amount to be compounded annually such
that if the dividend is not paid for such year the unpaid amount shall be added
to the original purchase price per share paid to the Corporation for the
Preferred Stock for purposes of calculating succeeding years' dividends. Such
dividends shall be deemed to accrue on the Preferred Stock from April 2, 1996
and be cumulative, whether or not earned or declared and whether or not there
are profits, surplus or other funds of the Corporation legally available for the
payment of dividends. If such cumulative dividends in respect of any prior or
current annual dividend period shall not have been declared and paid or if there
shall not have been a sum sufficient for the payment thereof set apart, the
deficiency shall first be fully paid before any dividend or other distribution
shall be paid or declared and set apart with respect to any class of the
Corporation's capital stock, now or hereafter outstanding, except as
specifically provided in Section 3(a) above.
<PAGE>
 
          (c)  In the event the Corporation shall make or issue, or shall fix a
record date for the determination of holders of Common Stock entitled to
receive, a dividend or other distribution with respect to the Common Stock
payable in (i) cash or (ii) other property, other than securities of the
Corporation, then and in each such event the holders of Preferred Stock shall
receive, at the same time such distribution is made with respect to Common
Stock, such cash, the number of securities or such other assets of the
Corporation which they would have received had their Preferred Stock been
converted into Common Stock immediately prior to the record date for determining
holders of Common Stock entitled to receive such distribution.

     4.   Liquidation.  Upon any liquidation, dissolution or winding up of the 
          -----------                                                     
Corporation, whether voluntary or involuntary, the holders of the shares of
Preferred Stock shall first be entitled, before, any distribution or payment is
made upon any stock ranking on liquidation junior to the Preferred Stock, to be
paid an amount equal to the greater of (i) $1.586 per share in the case of each
share of Series A Convertible Preferred Stock, $1.75 per share in the case of
each such share of Series B Convertible Preferred Stock, $3.00 per share in the
case of each share of Series C Convertible Preferred Stork and $6.00 per share
in the case of each share of Series D Convertible Preferred Stock, plus, in the
case of each share, an amount equal to all accrued and unpaid dividends thereon
(whether or not declared) and any other dividends declared but unpaid thereon,
computed to the date payment thereof is made available, or (ii) such amount per
share as would have been payable had each such share of Preferred Stock been
converted to Common Stock pursuant to paragraph 6 immediately prior to such
liquidation, dissolution or winding up, and the holders of Preferred Stock shall
not be entitled to any further payment, such amount payable with respect to one
share of Preferred Stock being sometimes referred to as the "Liquidation
Preference Payment" and with respect to all shares of Preferred Stock being
sometimes referred to as the "Liquidation Preference Payments". If upon such
liquidation, dissolution or winding up of the Corporation, whether voluntary or
involuntary, the assets to be distributed among the holders of Preferred Stock
shall be insufficient to permit payment in full to the holders of Preferred
Stock of the Liquidation Preference Payments, then the entire assets of the
Corporation to be so distributed shall be distributed ratably, based upon
Liquidation Payments, among the holders of Preferred Stock. Upon any such
liquidation, dissolution or winding up of the Corporation, immediately after the
holders of Preferred Stock shall have been paid in full the Liquidation
Preference Payments, the remaining net assets of the Corporation available for
distribution may be distributed ratably among the holders of Common Stock.
Written notice of such liquidation, dissolution or winding up, stating a payment
date and the place where said payments shall be made, shall be given by mail,
postage prepaid, or by telex or telecopier to non-U.S. residents, not less than
20 days prior to the payment date stated therein, to the holders of record of
Preferred Stock, such notice to be addressed to each such holder at its address
as shown by the records of the Corporation. The consolidation or merger of the
Corporation into or with any other
<PAGE>
 
entity or entities which results in the exchange of outstanding shares of the
Corporation for securities or other consideration issued or paid or caused to be
issued or paid by any such entity or affiliate thereof (excluding any
consolidation or merger in which the shareholders of the Corporation hold more
than fifty percent (50%) of the voting securities of the surviving corporation),
and the sale or transfer by the Corporation of all or substantially all its
assets, shall be deemed to be a liquidation, dissolution or winding up of the
Corporation within the meaning of the provisions of this paragraph 4. For
purposes hereof, the Common Stock shall rank in liquidation junior to the
Preferred Stock.

     5.   Restrictions.  At any time when shares of Preferred Stock are
          ------------                                                 
outstanding, except where the vote or written consent of the holders of a
greater number of shares of the Corporation is required by law or by the
Certificate of Incorporation, and in addition to any other vote required by law
or the Certificate of Incorporation, without the approval of the holders of at
least two-thirds (2/3) of the then outstanding shares of Preferred Stock, given
in writing or by vote at a meeting, consenting or voting (as the case may be)
together as a single series, the Corporation will not:

          5A.  Create or authorize the creation of any additional class or
series of shares of stock unless the same ranks junior to the Preferred Stock as
to the distribution of assets on the liquidation, dissolution or winding up of
the Corporation, or increase the authorized amount of the Series A Convertible
Preferred Stock, Series B Convertible Preferred Stock, Series C Convertible
Preferred Stork or Series D Convertible Preferred Stock or increase the
authorized amount of any additional class or series of shares of stock unless
the same ranks junior to the Preferred Stock as to the distribution of assets on
the liquidation, dissolution or winding up of the Corporation, or create or
authorize any obligation or security convertible into shares of Series A
Convertible Preferred Stock, Series B Convertible Preferred Stock, Series C
Convertible Preferred Stock or Series D Convertible Preferred Stock or into
shares of any other class or series of stock unless the same ranks junior to the
Preferred Stock as to the distribution of assets on the liquidation, dissolution
or winding up of the Corporation, whether any such creation, authorization or
increase shall be by means of amendment to the Certificate of Incorporation or
by merger, consolidation or otherwise;

          5B.  Consent to any liquidation, dissolution or winding up of the
Corporation or consolidate or merge into or with any other entity or entities or
sell or transfer all or substantially all its assets;

          5C.  Amend, alter or repeal its Certificate of Incorporation or By-
laws so as to adversely affect the rights of the holders of the Series A
Convertible Preferred Stock, the Series B Convertible Preferred Stock, the
Series C Convertible Preferred Stock or Series D Convertible Preferred Stock;
<PAGE>
 
          5D.  Purchase or set aside any sums for the purchase of, or pay any
dividend or make any distribution on, any shares of stock other than the
Preferred Stock, except for dividends or other distributions payable on the
Common Stock solely in the form of additional shares of Common Stock and except
for the purchase of shares of Common Stock from former employees of the
Corporation who acquired such shares directly from the Corporation, if each such
purchase is made pursuant to contractual rights held by the Corporation relating
to the termination of employment of such former employee and the purchase price
does not exceed the original issue price paid by such former employee to the
Corporation for such shares; or

          5E.  Redeem or otherwise acquire any shares of Preferred Stock except
as expressly authorized in paragraph 7 hereof or pursuant to a purchase offer
made pro rata to all holders of shares of Preferred Stock on the basis of the
aggregate number of outstanding shares, of Preferred Stock then held by each
such holder.

     6.   Conversions.  The holders of shares of Preferred Stock shall have the
          -----------                                                      
following conversion rights:

          6A.  Right to Convert.  Subject to the terms and conditions of this
               ----------------                                              
paragraph 6, the holder of any share or shares of Preferred Stock shall have the
right, at its option at any time, to convert any such shares of Preferred Stock
(except that upon any liquidation of the Corporation the right of conversion
shall terminate at the close of business on the business day fixed for payment
of the amount distributable on the Preferred Stock) into such number of fully
paid and nonassessable shares of Common Stock as is obtained by (A) in the case
of the Series A Convertible Preferred Stock, (i) multiplying the number of
shares of Series A Convertible Preferred Stock so to be converted by $1.586 and
(ii) dividing the result by the conversion price of $1.586 per share or, in case
an adjustment of such price has taken place pursuant to the further provisions
of this paragraph 6, then by the conversion price as last adjusted and in effect
at the date any share or shares of Series A Convertible Preferred Stock are
surrendered for conversion; (B) in the case of the Series B Convertible
Preferred Stock, (i) multiplying the number of shares of Series B Convertible
Preferred Stock so to be converted by $1.75 and (ii) dividing the result by the
conversion price of $1.44241251 per share or, in case an adjustment of such
price has taken place pursuant to the further provisions of this paragraph 6,
then by the conversion price as last adjusted and in effect at the date any
share or shares of Series B Convertible Preferred Stock are surrendered for
conversion; (C) in the case of the Series C Convertible Preferred Stock, (i)
multiplying the number of shares of Series C Convertible Preferred Stock so to
be converted by $3.00 and (ii) dividing the result by the conversion price of
$2.50 per share, or, in the case an adjustment of such price has taken place
pursuant to the further provisions of this paragraph 6, then by the conversion
price as last adjusted and in effect at the date any share or shares of series C
Convertible Preferred Stock are surrendered for conversion; and (D) in the case
of the Series D Convertible Preferred Stock, (i) multiplying
<PAGE>
 
the number of shares of Series D Convertible Preferred Stock so to be converted
by $6.00 and (ii) dividing the result by the conversion price of $6.00 per share
or, in the case an adjustment of such price has taken place pursuant to the
further provisions of this paragraph 6, then by the conversion price as last
adjusted and in effect at the date any share or shares of Series D Convertible
Preferred Stock are surrendered for conversion. The conversion price set forth
in each of clause A(ii), clause B(ii), clause C(ii) and clause D(ii) hereof or
such price as last adjusted, being referred to as the "Conversion Price". Such
rights of conversion shall be exercised by the holder thereof by giving written
notice that the holder elects to convert a stated number of shares of Preferred
Stock into Common Stock and by surrender of a certificate or certificates for
the shares so to be converted to the Corporation at its principal office (or
such other office or agency of the Corporation as the Corporation may designate
by notice in writing to the holders of the Preferred Stock) at any time during
its usual business hours on the date set forth in such notice, together with a
statement of the name or names (with address) in which the certificate or
certificates for shares of Common Stock shall be issued.

          6B.  Issuance of Certificates; Time Conversion Effected.  Promptly 
               --------------------------------------------------           
after the receipt of the written notice referred to in subparagraph 6A and
surrender of the certificate or certificates for the share or shares of
Preferred Stock to be converted, the Corporation shall issue and deliver, or
cause to be issued and delivered, to the holder, registered in such name or
names as such holder may direct, a certificate or certificates for the number of
whole shares of Common Stock issuable upon the conversion of such share or
shares of Preferred Stock. To the extent permitted by law, such conversion shall
be deemed to have been effected and the applicable Conversion Price shall be
determined as of the close of business on the date on which such written notice
shall have been received by the Corporation and the certificate or certificates
for such share or shares shall have been surrendered as aforesaid, and at such
time the rights of the holder of such share or shares of Preferred Stock shall
cease, and the person or persons in whose name or names any certificate or
certificates for shares of Common Stock shall be issuable upon such conversion
shall be deemed to have become the holder or holders of record of the shares
represented thereby.

          6C.  Fractional Shares; Dividends; Partial Conversion.  No fractional
               ------------------------------------------------     
shares shall be issued upon conversion of Preferred Stock into Common Stock and
no payment or adjustment shall be made upon any conversion on account of any
cash dividends on the Common Stock issued upon such conversion. At the time of
each conversion, the Corporation shall pay, out of assets legally available
therefor, in cash an amount equal to all dividends excluding Accruing Dividends
and dividends payable pursuant to paragraph 3(b), declared and unpaid on the
shares of Preferred Stock surrendered for conversion to the date upon which such
conversion is deemed to take place as provided in subparagraph 6B. In case the
number of shares of Preferred Stock represented by the certificate or
certificates surrendered pursuant to subparagraph 6A exceeds the number of
shares
<PAGE>
 
converted, the Corporation shall, upon such conversion, execute and deliver to
the holder, at the expense of the Corporation, a new certificate or certificates
for the number of shares of Preferred Stock represented by the certificate or
certificates surrendered which are not to be converted. If any fractional share
of Common Stock would, except for the provisions of the first sentence of this
subparagraph 6C, be delivered upon such conversion, the Corporation, in lieu of
delivering such fractional share, shall pay to the holder surrendering the
Preferred Stock for conversion an amount in cash equal to the current market
price of such fractional share as determined in good faith by the Board of
Directors of the Corporation.

          6D.  Adjustment of Price Upon Issuance of Common Stock.  Except as
               -------------------------------------------------            
provided in subparagraph 6E, if and whenever the Corporation shall issue or
sell, or is, in accordance with subparagraphs 6D (1) through 6D (7), deemed to
have issued or sold, any shares of Common Stock for a consideration per share
less than any Conversion Price in effect immediately prior to the time of such
issue or sale, then, forthwith upon such issue or sale, such Conversion Price
shall be reduced to the price determined by dividing (i) an amount equal to the
sum of (a) the number of shares of Common Stock outstanding immediately prior to
such issue or sale (including the number of shares of Common Stock then issued
or issuable upon conversion of all issued and outstanding shares of Preferred
Stock) multiplied by the then existing Conversion Price and (b) the
consideration, if any, received by the Corporation upon such issue or sale, by
(ii) the total number of shares of Common Stock outstanding immediately after
such issue or sale (including the number of shares of Common Stock then issued
or issuable upon conversion of all issued and outstanding shares of Preferred
Stock).

     For purposes of this subparagraph 6D, the following subparagraphs 6D(l) to
6D(7) shall also be applicable:

               6D(1)  Issuance of Rights or Options.  In case at any time the
                      -----------------------------                          
     Corporation shall in any manner grant (whether directly or by assumption in
     a merger or otherwise) any warrants or other rights to subscribe for or to
     purchase, or any options for the purchase of, Common Stock or any stock or
     security convertible into or exchangeable for Common Stock (such warrants,
     rights or options being called "Options" and such convertible or
     exchangeable stock or securities being called "Convertible Securities")
     whether or not such Options or the right to convert or exchange any such
     Convertible Securities are immediately exercisable, and the price per share
     for which Common Stock is issuable upon the exercise of such options or
     upon the conversion or exchange of such Convertible Securities (determined
     by dividing (i) the total amount, if any, received or receivable by the
     Corporation as consideration for the granting of such Options, plus the
     minimum aggregate amount of additional consideration, payable to the
     Corporation upon the exercise of all such Options, plus, in the case of
     such Options which relate to Convertible Securities, the minimum aggregate
     amount of additional consideration, if any,
<PAGE>
 
     payable upon the issue or sale of such Convertible Securities and upon the
     conversion or exchange thereof, by (ii) the total maximum number of shares
     of Common Stock issuable upon the exercise of such Options or upon the
     conversion or exchange of all such Convertible Securities issuable upon the
     exercise of such Options) shall be less than any Conversion Price in effect
     lately prior to the time of the granting of such Options, then the total
     maximum number of shares of Common Stock issuable upon the exercise of such
     Options or upon conversion or exchange of the total maximum amount of such
     Convertible securities issuable upon the exercise of such Options shall be
     deemed to have been issued for such price per share as of the date of
     granting of such Options or the issuance of such Convertible Securities and
     thereafter shall be deemed to be outstanding. Except as otherwise provided
     in subparagraph 6D(3), no adjustment of any conversion Price shall be made
     upon the actual issue of such Common Stock or of such Convertible
     Securities upon exercise of such Options or upon the actual issue of such
     Common Stock upon conversion or exchange of such Convertible Securities.

               6D(2)  Issuance of Convertible Securities.  In case the
                      ----------------------------------              
     Corporation shall in any manner issue (whether directly or by assumption in
     a merger or otherwise) or sell any Convertible Securities, whether or not
     the rights to exchange or convert any such Convertible Securities are
     immediately exercisable, and the price per share for which Common Stock is
     issuable upon such conversion or exchange (determined by dividing (i) the
     total amount received or receivable by the corporation as consideration for
     the issue or sale of such Convertible Securities, plus the minimum
     aggregate amount of additional consideration, if any, payable to the
     Corporation upon the conversion or exchange thereof, by (ii) the total
     maximum number of shares of Common Stock issuable upon the conversion or
     exchange of all such Convertible Securities) shall be less than any
     Conversion Price in effect immediately prior to the time of such issue or
     sale, then the total maximum number of shares of Common Stock issuable upon
     conversion or exchange of all such Convertible Securities shall be deemed
     to have been issued for such price per share as of the date of the issue or
     sale of such Convertible Securities and thereafter shall be deemed to be
     outstanding, provided that (a) except as otherwise provided in subparagraph
     6D(3), no adjustment of any Conversion Price shall be made upon the actual
     issue of such Common Stock upon conversion or exchange of such Convertible
     Securities and (b) if any such issue or sale of such Convertible Securities
     is made upon exercise of any Options to purchase any such Convertible
     Securities for which adjustments of any Conversion Price have been or are
     to be made pursuant to other provisions of this subparagraph 6D, no further
     adjustment of such Conversion Price shall be made by reason of such issue
     or sale.

               6D(3)  Change in Option Price or Conversion Rate.  Upon the
                      -----------------------------------------           
     happening of any of the following events,
<PAGE>
 
     namely, if the purchase price provided for in any Option referred to in
     subparagraph 6D(1), the additional consideration, if any, payable upon the
     conversion or exchange of any Convertible Securities referred to in
     subparagraph 6D(1) or 6D(2), or the rate at which Convertible Securities
     referred to in subparagraph 6D(1) or 6D(2) are convertible into or
     exchangeable for Common Stock shall change at any time (including, but not
     limited to, changes under or by reason of provisions designed to protect
     against dilution), each Conversion Price in effect at the time of such
     event shall forthwith be readjusted to the Conversion Price which would
     have been in effect at such time had such Options or Convertible Securities
     still outstanding provided for such changed purchase price, additional
     consideration or conversion rate, as the case may be, at the time initially
     granted, issued or sold, but only if as a result of such adjustment the
     Conversion Price then in effect hereunder is thereby reduced; and on the
     expiration of any such Option or the termination of any such right to
     convert or exchange such Convertible Securities, each Conversion Price then
     in effect hereunder shall forthwith be increased to the Conversion Price
     which would have been in effect at the time of such expiration or
     termination had such Option or Convertible Securities, to the extent
     outstanding immediately prior to such expiration or termination, never been
     issued.

               6D(4)  Stock Dividends.  In case the Corporation shall declare a
                      ---------------                                          
     dividend or make any other distribution upon any stock of the Corporation
     payable in Common Stock (except for dividends or distributions upon the
     Common Stock), Options or Convertible Securities, any Common Stock, Options
     or Convertible Securities, as the case may be, issuable in payment of such
     dividend or distribution shall be deemed to have been issued or sold
     without consideration.

               6D(5)  Consideration for Stock.  In case any shares of Common
                      -----------------------                               
     Stock, Options or Convertible Securities shall be issued or sold for cash,
     the consideration received therefor shall be deemed to be the amount
     received by the Corporation therefor, without deduction therefrom of any
     expenses incurred or any underwriting commissions or concessions paid or
     allowed by the Corporation in connection therewith. In case any shares of
     Common Stock, Options or Convertible Securities shall be issued or sold for
     a consideration other than cash, the amount of the consideration other than
     cash received by the Corporation shall be deemed to be the fair value of
     such consideration as determined in good faith by the Board of Directors of
     the Corporation, without deduction of any expenses incurred or any
     underwriting commissions or concessions paid or allowed by the Corporation
     in connection therewith. In case any options shall be issued in connection
     with the issue and sale of other securities of the Corporation, together
     comprising one integral transaction in which no specific consideration is
     allocated to such Options by the parties thereto, such Options shall be
     deemed to have been issued
<PAGE>
 
     for such consideration as determined in good faith by the Board of
     Directors of the Corporation.

               6D(6)  Record Date.  In case the Corporation shall take a record
                      -----------                                              
     of the holders of its Common Stock for the purpose of entitling them (i) to
     receive a dividend or other distribution payable in Common Stock, Options
     or Convertible Securities or (ii) to subscribe for or purchase Common
     Stock, Options or Convertible Securities, then such record date shall be
     deemed to be the date of the issue or sale of the shares of Common Stock
     deemed to have been issued or sold upon the declaration of such dividend or
     the making of such other distribution or the date of the granting of such
     right of subscription or purchase, as the case may be.

               6D(7)  Treasury Shares.  The number of shares of Common Stock
                      ---------------                                       
     outstanding at any given time shall not include shares owned or held by or
     for the account of the Corporation, and the disposition of any such shares
     shall be considered an issue or sale of Common Stock for the purpose of
     this subparagraph 6D.

          6E.  Certain Issues of Common Stock and Other Events Excepted.  
               --------------------------------------------------------  
Anything herein to the contrary notwithstanding, the Corporation shall not be
required to make any adjustment of any Conversion Price in the case of the
issuance of (i) up to an aggregate of 836,350 shares ("Reserved Shares")
(appropriately adjusted to reflect the occurrence of any event described in
subparagraph 6F) of Common Stock or Options therefor (including Options to
purchase 536,350 shares of Common Stock outstanding on and Options to purchase
300,000 shares of Common Stock which may be granted after April 1, 1996) to
directors, officers, employees or consultants of the Corporation in connection
with their service to the Corporation or their employment by the Corporation
(Any options, or portion thereof, currently outstanding or hereafter issued by
the Company which expire or terminate unexercised and any shares of Common Stock
issued upon exercise of any options currently outstanding or upon exercise of
any options hereafter issued by the Company which are repurchased by the Company
at a purchase price per share no greater than the price per share paid to the
Company upon exercise of such options shall not reduce the number of "Reserved
Shares"), (ii) shares of Common Stock issued upon conversion of the Preferred
Stock and (iii) up to an aggregate of 622,122 shares of Common Stock issued upon
the exercise of warrants, outstanding as of April 1, 1996, to purchase shares of
Common Stock. Any shares of Common Stock issued pursuant to clause (i) of this
subparagraph 6E which are hereinafter repurchased by the Corporation at a
purchase price per share no greater than the price per share paid to the
Corporation upon the issuance of such shares shall again be available for
issuance pursuant to clause (i) of this subparagraph 6E.

          6F.  Subdivision or Combination of Common Stock.  In case the
               ------------------------------------------              
Corporation shall at any time subdivide (by any stock split, stock dividend or
otherwise) its outstanding shares of
<PAGE>
 
Common Stock into a greater number of shares, each Conversion Price in effect
immediately prior to such subdivision shall be proportionately reduced, and,
conversely, in case the outstanding shares of Common Stock shall be combined
into a smaller number of shares, each Conversion Price in effect immediately
prior to such combination shall be proportionately increased.

          6G.  Reorganization or Reclassification.  If any capital 
               ----------------------------------                 
reorganization or reclassification of the capital stock of the Corporation shall
be effected in such a way that holders of Common Stock shall be entitled to
receive stock, securities or assets with respect to or in exchange for Common
Stock, then, as a condition of such reorganization or reclassification, lawful
and adequate provisions shall be made whereby each holder of a share or shares
of Preferred Stock shall thereupon have the right to receive, upon the basis and
upon the terms and conditions specified herein and in lieu of the shares of
Common Stock immediately theretofore receivable upon the conversion of such
share or shares of Preferred Stock, such shares of stock, securities or assets
as may be issued or payable with respect to or in exchange for a number of
outstanding shares of such Common Stock equal to the number of shares of such
Common Stock immediately theretofore receivable upon such conversion had such
reorganization or reclassification not taken place, and in any such case
appropriate provisions shall be made with respect to the rights and interests of
such holder to the end that the provisions hereof (including without limitation
provisions for adjustments of the Conversion Prices) shall thereafter be
applicable, as nearly as may be, in relation to any shares of stock, securities
or assets thereafter deliverable upon the exercise of such conversion rights.

          6H.  Notice of Adjustment.  Upon any adjustment of the Conversion 
               --------------------                                        
Price of any series of Preferred Stock, then and in each such case the
Corporation shall give written notice thereof, by first class mail, postage
prepaid, or by telex or telecopier to non-U.S. residents, addressed to each
holder of shares of such series of Preferred Stock at the address of such holder
as shown on the books of the Corporation, which notice shall state the
Conversion Price resulting from such adjustment, setting forth in reasonable
detail the method upon which such calculation is based.

          6I.  Other Notices.  In case at any time:
               -------------                       

               (1)  the Corporation shall declare any dividend upon its Common
     Stock payable in cash or stock or make any other distribution to the
     holders of its Common Stock;

               (2)  the Corporation shall offer for subscription pro rata to the
     holders of its Common Stock any additional shares of stock of any class or
     other rights;

               (3)  there shall be any capital reorganization or
     reclassification of the capital stock of the Corporation, or a
     consolidation or merger of the
<PAGE>
 
     Corporation with or into, or a sale of all or substantially all its assets
     to, another entity or entities; or

               (4)  there shall be a voluntary or involuntary dissolution,
     liquidation or winding up of the Corporation;

then, in any one or more of said cases, the Corporation shall give, by first
class mail, postage prepaid, or by telex or telecopier to non-U.S. residents,
addressed to each holder of any shares of Preferred Stock at the address of such
holder as shown on the books of the Corporation, (a) at least 20 days' prior
written notice of the date on which the books of the Corporation shall close or
a record shall be taken for such dividend, distribution or subscription rights
or for determining rights to vote in respect of any such reorganization,
reclassification, consolidation, merger, sale, dissolution, liquidation or
winding up and (b) in the case of any such reorganization, reclassification,
consolidation, merger, sale, dissolution, liquidation or winding up, at least 20
days' prior written notice of the date when the same shall take place. Such
notice in accordance with the foregoing clause (a) shall also specify, in the
case of any such dividend, distribution or subscription rights, the date on
which the holders of Common Stock shall be entitled thereto and such notice in
accordance with the foregoing clause (b) shall also specify the date on which
the holders of Common Stock shall be entitled to exchange their Common Stock for
securities or other property deliverable upon such reorganization,
reclassification, consolidation, merger, sale, dissolution, liquidation or
winding up, as the case may be.

          6J.  Stock to be Reserved.  The Corporation will at all times reserve
               --------------------                                    
and keep available out of its authorized Common Stock, solely for the purpose of
issuance upon the conversion of Preferred Stock as herein provided, such number
of shares of Common Stock as shall then be issuable upon the conversion of all
outstanding shares of Preferred Stock. The Corporation covenants that all shares
of Common Stock which shall be so issued shall be duly and validly issued and
fully paid and nonassessable and free from all taxes, liens and charges with
respect to the issue thereof, and, without limiting the generality of the
foregoing, the Corporation covenants that it will from time to time take all
such action as may be requisite to assure that the par value per share of the
Common Stock is at all times equal to or less than the Conversion Prices in
effect at the time. The Corporation will take all such action as may be
necessary to assure that all such shares of Common Stock may be so issued
without violation of any applicable law or regulation, or of any requirement of
any national securities exchange upon which the Common Stock may be listed. The
Corporation will not take any action which results in any adjustment of any
Conversion Price if the total number of shares of Common Stock issued and
issuable after such action upon conversion of the Preferred Stock would exceed
the total number of shares of Common Stock then authorized by its Certificate of
Incorporation.
<PAGE>
 
          6K.  No Reissuance of Preferred Stock.  Shares of Preferred Stock
               --------------------------------                            
which are converted into shares of Common Stock as provided herein shall not be
reissued.

          6L.  Issue Tax.  The issuance of certificates for shares of Common
               ---------                                                    
Stock upon conversion of Preferred Stock shall be made without charge to the
holders thereof for any issuance tax in respect thereof, provided that the
Corporation shall not be required to pay any tax which may be payable in respect
of any transfer involved in the issuance and delivery of any certificate in a
name other than that of the holder of the Preferred stock which is being
converted.

          6M.  Closing of Books.  The Corporation will at no time close its
               ----------------                                            
transfer books against the transfer of any Preferred Stock or of any shares of
Common Stock issued or issuable upon the conversion of any shares of Preferred
Stock in any manner which interferes with the timely conversion of such
Preferred Stock, except as may otherwise be required to comply with applicable
securities laws.

          6N.  Definition of Common Stock.  As used in this paragraph 6, the
               --------------------------                                   
term "Common Stock" shall mean and include the Corporation's authorized Common
Stock, par value $.01 per share, as constituted on the date of filing of these
terms of the Preferred Stock, and shall also include any capital stock of any
class of the Corporation thereafter authorized which shall neither be limited to
a fixed sum or percentage of par value in respect of the rights of the holders
thereof to participate in dividends nor entitled to a preference in the
distribution of assets upon the voluntary or involuntary liquidation,
dissolution or winding up of the Corporation; provided that the shares of Common
Stock receivable upon conversion of shares of Preferred Stock shall include only
shares designated as Common Stock of the Corporation on the date of filing of
this instrument, or in case of any reorganization or reclassification of the
outstanding shares thereof, the stock, securities or assets provided for in
subparagraph 6G.

          6O.  Mandatory Conversion.  If at any time (A) the Corporation shall
               --------------------                                           
effect a firm commitment underwritten public offering of shares of Common Stock
in which (i) the aggregate price paid for such shares by the public shall be at
least $7,500,000 and (ii) the price paid by the public for such shares shall be
at least $10.00 per share (appropriately adjusted to reflect the occurrence of
any event described in subparagraph 6F) or (B) there shall be less than ten
percent (10%) of the originally issued shares of Preferred Stock outstanding,
then effective upon the closing of the sale of such shares by the Corporation
pursuant to such public offering or such reduction in the number of shares of
Preferred Stock, as the case may be, all outstanding shares of Preferred Stock
shall automatically and without any further action on the part of the
Corporation convert to shares of Common Stock.

     7.   Redemption.  The shares of Preferred Stock shall be redeemed as
          ----------                                                     
follows:
<PAGE>
 
          7A.  Optional Redemption.  Commencing on and from April 1, 2000, and
               -------------------                                            
on the same date in each following year, the holders of at least two-thirds of
the shares of the Preferred Stock then outstanding ("Requesting Holders") may
request the Corporation to redeem one-third (1/3) of the outstanding Preferred
Stock held by such Requesting Holders at the redemption price described
paragraph 7B below. The Requesting Holders shall give the Corporation notice, by
mail, postage prepaid (un "Optional Redemption Notice"), at least 10, but no
more than 90, days prior to the date fixed for redemption pursuant to this
paragraph 7A of their election to effect a redemption of shares of Preferred
Stock. Upon receipt of an Optional Redemption Notice, the Company shall notify
all holders of Preferred Stock who are not Requesting Holders ("Non-Requesting
Holders") of the redemption request, and each Non-Requesting Holder shall have
30 days from the date of such notice to redeem, at the redemption price
described in paragraph 7(B) below, the same percentage of Preferred Shares held
by such Non-Requesting Holders as has been requested for redemption by the
Requesting Holders. The redemption price described in paragraph 7B below shall
be paid on the time and date (the "Redemption Date") and at the place fixed for
redemption and specified in the Optional Redemption Notice upon surrender to the
Corporation of certificates representing the shares of Preferred Stock to be
redeemed.

          7B.  Redemption Price and Payment.  The Preferred Stock to be redeemed
               ----------------------------                            
on the Redemption Date shall be redeemed by paying for each share in cash an
amount equal to the greater of (i) the Liquidation Preference Payment for such
Preferred Stock and (ii) the Fair Market Value as of the date ninety (90) days
prior to the applicable Redemption Date (the "Valuation Date") , such amount
being referred to as the "Redemption Price". Such payment shall be made in full
on the Redemption Date to the holders entitled thereto.

          7C.  Redemption Mechanics.  From and after the close of business on 
               --------------------                                          
the Redemption Date, unless there shall have been a default in the payment of
the Redemption Price, all rights of holders of shares of Preferred Stock whose
shares are to be redeemed on such Redemption Date (except the right to receive
the Redemption Price) shall cease with respect to such shares, and such shares
shall not thereafter be transferred on the books of the Corporation or be deemed
to be outstanding for any purpose whatsoever. If the funds of the Corporation
legally available for redemption of shares of Preferred Stock on the Redemption
Date are insufficient to redeem the total number of outstanding shares of
Preferred Stock then to be redeemed, the holders of such shares of Preferred
Stock shall share ratably, based upon Liquidation Payments, in any funds legally
available for redemption of such shares according to the respective amounts
which would be payable with respect to the full number of shares owned by them
if all such outstanding shares were redeemed in full. The shares of Preferred
Stock due for redemption but not redeemed shall remain outstanding and entitled
to all rights and preferences provided herein. At any time thereafter when
additional funds of the Corporation are legally available for the redemption of
such shares of Preferred Stock, such funds will be
<PAGE>
 
used, at the end of the next succeeding fiscal quarter, to redeem the balance of
such shares, or such portion thereof for which funds are then legally available,
on the basis set forth above.

          7D.  Fair Market Value.  For the purposes of this paragraph 7, "Fair
               -----------------                                              
Market Value" per share of Preferred Stock shall mean:

               7D(1) if the Corporation's Common Stock is publicly traded, an
     amount (A) equal to (x) the average on the Valuation Date of the high and
     low prices of the Common Stock on the principal national securities
     exchange on which the Common Stock is traded, if such stock is then traded
     on a national securities exchange; or (y) last reported sale price on the
     Valuation Date of the Common Stock on the Nasdaq National Market System, if
     the Common Stock is not then traded on a national securities exchange; or
     (z) the closing bid price (or average of bid prices) last quoted on the
     Valuation Date by an established quotation service for over-the-counter
     securities, if the Common Stock is not reported on the Nasdaq National
     Market System, (B) multiplied by the number of shares of Common Stock
     (including fractions of a share) into which each share of Preferred Stock
     may be converted as of the Valuation Date; or

               7D(2) if the Corporation's Common Stock is not publicly traded as
     provided in subparagraph 7(D)(1) above, an amount (A) determined by
     dividing the Corporation's Fair Market Value, determined as of the
     Valuation Date, by the number of actual outstanding shares of Common Stock,
     on a fully-diluted basis, as of the Valuation Date, (B) multiplied by the
     number of shares of Common Stock (including fractions of a share) into
     which each share of Preferred Stock may be converted as of the Valuation
     Date, The Corporation's Fair Market Value shall be the price which could be
     obtained for one hundred percent (100%) of the equity interest in the
     Corporation on a consolidated basis if the Corporation were sold to a
     willing buyer by a willing seller in a single arm's length transaction,
     determined by considering the Corporation's profits after tax, book value,
     revenues and cash flow as of the Valuation Date.

               In the event that the Fair Market Value per share of Common Stock
     is to be determined pursuant to subparagraph 7D(2) above then, in such
     event, on or before thirty (30) days after the Valuation Date, a
     representative of the Corporation and a representative of the holder or
     holders of a majority of the then outstanding shares of Preferred Stock
     will use their best efforts to reach agreement on the Corporation's Fair
     Market Value. If they are unable to reach such agreement within ten (10)
     days after the end of such period, the Corporation and such holder or
     holders will agree on the selection of an independent appraiser. Such
     appraiser will have fifteen (15) days in which to determine the
     Corporation's Fair Market Value, and its determination thereof will be
     final
<PAGE>
 
     and binding on all parties concerned. If the Corporation and such holder or
     holders are unable to reach an agreement as to an independent appraiser
     within five (5) days after the aforesaid ten (10) day period, then two
     appraisers will be appointed within five (5) days thereafter to determine
     the Corporation's Fair Market Value, one by the Corporation and one by the
     holder or holders of a majority of the then outstanding shares of Preferred
     Stock. Each of the Corporation and such holder or holders will cause their
     appraiser to determine independently the Corporation's Fair Market Value
     within fifteen (15) days after the time of their appointment. If the lesser
     of the two appraised values so determined (the "Low Value") exceeds or is
     equal to ninety percent (90%) of the value of the greater of the two
     appraised values (the "High Value"), the Corporation's Fair Market Value
     will be deemed to be equal to the average of tho two appraisals. If the Low
     Value is less than ninety percent (90%) of the High Value, the two
     appraisers will themselves appoint a third appraiser within five (5) days
     after the two appraisals have been rendered. Such third appraiser will have
     fifteen (15) days in which to determine independently the Corporation's
     Fair Market Value. The median of the three (3) appraised values shall be
     binding on all parties concerned as the Corporation's Fair Market Value.
     The expenses of the appraisal will be borne solely by the Corporation.

          7E.  Redeemed or Otherwise Acquired Shares to be Retired.  Any shares
               ---------------------------------------------------      
of Preferred Stock redeemed pursuant to this paragraph 7 or otherwise acquired
by the Corporation in any manner whatsoever shall be cancelled and shall not
under any circumstances be reissued; and the Corporation may from time to time
take such appropriate corporate action as may be necessary to reduce accordingly
the number of authorized shares of Preferred Stock.

     8.   Amendments.  No provision of these terms of the Preferred Stock may be
          ----------                                                         
amended, modified or waived without the written consent or affirmative vote of
the holders of at least two-thirds (2/3) of the then outstanding shares of
Preferred Stock, voting together as a single class.

     IN WITNESS WHEREOF, Lightbridge, Inc. has caused this certificate to be
signed by its President this ____ day of April, 1996.

                                                  LIGHTBRIDGE, INC.



                                                  By:/s/ Pamela D.A. Reeve
                                                     ----------------------
                                                     Its President

<PAGE>
 
                                                                     Exhibit 3.2
 
                              AMENDED AND RESTATED

                          CERTIFICATE OF INCORPORATION

                                       OF

                               LIGHTBRIDGE, INC.


     The following Amended and Restated Certificate of Incorporation: (i) amends
and restates the provisions of the Certificate of Incorporation of Lightbridge,
Inc. (the "Corporation") originally filed with the Secretary of State of the
State of Delaware on June 16, 1989, as amended to date; (ii) supersedes the
Certificate of Incorporation and all amendments thereto and restatements
thereof; and (iii) has been duly proposed by the Board of Directors of the
Corporation and duly adopted by the stockholders of the Corporation in
accordance with the provisions of Sections 228, 242 and 245 of the Delaware
General Corporation Law.

     FIRST:  The name of the corporation (the "Corporation") is Lightbridge,
     -----                                                                  
Inc.

     SECOND:  The address of the registered office of the Corporation in the
     ------                                                                 
State of Delaware is 229 South State Street, Dover, County of Kent, and the name
of its registered agent at such address is The Prentice-Hall Corporation System,
Inc.

     THIRD:  The nature of the business or purpose to be conducted or promoted
     -----                                                                    
is as follows:

     To engage in the business of designing, developing, marketing, licensing,
buying and selling computer software of all types and descriptions; to provide
computer and computer software related consulting services, including but not
limited to software installation, development, consulting and any other
activities related thereto.

     To acquire, hold, dispose of, buy, sell, underwrite, handle on commission
and otherwise deal in stocks, shares, bonds, notes and obligations of the
interests in corporations, joint-stock companies, trusts, associations,
partnerships, firms or persons and all forms of public and municipal securities
of this or any other country, or any right or interest therein, and while owner
thereof, to exercise all rights, powers and privileges of ownership in the same
manner and to the same extent that an individual might.
<PAGE>
 
     To acquire, hold, use, construct, maintain and dispose of buildings,
plants, factories, mills, machinery, works and all other real and personal
property, tangible or intangible, of whatever kind and wherever situated, or any
right or interest therein for the purposes of the foregoing businesses, and as a
going business or otherwise, all or any part of the assets of any corporation,
joint-stock company, trust, association, firm or person, and in such cases to
assume all or any part of its, his or her liabilities.

     To engage in, transact and carry on any or all of the above businesses or
any other business or activity necessary or convenient for or incidental to any
or all of the foregoing or which can advantageously be conducted in connection
therewith, and to engage in, transact and carry on any business or lawful act or
activity for which corporations may be organized under the General Corporation
Law of Delaware.

     FOURTH:  The total number of shares of all classes of capital stock which
     ------                                                                   
the Corporation shall have authority to issue shall be 65,000,000, consisting
of (i) 60,000,000 shares of common stock, par value $.01 per share ("Common
Stock"), and (ii) 5,000,000 shares of preferred stock, par value $.01 per
share ("Preferred Stock").

     The following is a statement of the designations and the powers, privileges
and rights, and the qualifications, limitations or restrictions thereof in
respect of each class of capital stock of the Corporation:

A.  COMMON STOCK.
    ------------ 

     1.  General.  The voting, dividend and liquidation rights of the holders of
         -------                                                                
the Common Stock are subject to and qualified by the rights of the holders of
the Preferred Stock of any series as may be designated by the Board of Directors
upon any issuance of the Preferred Stock of any series.

     2.  Voting.  The holders of Common Stock will be entitled to one vote per
         ------                                                               
share on all matters to be voted on by the stockholders of the Corporation.
There shall be no cumulative voting.

     3.  Dividends.  Dividends may be declared and paid on the Common Stock from
         ---------                                                              
funds lawfully available therefor as and when determined by the Board of
Directors and subject to any preferential dividend rights of any then
outstanding Preferred Stock.

     4.  Liquidation.  Upon the dissolution or liquidation of the Corporation,
         -----------                                                          
whether voluntary or involuntary, holders of Common Stock will be entitled to
receive all assets of the Corporation available for distribution to its
stockholders, subject to any preferential liquidation rights of any then
outstanding Preferred Stock.

B.   PREFERRED STOCK.
     --------------- 

     Preferred Stock may be issued from time to time in one or more series, each
of such series to have such terms as stated or expressed herein and in the
resolution or resolutions providing for the issue of such series adopted by the
Board of Directors of the Corporation as hereinafter provided.  No share of
Preferred Stock that is redeemed, purchased or 
<PAGE>
 
acquired by the Corporation may be reissued except as otherwise provided herein
or by law. Different series of Preferred Stock shall not be construed to
constitute different classes of shares for the purposes of voting by classes
unless expressly provided herein, in any such resolution or resolutions, or by
law.

     Authority is hereby expressly granted to the Board of Directors from time
to time to issue the Preferred Stock in one or more series, and in connection
with the creation of any such series, by resolution or resolutions providing for
the issue of the shares thereof, to determine and fix such voting powers, full
or limited, or no voting powers, and such designations, preferences and relative
participating, optional or other special rights, and qualifications, limitations
or restrictions thereof, including without limitation thereof, dividend rights,
conversion rights, redemption privileges and liquidation preferences, as shall
be stated and expressed in such resolutions, all to the full extent now or
hereafter permitted by the General Corporation Law of Delaware.  Without
limiting the generality of the foregoing, the resolutions providing for issuance
of any series of Preferred Stock may provide that such series shall be superior
or rank equally or be junior to the Preferred Stock of any other series to the
extent permitted by law.  Except as otherwise provided by law or by this Amended
and Restated Certificate of Incorporation, no vote of the holders of the
Preferred Stock or Common Stock shall be a prerequisite to the issuance of any
shares of any series of the Preferred Stock authorized by and complying with the
conditions of the Amended and Restated Certificate of Incorporation, the right
to have such vote being expressly waived by all present and future holders of
the capital stock of the Corporation.

     FIFTH:  In furtherance of and not in limitation of powers conferred by
     -----                                                                 
statute, it is further provided that:

          (a) Subject to the limitations and exceptions, if any, contained in
the by-laws of the Corporation, the by-laws may be adopted, amended or repealed
by the Board of Directors of the Corporation.

          (b) Elections of directors need not be by written ballot.

          (c) Subject to any applicable requirements of law, the books of the
Corporation may be kept outside the State of Delaware at such location as may be
designated by the Board of Directors or in the by-laws of the Corporation.

     SIXTH:  The Corporation is to have perpetual existence.
     -----                                                  

     SEVENTH:  The Corporation shall indemnify each person who at any time is,
     -------                                                                  
or shall have been a director or officer of the Corporation, and is threatened
to be or is made a party to any threatened, pending or completed action, suit or
proceeding, whether civil, criminal, administrative or investigative, by reason
of the fact that he is, or was, a director or officer of the Corporation, or
served at the request of the Corporation as a director, officer, employee,
trustee, or agent of another corporation, partnership, joint venture, trust or
other enterprise, against expenses (including attorneys' fees), judgments, fines
and amounts paid in settlement incurred in connection with any such action, suit
or proceeding to the maximum extent permitted by the General Corporation Law of
the State of Delaware.  


                                      -3-
<PAGE>
 
The foregoing right of indemnification shall in no way be exclusive of any other
rights of indemnification to which any such director or officer may be entitled,
under any by-law,  agreement, vote of directors or stockholders or otherwise.
No amendment to or repeal of the provisions of this paragraph shall deprive a
person of the benefit of this paragraph with respect to any act or failure to
act of such director occurring prior to such amendment or repeal.

     EIGHTH:  Whenever a compromise or arrangement is proposed between this
     ------                                                                
Corporation and its creditors or any class of them and/or between this
Corporation and its stockholders or any class of them, any court of equitable
jurisdiction within the State of Delaware may, on the application in a summary
way of this Corporation or of any creditor or stockholder thereof, or on the
application of any receiver or receivers appointed for this Corporation under
the provisions of Section 291 of Title 8 of the Delaware Code or on the
application of trustees in dissolution or of any receiver or receivers appointed
for this Corporation under the provisions of Section 279 of Title 8 of the
Delaware Code order a meeting of the creditors or class of creditors, and/or of
the stockholders or class of stockholders of this Corporation, as the case may
be, to be summoned in such manner as the said court directs.  If a majority in
number representing three-fourths in value of the creditors or class of
creditors, and/or of the stockholders or class of stockholders of this
Corporation, as the case may be, agree to any compromise or arrangement and to
any reorganization of this Corporation as a consequence of such compromise or
arrangement, the said compromise or arrangement and the said reorganization
shall, if sanctioned by the court to which the said application has been made,
be binding on all the creditors or class of creditors, and/or on all the
stockholders or class of stockholders of this Corporation, as the case may be,
and also on this Corporation.

     NINTH:  To the maximum extent permitted by the General Corporation Law of
     -----                                                                    
the State of Delaware as the same exists or may hereafter be amended, no
director of the Corporation shall be personally liable to the Corporation or to
any of its stockholders for monetary damages arising out of such director's
breach of fiduciary duty as a director of the Corporation.  No amendment to or
repeal of the provisions of this paragraph shall apply to or have any effect on
the liability or the alleged liability of any director of the Corporation with
respect to any act or failure to act of such director occurring prior to such
amendment or repeal.

     TENTH:  The Corporation reserves the right to amend, alter, change or
     -----                                                                
repeal any provision contained in this Amended and Restated Certificate of
Incorporation, in the manner now or hereafter prescribed by statute and this
Amended and Restated Certificate of Incorporation, and all rights conferred upon
stockholders herein are granted subject to this reservation.

     ELEVENTH: Any action required or permitted to be taken by the stockholders
     --------
of the Corporation must be effected at a duly constituted annual or special
meeting of stockholders and may not be effected by any consent in writing by
such stockholders. Notwithstanding any other provisions of law, this Amended and
Restated Certificate of Incorporation or the by-laws of the Corporation, each as
amended, and notwithstanding the fact that a lesser percentage may be specified
by law, the affirmative vote of the holders of at least seventy-five percent
(75%) of the shares of capital stock of the Corporation issued and outstanding
and entitled to vote shall be required to amend or repeal, or to adopt any
provision inconsistent with, this Article ELEVENTH.



                                      -4-
<PAGE>
 
     IN WITNESS WHEREOF, the undersigned, being the duly elected and acting
President of Lightbridge, Inc., does hereby declare that this Amended and
Restated Certificate of Incorporation has been duly adopted by the Board of
Directors and the stockholders of this Corporation in accordance with the
provisions of Sections 228, 242 and 245 of the General Corporation Law of the
State of Delaware.  The undersigned does hereby affirm, under the penalties of
perjury, that this instrument is the act and deed of the Corporation and the
facts herein set forth are true and correct.  I have accordingly hereunto set my
hand this      day of                , 1996.


                                                  LIGHTBRIDGE, INC.
  
  
  
                                                  By:
                                                     ------------------------
                                                     Its President


                                      -5-

<PAGE>
 
                                                                     EXHIBIT 4.1


Engraved specimen stock certificate of Company bearing the Company logo and the
following text:

[Obverse of Certificate]

LIGHTBRIDGE, INC.

INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

                                                               CUSIP 532226 10 7
This Certifies that
                                             SEE REVERSE FOR CERTAIN DEFINITIONS

is the owner of

fully paid and non-assessable shares of the COMMON STOCK, $.01 par value, of

Lightbridge, Inc.

transferable on the books of the Corporation in person or by duly authorized
attorney upon surrender of this Certificate properly endorsed.

  This Certificate and the shares represented hereby are issued and held subject
to the laws of The State of Delaware, the Certificate of Incorporation of the
Corporation, as amended, and the By-Laws of the Corporation, as amended.

  This Certificate is not valid unless countersigned and registered by the
Transfer Agent and Registrar.

IN WITNESS WHEREOF, the Corporation has caused this Certificate to be executed
by the facsimile signatures of its duly authorized officers and sealed with the
facsimile seal of the Corporation.

Dated:

[Corporate seal bearing text:] LIGHTBRIDGE, INC. - 1989 - Delaware - *

/s/ William G. Brown
Treasurer

/s/ Pamela D.A. Reeve
President

COUNTERSIGNED AND REGISTERED:

     AMERICAN STOCK TRANSFER AND TRUST COMPANY
     TRANSFER AGENT AND REGISTRAR

By
Authorized signature
<PAGE>
 
[Reverse of Certificate]

LIGHTBRIDGE, INC.

THE CORPORATION IS AUTHORIZED TO ISSUE MORE THAN ONE CLASS OF STOCK.  THE
CORPORATION WILL FURNISH WITHOUT CHARGE TO EACH STOCKHOLDER WHO SO REQUESTS A
STATEMENT OF THE POWERS, DESIGNATIONS, PREFERENCES AND RELATIVE, PARTICIPATING,
OPTIONAL OR OTHER SPECIAL RIGHTS OF EACH CLASS OF STOCK OR SERIES THEREOF AND
THE QUALIFICATIONS, LIMITATIONS OR RESTRICTIONS OF SUCH PREFERENCES AND/OR
RIGHTS.


  The following abbreviations, when used in the inscription on the face of this
certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM - as tenants in common
TEN ENT - as tenants by the entireties
JT TEN - as joint tenants with right of survivorship and not as tenants in
common

UNIF GIFT MIN ACT - _____________ Custodian ________________
                            (Cust)                      (Minor)
                         under Uniform Gifts to Minors
                         Act _____________
                                  (State)

     Additional abbreviations may also be used though not in the above list.


     For value received, __________ hereby sell, assign, and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE  [Box]

- --------------------------------------------------------------------------------
(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

______________ shares of the common stock represented by the within Certificate,
and do hereby irrevocably constitute and appoint _________________ Attorney to
transfer the said stock on the books of the within named Corporation with full
power of substitution in the premises.

Dated, ____    ________________________________________________________________

               NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE
               NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY
               PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE
               WHATEVER.


Signature(s) Guaranteed:
- --------------------------------------------------------------------------------
THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION
(BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH
MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO
S.E.C. RULE 17Ad-15.



                                      -2-

<PAGE>
 
                                  August 27, 1996


Lightbridge, Inc.
281 Winter Street
Waltham, Massachusetts 02154

Ladies and Gentlemen:

   This opinion is furnished to you in connection with Amendment No. 2 to
Registration Statement on Form S-1 (Registration No. 333-6589) (the
"Registration Statement") being filed on the date hereof by Lightbridge, Inc., a
Delaware corporation (the "Company"), with the Securities and Exchange
Commission under the Securities Act of 1933, as amended.  The Registration
Statement relates to the proposed public offering by the Company of 3,021,868
shares (the "Company Shares") of its Common Stock, $.01 par value per share, to
be issued by the Company, and the proposed public offering by certain
securityholders of the Company of 1,348,132 shares of such Common Stock,
consisting of certain shares (the "Outstanding Shares") that are currently
issued and outstanding and certain shares (the "Warrant Shares") that are to be
issued upon the exercise of a warrant (the "Warrant"). The foregoing assumes
exercise in full of the over-allotment option described in the Registration
Statement. The Company Shares, the Outstanding Shares and the Warrant Shares are
to be sold pursuant to an underwriting agreement (the "Underwriting Agreement")
to be entered into among the Company, the holders of the Outstanding Shares and
the Warrant, and Cowen & Company, Montgomery Securities and Prudential
Securities Incorporated, as representatives of the several underwriters.

   We are familiar with the Company's Certificate of Incorporation and all
amendments thereto, its By-Laws and all amendments thereto, records of meetings
and consents of its Board of Directors and stockholders, and its stock records.
We have examined such other records and documents as we deemed necessary or
appropriate for purposes of rendering this opinion.

   Based upon the foregoing, we are of the opinion that:

   1. The Company Shares have been duly authorized and, when certificates for
the Company Shares have been duly executed and countersigned and delivered in
accordance with the Underwriting Agreement, the Company Shares will be validly
issued, fully paid and non-assessable.

   2. The Outstanding Shares have been duly authorized and are validly issued,
fully paid and non-assessable.

   3. The Warrant Shares have been duly authorized and, when the Warrant has
been exercised in accordance with its terms and a certificate for the Warrant
Shares has been duly executed, countersigned and delivered, the Warrant Shares
will be validly issued, fully paid and non-assessable.
<PAGE>
 
   We consent to the filing of this opinion as an exhibit to the Registration
Statement and to the reference to us under the heading "Legal Matters" in the
prospectus forming part of the Registration Statement.

                                  Very truly yours,

                                  FOLEY, HOAG & ELIOT LLP



                                  By  /s/ Mark L. Johnson
                                    ----------------------------------
                                     A Partner

<PAGE>
 
                                                                    Exhibit 10.1
 
                         REGISTRATION RIGHTS AGREEMENT

                                February 11, 1991


To each of the several Purchasers
(the "Purchasers") named in Schedule
I to the Series A Convertible
Preferred Stock Purchase Agreement of
even date herewith and to BEB Limited
Partnership I and BEB Limited Partnership II

Gentlemen:

     This will confirm that in consideration of the Purchasers' agreement on the
date hereof to purchase an aggregate of 630,516 shares (the "Preferred Shares")
of Series A Convertible Preferred Stock, $.01 par value ("Preferred Stock"), of
Credit Technologies, Inc., a Delaware corporation (the "Company"), pursuant to
the Series A Convertible Preferred Stock Purchase Agreement of even date
herewith (the "Purchase Agreement") between the Company and the Purchasers and
as an inducement to the Purchasers to consummate the transactions contemplated
by the Purchase Agreement, the Company covenants and agrees with each of the
Purchasers, BEB Limited Partnership I and BEB Limited Partnership II as follows:

     1.   Certain Definitions.  As used in this Agreement, the following terms
          -------------------                                                 
shall have the following respective meanings:

     "Commission" shall mean the Securities and Exchange Commission, or any
      ----------                                                           
other federal agency at the time administering the Securities Act.

          "Common Stock"  shall mean the Common Stock, $.01 par value, of the
           ------------                                                      
     Company, as constituted as of the date of this Agreement.

          "Conversion Shares" shall mean shares of Common Stock issued upon
           -----------------                                               
     conversion of the Preferred Shares.

          "Exchange Act" shall mean the Securities Exchange Act of 1934, as
           ------------                                                    
     amended, 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.

          "Registration Expenses" shall mean the expenses so described in
           ---------------------                                         
     Section 8.

          "Restricted Stock" shall mean (i) the 733,333 shares of Common Stock
           ----------------                                                   
     held by BEB Limited Partnership I on the date hereof, (ii) the 244,444
     shares of Common Stock held by BEB Limited Partnership II on the date
     hereof and (iii) the Conversion Shares, excluding, in each case, Common
     Stock and
<PAGE>
 
     Conversion Shares which have been (a) registered under the Securities Act
     pursuant to an effective registration statement filed thereunder and
     disposed of in accordance with the registration statement covering them or
     (b) publicly sold pursuant to Rule 144 under the Securities Act.

          "Securities Act" shall mean the Securities Act of 1933, as amended, 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.

          "Selling Expenses" shall mean the expenses so described in Section 8.
           ----------------                                                    

     2.     Restrictive Legend.  Each certificate representing Preferred Shares
            ------------------                                                 
or Restricted Stock shall, except as otherwise provided in this Section 2 or in
Section 3, be stamped or otherwise imprinted with a legend substantially in the
following form:

          "THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
          1933 AND MAY NOT BE TRANSFERRED OR OTHERWISE DISPOSED OF UNLESS IT HAS
          BEEN REGISTERED UNDER THAT ACT OR AN EXEMPTION FROM REGISTRATION IS
          AVAILABLE."

A certificate shall not bear such legend if in the opinion of counsel
satisfactory to the Company (it being agreed that Testa, Hurwitz & Thibeault
shall be satisfactory) the securities being sold thereby may be publicly sold
without registration under the Securities Act.

     3.   Notice of Proposed Transfer.  Prior to any proposed transfer of any
          ---------------------------                                        
Preferred Shares or Restricted Stock (other than under the circumstances
described in Sections 4, 5 or 6), the holder thereof shall give written notice
to the Company of its intention to effect such transfer.  Each such notice shall
describe the manner of the proposed transfer and, if requested by the Company,
shall be accompanied by an opinion of counsel satisfactory to the Company (it
being agreed that Testa, Hurwitz & Thibeault shall be satisfactory) to the
effect that the proposed transfer may be effected without registration under the
Securities Act, whereupon the holder of such stock shall be entitled to transfer
such stock in accordance with the terms of its notice; provided, however, that
                                                       -----------------      
no such opinion of counsel shall be required for a transfer to one or more
partners of the transferor (in the case of a transferor that is a partnership)
or to an affiliated corporation (in the case of a transferor that is a
corporation).  Each certificate for Preferred Shares or Restricted Stock
transferred as above provided shall bear the legend set forth in Section 2,
except that such certificate shall not bear such legend if (i) such transfer is
in accordance with



                                      -2-
<PAGE>
 
the provisions of Rule 144 (or any other rule permitting public sale without
registration under the Securities Act) or (ii) the opinion of counsel referred
to above is to the further effect that the transferee and any subsequent
transferee (other than an affiliate of the Company) would be entitled to
transfer such securities in a public sale without registration under the
Securities Act.  The restrictions provided for in this Section 3 shall not apply
to securities which are not required to bear the legend prescribed by Section 2
in accordance with the provisions of that Section.

     4.   Required Registration. (a) At any time after the earlier of (i) six
          ---------------------                                              
months after any registration statement covering a public offering of securities
of the Company under the Securities Act shall have become effective, and (ii)
the fifth anniversary of the date of this Agreement, the holders of Restricted
Stock constituting at least 40% of the total shares of Restricted Stock then
outstanding may request the Company to register under the Securities Act all or
any portion of the shares of Restricted Stock held by such requesting holder or
holders for sale in the manner specified in such notice, provided that the
                                                         --------
shares of Restricted Stock for which registration has been requested shall
constitute at least 20% of the total shares of Restricted Stock originally
issued (as adjusted as may be required from time to time by Section 10 hereof)
if such holder or holders shall request the registration of less than all shares
of Restricted Stock then held by such holder or holders (or any lesser
percentage if the reasonably anticipated aggregate price to the public of such
public offering would exceed $2,000,000).  For purposes of this Section 4 and
Sections 5, 6, 13(a) and 13(d), the term "Restricted Stock" shall be deemed to
include, without limiting the definition of such term as set forth in Section 1
hereof, the number of shares of Restricted Stock which would be issuable to a
holder of Preferred Shares upon conversion of all shares of Preferred Stock held
by such holder at such time, provided, however, that the only securities which
                             -----------------                                
the Company shall be required to register pursuant hereto shall be shares of
Common Stock, and provided, further, however, that, in any underwritten public
                  --------  -------  -------
offering contemplated by this Section 4 or Sections 5 and 6, the holders of
Preferred Shares shall be entitled to sell such Preferred Shares to the
underwriters for conversion and sale of the shares of Common Stock issued upon
conversion thereof.  Notwithstanding anything to the contrary contained herein,
no request may be made under this Section 4 within 120 days after the effective
date of a registration statement filed by the Company covering a firm commitment
underwritten public offering in which the holders of Restricted Stock shall have
been entitled to join pursuant to Sections 5 or 6 and in which there shall have
been effectively registered all shares of Restricted Stock as to which
registration shall have been requested.



                                      -3-
<PAGE>
 
          (b) Following receipt of any notice under this Section 4, the Company
shall immediately notify all holders of Restricted Stock from whom notice has
not been received and shall use its best efforts to register under the
Securities Act, for public sale in accordance with the method of disposition
specified in such notice from requesting holders, the number of shares of
Restricted Stock specified in such notice (and in all notices received by the
Company from other holders within 30 days after the giving of such notice by the
Company).  If such method of disposition shall be an underwritten public
offering, the holders of a majority of the shares of Restricted Stock to be sold
in such offering may designate the managing underwriter of such offering,
subject to the approval of the Company, which approval shall not be unreasonably
withheld or delayed.  The Company shall be obligated to register Restricted
Stock pursuant to this Section 4 on two occasions only, provided, however, that
                                                        --------  -------
such obligation shall be deemed satisfied only when a registration statement
covering all shares of Restricted Stock specified in notices received as
aforesaid, for sale in accordance with the method of disposition specified by
the requesting holders, shall have become effective and, if such method of
disposition is a firm commitment underwritten public offering, all such shares
shall have been sold pursuant thereto.

          (c) The Company shall be entitled to include in any registration
statement referred to in this Section 4, for sale in accordance with the method
of disposition specified by the requesting holders, shares of Common Stock to be
sold by the Company for its own account, except as and to the extent that, in
the opinion of the managing underwriter (if such method of disposition shall be
an underwritten public offering), such inclusion would adversely affect the
marketing of the Restricted Stock to be sold.  Except for registration
statements on Form S-4, S-8 or any successor thereto, the Company will not file
with the Commission any other registration statement with respect to its Common
Stock, whether for its own account or that of other stockholders, from the date
of receipt of a notice from requesting holders pursuant to this Section 4 until
the completion of the period of distribution of the registration contemplated
thereby.

     5.     Incidental Registration.  If the Company at any time (other than
            -----------------------                                         
pursuant to Section 4 or Section 6) proposes to register any of its securities
under the Securities Act for sale to the public, whether for its own account or
for the account of other security holders or both (except with respect to
registration statements on Forms S-4, S-8 or another form not available for
registering the Restricted Stock for sale to the public), each such time it will
give written notice to all holders of outstanding Restricted Stock of its
intention so to do.  Upon the written request of any such holder, received by
the Company within 30 days after the giving of any such notice by the



                                      -4-
<PAGE>
 
Company, to register any of its Restricted Stock (which request shall state the
intended method of disposition thereof), the Company will use its best efforts
to cause the Restricted Stock as to which registration shall have been so
requested to be included in the securities to be covered by the registration
statement proposed to be filed by the Company, all to the extent requisite to
permit the sale or other disposition by the holder (in accordance with its
written request) of such Restricted Stock so registered.  In the event that any
registration pursuant to this Section 5 shall be, in whole or in part, an
underwritten public offering of Common Stock, the number of shares of Restricted
Stock to be included in such an underwriting may be reduced (pro rata among the
requesting holders based upon the number of shares of Restricted Stock owned by
such holders) if and to the extent that the managing underwriter shall be of the
opinion that such inclusion would adversely affect the marketing of the
securities to be sold by the Company therein, provided, however, that such
                                              --------  -------
number of shares of Restricted Stock shall not be reduced if any shares are to
be included in such underwriting for the account of any person other than the
Company or requesting holders of Restricted Stock, and provided, further,
                                                       --------  ------- 
however, that in no event may less than one-third of the total number of shares
- -------                                                                        
of Common Stock to be included in such underwriting be made available for shares
of Restricted Stock.  Notwithstanding the foregoing provisions, the Company may
withdraw any registration statement referred to in this Section 5 without
thereby incurring any liability to the holders of Restricted Stock.

     6.   Registration on Form S-3.  If at any time (i) a holder or holders of
          ------------------------                                            
Preferred Shares or Restricted Stock request that the Company file a
registration statement on Form S-3 or any successor thereto for a public
offering of all or any portion of the shares of Restricted Stock held by such
requesting holder or holders, the reasonably anticipated aggregate price to the
public of which would exceed $500,000, and (ii) the Company is a registrant
entitled to use Form S-3 or any successor thereto to register such shares, then
the Company shall use its best efforts to register under the Securities Act on
Form S-3 or any successor thereto, for public sale in accordance with the method
of disposition specified in such notice, the number of shares of Restricted
Stock specified in such notice. Whenever the Company is required by this Section
6 to use its best efforts to effect the registration of Restricted Stock, each
of the procedures and requirements of Section 4 (including but not limited to
the requirement that the Company notify all holders of Restricted Stock from
whom notice has not been received and provide them with the opportunity to
participate in the offering) shall apply to such registration, provided,
                                                               --------
however, that there shall be no limitation on the number of registrations on
- -------                                             
Form S-3 which may be requested and obtained under this Section 6, and
provided, further, however, that the requirements contained in the first
- --------  -------  -------


                                      -5-
<PAGE>
 
sentence of Section 4(a) shall not apply to any registration on Form S-3 which
may be requested and obtained under this Section 6.

     7.   Registration Procedures.  If and whenever the Company is required by
          -----------------------
the provisions of Sections 4, 5 or 6 to use its best efforts to effect the
registration of any shares of Restricted Stock under the Securities Act, the
Company will promptly:

          (a) prepare and file with the Commission a registration statement
(which, in the case of an underwritten public offering pursuant to Section 4,
shall be on Form S-1 or other form of general applicability satisfactory to the
managing underwriter selected as therein provided) with respect to such
securities and use its best efforts to cause such registration statement to
become and remain effective for the period of the distribution contemplated
thereby (determined as hereinafter provided);

          (b) prepare and file with the Commission such amendments and
supplements to such registration statement and the prospectus used in connection
therewith as may be necessary to keep such registration statement effective for
the period specified in paragraph (a) above and comply with the provisions of
the Securities Act with respect to the disposition of all Restricted Stock
covered by such registration statement in accordance with the sellers' intended
method of disposition set forth in such registration statement for such period;

          (c) furnish to each seller of Restricted Stock and to each underwriter
such number of copies of the registration statement and the prospectus included
therein (including each preliminary prospectus) as such persons reasonably may
request in order to facilitate the public sale or other disposition of the
Restricted Stock covered by such registration statement;

          (d) use its best efforts to register or qualify the Restricted Stock
covered by such registration statement under the securities or "blue sky" laws
of such jurisdictions as the sellers of Restricted Stock or, in the case of an
underwritten public offering, the managing underwriter reasonably shall request,
                                                                                
provided, however, that the Company shall not for any such purpose be required
- -----------------                                                             
to qualify generally to transact business as a foreign corporation in any
jurisdiction where it is not so qualified or to consent to general service of
process in any such jurisdiction;

          (e) use its best efforts to list the Restricted Stock covered by such
registration statement with any securities exchange, if any, on which the Common
Stock of the Company is then listed;



                                      -6-
<PAGE>
 
          (f) immediately notify each seller of Restricted Stock and each
underwriter under such registration statement, at any time when a prospectus
relating thereto is required to be delivered under the Securities Act, of the
happening of any event of which the Company has knowledge as a result of which
the prospectus contained in such registration statement, as then in effect,
includes an untrue statement of a material fact or omits to state a material
fact required to be stated therein or necessary to make the statements therein
not misleading in light of the circumstances then existing;

          (g) if the offering is underwritten and at the request of any seller
of Restricted Stock, use its best efforts to furnish on the date that Restricted
Stock is delivered to the underwriters for sale pursuant to such registration:
(i) an opinion dated such date of counsel representing the Company for the
purposes of such registration, addressed to the underwriters and to such seller,
stating that such registration statement has become effective under the
Securities Act and that (A) to the best knowledge of such counsel, no stop order
suspending the effectiveness thereof has been issued and no proceedings for that
purpose have been instituted or are pending or contemplated under the Securities
Act, (B) the registration statement, the related prospectus and each amendment
or supplement thereof comply as to form in all material respects with the
requirements of the Securities Act (except that such counsel need not express
any opinion as to financial statements contained therein) and (C) to such other
effects as reasonably may be requested by counsel for the underwriters or by
such seller or its counsel and (ii) a letter dated such date from the
independent public accountants retained by the Company, addressed to the
underwriters and to such seller, stating that they are independent public
accountants within the meaning of the Securities Act and that, in the opinion of
such accountants, the financial statements of the Company included in the
registration statement or the prospectus, or any amendment or supplement
thereof, comply as to form in all material respects with the applicable
accounting requirements of the Securities Act, and such letter shall
additionally cover such other financial matters (including information as to the
period ending no more than five business days prior to the date of such letter)
with respect to such registration as such underwriters reasonably may request;
and

          (h) make available for inspection by each seller of Restricted Stock,
any underwriter participating in any distribution pursuant to such registration
statement, and any attorney, accountant or other agent retained by such seller
or underwriter, all financial and other records, pertinent corporate documents
and properties of the Company, and cause the Company's officers, directors and
employees to supply all information reasonably requested by any such seller,
underwriter, attorney,



                                      -7-
<PAGE>
 
accountant or agent in connection with such registration statement.

     For purposes of Section 7(a) and 7(b) and of Section 4(c), the period of
distribution of Restricted Stock in a firm commitment underwritten public
offering shall be deemed to extend until each underwriter has completed the
distribution of all securities purchased by it, and the period of distribution
of Restricted Stock in any other registration shall be deemed to extend until
the earlier of the sale of all Restricted Stock covered thereby and 120 days
after the effective date thereof.

     In connection with each registration hereunder, the sellers of Restricted
Stock will furnish to the Company in writing such information with respect to
themselves and the proposed distribution by them as reasonably shall be
necessary in order to assure compliance with federal and applicable state
securities laws.

     In connection with each registration pursuant to Sections 4, 5 or 6
covering an underwritten public offering, the Company and each seller agree to
enter into a written agreement with the managing underwriter selected in the
manner herein provided in such form and containing such provisions as are
customary in the securities business for such an arrangement between such
underwriter and companies of the Company's size and investment stature.

     8.     Expenses. All expenses incurred by the Company in complying with
            --------
Sections 4, 5 and 6, including, without limitation, all registration and filing
fees, printing expenses, fees and disbursements of counsel and independent
public accountants for the Company, fees and expenses (including counsel fees)
incurred in connection with complying with state securities or "blue sky" laws,
fees of the National Association of Securities Dealers, Inc., transfer taxes,
fees of transfer agents and registrars, costs of insurance and fees and
disbursements of one counsel for the sellers of Restricted Stock, but excluding
any Selling Expenses, are called "Registration Expenses".  All underwriting
discounts and selling commissions applicable to the sale of Restricted Stock are
called "Selling Expenses".

     Except as may otherwise be required by various blue sky laws, the Company
will pay all Registration Expenses in connection with each registration
statement under Sections 4, 5 or 6. All Selling Expenses in connection with each
registration statement under Sections 4, 5 or 6 shall be borne by the
participating sellers in proportion to the number of shares sold by each, or by
such participating sellers other than the Company (except to the extent the
Company shall be a seller) as they may agree.



                                      -8-
<PAGE>
 
     9.   Indemnification and Contribution. (a)  In the event of a registration
          --------------------------------
of any of the Restricted Stock under the Securities Act pursuant to Sections 4,
5 or 6, the Company will indemnify and hold harmless each seller of such
Restricted Stock thereunder, each underwriter of such Restricted Stock
thereunder and each other person, if any, who controls such seller or
underwriter within the meaning of the Securities Act, against any losses,
claims, damages or liabilities, joint or several, to which such seller,
underwriter or controlling person may become subject under the Securities Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions in
respect thereof) arise out of or are based upon any untrue statement or alleged
untrue statement of any material fact contained in any registration statement
under which such Restricted Stock was registered under the Securities Act
pursuant to Sections 4, 5 or 6, any preliminary prospectus or final prospectus
contained therein, or any amendment or supplement thereof, or arise out of or
are based upon the omission or alleged omission to state therein 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, and will
reimburse each such seller, each such underwriter and each such controlling
person for any legal or other expenses reasonably incurred by them in connection
with investigating or defending any such loss, claim, damage, liability or
action, provided, however, that the Company will not be liable in any such case
        --------  -------
if and to the extent that any such loss, claim,, damage or liability arises out
of or is based upon an untrue statement or alleged untrue statement or omission
or alleged omission so made in conformity with information furnished by any such
seller, any such underwriter or any such controlling person in writing
specifically for use in such registration statement or prospectus.

          (b) In the event of a registration of any of the Restricted Stock
under the Securities Act pursuant to Sections 4, 5 or 6, each seller of such
Restricted Stock thereunder, severally and not jointly, will indemnify and hold
harmless the Company, each person, if any, who controls the Company within the
meaning of the Securities Act, each officer of the Company who signs the
registration statement, each director of the Company, each underwriter and each
person who controls any underwriter within the meaning of the Securities Act,
against all losses, claims, damages or liabilities, joint or several, to which
the Company or such officer, director, underwriter or controlling person may
become subject under the Securities Act or otherwise, insofar as such losses,
claims, damages or liabilities (or actions in respect thereof) arise out of or
are based upon any untrue statement or alleged untrue statement of any material
fact contained in the registration statement under which such Restricted Stock
was registered under the Securities Act pursuant to Sections 4, 5 or 6, any
preliminary prospectus or final



                                      -9-
<PAGE>
 
prospectus contained therein, or any amendment or supplement thereof, or arise
out of or are based upon the omission or alleged omission to state therein 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,
and will reimburse the Company and each such officer, director, underwriter and
controlling person for any legal or other expenses reasonably incurred by them
in connection with investigating or defending any such loss, claim, damage,
liability or action, provided however, that such seller will be liable hereunder
                     -------- -------                                           
in any such case if and only to the extent that any such loss, claim, damage or
liability arises out of or is based upon an untrue statement or alleged untrue
statement or omission or alleged omission made in reliance upon and in
conformity with information pertaining to such seller, as such, furnished in
writing to the Company by such seller specifically for use in such registration
statement or prospectus, and provided, further, however, that the liability of
                             --------  -------  -------
each seller hereunder shall be limited to the proportion of any such loss,
claim, damage, liability or expense which is equal to the proportion that the
public offering price of the shares sold by such seller under such registration
statement bears to the total public offering price of all securities sold
thereunder, but not in any event to exceed the proceeds received by such seller
from the sale of Restricted Stock covered by such registration statement.

          (c) Promptly after receipt by an indemnified party hereunder of notice
of the commencement of any action, such indemnified party shall, if a claim in
respect thereof is to be made against the indemnifying party hereunder, notify
the indemnifying party in writing thereof, but the omission so to notify the
indemnifying party shall not relieve it from any liability which it may have to
such indemnified party other than under this Section 9 and shall only relieve it
from any liability which it may have to such indemnified party under this
Section 9 if and to the extent the indemnifying party is prejudiced by such
omission.  In case any such action shall be brought against any indemnified
party and it shall notify the indemnifying party of the commencement thereof,
the indemnifying party shall be entitled to participate in and, to the extent it
shall wish, to assume and undertake the defense thereof with counsel
satisfactory to such indemnified party, and, after notice from the indemnifying
party to such indemnified party of its election so to assume and undertake the
defense thereof, the indemnifying party shall not be liable to such indemnified
party under this Section 9 for any legal expenses subsequently incurred by such
indemnified party in connection with the defense thereof other than reasonable
costs of investigation and of liaison with counsel so selected, provided,
                                                                --------
however, that, if the defendants in any such action include both the indemnified
- -------
party and the indemnifying party and the indemnified party shall have



                                     -10-
<PAGE>
 
reasonably concluded that there may be reasonable defenses available to it which
are different from or in addition to those available to the indemnifying party
or if the interests of the indemnified party reasonably may be deemed to
conflict with the interests of the indemnifying party, the indemnified party
shall have the right to select a single separate counsel and to assume such
legal defenses and otherwise to participate in the defense of such action, with
the expenses and fees of such separate counsel and other reasonable expenses
related to such participation to be reimbursed by the indemnifying party as
incurred.

          (d) In order to provide for just and equitable contribution to joint
liability under the Securities Act in any case in which either (i) any holder of
Restricted Stock exercising rights under this Agreement, or any controlling
person of any such holder, makes a claim for indemnification pursuant to this
Section 9 but it is judicially determined (by the entry of a final judgment or
decree by a court of competent jurisdiction and the expiration of time to appeal
or the denial of the last right of appeal) that such indemnification may not be
enforced in such case notwithstanding the fact that this Section 9 provides for
indemnification in such case, or (ii) contribution under the Securities Act may
be required on the part of any such selling holder or any such controlling
person in circumstances for which indemnification is provided under this Section
9; then, and in each such case, the Company and such holder will contribute to
the aggregate losses, claims, damages or liabilities to which they may be
subject (after contribution from others) in such proportion so that such holder
is responsible for the portion represented by the percentage that the public
offering price of its Restricted Stock offered by the registration statement
bears to the public offering price of all securities offered by such
registration statement, and the Company is responsible for the remaining
portion; provided, however, that, in any such case, (A) no such holder will be
         --------  -------
require to contribute any amount in excess of the public offering price of all
such Restricted Stock offered by it pursuant to such registration statement; and
(B) no person or entity guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Securities Act) will be entitled to contribution
from any person or entity who was not guilty of such fraudulent
misrepresentation.

     10.    Changes in Common Stock or Preferred Stock.  If, and as often as,
            ------------------------------------------                       
there is any change in the Common Stock or the Preferred Stock by way of a stock
split, stock dividend, combination or reclassification, or through a merger,
consolidation, reorganization or recapitalization, or by any other means,
appropriate adjustment shall be made in the provisions hereof so that the rights
and privileges granted hereby shall continue with respect to the Common Stock or
the Preferred Stock as so changed.




                                     -11-
<PAGE>
 
     11.  Rule 144 Reporting.  With a view to making available the benefits of
          ------------------                                                  
certain rules and regulations of the Commission which may at any time permit the
sale of the Restricted Stock to the public without registration, at all times
after 90 days after any registration statement covering a public offering of
securities of the Company under the Securities Act shall have become effective,
the Company agrees to:

          (a) make and keep public information available, as those terms are
understood and defined in Rule 144 under the Securities Act;

          (b) use its best efforts to file with the Commission in a timely
manner all reports and other documents required of the Company under the
Securities Act and the Exchange Act; and

          (c) furnish to each holder of Restricted Stock forthwith upon request
a written statement by the Company as to its compliance with the reporting
requirements of such Rule 144 and of the Securities Act and the Exchange Act, a
copy of the most recent annual or quarterly report of the Company, and such
other reports and documents so filed by the Company as such holder may
reasonably request in availing itself of any rule or regulation of the
Commission allowing such holder to sell any Restricted Stock without
registration.

    12.   Representations and Warranties of the Company.  The
          ---------------------------------------------      
Company represents and warrants to you as follows:

          (a) The execution, delivery and performance of this Agreement by the
Company have been duly authorized by all requisite corporate action and will not
violate any provision of law, any order of any court or other agency of
government, the Charter or By-laws of the Company or any provision of any
indenture, agreement or other instrument to which it or any of its properties or
assets is bound, conflict with, result in a breach of or constitute (with due
notice or lapse of time or both) a default under any such indenture, agreement
or other instrument or result in the creation or imposition of any lien, charge
or encumbrance of any nature whatsoever upon any of the properties or assets of
the Company.

          (b) This Agreement has been duly executed and delivered by the Company
and constitutes the legal, valid and binding obligation of the Company,
enforceable in accordance with its terms.

     13.    Miscellaneous.
            ------------- 

          (a) All covenants and agreements contained in this Agreement by or on
behalf of any of the parties hereto shall bind and inure to the benefit of the
respective successors and assigns



                                     -12-
<PAGE>
 
of the parties hereto (including without limitation transferees of any Preferred
Shares or Restricted Stock), whether so expressed or not, provided, however that
                                                          --------  -------
registration rights conferred herein on the holders of Preferred Shares or
Restricted Stock shall only inure to the benefit of a transferee of Preferred
Shares or Restricted Stock if (i) there is transferred to such transferee at
least 20% of the total shares of Restricted Stock originally issued (as adjusted
as may be required from time to time by Section 10 hereof) pursuant to the
Purchase Agreement to the direct or indirect transferor of such transferee or
(ii) such transferee is a partner, shareholder or affiliate of a party hereto.

          (b) All notices, requests, consents and other communications hereunder
shall be in writing and shall be mailed by certified or registered mail, return
receipt requested, postage prepaid, or telexed or telecopied, in the case of
non-U.S. residents, addressed as follows:

          if to the Company or any other party hereto, at the address of such
     party set forth in the Purchase Agreement;

          if to any subsequent holder of Preferred Shares or Restricted Stock,
     to it at such address as may have been furnished to the Company in writing
     by such holder;

or, in any case, at such other address or addresses as shall have been furnished
in writing to the Company (in the case of a holder of Preferred Shares or
Restricted Stock) or to the holders of Preferred Shares or Restricted Stock (in
the case of the Company) in accordance with the provisions of this paragraph.

          (c) This Agreement shall be governed by and construed in accordance
with the laws of the Commonwealth of Massachusetts.

          (d) This Agreement may not be amended or modified, and no provision
hereof may be waived, without the written consent of the Company and the holders
of at least two-thirds of the outstanding shares of Restricted Stock.

          (e) This Agreement may be executed in two or more counterparts, each
of which shall be deemed an original, but all of which together shall constitute
one and the same instrument.

          (f) The obligations of the Company to register shares of Restricted
Stock under Sections 4, 5 or 6 shall terminate twelve and one-half years from
the date of this Agreement.

          (g) If requested in writing by the underwriters for the initial
underwritten public offering of securities of the Company, each holder of
Restricted Stock who is a party to this Agreement shall agree not to sell
publicly any shares of



                                     -13-
<PAGE>
 
Restricted Stock or any other shares of Common Stock (other than shares of
Restricted Stock or other shares of Common Stock being registered in such
offering), without the consent of such underwriters, for a period of not more
than 90 days following the effective date of the registration statement relating
to such offering; provided, however, that all persons entitled to registration
                  --------  -------                                           
rights with respect to shares of Common Stock who are not parties to this
Agreement, all other persons selling shares of Common Stock in such offering and
all executive officers and directors of the Company shall also have agreed not
to sell publicly their Common Stock under the circumstances and pursuant to the
terms set forth in this Section 13(g).

          (h) Notwithstanding the provisions of Section 7(a), the Company's
obligation to file a registration statement, or cause such registration
statement to become and remain effective, shall be suspended for a period not to
exceed 90 days in any 24-month period if there exists at the time material non-
public information relating to the Company which, in the reasonable opinion of
the Company, should not be disclosed.

          (i) The Company shall not grant to any third party any registration
rights more favorable than any of those contained herein without the written
consent of the holders of at least ninety percent (90%) of the outstanding
shares of Restricted Stock, so long as any of the registration rights under this
Agreement remains in effect.

          (j) If any provision of this Agreement shall be held to be illegal,
invalid or unenforceable, such illegality, invalidity or unenforceability shall
attach only to such provision and shall not in any manner affect or render
illegal, invalid or unenforceable any other provision of this Agreement, and
this Agreement shall be carried out as if any such illegal, invalid or
unenforceable provision were not contained herein.

     Please indicate your acceptance of the foregoing by signing and returning
the enclosed counterpart of this letter, whereupon this Agreement shall be a
binding agreement between the Company and you.

                         Very truly yours,

                         CREDIT TECHNOLOGIES, INC.


                         By: /s/ Pamela D.A. Reeve
                            -------------------------------------
                              Pamela D.A. Reeve, President

AGREED TO AND ACCEPTED as of the
date first above written.



                                     -14-
<PAGE>
 
MASSACHUSETTS CAPITAL RESOURCE COMPANY


By: /s/ Joan C. McArdle
   ------------------------------------
    Joan C. McArdle, Vice President

BEB LIMITED PARTNERSHIP IV

By: Entrepreneurial, Inc., its General Partner


By: /s/ Torrence C. Harder
   ------------------------------------
    Torrence C. Harder,  President

BEB LIMITED PARTNERSHIP I

By: BEB, Inc., its General Partner


By: /s/ Torrence C. Harder
   ------------------------------------
    Torrence C.  Harder,  President

BEB LIMITED PARTNERSHIP II

By: BEB, Inc., its General Partner


By: /s/ Torrence C. Harder
   ------------------------------------
    Torrence C.  Harder,  President



                                     -15-
<PAGE>
 
                                AMENDMENT NO. 1
                                       TO
                         REGISTRATION RIGHTS AGREEMENT

     Agreement made as of this 19th day of December 1991 by and among Credit
Technologies, Inc., a Delaware corporation (the "Company") and the persons whose
names and signatures are set forth below.

     WHEREAS, the Company has entered into a certain Registration Rights
Agreement, dated as of February 11, 1991 (the "Registration Rights Agreement"),
with BEB Limited Partnership I, BEB Limited Partnership II and certain
purchasers of its Series A Convertible Preferred Stock; and

     WHEREAS, the Company has agreed to issue and sell an aggregate of 620,000
shares of the Company's Series B Convertible Preferred Stock pursuant to a
certain Series B Convertible Preferred Stock Purchase Agreement, dated the date
hereof, and to grant the purchasers thereunder (the "New Purchasers") certain
registration rights; and

     NOW THEREFORE, in consideration of the foregoing and other good and
valuable consideration, the receipt of which is hereby acknowledged, the parties
hereto do hereby agree with each other as follows:

     1.   The Registration Rights Agreement is hereby amended by deleting
therefrom the words "(the 'Preferred Shares')" in the first paragraph of the
Registration Rights Agreement.

     2.   The Registration Rights Agreement is hereby amended by inserting in
Section 1 thereof the following definitions:

          "Preferred Shares" shall mean those shares of the Company's: (i)
Series A Convertible Preferred Stock issued and sold pursuant to a certain
Series A Convertible Preferred Stock Purchase Agreement, dated as of February
11, 1991, by and among the Company and the Purchasers named in Schedule I
thereto, and (ii) Series B Convertible Preferred Stock issued and sold pursuant
to a certain Series B Convertible Preferred Stock Purchase Agreement, dated as
of December 19, 1991, by and among the Company and the Purchasers named in
Schedule I thereto.

     3.   Each of the New Purchasers is hereby made a party to the Registration
Rights Agreement as a "Purchaser" thereunder and the New Purchasers shall be
subject to and entitled to all of the rights and benefits contained in the
Registration Rights Agreement.

     4.   The Registration Rights Agreement, as herein amended, is hereby
ratified and confirmed.



                                     -16-
<PAGE>
 
     5.   This Agreement shall be governed by, and construed in accordance with,
the laws of the Commonwealth of Massachusetts.

     6.   This Agreement shall be binding upon and inure to the benefit of the
parties hereto and their respective successors and assigns, legal
representatives and heirs.

     7.   This Agreement may be executed in one or more counterparts, each of
which shall be deemed to be an original, but all of which taken together shall
together constitute one and the same instrument.

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement on the
day, month and year first above written.

                         CREDIT TECHNOLOGIES, INC.


                         By: /s/ Pamela D.A. Reeve
                            ---------------------------------
                             Pamela D.A. Reeve, President

                         MASSACHUSETTS CAPITAL RESOURCE COMPANY


                         By: /s/ Joan C. McArdle
                            ---------------------------------                
                             Joan C. McArdle, Vice President


                         BEB LIMITED PARTNERSHIP IV

                         By:  Entrepreneurial, Inc., its General Partner


                         By: /s/ Torrence C. Harder
                            ---------------------------------
                             Torrence C. Harder,  President

                         BEB LIMITED PARTNERSHIP I

                         By:  BEB, Inc., its General Partner


                         By: /s/ Torrence C. Harder
                            ---------------------------------
                             Torrence C.  Harder,  President

                         BEB LIMITED PARTNERSHIP II

                         By: BEB, Inc., its General Partner


                         By: /s/ Torrence C. Harder
                            ---------------------------------
                             Torrence C.  Harder,  President


                         D. QUINN MILLS, INC. PENSION PLAN


                         By: /s/ D. Quinn Mills
                            ---------------------------------


                                     -17-
<PAGE>
 
                              D. Quinn Mills, Administrator

                         D. QUINN MILLS, INC. PROFIT SHARING
                              PLAN

                         By:  /s/ D. Quinn Mills
                            ------------------------------------
                              D. Quinn Mills, Administrator


                              /s/ Michael Adam Perfit
                         ---------------------------------------
                              Michael Adam Perfit

                         ARTICLE VII TRUST


                         By:  /s/ Randolph P. Barton
                            ------------------------------------
                              Randolph P. Barton, Trustee


                              /s/ J. Bryan Mims
                         ---------------------------------------
                              J. Bryan Mims


                              /s/ Susan Mims
                         ---------------------------------------
                              Susan Mims

                         ELIE RIVOLLIER, JR., ROLLOVER IRA

                         By:  /s/ Elie Rivollier, Jr.
                            ------------------------------------

                         STONMI REALTY TRUST

                         By:  /s/ Arthur J. Epstein
                            ------------------------------------
                              Arthur J. Epstein, Trustee

                         JOHN A. WHITTEMORE INSURANCE AGENCY,
                              INC.  PROFIT SHARING RETIREMENT
                              TRUST


                         By:  /s/ John A. Whittemore, Trustee
                            ------------------------------------
                              James A. Whittemore, Trustee

                              /s/ William P. Hood
                         ---------------------------------------
                              William P. Hood

                              /s/ J. Neil Benney
                         ---------------------------------------
                              J. Neil Benney

                              /s/ Jonathan M. Keyes
                         ---------------------------------------
                              Jonathan M. Keyes


                                     -18-
<PAGE>
 
                                AMENDMENT NO. 2
                                       TO
                         REGISTRATION RIGHTS AGREEMENT

     Agreement made as of this 9th day of June 1993 by and among Credit
Technologies, Inc., a Delaware corporation (the "Company") and the persons whose
names and signatures are set forth below.

     WHEREAS, the Company has entered into a certain Registration Rights
Agreement, dated as of February 11, 1991, with BEB Limited Partnership I, BEB
Limited Partnership II and certain purchasers of its Series A Convertible
Preferred Stock, as amended to include certain purchasers of its Series B
Convertible Preferred Stock by a certain Amendment No. 1 To Registration Rights
Agreement, dated as of December 19, 1991 (as so amended, the "Registration
Rights Agreement"); and

     WHEREAS, the Company has agreed to issue and sell an aggregate of up to
225,000 shares of the Company's Series C Convertible Preferred Stock pursuant to
a certain Series C Convertible Preferred Stock Purchase Agreement, dated the
date hereof, and to grant the purchasers thereunder (the "New Purchasers")
certain registration rights;

     NOW THEREFORE, in consideration of the foregoing and other good and
valuable consideration, the receipt of which is hereby acknowledged, the parties
hereto do hereby agree with each other as follows:

     1.  The Registration Rights Agreement is hereby amended by deleting
therefrom the definition of "Preferred Shares" in Section 1 thereof and
substituting therefor the following definition:

          "Preferred Shares" shall mean those shares of the Company's: (i)
Series A Convertible Preferred Stock issued and sold pursuant to a certain
Series A Convertible Preferred Stock Purchase Agreement, dated as of February
11, 1991, by and among the Company and the Purchasers named in Schedule I
thereto, (ii) Series B Convertible Preferred Stock issued and sold pursuant to a
certain Series B Convertible Preferred Stock Purchase Agreement, dated as of
December 19, 1991, by and among the Company and the Purchasers named in Schedule
I thereto and (iii) Series C Convertible Preferred Stock issued and sold
pursuant to a certain Series C Convertible Preferred Stock Purchase Agreement,
dated as of June 9, 1993, by and among the Company and the Purchasers named in
Schedule I thereto.

     2.   Each of the New Purchasers is hereby made a party to the Registration
Rights Agreement as a "Purchaser" thereunder and the New Purchasers shall be
subject to and entitled to all of the rights and benefits contained in the
Registration Rights Agreement.
<PAGE>
 
     3.  The Registration Rights Agreement, as herein amended, is hereby
ratified and confirmed.

     4.  This Agreement shall be governed by, and construed in accordance with,
the laws of the Commonwealth of Massachusetts.

     5.  This Agreement shall be binding upon and inure to the benefit of the
parties hereto and their respective successors and assigns, legal
representatives and heirs.

     6.  This Agreement may be executed in one or more counterparts, each of
which shall be deemed to be an original, but all of which taken together shall
together constitute one and the same instrument.

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement on the
day, month and year first above written.

                                CREDIT TECHNOLOGIES, INC.             
                                                                      
                                                                      
                                By:/s/ Pamela D.A. Reeve              
                                   ------------------------------------
                                     Pamela D.A. Reeve, President          
                                                                      
                                MASSACHUSETTS CAPITAL RESOURCE COMPANY
                                                                      
                                                                      
                                By:/s/ Joan C. McArdle                
                                   ------------------------------------
                                     Joan C. McArdle, Vice President        
                      
                      
                                BEB LIMITED PARTNERSHIP IV
                      
                                By:  Entrepreneurial, Inc., its General 
                                     Partner 
                      

                                By:/s/ Torrence C. Harder
                                   -------------------------------------
                                      Torrence C. Harder, President
                      
                                BEB LIMITED PARTNERSHIP I
                      
                                By:  BEB, Inc., its General Partner
                      
                      
                                By:/s/ Torrence C. Harder
                                   ------------------------------------
                                      Torrence C. Harder, President
                      
                                BEB LIMITED PARTNERSHIP II
                      
                                By: BEB, Inc., its General Partner
                      
                      
                                By:/s/ Torrence C. Harder
                                   ------------------------------------
<PAGE>
 
                                      Torrence C.  Harder,  President


                                D. QUINN MILLS, INC. PENSION PLAN     
                                                                      
                                                                      
                                By:/s/ D. Quinn Mills                 
                                   ------------------------------------
                                     D. Quinn Mills, Administrator    
                                                                      
                                D. QUINN MILLS, INC. PROFIT SHARING   
                                     PLAN                             
                                                                      
                                By:/s/ D. Quinn Mills                 
                                   ------------------------------------
                                     D. Quinn Mills, Administrator    
                                                                      
                                                                      
                                  /s/ Michael Adam Perfit             
                                 --------------------------------------
                                      Michael Adam Perfit              
                                                                      
                                ARTICLE VII TRUST                     
                                                                      
                                                                      
                                By:/s/ Randolph P. Barton             
                                   ------------------------------------
                                     Randolph P. Barton, Trustee      
                                                                      
                                                                      
                                /s/ J. Bryan Mims                     
                                ---------------------------------------
                                     J. Bryan Mims                    
                                                                      
                                                                      
                                /s/ Susan Mims                        
                                ---------------------------------------
                                     Susan Mims                       
                                                                      
                                ELIE RIVOLLIER, JR., ROLLOVER IRA     
                                                                      
                                By:/s/ Elie Rivollier, Jr.            
                                   -----------------------------------
                                                                      
                                                                      
                                STONMI REALTY TRUST                   
                                                                      
                                By:____________________________________
                                     Arthur J. Epstein, Trustee       
                                                                      
                                JOHN A. WHITTEMORE INSURANCE AGENCY,  
                                     INC. PROFIT SHARING RETIREMENT   
                                     TRUST                            
                                                                      
                                                                      
                                By:/s/ James A. Whittemore            
                                   ------------------------------------
                                     James A. Whittemore, Trustee     
                                                                      
                                /s/ William P. Hood                   
                                ---------------------------------------
                                     William P. Hood                   
<PAGE>
 
                                _______________________________________
                                     J. Neil Benney                        
                                                                      
                                _______________________________________
                                     Jonathan M. Keyes                      


                                PENSCO PENSION SERVICES, INC. F/B/O    
                                     MICHAEL A PERFIT, IRA             
                                                                       
                                                                       
                                By:/s/ Michael Adam Perfit             
                                   ------------------------------------
                                                                       
                                                                       
                                /s/ Lisa A. Mills                      
                                ---------------------------------------
                                     Lisa A. Mills                     
                                                                       
                                                                       
                                /s/ Joyce S. Mills                     
                                ---------------------------------------
                                     Joyce S. Mills                    
                                                                       
                                                                       
                                /s/ Deborah Mills Folk                 
                                ---------------------------------------
                                     Deborah Mills Folk                
                                                                       
                                                                       
                                /s/ William E. Northfield              
                                ---------------------------------------
                                     William E. Northfield             
                                                                       
                                /s/ John B. Pepper                     
                                ---------------------------------------
                                     John B. Pepper                    
                                                                       
                                                                       
                                /s/ Harold Howell                      
                                ---------------------------------------
                                     Harold Howell                     
                                                                       
                                                                       
                                /s/ Elie Rivollier, Jr.                
                                ---------------------------------------
                                     Elie Rivollier, Jr.               
                                                                       
                                                                       
                                /s/ Arthur J. Epstein                  
                                ---------------------------------------
                                     Arthur J. Epstein                  
<PAGE>
 
                                AMENDMENT NO. 3
                                       TO
                         REGISTRATION RIGHTS AGREEMENT

     Agreement made as of this 29th day of August 1994 by and among Credit
Technologies, Inc., a Delaware corporation (the "Company") and the persons whose
names and signatures are set forth below.

     WHEREAS, the Company has entered into a certain Registration Rights
Agreement, dated as of February 11, 1991, as amended to date, (the "Registration
Rights Agreement"), with BEB Limited Partnership I, BEB Limited Partnership II
and certain purchasers of its Series A, Series B and Series C Convertible
Preferred Stock; and

     WHEREAS, the Company has agreed to issue and sell its Subordinated Notes,
due June 30, 2001, in the original principal amount of $2,100,000, and Common
Stock Purchase Warrants for the purchase (subject to adjustment as provided
therein) of 262,500 shares of the Company's Common Stock pursuant to a certain
Subordinated Note and Warrant Purchase Agreement, dated the date hereof, and to
grant the purchasers thereunder (the "New Purchasers") certain registration
rights; and

     NOW THEREFORE, in consideration of the foregoing and other good and
valuable consideration, the receipt of which is hereby acknowledged, the parties
hereto do hereby agree with each other as follows:

     1.   The Registration Rights Agreement is hereby amended by deleting
therefrom the definition of "Conversion Shares" in Section 1 thereof and
substituting therefor the following definition:

          "`Conversion Shares' shall mean the shares of Common Stock issued upon
            -----------------                                                   
     conversion of the Preferred Shares and the Warrants."

     2.   The Registration Rights Agreement is hereby amended by adding to
Section 1 thereof the following definitions:

          "`1994 Purchase Agreement' shall mean that certain Subordinated Note
            -----------------------                                           
     and Warrant Purchase Agreement, dated on or about August 29, 1994, between
     the Company and the Persons listed in the Schedule of Purchasers attached
     thereto.

          `Warrants' shall mean those Common Stock Purchase Warrants issued and
           --------                                                            
     sold pursuant to a certain Subordinated Note and Warrant Purchase
     Agreement, dated as of August 29,
<PAGE>
 
     1994, by and between the Company and the Persons listed in the Schedule of
     Purchasers attached thereto.

     3.   The Registration Rights Agreement is hereby amended by deleting
therefrom the second sentence of Section 4 and substituting therefor the
following:

     "For purposes of this Section 4 and Sections 5, 6, 13(a) and 13(d), the
     term 'Restricted Stock' shall be deemed to include, without limiting the
     definition of such term as set forth in Section 1 hereof, the number of
     shares of Restricted Stock which would be issuable to a holder of Preferred
     Shares upon conversion of all shares of Preferred Stock held by such holder
     at such time and the number of shares of Restricted Stock which would be
     issuable to a holder of Warrants upon exercise of all Warrants held by such
     holder at such time; provided, however, that the only securities which the
                          --------  -------                                    
     Company shall be required to register pursuant hereto shall be shares of
     Common Stock, and provided, further, however, that, in any underwritten
                       --------  -------  -------                           
     public offering contemplated by this Section 4 or Sections 5 and 6, the
     holders of Preferred Shares shall be entitled to sell such Preferred Shares
     to the underwriters for conversion and sale of the shares of Common Stock
     issued upon conversion thereof and the holders of Warrants shall be
     entitled to sell such Warrants to the underwriters for exercise and sale of
     the shares of Common Stock issued upon exercise thereof."

     4.   The Registration Rights Agreement is hereby amended by deleting clause
(i) of the first sentence of Section 6 and substituting therefor the following:

     "(i) a holder or holders of Preferred Shares or Restricted Stock or
     Warrants request that the Company file a registration statement on Form S-3
     or any successor thereto for a public offering of all or any portion of the
     shares of Restricted Stock held by such requesting holder or holders, the
     reasonably anticipated aggregate price to the public of which would exceed
     $500,000, and"

     5.   The Registration Rights Agreement is hereby amended by deleting
clauses (a) and (b) of Section 13 and substituting therefor the following:

          "(a) All covenants and agreements contained in this Agreement by or on
     behalf of any of the parties hereto shall bind and inure to the benefit of
     the respective successors and assigns of the parties hereto (including
     without limitation transferees of any Preferred Shares or Restricted Stock
     or Warrants), whether so expressed or not, provided, however, that
                                                --------  -------      
     registration rights conferred herein on the holders of Preferred Shares or
     Restricted Stock or Warrants
<PAGE>
 
     shall only inure to the benefit of a transferee of Preferred Shares or
     Restricted Stock or Warrants if (i) there is transferred to such transferee
     at least 20% of the total shares of Restricted Stock originally issued (as
     adjusted as may be required from time to time by Section 10 hereof)
     pursuant to the Purchase Agreement or the 1994 Purchase Agreement, as the
     case may be, to the direct or indirect transferor of such transferee or
     (ii) such transferee is a partner, shareholder or affiliate of a party
     hereto.

          (b) All notices, requests, consents and other communications hereunder
     shall be in writing and shall be mailed by certified or registered mail,
     return receipt requested, postage prepaid, or telexed or telecopied, in the
     case of non-U.S. residents, addressed as follows:

          if to the Company or any other party to the Purchase Agreement or the
     1994 Purchase Agreement, at the address of such party set forth in the
     Purchase Agreement or the 1994 Purchase Agreement, as the case may be;

          if to any subsequent holder of Preferred Shares or Restricted Stock or
     Warrants, to it at such address as may have been furnished to the Company
     in writing by such holder;

     or, in any case, at such other address or addresses as shall have been
     furnished in writing to the Company (in the case of a holder of Preferred
     Shares or Restricted Stock or Warrants) or to the holders of Preferred
     Shares or Restricted Stock or Warrant (in the case of the Company) in
     accordance with the provisions of this paragraph."

     6.   The Registration Rights Agreement, as herein amended, is hereby
ratified and confirmed.

     7.   This Agreement shall be governed by, and construed in accordance with,
the laws of the Commonwealth of Massachusetts.

     8.   This Agreement shall be binding upon and inure to the benefit of the
parties hereto and their respective successors and assigns, legal
representatives and heirs.

     9.   This Agreement may be executed in one or more counterparts, each of
which shall be deemed to be an original, but all of which taken together shall
together constitute one and the same instrument.
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have executed this Agreement on the
day, month and year first above written.

                                CREDIT TECHNOLOGIES, INC.                      
                                                                               
                                                                               
                                By:/s/ Pamela D.A. Reeve                       
                                   ---------------------------------           
                                     Pamela D.A. Reeve, President              
                                                                               
                                MASSACHUSETTS CAPITAL RESOURCE COMPANY         
                                                                               
                                                                               
                                By:/s/ Joan C. McArdle                         
                                   ---------------------------------
                                     Joan C. McArdle, Vice President           
                                                                               
                                BEB LIMITED PARTNERSHIP IV                     
                                                                               
                                By:  Entrepreneurial, Inc., its General        
                                     Partner                                   
                                                                               
                                                                               
                                By:/s/ Torrence C. Harder                      
                                   ------------------------------------        
                                      Torrence C. Harder, President            
                                                                               
                                BEB LIMITED PARTNERSHIP I                      
                                                                               
                                By:  BEB, Inc., its General Partner            
                                                                               
                                                                               
                                By:/s/ Torrence C. Harder                      
                                   ------------------------------------        
                                      Torrence C. Harder, President            
                                                                               
                                BEB LIMITED PARTNERSHIP II                     
                                                                               
                                By: BEB, Inc., its General Partner             
                                                                               
                                                                               
                                By:/s/ Torrence C. Harder                      
                                   ------------------------------------        
                                     Torrence C. Harder, President             
                                                                               
                                D. QUINN MILLS, INC. PENSION PLAN              
                                                                               
                                                                               
                                By:/s/ D. Quinn Mills                          
                                   ------------------------------------        
                                     D. Quinn Mills, Administrator             
                                                                               
                                D. QUINN MILLS, INC. PROFIT SHARING            
                                     PLAN                                      
                                                                               
                                By:/s/ D. Quinn Mills                          
                                   ------------------------------------        
                                     D. Quinn Mills, Administrator     
<PAGE>
 
                                _______________________________________
                                     Michael Adam Perfit

                               ARTICLE VII TRUST

                                By:/s/ Randolph P. Barton                    
                                   ------------------------------------      
                                     Randolph P. Barton, Trustee             
                                                                             
                                /s/ J. Bryan Mims                            
                                ---------------------------------------      
                                     J. Bryan Mims                           
                                                                             
                                /s/ Susan Mims                               
                                ----------------------------------------     
                                     Susan Mims                              
                                                                             
                                ELIE RIVOLLIER, JR., ROLLOVER IRA            
                                                                             
                                By:/s/ Elie Rivollier, Jr.                   
                                   -------------------------------------     
                                                                             
                                STONMI REALTY TRUST                          
                                                                             
                                By:/s/ Arthur J. Epstein                     
                                   -----------------------------------       
                                     Arthur J. Epstein, Trustee              
                                                                             
                                JOHN A. WHITTEMORE INSURANCE AGENCY,         
                                     INC.  PROFIT SHARING RETIREMENT         
                                     TRUST                                   
                                                                             
                                By:/s/ John A. Whittemore                    
                                   ------------------------------------      
                                     John A. Whittemore, Trustee             
                                                                             
                                /s/ William P. Hood                          
                                ---------------------------------------      
                                     William P. Hood                         
                                                                             
                                /s/ J. Neil Benney                           
                                ---------------------------------------      
                                     J. Neil Benney                          
                                                                             
                                /s/ Jonathan M. Keyes                        
                                ----------------------------------------     
                                     Jonathan M. Keyes                       
                                                                             
                                PENSCO PENSION SERVICES, INC. F/B/O          
                                     MICHAEL A PERFIT, IRA                   
                                                                             
                                By:____________________________________      
                                                                             
                                                                             
                                /s/ Lisa A. Mills                            
                                ---------------------------------------      
                                     Lisa A. Mills                           
                                                                             
                                                                             
                                /s/ Joyce S. Mills                           
                                ---------------------------------------      
                                     Joyce S. Mills                           
<PAGE>
 
                                /s/ Deborah Mills Folk                    
                                ---------------------------------------   
                                     Deborah Mills Folk                   
                                                                          
                                                                          
                                /s/ William E. Northfield                 
                                ---------------------------------------   
                                     William E. Northfield                
                                                                          
                                                                          
                                /s/ John B. Pepper                        
                                ---------------------------------------   
                                     John B. Pepper                       
                                                                          
                                                                          
                                /s/ A. Harold Howell                      
                                ---------------------------------------   
                                     A. Harold Howell                     
                                                                          
                                                                          
                                /s/ Elie Rivollier, Jr.                   
                                ---------------------------------------   
                                     Elie Rivollier, Jr.                  
                                                                          
                                                                          
                                /s/ D. Quinn Mills                        
                                ---------------------------------------   
                                     D. Quinn Mills, As Custodian for     
                                     Shirley E. Mills Under the           
                                     Massachusetts Uniform Transfers      
                                     to Minors Act                         
<PAGE>
 
                                AMENDMENT NO. 4
                                       TO
                         REGISTRATION RIGHTS AGREEMENT

     Agreement made as of this 3rd day of April 1996 by and among Lightbridge,
Inc. (formerly known as Credit Technologies, Inc.), a Delaware corporation (the
"Company"), and the persons whose names and signatures are set forth below.

     WHEREAS, the Company has entered into a certain Registration Rights
Agreement, dated as of February 11, 1991, as amended by Amendment No. 1 To
Registration Rights Agreement dated as of December 19, 1991, Amendment No. 2 To
Registration Rights Agreement dated as of June 9, 1993 and Amendment No. 3 To
Registration Rights Agreement dated as of August 29, 1994 (as so amended, the
"Registration Rights Agreement") with Entrepreneurial Limited Partnership I
(formerly known as BEB Limited Partnership I), Entrepreneurial Limited
Partnership II (formerly known as BEB Limited Partnership II), certain
purchasers of its Series A, Series B and Series C Convertible Preferred Stock
and certain purchasers of subordinated notes and common stock purchase warrants
issued by the Company; and

     WHEREAS, the Company has agreed to issue and sell an aggregate of 1,000,000
shares of the Company's Series D Convertible Preferred Stock pursuant to a
certain Series D Convertible Preferred Stock Purchase Agreement, dated the date
hereof, and to grant the purchasers thereunder (the "New Purchasers") certain
registration rights;

     NOW THEREFORE, in consideration of the foregoing and other good and
valuable consideration, the receipt of which is hereby acknowledged, the parties
hereto do hereby agree with each other as follows:

     1.   The Registration Rights Agreement is hereby amended by deleting
therefrom the definition of "Preferred Shares" in Section 1 thereof and
substituting therefor the following definition:

          "Preferred Shares" shall mean those shares of the Company's: (i)
Series A Convertible Preferred Stock issued and sold pursuant to a certain
Series A Convertible Preferred Stock Purchase Agreement, dated as of February
11, 1991, by and among the Company and the Purchasers named in Schedule I
thereto, (ii) Series B Convertible Preferred Stock issued and sold pursuant to a
certain Series B Convertible Preferred Stock Purchase Agreement, dated as of
December 19, 1991, by and among the Company and the Purchasers named in Schedule
I thereto, (iii) Series C Convertible Preferred Stock issued and sold pursuant
to a certain Series C Convertible Preferred Stock Purchase Agreement, dated as
of June 9, 1993, by and among the Company and
<PAGE>
 
the Purchasers named in Schedule I thereto, and (iv) Series D Convertible
Preferred Stock issued and sold pursuant to a certain Series D Convertible
Preferred Stock Purchase Agreement, dated as of April 3, 1996, by and among the
Company and the Purchasers named in Schedule I thereto.

     2.   Each of the New Purchasers is hereby made a party to the Registration
Rights Agreement as a "Purchaser" thereunder and the New Purchasers shall be
subject to and entitled to all of the rights and benefits contained in the
Registration Rights Agreement.

     3.   The Registration Rights Agreement is hereby further amended by
deleting the reference to "40%" in clause (ii) of Section 4(a) and
substituting therefor "25%".

     4.   The Registration Rights Agreement is hereby further amended by
deleting the reference to "two-thirds" in Section 13(d) and substituting
therefor "75%".

     5.   The Registration Rights Agreement, as herein amended, is hereby
ratified and confirmed.

     6.   This Agreement shall be governed by, and construed in accordance
with, the laws of the Commonwealth of Massachusetts.

     7.   This Agreement shall be binding upon and inure to the benefit of the
parties hereto and their respective successors and assigns, legal
representatives and heirs.

     8.   This Agreement may be executed in one or more counterparts, each of
which shall be deemed to be an original, but all of which taken together shall
together constitute one and the same instrument.

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement on the
day, month and year first above written.

                                        LIGHTBRIDGE, INC.


                                        By:/s/ Pamela D.A. Reeve
                                           --------------------------------
                                           Pamela D.A. Reeve, President and
                                           Chief Executive Officer
<PAGE>
 
                               LIGHTBRIDGE, INC.
                                 SIGNATURE PAGE
                                       TO
                                AMENDMENT NO. 4
                                       TO
                          RESTRICTION RIGHTS AGREEMENT


     The undersigned hereby executes and delivers the Amendment No. 4 to
Registration Rights Agreement (the "Agreement") to which this Signature Page is
attached, which Agreement and Signature Page, together with all counterparts of
said Agreement and Signature Pages of the other parties named in said Agreement,
shall constitute one and the same document in accordance with the terms of said
Agreement.



GLOBAL PRIVATE EQUITY II LIMITED PARTNERSHIP

By: Advent International Limited Partnership, General Partner
By: Advent International Corp., General Partner
By: Andrew Fillat, Senior Vice President

ADVENT INTERNATIONAL INVESTORS II LIMITED PARTNERSHIP
ADVENT PARTNERS LIMITED PARTNERSHIP

By: Advent International Corp., General Partner
By: Andrew Fillat, Senior Vice President



/s/ Andrew Fillat
- --------------------------------------------
Andrew Fillat, for all of the above
<PAGE>
 
                               LIGHTBRIDGE, INC.
                                 SIGNATURE PAGE
                                       TO
                                AMENDMENT NO. 4
                                       TO
                         REGISTRATION RIGHTS AGREEMENT

     The undersigned hereby executes and delivers the Amendment No. 4 to
Registration Rights Agreement (the "Agreement") to which this Signature Page is
attached, which Agreement and Signature Page, together with all counterparts of
said Agreement and Signature Pages of the other parties named in said Agreement,
shall constitute one and the same document in accordance with the terms of said
Agreement.

                                        Massachusetts Capital        
                                        Resource Company             
                                        -----------------------------
                                        Name of Securityholder       
                                                                     
                                        By:/s/ Joan C. McArdle       
                                           --------------------------
                                                                     
                                        Print Name:Joan C. McArdle   
                                                   ------------------
                                                                     
                                        Title:Vice President         
                                              -----------------------
                                                                     
                                                                     
                                        Date:April 3, 1996           
                                             ------------------------
<PAGE>
 
                               LIGHTBRIDGE, INC.
                                 SIGNATURE PAGE
                                       TO
                                AMENDMENT NO. 4
                                       TO
                         REGISTRATION RIGHTS AGREEMENT

     The undersigned hereby executes and delivers the Amendment No. 4 to
Registration Rights Agreement (the "Agreement") to which this Signature Page is
attached, which Agreement and Signature Page, together with all counterparts of
said Agreement and Signature Pages of the other parties named in said Agreement,
shall constitute one and the same document in accordance with the terms of said
Agreement.



                                 ----------------------------------------------
                                 Name of Securityholder        
                                              
                                 By:/s/ Torrence C. Harder, General Partner     
                                    -------------------------------------------
                                                                             
                                 Print Name:
                                 ----------------------------------------------
                                                                             
                                 Title:________________________________________
                                                                                
                                                                                
                                 Date:  April 3, 1996
                                      -----------------------------------------
 
                                     Entrepreneurial Limited Partnership I
                                     Entrepreneurial Limited Partnership II
                                     Entrepreneurial Limited Partnership IV

                                     By: Entrepreneurial Ventures, Inc.

                                     By: Torrence C. Harder, President
                                     General Partner, Entrepreneurial LP - I
<PAGE>
 
                               LIGHTBRIDGE, INC.
                                 SIGNATURE PAGE
                                       TO
                                AMENDMENT NO. 4
                                       TO
                         REGISTRATION RIGHTS AGREEMENT

     The undersigned hereby executes and delivers the Amendment No. 4 to
Registration Rights Agreement (the "Agreement") to which this Signature Page is
attached, which Agreement and Signature Page, together with all counterparts of
said Agreement and Signature Pages of the other parties named in said Agreement,
shall constitute one and the same document in accordance with the terms of said
Agreement.



                                            Spindle Limited Partnership  
                                            -----------------------------
                                            Name of Securityholder       
                                                                         
                                            By:/s/ Randolph P. Barton
                                               --------------------------
                                                                         
                                            Print Name:__________________
                                                                         
                                            Title:General Partner        
                                                  -----------------------
                                                                         
                                                                         
                                            Date:April 1, 1996           
                                                 ------------------------
<PAGE>
 
                               LIGHTBRIDGE, INC.
                                 SIGNATURE PAGE
                                       TO
                                AMENDMENT NO. 4
                                       TO
                         REGISTRATION RIGHTS AGREEMENT

     The undersigned hereby executes and delivers the Amendment No. 4 to
Registration Rights Agreement (the "Agreement") to which this Signature Page is
attached, which Agreement and Signature Page, together with all counterparts of
said Agreement and Signature Pages of the other parties named in said Agreement,
shall constitute one and the same document in accordance with the terms of said
Agreement.



                                               D. Quinns Mills, Inc. Profit  
                                               Sharing Plan                  
                                               ----------------------------  
                                               Name of Securityholder        
                                                                             
                                               By:/s/ D. Quinn Mills         
                                                  ---------------------------
                                                                             
                                               Print Name:___________________
                                                                             
                                               Title:________________________
                                                                             
                                                                             
                                               Date:April 3, 1996            
                                                    -------------------------
<PAGE>
 
                               LIGHTBRIDGE, INC.
                                 SIGNATURE PAGE
                                       TO
                                AMENDMENT NO. 4
                                       TO
                         REGISTRATION RIGHTS AGREEMENT

     The undersigned hereby executes and delivers the Amendment No. 4 to
Registration Rights Agreement (the "Agreement") to which this Signature Page is
attached, which Agreement and Signature Page, together with all counterparts of
said Agreement and Signature Pages of the other parties named in said Agreement,
shall constitute one and the same document in accordance with the terms of said
Agreement.



                                            Michael Adam Perfit           
                                            8/27/93 Trust                  
                                            ------------------------------ 
                                            Name of Securityholder         

                                            By:/s/ Michael Adam Perfit     
                                               --------------------------- 
                                                                           
                                            Print Name:Michael Adam Perfit 
                                                       -------------------  
                                                                           
                                            Title:Trustee                  
                                                  ------------------------ 
                                                                           
                                                                           
                                            Date:March 29, 1996            
                                                 ------------------------- 
<PAGE>
 
                               LIGHTBRIDGE, INC.
                                 SIGNATURE PAGE
                                       TO
                                AMENDMENT NO. 4
                                       TO
                         REGISTRATION RIGHTS AGREEMENT

     The undersigned hereby executes and delivers the Amendment No. 4 to
Registration Rights Agreement (the "Agreement") to which this Signature Page is
attached, which Agreement and Signature Page, together with all counterparts of
said Agreement and Signature Pages of the other parties named in said Agreement,
shall constitute one and the same document in accordance with the terms of said
Agreement.



                                             John A. Whittemore            
                                             ----------------------------- 
                                             Name of Securityholder        
                                                                           
                                             By:/s/ John A. Whittemore     
                                                ---------------------------
                                                                           
                                             Print Name:John A. Whittemore 
                                                        -------------------
                                                                           
                                             Title: N/A
                                                   ------------------------
                                                                           
                                             Date:4-1-96                   
                                                  -------------------------

<PAGE>
 
                                                                    EXHIBIT 10.2
                           CREDIT TECHNOLOGIES, INC.


               Subordinated Note and Warrant Purchase Agreement
                          Dated as of August 29, 1994
<PAGE>
 
                          CREDIT TECHNOLOGIES , INC.
               Subordinated Note and Warrant Purchase Agreement
                          Dated as of August 29, 1994
                                     INDEX
                                     -----

<TABLE> 
<CAPTION> 
                                                                           Page
                                                                           ----
<S>                                                                        <C>
ARTICLE I                                                                    
- ---------                                                                    
                                                                             
     Purchase, Sale and Terms of Notes and Warrants                          
     ----------------------------------------------                          
                                                                             
     1.01  The Notes........................................................  1
     1.02  The Warrants.....................................................  1
     1.03  Purchase and Sale of Notes and Warrants..........................  1
           (a)  The Closing.................................................  1
           (b)  Use of Proceeds.............................................  2
     1.04  Payments and Endorsements........................................  2
     1.05  Redemptions......................................................  3
           (a)  Required Redemptions........................................  3
           (b)  Optional Redemptions With Premium...........................  3
           (c)  Notice of Redemptions; Pro rata Redemptions.................  3
     1.06  Payment on Non-Business Days.....................................  3
     1.07  Registration, etc................................................  4
     1.08  Transfer and Exchange of Notes...................................  4
     1.09  Replacement of Notes.............................................  4
     1.10  Subordination....................................................  5
           (a)  Payment of Senior Debt......................................  5
           (b)  No Payment on Notes Under Certain Conditions................  6
           (c)  Payments Held in Trust......................................  6
           (d)  Subrogation.................................................  6
           (e)  Scope of Section............................................  7
           (f)  Survival of Rights..........................................  7
           (g)  Amendment or Waiver.........................................  7
           (h)  Senior Debt Defined.........................................  8
     1.11  Representations by the Purchasers; Legend........................  8
           (a)  Representations by the Purchasers...........................  8
           (b)  Legend......................................................  9
     1.12  Disclosure of Information by MCRC................................  9
                                                                             
ARTICLE II                                                                   
- ----------                                                                   
                                                                             
     Conditions to Purchasers' Obligation                                    
     ------------------------------------                                    
                                                                             
     2.01  Representations and Warranties..................................  10
     2.02  Documentation at Closing........................................  10
     2.03  Other Transactions..............................................  11
</TABLE>                                                                       
                                                                               
                                      -i-                                      
                                                                               
<PAGE>
 
<TABLE>
<S>                                                                                                                   <C>
ARTICLE III
- -----------
 
           Representations and Warranties
           ------------------------------
 
     3.01  Organization and Standing of the Company.................................................................  12
     3.02  Corporate Action.........................................................................................  12
     3.03  Governmental Approvals...................................................................................  12
     3.04  Litigation...............................................................................................  13
     3.05  Compliance with Other Instruments........................................................................  13
     3.06  Federal Reserve Regulations..............................................................................  14
     3.07  Title to Assets, Patents.................................................................................  14
     3.08  Financial Information....................................................................................  14
     3.09  Taxes....................................................................................................  15
     3.10  ERISA....................................................................................................  15
     3.11  Transactions with Affiliates.............................................................................  15
     3.12  Assumptions or Guaranties of Indebtedness of Other Persons...............................................  15
     3.13  Investments in Other Persons.............................................................................  16
     3.14  Equal Employment Opportunity.............................................................................  16
     3.15  Status of Notes and Warrants as Qualified Investments....................................................  16
     3.16  Securities Act...........................................................................................  17
     3.17  Disclosure...............................................................................................  17
     3.18  No Brokers or Finders....................................................................................  17
     3.19  Other Agreements of Officers.............................................................................  17
     3.20  Capitalization; Status of Capital Stock..................................................................  18
     3.21  Labor Relations..........................................................................................  18
     3.22  Insurance................................................................................................  19
     3.23  Key Man Insurance........................................................................................  19
     3.24  Books and Records........................................................................................  19
     3.25  Foreign Corrupt Practices Act............................................................................  19
     3.26  Registration Rights......................................................................................  19
 
ARTICLE IV
- ----------
 
     Covenants of the Company
     ------------------------
 
     4.01  Affirmative Covenants of the Company Other Than Reporting Requirements...................................  19
           (a)  Punctual Payment....................................................................................  19
           (b)  Payment of Taxes and Trade Debt.....................................................................  20
           (c)  Maintenance of Insurance............................................................................  20
           (d)  Preservation of Corporate Existence.................................................................  20
           (e)  Compliance with Laws................................................................................  20
           (f)  Visitation Rights...................................................................................  21
           (g)  Keeping of Records and Books of Account.............................................................  21
           (h)  Maintenance of Properties, etc......................................................................  21
           (i)  Compliance with ERISA...............................................................................  21
           (j)  Maintenance of Debt to Equity Ratio.................................................................  21
           (k)  Interest Coverage...................................................................................  21
           (l)  Foreign Corrupt Practices Act.......................................................................  22
           (m)  Equal Employment Opportunity........................................................................  22
</TABLE>

                                     -ii-
<PAGE>
 
<TABLE>
<S>                                                                                                                   <C>
           (n)  Status of Notes and Warrants as Qualified Investments...............................................  22
           (o)  Key Man Life Insurance..............................................................................  22
           (p)  Attendance at Board Meetings........................................................................  23
           (q)  Compensation........................................................................................  23
     4.02  Negative Covenants of the Company........................................................................  23
           (a)  Liens...............................................................................................  23
           (b)  Indebtedness........................................................................................  24
           (c)  Lease Obligations...................................................................................  25
           (d)  Assumptions or Guaranties of Indebtedness of Other Persons..........................................  25
           (e)  Mergers, Sale of Assets, etc........................................................................  25
           (f)  Investments in Other Persons........................................................................  26
           (g)  Distributions.......................................................................................  26
           (h)  Dealings with Affiliates............................................................................  27
           (i)  Maintenance of Ownership of Subsidiaries............................................................  27
           (j)  Change in Nature of Business........................................................................  28
     4.03  Reporting Requirements...................................................................................  28
     4.04  Termination of Certain Covenants of the Company..........................................................  30

ARTICLE V
- ---------

     Events of Default
     -----------------

     5.01  Events of Default........................................................................................  30
     5.02  Annulment of Defaults....................................................................................  32

ARTICLE VI
- ----------

     Definitions and Accounting Terms
     --------------------------------

     6.01  Certain Defined Terms....................................................................................  32
     6.02  Accounting Terms.........................................................................................  35

ARTICLE VII
- -----------

     Miscellaneous
     -------------

     7.01  No Waiver; Cumulative Remedies...........................................................................  36
     7.02  Amendments, Waivers and Consents.........................................................................  36
     7.03  Addresses for Notices, etc...............................................................................  36
     7.04  Costs, Expenses and Taxes................................................................................  37
     7.05  Binding Effect; Assignment...............................................................................  38
     7.06  Survival of Representations and Warranties...............................................................  38
     7.07  Prior Agreements.........................................................................................  38
     7.08  Severability.............................................................................................  38
     7.09  Governing Law............................................................................................  38
     7.10  Headings.................................................................................................  38
     7.11  Sealed Instrument........................................................................................  38
     7.12  Counterparts.............................................................................................  38
     7.13  Further Assurances.......................................................................................  38
     7.14  Acknowledgment...........................................................................................  38


SCHEDULE 

     Schedule of Purchasers

EXHIBITS

     1.01    Form of Subordinated Notes                                         
     1.02    Form of Common Stock Purchase Warrants
     2.02(b) Matters to be Covered by Opinion Letter
     2.03(a) Form of Amendment No.3 to Registration Rights Agreement
     3.04    Schedule of Litigation
     3.05    Schedule of Indebtedness
     3.07    Schedule of Mortgages, Pledges, etc.
     3.08    Financial Statements
     3.11    Schedule of Transactions with Affiliates
     3.13    Schedule of Investments in Other Persons
     3.15    Certificate re "Qualified Investments"
     3.20    Schedule of Capital Stock, Options and Other Rights
</TABLE>

                                     -iii-
<PAGE>
 
                           CREDIT TECHNOLOGIES, INC.
                               281 Winter Street
                          Waltham, Massachusetts 02154


                                                           As of August 29, 1994



To the Persons Listed in the Schedule of
  Purchasers Attached Hereto

     Re:  Subordinated Notes due 2001 and
          Common Stock Purchase Warrants

Gentlemen:

     Credit Technologies, Inc., a Delaware corporation (the "Company"), hereby
agrees with each person listed in the Schedule of Purchasers attached hereto
(individually a "Purchaser" and collectively the "Purchasers") as follows:

                                   ARTICLE I

                 PURCHASE, SALE AND TERMS OF NOTES AND WARRANTS

     1.01 The Notes.  The Company has authorized the issuance and sale to the
          ---------                                                          
Purchasers, in the respective amounts set forth in the Schedule of Purchasers
attached hereto, of the Company's Subordinated Notes, due June 30, 2001, in the
original aggregate principal amount of $2,100,000.  The Subordinated Notes shall
be substantially in the form set forth in Exhibit 1.01 hereto and are herein
                                          ------------                      
referred to individually as a "Note" and collectively as the "Notes", which
terms shall also include any notes delivered in exchange or replacement
therefor.

     1.02 The Warrants.  The Company has also authorized the issuance and sale
          ------------                                                        
to the Purchasers, in the respective amounts set forth in the Schedule of
Purchasers attached hereto, of the Company's Common Stock Purchase Warrants for
the purchase (subject to adjustment as provided therein) of an aggregate of
262,500 shares of the Company's Common Stock.  The Common Stock Purchase
Warrants shall be substantially in the form set forth in Exhibit 1.02 hereto and
                                                         ------------           
are herein referred to individually as a "Warrant" and collectively as the
"Warrants", which terms shall also include any warrants delivered in exchange or
replacement therefor.

     1.03 Purchase and Sale of Notes and Warrants.
          --------------------------------------- 

          (a)  The Closing.  The Company agrees to issue and sell to the
               -----------                                              
Purchasers, and, subject to and in reliance upon the representations,
warranties, terms and conditions of this Agreement, the Purchasers agree to
purchase, the Notes and the
<PAGE>
 
Warrants set forth opposite their respective names in the Schedule of Purchasers
attached hereto for the aggregate purchase price set forth therein.  Such
purchase and sale shall take place at a closing (the "Closing") to be held at
the office of Messrs.  Testa, Hurwitz & Thibeault, Exchange Place, 53 State
Street, Boston, Massachusetts, on August 29, 1994 at 2:00 P.M., or on such other
date and at such time as may be mutually agreed upon.  At the Closing, the
Company will issue and deliver to each Purchaser (i) one Note, payable to the
order of such Purchaser, in the principal amount of set forth opposite such
Purchaser's name in the Schedule of Purchasers attached hereto, and (ii) one
Warrant, registered in the name of such Purchaser, exercisable for that number
of shares of Common Stock which is set forth opposite such Purchaser's name in
the Schedule of Purchasers attached hereto, against delivery of a check or a
receipt of a wire transfer in payment of the purchase price for the Notes and
Warrants to be purchased by such Purchaser.

          (b) Allocation of Purchase Price.  The Company and the Purchasers,
              ----------------------------                                  
having adverse interests and as a result of arm's length bargaining, agree that
(i) none of the Purchasers or any of their partners has rendered or has agreed
to render any services to the Company in connection with this Agreement or the
issuance of the Notes and Warrants; (ii) the Warrants are not being issued as
compensation; and (iii) for the purpose, and within the meaning, of Section
1273(c)(2) of the Internal Revenue Code of 1986, as amended, the issue price of
the Warrants is $21,000 and the issue price of the Notes is $2,079,000.  The
Company and the Purchasers acknowledge that this allocation is based on the
relative fair market values of the Notes and Warrants.  The Company and the
Purchasers recognize that this Agreement determines the original issue discount
to be taken into account by the Company and the Purchaser for federal income tax
purposes on the Notes and they agree to adhere to this Agreement for such
purposes.

          (c) Use of Proceeds.  The Company agrees to use the full proceeds from
              ---------------                                                   
the sale of the Notes and Warrants solely for working capital and agrees that
full proceeds from the sale of the Notes and Warrants will be utilized for
purposes which increase or maintain equal opportunity employment in the
Commonwealth of Massachusetts.

     1.04 Payments and Endorsements.  Payments of principal, interest and
          -------------------------                                      
premium, if any, on the Notes, shall be made directly by check duly mailed or
delivered to each Purchaser at its address referred to in Section 7.03 hereof,
without any presentment or notation of payment, except that prior to any
transfer of any Note, the holder of record shall endorse on such Note a record
of the date to which interest has been paid and all payments made on account of
principal of such Note.

                                       2
<PAGE>
 
     1.05 Redemptions.
          ----------- 

          (a) Required Redemptions.  Beginning on and with September 30, 1997,
              --------------------                                            
and on the last day of December, March, June and September in each year
thereafter through and including June 30, 2001, the Company will redeem, without
premium, $131,250 in principal amount of the Notes, or such lesser amount as may
be then outstanding, together with all accrued and unpaid interest then due on
the amount so redeemed.  On the stated or accelerated maturity of the Notes, the
Company will pay the principal amount of the Notes then outstanding together
with all accrued and unpaid interest then due thereon.  No optional redemption
of less than all of the Notes shall affect the obligation of the Company to make
the redemptions required by this subsection.

          (b) Optional Redemptions With Premium.  Except as provided in
              ---------------------------------                        
subsection 1.05(a), the Company may at any time redeem the Notes in whole or in
part (in integral multiples of $10,000) together with interest due on the amount
so redeemed through the date of redemption, and a premium equal to the
percentage of the principal amount of the Notes redeemed under this subsection
applicable to the period in which such redemption is made, as follows:

<TABLE>
<CAPTION>
          Period
     Starting - Ending                       Premium
     -----------------                       -------
     <S>                                     <C>
     Date of Agreement - June 30, 1996         8%  
     July 1, 1996 - June 30, 1998              6%  
     July 1, 1998 - June 30, 2000              4%  
     July 1, 2000 and thereafter               2%  
</TABLE>

provided that no premium shall be due in connection with any surrender to the
- --------                                                                     
Company of any Notes in payment of all or part of the exercise price due upon
exercise of any Warrants.

          (c) Notice of Redemptions; Pro rata Redemptions.  Notice of any
              -------------------------------------------                
optional redemptions pursuant to Subsection 1.05(b) shall be given to all
registered holders of the Notes at least ten (10) business days prior to the
date of such redemption.  Each redemption of Notes pursuant to subsections
1.05(a) or (b) shall be made so that the Notes then held by each holder shall be
redeemed in a principal amount which shall bear the same ratio to the total
principal amount of Notes being redeemed as the principal amount of Notes then
held by such holder bears to the aggregate principal amount of the Notes then
outstanding.

     1.06 Payment on Non-Business Days.  Whenever any payment to be made shall
          ----------------------------                                        
be due on a Saturday, Sunday or a public holiday under the laws of the
Commonwealth of Massachusetts, such payment may be made on the next succeeding
business day, and such

                                       3
<PAGE>
 
extension of time shall in such case be included in the computation of payment
of interest due.

     1.07 Registration, etc.  The Company shall maintain at its principal office
          ------------------                                                    
a register of the Notes and shall record therein the names and addresses of the
registered holders of the Notes, the address to which notices are to be sent and
the address to which payments are to be made as designated by the registered
holder if other than the address of the holder, and the particulars of all
transfers, exchanges and replacements of Notes.  No transfer of a Note shall be
valid unless made on such register for the registered holder or his executors or
administrators or his or their duly appointed attorney, upon surrender therefor
for exchange as hereinafter provided, accompanied by an instrument in writing,
in form and execution reasonably satisfactory to the Company.  Each Note issued
hereunder, whether originally or upon transfer, exchange or replacement of a
Note or Notes, shall be registered on the date of execution thereof by the
Company and shall be dated the date to which interest has been paid on such
Notes or Note.  The registered holder of a Note shall be that Person in whose
name the Note has been so registered by the Company.  A registered holder shall
be deemed the owner of a Note for all purposes of this Agreement and, subject to
the provisions hereof, shall be entitled to the principal, premium, if any, and
interest evidenced by such Note free from all equities or rights of setoff or
counterclaim between the Company and the transferor of such registered holder or
any previous registered holder of such Note.

     1.08 Transfer and Exchange of Notes.  Subject to compliance with federal
          ------------------------------                                     
and applicable state securities laws, the registered holder of any Note or Notes
may, prior to maturity or prepayment thereof, surrender such Note or Notes at
the principal office of the Company for transfer or exchange. within a
reasonable time after notice to the Company from a registered holder of its
intention to make such exchange and without expense (other than transfer taxes,
if any) to such registered holder, the Company shall issue in exchange therefor
another Note or Notes, in such denominations as requested by the registered
holder, for the same aggregate principal amount as the unpaid principal amount
of the Note or Notes so surrendered and having the same maturity and rate of
interest, containing the same provisions and subject to the same terms and
conditions as the Note or Notes so surrendered.  Each new Note shall be made
payable to such Person or Persons, or registered assigns, as the registered
holder of such surrendered Note or Notes may designate, and such transfer or
exchange shall be made in such a manner that no gain or loss of principal or
interest shall result therefrom.

     1.09 Replacement of Notes.  Upon receipt of evidence satisfactory to the
          --------------------                                               
Company of the loss, theft, destruction or mutilation of any Note and, if
requested in the case of any such

                                       4
<PAGE>
 
loss, theft or destruction, upon delivery of an indemnity bond or other
agreement or security reasonably satisfactory to the Company, or, in the case of
any such mutilation, upon surrender and cancellation of such Note, the Company
will issue a new Note, of like tenor and amount and dated the date to which
interest has been paid, in lieu of such lost, stolen, destroyed or mutilated
Note; provided, however, if any Note of which Massachusetts Capital Resource
      --------  -------
Company, its nominee, or any of its partners is the registered holder is lost,
stolen or destroyed, the affidavit of the President, Treasurer or any Assistant
Treasurer of the registered holder setting forth the circumstances with respect
to such loss, theft or destruction shall be accepted as satisfactory evidence
thereof, and no indemnification bond or other security shall be required as a
condition to the execution and delivery by the Company of a new Note in
replacement of such lost, stolen or destroyed Note other than the registered
holder's written agreement to indemnify the Company.

     1.10 Subordination.  The Company, for itself, its successors and assigns,
          -------------                                                       
covenants and agrees, and each Purchaser and each successor holder of the Notes
by his or its acceptance thereof, likewise covenants and agrees, that
notwithstanding any other provision of this Agreement or the Notes, the payment
of the principal of and interest on each and all of the Notes shall be
subordinated in right of payment, to the extent and in the manner hereinafter
set forth, to the prior payment in full of all Senior Debt (as hereinafter
defined) at any time outstanding.  The provisions of this Section 1.10 shall
constitute a continuing representation to all Persons who, in reliance upon such
provisions, become the holders of or continue to hold Senior Debt, and such
provisions are made for the benefit of the holders of Senior Debt, and such
holders are hereby made obligees hereunder the same as if their names were
written herein as such, and they or any of them may proceed to enforce such
provisions against the Company or against the holder of any Note without the
necessity of joining the Company as a party.

          (a) Payment of Senior Debt.  In the event of any insolvency or
              ----------------------                                    
bankruptcy proceedings, or any receivership, liquidation, reorganization or
other similar proceedings in connection therewith, relative to the Company or to
its property, or, in the event of any proceedings for voluntary liquidation,
dissolution or other winding up of the Company or distribution or marshaling of
its assets or any composition with creditors of the Company, whether or not
involving insolvency or bankruptcy, then and in any such event all Senior Debt
shall be paid in full before any payment or distribution of any character,
whether in cash, securities or other property, shall be made on account of the
Notes; and any such payment or distribution, except securities which are
subordinated and junior in right of payment to the payment of all Senior Debt
then outstanding in terms of substantially the same tenor as this Section 1.10,
which would,

                                       5
<PAGE>
 
but for the provisions hereof, be payable or deliverable in respect of the Notes
shall be paid or delivered directly to the holders of Senior Debt (or their duly
authorized representatives), in the proportions in which they hold the same,
until all Senior Debt shall have been paid in full, and every holder of the
Notes by becoming a holder thereof shall have designated and appointed the
holder or holders of Senior Debt (and their duly authorized representatives) as
his or its agents and attorney-in-fact to demand, sue for, collect and receive
such Senior Debt holder's ratable share of all such payments and distributions
and to file any necessary proof of claim therefor and to take all such other
action in the name of the holders of the Notes or otherwise, as such Senior Debt
holders (or their authorized representatives) may determine to be necessary or
appropriate for the enforcement of this Section 1.10. Each Purchaser and each
successor holder of the Notes by its or his acceptance thereof agrees to
execute, at the request of the Company, a separate agreement with any holder of
Senior Debt on the terms set forth in this Section 1.10, and to take all such
other action as such holder or such holder's representative may request in order
to enable such holder to enforce all claims upon or in respect of such holder's
ratable share of the Notes.

          (b) No Payment on Notes Under Certain Conditions.  In the event that
              --------------------------------------------                    
any default occurs in the payment of the principal of or interest on any Senior
Debt (whether as a result of the acceleration thereof by the holders of such
Senior Debt or otherwise) and during the continuance of such default for a
period up to ninety (90) days and thereafter if judicial proceedings shall have
been instituted with respect to such defaulted payment, or (if a shorter period)
until such payment has been made or such default has been cured or waived in
writing by such holder of Senior Debt then and during the continuance of such
event no payment of principal or interest on the Notes shall be made by the
Company or accepted by any holder of the Notes who has received notice from the
Company or from a holder of Senior Debt of such events.

          (c) Payments Held in Trust.  In case any payment or distribution shall
              ----------------------                                            
be paid or delivered to any holder of the Notes before all Senior Debt shall
have been paid in full, despite or in violation or contravention of the terms of
this subordination, such payment or distribution shall be held in trust for and
paid and delivered ratably to the holders of Senior Debt (or their duly
authorized representatives), until all Senior Debt shall have been paid in full.

          (d) Subrogation.  Subject to the payment in full of all Senior Debt
              -----------                                                    
and until the Notes shall be paid in full, the holders of the Notes shall be
subrogated to the rights of the holders of Senior Debt (to the extent of
payments or distributions previously made to such holders of Senior Debt
pursuant to the provisions of

                                       6
<PAGE>
 
subsections (a) and (c) of this Section 1.10) to receive payments or
distributions of assets of the Company applicable to the Senior Debt.  No such
payments or distributions applicable to the Senior Debt shall, as between the
Company and its creditors, other than the holders of Senior Debt and the holders
of the Notes, be deemed to be a payment by the Company to or on account of the
Notes; and for the purposes of such subrogation, no payments or distributions to
the holders of Senior Debt to which the holders of the Notes would be entitled
except for the provisions of this Section 1.10 shall, as between the Company and
its creditors, other than the holders of Senior Debt and the holders of the
Notes, be deemed to be a payment by the Company to or on account of the Senior
Debt.

          (e) Scope of Section.  The provisions of this Section 1.10 are
              ----------------
intended solely for the purpose of defining the relative rights of the holders
of the Notes, on the one hand, and the holders of the Senior Debt, on the other
hand. Nothing contained in this Section 1.10 or elsewhere in this Agreement or
the Notes is intended to or shall impair, as between the Company, its creditors
other than the holders of Senior Debt, and the holders of the Notes, the
obligation of the Company, which is unconditional and absolute, to pay to the
holders of the Notes the principal of and interest on the Notes as and when the
same shall become due and payable in accordance with the terms thereof, or to
affect the relative rights of the holders of the Notes and creditors of the
Company other than the holders of the Senior Debt, nor shall anything herein or
therein prevent the holder of any Note from accepting any payment with respect
to such Note or exercising all remedies otherwise permitted by applicable law
upon default under such Note, subject to the rights, if any, under this Section
1.10 of the holders of Senior Debt in respect of cash, property or securities of
the Company received by the holders of the Notes.

          (f) Survival of Rights.  The right of any present or future holder of
              ------------------                                               
Senior Debt to enforce subordination of the Notes pursuant to the provisions of
this Section 1.10 shall not at any time be prejudiced or impaired by any act or
failure to act on the part of the Company or any such holder of Senior Debt,
including, without limitation, any forbearance, waiver, consent, compromise,
amendment, extension, renewal, or taking or release of security of or in respect
of any Senior Debt or by noncompliance by the Company with the terms of such
subordination regardless of any knowledge thereof such holder may have or
otherwise be charged with.

          (g) Amendment or Waiver.  The provisions of this Section 1.10 may not
              -------------------                                              
be amended or waived in any manner which is detrimental to any Senior Debt
without the consent of the holders of all then existing Senior Debt.

                                       7
<PAGE>
 
          (h) Senior Debt Defined.  The term "Senior Debt" shall mean (i) all
              -------------------                                            
Indebtedness of the Company for money borrowed from banks or other institutional
lenders, including any extension or renewals thereof, whether outstanding on the
date hereof or thereafter created or incurred, which is not by its terms
subordinate and junior to or on a parity with the Notes and which is permitted
hereby at the time it is created or incurred, and (ii) all guaranties by the
Company which are not by their terms subordinate and junior to or on a parity
with the Notes and which are permitted hereby at the time they are made, of
Indebtedness of any Subsidiary if such Indebtedness would have been Senior Debt
pursuant to the provisions of clause (i) of this sentence had it been
Indebtedness of the Company.  In making any loans which are (or the guaranties
of which are) intended to be Senior Debt, the lenders or purchasers shall be
entitled to rely as to the fact that such Indebtedness or guaranty is permitted
hereby upon a certificate by the Company's chief financial officer purporting to
show such Indebtedness or guaranty will not result in the Company's failure to
comply with the provisions of Article IV hereof as of the date of the loan or
guarantee.

     1.11 Representations by the Purchasers; Legend.
          ----------------------------------------- 

          (a)  Representations by the Purchasers.  Each Purchaser (whether such
               ---------------------------------                               
Purchaser is a natural person, partnership, trust or employee benefit plan)
severally represents and warrants to the Company that:

               (i)  it was not organized for the specific purpose of acquiring
     the Notes or Warrants and that it, and each person who made this investment
     decision for the Purchaser, if such Purchaser is a trust or an employee
     benefit plan, is an "accredited investor" within the meaning of Rule 501
     under the Securities Act and;

               (ii) it has sufficient knowledge and experience in investing in
     companies similar to the Company in terms of the Company's stage of
     development so as to be able to evaluate the risks and merits of its
     investment in the Company and it is able financially to bear the risks
     thereof, including complete loss of its investment;

             (iii)  it has had an opportunity to discuss the Company's business,
     management and financial affairs with the Company's management and it has
     had the opportunity to ask questions and receive answers from officers and
     representatives of the Company concerning the terms and conditions of the
     transactions contemplated by this Agreement and obtain any additional
     information which the Company possesses or can acquire without unreasonable
     effort or expense that is necessary to verify the accuracy of information
     regarding the Company set forth herein or

                                       8
<PAGE>
 
     otherwise delivered to such Purchaser in connection with its purchase of
     Notes and Warrants;

               (iv) the Notes and Warrants being purchased by it are being
     acquired 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

               (v)  it understands that (1) the Notes and Warrants and the
     shares of Common Stock issuable upon exercise of the Warrants have not been
     registered under the Securities Act by reason of their issuance in a
     transaction exempt from the registration requirements of the Securities Act
     pursuant to Section 4(2) thereof or Rule 505 or 506 promulgated under the
     Securities Act, (2) the Notes and Warrants and, upon exercise thereof, the
     shares of Common Stock issued upon exercise of the Warrants must be held
     indefinitely unless a subsequent disposition thereof is registered under
     the Securities Act or is exempt from such registration, (3) the Notes and
     Warrants and the shares of Common Stock issued upon exercise of the
     Warrants will bear a legend to such effect and (4) the Company will make a
     notation on its transfer books to such effect.

          (b) Legend.  The Notes, the Warrants and any certificates for shares
               ------                                                          
of Common Stock issued upon exercise of the Warrants shall bear the following
legend or a legend substantially similar thereto:

          "The securities represented hereby have not been registered under the
     Securities Act of 1933.  These securities have been acquired for investment
     and not with a view to distribution or resale and may not be sold,
     mortgaged, pledged, hypothecated or otherwise transferred without an
     effective registration statement for such securities under the Securities
     Act of 1933, or an opinion of counsel reasonably satisfactory to the
     Company that registration is not required under such Act."

The Company hereby agrees that Messrs. Testa, Hurwitz & Thibeault shall be
deemed to be counsel reasonably satisfactory to the Company.

     1.12 Disclosure of Information by MCRC.  The Company understands that
          ---------------------------------                               
Massachusetts Capital Resource Company ("MCRC") is a special purpose limited
partnership organized under Chapter 109 of the General Laws of the Commonwealth
of Massachusetts and Chapter 816 of the Acts and Resolves of 1977 of the
Commonwealth of Massachusetts (the "Capital Resource Company Act"), and as such,
in accordance with such provisions, MCRC, in order to obtain certain benefits
for itself and its partners, is required to file

                                       9
<PAGE>
 
certain reports and otherwise disclose information relating to the business,
financial affairs, and future prospects of the Company and its affiliates (as
defined in the aforesaid legislation) with the Clerk of the Senate and the Clerk
of the House of Representatives of the General Court of the Commonwealth of
Massachusetts, the Secretary of Manpower Affairs, the Commissioner of Insurance
and the Department of Revenue of the Commonwealth of Massachusetts, and that
such reports and other information may constitute "public records" within the
purview of Section 7 of Chapter 4 of the General Laws of the Commonwealth of
Massachusetts.  In addition, information relating to the business, financial
affairs and future prospects of the Company and its affiliates must be disclosed
to others in order to obtain independent confirmation that financing on
substantially similar terms to financing provided pursuant to this Agreement was
not elsewhere available to the Company.  The Company hereby authorizes MCRC to
disclose all such information relating to the business, financial affairs and
future prospects of the Company and its affiliates as has been or may in the
future be presented to MCRC to all such persons as MCRC in good faith deems
necessary or appropriate in order to fulfill its obligations under the Capital
Resource Company Act.

                                   ARTICLE II

                      CONDITIONS TO PURCHASERS' OBLIGATION

     The obligation of the Purchasers to purchase and pay for the Notes and
Warrants at the Closing is subject to the following conditions:

     2.01 Representations and Warranties.  Each of the representations and
          ------------------------------                                  
warranties of the Company set forth in Article III hereof shall be true on the
date of the Closing.

     2.02 Documentation at Closing.  The Purchasers shall have received prior to
          ------------------------                                              
or at the Closing all of the following, each in form and substance satisfactory
to the Purchasers and their special counsel:

          (a) A certified copy of all charter documents of the Company; a
certified copy of the resolutions of the Board of Directors and, to the extent
required, the stockholders of the Company evidencing approval of this Agreement,
the Notes, the Warrants, the Registration Rights Amendment (as hereinafter
defined) and other matters contemplated hereby; a certified copy of the By-laws
of the Company; and certified copies of all documents evidencing other necessary
corporate or other action and governmental approvals, if any, with respect to
this Agreement, the Notes, the Warrants and the Registration Rights Amendment.

                                      10
<PAGE>
 
          (b) A favorable opinion of Messrs.  Foley, Hoag & Eliot, counsel for
the Company, as to matters set forth in Exhibit 2.02(b), and as to such other
                                        ---------------                      
matters as the Purchasers, or their special counsel, may reasonably request.

          (c) A certificate of the Secretary or an Assistant Secretary of the
Company which shall certify the names of the officers of the Company, authorized
to sign this Agreement, the Notes, the Warrants, the Registration Rights
Amendment and the other documents or certificates to be delivered pursuant to
this Agreement by the Company, or any of its officers, together with the true
signatures of such officers.  The Purchasers may conclusively rely on such
certificates until it shall receive a further certificate of the Secretary or an
Assistant Secretary of the Company cancelling or amending the prior certificate
and submitting the signatures of the officers named in such further certificate.

          (d) A certificate from a duly authorized officer of the Company
stating that: (i) the representations and warranties of the Company contained in
Article III hereof and otherwise made by the Company in writing in connection
with the transactions contemplated hereby are true and correct; (ii) the
transactions described in Section 2.03 have been consummated; and (iii) no
condition or event has occurred or is continuing or will result from execution
and delivery of this Agreement, the Notes, the Warrants or the Registration
Rights Amendment which constitute an Event of Default or would constitute an
Event of Default but for the requirement that notice be given or time elapse or
both.

          (e) A certificate, in the form attached as Exhibit 3.15 hereto, shall
                                                     ------------              
have been executed and delivered to MCRC by a duly authorized officer of the
Company.

          (f) Payment for the costs, expenses, taxes and filing fees identified
in Section 7.04 as to which the Purchasers give the Company notice prior to the
Closing.

     2.03 Other Transactions.  Prior to or simultaneous with the Closing:
          ------------------                                             

          (a) That certain Registration Rights Agreement, dated February 11,
1991 and as amended to date, shall have been amended (the "Registration Rights
Amendment") so as to provide that the Warrants and the shares of Common Stock
issued and issuable upon exercise of the Warrants shall be entitled to all of
the rights, benefits and obligations of said Registration Rights Agreement, said
Registration Rights Amendment to be substantially in the form of Exhibit 2.03(a)
                                                                 ---------------
hereto (said Registration Rights Agreement as so amended being herein referred
to as the "Registration Rights Agreement").

                                      11
<PAGE>
 
          (b) All rights of first refusal, including, without limitation, those
contained in Section 5.02 of that certain Series C Convertible Preferred Stock
Purchase Agreement, dated June 4, 1993, shall have been duly waived with respect
to the issuance of the Notes, the Warrants and the shares of Common Stock issued
or issuable upon exercise of the Warrants.

                                 ARTICLE III 

                        REPRESENTATIONS AND WARRANTIES

     The Company represents and warrants as follows:

     3.01 Organization and Standing of the Company.  The Company is a duly
          ----------------------------------------                        
organized and validly existing corporation in good standing under the laws of
the jurisdiction in which it was organized and has all requisite corporate power
and authority for the ownership and operation of its properties and for the
carrying on of its business as now conducted and as now proposed to be
conducted.  The Company is duly licensed or qualified and in good standing as a
foreign corporation authorized to do business in all jurisdictions wherein the
character of the property owned or leased, or the nature of the activities
conducted, by it makes such licensing or qualification necessary and where the
failure to be so licensed or qualified would have a material adverse effect on
the Company.  The Company has no Subsidiaries.

     3.02 Corporate Action.  The Company has all necessary corporate power and
          ----------------                                                    
has taken all corporate action required to make all the provisions of this
Agreement, the Notes, the Warrants, the Registration Rights Amendment and any
other agreements and instruments executed in connection herewith and therewith
the valid and enforceable obligations they purport to be. Sufficient shares of
authorized but unissued Common Stock of the Company have been reserved by
appropriate corporate action in connection with the prospective exercise of the
Warrants (assuming no adjustment in the number of shares of Common Stock
purchasable thereunder).  Neither the issuance of the Notes or Warrants, nor the
issuance of shares of Common Stock upon the exercise of the Warrants, is subject
to preemptive or other similar statutory or contractual rights and will not
conflict with any provisions of any agreement or instrument to which the Company
is a party or by which it is bound.

     3.03 Governmental Approvals.  Subject to the accuracy of the
          ----------------------                                 
representations and warranties of the Purchasers set forth in Section 1.11, and
other than exemptions available under federal and applicable state securities
laws and filings pursuant to federal and applicable state securities laws (all
of which filings have been made by the Company, other than those which are
required to be made after the Closing and which will be duly made on a timely
basis), including, with respect to the Registration Rights

                                      12
<PAGE>
 
Agreement, the registration of shares covered thereby with the Securities and
Exchange Commission, no authorization, consent, approval, license, exemption of
or filing or registration with any court or governmental department, commission,
board, bureau, agency or instrumentality, domestic or foreign, is or will be
necessary for, or in connection with, the offer, issuance, sale, execution or
delivery by the Company of, or for the performance by it of its obligations
under, this Agreement, the Notes, the Warrants or the Registration Rights
Amendment.

     3.04 Litigation.  Except as is set forth in Exhibit 3.04, there is no
          ----------                             ------------             
litigation or governmental proceeding or investigation pending or, to the best
of the knowledge of the Company, threatened against the Company affecting any of
its properties or assets, or against any officer, key employee or principal
stockholder of the Company where such litigation, proceeding or investigation,
either individually or in the aggregate, would have a material adverse effect on
the Company, nor, to the best of the knowledge of the Company, has there
occurred any event or does there exist any condition on the basis of which any
litigation, proceeding or investigation might properly be instituted.  Neither
the Company, nor, to the best of the knowledge of the Company, any officer or
key employee of the Company, or principal stockholder of the Company, is in
default with respect to any order, writ, injunction, decree, ruling or decision
of any court, commission, board or other government agency affecting the
Company.  There are no actions or proceedings pending or threatened (or any
basis therefor known to the Company) which might result, either in any case or
in the aggregate, in any material adverse change in the business, operations,
affairs or condition of the Company or in any of its properties or assets, or
which might call into question the validity of this Agreement, the Notes, the
Warrants, the Registration Rights Agreement or any action taken or to be taken
pursuant hereto or thereto.

     3.05 Compliance with Other Instruments.  The Company is in compliance in
          ---------------------------------                                  
all respects with the terms and provisions of this Agreement and of its charter
and by-laws and in all material respects with the terms and provisions of the
mortgages, indentures, leases, agreements and other instruments and of all
judgments, decrees, governmental orders, statutes, rules and regulations by
which it is bound or to which its properties or assets are subject, the failure
to comply with which would have a material adverse effect on the Company.
Neither the execution and delivery of this Agreement, the Notes, the Warrants or
the Registration Rights Amendment, nor the consummation of any transactions
contemplated hereby or thereby has constituted or resulted in or will constitute
or result in a default or violation of any term or provision in any of the
foregoing documents or instruments.  A schedule of Indebtedness of the Company
(including lease obligations required to be capitalized in accordance with

                                      13
<PAGE>
 
applicable Statements of Financial Accounting Standards) is attached as Exhibit
                                                                        -------
3.05.
- ---- 

     3.06 Federal Reserve Regulations.  The Company is not engaged in the
          ---------------------------                                    
business of extending credit for the purpose of purchasing or carrying margin
stock (within the meaning of Regulation G of the Board of Governors of the
Federal Reserve System), and no part of the proceeds of the Notes or Warrants
will be used to purchase or carry any margin security or to extend credit to
others for the purpose of purchasing or carrying any margin security or in any
other manner which would involve a violation of any of the regulations of the
Board of Governors of the Federal Reserve System.

     3.07 Title to Assets, Patents.  Except as is set forth in Exhibit 3.07, the
          ------------------------                             ------------     
Company has good and clear record and marketable title in fee to such of its
fixed assets as are real property, and good and merchantable title to, or the
valid right or license to use, all of its other assets, now carried on its books
including those reflected in the most recent balance sheet of the Company which
forms a part of Exhibit 3.08 attached hereto, or acquired since the date of such
                ------------                                                    
balance sheet (except personal property disposed of since said date in the
ordinary course of business) free of any mortgages, pledges, charges, liens,
security interests or other similar encumbrances.  The Company enjoys peaceful
and undisturbed possession under all leases under which it is operating, and all
said leases are valid and subsisting and in full force and effect.  The Company
owns or has a valid right to use the patents, patent rights, licenses, permits,
trade secrets, trademarks, trademark rights, trade names or trade name rights or
franchises, copyrights, inventions and intellectual property rights being used
to conduct its business as now operated and as now proposed to be operated; and
the conduct of its business as now operated and as now proposed to be operated
does not and will not conflict with valid patents, patent rights, licenses,
permits, trade secrets, trademarks, trademark rights, trade names or trade name
rights or franchises, copyrights, inventions and intellectual property rights of
others.  The Company has no obligation to compensate any Person for the use of
any such patents or such rights nor has the Company granted to any Person any
license or other rights to use in any manner any of such patents or such rights
of the Company, other than in the ordinary course of business or as set forth in
Exhibit 3.07.
- ------------ 

     3.08 Financial Information.  The financial statements of the Company
          ---------------------                                          
attached as Exhibit 3.08 present fairly the financial position of the Company as
            ------------                                                        
at the dates thereof and its results of operations for the periods covered
thereby and have been prepared in accordance with generally accepted accounting
principles consistently applied.  The financial statements so attached are: (1)
for the two years ended September 30, 1992 and September 30, 1993, certified by
Deloitte & Touche and (ii) for the eight-month

                                      14
<PAGE>
 
period ended May 31, 1994, being unaudited and subject to year-end adjustments
consisting of normal recurring items which will not be material in the aggregate
(except that such unaudited financial statements may not contain footnotes
required by generally accepted accounting principles).  The Company has no
liability contingent or otherwise not disclosed in the aforesaid financial
statements or in the notes thereto that could, together with all such other
liabilities, materially affect the financial condition of the Company, nor does
the Company have any reasonable grounds to know of any such liability.  Since
the date of said certified financial statements, (i) there has been no adverse
change in the business, assets or condition, financial or otherwise, operations
or prospects, of the Company; (ii) neither the business, condition, operations
or prospects of the Company nor any of its properties or assets has been
adversely affected as a result of any legislative or regulatory change (other
than those affecting businesses generally), any revocation or change in any
franchise, license or right to do business, or any other event or occurrence,
whether or not insured against; and (iii) the Company has not entered into any
material transaction or made any distribution on its capital stock.

     3.09 Taxes.  The Company has accurately prepared and timely filed all
          -----                                                           
federal, state and other tax returns required by law to be filed by it, and all
taxes shown to be due and all additional assessments have been paid or provision
made therefor.  The Company knows of no additional assessments or adjustments
pending or threatened against the Company for any period, nor of any basis for
any such assessment or adjustment.

     3.10 ERISA.  No employee benefit plan established or maintained, or to
          -----                                                            
which contributions have been made, by the Company, which is subject to part 3
of Subtitle B of Title I of The Employee Retirement Income Security Act of 1974,
as amended ("ERISA") had an accumulated funding deficiency (as such term is
defined in Section 302 of ERISA) as of the last day of the most recent fiscal
year of such plan ended prior to the date hereof, and no material liability to
the Pension Benefit Guaranty Corporation has been incurred with respect to any
such plan by the Company.

     3.11 Transactions with Affiliates.  Except as is set forth in Exhibit 3.11,
          ----------------------------                             ------------ 
there are no loans, leases, royalty agreements or other continuing transactions
between the Company and any Person owning five percent (5%) or more of any class
of capital stock of the Company or other entity controlled by such stockholder
or a member of such stockholder's family.

     3.12 Assumptions or Guaranties of Indebtedness of Other Persons.  The
          ----------------------------------------------------------      
Company has not assumed, guaranteed, endorsed or otherwise become directly or
contingently liable on (including, without limitation, liability by way of
agreement, contingent or

                                      15
<PAGE>
 
otherwise, to purchase, to provide funds for payment, to supply funds to or
otherwise invest in the debtor or otherwise to assure the creditor against loss)
any Indebtedness of any other Person.

     3.13 Investments in Other Persons.  Except as set forth in Exhibit 3.3, the
          ----------------------------                          -----------     
Company has not made any loan or advance to any Person which is outstanding on
the date of this Agreement, nor is the Company obligated or committed to make
any such loan or advance, nor does the Company own any capital stock or assets
comprising the business of, obligations of, or any interest in, any Person.

     3.14 Equal Employment Opportunity.  The Company has reviewed its employment
          ----------------------------                                          
practices and policies and, to the best of its knowledge, the Company is in full
compliance with (a) all applicable laws of the United States, of the
Commonwealth of Massachusetts and of each other applicable jurisdiction,
relating to equal employment opportunity (including, without limitation, Title
VII of the Civil Rights Act of 1964, as amended (42 U.S.C. (S)20OOe-17), the Age
Discrimination in Employment Act of 1967, as amended (29 U.S.C. (S)(S)621-634),
the Equal Pay Act of 1963 (29 U.S.C. (S)206(d)), and any rules, regulations and
administrative orders and Executive Orders relating thereto; Mass.  Gen.  Laws.
c. 151B, Mass.  Gen.  Laws c. 149 (S)24A et seq. and (S)105A et seq., and any
rules or regulations relating thereto; and (b) the applicable terms, relating to
equal employment opportunity, of any contract, agreement or grant the Company
has with, from, or relating (by way of subcontract or otherwise) to any other
contract, agreement or grant of, any federal or state governmental unit
("Government Contract"), including, without limitation, any terms required
pursuant to Federal Executive Order No. 11246 and Massachusetts Executive Order
No. 74 (both as amended).  To the best of the Company's knowledge, it has kept
all records required to be kept, and has filed all reports, affirmative action
plans and forms (including, without limitation and where applicable, Form EEO-1)
required to be filed pursuant to any such applicable law or the terms of any
such Government Contract.  The Company has not been subject to any adverse final
determination or order, with respect to any charge of employment discrimination
made against it, by the United States Equal Employment Opportunity Commission,
the Massachusetts Commission Against Discrimination or any other governmental
unit (including, without limitation, any such governmental unit with which it
has a Government Contract), and the Company is not presently, to the best of its
knowledge, subject to any formal proceedings before, or investigations by, such
commissions or governmental units.

     3.15 Status of Notes and Warrants as Qualified Investments.  The Company
          -----------------------------------------------------              
has duly authorized the execution and delivery to MCRC on behalf of the Company
of the certificate attached as Exhibit 3.15 hereto, setting forth such
                               ------------                           
statements, information and related data as are necessary to permit MCRC to
determine and

                                      16
<PAGE>
 
demonstrate that the Notes and Warrants issued pursuant to this Agreement will
constitute "qualified investments" within the meaning of that term as set forth
in the Capital Resource Company Act and that the full proceeds of the Notes and
Warrants will be used for purposes which will materially increase or maintain
equal opportunity employment in the Commonwealth of Massachusetts.  All such
statements, information and related data presented in such certificate as are
not based on estimates and projections of future events are true and correct as
of the date of such certificate and all such statements, information and related
data based upon estimates or projections of future events have been carefully
considered and prepared on behalf of the Company.

     3.16 Securities Act.  Neither the Company nor anyone acting on its behalf
          --------------                                                      
has offered any of the Notes, Warrants or similar securities, or solicited any
offers to purchase or made any attempt by preliminary conversation or
negotiations to dispose of the Notes, Warrants or similar securities, to any
Person other than the Purchasers or the institutions described in Exhibit 3.15.
                                                                  ------------  
Neither the Company nor anyone acting on its behalf has offered or will offer to
sell the Notes, Warrants or similar securities to, or solicit offers with
respect thereto from, or enter into any preliminary conversations or
negotiations relating thereto with, any Person, so as to bring the issuance and
sale of the Notes and Warrants under the registration provisions of the
Securities Act.

     3.17 Disclosure.  Neither this Agreement, the financial statements
          ----------                                                   
incorporated herein as Exhibit 3.08, the Certificate set forth as Exhibit 3.15
                       ------------                               ------------
hereof, nor any other agreement, document, certificate or written statement
furnished to the Purchasers or their special counsel by or on behalf of the
Company in connection with the transactions contemplated hereby contains any
untrue statement of a material fact or omits to state a material fact necessary
in order to make the statements contained herein or therein not misleading;
provided, however, that any estimates or projections of future events contained
in any business plan of the Company provided to any Purchaser represent only the
reasonable expectations and beliefs of the Company as of the date of such
business plan.

     3.18 No Brokers or Finders.  No Person has or will have, as a result of the
          ---------------------                                                 
transactions contemplated by this Agreement, any right, interest or valid claim
against or upon the Company for any commission, fee or other compensation as a
finder or broker because of any act or omission by the Company or any agent of
the Company.

     3.19 Other Agreements of Officers.  To the best of the knowledge of the
          ----------------------------                                      
Company, no officer or key employee of the Company is a party to or bound by any
agreement, contract or commitment, or subject to any restrictions, particularly
but without limitation in connection with any previous employment of

                                      17
<PAGE>
 
any such person, which materially and adversely affects, or in the future may
(so far as the Company can reasonably foresee) materially and adversely affect,
the business or operations of the Company or the right of any such person to
participate in the affairs of the Company.  To the best of the knowledge of the
Company, no officer or key employee has any present intention of terminating his
employment with the Company and the Company has no present intention of
terminating any such agreement.

     3.20 Capitalization; Status of Capital Stock.  The Company has a total
          ---------------------------------------                          
authorized capitalization consisting of: (i) 7,000,000 shares of Common Stock,
of which 3,249,115 shares are issued and outstanding; (ii) 630,516 shares of
Series A Convertible Preferred Stock, $.01 par value per share, all of which
shares are issued and outstanding; (iii) 620,000 shares of Series B Convertible
Preferred Stock, $.01 par value per share, all of which shares are issued and
outstanding; and (iv) 225,000 shares of Series C Convertible Preferred Stock,
$.01 par value per share, of which 200,789 shares are issued and outstanding.  A
complete list of the outstanding capital stock of the Company and the names in
which such capital stock is registered is set forth in Exhibit 3.20 hereto.  All
                                                       ------------             
the outstanding shares of capital stock of the Company have been duly
authorized, are validly issued and are fully paid and nonassessable.  The shares
of Common Stock issuable upon exercise of the Warrants, when so issued, will be
duly authorized, validly issued and fully paid and nonassessable.  Except as
otherwise indicated on Exhibit 3.20, there are no options, warrants or rights to
                       ------------                                             
purchase shares of capital stock or other securities of the Company authorized,
issued or outstanding, nor is the Company obligated in any other manner to issue
shares of its capital stock or other securities.  Except as is set forth in
Exhibit 3.20, there are no restrictions on the transfer of shares of capital
- ------------                                                                
stock of the Company other than those imposed by relevant state and federal
securities laws.  Except as is set forth in Exhibit 3.20, no holder of any
                                            ------------                  
security of the Company is entitled to preemptive or similar statutory or
contractual rights, either arising pursuant to any agreement or instrument to
which the Company is a party, or which are otherwise binding upon the Company.
Neither the issuance of the Notes or the Warrants nor the shares of Common Stock
issued upon exercise of the Warrants will result in an adjustment under the
antidilution or exercise rights of any holders of any outstanding shares of
capital stock options, warrants or other rights to acquire any securities of the
Company.  The offer and sale of all shares of capital stock and other securities
of the Company issued before the Closing complied with or were exempt from all
federal and state securities laws.

     3.21 Labor Relations.  To the best of the knowledge of the Company, no
          ---------------                                                  
labor union or any representative thereof has made any attempt to organize or
represent employees of the Company.  There are no unfair labor practice charges,
pending trials with respect to unfair labor practice charges, pending material
grievance

                                      18
<PAGE>
 
proceedings or adverse decisions of a Trial Examiner of the National Labor
Relations Board against the Company.  Furthermore, to the best of the knowledge
of the Company, relations with employees of the Company are good.

     3.22 Insurance.  The Company carries insurance covering its properties and
          ---------                                                            
business adequate and customary for the type and scope of the properties and
business, but in any event in amounts sufficient to prevent the Company from
becoming a co-insurer.

     3.23 Key Man Insurance.  The Company carries life insurance policies from
          -----------------                                                   
financially sound and reputable insurance companies on the lives of each of
Pamela D.A. Reeve and Michael A. Perfit, in the face amount of $1,000,000 each,
with the proceeds thereof being payable to the Company.

     3.24 Books and Records.  The books of account, ledgers, order books,
          -----------------                                              
records and documents of the Company accurately reflect all material information
relating to the business of the Company, the nature, acquisition, maintenance,
location and collection of the assets of the Company, and the nature of all
transactions giving rise to the obligations or accounts receivable of the
Company.

     3.25 Foreign Corrupt Practices Act.  The Company has reviewed its practices
          -----------------------------                                         
and policies and to the best of its knowledge and belief it is not engaged, nor
has any officer, director, employee or agent of the Company engaged, in any act
or practice which would constitute a violation of the Foreign Corrupt Practices
Act of 1977, or any rules or regulations promulgated thereunder.

     3.26 Registration Rights.  Other than pursuant to the Registration Rights
          -------------------                                                 
Agreement, no Person has demand or other rights to cause the Company to file any
registration statement under the Securities Act relating to any securities of
the Company or any right to participate in any such registration statement.

                                  ARTICLE IV

                           COVENANTS OF THE COMPANY

     4.01 Affirmative Covenants of the Company Other Than Reporting
          ---------------------------------------------------------
Requirements. Without limiting any other covenants and provisions hereof, the
- ------------
Company covenants and agrees that, as long as any of the Notes or Warrants are
outstanding, it will perform and observe the following covenants and provisions
and will cause each Subsidiary to perform and observe such of the following
covenants and provisions as are applicable to such Subsidiary:

          (a)  Punctual Payment.  Pay the principal of, premium, if any, and
               ----------------                                             
interest on each of the Notes at the times and place and in the manner provided
in the Notes and herein.

                                      19
<PAGE>
 
          (b) Payment of Taxes and Trade Debt.  Pay and discharge, and cause
              -------------------------------                               
each Subsidiary to pay and discharge, all taxes, assessments and governmental
charges or levies imposed upon it or upon its income or profits or business, or
upon any properties belonging to it, prior to the date on which penalties attach
thereto, and all lawful claims which, if unpaid, might become a lien or charge
upon any properties of the Company or any Subsidiary, provided that neither the
Company nor the Subsidiary shall be required to pay any such tax, assessment,
charge, levy or claim which is being contested in good faith and by appropriate
proceedings if the Company or Subsidiary concerned shall have set aside on its
books adequate reserves with respect thereto.  Pay and cause each Subsidiary to
pay, when due, or in conformity with customary trade terms, all lease
obligations, all trade debt, and all other Indebtedness incident to the
operations of the Company or its Subsidiaries, except such as are being
contested in good faith and by appropriate proceedings if the Company or
Subsidiary concerned shall have set aside on its books adequate reserves with
respect thereto.

          (c) Maintenance of Insurance.  Maintain, and cause each Subsidiary to
              ------------------------                                         
maintain, insurance with responsible and reputable insurance companies or
associations in such amounts and covering such risks as is usually carried by
companies engaged in similar businesses and owning similar properties in the
same general areas in which the Company or such Subsidiary operates, but in any
event in amounts sufficient to prevent the Company or such Subsidiary from
becoming a co-insurer.

          (d) Preservation of Corporate Existence.  Preserve and maintain, and
              -----------------------------------                             
cause each Subsidiary to preserve and maintain, its corporate existence, rights,
franchises and privileges in the jurisdiction of its incorporation, and qualify
and remain qualified, and cause each Subsidiary to qualify and remain qualified,
as a foreign corporation in each jurisdiction in which such qualification is
necessary or desirable in view of its business and operations or the ownership
of its properties; provided, however, that nothing herein contained shall
                   --------  -------                                     
prevent any merger, consolidation or transfer of assets permitted by subsection
4.02(e). Preserve and maintain, and cause each Subsidiary to preserve and
maintain, all licenses and other rights to use patents, processes, licenses,
trademarks, trade names, inventions, intellectual property rights or copyrights
owned or possessed by it and necessary to the conduct of its business.

          (e) Compliance with Laws.  Comply, and cause each Subsidiary to
              --------------------                                       
comply, with all applicable laws, rules, regulations and orders of any
governmental authority, noncompliance with which could materially adversely
affect its business or condition, financial or other.

                                      20
<PAGE>
 
          (f) Visitation Rights.  From time to time during normal business hours
              -----------------                                                 
and upon reasonable notice, permit any Purchaser or any agents or
representatives thereof, to examine and make copies of and extracts from the
records and books of account of, and visit and inspect the properties of, the
Company and any Subsidiary, and to discuss the affairs, finances and accounts of
the Company and any Subsidiary with any of their officers or directors and
independent accountants.

          (g) Keeping of Records and Books of Account.  Keep, and cause each
              ---------------------------------------                       
Subsidiary to keep, adequate records and books of account, in which complete
entries will be made in accordance with generally accepted accounting principles
consistently applied, reflecting all financial transactions of the Company and
such Subsidiary, and in which, for each fiscal year, all proper reserves for
depreciation, depletion, obsolescence, amortization, taxes, bad debts and other
purposes in connection with its business shall be made.

          (h) Maintenance of Properties, etc.  Maintain and preserve, and cause
              ------------------------------                                   
each Subsidiary to maintain and preserve, all of its properties, necessary or
useful in the proper conduct of its business, in good repair, working order and
condition, ordinary wear and tear excepted and except that the Company and any
Subsidiary may dispose of obsolete or worn out equipment and may replace
equipment with other similar equipment.

          (i) Compliance with ERISA.  Comply, and cause each Subsidiary to
              ---------------------                                       
comply, with all minimum funding requirements applicable to any pension or other
employee benefit or employee contribution plans which are subject to ERISA or to
the Internal Revenue Code of 1986, as amended (the "Code"), and comply, and
cause each Subsidiary to comply, in all other material respects with the
provisions of ERISA and the Code, and the rules and regulations thereunder,
which are applicable to any such plan.  Neither the Company nor any Subsidiary
will permit any event or condition to exist which could permit any such plan to
be terminated under circumstances which would cause the lien provided for in
Section 4068 of ERISA to attach to the assets of the Company or any Subsidiary.

          (j) Maintenance of Debt to Equity Ratio.  Maintain a ratio of
              -----------------------------------                      
Consolidated Indebtedness, less Indebtedness represented by the Notes, to
Consolidated Net Worth, plus Indebtedness represented by the Notes, of not more
than 2.0 to 1.0, such ratio to be measured at the end of each fiscal quarter of
the Company.

          (k) Interest Coverage.  Maintain a ratio of Consolidated Net Earnings
              -----------------                                                
Available for Interest Charges to Interest Charges of not less than 2.0 to 1.0,
such ratio to be measured at the end of each fiscal quarter of the Company as an
average of the four most recent fiscal quarters of the Company.

                                      21
<PAGE>
 
          (l) Foreign Corrupt Practices Act.  Comply, and cause each Subsidiary
              -----------------------------                                    
to comply, and cause each officer, director, employee and agent of the Company
and each Subsidiary to comply, at all times with the prohibitions on certain
acts and practices set forth in the Foreign Corrupt Practices Act Of 1977, and
any rules or regulations promulgated thereunder.

          (m) Equal Employment Opportunity.  Comply, and cause each Subsidiary
              ----------------------------                                    
to comply, with all applicable laws of the United States, the Commonwealth of
Massachusetts, and of each other applicable jurisdiction relating to equal
employment opportunity, any rules, regulations, administrative orders and
Executive Orders relating thereto and the applicable terms, relating to equal
employment opportunity, of any Government Contract; and keep, and cause each
Subsidiary to file, all reports, affirmative action plans and forms required to
be filed, pursuant to any such applicable law or the terms of any such
Government Contract; provided, however, the Company or any Subsidiary shall not
                     --------  -------                                         
be considered to have failed to comply with the foregoing during any period that
any matter relating to the Company's or such Subsidiary's employment practices
is being contested by the Company or such Subsidiary in appropriate proceedings,
or thereafter, if the Company or such Subsidiary complies with any final
determination issued in such proceedings.

          (n) Status of Notes and Warrants as Qualified Investments.  In the
              -----------------------------------------------------         
event that any of the statements, information and related data provided by or on
behalf of the Company or any Subsidiary and relied upon by MCRC in determining
that the Notes and Warrants constitute "qualified investments" within the
meaning of that term in the Capital Resource Company Act shall be put in issue
in any formal or informal proceedings initiated or conducted by or on behalf of
the Commonwealth of Massachusetts, the Company shall, upon reasonable notice and
at its expense, provide, and, cause each Subsidiary to provide, such additional
information, witnesses and related data as may be reasonably necessary or
appropriate to support the representations and warranties set forth in Article
III.

          (o) Key Man Life Insurance.  Maintain, with financially sound and
              ----------------------                                       
reputable insurance companies, term life insurance on the lives of each of
Pamela D.A. Reeve and Michael A. Perfit, in the amount of at least $1,000,000
each, which proceeds shall be payable to the order of the Company.  The Company
will not cause or permit any assignment of the proceeds of said policies, and
will not borrow against such policies.  The Company will add one designee of the
Purchasers as a notice party to each such policy, and will request that the
issuer of such policy provide such designee with ten (10) days' notice before
such policy is terminated (for failure to pay premium or otherwise) or assigned,
or before any change is made in the designation of the beneficiary thereof.

                                      22
<PAGE>
 
          (p) Attendance at Board Meetings.  The Company shall permit any
              ----------------------------                               
Purchaser or its designee to have one observer attend each meeting of its Board
of Directors and each meeting of any committee thereof.  The Company shall send
to each Purchaser and such designee the notice of the time and place of such
meeting in the same manner and at the same time as it shall send such notice to
its directors or committee members, as the case may be.  The Company shall also
provide to each Purchaser copies of all notices, reports, minutes and consents
at the time and in the manner as they are provided to the Board of Directors or
committee.

          (q) Compensation.  The Company shall pay to its management or
              ------------                                             
management of any Subsidiary compensation at a rate of compensation which is not
in excess of that commonly paid to management in companies of similar size, of
similar maturity and in similar businesses and all management compensation and
all policies relating thereto shall be approved in advance by a majority of the
members of that Company's Board of Directors.

     4.02 Negative Covenants of the Company.  Without limiting any other
          ---------------------------------                             
covenants and provisions hereof, the Company covenants and agrees that, as long
as any of the Notes or Warrants are outstanding, it will comply with and observe
the following covenants and provisions, and will cause each Subsidiary to comply
with and observe such of the following covenants and provisions as are
applicable to such Subsidiary, and will not:

          (a)  Liens.  Create, incur, assume or suffer to exist, or permit any
               -----                                                          
Subsidiary to create, incur, assume or suffer to exist, any mortgage, deed of
trust, pledge, lien, security interest or other charge or encumbrance (including
the lien or retained security title of a conditional vendor) of any nature, upon
or with respect to any of its properties, now owned or hereinafter acquired, or
assign or otherwise convey any right to receive income, except that the
foregoing restrictions shall not apply to mortgages, deeds of trust, pledges,
liens, security interests or other charges or encumbrances:

               (i)    for taxes, assessments or governmental charges or levies
     on property of the Company or any Subsidiary if the same shall not at the
     time be delinquent or thereafter can be paid without penalty, or are being
     contested in good faith and by appropriate proceedings;

               (ii)   imposed by law, such as carriers', warehousemen's and
     mechanics' liens and other similar liens arising in the ordinary course of
     business;

              (iii)   arising out of pledges or deposits under workmen's
     compensation laws, unemployment insurance, old age

                                      23
<PAGE>
 
     pensions, or other social security or retirement benefits, or similar
     legislation;

               (iv)   securing the performance of bids, tenders, contracts
     (other than for the repayment of borrowed money), statutory obligations and
     surety bonds;

               (v)    in the nature of zoning restrictions, easements and rights
     or restrictions of record on the use of real property which do not
     materially detract from its value or impair its use;

               (vi)   arising by operation of law in favor of the owner or
     sublessor of leased premises and confined to the property rented or arising
     out of any lease agreement relating to fixtures located on the premises so
     leased;

              (vii)   arising from any litigation or proceeding which is being
     contested in good faith by appropriate proceedings, provided, however, that
     no execution or levy has been made;

             (viii)   described in Exhibit 3.07 which secure the Indebtedness
                                   ------------
     set forth in Exhibit 3.05, provided that no such lien is extended to cover
                  ------------
     other or different property of the Company or any Subsidiary;

               (ix)   arising out of a capitalized lease or out of a purchase
     money mortgage or security interest on personal property to secure the
     purchase price of such property (or to secure Indebtedness incurred solely
     for the purpose of financing the acquisition of any such property),
     provided that such capitalized lease or purchase money mortgage or security
     interest does not extend to any other or different property of the Company
     or any Subsidiary; and

               (x)    granted to secure any Senior Debt.

          (b)  Indebtedness.  Create, incur, assume or suffer to exist, or 
               ------------
permit any Subsidiary to create, incur, assume or suffer to exist, any liability
with respect to Indebtedness except for:

               (i)    the Notes;

               (ii)   Indebtedness for money borrowed, provided that such
     Indebtedness for money borrowed does not result in the Company's failure to
     comply with all of the provisions of Article IV hereof;

              (iii)   Current Liabilities, other than for borrowed money, which
     are incurred in the ordinary course of business;

                                      24
<PAGE>
 
               (iv)   Indebtedness with respect to lease obligations, provided
     that such lease obligations do not violate subsection 4.02(c);

               (v)    the existing Indebtedness set forth in Exhibit 3.05; and
                                                             ------------     

               (vi)   Indebtedness referred to in subsection 4.02(a)(ix).

          (c)  Lease Obligations.  Create, incur, assume or suffer to exist, or
               -----------------                                               
permit any Subsidiary to create, incur, assume or suffer to exist, any
obligations as lessee for the rental or hire of real or personal property in
connection with any sale and leaseback transaction.

          (d)  Assumptions or Guaranties of Indebtedness of Other Persons.
               ----------------------------------------------------------  
Assume, guarantee, endorse or otherwise become directly or contingently liable
on, or permit any Subsidiary to assume, guarantee, endorse or otherwise become
directly or contingently liable on (including, without limitation, liability by
way of agreement, contingent or otherwise, to purchase, to provide funds for
payment, to supply funds to or otherwise invest in the debtor or otherwise to
assure the creditor against loss) any Indebtedness of any other Person, except
for guaranties by endorsement of negotiable instruments for deposit or
collection in the ordinary course of business.

          (e)  Mergers, Sale of Assets, etc.  Merge or consolidate with, or
               ----------------------------
sell, assign, lease or otherwise dispose of or voluntarily part with the control
of (whether in one transaction or in a series of transactions) a material
portion of its assets (whether now owned or hereinafter acquired) or sell,
assign or otherwise dispose of (whether in one transaction or in a series of
transactions) any of its accounts receivable (whether now in existence or
hereinafter created) at a discount or with recourse (which terms shall not
prohibit the grant of a security interest permitted by Section 4.02(a) of this
Agreement), to, any Person, or permit any Subsidiary to do any of the foregoing,
except for sales or other dispositions of assets in the ordinary course of
business and except that (1) any Subsidiary may merge into or consolidate with
or transfer assets to any other Subsidiary, (2) any Subsidiary may merge into or
transfer assets to the Company, and (3) the Company may merge any Person into it
or otherwise acquire such Person as long as the Company is the surviving entity,
such merger or acquisition does not result in the violation of any of the
provisions of this Agreement and no such violation exists at the time of such
merger or acquisition, and, provided that such merger or acquisition does not
result in the issuance (in one or more transactions) of shares of the voting
stock of the Company representing in the aggregate more than twenty percent
(20%) of the total outstanding voting stock of the

                                      25
<PAGE>
 
Company, on a fully diluted basis, immediately following the issuance thereof.

          (f)  Investments in Other Persons.  Make or permit any Subsidiary to
               ----------------------------                                   
make, any loan (which term shall not be deemed to include any operating account
maintained at any bank organized in the United States) or advance to any person,
or purchase, otherwise acquire, or permit any Subsidiary to purchase or
otherwise acquire, the capital stock, assets comprising the business of,
obligations of, or any interest in, any Person, except:

               (i)    investments by the Company or a Subsidiary in evidences of
     indebtedness issued or fully guaranteed by the United States of America and
     having a maturity of not more than one year from the date of acquisition;

              (ii)    investments by the Company or a Subsidiary in certificates
     of deposit, notes, acceptances and repurchase agreements having a maturity
     of not more than one year from the date of acquisition issued by a bank
     organized in the United States having capital, surplus and undivided
     profits of at least $100,000,000 and whose parent holding company, if any,
     has long-term debt rated Aal or higher, and whose commercial paper (if
     rated) is rated Prime 1, by Moody's Investors Service, Inc. or Silicon
     Valley Bank;

             (iii)    loans or advances from a Subsidiary to the Company;

              (iv)    investments by the Company or a Subsidiary in the highest-
     rated commercial paper having a maturity of not more than one year from the
     date of acquisition;

               (v)    investments by the Company or a Subsidiary in money market
     instruments or money market fund shares; provided that such instruments
     are, or such fund's investments consist principally in, the types of
     investments described in clauses (i), (ii) or (iv) of this subsection
     4.02(f); and

              (vi)    loans, advances and investments in any Subsidiary;
     provided that the aggregate amount of all such loans, advances and
     investments made in any fiscal year does not exceed $100,000.

          (g)  Distributions.  Declare or pay any dividends, purchase, redeem,
               -------------                                                  
retire, or otherwise acquire for value any of its capital stock (or rights,
options or warrants to purchase such shares) now or hereafter outstanding,
return any capital to its stockholders as such, or make any distribution of
assets to its stockholders as such, or permit any Subsidiary to do any of the

                                      26
<PAGE>
 
foregoing (such transactions being hereinafter referred to as "Distributions"),
                                                                               
except that the Subsidiaries may declare and make payment of cash and stock
- ------                                                                     
dividends, return capital and make distributions of assets to the Company;
provided, however, that nothing herein contained shall prevent the Company from:
- --------  -------                                                               

               (i)    effecting a stock split or declaring or paying any
     dividend consisting of shares of any class of capital stock to the holders
     of shares of such class of capital stock,

              (ii)    redeeming any stock of a deceased stockholder out of
     insurance held by the Company on that stockholder's life,

             (iii)    paying dividends with respect to shares of its Series A
     Convertible Preferred Stock, Series B Convertible Preferred Stock or Series
     C Convertible Preferred Stock, as authorized on the date hereof, at the
     time and pursuant to the terms and conditions of the Company's Certificate
     of Incorporation as in effect as of the date hereof, or

              (iv)    repurchasing shares of Common Stock owned by an employee
     or former employee, which shares are subject to an agreement under which
     the Company has the right to repurchase the same; provided, however, that
     the purchase price shall not exceed the purchase price paid to the Company
     for the purchase of such shares of Common Stock,

if in the case of any such transaction there does not exist at the time of such
Distribution an Event of Default or an event which, but for the requirement that
notice be given or time elapse or both, would constitute an Event of Default and
provided that such Distribution can be made in compliance with the other terms
of this Agreement.

          (h)  Dealings with Affiliates.  Except as is set forth in Exhibit
               ------------------------                             -------
3.11, enter or permit ny Subsidiary to enter into any transaction with any
- ----
holder of 5% or more of any class of capital stock of the Company, or any member
of their families or any corporation or other entity in which any one or more of
such stockholders or members of their immediate families directly or indirectly
holds five percent (5%) or more of any class of capital stock except in the
ordinary course of business and on terms not less favorable to the Company or
the Subsidiary than it would obtain in a transaction between unrelated parties.

          (i)  Maintenance of Ownership of Subsidiaries.  Sell or otherwise
               ----------------------------------------                    
dispose of any shares of capital stock of any Subsidiary, except to the Company
or another Subsidiary, or permit any Subsidiary to issue, sell or otherwise
dispose of any shares of its capital stock or the capital stock of any
Subsidiary,

                                      27
<PAGE>
 
except to the Company or another Subsidiary, provided, however, that nothing
                                             --------  -------              
herein contained shall prevent any merger, consolidation or transfer of assets
permitted by subsection 4.02(e).

          (j)  Change in Nature of Business.  Make, or permit any Subsidiary to
               ----------------------------                                    
make, any material change in the nature of its business as carried on at the
date hereof.

     4.03 Reporting Requirements.  The Company will furnish to each registered
          ----------------------                                              
holder of any Note, any Warrant or any Common Stock issued upon exercise of any
Warrant:

          (a)  as soon as possible and in any event within five (5) days after
the occurrence of each Event of Default or each event which, with the giving of
notice or lapse of time or both, would constitute an Event of Default, the
statement of the chief financial officer of the Company setting forth details of
such Event of Default or event and the action which the Company proposes to take
with respect thereto;

          (b)  as soon as available and in any event within thirty (30) days
after the end of each month in each fiscal year of the Company (other than the
last month in each fiscal year and the last month in each fiscal quarter),
consolidated and consolidating balance sheets of the Company and its
Subsidiaries as of the end of such month and consolidated and consolidating
statements of income and retained earnings and of changes in financial position
of the Company and its Subsidiaries for the period commencing at the end of the
previous fiscal year and ending with the end of such month, setting forth in
each case (except for the statement of changes in financial position) in
comparative form the corresponding figures for the corresponding period of the
preceding fiscal year, all in reasonable detail and duly certified (subject to
year-end audit adjustments) by the chief financial officer of the Company as
having been prepared in accordance with generally accepted accounting principles
consistently applied (except that such unaudited financial statements need not
contain footnotes required by generally accepted accounting principles);

          (c)  as soon as available and in any event within forty five (45) days
after the end of each of the first three quarters of each fiscal year of the
Company, consolidated and consolidating balance sheets of the Company and its
Subsidiaries as of the end of such quarter and consolidated and consolidating
statements of income and retained earnings and of changes in financial position
of the Company and its Subsidiaries for the period commencing at the end of the
previous fiscal year and ending with the end of such quarter, setting forth in
each case (except for the statement of changes in financial position) in
comparative form the corresponding figures for the corresponding period of the
preceding fiscal year, all in reasonable detail and duly certified

                                      28
<PAGE>
 
(subject to year-end audit adjustments) by the chief financial officer of the
Company as having been prepared in accordance with generally accepted accounting
principles consistently applied (except that such unaudited financial statements
need not contain footnotes required by generally accepted accounting
principles);

          (d)  as soon as available and in any event within ninety (90) days
after the end of each fiscal year of the Company, a copy of the annual audit
report for such year for the Company and its Subsidiaries, including therein
consolidated and consolidating balance sheets of the Company and its
Subsidiaries as of the end of such fiscal year and consolidated and
consolidating statements of income and retained earnings and of changes in
financial position of the Company and its Subsidiaries for such fiscal year,
setting forth in each case in comparative form the corresponding figures for the
preceding fiscal year, all duly certified by independent public accountants of
recognized standing acceptable to the Purchasers;

          (e)  at the time of delivery of each monthly, quarterly and annual
statement, a certificate, executed by the chief financial officer in the case of
monthly and quarterly statements and the Company's independent public
accountants in the case of annual statements, stating that such officer or
accountants, as the case may be, has caused this Agreement, the Notes, and the
Warrants to be reviewed and has no knowledge of any default by the Company or
any Subsidiary in the performance or observance of any of the provisions of this
Agreement, the Notes or the Warrants or, if such officer or accountant has such
knowledge, specifying such default and the nature thereof.  Each such
certificate shall set forth computations in reasonable detail demonstrating
compliance with the provisions of subsections 4.01(j) and (k) and subsections
4.02(b) and (c);

          (f)  promptly upon receipt thereof, any written report submitted to
the Company by independent public accountants in connection with an annual or
interim audit of the books of the Company and its Subsidiaries made by such
accountants;

          (g)  prior to the start of each fiscal year, consolidated capital and
operating expense budgets, cash flow projections and income and loss projections
for the Company and its Subsidiaries in respect of such fiscal year, all
itemized in reasonable detail and prepared on a monthly basis, and, promptly
after preparation, any revisions to any of the foregoing;

          (h)  promptly after the commencement thereof, notice of all actions,
suits and proceedings before any court or governmental department, commission,
board, bureau, agency or instrumentality, domestic or foreign, affecting the
Company or any Subsidiary of the type described in Section 3.04; and

                                      29
<PAGE>
 
          (i)  promptly after sending, making available, or filing the same,
such reports and financial statements as the Company or any Subsidiary shall
send or make available to the stockholders of the Company or the Securities and
Exchange Commission and, except as prohibited by law, such other information
respecting the business, properties or the condition or operations, financial or
otherwise, of the Company or any of its Subsidiaries as any Purchaser may from
time to time reasonably request.

     4.04 Termination of Certain Covenants of the Company.  The covenants set
          -----------------------------------------------                    
forth in subsections 4.01(a), (j) and (k) and in subsections 4.02(a), (b) and
(c) shall terminate and be of no further force or effect when the Notes have
been redeemed in their entirety.  All other covenants set forth in Sections
4.01, 4.02 and 4.03 shall terminate and be of no further force or effect upon
the later of (i) such time as the Notes have been redeemed in their entirety and
the Warrants have expired and/or been exercised in their entirety and (ii) when
the Company shall be subject to the reporting requirements of the Securities
Exchange Act of 1934, or any similar federal statute.

                                   ARTICLE V

                               EVENTS OF DEFAULT

     5.01 Events of Default.  If any of the following events ("Events of
          -----------------                                             
Default") shall occur and be continuing:

          (a)  The Company shall fail to pay any installment of principal of or
interest or premium on any of the Notes when due; or

          (b)  The Company shall default in the performance of any covenant
contained in subsections 4.01(j) or (k) or shall default for ten (10) days in
the performance of any covenant contained in Section 4.02; or

          (c)  Any representation or warranty made by the Company or any
Subsidiary in this Agreement or by the Company or any Subsidiary (or any
officers of the Company or any Subsidiary) in any certificate, instrument or
written statement contemplated by or made or delivered pursuant to or in
connection with this Agreement, shall prove to have been incorrect when made in
any material respect; or

          (d)  The Company or any Subsidiary shall fail to perform or observe
any other term, covenant or agreement contained in this Agreement, the Notes,
the Warrants or the Registration Rights Agreement on its part to be performed or
observed and any such failure remains unremedied for ten (10) business days
after written notice thereof shall have been given to the Company by any
registered holder of the Notes; or

                                      30
<PAGE>
 
          (e)  The Company or any Subsidiary shall fail to pay any Indebtedness
for borrowed money (other than as evidenced by the Notes) owing by the Company
or such Subsidiary (as the case may be), or any interest or premium thereon,
when due (or, if permitted by the terms of the relevant document, within any
applicable grace period), whether such Indebtedness shall become due by
scheduled maturity, by required prepayment, by acceleration, by demand or
otherwise, or shall fail to perform any term, covenant or agreement on its part
to be performed under any agreement or instrument (other than this Agreement or
the Notes) evidencing or securing or relating to any Indebtedness owing by the
Company or any Subsidiary, as the case may be, when required to be performed
(or, if permitted by the terms of the relevant document, within any applicable
grace period), if the effect of such failure to pay or perform is to accelerate,
or to permit the holder or holders of such Indebtedness, or the trustee or
trustees under any such agreement or instrument to accelerate, the maturity of
such Indebtedness, unless such failure to pay or perform shall be waived by the
holder or holders of such Indebtedness or such trustee or trustees, or, if
permitted by the applicable documents, cured by the Company or Subsidiary; or

          (f)  The Company or any Subsidiary shall be involved in financial
difficulties as evidenced (i) by its admitting in writing its inability to pay
its debts generally as they become due; (ii) by its commencement of a voluntary
case under Title 11 of the United States Code as from time to time in effect, or
by its authorizing, by appropriate proceedings of its Board of Directors or
other governing body, the commencement of such a voluntary case; (iii) by its
filing an answer or other pleading admitting or failing to deny the material
allegations of a petition filed against it commencing an involuntary case under
said Title 11, or seeking, consenting to or acquiescing in the relief therein
provided, or by its failing to controvert timely the material allegations of any
such petition; (iv) by the entry of an order for relief in any involuntary case
commenced under said Title 11; (v) by its seeking relief as a debtor under any
applicable law, other than said Title 11, of any jurisdiction relating to the
liquidation or reorganization of debtors or to the modification or alteration of
the rights of creditors, or by its consenting to or acquiescing in such relief;
(vi) by the entry of an order by a court of competent jurisdiction (a) finding
it to be bankrupt or insolvent, (b) ordering or approving its liquidation,
reorganization or any modification or alteration of the rights of its creditors,
or (c) assuming custody of, or appointing a receiver or other custodian for, all
or a substantial part of its property; or (vii) by its making an assignment for
the benefit of, or entering into a composition with, its creditors, or
appointing or consenting to the appointment of a receiver or other custodian for
all or a substantial part of its property; or

                                      31
<PAGE>
 
          (g)  Any judgment, writ, warrant of attachment or execution or similar
process shall be issued or levied against a substantial part of the property of
the Company or any Subsidiary and such judgment, writ, or similar process shall
not be released, vacated or fully bonded within sixty (60) days after its issue
or levy;

then, and in any such event, any Purchaser or any other holder of the Notes may,
by notice to the Company, declare the entire unpaid principal amount of the
Notes, all interest accrued and unpaid thereon and all other amounts payable
under this Agreement to be forthwith due and payable, whereupon the Notes, all
such accrued interest and all such amounts shall become and be forthwith due and
payable (unless there shall have occurred an Event of Default under subsection
5.01(f) in which case all such amounts shall automatically become due and
payable), without presentment, demand, protest or further notice of any kind,
all of which are hereby expressly waived by the Company.

     5.02 Annulment of Defaults.  Section 5.01 is subject to the condition that,
          ---------------------                                                 
if at any time after the principal of any of the Notes shall have become due and
payable, and before any judgment or decree for the payment of the moneys so due,
or any thereof, shall have been entered, all arrears of interest upon all the
Notes and all other sums payable under the Notes and under this Agreement
(except the principal of the Notes which by such declaration shall have become
payable) shall have been duly paid, and every other Event of Default shall have
been made good or cured, then and in every such case the holders of seventy-five
percent (75%) or more in principal amount of all Notes then outstanding may, by
written instrument filed with the Company, rescind and annul such declaration
and its consequences; but no such rescission or annulment shall extend to or
affect any subsequent default or Event of Default or impair any right consequent
thereon.

                                  ARTICLE VI

                       DEFINITIONS AND ACCOUNTING TERMS

     6.01 Certain Defined Terms.  As used in this Agreement, the following terms
          ---------------------                                                 
shall have the following meanings (such meanings to be equally applicable to
both the singular and plural forms of the terms defined):

     "Agreement" means this Subordinated Note and Warrant Purchase Agreement as
from time to time amended and in effect between the parties.

     "Capital Resource Company Act" shall have the meaning assigned to that term
in Section 1.12.

                                      32
<PAGE>
 
     "Code" shall have the meaning assigned to that term in Section 4.01(i).

     "Company" means and shall include Credit Technologies, Inc. and its
successors and assigns.

     "Common Stock" includes the Company's Common Stock, $.01 par value per
share, as authorized on the date of this Agreement and any other securities into
which or for which such Common Stock may be converted or exchanged pursuant to a
plan of recapitalization, reorganization, merger, sale of assets or otherwise.

     "Consolidated" and "consolidating" when used with reference to any term
defined herein mean that term as applied to the accounts of the Company and its
Subsidiaries consolidated in accordance with generally accepted accounting
principles.

     "Consolidated Net Earnings Available for Interest Charges" means, for any
period, Consolidated Net Income for such period plus (a) interest paid or
accrued by the Company and its Subsidiaries with respect to all Indebtedness for
such period and (b) income and excess profit taxes for such period and all other
taxes for such period which are imposed on or measured by income after deduction
of interest charges.

     "Consolidated Net Income" means, for any period, the net income (or net
deficit) of the Company and its Subsidiaries for such period, after all
expenses, taxes and other proper charges, determined in accordance with
generally accepted accounting principles eliminating (i) all intercompany items,
(ii) all earnings attributable to equity interests in Persons that are not
Subsidiaries unless actually received by the Company or its Subsidiaries, (iii)
all income arising from the forgiveness, adjustment or negotiated settlement of
any Indebtedness, and (iv) any increase or decrease of income arising from any
change in the method of accounting for any item from that employed in the
preparation of the financial statements attached hereto as Exhibit 3.08.
                                                           ------------ 

     "Consolidated Net Worth" means, at any dates, the sum of (a) the par value
of all of the stock of the Company issued and outstanding, (b) the amount of any
additional paid-in-capital and (c)

               (i)  the positive retained earnings, if any, of the Company and
     its Subsidiaries, or

               (ii)  less, the amount of any deficit in the retained earnings of
     the Company and its Subsidiaries

as the same appears on a consolidated balance sheet of the Company and its
Subsidiaries prepared in accordance with generally

                                      33
<PAGE>
 
accepted accounting principles consistently applied as of such date, after
eliminating all intercompany items and all amounts properly attributable to (1)
any write-up in the book value of any asset resulting from a revaluation thereof
after the date of this Agreement; (2) the amount of any intangible assets
including patents, trademarks, unamortized debt discount and expense, goodwill,
covenants and agreements and the excess of the purchase price paid for assets or
stock acquired over the value assigned thereto on the books of the Company or of
the Subsidiary which shall have acquired the same; (3) earnings attributable to
any other Person unless actually received by the Company or its Subsidiaries;
and (4) changes in the method of accounting.

     "Current Liabilities" means all liabilities of any corporation which would,
in accordance with generally accepted accounting principles consistently
applied, be classified as current liabilities of a corporation conducting a
business the same as or similar to that of such corporation, including, without
limitation, all rental payments due under leases required to be capitalized in
accordance with applicable Statements of Financial Accounting Standards and
fixed prepayments of, and sinking fund payments with respect to, Indebtedness
(including Indebtedness evidenced by the Notes), which payments are required to
be made within one year from the date of determination.

     "Distribution" shall have the meaning assigned to that term in Section
4.02(g).

     "ERISA" shall have the meaning assigned to that term in Section 3.10.

     "Events of Default" shall have the meaning assigned to that term in Section
5.01.

     "Government Contract" shall have the meaning assigned to that in Section
3.14.

     "Indebtedness" means all obligations, contingent and otherwise, which
should, in accordance with generally accepted accounting principles consistently
applied, be classified upon the obligor's balance sheet as liabilities, but in
any event including, without limitation, liabilities secured by any mortgage on
property owned or acquired subject to such mortgage, whether or not the
liability secured thereby shall have been assumed, and also including, without
limitation, (i) all guaranties, endorsements and other contingent obligations,
in respect of Indebtedness of others, whether or not the same are or should be
so reflected in said balance sheet, except guaranties by endorsement of
negotiable instruments for deposit or collection or similar transactions in the
ordinary course of business and (ii) the present value of any lease payments due
under leases required to be capitalized in accordance with applicable Statements
of

                                      34
<PAGE>
 
Financial Accounting Standards, determined in accordance with applicable
Statements of Financial Accounting Standards.

     "Interest Charges" means the interest expense of the Company and its
Subsidiaries on Indebtedness (including the current portion thereof).

     "MCRC" shall have the meaning assigned to that term in Section 1.12.

     "Notes" shall have the meaning assigned to that term in Section 1.01.

     "Person" means an individual, corporation, partnership, joint venture,
trust, or unincorporated organization, or a government or any agency or
political subdivision thereof.

     "Purchaser" or "Purchasers" means and shall include not only the Purchasers
listed in the Schedule of Purchasers attached hereto but also any other holder
or holders of any of the Notes or Warrants.

     "Registration Rights Agreement" shall have the meaning assigned to that
term in Section 2.03(a).

     "Registration Rights Amendment" shall have the meaning assigned to that
term in Section 2.03(a).

     "Securities Act" means the Securities Act of 1933 or any similar Federal
statute, and the rules and regulations of the Securities and Exchange Commission
(or of any other Federal agency then administering the Securities Act)
thereunder, all as the same shall be in effect at the time.

     "Senior Debt" shall have the meaning assigned to that term in Section
1.10(h).

     "Subsidiary" or "Subsidiaries" means any corporation or trust of which the
Company and/or any of its other Subsidiaries (as herein defined) directly or
indirectly owns more than fifty percent (50%) outstanding stock having ordinary
voting power to elect a majority of the Board of Directors of such corporation
or trust.

     "Warrants" shall have the meaning assigned to that term in Section 1.02.

     6.02 Accounting Terms.  All accounting terms not specifically defined
          ----------------                                                
herein shall be construed in accordance with generally accepted accounting
principles consistent with those applied in preparation of the financial
statements attached hereto as Exhibit 3.08, and all financial data submitted
                              ------------                                  
pursuant to this Agreement

                                      35
<PAGE>
 
and all financial tests to be calculated in accordance with this Agreement shall
be prepared and calculated in accordance with such principles.

                                  ARTICLE VII

                                 MISCELLANEOUS

     7.01 No Waiver; Cumulative Remedies.  No failure or delay on the part of
          ------------------------------                                     
the Purchasers, or any other holder of the Notes or Warrants in exercising any
right, power or remedy hereunder shall operate as a waiver thereof; nor shall
any single or partial exercise of any such right, power or remedy preclude any
other or further exercise thereof or the exercise of any other right, power or
remedy hereunder.  The remedies herein provided are cumulative and not exclusive
of any remedies provided by law.

     7.02 Amendments, Waivers and Consents.  Any provision in this Agreement,
          --------------------------------                                   
the Notes or the Warrants to the contrary notwithstanding, changes in or
additions to this Agreement may be made, and compliance with any covenant or
provision herein or therein set forth may be omitted or waived, if the Company
(i) shall, in the case of the Notes, obtain consent thereto in writing from the
holder or holders of at least seventy-five percent (75%) in principal amount of
all Notes then outstanding, and (ii) shall, in the case of the Warrants, obtain
the consent thereto in writing from the holder or holders of at least seventy-
five percent (75%) of the Common Stock issued and issuable upon exercise of the
Warrants; provided that no such consent shall be effective to reduce or to
          --------                                                        
postpone the date fixed for the payment of the principal (including any required
redemption) or interest payable on any Note, without the consent of the holder
thereof, or to reduce the percentage of the Notes and Warrants the consent of
the holders of which is required under this Section.  Any waiver or consent may
be given subject to satisfaction of conditions stated therein and any waiver or
consent shall be effective only in the specific instance and for the specific
purpose for which given.  Written notice of any waiver or consent effected under
this subsection shall promptly be delivered by the Company to any holders who
did not execute the same.

     7.03 Addresses for Notices, etc.  All notices, requests, demands and other
          --------------------------                                           
communications provided for hereunder shall be in writing (including telegraphic
communication) and mailed, telegraphed, sent by facsimile or delivered to the
applicable party at the addresses indicated below:

                                      36
<PAGE>
 
     If to the Company:

               Credit Technologies, Inc.
               281 Winter Street
               Waltham, Massachusetts 02154
               Attention: President

     with a copy to:

               John D. Patterson, Jr., Esq.
               Foley, Hoag & Eliot
               One Post Office Square
               Boston, Massachusetts 02109

     If to any Purchaser:

               At such Purchaser's address as listed in
               the Schedule of Purchasers attached hereto

     If to any other holder of the Notes or Warrants:  at such holder's address
for notice as set forth in the register maintained by the Company, or, as to
each of the foregoing, at such other address as shall be designated by such
Person in a written notice to the other party complying as to delivery with the
terms of this Section.  All such notices, requests, demands and other
communications shall, when mailed, sent by facsimile or telegraphed,
respectively, be effective five (5) days from when deposited in the mails or
delivered to the telegraph company, respectively, addressed as aforesaid.

     7.04 Costs, Expenses and Taxes.  The Company agrees to pay on demand all
          -------------------------                                        
reasonable costs and expenses of the Purchasers in connection with the
preparation, execution and delivery of this Agreement, the Notes, the Warrants,
the Registration Rights Amendment and other instruments and documents to be
delivered hereunder, including the reasonable fees and out-of-pocket expenses of
Messrs. Testa, Hurwitz & Thibeault, special counsel for the Purchasers, with
respect thereto, as well as the reasonable fees and out-of-pocket expenses of
legal counsel, independent public accountants and other outside experts
reasonably retained by the Purchasers in connection with the amendment or
enforcement of this Agreement, the Notes, the Warrants, the Registration Rights
Agreement and other instruments and documents to be delivered hereunder or
thereunder.  In addition, the Company shall pay any and all stamp and other
taxes payable or determined to be payable in connection with the execution and
delivery of this Agreement, the Notes, the Warrants and the other instruments
and documents to be delivered hereunder or thereunder and agrees to save the
Purchasers harmless from and against any and all liabilities with respect to or
resulting from any delay in paying or omission to pay such taxes and filing
fees.

                                      37
<PAGE>
 
     7.05 Binding Effect; Assignment.  This Agreement shall be binding upon
          --------------------------                                       
and inure to the benefit of the Company and the Purchasers and their respective
successors and assigns, except that the Company shall not have the right to
assign its rights hereunder or any interest herein without the prior written
consent of the Purchasers.

     7.06 Survival of Representations and Warranties.  All representations and
          ------------------------------------------                          
warranties made in this Agreement, the Notes, the Warrants or any other
instrument or document delivered in connection herewith or therewith, shall
survive the execution and delivery hereof or thereof and the making of the
loans.

     7.07 Prior Agreements.  This Agreement constitutes the entire agreement
          ----------------                                                  
between the parties and supersedes any prior understandings or agreements
concerning the subject matter hereof.

     7.08 Severability. The invalidity or unenforceability of any provision
          ------------                                                     
hereof shall in no way affect the validity or enforceability of any other
provision.

     7.09 Governing Law.  This Agreement shall be governed by, and construed in
          -------------                                                        
accordance with, the laws of the Commonwealth of Massachusetts.

     7.10 Headings.  Article, Section and subsection headings in this Agreement
          --------                                                             
are included herein for convenience of reference only and shall not constitute a
part of this Agreement for any other purpose.

     7.11 Sealed Instrument.  This Agreement is executed as an instrument under
          -----------------                                                    
seal.

     7.12 Counterparts.  This Agreement may be executed in any number of
          ------------                                                  
counterparts, all of which taken together shall constitute one and the same
instrument, and each of the parties hereto may execute this Agreement by signing
any such counterpart.

     7.13 Further Assurances.  From and after the date of this Agreement, upon
          ------------------                                                  
the request of any Purchaser, the Company and each Subsidiary shall execute and
deliver such instruments, documents and other writings as may be necessary or
desirable to confirm and carry out and to effectuate fully the intent and
purposes of this Agreement, the Notes and the Warrants.

     7.14 Acknowledgment. The Company and each Purchaser hereby acknowledge that
          --------------                                                        
the Purchasers, other than MCRC, would not have provided to the Company the
financing being provided hereunder on the terms agreed to herein had not MCRC
agreed to participate for the amount and on the terms agreed to herein.

                                      38
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their respective officers thereunto duly authorized, as of the date
first above written.

                         CREDIT TECHNOLOGIES, INC.


                         By /s/ Pamela D.A. Reeve
                           --------------------------------------
                            Pamela D.A. Reeve, President

                         MASSACHUSETTS CAPITAL RESOURCE COMPANY


                         By /s/ Joan C. McArdle
                           --------------------------------------
                              Joan C. McArdle, Vice President

                         D. QUINN MILLS, AS CUSTODIAN FOR
                              SHIRLEY E. MILLS UNDER THE 
                              MASSACHUSETTS UNIFORM TRANSFERS TO 
                              MINORS ACT


                         By /s/ D. Quinn Mills
                           --------------------------------------
                              D. Quinn Mills, Custodian

                                      39
<PAGE>
 
                           CREDIT TECHNOLOGIES, INC.

                            Schedule of Purchasers
                            ----------------------

<TABLE>
<CAPTION>
                                         Number of      Total
                           Principal     Shares of    Aggregate
      Name and               Amount    Common Stock    Purchase
Address of Purchaser        Of Notes   Under Warrant    Price
- --------------------       ----------  -------------  ----------
<S>                        <C>         <C>            <C>
Massachusetts Capital      $2,000,000     250,000     $2,000,000
Resource Company*
420 Boylston Street
Boston, MA  02116
 
D. Quinn Mills, As            100,000      12,500        100,000
Custodian for
Shirley E. Mills
Under the Massachusetts
Uniform Transfers to
Minors Act
7 Central Street
Winchester, MA 01893       
                           ----------     -------     ----------
    TOTAL                  $2,100,000     262,500     $2,100,000
                           ----------     -------     ----------
</TABLE>



______________

*Payments to MCRC should be made to:

     Massachusetts Capital Resource Company
     P.O. Box 3707
     Boston, Massachusetts 02241

                                      40
<PAGE>
 

     The securities represented hereby have not been registered under the
Securities Act of 1933.  These securities have been acquired for investment and
not with a view to distribution or resale, and may not be sold, mortgaged,
pledged, hypothecated or otherwise transferred without an effective registration
statement for such securities under the Securities Act of 1933, or an opinion of
counsel reasonably satisfactory to the Company that registration is not required
under such act.

     This instrument is subject to a certain Subordination Agreement, dated as
of August 29, 1994, by and among the holder, Silicon Valley Bank and certain
other parties.


                           CREDIT TECHNOLOGIES, INC.

                          SUBORDINATED NOTE DUE 2001

$  [  ]                                                       August 29, 1994

     For value received, Credit Technologies, Inc., a Delaware corporation (the
"Company"), hereby promises to pay to [ name ] or registered assigns
(hereinafter referred to as the "Payee"), on or before June 30, 2001, the
principal sum of [ amount ] Dollars ($ [ amt ]) or such part thereof as then
remains unpaid, to pay interest from the date hereof on the whole amount of said
principal sum remaining from time to time unpaid at the rate of eight percent
(8%) per annum, such interest to be payable quarterly on the last day of March,
June, September and December in each year, the first such payment to be due and
payable on September 30, 1994, until the whole amount of the principal hereof
remaining unpaid shall become due and payable, and to pay interest at the rate
of fourteen percent (14%) (so far as the same may be legally enforceable) on all
overdue principal (including any overdue required redemption), premium and
interest. Principal, premium, if any, and interest shall be payable in lawful
money of the United States of America, in immediately available funds, at the
principal office of the Payee or at such other place as the legal holder may
designate from time to time in writing to the Company. Interest shall be
computed on the basis of a 360-day year and a 30-day month.

     This Note is issued pursuant to and is entitled to the benefits of a
certain Subordinated Note and Warrant Purchase Agreement, dated as of August 29,
1994, between the Company and the Persons listed on the Schedule of Purchasers
attached thereto (as the same may be amended from time to time, hereinafter
referred to as the "Agreement"), and each holder of this Note, by his acceptance
hereof, agrees to be bound by the provisions of the Agreement, including,
without 

                                      45
<PAGE>
 

limitation, that (i) this Note is subject to prepayment, in whole or in part, as
specified in said Agreement, (ii) the principal of and interest on this Note is
subordinated to Senior Debt, as defined in the Agreement and (iii) in case of an
Event of Default, as defined in the Agreement, the principal of this Note may
become or may be declared due and payable in the manner and with the effect
provided in the Agreement.

     As further provided in the Agreement, upon surrender of this Note for
transfer or exchange, a new Note or new Notes of the same tenor dated the date
to which interest has been paid on the surrender Note and in an aggregate
principal amount equal to the unpaid principal amount of the Note so surrendered
will be issued to, and registered in the name of, the transferee or transferees.
The Company may treat the person in whose name this Note is registered as the
owner hereof for the purpose of receiving payment and for all other purposes.

     In case any payment herein provided for shall not be paid when due, the
Company promises to pay all cost of collection, including all reasonable
attorney's fees.

     This Note shall be governed by, and construed in accordance with, the laws
of the Commonwealth of Massachusetts and shall have the effect of a sealed
instrument.

     The Company and all endorsers and guarantors of this Note hereby waive
presentment, demand, notice of nonpayment, protest and all other demands and
notices in connection with the delivery, acceptance, performance or enforcement
of this Note.

                                   CREDIT TECHNOLOGIES, INC.


                                   By___________________________________
                                        Pamela D.A. Reeve, President


Attest:

By:__________________________

Title:_______________________

                                      46
<PAGE>
 

     The securities represented hereby have not been registered under the
Securities Act of 1933.  These securities have been acquired for investment and
not with a view to distribution or resale, and may not be sold, mortgaged,
pledged, hypothecated or otherwise transferred without an effective registration
statement for such securities under the Securities Act of 1933, or an opinion of
counsel reasonably satisfactory to the Company that registration is not required
under such act.


No. W-<n>                           Right to Purchase <shs> Shares
                                    of Common Stock of Credit
                                    Technologies, Inc.

                           CREDIT TECHNOLOGIES, INC.

                         Common Stock Purchase Warrant

     CREDIT TECHNOLOGIES, INC., a Delaware corporation (the "Company"), hereby
certifies that, for value received [NAME], or assigns, is entitled, subject to
the terms set forth below, to purchase from the Company at any time or from time
to time before 5:00 P.M., Boston time, on June 30, 2001, or such later time as
may be specified in Section 17 hereof, <shs> fully paid and nonassessable shares
of Common Stock, $.01 par value, of the Company, at a purchase price per share
of $4.00 (such purchase price per share as adjusted from time to time as herein
provided is referred to herein as the "Purchase Price").  The number and
character of such shares of Common Stock and the Purchase Price are subject to
adjustment as provided herein.

     This Warrant is one of the Common Stock Purchase Warrants (the "Warrants")
evidencing the right to purchase shares of Common Stock of the Company, issued
pursuant to a certain Subordinated Note and Warrant Purchase Agreement (the
"Agreement"), dated as of August 29, 1994, between the Company and the Persons
listed in the Schedule of Purchasers attached thereto, a copy of which is on
file at the principal office of the Company and the holder of this Warrant shall
be entitled to all of the benefits of the Agreement, as provided therein.

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

          (a) The term "Company" shall include Credit Technologies, Inc. and any
corporation which shall succeed or assume the obligations of the Company
hereunder.

                                      47
<PAGE>
 

          (b) The term "Common Stock" includes the Company's Common Stock, $.01
par value per share, as authorized on the date of the Agreement and any other
securities into which or for which such Common Stock may be converted or
exchanged pursuant to a plan of recapitalization, reorganization, merger, sale
of assets or otherwise.

          (c) The term "Other Securities" refers to 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, on 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 5 or otherwise.

     1.   Exercise of Warrant.
          ------------------- 

          1.1. Full Exercise.  This Warrant may be exercised in full by the
               -------------                                               
holder hereof by surrender of this Warrant, with the form of subscription at the
end hereof duly executed by such holder, to the Company at its principal office,
accompanied by payment, in cash or by certified or official bank check payable
to the order of the Company, in the amount obtained by multiplying the number of
shares of Common Stock for which this Warrant is then exercisable by the
Purchase Price then in effect.

          1.2. Partial Exercise.  This Warrant may be exercised in part by
               ----------------                                           
surrender of this Warrant in the manner and at the place provided in subsection
1.1 except that the amount payable by the holder on such partial exercise shall
be the amount obtained by multiplying (a) the number of shares of Common Stock
designated by the holder in the subscription at the end hereof by (b) the
Purchase Price then in effect.  On any such partial exercise the Company at its
expense will forthwith issue and deliver to or upon the order of the holder
hereof a new Warrant or Warrants of like tenor, in the name of the holder hereof
or as such holder (upon payment by such holder of any applicable transfer taxes)
may request, calling in the aggregate on the face or faces thereof for the
number of shares of Common Stock for which such Warrant or Warrants may still be
exercised.

          1.3. Payment by Notes Surrender.  Notwithstanding the payment
               --------------------------                              
provisions of subsections 1.1 and 1.2, all or part of the payment due upon
exercise of this Warrant in full or in part may be made by the surrender by such
holder to the Company of any of the Company's Notes issued pursuant to the
Agreement and such Notes so surrendered shall be credited against such payment
in an amount equal to the principal amount thereof plus premium (if any) and
accrued interest to the date of surrender.

                                      48
<PAGE>
 

          1.4  Net Issue Election.  The holder hereof may elect to receive,
               ------------------                                          
without the payment by such holder of any additional consideration, shares equal
to the value of this Warrant or any portion hereof by the surrender of this
Warrant or such portion to the Company, with the form of subscription at the end
hereof duly executed by such holder, at the office of the Company.  Thereupon,
the Company shall issue to such holder such number of fully paid and
nonassessable shares of Common Stock as is computed using the following formula:

                                  X = Y (A-B)
                                      -------
                                       A

where X = the number of shares to be issued to such holder pursuant to this
subsection 1.4.

      Y = the number of shares covered by this Warrant in respect of which the
net issue election is made pursuant to this subsection 1.4.

      A = the fair market value of one share of Common Stock, as determined in
good faith by the Board of Directors of the Company, as at the time the net
issue election is made pursuant to this subsection 1.4.

      B = the Purchase Price in effect under this Warrant at the time the net
issue election is made pursuant to this subsection 1.4.

The Board of Directors of the Company shall promptly respond in writing to an
inquiry by the holder hereof as to the fair market value of one share of Common
Stock.

          1.5. Company Acknowledgment.  The Company will, at the time of the
               ----------------------                                       
exercise of the Warrant, upon the request of the holder hereof acknowledge in
writing its continuing obligation to afford to such holder any rights to which
such holder shall continue to be entitled after such exercise in accordance with
the provisions of this Warrant.  If the holder shall fail to make any such
request, such failure shall not affect the continuing obligation of the Company
to afford to such holder any such rights.

          1.6. Trustee for Warrant Holders.  In the event that a bank or trust
               ---------------------------                                    
company shall have been appointed as trustee for the holders of the Warrants
pursuant to subsection 4.2, such bank or trust company shall have all the powers
and duties of a warrant agent appointed pursuant to section 12 and shall accept,
in its own name for the account of the Company or such successor person as may
be entitled thereto, all amounts otherwise payable to the Company or such
successor, as the case may be, on exercise of this Warrant pursuant to this
section 1.

                                      49
<PAGE>
 

     2.   Delivery of Stock Certificates, etc., on Exercise.  As soon as
          -------------------------------------------------             
practicable after the exercise of this Warrant in full or in part, and in any
event within 10 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 as such holder (upon payment by such
holder of any applicable transfer taxes) may direct, a certificate or
certificates for the number of fully paid and nonassessable shares of Common
Stock (or Other Securities) to which such holder shall be entitled on such
exercise, plus, in lieu of any fractional share to which such holder would
otherwise be entitled, cash equal to such fraction multiplied by the then
current market value of one full share, together with any other stock or other
securities and property (including cash, where applicable) to which such holder
is entitled upon such exercise pursuant to section 1 or otherwise.

     3.   Adjustment for Dividends in Other Stock, Property, etc.;
          --------------------------------------------------------
Reclassification, etc.  In case at any time or from time to time, the holders of
- ---------------------                                                           
Common Stock (or Other Securities) shall have received, or (on or after the
record date fixed for the determination of shareholders eligible to receive)
shall have become entitled to receive, without payment therefor,

               (a) other or additional stock or other securities or property
(other than cash) by way of dividend, or

               (b) any cash (excluding cash dividends payable solely out of
earnings or earned surplus of the Company), or

               (c) other or additional stock or other securities or property
(including cash) by way of spin-off, split-up, reclassification,
recapitalization, combination of shares or similar corporate rearrangement,

other than additional shares of Common Stock (or Other Securities) issued as a
stock dividend or in a stock-split (adjustments in respect of which are provided
for in subsection 5.4), then and in each such case the holder of this Warrant,
on the exercise hereof as provided in section 1, shall be entitled to receive
the amount of stock and other securities and property (including cash in the
cases referred to in subdivisions (b) and (c) of this section 3) which such
holder would hold on the date of such exercise if on the date hereof he had been
the holder of record of the number of shares of Common Stock called for on the
face of this Warrant and had thereafter, during the period from the date hereof
to and including the date of such exercise, retained such shares and all such
other or additional stock and other securities and property (including cash in
the cases referred to in subdivisions (b) and (c) of this section 3) receivable
by him as aforesaid during such period, giving effect to all adjustments called
for during such period by sections 4 and 5.

                                      50
<PAGE>
 

     4.   Adjustment for Reorganization, Consolidation, Merger, etc.
          --------------------------------------------------------- 

          4.1. In case at any time or from time to time, the Company shall (a)
effect a reorganization, (b) consolidate with or merge into any other person, or
(c) transfer all or substantially all of its properties or assets to any other
person under any plan or arrangement contemplating the dissolution of the
Company, then, in each such case, the holder of this Warrant, on the exercise
hereof as provided in section 1 at any time after the consummation of such
reorganization, consolidation or merger or the effective date of such
dissolution, as the case may be, shall receive, in lieu of the Common Stock (or
Other Securities) issuable on such exercise prior to such consummation or such
effective date, the stock and other securities and property (including cash) to
which such holder would have been entitled upon such consummation or in
connection with such dissolution, as the case may be, if such holder had so
exercised this Warrant, immediately prior thereto, all subject to further
adjustment thereafter as provided in sections 3 and 5.

          4.2. Dissolution.  In the event of any dissolution of the Company
               -----------                                                 
following the transfer of all or substantially all of its properties or assets,
the Company, prior to such dissolution, shall at its expense deliver or cause to
be delivered the stock and other securities and property (including cash, where
applicable) receivable by the holders of the Warrants after the effective date
of such dissolution pursuant to this section 4 to a bank or trust company having
its principal office in Boston, Massachusetts, as trustee for the holder or
holders of the Warrants.

          4.3. Continuation of Terms.  Upon any reorganization, consolidation,
               ---------------------                                          
merger or transfer (and any dissolution following any transfer) referred to in
this section 4, this Warrant shall continue in full force and effect and the
terms hereof shall be applicable to the shares of stock and other securities and
property receivable on the exercise of this Warrant after the consummation of
such reorganization, consolidation or merger or the effective date of
dissolution following any such transfer, as the case may be, and shall be
binding upon the issuer of any such stock or other securities, including, in the
case of any such transfer, the person acquiring all or substantially all of the
properties or assets of the Company, whether or not such person shall have
expressly assumed the terms of this Warrant as provided in section 6.

     5.   Adjustment for Issue or Sale of Common Stock at Less Than the Purchase
          ----------------------------------------------------------------------
Price in Effect.
- --------------- 

          5.1. General.  If the Company shall at any time or from time to time,
               -------                                                         
issue any additional shares of Common Stock (other than shares of Common Stock
excepted from the provisions of this section 5 by subsections 5.4 or 5.5)
without consideration or for a net consideration per share less than the
Purchase Price in effect immediately prior to such issuance, 

                                      51
<PAGE>
 

then, and in each such case: (a) the Purchase Price shall be lowered to an
amount determined by multiplying such Purchase Price then in effect by a
fraction:

          (1) the numerator of which shall be (a) the number of shares of
Common Stock outstanding immediately prior to the issuance of such additional
shares of Common Stock, plus (b) the number of shares of Common Stock which the
net aggregate consideration, if any, received by the Company for the total
number of such additional shares of Common Stock so issued would purchase at the
Purchase Price in effect immediately prior to such issuance, and

          (2) the denominator of which shall be (a) the number of shares of
Common stock outstanding immediately prior to the issuance of such additional
shares of Common Stock plus (b) the number of such additional shares of Common
Stock so issued;

and

(b) the holder of this Warrant shall thereafter, on the exercise hereof as
provided in section 1, be entitled to receive the number of shares of Common
stock determined by multiplying the number of shares of Common Stock which would
otherwise (but for the provisions of this subsection 5.1) be issuable on such
exercise by the fraction of which (i) the numerator is the Purchase Price which
would otherwise (but for the provisions of this subsection 5.1) be in effect,
and (ii) the denominator is the Purchase Price in effect on the date of such
exercise.

          5.2. Definitions, etc.  For purposes of this section 5 and of section
               ----------------                                                
7:

               The issuance of any warrants, options or other subscription or
purchase rights with respect to shares of Common Stock and the issuance of any
securities convertible into or exchangeable for shares of Common Stock (or the
issuance of any warrants, options or any rights with respect to such convertible
or exchangeable securities) shall be deemed an issuance at such time of such
Common Stock if the Net Consideration Per Share which may be received by the
Company for such Common Stock (as hereinafter determined) shall be less than the
Purchase Price at the time of such issuance and, except as hereinafter provided,
an adjustment in the Purchase Price and the number of shares of Common Stock
issuable upon exercise of this Warrant shall be made upon each such issuance in
the manner provided in subsection 5.1.  Any obligation, agreement or undertaking
to issue warrants, options, or other subscription or purchase rights at any time
in the future shall be deemed to be an issuance at the time such obligation,
agreement or undertaking is made or arises.  No adjustment of the Purchase Price
and the number of shares of Common Stock issuable upon exercise of this Warrant
shall be made under subsection 5.1 upon the issuance of any shares of Common
Stock which are issued pursuant to 

                                      52
<PAGE>
 

the exercise of any warrants, options or other subscription or purchase rights
or pursuant to the exercise of any conversion or exchange rights in any
convertible securities if any adjustment shall previously have been made upon
the issuance of any such warrants, options or other rights or upon the issuance
of any convertible securities (or upon the issuance of any warrants, options or
any rights therefor) as above provided. Any adjustment of the Purchase Price and
the number of shares of Common Stock issuable upon exercise of this Warrant with
respect to this subsection 5.2 which relates to warrants, options or other
subscription or purchase rights with respect to shares of Common Stock shall be
disregarded if, as, and when all of such warrants, options or other subscription
or purchase rights expire or are cancelled without being exercised, so that the
Purchase Price effective immediately upon such cancellation or expiration shall
be equal to the Purchase Price in effect at the time of the issuance of the
expired or cancelled warrants, options or other subscriptions or purchase
rights, with such additional adjustments as would have been made to that
Purchase Price had the expired or cancelled warrants, options or other
subscriptions or purchase rights not been issued. For purposes of this
subsection 5.2, the "Net Consideration Per Share" which may be received by the
Company shall be determined as follows:

          (A) The "Net Consideration Per Share" shall mean the amount equal to
the total amount of consideration, if any, received by the Company for the
issuance of such warrants, options, subscriptions, or other purchase rights or
convertible or exchangeable securities, plus the minimum amount of
consideration, if any, payable to the Company upon exercise or conversion
thereof, divided by the aggregate number of shares of Common Stock that would be
issued if all such warrants, options, subscriptions, or other purchase rights or
convertible or exchangeable securities were exercised, exchanged or converted.

          (B) The "Net Consideration Per Share" which may be received by the
Company shall be determined in each instance as of the date of issuance of
warrants, options, subscriptions or other purchase rights, or convertible or
exchangeable securities without giving effect to any possible future price
adjustments or rate adjustments which may be applicable with respect to such
warrants, options, subscriptions or other purchase rights or convertible
securities.

     For purposes of this section 5, if a part or all of the consideration
received by the Company in connection with the issuance of shares of the Common
Stock or the issuance of any of the securities described in this section 5,
consists of property other than cash, such consideration shall be deemed to have
the same value as shall be determined in good faith by the Board of Directors of
the Company.

     This subsection 5.2 shall not apply under any of the circumstances
described in 

                                      53
<PAGE>
 

subsections 5.4 or 5.5.
 
          5.3. Dilution in Case of Other Securities.  In case any Other
               ------------------------------------
Securities shall be issued or sold, or shall become subject to issue upon the
conversion or exchange of any stock (or Other Securities) of the Company (or any
other issuer of Other Securities or any other person referred to in section 4)
or to subscription, purchase or other acquisition pursuant to any rights or
options granted by the Company (or such other issuer or person), for a
consideration per share such as to dilute the purchase rights evidenced by this
Warrant, the computations, adjustments and readjustments provided for this
section 5 with respect to the Purchase Price and the number of shares of Common
Stock issuable upon exercise of this Warrant 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 on the exercise of the Warrants, so as
to protect the holders of the Warrants against the effect of such dilution.

          5.4. Extraordinary Events.  In the event that the Company shall (i)
               --------------------
issue additional shares of the Common Stock as a dividend or other distribution
on outstanding Common Stock, (ii) subdivide its outstanding shares of Common
Stock, or (iii) combine its outstanding shares of the Common Stock into a
smaller number of shares of the Common Stock, then, in each such event, the
Purchase Price shall, simultaneously with the happening of such event, be
adjusted by multiplying the then Purchase Price by a fraction, the numerator of
which shall be the number of shares of Common Stock outstanding immediately
prior to such event and the denominator of which shall be the number of shares
of Common Stock outstanding immediately after such event, and the product so
obtained shall thereafter be the Purchase Price then in effect. The Purchase
Price, as so adjusted, shall be readjusted in the same manner upon the happening
of any successive event or events described herein in this subsection 5.4. The
holder of this Warrant shall thereafter, on the exercise hereof as provided in
section 1, be entitled to receive that number of shares of Common Stock
determined by multiplying the number of shares of Common Stock which would
otherwise (but for the provisions of this subsection 5.4) be issuable on such
exercise by a fraction of which (i) the numerator is the Purchase Price which
would otherwise (but for the provisions of this subsection 5.4) be in effect,
and (ii) the denominator is the Purchase Price in effect on the date of such
exercise.

          5.5. Certain Issues of Common Stock Excepted.  Anything herein to the
               ---------------------------------------
contrary notwithstanding, the Company shall not be required to make any
adjustment of the Purchase Price or the number of shares for which this Warrant
is exercisable in the case of (i) the issuance of up to an aggregate of 900,000
shares (appropriately adjusted to reflect the occurrence of any event described
in subparagraph 5.4) of Common Stock or options thereof to directors, officers,
employees or consultants of the Company in connection with their service to the
Company or their employment by the Company or (ii) the conversation of shares of
the

                                      
<PAGE>
 

Company's Series A Convertible Preferred Stock, Series B Convertible Preferred
Stock and Series C Convertible Preferred Stock as authorized on the date hereof.
Any shares of Common Stock issued pursuant to this subparagraph 5.5 which are
hereinafter repurchased by the Company at a purchase price per share no greater
than the price per share paid to the Company upon the issuance of such shares
shall again be available for issuance pursuant to this subparagraph 5.5.

     6.   No Dilution or Impairment.  The Company will not, by amendment of its
          -------------------------
Certificate of Incorporation or through any reorganization, transfer of assets,
consolidation, merger, 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 the Warrants, 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 holders of the
Warrants against dilution or other impairment.  Without limiting the generality
of the foregoing, the Company (a) will not increase the par value of any shares
of stock receivable on the exercise of the Warrants above the amount payable
therefor on 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 all Warrants from time to
time outstanding, (c) will not issue any capital stock of any class which is
preferred as to dividends or as to the distribution of assets upon voluntary or
involuntary dissolution, liquidation or winding up, unless the rights of the
holders thereof shall be limited to a fixed sum or percentage of par value in
respect of participation in dividends and in any such distribution of assets,
and (d) will not transfer all or substantially all of its properties and assets
to any other person (corporate or otherwise), or consolidate with or merge into
any other person or permit any such person to consolidate with or merge into the
Company (if the Company is not the surviving person), unless such other person
shall expressly assume in writing and will be bound by all the terms of the
Warrants.

     7.   Certificate as to Adjustments.  In each case of any adjustment or
          -----------------------------
readjustment in the shares of Common Stock (or Other Securities) issuable on the
exercise of the Warrants, the Company at its expense will promptly cause its
Chief Financial Officer to compute such adjustment or readjustment in accordance
with the terms of the Warrants and prepare a certificate setting forth such
adjustment or readjustment and showing in detail the facts upon which such
adjustment or readjustment is based, including a statement of (a) the
consideration received or receivable by the Company for any additional shares of
Common Stock (or Other Securities) issued or sold or deemed to have been issued
or sold, (b) the number of shares of Common Stock (or Other Securities)
outstanding or deemed to be outstanding, and (c) the Purchase Price and the
number of shares of Common Stock to be received upon exercise of this Warrant,
in effect immediately prior to such issue or sale and as adjusted and readjusted
as 


<PAGE>
 

provided in this Warrant. The Company will forthwith mail a copy of each such
certificate to each holder of a Warrant, and will, on the written request at any
time of any holder of a Warrant, furnish to such holder a like certificate
setting forth the Purchase Price at the time in effect and showing how it was
calculated.

     8.   Notices of Record Date, etc.  In the event of
          ---------------------------

               (a)  any taking by the Company of a record of the holders of any
class or securities for the purpose of determining the holders thereof who are
entitled to receive any dividend 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
transfer of all or substantially all the assets of the Company to or
consolidation or merger of the Company with or into any other person, or

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

               (d)  any proposed issue or grant by the Company to all or
substantially all of its stockholders of any right or option to subscribe for,
purchase or otherwise acquire any shares of stock of any class or any other
securities,

then and in each such event the Company will mail or cause to be mailed to each
holder of a Warrant a notice specifying (i) the date on which any such record is
to be taken for the purpose of such dividend, distribution or right, and stating
the amount and character of such dividend, distribution or right, (ii) the date
on which any such reorganization, reclassification, recapitalization, transfer,
consolidation, merger, dissolution, liquidation or winding-up is to take place,
and the time, if any 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 securities or other property deliverable on such
reorganization, reclassification, recapitalization, transfer, consolidation,
merger, dissolution, liquidation or winding-up, and (iii) the amount and
character of any rights or options with respect to any shares of any stock of
any class or other securities proposed to be issued or granted by the Company to
all or substantially all of its stockholders, the date of such proposed issue or
grant and the persons or class of persons to whom such proposed issue or grant
is to be offered or made.  Such notice shall be mailed at least 20 days prior to
the date specified in such notice on which any such action is to be taken.


<PAGE>
 

     9.   Reservation of Stock, etc., Issuable on Exercise of Warrants.  The
          ------------------------------------------------------------
Company will at all times reserve and keep available, solely for issuance and
delivery on the exercise of the Warrants, all shares of Common Stock (or Other
Securities) from time to time issuable on the exercise of the Warrants.

     10.  Exchange of Warrants.  Subject to compliance with federal and
          --------------------
applicable state securities laws, on surrender for exchange of any Warrant,
properly endorsed, to the Company, the Company at its expense will issue and
deliver to or on the order of the holder thereof a new Warrant or Warrants of
like tenor, in the name of such holder or as such holder (on 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.

     11.  Replacement of Warrants.  On 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,
on delivery of an indemnity agreement or security reasonably satisfactory in
form and amount to the Company or, in the case of any such mutilation, on
surrender and cancellation of such Warrant, the Company at its expense will
execute and deliver, in lieu thereof, a new Warrant of like tenor.

     12.  Warrant Agent.  The Company may, by written notice to each holder of a
          -------------
Warrant, appoint an agent having an office in either Boston, Massachusetts or
New York, New York for the purpose of issuing Common Stock (or Other Securities)
on the exercise of the Warrants pursuant to section 1, exchanging Warrants
pursuant to section 10, and replacing Warrants pursuant to section 11, or any of
the foregoing, and thereafter any such issuance, exchange or replacement, as the
case may be, shall be made at such office by such agent.

     13.  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 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.

     14.  Negotiability, etc.  This Warrant is issued upon the following terms,
          ------------------
to all of which each holder or owner hereof by the taking hereof consents and
agrees:

               (a)  subject to compliance with federal and applicable state
securities laws, title to this Warrant may be transferred by endorsement (by the
holder hereof executing the


<PAGE>
 

form of assignment at the end hereof) and delivery in the same manner as in the
case of a negotiable instrument transferable by endorsement and delivery;

               (b)  subject to compliance with federal and applicable state
securities laws, any person in possession of this Warrant properly endorsed is
authorized to represent himself as absolute owner hereof and is empowered to
transfer absolute title hereto by endorsement and delivery hereof to a bona fide
purchaser hereof for value; each prior taker or owner waives and renounces all
of his equities or rights in this Warrant in favor of each such bona fide
purchaser, and each such bona fide purchaser shall acquire absolute title hereto
and to all rights represented hereby; and

               (c)  until this Warrant is transferred on the books of the
Company, the Company may treat the registered holder hereof as the absolute
owner hereof for all purposes, notwithstanding any notice to the contrary.

     15.  Notices, etc.  All notices and other communications from the Company
          ------------
to the holder of this Warrant shall be mailed by first class registered or
certified mail, postage prepaid, at such address as may have been furnished to
the Company in writing by such holder or, until any such holder furnishes to the
Company an address, then to, and at the address of, the last holder of this
Warrant who has so furnished an address to the Company.

     16.  Miscellaneous.  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. This Warrant shall be construed and enforced in accordance with and
governed by the laws of the Commonwealth of Massachusetts. The headings in this
Warrant are for purposes of reference only, and shall not limit or otherwise
affect any of the terms hereof. This Warrant is being executed as an instrument
under seal. The invalidity or unenforceability of any provision hereof shall in
no way affect the validity or enforceability of any other provision. The holder
of this Warrant shall have no rights as a stockholder with respect to shares
subject to this Warrant until such holder has exercised this Warrant for such
shares.

     17.  Expiration; Automatic Exercise.  The right to exercise this Warrant
          ------------------------------
shall expire at 5:00 P.M., Boston time, on the later of (i) June 30, 2001 or
(ii) at such time as all principal and interest on the Notes (as defined in the
Agreement) is paid in full. Notwithstanding the foregoing, this Warrant shall
automatically be deemed to be exercised in full pursuant to the provisions of
subsection 1.4 hereof, without any further action on behalf of the holder
hereof, immediately prior to the time this Warrant would otherwise expire
pursuant to the preceding sentence.


<PAGE>
 

Dated: August 29, 1994                     CREDIT TECHNOLOGIES, INC.


                                           By___________________________________
(Corporate Seal)                           Pamela D.A. Reeve, President

Attest:



By ________________________________
  Its



<PAGE>
 



                             FORM OF SUBSCRIPTION
                  (To be signed only on exercise of Warrant)

TO CREDIT TECHNOLOGIES, INC.

     The undersigned, the holder of the within Warrant, hereby irrevocably
elects to exercise this Warrant for, and to purchase thereunder, ........ shares
of Common Stock of CREDIT TECHNOLOGIES, INC. and herewith makes payment of
$........ therefor, and requests that the certificates for such shares be issued
in the name of, and delivered to ............, whose address is................


Dated:                                  ...............................
                                        (Signature must conform to name
                                        of holder as specified on the
                                        face of the Warrant)

                                        ...............................
                                                                  (Address)
                             ____________________

                              FORM OF ASSIGNMENT
                  (To be signed only on transfer of Warrant)


     For value received, the undersigned hereby sells, assigns, and transfers
unto .................. the right represented by the within Warrant to purchase
 ............. shares of Common Stock of CREDIT TECHNOLOGIES, INC. to which the
within Warrant relates, and appoints .......................... Attorney to
transfer such right on the books of CREDIT TECHNOLOGIES, INC. with full power of
substitution in the premises.


Dated:                                  ___________________________________
                                        (Signature must conform to name
                                        of holder as specified on the
                                        face of the Warrant)


                                        ___________________________________
                                                    (Address)


<PAGE>
 

Signed in the presence of:


___________________________________



<PAGE>
 
                                                            EXHIBIT 10.4


                     AMENDED AND RESTATED CREDIT AGREEMENT,
                           DATED AS OF JUNE 18, 1996,
                                 BY AND BETWEEN
                              SILICON VALLEY BANK
                                      AND
                               LIGHTBRIDGE, INC.

                                       
<PAGE>
 
                               TABLE OF CONTENTS
<TABLE> 
<S>                                                    <C>
1.   DEFINITIONS AND CONSTRUCTION...................     1
     ----------------------------     
     1.1  Definitions...............................     1
     1.2  Accounting Terms..........................     9

2.   LOAN AND TERMS OF PAYMENT......................     9
     2.1  Advances..................................     9
     2.1.1 Existing Indebtedness....................     9
     2.2  Equipment Advances........................    10
     2.3  Overadvances..............................    10
     2.4  Interest Rates, Payments and Calculations.    10
     2.5  Crediting Payments........................    11
     2.6  Fees......................................    11
     2.7  Additional Cost...........................    12
     2.8  Term......................................    12

3.   CONDITIONS OF LOAN.............................    12
     3.1  Conditions Precedent to Initial Loan......    13
     3.2  Conditions Precedent to all Advances......    13

4.   SECURITY.......................................    13
     4.1  Continuation of Security Interest.........    13
     4.2  Delivery of Additional Documentation 
           Required.................................    14

5.   REPRESENTATIONS AND WARRANTIES.................    14
     5.1  Due Organization and Qualification........    14
     5.2  Due Authorization: No Conflict............    14
     5.3  No Prior Encumbrances.....................    14
     5.4  Bona Fide Eligible Accounts...............    14
     5.5  Merchantable Inventory....................    14
     5.6  Name: Location of Chief Executive Office..    14
     5.7  Litigation................................    14
     5.8  No Material Adverse Change in Financial 
           Statements...............................    15
     5.9  Solvency..................................    15
     5.10 Regulatory Compliance.....................    15
     5.11 Environmental Condition...................    15
     5.12 Taxes.....................................    15
     5.13 Subsidiaries..............................    16
     5.14 Government................................    16
     5.15 Full Disclosure...........................    16

6.   AFFIRMATIVE COVENANTS..........................    16
     6.1  Good Standing.............................    16
</TABLE> 

                             -i-
<PAGE>
 
<TABLE> 
<S>                                                    <C>
     6.2  Government Compliance.....................    16
     6.3  Financial Statements, Reports, 
           Certificates.............................    16
     6.4  Inventory; Returns........................    17
     6.5  Taxes.....................................    17
     6.6  Insurance.................................    17
     6.7  Principal Depository......................    18
     6.8  Quick Ratio...............................    18
     6.9  Tangible Net Worth........................    18
     6.10 Debt-Net Worth Ratio......................    18
     6.11 Liquidity.................................    18
     6.12 Minimum Debt Service......................    18
     6.13 Profitability.............................    18
     6.14 Registration of Intellectual Property 
           Rights...................................    18
     6.15 Further Assurances........................    19

7.   NEGATIVE COVENANTS.............................    19
     7.1  Dispositions..............................    19
     7.2  Change in Business........................    19
     7.3  Mergers or Acquisitions...................    19
     7.4  Indebtedness..............................    19
     7.5  Encumbrances..............................    19
     7.6  Distributions.............................    19
     7.7  Investments...............................    20
     7.8  Transactions with Affiliates..............    20
     7.9  Subordinated Debt.........................    20
     7.10 Inventory.................................    20
     7.11 Compliance................................    20

8.   EVENTS OF DEFAULT..............................    20
     8.1  Payment Default...........................    20
     8.2  Covenant Default..........................    20
     8.3  Material Adverse Developments.............    21
     8.4  Attachment................................    21
     8.5  Insolvency................................    22
     8.6  Other Agreements..........................    22
     8.7  Subordinated Debt.........................    22
     8.8  Judgments.................................    22
     8.9  ERISA.....................................    22
     8.10 Misrepresentations........................    22

9.   BANKS RIGHTS AND REMEDIES......................    22
     9.1  Rights and Remedies.......................    23
     9.2  Power of Attorney.........................    23
     9.3  Bank Expenses.............................    23
     9.4  Remedies Cumulative.......................    24
</TABLE>

                             -ii-
<PAGE>
 
<TABLE> 
<S>                                                    <C> 
     9.5  Demand; Protest...........................    24

10.  NOTICES........................................    24

11.  CHOICE OF LAW AND VENUE: JURY TRIAL WAIVER.....    25
 
12.  GENERAL PROVISIONS.............................    25
     12.1 Successors and Assigns....................    25
     12.2 Indemnification...........................    26
     12.3 Time of Essence...........................    26
     12.4 Severability of Provisions................    26
     12.5 Amendments in Writing; Integration........    26
     12.6 Counterparts..............................    26
     12.7 Survival..................................    26
     12.8 Confidentiality...........................    26
     12.9 Countersignature..........................    27
</TABLE>
SCHEDULE    Schedule of Exceptions

EXHIBIT A   Loan Payment/Advance Telephone Request Form

EXHIBIT B   Borrowing Base Certificate

EXHIBIT C   Compliance Certificate


                          -iii-
                                       
<PAGE>
 
     This AMENDED AND RESTATED LOAN AND SECURITY AGREEMENT is dated as of the 18
day of June, 1996, by SILICON VALLEY BANK, a California-chartered bank ("Bank"),
with its principal place of business at 3003 Tasman Drive, Santa Clara, CA 95054
and with a loan production office located at Wellesley Office Park, 40 William
Street, Suite 350, Wellesley, MA 02181, doing business under the name "Silicon
Valley East", and LIGHTBRIDGE, INC. (formerly known as Credit Technologies,
Inc.), a Delaware corporation ("Borrower").


                                    RECITALS
                                    --------

     WHEREAS, Borrower and Bank have previously executed a Credit Agreement,
dated as of October 5, 1994, amending and restating a certain Commitment Letter
dated as of April 1, 1992, as amended by a First Amendment thereto dated as of
April 5, 1993, and a Second Amendment thereto dated as of June 5, 1994
(hereinafter, the "Existing Agreement");

     WHEREAS, pursuant to a Security Agreement dated as of April 1, 1992, as
amended by a First Amendment to Security Agreement dated as of October 5, 1994,
Borrower granted to Bank a continuing security interest in and to certain
Collateral to secure Borrower's obligations to Bank;

     WHEREAS, Borrower and Bank wish to amend the Existing Agreement to increase
the working capital line of credit from $2,000,000 to $4,000,000 and to permit
certain other borrowings;

     WHEREAS, Borrower and Bank wish to amend the Existing Agreement in certain
other respects;

     NOW, THEREFORE, in furtherance of the foregoing, and in consideration of
the mutual promises and agreements of the parties which are set forth herein,
the parties hereto hereby agree that , subject to the satisfaction of the terms
and conditions set forth herein, the Existing Agreement shall be amended and
restated in its entirety to read as follows:


     1.   DEFINITIONS AND CONSTRUCTION
          ----------------------------

     1.1 Definitions. - As used in this Agreement, the following terms shall
         -----------
have the following definitions:

     "Accounts" means all presently existing and hereafter arising accounts,
contract rights, and all other forms of obligations owing to Borrower arising
out of the sale or lease of goods (including, without limitation, the licensing
of software and other technology) or the rendering of services by Borrower,
whether or not earned by performance, and any and all credit insurance,
guaranties, and other security therefor, as well as all merchandise returned to
or reclaimed by Borrower and Borrower's Books relating to any of the foregoing.

     "Advance" or "Advances" means an Advance under the Committed Revolving
Line.

                                       
<PAGE>
 
     "Affiliate" means, with respect to any Person, any Person that owns or
controls directly or indirectly such Person, any Person that controls or is
controlled by or is under common control with such Person, and each of such
Person's senior executive officers, directors, and partners.

     "Agreement" means this Amended and Restated Credit Agreement, as amended,
supplemented or modified from time to time in accordance with its terms.

     "Bank Expenses" means all: reasonable costs or expenses (including
reasonable attorneys' fees and expenses) incurred in connection with the
preparation, negotiation, administration, and enforcement of the Loan Documents;
and Bank's reasonable attorneys' fees and expenses incurred in amending,
enforcing or defending the Loan Documents, whether or not suit is brought.

     "Borrower's Books" means all of Borrower's books and records including:
ledgers; records concerning Borrower's assets or liabilities, the Collateral,
business operations or financial condition; and all computer programs, or tape
files, and the equipment, containing such information.

     "Borrowing Base" has the meaning set forth in Section 2.1 hereof

     "Business Day" means any day that is not a Saturday, Sunday, or other day
on which banks in the State of California are authorized or required to close.

     "Closing Date" means the date of this Agreement.

     "Code" means the Massachusetts Uniform Commercial Code.

     "Collateral" has the meaning given that term in the Security Agreement.

     "Committed Revolving Line" means Four Million Dollars ($4,000,000).

     "Committed Equipment Line" means Two Million Dollars ($2,000,000).

     "Contingent Obligation" means, as applied to any Person, any direct or
indirect liability, contingent or otherwise, of that Person with respect to (i)
any indebtedness, lease, dividend, letter of credit or other obligation of
another, including, without limitation, any such obligation directly or
indirectly guaranteed, endorsed, co-made or discounted or sold with recourse by
that Person, or in respect of which that Person is otherwise directly or
indirectly liable; (ii) any obligations with respect to undrawn letters of
credit issued for the account of that Person; and (iii) all obligations arising
under any interest rate, currency or commodity swap agreement, interest rate cap
agreement, interest rate collar agreement, or other agreement or arrangement
designated to protect a Person against fluctuation in interest rates, currency
exchange rates or commodity prices; provided, however, that the term "Contingent
Obligation" 

                                 -2-
<PAGE>
 
shall not include endorsements for collection or deposit in the ordinary course
of business. The amount of any Contingent Obligation shall be deemed to be an
amount equal to the stated or determined amount of the primary obligation in
respect of which such Contingent Obligation is made or, if not stated or
determinable, the maximum reasonably anticipated liability in respect thereof as
determined by such Person in good faith; provided, however, that such amount
shall not in any event exceed the maximum amount of the obligations under the
guarantee or other support arrangement.

     "Controlled Group" means all members of a controlled group of corporations
and all trades or businesses (whether or not incorporated) under common control
which, together with Borrower, are treated as a single employer under Section
414 of the IRC.

     "Current Assets" means, as of any applicable date, all amounts that should,
in accordance with GAAP, be included as current assets on the consolidated
balance sheet of Borrower and its Subsidiaries as at such date.

     "Current Liabilities" means, as of any applicable date, all amounts that
should, in accordance with GAAP, be included as current liabilities on the
consolidated balance sheet of Borrower and its Subsidiaries, as at such date,
plus, to the extent not already included therein, all outstanding Advances and
the current portion of any Equipment Advances made under this Agreement,
including all Indebtedness that is payable upon demand or within one year from
the date of determination thereof unless such Indebtedness is renewable or
extendable at the option of Borrower or any Subsidiary to a date more than one
year from the date of determination, but excluding Subordinated Debt.

     "Daily Balance" means the amount of the Obligations owed at the end of a
given day.

     "Eligible Accounts" means those Accounts that arise in the ordinary course
of Borrower's business that comply with all of Borrower's representations and
warranties to Bank set forth in Section 5.4; provided, that standards of
                                             --------                   
eligibility may be fixed and revised from time to time by Bank in Bank's
reasonable judgment and upon notification thereof to Borrower in accordance with
the provisions hereof.  Unless otherwise agreed to by Bank, Eligible Accounts
shall not include the following:

     (a)  Accounts that the account debtor has failed to pay within ninety (90)
days of invoice date;

     (b) Accounts with respect to an account debtor, fifty percent (50%) of
whose Accounts the account debtor has failed to pay within ninety (90) days of
invoice date;

     (c)  Accounts with respect to which the account debtor is an officer,
employee, or agent of Borrower;

                                   -3-
<PAGE>
 
     (d)  Accounts with respect to which goods are placed on consignment,
guaranteed sale, sale or return, sale on approval bill and hold, or other terms
by reason of which the payment by the account debtor may be conditional;

     (e)  Accounts with respect to which the account debtor is an Affiliate
(other than by virtue of being directly or indirectly under common ownership or
control with Borrower) of Borrower;

     (f)  Accounts with respect to which the account debtor does not have its
principal place of business in the United States, and Accounts arising from
products shipped to or services provided to branches or offices located in the
United States of any account debtor that does not have its principal place of
business in the United States;

     (g)  Accounts with respect to which the account debtor is a federal state,
local governmental entity or any department, agency, or instrumentality thereof;

     (h) Accounts with respect to which Borrower is liable to the account debtor
for goods sold or services rendered by the account debtor to Borrower, but only
to the extent of any amounts owing to the account debtor against amounts owed to
Borrower;

     (i)  Accounts with respect to an account debtor, including Subsidiaries and
Affiliates, whose total obligations to Borrower exceed forty percent (40%) of
all Accounts, to the extent such obligations exceed the aforementioned
percentage, except as approved in writing by Bank;

     (j) Accounts with respect to which the account debtor disputes liability or
makes any claim with respect thereto as to which Bank believes, in its sole
discretion, that there may be a basis for dispute (but only to the extent of the
amount subject to such dispute or claim), or is subject to any Insolvency
Proceeding, or becomes insolvent, or goes out of business; or

     (k)  Accounts the collection of which Bank reasonably determines to be
doubtful.

     "Equipment" means all present and future machinery, equipment, tenant
improvements, furniture, fixtures, vehicles, tools, parts and attachments in
which Borrower has any interest.

     "Equipment Advance" or "Equipment Advances" means an Equipment Advance
under the Committed Equipment Line.

     "Equipment Availability End Date" has the meaning set forth in Section
2.2(a) hereof.

                                  -4-
<PAGE>
 
     "ERISA" means the Employment Retirement Income Security Act of 1974, as
amended, and the regulations thereunder.

     "Existing Agreement" has the meaning set forth in the Recitals to this
Agreement.

     "GAAP" means generally accepted accounting principles as in effect from
time to time.

     "Indebtedness" means (a) all indebtedness for borrowed money or the
deferred purchase price of property or services, including, without limitation,
reimbursement and other obligations with respect to surety bonds and letters of
credit, (b) all obligations evidenced by notes, bonds, debentures or similar
instruments, (c) all capital lease obligations and (d) all Contingent
Obligations.

     "Insolvency Proceeding" means any proceeding commenced by or against any
person or entity under any provision of the United States Bankruptcy Code, as
amended, or under any other bankruptcy or insolvency law, including assignments
for the benefit of creditors, formal or informal moratoria, compositions,
extension generally with its creditors, or proceedings seeking reorganization,
arrangement, or other relief.

     "Inventory" means all present and future inventory in which Borrower has
any interest, including merchandise, raw materials, parts, supplies, packing,
and shipping materials, work in process and finished products intended for sale
or lease or to be furnished under a contract of service, of every kind and
description now or at any time hereafter owned by or in the custody or
possession, actual or constructive, of Borrower, including such inventory as is
temporarily out of its custody or possession or in transit and including any
returns upon any accounts or other proceeds, including insurance proceeds,
resulting from the sale or disposition of any of the foregoing and any documents
of title representing any of the above, and Borrower's Books relating to any of
the foregoing.

     "Investment" means any beneficial ownership of (including stock,
partnership interest or other securities) any Person, or any loan, advance or
capital contribution to any Person.

     "IRC" means the Internal Revenue Code of 1986, as amended, and the
regulations thereunder.

     "Lien" means any mortgage, lien, deed of trust, charge, pledge, security
interest or other encumbrance.

     "Loans" means, collectively, the Advances and the Equipment Advances; and
"Loan" means any Advance or Equipment Advance.

                                  -5-
<PAGE>
 
     "Loan Documents" means, collectively, this Agreement, any note or notes
executed by Borrower, and any other agreement entered into between Borrower and
Bank in connection with this Agreement, all as amended or extended from time to
time.

     "Material Adverse Effect" means a material adverse effect on (i) the
business operations or condition (financial or otherwise) of Borrower and its
Subsidiaries taken as a whole or (ii) the ability of Borrower to repay the
Obligations or otherwise perform its obligations under the Loan Documents.

     "Multiemployer Plan" means at any time an employee pension benefit plan
within the meaning of Section 4001(a)(3) of ERISA to which Borrower or any
member of the Controlled Group is then making or accruing an obligation to make
contributions or has within the preceding five plan years made contributions,
including for these purposes any Person which ceased to be a member of the
Controlled Group during such five year period.

     "Negotiable Collateral" means all of Borrower's present and future letters
of credit of which it is a beneficiary, notes, drafts, instruments, securities,
documents of title, and chattel paper, and Borrower's Books relating to any of
the foregoing.

     "Obligations" means all debt, principal interest, Bank Expenses and other
amounts owed to Bank by Borrower pursuant to this Agreement or any other
agreement, whether absolute or contingent, due or to become due, now existing or
hereafter arising, including any interest that accrues after the commencement of
an Insolvency Proceeding and including any debt, liability, or obligation owing
from Borrower to others that Bank may have obtained by assignment or otherwise.

     "Payment Date" means the last calendar day of each month.

     "PBGC" means the Pension Benefit Guaranty Corporation or any entity
succeeding, to any or all of its functions under ERISA.

     "Periodic Payments" means all installments or similar recurring payments
that Borrower may now or hereafter become obligated to pay to Bank pursuant to
the terms and provisions of any instrument, or agreement now or hereafter in
existence between Borrower and Bank.

     "Permitted Indebtedness" mean:

     (a)  Indebtedness of Borrower in favor of Bank;

     (b)  Indebtedness existing on the Closing Date and disclosed in the 
Schedule;

     (c)  Subordinated Debt; and

                                    -6-
<PAGE>
 
     (d)  Indebtedness to trade creditors incurred in the ordinary course of
business.

     "Permitted Investment" means:

     (a) Investments existing on the Closing Date disclosed in the Schedule; and

     (b)  (i) marketable direct obligations issued or unconditionally guaranteed
by the United States of America or any agency or any State thereof maturing
within one (1) year from the date of acquisition thereof, (ii) commercial paper
maturing no more than one (1) year from the date of creation thereof and
currently having the highest rating obtainable from either Standard & Poor's
Corporation or Moody's Investors Service, Inc., and (iii) certificates of
deposit maturing no more than one (1) year from the date of investment therein
issued by Bank.

     "Permitted Liens" means the following:

     (a)  Any Liens existing on the Closing Date and disclosed in the Schedule;

     (b)  Liens in favor of Bank, including, without limitation, Liens arising
under this Agreement or the other Loan Documents;

     (c)  Liens for taxes, fees, assessments or other governmental charges or
levies, either not delinquent or being contested in good faith by appropriate
proceedings, provided the same have no priority over any of Bank's security
             --------                                                      
interests;

     (d)  Liens (1) upon or in any equipment acquired or held by Borrower or any
of its Subsidiaries to secure the purchase price of such equipment or
indebtedness incurred solely for the purpose of financing the acquisition of
such equipment, or (ii) existing on such equipment at the time of its
acquisition, provided that the Lien is confined solely to the property so
             --------                                                    
acquired and improvements thereon, and the proceeds of such equipment;

     (e) Liens incurred in connection with the extension, renewal or refinancing
of the indebtedness secured by Liens of the type described in clauses (a)
through (d) above, provided that any extension, renewal or replacement Lien
                   --------                                                
shall be limited to the property encumbered by the existing Lien and the
principal amount of the indebtedness being extended, renewed or refinanced does
not increase.

     "Person" means any individual sole proprietorship, partnership, limited
liability company, joint venture, trust, unincorporated organization,
association, corporation, institution, public benefit corporation, firm, joint
stock company, estate, entity or governmental agency.

                                  -7-
<PAGE>
 
     "Plan" means any employee pension benefit plan which is covered by Title IV
of ERISA or subject to minimum funding standards under Section 412 of the IRC
and is either (a) maintained by Borrower or any member of the Controlled Group
for employees of Borrower or any member of the Controlled Group or (b)
maintained pursuant to a collective bargaining agreement or any other
arrangement under which more than one employer makes contributions and to which
Borrower or any member of the Controlled Group is then making or accruing an
obligation to make contributions or has within the preceding five plan years
made contributions.

     "Present Unpaid Amount" means the presently outstanding amount of advances
made by Bank to Borrower under the Existing Agreement, which as of the date
hereof is $1,500,000.

     "Prime Rate" means the variable rate of interest, per annum, most recently
announced by Bank, as its "prime rate," whether or not such announced rate is
the lowest rate available from Bank.

     "Quick Assets" means, at any date as of which the amount thereof shall be
determined, the consolidated cash, cash-equivalents, accounts receivable and
investments, with maturities not to exceed 90 days, of Borrower determined in
accordance with GAAP.

     "Responsible Officer" means each of the Chief Executive Officer, the Chief
Financial Officer and the Controller of Borrower.

     "Revolving Maturity Date" means June 5, 1997.

     "Schedule" means the schedule of exceptions attached hereto.

     "Security Agreement" has the meaning set forth in Section 4.1 hereof.

     "Subordinated Debt" means any debt incurred by Borrower that is
subordinated to the debt owing by Borrower to Bank on terms acceptable to Bank
(and identified as being such by Borrower and Bank).

     "Subsidiary" means any corporation or partnership in which (1) any general
partnership interest or (ii) more than 50% of the stock of which by the terms
thereof ordinary voting power to elect the Board of Directors, managers or
trustees of the entity shall, at the time as of which any determination is being
made, be owned by Borrower, either directly or through an Affiliate.

     "Tangible Net Worth" means at any date as of which the amount thereof shall
be determined, the consolidated total assets of Borrower and its Subsidiaries
                                                                             
minus, without duplication, (i) the sum of any amounts attributable to (a)
- -----                                                                     
goodwill, (b) intangible items such as unamortized debt discount and expense,
patents, trade and service marks and names, copyrights 

                                 -8-
<PAGE>
 
and research and development expenses except prepaid expenses, and (c) all
reserves not already deducted from assets, and (ii) Total Liabilities.
                                           ===

     "Total Liabilities" means at any date as of which the amount thereof shall
be determined, all obligations that should, in accordance with GAAP be
classified as liabilities on the consolidated balance sheet of Borrower,
including in any event all Indebtedness, but specifically excluding Subordinated
Debt.

     "Trademarks Assignment" has the meaning set forth in Section 4.1 hereof.

     1.2 Accounting Terms. All accounting terms not specifically defined herein
         -----------------                                                     
shall be construed in accordance with GAAP and all calculations made hereunder
shall be made in accordance with GAAP.  When used herein, the terms "financial
statements" shall include the notes and schedules thereto.

     2.  LOAN AND TERMS OF PAYMENT
         -------------------------

     2.1  Advances.  Subject to and upon the terms and conditions of this
          ---------                                                       
Agreement, Bank agrees to make Advances to Borrower in an aggregate amount not
to exceed the Committed Revolving Line or the Borrowing Base, whichever is less.
For purposes of this Agreement, "Borrowing Base" shall mean an amount equal to
eighty percent (80%) of Eligible Accounts.  Subject to the terms and conditions
of this Agreement, amounts borrowed pursuant to this Section 2.1 may be repaid
and reborrowed at any time during the term of this Agreement.

     Whenever Borrower desires an Advance, Borrower will notify Bank by
facsimile transmission or telephone no later than 3:00 p.m Pacific time, on the
Business Day that the Advance is to be made.  Each such notification shall be
promptly confirmed by a Payment/Advance Form in substantially the form of
Exhibit A hereto.  Bank is authorized to make Advances under this Agreement,
- ---------                                                                   
based upon instructions received from a Responsible Officer, or without
instructions if in Bank's discretion such Advances are necessary to meet
Obligations which have become due and remain unpaid.  Bank shall be entitled to
rely on any telephonic notice given by a person who Bank reasonably believes to
be a Responsible Officer, and Borrower shall indemnify and hold Bank harmless
for any damages or loss suffered by Bank as a result of such reliance.  Bank
will credit the amount of Advances made under this Section 2.1 to Borrower's
deposit account.

     The Committed Revolving Line shall terminate on the Revolving Maturity
Date, at which time all Advances under this Section 2. 1, all accrued and unpaid
interest thereon and other amounts due under this Agreement (except as otherwise
expressly specified herein) shall be immediately due and payable.

     2.1.1  Existing Indebtedness.  Borrower acknowledges that, pursuant to the
            ----------------------                                              
Existing Agreement, Bank has made certain advances to Borrower, the current
outstanding amount of which is equal to the Present Unpaid Amount.  Borrower and
Bank agree that such 

                                    -9-
<PAGE>
 
Present Unpaid Amount shall hereafter constitute Advances made pursuant to this
Agreement, and the obligations of Borrower with respect to such Advances shall
be governed by the terms and conditions of this Agreement and the note executed
in connection herewith.

     2.2   Equipment Advances.
           ------------------ 

     (a)  At any time from the date hereof through December 31, 1996 (the
"Equipment Availability End Date"), Borrower may from time to time request
advances (each an "Equipment Advance" and collectively, the "Equipment
Advances") from Bank in an aggregate amount not to exceed the Committed
Equipment Line.  To evidence the Equipment Advance or Equipment Advances,
Borrower shall deliver to Bank, at the time of each Equipment Advance request,
an invoice for the equipment to be purchased. The Equipment Advances shall be
used only to purchase equipment, and shall not exceed One Hundred Percent (100%)
of the invoice amount of such equipment approved from time to time by Bank,
excluding taxes, shipping, warranty charges, freight discounts and installation
expense. Borrower may, however, use Equipment Advances aggregating up to Five
Hundred Thousand Dollars ($500,000.00) to purchase software.

     (b)  Interest shall accrue from the date of each Equipment Advance at the
rate specified in Section in Section 2.4(a), and shall be payable monthly for
each month through the month in which the Equipment Availability End Date falls.
Any Equipment Advance or Equipment Advances that are outstanding on the
Equipment Availability End Date will be payable in thirty consecutive equal
monthly installments of principal, plus interest, beginning January 31, 1997,
and on the Payment Date of each month thereafter until the entire principal
balance shall have been paid in full.

     (c)  When Borrower desires to obtain an Equipment Advance, Borrower shall
notify Bank (which notice shall be irrevocable) by facsimile transmission to be
received no later than 3:00 p.m. Pacific time one (1) Business Day before the
day on which the Equipment Advance is to be made. Such notice shall be
substantially in the form of Exhibit A. The notice shall be signed by a
Responsible Officer and include a copy of the invoice for the Equipment to be
financed.

     2.3  Overadvances.  If, at any time or for any reason, (a) the outstanding
          -------------                                                         
principal amount of Advances hereunder exceeds the lesser of (i) the Committed
Revolving Line or (ii)  the Borrowing Base, and/or (b) the outstanding principal
amount of Equipment Advances exceeds the Committed Equipment Line, Borrower
shall immediately pay to Bank, in cash, the amount of such excess.

     2.4  Interest Rates, Payments and Calculations.
          ----------------------------------------- 

     (a) Interest Rate. Except as set forth in Section 2.4(b), (i) each Advance
         -------------                                                       
shall bear interest, on the average Daily Balance, at a rate equal to one-
quarter of one percentage point (0.250%) above the Prime Rate, and (ii) each
Equipment Advance shall bear 

                                   -10-
<PAGE>
 
interest, on the average Daily Balance, at a rate equal to three-quarters of one
percentage point (0.750%) above the Prime Rate.

     (b)  Default Rate.  All Obligations shall bear interest, from and after the
          ------------                                                          
occurrence of an Event of Default, at a rate equal to five percentage points
(5.000%) above the interest rate applicable immediately prior to the occurrence
of the Event of Default.

     (c)  Payments.  Interest hereunder shall be due and payable on the Payment
          --------                                                             
Date of each month during the term hereof. Borrower hereby authorizes Bank to
debit any accounts with Bank, including, without limitation, Account Number
700195970 for payments of principal and interest due on the Obligations and any
other amounts owing by Borrower to Bank.  Bank will notify Borrower of all
debits which Bank makes against Borrower's accounts.  Any such debits against
Borrower's accounts in no way shall be deemed a set-off.  Any interest not paid
when due shall be compounded by becoming a part of the Obligations, and such
interest shall thereafter accrue interest at the rate then applicable hereunder.

     (d)  Computation.  In the event the Prime Rate is changed from time to time
          -----------                                                           
hereafter, the applicable rate of interest hereunder shall be increased or
decreased effective as of 12:01 a.m on the day the Prime Rate is changed, by an
amount equal to such change in the Prime Rate.  All interest chargeable under
the Loan Documents shall be computed on the basis of a three hundred sixty (360)
day year for the actual number of days elapsed.

     2.5  Crediting Payments.  Prior to the occurrence of an Event of Default,
          -------------------                                                  
Bank shall credit a wire transfer of funds, check or other item of payment to
such deposit account or Obligation as Borrower specifies.  After the occurrence
of an Event of Default, the receipt by Bank of any wire transfer of funds,
check, or other item of payment shall be immediately applied to conditionally
reduce Obligations, but shall not be considered a payment on account unless such
payment is of immediately available federal funds or unless and until such check
or other item of payment is honored when presented for payment.  Notwithstanding
anything to the contrary contained herein, any wire transfer or payment received
by Bank after 12:00 noon Pacific time shall be deemed to have been received by
Bank as of the opening of business on the immediately following Business Day.
Whenever any payment to Bank under the Loan Documents would otherwise be due
(except by reason of acceleration) on a date that is not a Business Day, such
payment shall instead be due on the next Business Day, and additional fees or
interest, as the case may be, shall accrue and be payable for the period of such
extension.

     2.6  Fees.  Borrower shall pay to Bank the following:
          -----                                            

     (a)  Facility Fees.  Facility Fees equal to one-quarter of one percentage
          --------------                                                       
point of the Committed Revolving Line or Ten Thousand Dollars ($10,000), in the
case of the Committed Revolving Line, and Two Thousand Five Hundred Dollars
($2,500), in the case of the Committed Equipment Line, which fees shall be due
on the Closing Date and shall be fully earned and non-refundable;

                                   -11-
<PAGE>
 
     (b)  Financial Examination and Appraisal Fees.  Bank's customary fees and
          ----------------------------------------                            
out-of-pocket expenses for Bank's audits of Borrower's Accounts, and for each
appraisal of Collateral and financial analysis and examination of Borrower
performed from time to time by Bank or its agents;

     (c)  Bank Expenses.  Upon demand from Bank, including, without limitations
          -------------                                                        
upon the date hereof, all Bank Expenses incurred through the date hereof,
including reasonable attorneys' fees and expenses, and, after the date hereof,
all Bank Expenses, including reasonable attorneys' fees and expenses, as and
when they become due.

     2.7  Additional Cost.  In case any law, regulation, treaty or official
          ----------------                                                  
directive or the interpretation or application thereof by any court or any
governmental authority charged with the administration thereof or the compliance
with any guideline or request of any central bank or other governmental
authority (whether or not having the force of law):

     (a)  subjects Bank to any tax with respect to payments of principal or
interest or any other amounts payable hereunder by Borrower or otherwise with
respect to the transactions contemplated hereby (except for taxes on the overall
net income of Bank imposed by the United States of America or any political
subdivision thereof);

     (b)  imposes, modifies or deems applicable any deposit insurance, reserve,
special deposit or similar requirement against assets held by, or deposits in or
for the account of, or loans by, Bank; or

     (c)  imposes upon Bank any other condition with respect to its performance
under this Agreement, and the result of any of the foregoing is to increase the
cost to Bank, reduce the income receivable by Bank or impose any expense upon
Bank with respect to any loans, Bank shall notify Borrower thereof. Borrower
agrees to pay to Bank the amount of such increase in cost, reduction in income
or additional expense as and when such cost, reduction or expense is incurred or
determined upon presentation by Bank of a statement of the amount and setting
forth Bank's calculation thereof, all in reasonable detail, which statement
shall be deemed true and correct absent manifest error.

     2.8  Term. Except as otherwise set forth herein, this Agreement shall 
          -----  
become effective on the Closing Date and, subject to Section 12.7, shall
continue in full force and effect until all Obligations are paid in full.
Notwithstanding the foregoing, Bank shall have the right to terminate its
obligation to make Loans under this Agreement immediately and without notice
upon the occurrence and during the continuance of an Event of Default.
Notwithstanding termination, Bank's Lien on the Collateral shall remain in
effect for so long as any Obligations are outstanding.

     3.  CONDITIONS OF LOAN
         ------------------

                                     -12-
<PAGE>
 
     3.1  Conditions Precedent to Initial Loan. The obligation of Bank to make
          -------------------------------------                                
the initial Loan is subject to the condition precedent that Bank shall have
received, in form and substance satisfactory to Bank, the following:

     (a)  this Agreement;

     (b)  a certificate of the Secretary of Borrower with respect to incumbency
and resolutions authorizing the execution and delivery of this Agreement;

     (c)  an opinion of Borrower's counsel;

     (d)  insurance certificate;

     (e)  payment of the fees and Bank Expenses then due specified in Section 
2.6 hereof; and

     (f)  such other documents, and completion of such other matters, as Bank 
may reasonably deem necessary or appropriate.

     3.2  Conditions Precedent to all Loans.  The obligation of Bank to make 
          ----------------------------------                                 
each Loan, including the initial Loan, is further subject to the following
conditions:

     (a)  timely receipt by Bank of the Payment/Advance Form as provided in
Section 2.1 or 2.2, as applicable; and

     (b) the representations and warranties contained in Section 5 shall be true
and correct in all material respects on and as of the date of such
Payment/Advance Form and on the effective date of each Loan as though made at
and as of each such date, and no Event of Default shall have occurred and be
continuing, or would result from such Loan. The making of each Loan shall be
deemed to be a representation and warranty by Borrower on the date of such Loan
as to the accuracy of the facts referred to in this Section 3.2(b).

     4.   SECURITY
          --------

     4.1  Continuation of Security Interest.  This Agreement and the other Loan
          ----------------------------------                                    
Documents and all Obligations of Borrower to Bank arising hereunder or
thereunder shall continue to be secured under the terms of (i) that certain
Security Agreement dated as of April 1, 1992, as amended by a First Amendment
thereto dated October 5, 1994 (the "Security Agreement"), pursuant to which
Borrower has granted to Bank a continuing security interest in and to all of
Borrower's assets, whether presently existing or hereafter arising or acquired,
and (ii) that certain Collateral Assignment of Trademarks dated as of October 5,
1994 (the "Trademarks Assignment"), pursuant to which Borrower has collaterally
assigned to Bank all of Borrower's right, title and interest in, to and under
all trademarks, trademark licenses and certain related assets, whether presently
existing or hereafter arising or acquired.

                                   -13-
<PAGE>
 
     4.2  Delivery of Additional Documentation Required.   Borrower shall from
          ---------------------------------------------                       
time to time execute and deliver to Bank, at the request of Bank, all Negotiable
Collateral, all financing statements and other documents that Bank may
reasonably request, in form satisfactory to Bank, to perfect and continue
perfected Bank's security interest in the Collateral and in order to fully
consummate all of the transactions contemplated under the Loan Documents.

     5.  REPRESENTATIONS AND WARRANTIES
         ------------------------------

     Borrower represents and warrants as follows:

     5.1  Due Organization and Qualification.  Borrower and each Subsidiary is a
          -----------------------------------                                 
corporation duly existing and in good standing under the laws of its state of
incorporation and qualified and licensed to do business in, and is in good
standing in, any state in which the conduct of its business or its ownership of
property requires that it be so qualified.

     5.2  Due Authorization: No Conflict.  The execution, delivery, and
          -------------------------------                               
performance of the Loan Documents are within Borrower's powers, have been duly
authorized, and are not in conflict with nor constitute a breach of any
provision contained in Borrower's Certificate of Incorporation or Bylaws, nor
will they constitute an event of default under any material agreement to which
Borrower is a party or by which Borrower is bound.  Borrower is not in default
under any agreement to which it is a party or by which it is bound, which
default could have a Material Adverse Effect.

     5.3  No Prior Encumbrances.  Borrower has good and indefeasible title to 
          ----------------------                                                
the Collateral, free and clear of Liens, except for Permitted Liens.

     5.4  Bona Fide Eligible Accounts.  The Eligible Accounts are bona fide
          ----------------------------                                      
existing obligations.  The property giving rise to such Eligible Accounts has
been delivered to the account debtor or to the account debtor's agent for
immediate shipment to and unconditional acceptance by the account debtor.
Borrower has not received notice of actual or imminent Insolvency Proceeding of
any account debtor that is included in any Borrowing Base Certificate as an
Eligible Account.

     5.5  Merchantable Inventory.  All Inventory is in all material respects of
          -----------------------                                               
good and marketable quality, free from all material defects.

     5.6  Name: Location of Chief Executive Office.  Except as disclosed in the
          -----------------------------------------                             
Schedule, Borrower has not done business under any name other than that
specified on the signature page hereof.  The chief executive office of Borrower
is located at the address indicated in Section 11 hereof.

     5.7  Litigation.  Except as set forth in the Schedule, there are no actions
          -----------  
or proceedings pending by or against Borrower or any Subsidiary before any court
or administrative agency in which an adverse decision could have a Material
Adverse Effect or a material adverse 

                                    -14-

<PAGE>
 
effect on Borrower's interest or Bank's security interest in the Collateral.
Borrower does not have knowledge of any such pending or threatened actions or
proceedings.

     5.8  No Material Adverse Change in Financial Statements.  All consolidated
          ---------------------------------------------------                   
financial statements related to Borrower and any Subsidiary that have been
delivered by Borrower to Bank fairly present in all material respects Borrower's
consolidated financial condition as of the date thereof and Borrower's
consolidated results of operations for the period then ended.  There has not
been a material adverse change in the consolidated financial condition of
Borrower since the date of the most recent of such financial statements
submitted to Bank.

     5.9  Solvency.  Borrower is solvent and able to pay its debts (including
         ---------                                                           
trade debts) as they mature.

     5.10  Regulatory Compliance.  Borrower and each Subsidiary has met the
           ----------------------   
minimum funding requirements of ERISA with respect to any employee benefit plans
subject to ERISA.  No event has occurred resulting from Borrower's failure to
comply with ERISA that is reasonably likely to result in Borrower's incurring
any liability that could have a Material Adverse Effect.  Borrower is not an
"investment company" or a company "controlled" by an "investment company" within
the meaning of the Investment Company Act of 1940, as amended.  Borrower is not
engaged principally, or as one of the important activities, in the business of
extending credit for the purpose of purchasing or carrying margin stock (within
the meaning of Regulations G, T and U of the Board of Governors of the Federal
Reserve System).  Borrower has complied with all the provisions of the Federal
Fair Labor Standards Act.  Borrower has not violated any statutes, laws,
ordinances or rules applicable to it, violation of which could have a Material
Adverse Effect.

     5.11  Environmental Condition.  None of Borrower's or any Subsidiary's
           ------------------------                                          
properties or assets has ever been used by Borrower or any Subsidiary or, to the
best of Borrower's knowledge, by previous owners or operators, in the disposal
of or to produce, store, handle, treat, release, or transport, any hazardous
waste or hazardous substance other than in accordance with applicable law; to
the best of Borrower's knowledge, none of Borrower's properties or assets has
ever been designated or identified in any manner pursuant to any environmental
protection statute as a hazardous waste or hazardous substance disposal site, or
a candidate for closure pursuant to any environmental protection statute; no
lien arising under any environmental protection statute has attached to any
revenues or to any real or personal property owned by Borrower or any
Subsidiary; and neither Borrower nor any Subsidiary has received a summons,
citation, notice, or directive from the Environmental Protection Agency or any
other federal, state or other governmental agency concerning any action or
omission by Borrower or any Subsidiary resulting in the releasing, or otherwise
disposing of hazardous waste or hazardous substances into the environment.

     5.12  Taxes.  Borrower and each Subsidiary has filed or caused to be filed
           ------                                                               
all tax returns required to be filed, and has paid, or has made adequate
provision for the payment of, all taxes reflected therein.

                                  -15-
<PAGE>
 
     5.13  Subsidiaries.  Borrower does not own any stock, partnership 
           ------------- 
interest or other equity securities of any Person, except for Permitted 
Investments.

     5.14  Government.  Borrower and each Subsidiary has obtained all consents,
           -----------                                                          
approvals and authorizations of, made all declarations or filings with, and
given all notices to, all governmental authorities that are necessary for the
continued operation of Borrower's business as currently conducted.

     5.15  Full Disclosure.  No representation, warranty or other statement made
           ----------------  
by Borrower in any certificate or written statement furnished to Bank contains
any untrue statement of a material fact or omits to state a material fact
necessary in order to make the statements contained in such certificates or
statements not misleading.

     6.  AFFIRMATIVE COVENANTS
         ---------------------

     Borrower covenants and agrees that, until payment in full of all
outstanding Obligations, and for so long as Bank may have any commitment to make
any Loan hereunder, Borrower shall do all of the following:

     6.1  Good Standing.  Borrower shall maintain its and each of its
          --------------                                              
Subsidiaries' corporate existence and good standing in its jurisdiction of
incorporation and maintain qualification in each jurisdiction in which the
failure to so qualify could have a Material Adverse Effect.  Borrower shall
maintain, and shall cause each of its Subsidiaries to maintain, to the extent
consistent with prudent management of Borrower's business, in force all
licenses, approvals and agreements, the loss of which could have a Material
Adverse Effect.

     6.2  Government Compliance.  Borrower shall meet, and shall cause each
          ----------------------                                            
Subsidiary to meet, the minimum funding requirements of ERISA with respect to
any employee benefit plans subject to ERISA.  Borrower shall comply, and shall
cause each Subsidiary to comply, with all statutes, laws, ordinances and
government rules and regulations to which it is subject, noncompliance with
which could have a Material Adverse Effect or a material adverse effect on the
Collateral or the priority of Bank's Lien on the Collateral.

     6.3  Financial Statements, Reports, Certificates.  Borrower shall deliver 
          --------------------------------------------     
to Bank: (a) as soon as available, but in any event within thirty (30) days
after the end of each mouth, a company prepared consolidated balance sheet and
income statement covering Borrower's consolidated operations during such period,
certified by an officer of Borrower reasonably acceptable to Bank; (b) as soon
as available, but in any event within one hundred twenty (120) days after the
end of Borrower's fiscal year, audited consolidated financial statements of
Borrower prepared in accordance with GAAP, consistently applied, together with
an unqualified opinion on such financial statements of an independent certified
public accounting firm reasonably acceptable to Bank; (c) within five (5) days
of filing, copies of all statements, reports and notices sent or made available
generally by Borrower to its security holders or to any holders of Subordinated
Debt and all reports on Form 10-K, 10-Q and 8-K filed with the 

                                   -16-
<PAGE>
 
Securities and Exchange Commission; (d) promptly upon receipt of notice thereof,
a report of any legal actions pending or threatened against Borrower or any
Subsidiary that could result in damages or costs to Borrower or any Subsidiary
of One Hundred Thousand Dollars ($100,000) or more in the aggregate; and (e)
such budgets, sales projections, operating plans or other financial information
as Bank may reasonably request from time to time.

     Within twenty-five (25) days after the last day of each month, Borrower
shall deliver to Bank a Borrowing Base Certificate signed by a Responsible
Officer in substantially the form of Exhibit B hereto, together with aged
                                     ---------                           
listings of accounts receivable and accounts payable.

     Within thirty (30) days after the last day of each month, Borrower shall
deliver to Bank with the monthly financial statements a Compliance Certificate
signed by a Responsible Officer in substantially the form of Exhibit C hereto.
                                                             ---------        

     Bank shall have a right from time to time hereafter to audit Borrower's
Accounts at Borrower's expense; provided that such audits will be conducted no
more often than every twelve (12) months unless an Event of Default has occurred
and is continuing.

     6.4  Inventory; Returns.  Borrower shall keep all Inventory in good and
          -------------------                                                
marketable condition, free from any material defects.  Returns and allowances,
if any, as between Borrower and its account debtors shall be on the same basis
and in accordance with the usual customary practices of Borrower, as they exist
at the time of the execution and delivery of this Agreement.  Borrower shall
promptly notify Bank of all returns and recoveries and of all disputes and
claims, where the return, recovery, dispute or claim involves more than Fifty
Thousand Dollars ($50,000).

     6.5  Taxes.  Borrower shall make, and shall cause each Subsidiary to make,
          ------                                                                
due and timely payment or deposit of all material federal, state, and local
taxes, assessments, or contributions required of it by law, and will execute and
deliver to Bank, on demand, appropriate certificates attesting to the payment or
deposit thereof; and Borrower will make, and will cause each Subsidiary to make,
timely payment or deposit of all material tax payments and withholding taxes
required of it by applicable laws, including, but not limited to, those laws
concerning, F.I.C.A., F.U.T.A, state disability, and local, state, and federal
income taxes, and will, upon request, furnish Bank with proof satisfactory to
Bank indicating that Borrower or a Subsidiary has made such payments or
deposits; provided that Borrower or a Subsidiary need not make any payment if
the amount or validity of such payment is contested in good faith by appropriate
proceedings and is reserved against (to the extent required by GAAP) by
Borrower.

     6.6  Insurance.
          ---------- 

     (a) Borrower, at its expense, shall keep the Collateral insured against
loss or damage by fire, theft, explosion, sprinklers, and all other hazards and
risks, and in such amounts, as ordinarily insured against by other owners in
similar businesses conducted in the 

                                   -17-
<PAGE>
 
locations where Borrower's business is conducted on the date hereof.  Borrower
shall also maintain insurance relating to Borrower's ownership and use of the
Collateral in amounts and of a type that are customary to businesses similar to
Borrower's.

     (b) All such policies of insurance shall be in such form with such
companies, and in such amounts as reasonably satisfactory to Bank.  All such
policies of property insurance shall contain a lender's loss payable
endorsement, in a form satisfactory to Bank, showing Bank as an additional loss
payee thereof and all liability insurance policies shall show the Bank as an
additional insured, and shall specify that the insurer must give at least twenty
(20) days' notice to Bank before canceling its policy for any reason.  Borrower
shall deliver to Bank certified copies of such policies of insurance and
evidence of the payments of all premiums therefor.  All proceeds payable under
any such policy shall, at the option of Bank, be payable to Bank to be applied 
on account of the Obligations.

     6.7  Principal Depository.  Borrower shall maintain its principal 
          --------------------- 
depository and operating accounts with Bank.

     6.8  Quick Ratio.  Borrower shall maintain, as of the last day of each
          ------------                                                      
calendar month, a ratio of Quick Assets to Current Liabilities of at least 1.5
to 1.O.

     6.9  Tangible Net Worth.  Borrower shall maintain, as of the last day of
          -------------------                                                 
each fiscal quarter, a Tangible Net Worth of not less than eighty percent (80%)
of aggregate net invested capital received from and after the date of this
Agreement.

     6.10  Debt-Net Worth Ratio.  Borrower shall maintain, as of the last day of
           ---------------------  
each calendar month, a ratio of Total Liabilities to Tangible Net Worth of not
more than 1.0 to 1.0.

     6.11 Liquidity.  Borrower shall maintain, as of the last day of each 
          ----------             
calendar month, (1) unrestricted cash (and equivalents), plus (ii) Eligible
Accounts, minus (iii) outstanding Loans, of not less than two hundred percent
(200%) of Equipment Advances outstanding. The Liquidity covenant set forth in
this Section 6.11 shall continue in effect only until such time as Borrower
initially satisfies the Minimum Debt Service covenant set forth in Section 6.12.

     6.12  Minimum Debt Service.  Borrower shall maintain, as of the end of each
           --------------------- 
fiscal quarter, a Debt Service ratio of at least 1.25 to 1.00.  "Debt Service"
is defined as net after tax earnings plus interest, depreciation and
amortization, divided by total interest plus current portion of long term debt
and current portion of capitalized lease obligations.

     6.13  Profitability. Borrower shall have minimum net income of One Dollar
           --------------           
($1.00) for each fiscal quarter.

     6.14  Registration of Intellectual Property Rights.  Borrower shall 
           ---------------------------------------------   
register or cause to be registered with the United States Patent and Trademark
Office or the United States Copyright Office, as applicable, intellectual
property rights developed or acquired by Borrower 

                                  -18-
<PAGE>
 
from time to time in connection with any product prior to the sale or licensing
of such product to any third party. Borrower shall execute and deliver such
additional instruments and documents from time to time as Bank shall reasonably
request to perfect Bank's security interest in such intellectual property
rights.

     6.15  Further Assurances. At any time and from time to time Borrower shall
           -------------------  
execute and deliver such further instruments and take such further action as may
reasonably be requested by Bank to effect the purposes of this Agreement.

     7.  NEGATIVE COVENANTS
         ------------------

     Borrower covenants and agrees that, so long as any credit hereunder shall
be available and until payment in full of the outstanding Obligations or for so
long as Bank may have any commitment to make any Loans, Borrower will not do any
of the following:

     7.1  Dispositions.  Convey, sell lease, transfer or otherwise dispose of
          -------------                                                       
(collectively, a "Transfer"), or permit any of its Subsidiaries to Transfer, all
or any part of its business or property, other than: (i) Transfers of Inventory
in the ordinary course of business; (ii) Transfers of non-exclusive licenses and
similar arrangements for the use of the property of Borrower or its
Subsidiaries; or (iii) Transfers of worn-out or obsolete Equipment.

     7.2  Change in Business.  Engage in any business, or permit any of its
          -------------------                                               
Subsidiaries to engage in any business, other than the businesses currently
engaged in by Borrower and any business substantially similar or related thereto
(or incidental thereto), or suffer a material change in Borrower's ownership,
management or directors.  Borrower will not, without thirty (30) days' prior
written notification to Bank, relocate its chief executive office.

     7.3  Mergers or Acquisitions.  Merge or consolidate, or permit any of its
          ------------------------                                             
Subsidiaries to merge or consolidate, with or into any other business
organization, or acquire, or permit any of its Subsidiaries to acquire, all or
substantially all of the capital stock or property of another Person.

     7.4  Indebtedness.  Create, incur, assume or be or remain liable with
          -------------                                                    
respect to any Indebtedness, or permit any Subsidiary so to do, other than
Permitted Indebtedness.

     7.5  Encumbrances.  Create, incur, assume or suffer to exist any Lien with
          -------------                                                         
respect to any of its property, or assign or otherwise convey any right to
receive income, including the sale of any Accounts, or permit any of its
Subsidiaries so to do, except for Permitted Liens.

     7.6  Distributions. Pay any dividends or make any other distribution or
          --------------                                                     
payment on account of or in redemption, retirement or purchase of any capital
stock.

                                   -19-
<PAGE>
 
     7.7  Investments.  Directly or indirectly acquire or own, or make any
          ------------                                                     
Investment in or to any Person, or permit any of its Subsidiaries so to do,
other than Permitted Investments.

     7.8  Transactions with Affiliates.  Directly or indirectly enter into or
          -----------------------------                                       
permit to exist any material transaction with any Affiliate of Borrower except
for transactions that are in the ordinary course of Borrower's business, upon
fair and reasonable terms that are no less favorable to Borrower than would be
obtained in an arm's length transaction with a nonaffiliated Person.

     7.9  Subordinated Debt.  Make any payment in respect of any Subordinated
          ------------------                                                  
Debt, or permit any of its Subsidiaries to make any such payment, except in
compliance with the terms of such Subordinated Debt, or amend any provision
contained in any documentation relating to the Subordinated Debt without Bank's
prior written consent.

     7.10  Inventory.  Store the Inventory with a bailee, warehouseman, or 
           ----------                      
similar party unless Bank has received a pledge of the warehouse receipt
covering such Inventory. Except for Inventory sold in the ordinary course of
business and except for such other locations as Bank may approve in writing,
Borrower shall keep the Inventory only at the location set forth in Section 11
hereof and such other locations of which Borrower gives Bank prior written
notice and as to which Borrower signs and files a financing statement where
needed to perfect Bank's security interest.

     7.11  Compliance.  Become an "investment company" or a company "controlled"
           -----------    
by an "investment company," within the meaning of the Investment Company Act of
1940, as amended, or become principally engaged in, or undertake as one of its
important activities, the business of extending credit for the purpose of
purchasing or carrying margin stock, or use the proceeds of any Advance for such
purpose.  Fail to meet the minimum funding requirements of ERISA, permit a
"Reportable Event" or "Prohibited Transaction", as defined in ERISA, to occur,
fail to comply with the Federal Fair Labor Standards Act or violate any law or
regulation, which violation could have a Material Adverse Effect or a material
adverse effect on the Collateral or the priority of Bank's Lien on the
Collateral or permit any of its Subsidiaries to do any of the foregoing.

     8.  EVENTS OF DEFAULT
         -----------------

     Any one or more of the following events shall constitute an Event of
Default by Borrower under this Agreement:

     8.1  Payment Default.  If Borrower fails to pay, when due, any of the
          ----------------                                                 
Obligations;

     8.2  Covenant Default.
          ----------------- 

                                     -20-
<PAGE>
 
     (a) If Borrower fails to perform any obligation under Sections 6.7, 6.8,
6.9, 6.10, 6.11, 6.12 or 6.13 or violates any of the covenants contained in
Article 7 of this Agreement, or

     (b) If Borrower fails or neglects to perform, keep, or observe any other
material term, provision, condition, covenant, or agreement contained in this
Agreement or in any of the other Loan Documents and as to any default under such
other term, provision, condition, covenant or agreement that can be cured, has
failed to cure such default within ten (10) days after Borrower receives notice
thereof or any officer of Borrower becomes aware thereof, provided, however,
that if the default cannot by its nature be cured within the ten (10) day period
or cannot after diligent attempts by Borrower be cured within such ten (10) day
period, and such default is likely to be cured within a reasonable time, then
Borrower shall have an additional reasonable period (which shall not in any case
exceed thirty (30) days) to attempt to cure such default, and within such
reasonable time period the failure to have cured such default shall not be
deemed an Event of Default (provided that no Loans will be required to be made
during such cure period), or

     (c) If a default occurs under any other present or future agreement between
Borrower and Bank, and such default has not been expressly waived in writing,
permits the acceleration of debt issued or otherwise created pursuant thereto,
or if any such debt is declared due and payable prior to the stated maturity
thereof or is not paid in full at the stated maturity thereof;

     8.3  Material Adverse Developments.  If (i) there occurs a material
          ------------------------------                                 
impairment of the perfection or priority of the Bank's security interest in the
Collateral or of the value of such Collateral which is not covered by adequate
insurance or (ii) the Bank determines, based upon information available to it
and in the exercise of its reasonable judgment, that there is a reasonable
likelihood that Borrower will fail to comply with one or more of the financial
covenants set forth on Section 6 during the next succeeding financial reporting
period;

     8.4  Attachment.  If any material portion of Borrower's assets is attached,
          ----------- 
seized, subjected to a writ or distress warrant, or is levied upon, or comes
into the possession of any trustee, receiver or person acting in a similar
capacity and such attachment, seizure, writ or distress warrant or levy has not
been removed, discharged or rescinded within ten (10) days, or if Borrower is
enjoined, restrained, or in any way prevented by court order from continuing to
conduct all or, any material part of its business affairs, or if a judgment or
other claim becomes a lien or encumbrance upon any material portion of
Borrower's assets, or if a notice of lien, levy, or assessment is filed of
record with respect to any of Borrower's assets by the United States Government,
or any department, agency, or instrumentality thereof, or by any state, county,
municipal or governmental agency, and the same is not paid within ten (10) days
after Borrower receives notice thereof, provided that none of the foregoing
shall constitute an Event of Default where such action or event is stayed or an
adequate bond has been posted pending a good faith contest by Borrower (provided
that no Loans will be required to be made during such cure period);

                                   -21-
<PAGE>
 
     8.5  Insolvency.  If Borrower becomes insolvent, or if an Insolvency
          -----------                                                     
Proceeding is commenced by Borrower, or if an Insolvency Proceeding is commenced
against Borrower and is not dismissed or stayed within ten (10) days (provided
that no Loans will be made prior to the dismissal of such Insolvency
Proceeding);

     8.6  Other Agreements.  If there is a default in any agreement to which
          -----------------                                                  
Borrower is a party with a third party or parties resulting in a right by such
third party or parties, whether or not exercised, to accelerate the maturity of
any Indebtedness in an amount in excess of One Hundred Thousand Dollars
($100,000) in the aggregate or that could have a Material Adverse Effect;

     8.7  Subordinated Debt.  If Borrower makes any payment on account of
          ------------------                                              
Subordinated Debt, except to the extent such payment is allowed under any
subordination agreement entered into with Bank;

     8.8  Judgments.  If a judgment or judgments for the payment of money in an
          ----------                                                            
amount, individually or in the aggregate, of at least Fifty Thousand Dollars
($50,000) shall be rendered against Borrower and shall remain unsatisfied and
unstayed for a period of ten (10) days (provided that no Loans will be made
prior to the satisfaction or stay of such judgment);

     8.9  ERISA. If Borrower or any member of the Controlled Group fails to pay
          ------                                                                
when due an amount or amounts aggregating in excess of $100,000 which it is
obligated to pay to the PBGC or to a Plan under Title IV of ERISA; or a notice
of intent to terminate a Plan or Plans having aggregate Unfunded Liabilities in
excess of $100,000 shall be filed under Title IV of ERISA by Borrower or any
member of the Controlled Group, any plan administrator or any combination of the
foregoing; or the PBGC shall institute proceedings under Title IV of ERISA to
terminate or to cause a trustee to be appointed to administer any such Plan or
Plans or a proceeding shall be instituted by a fiduciary of any such Plan or
Plans against Borrower or any member of the Controlled Group to enforce Sections
515 or 4219(c)(5) of ERISA; or a condition exist by reason of which the PBGC
would be entitled to obtain a decree adjudicating that any such Plan or Plans
must be terminated; or there shall occur a complete or partial withdrawal from,
or a default, within the meaning of Section 4219(c)(5) of ERISA, with respect
to, one or more Multiemployer Plans which could cause Borrower or one or more
members of the Controlled Group to incur a current payment obligation in excess
of $100,000; or

     8.10  Misrepresentations.  If any material misrepresentation or material
           ------------------                                                
misstatement exists now or hereafter in any warranty or representation set forth
herein or in any certificate delivered to Bank by any Responsible Officer
pursuant to this Agreement or to induce Bank to enter into this Agreement or any
other Loan Document.

     9.  BANK'S RIGHTS AND REMEDIES
         --------------------------

                                    -22-
<PAGE>
 
     9.1  Rights and Remedies. Upon the occurrence and during the continuance of
          --------------------  
an Event of Default, Bank may, at its election, without notice of its election
and without demand, do any one or more of the following, all of which are
authorized by Borrower:

     (a) Declare all Obligations, whether evidenced by this Agreement, by any of
the other Loan Documents, or otherwise, immediately due and payable (provided
that upon the occurrence of an Event of Default described in Section 8.5 all
Obligations shall become immediately due and payable without any action by
Bank);

     (b) Cease advancing money or extending credit to or for the benefit of
Borrower under this Agreement or under any other agreement between Borrower and
Bank;

     (c) Without notice to or demand upon Borrower, make such payments and do
such acts as Bank considers necessary or reasonable to protect its security
interest in the Collateral;

     (d) Exercise all of its rights and remedies available to it hereunder,
under the other Loan Documents (including, without limitation, the Security
Agreement and the Trademarks Assignment), at law and in equity;

     (e) Without notice to Borrower set off and apply to the Obligations any and
all (i) balances and deposits of Borrower held by Bank, or (ii) indebtedness at
any time owing to or for the credit or the account of Borrower held by Bank.

     9.2  Power of Attorney. Effective only upon the occurrence and during the
          ------------------                                                   
continuance of an Event of Default, Borrower hereby irrevocably appoints Bank
(and any of Bank's designated officers or employees) as Borrower's true and
lawful attorney to: (a) send requests for verification of Accounts or notify
account debtors of Bank's security interest in the Accounts; (b) endorse
Borrower's name on any checks or other forms of payment or security that may
come into Bank's possession; (c) sign Borrower's name on any invoice or bill of
lading relating to any Account, drafts against account debtors, schedules and
assignments of Accounts, verifications of Accounts, and notices to account
debtors; (d) make, settle, and adjust all claims under and decisions with
respect to Borrower's policies of insurance; and (e) settle and adjust disputes
and claims respecting the accounts directly with account debtors, for amounts
and upon terms which Bank determines to be reasonable; provided Bank may
exercise such power of attorney to sign the name of Borrower on any of the
documents described in Section 4.2 regardless of whether an Event of Default has
occurred. The appointment of Bank as Borrower's attorney in fact, and each and
every one of Bank's rights and powers, being coupled with an interest, is
irrevocable until all of the Obligations have been fully repaid and performed
and Bank's obligation to provide advances hereunder is terminated.

     9.3  Bank Expenses.  If Borrower fails to pay any amounts or furnish any
          -------------
required proof of payment due to third persons or entities, as required under
the terms of this Agreement,
                                    -23-
<PAGE>
 
then Bank may do any or all of the following: (a) make payment of the same or
any part thereof; (b) set up such reserves under the Committed Revolving Line as
Bank deems necessary to protect Bank from the exposure created by such failure;
or (c) obtain and maintain insurance policies of the type discussed in Section
6.6 of this Agreement, and take any action with respect to such policies as Bank
deems prudent. Any amounts so paid or deposited by Bank shall constitute Bank
Expenses, shall be immediately due and payable, and shall bear interest at the
then applicable rate hereinabove provided, and shall be secured by the
Collateral. Any payments made by Bank shall not constitute an agreement by Bank
to make similar payments in the future or a waiver by Bank of any Event of 

Default under this Agreement.

     9.4  Remedies Cumulative.  Bank's rights and remedies under this Agreement,
          --------------------  
the Loan Documents, and all other agreements shall be cumulative.  Bank shall
have all other rights and remedies not inconsistent herewith as provided under
the Code, by law or in equity.  No exercise by Bank of one right or remedy shall
be deemed an election, and no waiver by Bank of any Event of Default on
Borrower's part shall be deemed a continuing waiver.  No delay by Bank shall
constitute a waiver, election, or acquiescence by it.  No waiver by Bank shall
be effective unless made in a written document signed on behalf of Bank and then
shall be effective only in the specific instance and for the specific purpose
for which it was given.

     9.5  Demand; Protest.  Borrower waives demand, protest, notice of protest,
          ----------------                                                      
notice of default or dishonor, notice of payment and nonpayment, notice of any
default, nonpayment at maturity, release, compromise, settlement, extension, or
renewal of accounts, documents, instruments, chattel paper, and guarantees at
any time held by Bank on which Borrower may in any way be liable.

     10.  NOTICES
          -------

     Unless otherwise provided in this Agreement, all notices or demands by any
party relating to this Agreement or any other agreement entered into in
connection herewith shall be in writing and (except for financial statements and
other informational documents which may be sent by first-class mail, postage
prepaid) shall be personally delivered or sent by a recognized overnight
delivery service, certified mail, postage prepaid, return receipt requested, or
by telefacsimile to Borrower or to Bank, as the case may be, at its addresses
set forth below:

If to Borrower    Lightbridge, Inc.
                  281 Winter Street
                  Waltham MA 02154
                  Attn: William G. Brown, Chief Financial 
                  Officer
                  FAX: (617) 890-2681

                                    -24-
<PAGE>
 
If to Bank    Silicon Valley East,
              a Division of Silicon Valley Bank
              40 William Street, Suite 350
              Wellesley, MA 02181
              Attn: Pamela J. Lowe, Vice President
              FAX: (617) 431-9906

     The parties hereto may change the address at which they are to receive
notices hereunder, by notice in writing in the foregoing manner given to the
other.

     11.   CHOICE OF LAW AND VENUE: JURY TRIAL WAIVER
           ------------------------------------------

     This Agreement shall be governed by, and contained in accordance with, the
internal laws of The Commonwealth of Massachusetts, without regard to principles
of conflicts of law.  BORROWER ACCEPTS FOR ITSELF AND IN CONNECTION WITH ITS
PROPERTIES, UNCONDITIONALLY, THE NON-EXCLUSIVE JURISDICTION OF ANY STATE OR
FEDERAL COURT OF COMPETENT JURISDICTION IN THE COMMONWEALTH OF MASSACHUSETTS IN
ANY ACTION, SUIT OR PROCEEDING OF ANY KIND AGAINST IT WHICH ARISES OUT OF OR BY
REASON OF THIS AGREEMENT; PROVIDED, HOWEVER, THAT IF FOR ANY REASON BANK CANNOT
AVAIL ITSELF OF nm COURTS OF THE COMMONWEALTH OF MASSACHUSETTS, BORROWER ACCEPTS
JURISDICTION OF THE COURTS AND VENUE IN SANTA CLARA COUNTY, CALIFORNIA.
BORROWER AND BANK EACH HEREBY WAIVE THEIR RESPECTIVE RIGHTS TO A JURY TRIAL OF
ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF ANY OF THE LOAN
DOCUMENTS OR ANY OF THE TRANSACTIONS CONTEMPLATED THEREIN, INCLUDING CONTRACT
CLAIMS, TORT CLAIMS, BREACH OF DUTY CLAIMS, AND ALL OTHER COMMON LAW OR
STATUTORY CLAIMS.  EACH PARTY RECOGNIZES AND AGREES THAT THE FOREGOING WAIVER
CONSTITUTES A MATERIAL INDUCEMENT FOR IT TO ENTER INTO THIS AGREEMENT.  EACH
PARTY REPRESENTS AND WARRANTS THAT IT HAS REVIEWED THIS WAIVER WITH ITS LEGAL
COUNSEL AND THAT IT KNOWINGLY AND VOLUNTARILY WAIVES ITS JURY TRIAL RIGHTS
FOLLOWING CONSULTATION WITH LEGAL COUNSEL,

     12.  GENERAL PROVISIONS
          ------------------

     12.1  Successors and Assigns.  This Agreement shall bind and inure to the
           -----------------------                                             
benefit of the respective successors and permitted assigns of each of the
parties; provided, however, that neither this Agreement nor any rights hereunder
         --------  -------
may be assigned by Borrower without Bank's prior written consent, which consent
may be granted or withheld in Bank's sole discretion.  Bank shall have the right
without the consent of or notice to Borrower to sell transfer, negotiate, or
gant participation in all or any part of, or any interest in, Bank's obligation
rights and benefits hereunder.

                                    -25-
<PAGE>
 
     12.2  Indemnification.  Borrower shall defend, indemnity and hold harmless
           ----------------                                                     
Bank and its officers, employees, and agents against: (a) all obligations,
demands, claims, and liabilities claimed or asserted by any other party in
connection with the transactions contemplated by this Agreement; and (b) all
losses or Bank Expenses in any way suffered, incurred, or paid by Bank as a
result of or in any way arising out of, following, or consequential to
transactions between Bank and Borrower whether under this Agreement, or
otherwise (including, without limitation, reasonable attorneys fees and
expenses), except for losses caused by Bank's gross negligence or willful 
misconduct.

     12.3  Time of Essence.  Time is of the essence for the performance of all
           ----------------                                                    
obligations set forth in this Agreement.

     12.4  Severability of Provisions.  Each provision of this Agreement shall 
           ---------------------------     
be severable from every other provision of this Agreement for the purpose of
determining the legal enforceability of any specific provision.

     12.5  Amendments in Writing; Integration.  This Agreement cannot be amended
           -----------------------------------    
or terminated orally.  All prior agreements, understandings, representations,
warranties, and negotiations between the parties hereto with respect to the
subject matter of this Agreement, if any, are merged into this Agreement and the
Loan Documents.

     12.6  Counterparts.  This Agreement may be executed in any number of
           -------------                                                  
counterparts and by different parties on separate counterparts, each of which,
when executed and delivered, shall be deemed to be an original, and all of
which, when taken together, shall constitute but one and the same Agreement.

     12.7  Survival.  All covenants, representations and warranties made in this
           ---------  
Agreement shall continue in full force and effect so long as any Obligations
remain outstanding.  The obligations of Borrower to indemnify Bank with respect
to the expenses, damages, losses, costs and liabilities described in Section
12.2 shall survive until all applicable statute of limitations periods with
respect to actions that may be brought against Bank have run, provided that so
long as the obligations set forth in the first sentence of this Section 12.7
have been satisfied, and Bank has no commitment to make any Loans or to make any
other loans to Borrower, Bank shall release all security interests granted
hereunder and redeliver all Collateral held by it in accordance with applicable
law.

     12.8  Confidentiality.  In handling any confidential information Bank shall
           ----------------  
exercise the same degree of care that it exercises with respect to its own
proprietary information of the same types to maintain the confidentiality of any
non-public information thereby received or received pursuant to this Agreement
except that disclosure of such information may be made (i) to the subsidiaries
or affiliates of Bank in connection with their present or prospective business
relations with Borrower, (ii) to prospective transferees or purchasers of any
interest in the Loans, provided that they have entered into a comparable
confidentiality agreement in favor of Borrower and have delivered a copy to
Borrower, (iii) as required by law, regulations, rule or order, 

                                 -26-
<PAGE>
 
subpoena, judicial order or similar order and (iv) as may be required in
connection with the examination, audit or similar investigation of Bank.
Confidential information hereunder shall not include information that either:
(a) is in the public domain or in the knowledge or possession of Bank when
disclosed to Bank, or becomes part of the public domain after disclosure to Bank
through no fault of Bank; or (b) is disclosed to Bank by a third party, provided
Bank does not have actual knowledge that such third party is prohibited from
disclosing such information.

     12.9  Countersignature.  This Agreement shall become effective only when it
           -----------------  
shall have been executed by Borrower and Bank (provided, however, in no event
shall this Agreement become effective until signed by an officer of Bank in
California).

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


                              LIGHTBRIDGE, INC.

                              By: /s/ William G. Brown
                                 -----------------------------
                              Name:  William G. Brown
                                   --------------------------
                              Title:  CEO/VP Finance
                                    ------------------------- 


                              SILICON VALLEY BANK, doing business
                              as SILICON VALLEY EAST


                              By: /s/ Pamela J. Lowe
                                 -----------------------------
                              Name: Pamela J. Lowe
                                   ---------------------------
                              Title: Vice President
                                    --------------------------

                              SILICON VALLEY BANK


                              By:_____________________________
                              Name:___________________________
                              Title:__________________________
                              (signed in Santa Clara County, California)

                                     -27-
<PAGE>
 
                               LIGHTBRIDGE, INC.

                             Schedule of Exceptions
                             ----------------------


Permitted Investments
- ---------------------

     The Borrower owns 50% of the capital stock of BGX, Inc., a Delaware
corporation.  BGX, Inc. is currently inactive.

Permitted Indebtedness
- ----------------------

     The Borrower has borrowed an aggregate of $2,100,000 pursuant to the terms
of a Subordinated Note and Warrant Purchase Agreement dated as of August 29,
1994 among the Borrower and the persons listed on the Schedule of Purchasers
thereto.

     Master Lease Agreements between Comdisco, Inc. as lessor and the Borrower
as lessee.  The leases provide for an aggregate of $1,500,000.00 in computer
hardware lines of credit.

     The Borrower rents its office space from independent landlords.  Currently
under lease is approximately 90,000 square feet of space, with an annual lease
payment of $1,502,745.  Leases expire between 1999 and 2001.

Litigation
- ----------

     Mohammad Kammoun, a former employee of the Borrower, has filed a charge of
religious/national origin discrimination with the Massachusetts Commission
Against Discrimination and the Equal Employment Opportunity Commission arising
out of the termination of his employment in October 1994.  The Borrower has
submitted a position statement and an investigative conference was held by the
MCAD on January 10, 1995.  The Borrower is awaiting an initial determination
from the MCAD as to whether there is probable cause to support Mr. Kammoun's
charge.

Use of other names
- ------------------

     In 1994, the Borrower changed its name from "Credit Technologies, Inc."  
to "Lightbridge, Inc."

                                    
<PAGE>
 
                                   EXHIBIT A
                  LOAN PAYMENT/ADVANCE TELEPHONE REQUEST FORM

             DEADLINE FOR SAME DAY PROCESSING IS 3:00 P.M., P.S.T.


TO:  CENTRAL CLIENT SERVICE DIVISION             DATE:

FAX#: (408)                                      TIME:

FROM: ______________________________________________________________________
                                BORROWER'S NAME

FROM: ______________________________________________________________________
                           AUTHORIZED SIGNER'S NAME

____________________________________________________________________________
                             AUTHORIZED SIGNATURE

PHONE: _____________________________________________________________________


FROM ACCOUNT #___________________________  TO ACCOUNT #_____________________

<TABLE>
<CAPTION>

========================================================================= 
    REQUESTED TRANSACTION TYPE                REQUEST DOLLAR AMOUNT
- ----------------------------------            ---------------------
<S>                                          <C>
PRINCIPAL INCREASE (ADVANCE)                  $____________________
PRINCIPAL PAYMENT (ONLY)                      $____________________
INTEREST PAYMENT (ONLY)                       $____________________
PRINCIPAL AND INTEREST (PAYMENT)              $____________________
OTHER INSTRUCTIONS:
========================================================================
</TABLE>

     All representations and warranties of Borrower stated in the Amended and
Restated Credit Agreement dated as of June __, 1996, by and between Borrower and
Silicon Valley Bank are true, correct and complete in all material respects as
of the date of the telephone request for the Advance/Equipment Advance confirmed
by this Borrowing Certificate; provided, however, that those representations
and warranties expressly referring to another date shall be true, correct and
complete in all material respects as of such date.

                                      
<PAGE>
 
============================================================================
                                 BANK USE ONLY
TELEPHONE REQUEST
- ----------------------------------------
The following person is authorized to request the loan payment transfer/loan
 advance on the advance designated account and is known to me.

 
- ----------------------------------------  ---------------------------------
         Authorized Requester                          Phone #
 
 
- ----------------------------------------  ---------------------------------
          Received by (Bank)                           Phone #
 

                      ___________________________________
                          Authorized Signature (Bank)

============================================================================
 
 

                                      -2-
<PAGE>
 
                                   EXHIBIT B
                           BORROWING BASE CERTIFICATE

Borrower:           Lightbridge, Inc.

Bank:               Silicon Valley Bank

Commitment Amount:  $4,000,000
================================================================================
<TABLE>
 
<S>                                                 <C>         <C>
ACCOUNTS RECEIVABLE:
  1.  Accounts Receivable Book Value as of______                 $______
  2.  Additions (please explain on reverse)                      $______
  3.  TOTAL ACCOUNTS RECEIVABLE                                  $______

ACCOUNTS RECEIVABLE DEDUCTIONS (without duplication)
  4.  Amounts over 90 days due                       $______
  5.  Balance of 50% over 90 day accounts            $______
  6.  Concentration Limits                           $______
  7.  Foreign Accounts                               $______
  8.  Government Accounts                            $______
  9.  Contra Accounts                                $______
  10. Promotion or Demo Accounts                     $______
  11. Intercompany/Employee Accounts                 $______
  12. Other (please explain on reverse)              $______
  13. TOTAL ACCOUNTS RECEIVABLE DEDUCTIONS                       $______
  14. Eligible Accounts (#3 minus #13)               $______
  15. LOAN VALUE OF ACCOUNTS (80% OF #14)                        $______
 
INVENTORY
  16. Inventory Value as of                          $ N/A
  17. LOAN VALUE OF INVENTORY (__% OF # 16)          $ N/A

BALANCES
  18. Maximum Loan Amount                            $______
  19. Total Funds Available [Lesser of #18 or 
       (#15 plus #17)]                                           $______
  20. Present balance owing on Line of Credit                    $______
  21. Outstanding under Sublimits 
       (Letters of Credit)                           $______
  22. RESERVE POSITION (#19 minus #2O and #21)                   $______
</TABLE> 

The undersigned represents and warrants that the foregoing is true, complete and
correct, and that the information reflected in this Borrowing Base Certificate
complies with the representations and warranties set forth in the Amended and
Restated Credit Agreement dated as of June ____, 1996 between the undersigned
and Silicon Valley Bank.

                                      
<PAGE>
 
COMMENT:

- -------------------------------


By:____________________________
       Authorized Signer


 
 
 
                                                       BANK USE ONLY

                                             Received by:____________________
                                                          Authorized Signer
 
                                             Date:___________________________
 
                                             Verified:_______________________
                                                         Authorized Signer
 
                                             Date:___________________________
 

                                      -2-
<PAGE>
 
                                   EXHIBIT C
                             COMPLIANCE CERTIFICATE

TO:       SILICON VALLEY BANK ("Bank")

FROM:     LIGHTBRIDGE, INC. ("Borrower")


     The undersigned authorized officer of Lightbridge, Inc. hereby certifies
that in accordance with the terms and conditions of the Amended and Restated
Credit Agreement dated as of June ___, 1996 between Borrower and Bank (the
"Agreement"), (i) Borrower is in complete compliance for the period ending 
___________ with all required covenants except as noted below and (ii) all
representations and warranties of Borrower stated in the Agreement are true and
correct in all material respects as of the date hereof. Attached herewith are
the required documents supporting the above certification. The Officer further
certifies that these are prepared in accordance with Generally Accepted
Accounting Principles (GAAP) and are consistently applied from one period to the
next except as explained in an accompanying letter or footnotes. The Officer
expressly acknowledges that no borrowings may be requested by the Borrower at
any time or date of determination that Borrower is not in compliance with any of
the terms of the Agreement, and that such compliance is determined not just at
the date this certificate is delivered.

     Please indicate compliance status by circling Yes/No under "Complies"
column.

<TABLE>
<CAPTION>
 
Reporting Covenant                         Required                 Complies
- ----------------------------------- ----------------------          --------
<S>                                 <C>                             <C>  
                                   
Monthly financial statements        Monthly within 30 days          Yes   No
Annual (CPA Audited)                FYE within 120 days             Yes   No
A/R & A/P Agings                    Monthly within 25 days          Yes   No
Borrowing Base Certificate          Monthly within 25 days          Yes   No
A/R Audit                           Annual                          Yes   No
                                   
Financial Covenant                  Required            Actual      Complies
- ----------------------------------- ------------------- ------      --------
Maintain on a Monthly Basis:       
 Minimum Quick Ratio                1.5:1.0             ____:1.0    Yes   No
Maximum Debt/Tangible Net Worth     1.0:1.0             ____:1.0    Yes   No
Minimum Liquidity                   $______             $_______    Yes   No
                                   
Maintain on a Quarterly Basis:     
  Minimum Tangible Net Worth        $______             $_______    Yes   No
  Minimum Profitability             $1.00               ____:1.0    Yes   No
  Minimum Debt Service              1.25:1.0            ____:1.0    Yes   No

</TABLE>




 
<PAGE>
 


Comments Regarding Exceptions: See Attached


Sincerely,

- --------------------------------
Signature

Title:__________________________

Date:___________________________           

                                                 BANK USE ONLY

                                   Received by:________________________
                                                 Authorized Signer

                                   Date:_______________________________

                                   Verified:___________________________
                                                 Authorized Signer

                                   Date:_______________________________

                                   Compliance Status:   Yes      No




<PAGE>
 
                                                                    Exhibit 10.5
 
                              SETTLEMENT AGREEMENT
                              --------------------



     This Settlement Agreement ("Agreement") is made and effective the 2nd day
of February, 1996, by and among Lightbridge, Inc., f/k/a Credit Technologies,
Inc., BEB, Inc., BEB Limited Partnership I, BEB Limited Partnership II, BEB
Limited Partnership III, and BEB Limited Partnership IV, and all of their
predecessors, successors and assigns (collectively, the "Plaintiffs"),
Entrepreneurial, Inc., Entrepreneurial Limited Partnership VI (together with the
Plaintiffs, the "Plaintiffs and Related Parties"), Torrence C. Harder
("Harder"), Brian E. Boyle and all of his representatives, assigns, heirs,
executors and administrators and Boyle Corp. and all of its predecessors,
successors and assigns (together, "Boyle" and, together with the Plaintiffs,
Related Parties and Harder, the "Settlement Agreement Parties").


                              W I T N E S S E T H
                              - - - - - - - - - -


     WHEREAS, there is pending in the Middlesex Superior Court in the
Commonwealth of Massachusetts a civil action in which the Plaintiffs and Brian
E. Boyle (together, the "Litigants") assert claims against each other entitled
                                                                              
Credit Technologies, Inc., BEB, Inc., BEB Limited Partnership I, BEB Limited
- ----------------------------------------------------------------------------
Partnership II, BEB Limited Partnership III, and BEB Limited Partnership IV v.
- ------------------------------------------------------------------------------
Brian E. Boyle, Civil Action No. 94-2983 (the "Civil Action"); and
- --------------                                                    
<PAGE>
 
     WHEREAS, the Litigants entered into a letter agreement on December 28,
1995, as subsequently amended by a letter agreement between the Litigants dated
January 19, 1996, to settle and forever dismiss the Civil Action; and

     WHEREAS, the Settlement Agreement Parties have also agreed to resolve all
claims and disputes between them, including but in no way limited to any and all
claims that were, or could have been, asserted in the Civil Action;

     NOW, therefore, in consideration of the foregoing and for other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the Settlement Agreement Parties agree as follows:

     1.  The closing (the "Closing") of the transactions contemplated hereby
shall occur at the offices of Foley, Hoag & Eliot at 5:00 p.m. on February 29,
1996, which time may be extended by the Plaintiffs and Related Parties to 5:00
p.m. on March 8, 1996 by providing Boyle with written notice of such extension
prior to 5:00 p.m. on February 26, 1996, and which time may be further extended
by mutual agreement among the Settlement Agreement Parties (such time, as it may
be extended as set forth above, is hereinafter referred to as the "Termination
Date") .  Receipt of the requisite approval (the "Approval") by (i) the
partners, as set forth in each of Exhibits A-1, B-1, C-1, D-1 and E-1, of BEB
Limited Partnership I, BEB Limited Partnership II, BEB Limited Partnership III,
BEB Limited Partnership IV and Entrepreneurial Limited Partnership VI of the
amendments to the Limited Partnership Agreements and limited partnership
certificates of such limited partnerships attached hereto as Exhibits A-1 and 
A-2,



                                      -2-
<PAGE>
 
Exhibits B-1 and B-2, Exhibits C-1 and C-2, Exhibits D-1 and D-2, and Exhibits
E-1 and E-2, respectively, (ii) the parties to those certain Agreements Among
Partners among Entrepreneurial, Inc., Torrence C. Harder, D. Quinn Mills, James
I. Cash and Brian E. Boyle, dated July 24, 1989 and January 31, 1991 and that
certain Agreement Among Partners among Entrepreneurial, Inc., Torrence C.
Harder, D. Quinn Mills, James I. Cash and Boyle Corp. dated December 2, 1993 of
the amendments to such Agreements Among Partners attached hereto as Exhibit C-3,
Exhibit D-3 and Exhibit E-3, respectively, and (iii) the parties to that certain
Stock Restiction Agreement dated as of February 11, 1991, as amended on December
19, 1991 and June 9, 1993 by and among CTI (as hereinafter defined), Brian E.
Boyle and certain other parties (the "Stock Restriction Agreement") of the
termination (or amendment so as to have the effect of termination as to Boyle)
of the Stock Restriction Agreement as it pertains to Brian E. Boyle, his
successors and assigns, shall be the only conditions to the obligation of the
Settlement Agreement Parties to consummate the transactions contemplated hereby
at the Closing.  At the Closing, the applicable parties shall execute and
deliver the foregoing documents which are the subject of the Approval, together
with such powers of attorney, signature pages or other similar evidence of due
execution by the limited partners of the partnerships listed above.  If the
Approval is not received by the Termination Date, then the Settlement Agreement
Parties shall have no obligation to consummate the transactions contemplated
hereby, and all rights and obligations of the Settlement Agreement Parties
hereunder shall terminate.



                                      -3-
<PAGE>
 
     2.  At the Closing, counsel for the Litigants shall execute and deliver a
Stipulation of Dismissal in the form attached hereto as Exhibit F.  The fully
executed Stipulation of Dismissal shall be filed, not later than the first
business day following the date of the Closing, in the Middlesex Superior Court
by counsel for the Plaintiffs.  Prior to the Closing, Litigants shall cooperate
to defer and extend until after the Termination Date any motions, discovery or
hearings with respect to the Civil Action.

     3.  At the Closing, the Settlement Agreement Parties, Pamela D.A. Reeve,
William G. Brown, III, RentGrow, Inc., Trade Credit Corp., Dent-A-Med Northeast,
Inc., GWA Information Systems, Inc. and Entrepreneurial Limited Partnership VII
shall execute and deliver a Mutual General Release in the form attached hereto
as Exhibit G (the "Mutual General Release").

     4.  At the Closing, BEB, Inc. shall issue and deliver to Boyle a promissory
note in the principal amount of $169,050 in the form attached hereto as Exhibit
H (the "Note").

     5.  At the Closing, Boyle shall execute a stock power in blank sufficient
to permit transfer of all of the common stock, par value $.01 per share, of BEB,
Inc. held by Boyle, and shall deliver such stock power to BEB, Inc. together
with the stock certificate(s) to which such stock power relates.



                                      -4-
<PAGE>
 
     6.  At the Closing, Boyle shall execute an Assignment of Note in the form
attached hereto as Exhibit I and deliver such Assignment of Note along with the
Note to BEB Limited Partnership I.

     7.  At the Closing, BEB Limited Partnership I shall deliver to Boyle the
securities listed in Exhibit J hereto under the name of BEB Limited Partnership
I, together with stock powers sufficient to permit transfer attached thereto.

     8.  At the Closing, BEB Limited Partnership II shall deliver to Boyle the
securities listed in Exhibit J hereto under the name of BEB Limited Partnership
II, together with stock powers sufficient to permit transfer attached thereto.

     9.  At the Closing, Boyle shall execute a stock power in blank sufficient
to permit transfer of all of the common stock, par value $.01 per share, of
Entrepreneurial, Inc. held by Boyle, and shall deliver such stock power to
Entrepreneurial, Inc. together with the stock certificate(s) to which such stock
power relates.

     10.  At the Closing, Boyle shall execute and deliver resignations in the
form attached hereto as Exhibit K, which shall effect the removal of Boyle from
the boards of directors and all positions as officer or employee of certain
corporations.  Brian E. Boyle acknowledges that he has already been removed from
the board of directors of Dent-A-Med Northeast, Inc.  Brian E. Boyle will not
seek legal recourse for any actions which were taken to effectuate his removal
from the position of Chairman of Boyle Leasing Technologies, Inc.  The
Plaintiffs and Related Parties



                                      -5-
<PAGE>
 
acknowledge that Boyle is not hereby removed from the Board of Directors of
Boyle Leasing Technologies, Inc., and Boyle acknowledges that he is no longer
Chairman of such corporation.  The Settlement Agreement Parties hereby agree
that Boyle holds no interests, as shareholder, optionholder, or otherwise, in
Trade Credit Corp. and GWA Information Systems, Inc.  The Settlement Agreement
Parties hereby further acknowledge that Boyle holds no position, as director,
officer, employee or other similar position in, Dent-A-Med Northeast, Inc.,
RentGrow, Inc., Trade Credit Corp. or GWA Information Systems, Inc.

     11.  At the Closing, Brian E. Boyle and Boyle Corp. shall execute and
deliver a resignation in the form attached hereto as Exhibit L which shall
effect their withdrawal, as applicable, to the extent they have not already
withdrawn, as a General Partner of BEB Limited Partnership II, BEB Limited
Partnership III, BEB Limited Partnership IV and Entrepreneurial Limited
Partnership VI.

     12.  At the Closing, Boyle shall execute and deliver the Agreements of
Assignment and Assumption relating to his interest in Entrepreneurial Limited
Partnership VI in the form attached hereto as Exhibits M-1 and M-2 and such
Agreements of Assignment and Assumption shall be submitted within twenty days
after the Closing to Amherst College and Cornell University, respectively, for
acceptance on or before December 31, 1996; provided, however, that nothing in
this paragraph shall be construed to prevent Torrence C. Harder from recovering
from Entrepreneurial Limited Partnership VI amounts previously contributed to
the capital


                                      -6-
<PAGE>
 
of Entrepreneurial Limited Partnership VI on behalf of Boyle; and provided,
further, that failure by Amherst College or Cornell University to accepts its
assignment shall result in such interest reverting back to the benefit of
Entrepreneurial Limited Partnership VI and its partners at that time.

     13.  Each Settlement Agreement Party warrants and represents to the other
Settlement Agreement Parties that his or its execution, delivery and performance
of this Settlement Agreement have been duly authorized and that the individual
executing this Settlement Agreement on behalf of such Settlement Agreement Party
is fully authorized to do so.  BEB, Inc., Entrepreneurial, Inc. and Boyle Corp.
shall each deliver at the Closing an officer's certificate certifying such due
authorization and including (i) votes approving the Settlement Agreement and the
transactions contemplated thereby, and (ii) in the case of BEB, Inc., and
Entrepreneurial, Inc., copies of the agreements of limited partnership of BEB
Limited Partnership I, BEB Limited Partnership II, BEB Limited Partnership III,
BEB Limited Partnership IV and Entrepreneurial Limited Partnership VI and all
amendments thereto.

     14.  This Settlement Agreement and all the terms thereof are, and shall be
treated as, confidential and shall not be disclosed or revealed at any time in
whole or in part to any person or entity except that (i) any Settlement
Agreement Party may disclose this Settlement Agreement or the terms thereof to
any shareholder, officer, director or partner of any entity that signs this
Settlement Agreement or the Mutual General Release, or to any individual who was
deposed in any capacity in the Civil



                                      -7-
<PAGE>
 
Action; (ii) any Settlement Agreement Party may disclose this Settlement
Agreement or the terms thereof under a lawful order of any court or governmental
agency, or as otherwise specifically required by law, regulation or other
controlling legal requirement; (iii) any Settlement Agreement Party may disclose
this Settlement Agreement or the terms thereof to the extent necessary to
enforce such terms; (iv) any Settlement Agreement Party may disclose this
Settlement Agreement or the terms thereof to specific persons or entities with
the prior written consent of the other Settlement Agreement Parties; (v) any
Settlement Agreement Party may disclose this Settlement Agreement or the terms
thereof in connection with and to the extent ordinarily called for in the
preparation of financial statements (and may deliver such financial statements
to any party to which it is legally or contractually bound to do so); and (vi)
any Settlement Agreement Party may disclose this Settlement Agreement or the
terms thereof as may be reasonably required in connection with a due diligence
request relating to an initial public offering or financing.  In any instance in
which disclosure of this Settlement Agreement or any terms thereof is believed
to be necessary in order to effect any of clauses (i) through (vi) above, or to
be required under a lawful order of any court or governmental agency, or
otherwise specifically required by law, regulation or other controlling legal
requirement, the Settlement Agreement Party wishing to make such disclosure
shall provide reasonable advance notice to each other Settlement Agreement Party
of its intention to disclose in order to enable the other Settlement Agreement
Parties, if they so desire, to seek to prevent



                                      -8-
<PAGE>
 
such disclosure by appropriate legal means.  Such notice need not be given to
each individual entity or individual that is a member of any of the Settlement
Agreement Parties, but will be sufficient if given by first class mail or
overnight delivery service, postage or cost prepaid (as follows):

If to the Plaintiffs or Related Parties:
- --------------------------------------- 

     Lightbridge, Inc.
     281 Winter Street
     Waltham, MA 02154
     Attention:  Chief Executive Officer

     BEB, Inc.
     281 Winter Street
     Waltham, MA 02154
     Attention:  Chief Executive Officer

     Entrepreneurial, Inc.
     281 Winter Street
     Waltham, MA 02154
     Attention:  Chief Executive Officer

     BEB Limited Partnership I
     281 Winter Street
     Waltham, MA 02154
     Attention:  General Partner

     BEB Limited Partnership II
     281 Winter Street
     Waltham, MA 02154
     Attention:  General Partner

     BEB Limited Partnership III
     281 Winter Street
     Waltham, MA 02154
     Attention:  General Partner

     BEB Limited Partnership IV



                                      -9-
<PAGE>
 
     281 Winter Street
     Waltham, MA 02154
     Attention:  General Partner

     Entrepreneurial Limited Partnership VI
     281 Winter Street
     Waltham, MA 02154
     Attention:  General Partner

With a copy to:     Foley, Hoag & Eliot
                    One Post Office Square
                    Boston, MA 02109
                    Attention:  John D. Patterson, Jr., Esq.

If to Boyle or Boyle Corp.:
- -------------------------- 

     Brian E. Boyle
     31 Hallett Hill Road
     Weston, MA 02193

With a copy to:     Hale and Dorr
                    60 State Street
                    Boston, MA 02109
                    Attention:  Thomas L. Barrette, Jr., Esq.

No Settlement Agreement Party shall be deemed to be in violation of this
paragraph to the extent that he or it re-discloses information previously
disclosed by any other Settlement Agreement Party pursuant to said paragraph.

          15.  In connection with the execution of this Settlement Agreement and
any attachments hereto, including without limitation the Mutual General Release,
and in connection with the options sold by Boyle to the Plaintiffs as set forth
in Section 18 hereof, Boyle specifically acknowledges that Lightbridge, Inc. is
continuing to communicate with investment banks, investors, underwriters and
advisors the result of



                                     -10-
<PAGE>
 
which may be a private placement, or initial public offering, of equity
securities of Lightbridge, Inc. at a price per share that may or may not exceed
the exercise price of the options sold pursuant to the said letter agreement.
Prior to December 28, 1995,  Lightbridge, Inc. received and provided to Boyle a
term sheet from Trident Capital, L.L.C. with respect to a private placement of
equity securities and anticipates receiving other such term sheets from venture
capital, corporate or individual investors or other sources of equity financing.

          16.  From and after the Closing, Boyle on the one hand and the
Plaintiffs, Entrepreneurial, Inc., Entrepreneurial Limited Partnership VI,
Torrence C. Harder, Pamela D.A. Reeve, William G. Brown, III, RentGrow, Inc.,
Trade Credit Corp., Dent-A-Med Northeast, Inc. and GWA Information Systems, Inc.
on the other hand hereby agree to indemnify each other and to hold each other
harmless of and from any cost or liability because of any suit, proceeding, or
litigation brought by Boyle or by the Plaintiffs, Entrepreneurial, Inc.,
Entrepreneurial Limited Partnership VI, Torrence C. Harder, RentGrow, Inc.,
Trade Credit Corp., Dent-A-Med Northeast, Inc. and GWA Information Systems, Inc.
for, or based on, any claim released by the Mutual General Release.  In the
event of such suit, proceeding or litigation for, or based on, any claim
released by the Mutual General Release, the prevailing party shall be entitled
to recover from the other Settlement Agreement Party its reasonable attorney's
fees and costs incurred in defending such suit, proceeding or litigation.




                                     -11-
<PAGE>
 
          17.  The letter agreement of December 28, 1995 is merged into this
Settlement Agreement, which, together with all transactions contemplated hereby
and all agreements, instruments and other documents delivered herewith or at the
Closing (collectively, the "Settlement Documents") constitute the complete and
exclusive agreement among the Settlement Agreement Parties with respect to the
subject matter thereof, and supersede all prior and contemporaneous agreements
and understandings, oral or written, between the Settlement Agreement Parties,
with respect to such subject matter.  No representation, promise, proposal,
warranty, covenant, condition, inducement, statement of intention, or other
statement or communication, express or implied, has been made by any Settlement
Agreement Party with respect to such subject matter that has not been set forth
in the Settlement Documents, and no Settlement Agreement Party shall be bound by
any purported representation, promise, proposal, warranty, covenant, condition,
inducement, statement of intention, or other statement or communication, express
or implied, with respect to such subject matter that is not set forth in the
Settlement Documents, and in entering into the Settlement Documents no
Settlement Agreement Party is relying on any representation, promise, proposal,
warranty, covenant, condition, inducement, statement of intention, or other
statement or communication, express or implied, made by any other Settlement
Agreement Party except as expressly set forth in the Settlement Documents.

          18.  At the Closing, Brian E. Boyle shall sell the Options to the
Plaintiffs other than BEB, Inc. in the denominations and otherwise as set forth
in



                                     -12-
<PAGE>
 
Exhibits N-1 through N-15 hereto upon tender of payment by check in the amount
of $51,000 in the aggregate, plus interest from January 19, 1996 through the
Closing at 8% per annum.

          19.  Lightbridge, Inc. hereby agrees that after the Closing and in the
event that Brian E. Boyle first delivers to Lightbridge, Inc. an Affidavit of
Lost, Stolen, Mutilated or Destroyed Certificate in form and substance
reasonably satisfactory to Lightbridge, Inc., it shall, consistent with its by-
laws, use its best efforts to issue a new stock certificate to Brian E. Boyle of
like tenor and denomination.

          20.  Except for those agreements entered into in connection with this
Settlement Agreement, and except for the indemnification provisions set forth in
the partnership agreements of the partnerships that are Settlement Agreement
Parties and in the by-laws of Lightbridge, Inc. with respect to claims arising
before the Closing, from and after the Closing all prior contracts, agreements,
covenants, undertakings, promises, plans and understandings, whether oral or in
writing, between Boyle and any other party to the Mutual General Release are
hereby terminated with no further rights, duties, obligations or liabilities
thereunder, including without limitation (i) the letter from Boyle to Pamela
D.A. Reeve, dated December 16, 1993 and signed by Reeve as President and Chief
Executive Officer of Credit Technologies, Inc. on December 12, 1993; (ii) the
so-called "Amended and Restated Employment and Compensation Agreement" between
Credit Technologies, Inc. ("CTI") and Brian E.



                                     -13-
<PAGE>
 
Boyle dated February 8, 1991; (iii) the Voting Agreement among Brian E. Boyle,
Torrence C. Harder and CTI dated December 31, 1990 (the "Voting Agreement");
(iv) the Incentive and Nonqualified Stock Option and Confidentiality Agreement
dated November 27, 1990 between CTI and Brian E. Boyle; and (v) any agreement
with respect to BEB, Inc.; provided, that Boyle shall promptly return
securities, if any, held pursuant to the Voting Agreement, which agreement shall
be terminated with no further rights, duties, obligations or liabilities
thereunder upon such return.  All such contracts, agreements, covenants,
undertakings, promises, plans and understandings that include parties other than
the Settlement Agreement Parties, including without limitation x) the Stock
Restriction Agreement as it pertains to Brian E. Boyle, his successors and
assigns, shall be terminated (or amended so as to have the effect of termination
as to Boyle) from and after the Closing and after agreement to so terminate
among all such other parties that are required to so agree in order to
effectuate such termination.  The Settlement Agreement Parties covenant to
execute at the Closing such agreements to terminate and further covenant to use
their best efforts to obtain such agreements to terminate from other relevant
parties, which further covenant shall continue after the Closing if such
agreements are not obtained before the Closing.  Upon termination of any such
agreements, Lightbridge, Inc. shall deliver stock certificates without legends
relating to agreements terminated as set forth above in substitution for
certificates having such legends, which certificates shall be delivered by Brian
E. Boyle.  The Plaintiffs and Related Parties hereby agree that a)



                                     -14-
<PAGE>
 
BEB Limited Partnership I, BEB Limited Partnership II, BEB Limited Partnership
III, BEB Limited Partnership IV and Entrepreneurial Limited Partnership VII
shall provide annual audited financial statements relating to such entity to
Brian E. Boyle so long as he is a partner in, or creditor of, such partnership
and with respect to any year for which he was a partner or creditor for any part
of the year, b) Lightbridge, Inc., Dent-A-Med, Inc., Dent-A-Med Northeast, Inc.,
GWA Information Systems, Inc., RentGrow, Inc. and Trade Credit Corp. shall
provide annual audited financial statements and quarterly reports relating to
such entities to Brian E. Boyle to the extent that such statements and reports
are distributed to other stockholders or creditors generally and with respect to
any particular corporation if he is and for so long as he shall remain a
stockholder or ceditor of such corporation, and c) BEB, Inc. and
Entrepreneurial, Inc. shall provide Brian E. Boyle with Forms K-1 and all other
information relating to such entities necessary for him to prepare his federal
and state income tax returns.

          21.  Notwithstanding the generality of the foregoing, nothing herein
shall be construed to have any effect on (i) Boyle's rights, if any, to
indemnification from the Plaintiffs for any claims made against Boyle arising
out of conduct prior to the execution of this Settlement Agreement; or (ii) any
invoices from D. Quinn Mills to Boyle for services rendered as a mediator in the
Civil Action, or on the obligations, if any, of Boyle to make any payment with
respect to the same, or on Boyle's rights,



                                     -15-
<PAGE>
 
if any, to object to or challenge any such invoices or any amounts claimed for
such services.

          22.  The business, professional, employment and investment activities
of the Settlement Agreement Parties will be unrestricted by this Settlement
Agreement, the Options, or any other agreement, understanding, expectation or
commitment between the Settlement Agreement Parties, except for the limitations
imposed by Paragraph 23 below.  The conduct of the Settlement Agreement Parties
hereto will continue to be subject to the laws of this Commonwealth.

          23.  After the Closing, the Settlement Agreement Parties will return
to each other all materials acquired from each other in the discovery process in
the Civil Action, and will not at any time use, or cause or permit any other
person to use, such materials or any of the information contained therein for
any purpose.  Counsel for the respective Settlement Agreement Parties will cause
such materials to be delivered to opposing counsel (identified in paragraph 14
above) within ten (10) days of the Closing.

          24.  The Settlement Agreement Parties state that they have been
represented by counsel of their choice throughout the negotiation of this
Settlement Agreement, that they fully discussed its terms and conditions with
counsel, and that they fully understood its terms and conditions.




                                      -16
<PAGE>
 
          25.  This Settlement Agreement shall be binding upon and inure to the
benefit of the Settlement Agreement Parties and their respective successors in
interest, transferees, heirs and assigns.

          26.  The Settlement Agreement Parties agree that the terms and
conditions of this Settlement Agreement are valid and enforceable under the laws
of the Commonwealth of Massachusetts and that the Settlement Agreement shall be
governed by and construed in accordance with the substantive law of The
Commonwealth of Massachusetts.

          27.  This Settlement Agreement may be executed in one or more
counterparts, each of which, when so executed, shall be deemed to be an
original, but all of which together shall constitute one and the same
instrument.

     IN WITNESS WHEREOF, the Settlement Agreement Parties have caused this
Settlement Agreement to be executed by their duly authorized officers or agents
as of the date set forth immediately below their respective signatures.

LIGHTBRIDGE, INC.                      BEB, INC.


By:  /s/ William G. Brown              By:  /s/ Torrence C. Harder
     --------------------------             --------------------------
 
Title: Chief Financial Officer         Title: President
       ------------------------               ------------------------
 
Date: February 1, 1996                 Date: 1 February 1996
      -------------------------              -------------------------
 
Witness: /s/ Georgia Diamond           Witness: /s/ Georgia E. Diamond
         ----------------------                 ---------------------- 


                                     -17-
<PAGE>
 
BEB LIMITED PARTNERSHIP I              BEB LIMITED PARTNERSHIP II
                              
By:  BEB, Inc.                         By:  BEB, Inc.
Its:  General Partner                  Its:  General Partner
 

By:  /s/ Torrence C. Harder            By:  /s/ Torrence C. Harder
     --------------------------             --------------------------
 
Title: President                       Title: President
       ------------------------               ------------------------
 
Date: 1 February 96                    Date: 1 February 96
      -------------------------              -------------------------
 
Witness: /s/ Georgia E. Diamond        Witness: /s/ Georgia Diamond
         ----------------------                 ----------------------  

BEB LIMITED PARTNERSHIP III            BEB LIMITED PARTNERSHIP IV
                              
By:  BEB, Inc.                         By:  Entrepreneurial, Inc.      
Its:  General Partner                  Its:  General Partner           
                                                                       
                                                                       
By:  /s/ Torrence C. Harder            By:  /s/ Torrence C. Harder
     --------------------------             --------------------------
 
Title: President                       Title: President
       ------------------------               ------------------------
 
Date: 1 February 96                    Date: 1 February 96  
      -------------------------              -------------------------
 
Witness: /s/ Georgia Diamond           Witness: /s/ Georgia Diamond
         ----------------------                 ----------------------  

BRIAN E. BOYLE                         ENTREPRENEURIAL, INC.


By:  /s/ Brian Boyle                   By:  /s/ Torrence C. Harder     
     --------------------------             -------------------------- 
                                                                       
Date: 2/3/96                           Title: President                
      -------------------------               ------------------------ 
                                                                       
Witness: /s/ Polly Marmaduke           Date: 1 February 96
         ----------------------              ------------------------- 
                                                                       
                                       Witness: /s/ Georgia E. Diamond 
                                                ----------------------   


                                      -18-
<PAGE>
 
ENTREPRENEURIAL LIMITED         TORRENCE C. HARDER
PARTNERSHIP, VI

By:  Entrepreneurial, Inc.      /s/ Torrence C. Harder
                                ----------------------------------------
Its:  General Partner
                                Date: 1 February 96
                                      ----------------------------------

By:  /s/ Torrence C. Harder     Witness: /s/ Georgia Diamond
     --------------------------          -------------------------------

Title: President
       ------------------------

Date: 1 February 96
      -------------------------

Witness: /s/ Georgia Diamond
         ----------------------

BOYLE CORP.

By:  /s/ Brian Boyle
     --------------------------

Title: President
       ------------------------

Date: 2/3/96
      -------------------------

Witness: /s/ Polly Marmaduke
         ----------------------


                                     -19-

<PAGE>
 
                                                                    EXHIBIT 10.9

 
                 DATE OF LEASE EXECUTION:  September 21, 1993

                         (To be completed by Landlord)


                                   ARTICLE I

                                REFERENCE DATA


1.1  SUBJECTS REFERRED TO:

     Each reference in this lease to any of the following subjects shall be
construed to incorporate the date stated for that subject in this Section 1.1:

LANDLORD:                               L&E Investment of Massachusetts One,
                                        Inc., a Delaware corporation
 
MANAGING AGENT:                         R.M. Bradley & Co., Inc.
 
LANDLORD'S & MANAGING AGENT'S ADDRESS:  Somerset Court
                                        281 Winter Street
                                        Waltham, Massachusetts  02154
                                        Attention:  Carol MacLeod
 
TENANT:                                 Credit Technologies Inc., a Delaware
                                        corporation
 
TENANT'S ADDRESS (FOR NOTICE AND        281 Winter Street
BILLING):                               Waltham, Massachusetts  02154
                                        Attention:  Accounts Payable
 
 
BUILDING ADDRESS:                       281 Winter Street
                                        Waltham, Massachusetts  02154
 
TENANT'S SPACE:                         Portion of the first floor and second
                                        floor as shown on Exhibit A-1 and
                                        Exhibit A-2 attached hereto, as the
                                        same may be increased from time to
                                        time pursuant to the terms hereof.

                                      -1-
<PAGE>
 
RENTABLE FLOOR AREA OF TENANT'S SPACE:  17,580 square feet (12,882 of which
                                        are on the first floor and 4,698 of
                                        which are on the second floor), as
                                        the same may be increased pursuant to
                                        the terms hereof.
 
TENANT'S PROPORTIONATE SHARE:           25.93% (17,580) square feet divided
                                        by 67,800 square feet), as the same
                                        may be increased upon addition to
                                        Tenant's Space.
 
TOTAL RENTABLE FLOOR AREA OF THE
BUILDING:                               67,800 square feet.
 
PARKING SPACES ALLOCATED TO TENANT:     Approximately 70 parking spaces
                                        (calculated at 4.0 unassigned parking
                                        spaces per 1,000 square feet).
 
COMMENCEMENT DATE:                      The earlier to occur of (i) November
                                        1, 1993 or (ii) the substantial
                                        completion of Leasehold Improvements
                                        to be undertaken by Landlord on the
                                        portion of Tenant's Space located on
                                        the second floor of the Building.
 
TERM EXPIRATION DATE:                   The last day of the month in which
                                        the seventh anniversary of the
                                        Commencement Date occurs.
 
APPROXIMATE TERM:                       Seven (7) years.
 
BASE OPERATING COSTS:                   Landlord's Operating Costs for the
                                        year ending December 31, 1994.
 
BASE TAX COSTS:                         Real estate taxes for the Tax Year
                                        1994.
 
ANNUAL RENT:                            $21.50 per rentable square foot/year,
                                        plus $0.75 per rentable square foot
                                        for electricity charges for all of
                                        Tenant's Space except for 2,337
                                        rentable square feet separately
                                        metered and paid for by Tenant.

                                      -2-
<PAGE>
 
FIRST FISCAL YEAR FOR TENANT'S PAYING
OPERATING COST ESCALATION:              Year ending December 31, 1995.
 
 
FIRST YEAR FOR TENANT'S PAYING TAX      Tax Year 1995.
ESCALATION:
 
PERMITTED USES:                         General office use.
 
PUBLIC LIABILITY INSURANCE:
 
  BODILY INJURY:
                                        $2,000,000.00 per
                                        person/$2,000,000.00 per accident.
 
  PROPERTY DAMAGE:                      $1,000,000.00

  SPECIAL PROVISIONS:                   Tenant's option to lease additional
                                        space; Tenant's option to expand;
                                        Mandatory expansion.
 
FISCAL YEAR:                            January 1, through December 31.
 
TAX YEAR:                               July 1 through June 30 (as the same
                                        may be modified from time to time by
                                        the appropriate municipality or
                                        state); Tax Year 1994 is the Tax Year
                                        beginning July 1, 1993 and all other
                                        Tax Years shall be similarly
                                        determined.
 
1.2  EXHIBITS.

     The exhibits listed below in this Section 1.2 are incorporated in this
Lease by reference and are to be construed as part of this Lease:

     EXHIBIT A-1    Plan showing Tenant's Space on first floor.

     EXHIBIT A-2    Plan showing Tenant's Space on second floor.

     EXHIBIT B      Specifications of Leasehold Improvements.

     EXHIBIT C      Building Standards.

                                      -3-
<PAGE>
 
     EXHIBIT D      Landlord's Services.

     EXHIBIT E      Rules and Regulations.

     EXHIBIT F      Mandatory Expansion Space.

 
1.3  TABLE OF CONTENTS.

<TABLE> 
<S>                 <C> 
ARTICLE II - PREMISES AND TERM................................................

     Section  2.1   Premises..................................................
     Section  2.2   Term......................................................
     Section  2.3   Extended Terms............................................
     Section  2.4   Mandatory Expansion.......................................
     Section  2.5   Optional Expansion........................................

ARTICLE III - Construction....................................................

    Section   3.1   Acceptance of the Premises................................
    Section   3.2   General Provisions Applicable to Construction.............

    Section   3.3   Representatives...........................................

ARTICLE IV - Rent.............................................................

    Section   4.1   Rent......................................................
    Section   4.2   Operating Costs; Taxes; Escalation........................
    Section   4.3   Estimated Escalation Payments.............................
    Section   4.4   Change of Fiscal Year.....................................
    Section   4.5   Payments..................................................

ARTICLE V - LANDLORD'S COVENANTS..............................................

    Section   5.1   Landlord's Covenants During the Term......................
                    Section  5.1.1  Building Services.........................
                    Section  5.1.2  Additional Building Services..............
                    Section  5.1.3  Repairs...................................
                    Section  5.1.4  Quiet Enjoyment...........................
    Section   5.2   Interruptions.............................................
</TABLE> 

                                      -4-
<PAGE>
 
<TABLE> 
<S>                 <C> 
ARTICLE VI - TENANT'S COVENANTS...............................................

     Section  6.1   TENANT'S COVENANTS DURING THE TERM........................

                    Section  6.1.1  Tenant's Payments.........................
                    Section  6.1.2  Repairs and Yielding Up...................
                    Section  6.1.3  Occupancy and Use.........................
                    Section  6.1.4  Rules and Regulations.....................
                    Section  6.1.5  Safety Appliances.........................
                    Section  6.1.6  Assignment and Subletting.................
                    Section  6.1.7  Indemnity.................................
                    Section  6.1.8  Tenant's Liability Insurance..............
                    Section  6.1.9  Tenant's Worker's Compensation............
                                    Insurance.................................
                    Section  6.1.10 Landlord's Right of Entry.................
                    Section  6.1.11 Loading...................................
                    Section  6.1.12 Landlord's Costs..........................
                    Section  6.1.13 Tenant's Property.........................
                    Section  6.1.14 Labor or Materialmen's Liens..............
                    Section  6.1.15 Changes or Additions......................
                    Section  6.1.16 Holdover..................................
                    Section  6.1.17 Right of Financial Review.................

ARTICLE VII - CASUALTY AND TAKING.............................................

     Section  7.1   Casualty and Taking.......................................
     Section  7.2   Reservation of Award......................................

ARTICLE VIII - RIGHTS OF MORTGAGEE............................................

     Section  8.1   Priority of Lease.........................................
     Section  8.2   Rights of Mortgage Holders; Limitation of Mortgagee's 
                    Liability.................................................
     Section  8.3   Mortgagee's Election......................................
     Section  8.4   No Prepayment or Modification, Etc........................
     Section  8.5   No Release or Termination.................................
     Section  8.6   Continuing Offer..........................................
     Section  8.7   Mortgagee's Approval......................................

ARTICLE IX - DEFAULT..........................................................

     Section  9.1   Events of Default.........................................
     Section  9.2   Tenant's Obligations After Termination....................
</TABLE> 

                                      -5-
<PAGE>
 
<TABLE> 
<S>                  <C> 
ARTICLE X - MISCELLANEOUS.....................................................

     Section   10.1  Notice of Lease..........................................
     Section   10.2  Intentionally Omitted....................................
     Section   10.3  Notices From One Party to the Other......................
     Section   10.4  Bind and Inure...........................................
     Section   10.5  No Surrender.............................................
     Section   10.6  No Waiver, Etc...........................................
     Section   10.7  No Accord and Satisfaction...............................
     Section   10.8  Cumulative Remedies......................................
     Section   10.9  Landlord's Right to Cure.................................
     Section   10.10 Estoppel Certificate.....................................
     Section   10.11 Waiver of Subrogation....................................
     Section   10.12 Acts of God..............................................
     Section   10.13 Brokerage................................................
     Section   10.14 Submission Not An Offer..................................
     Section   10.15 Applicable Law And Construction..........................
</TABLE>

                                      -6-
<PAGE>
 
                                  ARTICLE II

                               PREMISES AND TERM

2.1  PREMISES.

     Subject to and with the benefit of the provisions of this Lease and any
ground lease or land disposition agreement relating to the parcel on which the
Building is located (the "Lot"), Landlord hereby leases to Tenant, and Tenant
leases from Landlord, Tenant's Space in the Building, excluding exterior faces
of exterior walls, the common facilities area and building service fixtures and
equipment serving exclusively or in common other parts of the Building.
Tenant's Space, with such exclusions, is hereinafter referred to as the
"Premises".

     Tenant shall have, as appurtenant to the Premises, the right to use in
common with others entitled thereto: (a) the common facilities included in the
Building or on the Lot, including the parking facility, if any, to the extent
and in the location from time to time designated by Landlord as set forth in
Section 1.1 and (b) the building service fixtures and equipment serving the
Premises.

     Landlord reserves the right from time to time, without unreasonable
interference with Tenant's use, (a) to install, repair, replace, use, maintain
and relocate for service to the Premises and to other parts of the Building or
either, building service fixtures and equipment wherever located in the Building
and (b) to alter or relocate any other common facilities, it being understood
that if any parking facilities are provided, the same may be relocated on or off
the Lot from time to time by Landlord, provided that in all events substitutions
are substantially equivalent.

2.2  TERM.

     To have and to hold for a period (the "Term") commencing on the
Commencement Date and continuing until the Term Expiration Date, unless sooner
terminated as provided in Section 6.1.6, 7.1, or in ARTICLE IX.  Landlord and
Tenant agree to confirm, in writing, the exact Commencement Date upon request of
either party and agree that "substantial completion of Leasehold Improvements to
be undertaken by Landlord on the portion of Tenant's Space located on the second
floor of the Building" shall mean the first to occur of (i) Tenant's occupancy
of said space or (ii) the substantial completion of the Leasehold Improvements
for said space (which may be conclusively determined by a certificate of
completion by a licensed architect or registered engineer).

                                      -7-
<PAGE>
 
2.3  EXTENDED TERMS.

     Tenant shall have the right and option to extend the Term for up to two (2)
successive periods of three (3) years each, each such option to be exercisable
by notice given to Landlord not less than nine months prior to the expiration of
the then current term.  If any such option is so exercised, all of the terms,
covenants, conditions and provisions of this Lease shall apply during the Term
as extended except that during each additional three year period, the Annual
Rent shall be the higher of (a) $22.50 per rentable square foot per year or (b)
the fair market rental value of the Premises.  In the event that Tenant
exercises its extension options hereunder, Landlord shall, pursuant to written
notice to Tenant within thirty (30) days following receipt of the applicable
Tenant's extension notice, propose the fair market rental value of the Premises
(the "Landlord's Proposed Fair Market Rent").  The Landlord's Proposed Fair
Market Rent shall constitute the fair market rental value of the Premises for
purposes of this Section 2.3 unless Tenant notifies Landlord within twenty (20)
days of Tenant's receipt of Landlord's Proposed Fair Market Rent proposal that
such Landlord's Proposed Fair Market Rent is not satisfactory to Tenant and
specifies in such notice the name and address of an appraiser designated by
Tenant in accordance with sub-paragraph (b) below (the "Tenant's Appraisal
Notice") in which event the fair market rental value of the Premises shall be
determined by the following procedure:

     (a)  Landlord shall, within ten (10) days after receipt of Tenant's
Appraisal Notice, notify Tenant of the name and address of an appraiser
designated by Landlord.  Such two appraisers shall, within thirty (30) days
after the designation of the second appraiser, make their determinations of the
fair market rental value of the Premises in writing and give notice thereof to
each other and to Landlord and Tenant.  Such two (2) appraisers shall have
fifteen (15) days after the receipt of notice of each other's determinations to
confer with each other and to attempt to reach agreement as to the determination
of the fair market rental value of the Premises.  If such appraisers shall
concur in such determination, they shall give notice thereof to Landlord and
Tenant and such concurrence shall be final and binding upon Landlord and Tenant.
If such appraisers shall fail to concur as to such determination within said
fifteen (15) day period, they shall immediately designate a third appraiser and
shall submit in writing to such third appraiser their respective determinations
of the fair market rental value of the Premises.  If the two appraisers shall
fail to agree upon the designation of such third appraiser within ten (10) days
after said fifteen (15) day period, then they or either of them shall give
notice of such failure to 

                                      -8-
<PAGE>
 
agree to Landlord and Tenant and, if Landlord and Tenant fail to agree upon the
selection of such third appraiser within ten (10) days after the appraiser(s)
appointed by the parties give notice as aforesaid, then either party on behalf
of both may apply to the president of the local chapter of the American
Institute of Real Estate Appraisers (provided he or she is not an officer or
employee of an entity actively engaged as an agent working on behalf of Landlord
or Tenant) or on its failure, refusal or inability to act within 10 days of the
application to that person to act, to a court of competent jurisdiction, for the
designation of such third appraiser.

     (b)  All individuals who shall be designated or selected as appraisers
hereunder shall be real estate professionals who shall have had at least ten
(10) years continuous experience in the business of leasing similar space in the
greater Boston area.

     (c)  The third appraiser shall conduct such hearings and investigations as
he or she may deem appropriate and shall, within thirty (30) days after the date
of his or her designation, select either the determination of Landlord's
appraiser or that of Tenant's appraiser, whichever he or she deems more
reasonable given his or her independent determination of the fair market rental
value of the Premises.

     (d)  The determination of the appraisers, as provided above, shall be
conclusive upon the parties and shall have the same force and effect as a
judgment made in a court of competent jurisdiction and either party shall be
entitled to have a judgment entered thereon in any court of competent
jurisdiction.  Landlord shall pay the fees and expenses of the appraiser chosen
by Landlord, Tenant shall pay the fees and expenses of the appraiser chosen by
Tenant, and the fees and expenses of the third appraiser shall be paid in equal
proportions by Landlord and Tenant.

     (e)  If for any reason the fair market rental value shall not have been
determined prior to the commencement of any additional three year period, Tenant
shall pay Annual Rent hereunder at the Annual Rent proposed by Landlord's
appraiser, or the Annual Rent during the next preceding period, whichever is
greater, until the fair market rental value has been determined.  The parties
shall thereafter retroactively adjust such Annual Rent within ten (10) days from
the determination of the fair market rental value of the Premises.

     Unless the context clearly requires otherwise, the word "Term" as used in
this Lease shall mean and include the period set forth in Section 2.2 above and
any period as to which the aforesaid option shall have been exercised.

                                      -9-
<PAGE>
 
2.4  MANDATORY EXPANSION.

     On December 1, 1994 (or if not available on such date the date on which
Landlord is able to provide the Mandatory Expansion Space (as hereinafter
defined)) approximately 6,400 square feet of rentable floor area on the second
floor of the Building as shown on Exhibit F attached hereto and incorporated
herein (the "Mandatory Expansion Space") shall be added to the Tenant's Space.
Landlord shall provide a Tenant Allowance of up to $18.00 per rentable square
foot of such space for Leasehold Improvements of the Mandatory Expansion Space
on the terms and conditions of the First Floor Tenant Allowance. In all other
respects, the Mandatory Expansion Space shall be subject to the same terms and
conditions as this lease (including, without limitation, obligations for Annual
Rent and additional rent), provided that the Term for such space shall be
coterminous with this lease.

2.5  OPTIONAL EXPANSION.

     Prior to leasing any space on the first floor of the building not occupied
by Tenant, and not subject to a previous right of first offer, refusal or
expansion, Landlord shall offer such space to Tenant at the same Annual Rent,
additional rent, electrical charges and subject to the same covenants and
obligations of Tenant, provided that the Term thereof shall be coterminous with
this lease.  Tenant shall have the right to accept such offer within five (5)
days after the Landlord's written notice of availability of such space.  If
Tenant does not accept such space prior to the expiration of such five (5) day
period, Landlord shall be free to lease the same to a third party on such terms
and conditions as Landlord shall determine in its sole discretion.

                                  ARTICLE III

                                 CONSTRUCTION

3.1  ACCEPTANCE OF THE PREMISES.

     Tenant hereby agrees to accept the Premises "AS IS" and "AS SHOWN" as of
the Commencement Date, subject only to the provisions of this Lease.  Tenant
further acknowledges that neither Landlord nor any agent of Landlord has made
any representation, express or implied, written, verbal or otherwise as to the
condition of the Premises or the suitability of the Premises for Tenant's
intended use.

                                      -10-
<PAGE>
 
     All of Tenant's construction, installation of furnishings and later changes
or additions shall be coordinated with any work being performed by Landlord in
such manner as to maintain harmonious labor relations and not to damage the
Building or Lot or to interfere with Building operations.  Except for
installation of furnishings and the installation of telephone outlets which must
be performed by the local telephone company at Tenant's direction and expense,
the Leasehold Improvements shall be performed by Managing Agent.

     Landlord agrees to use reasonable efforts to complete the work described in
Exhibit B (the "Leasehold Improvements") on or before November 1, 1993.

     Costs incurred by Tenant in connection with the space planning,
architectural design and engineering of the Leasehold Improvements shall be paid
by Landlord.  Landlord shall pay for the Leasehold Improvements; provided,
however, that to the extent that the cost of the Leasehold Improvements
(including without limitation the cost of the data center referenced below)
exceeds the sum of (i) the First Floor Tenant Allowance and (ii) the Second
Floor Tenant Allowance, Tenant shall promptly reimburse Landlord for one hundred
percent (100%) of such excess.  The First Floor Tenant Allowance shall be $15.00
per rentable square foot of Tenant's Space on the first floor of the Building.
The Second Floor Tenant Allowance shall be $18.00 per rentable square foot of
Tenant's Space on the second floor of the Building.  The parties hereby agree
that a reasonable portion of the First Floor Tenant Allowance and/or the Second
Floor Tenant Allowance may be used by Tenant to purchase the data center
currently located within the Premises, subject to the receipt and reasonable
approval by Landlord of satisfactory evidence detailing such purchase.

     Landlord will not approve any construction, alterations, or additions
requiring unusual expense to readapt the Premises to normal office use on lease
termination (including, without limitation, construction of an internal stairway
between the first and second floor of the Premises) or increasing the cost of
construction, insurance or taxes on the Building or of Landlord's Services
called for by Section 5.1 unless Tenant first gives assurances acceptable to
Landlord that such readaptation will be made prior to such termination without
expense to Landlord and makes provisions acceptable to Landlord for payment of
such increased cost.  Landlord will also disapprove any alterations or additions
requested by Tenant which will delay completion of the Premises or the Building.
All changes and additions shall be part of the Building except such items as by
writing at the time of approval the parties agree either shall be removed by
Tenant on 

                                      -11-
<PAGE>
 
termination of this Lease, or shall be removed or left at Tenant's election.

3.2  GENERAL PROVISIONS APPLICABLE TO CONSTRUCTION.

     All construction work required or permitted by this Lease, whether by
Landlord or by Tenant, shall be done in a good and workmanlike manner and in
compliance with all applicable laws and all lawful ordinances, regulations and
orders of governmental authority and insurers of the Building. Either party may
inspect the work of the other at reasonable times and promptly shall give notice
of observed defects.

3.3  REPRESENTATIVES.

     Each party authorizes the other to rely in connection with their respective
rights and obligations under this Article III upon approval and other actions on
the party's behalf by a representative to be named by each party upon execution
hereof or by any person designated in substitution or addition by notice to the
party relying.


                                  ARTICLE IV

                                     RENT

4.1  RENT.

     Tenant agrees to pay rent to Landlord, without any offset or reduction
whatever (except as made in accordance with the express provisions of this
Lease), equal to 1/12th of the Annual Rent in equal installments in advance on
the first day of each calendar month included in the Term together with any
additional rent or other charges payable pursuant to this Lease (the sum of
Annual Rent plus any additional rent or other charges is hereinafter referred to
as the "Rent").

          (a)  If the Commencement Date occurs on a day other than the first day
     of a calendar month, Tenant shall pay to Landlord on the first day of the
     succeeding calendar month a pro rata payment of Rent for the partial month
     from the Rent Commencement Date to the first day of the succeeding calendar
     month. Such payment shall constitute payment for the partial month, if any,
     immediately following the Rent Commencement Date.

          (b)  Rent for any partial month shall be paid by Tenant to Landlord at
     such rate on a pro rata basis. Other charges 

                                      -12-
<PAGE>
 
     payable by Tenant on a monthly basis, as hereinafter provided, shall
     likewise be prorated.

          (c)  Rent and any other sums due hereunder not paid within five (5)
     days of the date due shall bear interest at the rate of one and one-half
     percent (1 1/2%) per month or fraction thereof (or at any lesser maximum
     legally permissible rate) from the due date until paid.

     Other charges payable by Tenant on a monthly basis, as hereinafter
provided, shall likewise be prorated, and the first payment on account thereof
shall be determined in similar fashion.

4.2  OPERATING COSTS; TAXES; ESCALATION.

     (a)  Commencing with the First Fiscal Year for Tenant's Paying Operating
Costs Escalation, the Annual Rent payable by Tenant shall be adjusted for
increases in operating costs, adjusted to reflect full occupancy for twelve
months ("LandLord's Operating Costs").  The amounts of such adjustments shall be
determined by:

          (i)  Comparing the Base Operating Costs with Landlord's Operating
               Costs for the Fiscal Year; and

         (ii)  Computing Tenant's share on the basis of Tenant's Proportionate
               Share of the difference between Base Operating Costs and
               Landlord's Operating Costs, such proportionate share being equal
               to a fraction, the numerator of which is the Rentable Floor Area
               of Tenant's Space, and the denominator of which is the Total
               Floor Area of the Building ("Tenant's Proportionate Share").

     (b)  If Landlord's Operating Costs for any Fiscal Year exceed the Base
Operating Costs or if Landlord's Operating Costs for any partial Fiscal Year
exceed the corresponding fraction of Base Operating Costs, Tenant shall pay, as
additional rent, Tenant's Proportionate Share of such excess (such excess being
referred to hereinafter as "Operating Cost Excess").  Such amount shall be due
and payable after the close of the first Fiscal Year in which an Operating Cost
Excess occurs, on or before the thirtieth (30th) day following receipt by Tenant
of Landlord's Statement (as defined below).  As soon as practicable after the
end of each Fiscal Year ending during the Term and after Lease termination,
Landlord shall render a statement ("Landlord's Statement") in reasonable detail
and according to usual accounting practices certified by Landlord and showing
for the preceding Fiscal Year or fraction thereof, as the case may be,
Landlord's Operating Costs.

                                      -13-
<PAGE>
 
     (c)  For purposes of this Article "Landlord's Operating
Costs" shall include:

          (i)  premiums for insurance except premiums for loss of rent if such
               premiums are calculated independently of and not included as part
               of the provisions for other insurance carried by Landlord;

         (ii)  compensation and all fringe benefits, worker's compensation
               insurance premiums and payroll taxes paid by Landlord to, for or
               with respect to all persons engaged in operating, maintaining, or
               cleaning the Building and Lot (or if any of said persons are
               engaged in operating, maintaining or cleaning other buildings or
               lots, a pro rata share thereof as reasonably determined by
               Landlord based upon the percentage of time said persons spend at
               the Building or Lot);

        (iii)  all utility charges not billed directly to tenants by Landlord or
               the utility company, but not including the cost to Landlord of
               electricity furnished for lighting, electrical facilities,
               equipment, machinery, fixtures and appliances used by tenants in
               their respective space (other than Building heating, ventilating,
               and air conditioning equipment) as set forth in Paragraph VII of
               Exhibit D;

         (iv)  payments to independent contractors under service contracts for
               cleaning, operating, managing, maintaining and repairing the
               Building and Lot (which payments may be to affiliates of Landlord
               provided the same are at reasonable and competitive rates
               consistent with the type of occupancy and the services rendered);

          (v)  rent paid by the managing agent or imputed costs equal to the
               loss of rent by Landlord for making available to the managing
               agent space for a Building office on the ground floor or above
               (which space shall not exceed 100 square feet of rentable floor
               area); and

         (vi)  all other reasonable and necessary expenses paid in connection
               with cleaning, operating, managing, maintaining and repairing the
               Building and Lot, or either, and properly chargeable against
               income, it

                                      -14-
<PAGE>
 
               being agreed that the cost of all repairs and replacements shall
               be limited to such repair and replacement that is properly
               expensed under the Internal Revenue Code, and it being further
               agreed that if Landlord installs a new or replacement capital
               item for the purpose of reducing Landlord's Operating Costs, the
               cost thereof as reasonably amortized by Landlord, with interest
               at the average prime commercial rate in effect from time to time
               at the then three largest national banks in Boston, Massachusetts
               or the amortized amount, shall be included in Landlord's
               Operating Costs.

     Landlord's Operating Costs shall be computed on an accrual basis and shall
be determined in accordance with generally accepted accounting principles
consistently applied.  Such costs may be incurred directly or by way of
reimbursement, and shall include taxes applicable thereto.  The following shall
be excluded from Landlord's Operating Costs:

          (i)  depreciation;

         (ii)  expenses relating to tenants' alterations;

        (iii)  expenses for which Landlord, by the terms of this Lease or any
               other lease, makes a separate charge;

         (iv)  the cost of any services or systems for that portion of the
               Building occupied by the Landlord or affiliates of Landlord
               (exclusive of space occupied by Landlord or affiliates of
               Landlord in connection with the operation of the Building) and
               which are not provided generally to other tenants in the
               Building;

          (v)  the cost of constructing additional parking spaces, which costs
               shall be treated as a capital cost by Landlord; and

         (vi)  leasing fees or commissions.

     In case of special services which are not rendered to all areas on a
comparable basis, the proportion allocable to the Premises shall be the same
proportion which the Rentable Floor Area of Tenant's Space bears to the total
rentable floor area to which such service is so rendered (such latter area to be
determined in the same manner as the Total Rentable Floor Area of the Building).

                                      -15-
<PAGE>
 
     (d)  Commencing with the First Year for Tenant's Paying Tax Escalation, the
Annual Rent payable by Tenant shall be adjusted for increases in real estate
taxes, adjusted to reflect full occupancy for twelve months ("Landlord's Tax
Costs").  The amounts of such adjustments shall be determined by:

          (i)  Comparing the Base Tax Costs with Landlord's Tax Costs for the
               Tax Year; and

         (ii)  Computing Tenant's share on the basis of Tenant's Proportionate
               Share of the difference between Base Tax Costs and Landlord's Tax
               Costs.

     (e)  If Landlord's Tax Costs for any Tax Year exceed the Base Tax Costs or
if Landlord's Tax Costs for any partial Tax Year exceed the corresponding
fraction of Base Tax Costs, Tenant shall pay, as additional rent, Tenant's
Proportionate Share of such excess (such excess being referred to hereinafter as
"Tax Excess").  Such amount shall be due and payable after the close of the
first Tax Year in which a Tax Excess occurs, on or before the thirtieth (30th)
day following receipt by Tenant of Landlord's Tax Statement (as defined below).
As soon as practicable after the end of each Tax Year ending during the Term and
after Lease termination, Landlord shall render a statement ("Landlord's Tax
Statement") in reasonable detail and according to usual accounting practices
certified by Landlord and showing for the preceding Tax Year or fraction
thereof, as the case may be, Landlord's Tax Costs.

     (e)  For purposes of this Article "Landlord's Tax Costs" shall include:

          (i)  real estate taxes on the Building and Lot, installments and
               interest on assessments for public betterments or public
               improvements; and

         (ii)  reasonable expenses of any proceedings for abatement of taxes and
               assessments with respect to any Tax Year or fraction of a Tax
               Year;

     The term "real estate taxes" as used above shall mean all taxes of every
kind and nature assessed by any governmental authority on the Lot, the Building
and improvements, or both, which Landlord shall become obligated to pay because
of or in connection with the ownership, leasing and operation of the Lot, the
Building and improvements, or both, subject to the following: There shall be
excluded from such taxes all income taxes, excess profits taxes, excise taxes,
franchise taxes, and estate, succession, inheritance and transfer taxes,
provided, however, 

                                      -16-
<PAGE>
 
that if at any time during the Term the present system of ad valorem taxation of
real property shall be changed so that in lieu of the whole or any part of the
ad valorem tax on real property, there shall be assessed on Landlord a capital
levy or other tax on the gross rents received with respect to the Lot, Building
and improvements, or both, or a federal, state, county, municipal, or other
local income, franchise, excise or similar tax, assessment, levy or charge
(distinct from any now in effect) measured by or based, in whole or in part,
upon any such gross rents, then any and all of such taxes, assessments, levies
or charges, to the extent so measured or based, shall be deemed to be included
within the term "real estate taxes." If Landlord shall receive any tax refund or
reimbursement of taxes or sum in lieu thereof with respect to any Tax Year then
out of any balance remaining thereof after deducting Landlord's expenses
reasonably incurred in obtaining such refund, Landlord shall credit against
Tenant's next payment of Tax Excess, provided there does not then exist a
default of Tenant, an amount equal to Tenant's Proportionate Share of such
refund or reimbursement provided, that in no event shall Tenant be entitled to a
credit in excess of the amount of any payments made by Tenant on account of real
estate tax increases for such Tax Year pursuant to this Section 4.2.

     Notwithstanding any other provision of Section 4.2 hereof, if the Term
expires or is terminated as of a date other than the last day of a Fiscal Year
or Tax Year as applicable, then for such fraction of a Fiscal Year or Tax Year
at the end of the Term, Tenant's last payment to Landlord under Section 4.2
shall be made on the basis of Landlord's best estimate of the items otherwise
includable in Landlord's Statement or Landlord's Tax Statement and shall be made
on or before the later of (a) ten (10) days after Landlord delivers such
estimate to Tenant or (b) the last day of the Term, with an appropriate payment
or refund upon submission of Landlord's Statement or Landlord's Tax Statement as
applicable which statement shall represent Landlord's actual costs. Tenant shall
have the right, upon reasonable prior written notice to Landlord, to examine
Landlord's books and records with respect to the items in the aforementioned
Landlord's Statement or Landlord's Tax Statement during normal business hours,
provided that Landlord receive such notice within thirty (30) days following the
delivery to Tenant of Landlord's Statement.

4.3  ESTIMATED ESCALATION PAYMENTS.

     If, with respect to any fiscal year or tax year (as appropriate) or
fraction thereof during the Term, Landlord estimates that Tenant shall be
obligated to pay Operating Cost Escalation or Tax Escalation.  Then Tenant shall
pay, as additional rent, on the first day of each month of such fiscal year or
tax year (as appropriate) and each ensuing fiscal 

                                      -17-
<PAGE>
 
year thereafter, Estimated Monthly Escalation Payments equal to 1/12th of the
estimated Operating Cost Escalation for the respective fiscal year plus 1/12 of
the estimated Tax Escalation for the respective Tax Year, with an appropriate
additional payment or refund to be made within thirty (30) days after Landlord's
Statement or Landlord's Tax Statement as applicable is delivered to Tenant.
Landlord may adjust such Estimated Monthly Escalation Payment from time to time
and at any time during a fiscal year, and Tenant shall pay, as additional rent,
on the first day of each month following receipt of Landlord's notice thereof,
the adjusted Estimated Monthly Escalation Payment.

4.4  CHANGE OF FISCAL YEAR.

     Landlord shall have the right from time to time to change the periods of
accounting under Section 4.2 to any annual period other than a fiscal year, and
upon any such change all items referred to in this Section 4.4 shall be
appropriately apportioned.  In all Landlord's Statements rendered under this
Section 4.4, amounts for periods partially within and partially without the
accounting periods shall be appropriately apportioned, and any items which are
not determinable at the time of a Landlord's Statement shall be included therein
on the basis of Landlord's estimate, and with respect thereto Landlord shall
render promptly after determination a supplemental Landlord's Statement, and
appropriate adjustment shall be made according thereto.  All Landlord's
Statements shall be prepared on an accrual basis of accounting.

4.5  PAYMENTS.

     All payments of Annual Rent and additional rent shall be made to Managing
Agent, or to such other person as Landlord may from time to time designate.  If
any installment of Annual Rent or additional rent or on account of leasehold
improvements is paid more than five (5) days after the due date thereof, it
shall, at Landlord's election, bear interest at a rate equal to the average
prime commercial rate from time to time established by the three largest
national banks in Boston, Massachusetts plus 4% per annum from such due date,
which interest shall be immediately due and payable as further additional rent.

                                      -18-
<PAGE>
 
                                   ARTICLE V

                             LANDLORD'S COVENANTS

5.1  LANDLORD'S COVENANTS DURING THE TERM.

     Landlord covenants during the Term:

     5.1.1   Building Services - To furnish, through Landlord's employees or
independent contractors, the services listed in Exhibit D;

     5.1.2   Additional Building Services - To furnish, through Landlord's
employees or independent contractors, reasonable additional Building operation
services upon reasonable advance request of Tenant at equitable rates from time
to time established by Landlord to be paid by Tenant;

     5.1.3   Repairs - Except as otherwise provided in ARTICLE VII of this
Lease, to make such repairs to the roof, exterior walls, floor slabs, other
structural components and common facilities of the Building as may be necessary
to keep them in serviceable condition; and

     5.1.4   Quiet Enjoyment - That Landlord has the right to make this Lease
and that Tenant on paying the rent and performing its obligations hereunder
shall peacefully and quietly have, hold and enjoy the Premises throughout the
Term without any manner of hindrance or molestation from Landlord or anyone
claiming under Landlord, subject however to all the terms and provisions hereof.

5.2  INTERRUPTIONS.

     Landlord shall not be liable to Tenant for any compensation or reduction of
rent by reason of inconvenience or annoyance or for loss of business arising
from power losses or shortages or from the necessity of Landlord's entering the
Premises for any of the purposes authorized in this Lease or for repairing the
Premises or any portion of the Building or Lot.  In case Landlord is prevented
or delayed from making any repairs, alterations or improvements, or furnishing
any service or performing any other covenant or duty to be performed on
Landlord's part, by reason of any cause beyond Landlord's reasonable control,
Landlord shall not be liable to Tenant therefor, nor, except as expressly
otherwise provided in ARTICLE VII, shall Tenant be entitled to any abatement or
reduction of rent by reason thereof, nor shall the same give rise to a claim in
Tenant's favor that such failure constitutes actual or constructive, total or
partial, eviction from the Premises.

                                      -19-
<PAGE>
 
     Landlord reserves the right to stop any service or utility system when
necessary by reason of accident or emergency or until necessary repairs have
been completed.  Except in case of emergency repairs, Landlord will give Tenant
reasonable advance notice of any contemplated stoppage and will use reasonable
efforts to avoid unnecessary inconvenience to Tenant by reason thereof.

     Landlord also reserves the right to institute such policies, programs and
measures as may be necessary, required or expedient for the conservation or
preservation of energy or energy services or as may be necessary or required to
comply with applicable codes, rules, regulations or standards.


                                  ARTICLE VI

                              TENANT'S COVENANTS

6.1  TENANT'S COVENANTS DURING THE TERM.

     Tenant covenants during the Term and such further time as
Tenant occupies any part of the Premises:

     6.1.1   Tenant's Payments - To pay when due (a) all Annual Rent and
additional rent, (b) all taxes which may be imposed on Tenant's personal
property in the Premises (including, without limitation, Tenant's fixtures and
equipment) regardless to whomever assessed, (c) all charges by public utilities
for telephone and other utility services (including service inspections
therefor) rendered to the Premises not otherwise required hereunder to be
furnished by Landlord without charge and not consumed in connection with any
services required to be furnished by Landlord without charge and (d) as
additional rent, all charges of Landlord for services rendered pursuant to
Section 5.1.2 hereof;

     6.1.2   Repairs and Yielding Up - Except as otherwise provided in ARTICLE
VII and Section 5.1.3, to keep the Premises in good order, repair and condition,
reasonable wear only excepted; and at the expiration or termination of this
Lease peaceably to yield up the Premises and all changes and additions therein
in such order, repair and condition, first removing all goods and effects of
Tenant and any items, the removal of which is required by agreement or specified
herein to be removed at Tenant's election and which Tenant elects to remove, and
repairing all damage caused by such removal and restoring the Premises and
leaving them clean and neat;

                                      -20-
<PAGE>
 
     6.1.3   Occupancy and Use - To use and occupy the Premises only for the
Permitted Uses; not to injure or deface the Premises, Building, or Lot; and not
to permit in the Premises any use thereof which is improper, offensive, contrary
to law or ordinance, or liable to create a nuisance or to invalidate or increase
the premiums for any insurance on the Building or its contents or liable to
render necessary any alteration or addition to the Building;

     6.1.4   Rules and Regulations - To comply with the Rules and Regulations
set forth in Exhibit E and all other reasonable Rules and Regulations hereafter
made by Landlord, of which Tenant has been given notice, for the care and use of
the Building and Lot and their facilities and approaches, it being understood
that Landlord shall not be liable to Tenant for the failure of other tenants of
the Building to conform to such Rules and Regulations;

     6.1.5   Safety Appliances - To keep the Premises equipped with all safety
appliances required by law or ordinance or any other regulation of any public
authority because of any use made by Tenant and to procure all licenses and
permits so required because of such use and, if requested by Landlord, to do any
work so required because of such use, it being understood that the foregoing
provisions shall not be construed to broaden in any way Tenant's Permitted Uses;

     6.1.6   Assignment and Subletting - Not without the prior written consent
of Landlord to assign this Lease, to make any sublease, or to permit occupancy
of the Premises or any part thereof by anyone other than Tenant, voluntarily or
by operation of law (it being understood that in no event shall Landlord consent
to any such assignment, sublease or occupancy if the same is on terms more
favorable to the successor occupant than to the then occupant); as additional
rent, to reimburse Landlord promptly for reasonable legal and other expenses
incurred by Landlord in connection with any request by Tenant for consent to
assignment or subletting; no assignment or subletting shall affect the
continuing primary liability of Tenant (which, following assignment, shall be
joint and several with the assignee); no consent to any of the foregoing in a
specific instance shall operate as a waiver in any subsequent instance.
Landlord's consent to assignment or subletting by Tenant shall not be
unreasonably withheld, provided that such assignee or subtenant pays therefor
the greater of the Annual Rent and additional rent then payable hereunder, or
the then fair market rent for the Premises as reasonably determined by Landlord;
and provided further that Landlord shall not be deemed unreasonable for
withholding its consent to any assignment or subletting the arrangements for
which are to be made through any broker other than Landlord or its affiliates.
In the event that 

                                      -21-
<PAGE>
 
any assignee or subtenant pays to Tenant any amounts in excess of the Annual
Rent and additional rent then payable hereunder, or pro rata portion thereof on
a square footage basis for any portion of the Premises, Tenant shall promptly
pay said excess to Landlord as and when received by Tenant. If Tenant requests
Landlord's consent to assign this Lease or sublet more than twenty-five percent
(25%) of the Premises, Landlord shall have the option, exercisable by written
notice to Tenant given within ten (10) days after receipt of such request, to
terminate this Lease as of a date specified in such notice which shall not be
less than thirty (30) or more than sixty (60) days after the date of such
notice;

     6.1.7   Indemnity - To defend, with counsel reasonably acceptable to
Landlord, save harmless and indemnify Landlord from any liability for injury,
loss, accident or damage to any person or property and from any claims, actions,
proceedings and expenses and costs in connection therewith (including, without
implied limitation, reasonable counsel fees): (i) arising from the omission,
fault, willful act, negligence or other misconduct of Tenant or from any use
made or thing done or occurring on the Premises not due to the gross negligence
of Landlord or (ii) resulting from the failure of Tenant to perform and
discharge its covenants and obligations under this Lease;

     6.1.8   Tenant's Liability Insurance - To maintain public liability
insurance on the Premises in amounts which shall, at the beginning of the Term,
be at least equal to the limits set forth in Section 1.1 of this Lease, and from
time to time during the Term, shall be for such higher limits, if any, as are
customarily carried in the area in which the Premises are located on property
similar to the Premises and used for similar purposes and to furnish Landlord
with certificates thereof;

     6.1.9   Tenant's Worker's Compensation Insurance - To keep all of Tenant's
employees working in the Premises covered by worker's compensation insurance in
statutory amounts and to furnish Landlord with certificates thereof;

     6.1.10  Landlord's Right of Entry - To permit Landlord and Landlord's
agents entry: to examine the Premises at reasonable times and, if Landlord shall
so elect, to make repairs or replacements; to remove, at Tenant's expense, any
changes, additions, signs, curtains, blinds, shades, awnings, aerials, flagpoles
or the like to which Landlord has not consented in writing; and to show the
Premises to prospective tenants during the twelve (12) months preceding
expiration of the Term and to prospective purchasers and mortgagees at all
reasonable times;

                                      -22-
<PAGE>
 
     6.1.11  Loading - Not to place a load upon the Premises exceeding an
average rate of fifty (50) pounds of live load per square foot or floor area,
and not to move any safe, vault or other heavy equipment in, about or out of the
Premises except in such manner and at such times as Landlord shall in each
instance approve; Tenant's business machines and mechanical equipment which
cause vibration or noise that may be transmitted to the Building structure or to
any other leased space in the Building shall be placed and maintained by Tenant
in settings of cork, rubber, spring or other types of vibration eliminators
sufficient to eliminate such vibration or noise;

     6.1.12  Landlord's Costs - In case Landlord shall be made party to any
litigation commenced by or against Tenant or by or against any parties in
possession of the Premises or any part thereof claiming under Tenant, to pay, as
additional rent, all costs including, without implied limitation, reasonable
counsel fees incurred by or imposed upon Landlord in connection with such
litigation and, as additional rent, also to pay all such costs and fees incurred
by Landlord in connection with the successful enforcement by Landlord of any
obligations of Tenant under this Lease;

     6.1.13  Tenant's Property - All the furnishings, fixtures, equipment,
effects and property of every kind, nature and description of Tenant and of all
persons claiming by, through or under Tenant which, during the continuance of
this Lease or any occupancy of the Premises by Tenant or anyone claiming under
Tenant, may be on the Premises or elsewhere in the Building or on the Lot shall
be at the sole risk and hazard of Tenant and, if the whole or any part thereof
shall be destroyed or damaged by fire, water or otherwise, or by the leakage or
bursting of water pipes, steam pipes or other pipes, by theft, or from any other
cause, no part of said loss or damage is to be charged to or to be borne by
Landlord unless due to the gross negligence of Landlord;

     6.1.14  Labor or Materialmen's Liens - To pay promptly when due the entire
cost of any work done on the Premises by Tenant, its agents, employees or
independent contractors; not to cause or permit any liens for labor or materials
performed or furnished in connection therewith to attach to the Premises; and
immediately to discharge any such liens which may so attach;

     6.1.15  Changes or Additions - Not to make any changes or additions to
the Premises without Landlord's prior written consent, provided that Tenant
shall reimburse Landlord, as additional rent, for all costs incurred by Landlord
in reviewing Tenant's proposed changes or additions, and provided further that,
in order 

                                      -23-
<PAGE>
 
to protect the functional integrity of the Building, all such changes
and additions shall be performed by Managing Agent; and

     6.1.16  Holdover - To pay to Landlord one and one-half times the then fair
market rent as conclusively determined by Landlord or twice the total of the
Annual Rent and additional rent then applicable for each month or portion
thereof Tenant shall retain possession of the Premises or any part thereof after
the termination of this Lease, whether by lapse of time or otherwise, and also
to pay all damages sustained by Landlord on account thereof; the provisions of
this subsection shall not operate as a waiver by Landlord of the right of re-
entry provided in this Lease; at the option of Landlord exercised by a written
notice given to Tenant while such holding over continues, such holding over
shall constitute an extension of this Lease for a period of one year.

     6.1.17  Right of Financial Review - To allow Landlord and any holder of a
mortgage on the Premises to examine Tenant's books, including, without
limitation, its financial statements, operating statements and balance sheets
upon reasonable advance notice from Landlord to Tenant.  Such review shall be
conducted no more frequently than once in any six (6) month period.


                                  ARTICLE VII

                              CASUALTY AND TAKING

7.1  CASUALTY AND TAKING.

     In case during the Term all or any substantial part of the Premises,
Building or Lot, or any one or more of them, are damaged materially by fire or
any other cause or by action of public or other authority in consequence thereof
or are taken by eminent domain or Landlord receives compensable damage by reason
of anything lawfully done in pursuance of public or other authority, this Lease
shall terminate at Landlord's election, which may be made, notwithstanding
Landlord's entire interest may have been divested, by notice to Tenant within
thirty (30) days after the occurrence of the event giving rise to the election
to terminate, which notice shall specify the effective date of termination which
shall be not less than thirty (30) nor more than sixty (60) days after the date
of notice of such termination.  If in any such case the Premises are rendered
unfit for use and occupation and the Lease is not so terminated, Landlord shall
use due diligence to put the Premises, or, in case of a taking, what may remain
thereof (excluding any items installed or paid for by Tenant which Tenant may be
required or permitted to remove) into proper condition for use and occupation to
the extent permitted by the net award of 

                                      -24-
<PAGE>
 
insurance or damages available to Landlord, and a just proportion of the Annual
Rent and additional rent according to the nature and extent of the injury shall
be abated until the Premises or such remainder shall have been put by Landlord
in such condition; and in case of a taking which permanently reduces the area of
the Premises, a just proportion of the Annual Rent and additional rent shall be
abated for the remainder of the Term and an appropriate adjustment shall be made
to the Annual Estimated Operating Expenses.

7.2  RESERVATION OF AWARD.

     Landlord reserves to itself any and all rights to receive awards made for
damages to the Premises, Building or Lot and the leasehold hereby created, or
any one or more of them, accruing by reason of exercise of eminent domain or by
reason of anything lawfully done in pursuance of public or other authority.
Tenant hereby releases and assigns to Landlord all Tenant's rights to such
awards and covenants to deliver such further assignments and assurances thereof
as Landlord may from time to time request and hereby irrevocably designates and
appoints Landlord as its attorney-in-fact to execute and deliver to Tenant's
name and behalf all such further assignments thereof. It is agreed and
understood, however, that Landlord does not reserve to itself, and Tenant does
not assign to Landlord, any damages payable for (i) movable trade fixtures
installed by Tenant, or anybody claiming under Tenant, at its own expense or
(ii) relocation expenses recoverable by Tenant from such authority in a separate
action.


                                 ARTICLE VIII

                              RIGHTS OF MORTGAGEE

8.1  PRIORITY OF LEASE.

     This Lease is and shall continue to be subject and subordinate to any
presently existing mortgage or deed of trust of record covering the Lot or
Building or both (the "mortgaged premises"). The holder of such presently
existing mortgage or deed of trust shall have the election to subordinate the
same to the rights and interests of Tenant under this Lease exercisable by
filing with the appropriate recording office a notice of such election,
whereupon the Tenant's rights and interests hereunder shall have priority over
such mortgage or deed of trust.

     Unless the option provided for in the next following sentence shall be
exercised, this Lease shall be superior to and shall not be subordinate to, any
mortgage, deed of trust or other voluntary 

                                      -25-
<PAGE>
 
lien hereafter placed on the mortgaged premises. The holder of any such
mortgage, deed of trust or other voluntary lien shall have the option to
subordinate this Lease to the same, provided that such holder enters into an
agreement with Tenant by the terms of which the holder will agree to recognize
the rights of Tenant under this Lease and to accept Tenant as tenant of the
Premises under the terms and conditions of this Lease in the event of
acquisition of title by such holder through foreclosure proceedings or otherwise
and Tenant will agree to recognize the holder of such mortgage as Landlord in
such event, which agreement shall be made to expressly bind and inure to the
benefit of the successors and assigns of Tenant and of the holder and upon
anyone purchasing the mortgaged premises at any foreclosure sale. Any such
mortgage to which this Lease shall be subordinated may contain such terms,
provisions and conditions as the holder deems usual or customary.

8.2  RIGHTS OF MORTGAGE HOLDERS; LIMITATION OF MORTGAGEE'S LIABILITY.

     The word "mortgage" as used herein includes mortgages, deeds of trust or
other similar instruments evidencing other voluntary liens or encumbrances and
modifications, consolidations, extensions, renewals, replacements and
substitutes thereof. The word "holder" shall mean a mortgagee and any subsequent
holder or holders of a mortgage. Until the holder of a mortgage shall enter and
take possession of the Premises for the purpose of foreclosure, such holder
shall have only such rights of Landlord as are necessary to preserve the
integrity of this Lease as security. Upon entry and taking possession of the
Premises for the purpose of foreclosure, such holder shall have all the rights
of Landlord. Notwithstanding any other provision of this Lease to the contrary,
including without limitation Section 10.4, no such holder of a mortgage shall be
liable, either as mortgagee or as assignee, to perform, or be liable in damages
for failure to perform, any of the obligations of Landlord unless and until such
holder shall enter and take possession of the Premises for the purpose of
foreclosure, and such holder shall not in any event be liable to perform or
liable in damages for failure to perform the obligations of Landlord under
Section 3.1. Upon entry for the purpose of foreclosure, such holder shall be
liable to perform all of the obligations of Landlord (except for the obligations
under Section 3.1), subject to and with the benefit of the provisions of Section
10.4, provided that a discontinuance of any foreclosure proceeding shall be
deemed a conveyance under said provisions to the owner of the equity of the
Premises.

                                      -26-
<PAGE>
 
8.3  MORTGAGEE'S ELECTION.

     Notwithstanding any other provision to the contrary contained in this
Lease, if prior to substantial completion of Landlord's obligations under
Article III, any holder of a first mortgage on the mortgaged premises enters and
takes possession thereof for the purpose of foreclosing the mortgage, such
holder may elect, by written notice given to Tenant and Landlord at any time
within ninety (90) days after such entry and taking of possession, not to
perform Landlord's obligations under Article III, and in such event such holder
and all persons claiming under it shall be relieved of all obligations to
perform, and all liability for failure to perform, said Landlord's obligations
under Article III, and Tenant may terminate this Lease and all its obligations
hereunder by written notice to Landlord and such holder given within thirty (30)
days after the day on which such holder shall have given its notice as
aforesaid.

8.4  NO PREPAYMENT OR MODIFICATION, ETC.

     Tenant shall not pay Annual Rent, additional rent or any other charge more
than ten (10) days prior to the due dates thereof. No prepayment of Annual Rent,
additional rent or other charge, no assignment of this Lease and no agreement to
modify so as to reduce the rent, change the Term or otherwise materially change
the rights of Landlord under this Lease, or to relieve Tenant of any obligations
or liability under this Lease, shall be valid unless consented to in writing by
Landlord's mortgagees of record, if any.

8.5  NO RELEASE OR TERMINATION.

     No act or failure to act on the part of Landlord which would entitle Tenant
under the terms of this Lease, or by law, to be relieved of Tenant's obligations
hereunder or to terminate this Lease, shall result in a release or termination
of such obligations or a termination of this Lease unless (i) Tenant shall have
first given written notice of Landlord's act or failure to act to Landlord's
mortgagees of record, if any, specifying the act or failure to act on the part
of Landlord which could or would give basis to Tenant's rights and (ii) such
mortgagees, after receipt of such notice, have failed or refused to correct or
cure the condition complained of within a reasonable time thereafter, but
nothing contained in this Section 8.5 shall be deemed to impose any obligation
on any such mortgagee to correct or cure any such condition. "Reasonable time"
as used above means and includes a reasonable time to obtain possession of the
mortgaged premises, if the mortgagee elects to do so, and a reasonable time to
correct or cure the condition if such condition is determined to exist.

                                      -27-
<PAGE>
 
8.6  CONTINUING OFFER.

     The covenants and agreements contained in this Lease with respect to the
rights, powers and benefits of a mortgagee (particularly, without limitation
thereby, the covenants and agreements contained in this Article VIII) constitute
a continuing offer to any person, corporation or other entity, which by
accepting or requiring an assignment of this Lease or by entry or foreclosure
assumes the obligations herein set forth with respect to such mortgagee; such
mortgagee is hereby constituted a party to this Lease as an obligee hereunder to
the same extent as though its name were written herein as such; and such
mortgagee shall be entitled to enforce such provisions in its own name. Tenant
agrees on request of Landlord to execute and deliver from time to time any
agreement which may reasonably be deemed necessary to implement the provisions
of this Article VIII.

8.7  MORTGAGEE'S APPROVAL.

     Landlord's obligation to perform its covenants and agreements hereunder is
subject to the condition precedent that this Lease be approved by the holder of
any mortgage of which the Premises are a part and by the issuer of any
commitment to make a mortgage loan which is in effect on the date hereof.
Unless Landlord gives Tenant written notice within thirty (30) business days
after the date hereof that such holder or issuer, or both, disapprove this
Lease, then this condition shall be deemed to have been satisfied or waived and
the provisions of this Section 8.6 shall be of no further force or effect.


                                  ARTICLE IX

                                    DEFAULT

9.1  EVENTS OF DEFAULT.

     If any default by Tenant continues after notice, in case of Annual Rent,
additional rent, or any other monetary obligation to Landlord for more than ten
(10) days or, in any other case, for more than thirty (30) days and such
additional time, if any, as is reasonably necessary to cure the default if the
default is of such a nature that it cannot reasonably be cured in thirty (30)
days and Tenant diligently endeavors to cure such default; or if Tenant becomes
insolvent, fails to pay its debts as they fall due, files a petition under any
chapter of the U.S. Bankruptcy Code, 11 U.S.C. 101 et seq., as it may be amended
(or any similar petition 

                                      -28-
<PAGE>
 
under any insolvency law of any jurisdiction), or if such petition is filed
against Tenant; or if Tenant proposes any dissolution, liquidation, composition,
financial reorganization or recapitalization with creditors, makes an assignment
or trust mortgage for the benefit of creditors, or if a receiver, trustee,
custodian or similar agent is appointed or takes possession with respect to any
property of Tenant; or if the leasehold hereby created is taken on execution or
other process of law in any action against Tenant; then, and in any such case,
Landlord and the agents and servants of Landlord may, in addition to and not in
derogation of any remedies for any preceding breach of covenant, immediately or
at any time thereafter while such default continues and without further notice,
at Landlord's election, do any one or more of the following: (1) give Tenant
written notice stating that the Lease is terminated, effective upon the giving
of such notice or upon a date stated in such notice, as Landlord may elect, in
which event the Lease shall be irrevocably extinguished and terminated as stated
in such notice without any further action, or (2) with or without process of
law, in a lawful manner, enter and repossess the Premises as of Landlord's
former estate, and expel Tenant and those claiming through or under Tenant, and
remove its and their effects, without being guilty of trespass, in which event
the Lease shall be irrevocably extinguished and terminated at the time of such
entry, or (3) pursue any other rights or remedies permitted by law. Any such
termination of the Lease shall be without prejudice to any remedies which might
otherwise be used for arrears of rent or prior breach of covenant, and in the
event of such termination Tenant shall remain liable under this Lease as
hereinafter provided. Tenant hereby waives all statutory rights (including,
without limitation, rights of redemption, if any) to the extent such rights may
be lawfully waived, and Landlord, without notice to Tenant, may store Tenant's
effects and those of any person claiming through or under Tenant at the expense
and risk of Tenant and, if Landlord so elects, may sell such effects at public
auction or private sale and apply the net proceeds to the payment of all sums
due to Landlord from Tenant, if any, and pay over the balance, if any, to
Tenant.

9.2  TENANT'S OBLIGATIONS AFTER TERMINATION.

     In the event that this Lease is terminated under any of the provisions
contained in Section 9.1 or shall be otherwise terminated for breach of any
obligation of Tenant, Tenant covenants to pay forthwith to Landlord, as
compensation, (a) a sum equal to the tenant allowances paid by Landlord as set
forth in Article II and Article III and (b) the excess of the total rent
reserved for the residue of the Term over the rental value of the Premises for
said residue of the Term.  In calculating the rent reserved, there shall be
included, in addition to the Annual Rent and all additional rent, the value of
all other consideration agreed to be 

                                      -29-
<PAGE>
 
paid or performed by Tenant for said residue. Tenant further covenants as an
additional and cumulative obligation after any such ending to pay punctually to
Landlord all the sums and perform all the obligations which Tenant covenants in
this Lease to pay and to perform in the same manner and to the same extent and
at the same time as if this Lease had not been terminated. In calculating the
amounts to be paid by Tenant under the next foregoing covenant, Tenant shall be
credited with any amount paid to Landlord as compensation as provided in the
first sentence of this Section 9.2 and also with the net proceeds of any rents
obtained by Landlord by reletting the Premises, after deducting all Landlord's
expenses in connection with such reletting, including, without implied
limitation, all repossession costs, brokerage commissions, fees for legal
services and expenses of preparing the Premises for such reletting, it being
agreed by Tenant that Landlord may (i) relet the Premises or any part or parts
thereof for a term or terms which may at Landlord's option be equal to or less
than or exceed the period which would otherwise have constituted the balance of
the Term and may grant such concessions and free rent as Landlord in its sole
judgment considers advisable or necessary to relet the same and (ii) make such
alterations, repairs and decorations in the Premises as Landlord in its sole
judgment considers advisable or necessary to relet the same, and no action of
Landlord in accordance with the foregoing or failure to relet or to collect rent
under reletting shall operate or be construed to release or reduce Tenant's
liability as aforesaid.

     So long as at least twelve (12) months of the Term remain unexpired at the
time of such termination, in lieu of any other damages or indemnity and in lieu
of full recovery by Landlord of all sums payable under all the foregoing
provisions of this Section 9.2, Landlord may by written notice to Tenant, at any
time after this Lease is terminated under any of the provisions contained in
Section 9.l, or is otherwise terminated for breach of any obligation of Tenant
and before such full recovery, elect to recover, and Tenant shall thereupon pay,
as liquidated damages, an amount equal to the aggregate of the Annual Rent and
additional rent accrued under Article IV in the twelve (12) months ended next
prior to such termination plus the amount of Annual Rent and additional rent of
any kind accrued and unpaid at the time of termination and less the amount of
any recovery by Landlord under the foregoing provisions of this Section 9.2 up
to the time of payment of such liquidated damages.

     Nothing contained in this Lease shall, however, limit or prejudice the
right of Landlord to prove and obtain in proceedings for bankruptcy or
insolvency by reason of the termination of this Lease, an amount equal to the
maximum allowed by any statute or 

                                      -30-
<PAGE>
 
rule of law in effect at the time when, and governing the proceedings in which, 
the damages are to be proved, whether or not the amount be greater, equal to, or
less than the amount of the loss or damages referred to above.


                                   ARTICLE X

                                 MISCELLANEOUS

10.1 NOTICE OF LEASE.

     Upon request of either party, both parties shall execute and deliver, after
the Term begins, a short form of this Lease in form appropriate for recording or
registration, and if this Lease is terminated before the Term expires, an
instrument in such form acknowledging the date of termination.

10.2 INTENTIONALLY OMITTED.

10.3 NOTICES FROM ONE PARTY TO THE OTHER.

     All notices required or permitted hereunder shall be in writing and
addressed, if to the Tenant, at Tenant's Address or such other address as Tenant
shall have last designated by notice in writing to Landlord and, if to Landlord,
at Landlord's Address or such other address as Landlord shall have last
designated by notice in writing to Tenant.  Any notice shall be deemed duly
given when mailed to such address postage prepaid, registered or certified mail,
return receipt requested, or when delivered to such address by hand.

10.4 BIND AND INURE.

     The obligations of this Lease shall run with the land and this Lease shall
be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns, except that the Landlord named herein and
each successive owner of the Premises shall be liable only for the obligations
accruing during the period of its ownership. The obligations of Landlord shall
be binding upon the assets of Landlord which comprise the Premises but not upon
other assets of Landlord. No individual partner, trustee, stockholder, officer,
director, employee or beneficiary of Landlord shall be personally liable under
this Lease and Tenant shall look solely to Landlord's interest in the Premises
in pursuit of its remedies upon an event of default hereunder, and the general
assets of the individual partners, trustees, stockholders, officers, employees
or beneficiaries of Landlord

                                      -31-
<PAGE>
 
shall not be subject to levy, execution or other enforcement procedure for the
satisfaction of the remedies of Tenant.

10.5 NO SURRENDER.

     The delivery of keys to any employee of Landlord or to Landlord's agent or
any employee thereof shall not operate as a termination of this Lease or a
surrender of the Premises.

10.6 NO WAIVER, ETC.

     The failure of Landlord or of Tenant to seek redress for violation of, or
to insist upon the strict performance of, any covenant or condition of this
Lease or, with respect to such failure of Landlord, any of the Rules and
Regulations referred to in Section 6.1.4, whether heretofore or hereafter
adopted by Landlord, shall not be deemed a waiver of such violation nor prevent
a subsequent act, which would have originally constituted a violation, from
having all the force and effect of an original violation, nor shall the failure
of Landlord to enforce any of said Rules and Regulations against any other
tenant in the Building be deemed a waiver of any such Rules or Regulations.  The
receipt by Landlord of Annual Rent or additional rent with knowledge of the
breach of any covenant of this Lease shall not be deemed a waiver of such breach
by Landlord, unless such waiver be in writing and signed by Landlord.  No
consent or waiver, express or implied, by Landlord or Tenant to or of any breach
of any agreement or duty shall be construed as a waiver or consent to or of any
other breach of the same or any other agreement or duty.

10.7 NO ACCORD AND SATISFACTION.

     No acceptance by Landlord of a lesser sum than the Annual Rent and
additional rent then due shall be deemed to be other than on account of the
earliest installment of such rent due, nor shall any endorsement or statement on
any check or any letter accompanying any check or payment as rent be deemed as
accord and satisfaction, and Landlord may accept such check or payment without
prejudice to Landlord's right to recover the balance of such installment or
pursue any other remedy in this Lease provided.

10.8 CUMULATIVE REMEDIES.

     The specific remedies to which Landlord may resort under the terms of this
Lease are cumulative and are not intended to be exclusive of any other remedies
or means of redress to which it may be lawfully entitled in case of any breach
or threatened breach by Tenant of any provisions of this Lease. In addition to
the other remedies provided in this Lease, Landlord shall be

                                      -32-
<PAGE>
 
entitled to the restraint by injunction of the violation or attempted or
threatened violation of any of the covenants, conditions or provisions of this
Lease or to a decree compelling specific performance of any such covenants,
conditions or provisions.

10.9 LANDLORD'S RIGHT TO CURE.

     If Tenant shall at any time default in the performance of any obligation
under this Lease, Landlord shall have the right, but shall not be obligated, to
enter upon the Premises and to perform such obligation, notwithstanding the fact
that no specific provision for such substituted performance by Landlord is made
in this Lease with respect to such default.  In performing such obligation,
Landlord may make any payment of money or perform any other act.  All sums so
paid by Landlord (together with interest at the rate of 4% per annum in excess
of the then average prime commercial rate of interest being charged by the three
largest national banks in Boston, Massachusetts), and all necessary incidental
costs and expenses in connection with the performance of any such act by
Landlord, shall be deemed to be additional rent under this Lease and shall be
payable to Landlord immediately on demand.  Landlord may exercise the foregoing
rights without waiving any other of its rights or releasing Tenant from any of
its obligations under this Lease.

10.10     ESTOPPEL CERTIFICATE.

     Tenant agrees, from time to time, upon not less than fifteen (15) days'
prior written request by Landlord, to execute, acknowledge and deliver to
Landlord a statement in writing certifying that this Lease is unmodified and in
full force and effect; that Tenant has no defenses, offsets or counterclaims
against its obligations to pay the Annual Rent and additional rent and to
perform its other covenants under this lease; that there are no uncured defaults
of Landlord or Tenant under this Lease (or, if there have been modifications,
that this Lease is in full force and effect as modified and stating the
modifications and, if there are any defenses, offsets, counterclaims, or
defaults, setting them forth in reasonable detail); and the dates to which the
Annual Rent, additional rent and other charges have been paid. Any such
statement delivered pursuant to this Section 10.10 shall be in a form reasonably
acceptable to and may be relied upon by any prospective purchaser or mortgagee
of premises which include the Premises or any prospective assignee of any such
mortgagee.

                                      -33-
<PAGE>
 
10.11     WAIVER OF SUBROGATION.

     Any insurance carried by either party with respect to the Premises and
property therein or occurrences thereon shall include a clause or endorsement
denying to the insurer rights of subrogation against the other party to the
extent rights have been waived by the insured prior to occurrences of injury or
loss.  Each party, notwithstanding any provisions of this Lease to the contrary,
hereby waives any rights of recovery against the other for injury or loss due to
hazards covered by insurance containing such clause or endorsement to the extent
of the indemnification received thereunder.

10.12     ACTS OF GOD.

     In any case where either party hereto is required to do any act (other than
the payment of rent), delays caused by or resulting from Acts of God, war, civil
commotion, fire, flood or other casualty, labor difficulties, shortages of
labor, materials or equipment, government regulations, unusually severe weather
or other causes beyond such party's reasonable control shall not be counted in
determining the time during which work shall be completed, whether such time be
designated by a fixed date, a fixed time or a "reasonable time," and such time
shall be deemed to be extended by the period of such delay.

10.13     BROKERAGE.

     Tenant represents and warrants that it has dealt with no broker in
connection with this transaction other than Meredith & Grew, Incorporated and
agrees to defend, with counsel approved by Landlord, indemnify and save Landlord
harmless from and against any and all cost, expense or liability for any
compensation, commissions or charges claimed by a broker or agent, other than
with Meredith & Grew, Incorporated, with respect to Tenant's dealings in
connection with this Lease.

10.14     SUBMISSION NOT AN OFFER.

     The submission of a draft of this Lease or a summary of some or all of its
provisions does not constitute an offer to lease or demise the Premises, it
being understood and agreed that neither Landlord nor Tenant shall be legally
bound with respect to the leasing of the Premises unless and until this Lease
has been executed by both Landlord and Tenant and a fully executed copy has been
delivered to each of them.

                                      -34-
<PAGE>
 
10.15     APPLICABLE LAW AND CONSTRUCTION.

     This Lease shall be governed by and construed in accordance with the laws
of the state in which the Premises are located.  If any term, covenant,
condition or provision of this Lease or the application thereof to any person or
circumstances shall be declared invalid or unenforceable by the final ruling of
a court of competent jurisdiction having final review, the remaining terms,
covenants, conditions and provisions of this Lease and their application to
persons or circumstances shall not be affected thereby and shall continue to be
enforced and recognized as valid agreements of the parties, and in the place of
such invalid or unenforceable provision, there shall be substituted a like, but
valid and enforceable provision which comports to the findings of the aforesaid
court and most nearly accomplishes the original intention of the parties.

     There are no oral agreements between Landlord and Tenant affecting this
Lease.  The only written agreements between Landlord and Tenant other than this
Lease are (i) a letter agreement dated February 28, 1991 with respect to the
granting by Landlord to Tenant of a license to occupy certain storage space in
the Building (the "Letter Agreement"), (ii) a Lease dated February 28, 1991 and
(iii) a Lease dated June 11, 1992 as amended by a First Amendment to Lease dated
June 11, 1992 (the leases referred to in clauses (ii) and (iii) are hereinafter
referred to as the "Previous Leases").  As of the Commencement Date, the
Previous Leases, but not the Letter Agreement, shall be superseded by this Lease
and shall be deemed to be null and void, and either party, upon request of the
other party shall so certify.  This Lease may be amended, and the provisions
hereof may be waived and modified, only by instruments in writing executed by
Landlord and Tenant.

     The titles of the several Articles and Sections contained herein are for
convenience only and shall not be considered in construing this Lease.

     Unless repugnant to the context, the words "Landlord" and "Tenant"
appearing in this Lease shall be construed to mean those named above and their
respective heirs, executors, administrators, successors and assigns, and those
claiming through or under them respectively.  If there be more than one tenant,
the obligations imposed by this Lease upon Tenant shall be joint and several.

                                      -35-
<PAGE>
 
     EXECUTED as a sealed instrument on the day and year first above written.

                                   LANDLORD:  L&E INVESTMENT OF
                                              MASSACHUSETTS ONE, INC.


                                   By: /s/ David C. Sherwood
                                      ----------------------------------- 


                                   TENANT:  CREDIT TECHNOLOGIES,  INC.


                                   By: /s/ Pamela D.A. Reeve
                                      -----------------------------------
                                      Pamela D.A. Reeve, Its President


                                   By: /s/ William G. Brown
                                      -----------------------------------
                                      William G. Brown, Its Treasurer
                                        and Vice President of Finance

                                      -36-
<PAGE>
 
                                  EXHIBIT A-1
                                  -----------
<PAGE>
 
                           [FLOOR PLAN APPEARS HERE]
<PAGE>
 
                                  EXHIBIT A-2
                                  -----------
<PAGE>
 
                           [FLOOR PLAN APPEARS HERE]
<PAGE>
 
                                   EXHIBIT B
                                   ---------
<PAGE>
 
                           [FLOOR PLAN APPEARS HERE]
<PAGE>
 
                                   EXHIBIT C
                                   ---------
                               
                                Somerset Court
                               281 Winter Street
                            Waltham, Massachusetts
                               
                              BUILDING STANDARDS
                              ------------------

The Tenant will receive the following Tenant Improvements, which are included as
part of the Fixed Rent Rate.

1.   PARTITIONS:
     -----------

     a)  Demising partitions will be constructed of 3 5/8" metal studs with 5/8"
         gypsum wall board on each side. Demising partitions will extend from
         the finish floor to the underside of the floor deck above, subject to
         the requirements of the building and air conditioning system and the
         partition will be filled with 3" of fiberglass sound insulation.

     b)  Interior partitions will be constructed of 3 5/8" metal studs with 5/8"
         gypsum board on each side. Partitions will extend from the floor to the
         underside of the acoustical tile ceiling. Tenant allowance shall be as
         shown on attached Exhibit A.

2.   DOORS:
     ------

     a)  Each tenant will be allowed one entrance door of solid core oak, 3' x
         8'-4", with a door closer, lever handle mortise lock-set. Door frame
         will be natural finish oak.

     b)  Interior doors shall be 3' x 7' solid core oak in painted metal frames.
         Doors shall be finished natural with low sheen varnish and shall have
         80% lever latchsets. Tenant allowance shall be as shown on attached
         Exhibit A.

3.   PAINTING AND WALL COVERING:
     ---------------------------

     a)  All tenant partitions will receive two coats of latex paint. Color
         selection will be made from building standard samples with not more
         than one color per room. All partitions will have a 4" vinyl base.

                                      C-1
<PAGE>
 
     b)  Wall covering will be provided at Tenant's own expense and shall be
         subject to Landlord's approval prior to installation.

4.   FLOORS:
     ------ 

     Carpet shall be thirty (30) ounce commercial grade installed from building
     standard samples or from Landlord approved selection provided by Tenant.
     Vinyl tile may be substituted for carpet as required.

5.   CEILING:
     ------- 

     Ceilings will be 2' x 2' acoustic lay-in Armstrong Cortega Minaboard or
     equal tile. Ceiling height will be 8'-6".

6.   ELECTRICAL:  (as shown on attached PLAN A)
     ----------                                

          Device                                     Description
          ------                                     -----------

     Lighting Fixtures                           2' x 4' Parabolic

     Wall Switches                               Single Pole

     Electrical Outlets                          120v Duplex Wall Mount

7.   TELEPHONE:
     --------- 

     Wall telephone outlets will be provided as shown on attached Exhibit A and
     will consist of a cut out in the drywall partition with a pull string
     inside the partition to above the ceiling. Installation of all telephone
     wiring, which shall meet the requirements of the Massachusetts Electrical
     Code and the local building and electrical inspectors, is the
     responsibility of Tenant.

8.   SUN CONTROL BLINDS:
     ------------------ 

     a)   All windows will be 1" bronze insulated glass.

     b)   All perimeter windows will be provided with operable vertical
          Louverdrape blinds in building standard color.

9.   SPRINKLERS:
     ---------- 

     General office space shall have flushed mounted sprinkler heads as required
     by local laws and ordinances.

                                      C-2
<PAGE>
 
10.  HEATING AND AIR CONDITIONING:
     ----------------------------

     Cooling shall be provided from a central mechanical plant in the penthouse
     through a medium pressure manifold variable volume duct system.  Heating
     shall be provided with constant volume fan coil units or induction units
     connected to the duct system and installed in the ceiling plenum.

     Space thermostats and separate zones will be provided for approximately
     each 50 lineal feet of building perimeter and approximately each 2,500
     square feet of interior space.

     Supply air shall be provided through linear diffusers near the windows for
     the exterior zones and through slot diffusers for interior zones.

11.  MISCELLANEOUS:
     --------------

     a)   Each floor will have a drinking fountain accessible to all tenants.

     b)   Showers will be located in the second floor Men's and Women's toilet
          facilities.

All improvements not stated above will be provided by Tenant at its own expense.
Such improvements will be approved by Landlord prior to installation.

                                      C-3
<PAGE>
 
                                   EXHIBIT D
                                   ---------

                                Somerset Court
                               281 Winter Street
                            Waltham, Massachusetts

                              LANDLORD'S SERVICES
                              -------------------


I.   CLEANING

     A.   General

     1.   All cleaning work will be performed between 8 a.m. and 12 midnight,
          Monday through Friday, unless otherwise necessary for stripping,
          waxing, etc.

     2.   Abnormal waste removal (e.g., computer installation paper, bulk
          packaging, wood or cardboard crates, refuse from cafeteria operation,
          etc.) shall be Tenant's responsibility.

     B.   Daily Operations (5 times per week)

          1.   Tenant Areas

               a.   Empty and clean all waste receptacles; wash receptacles as
                    necessary.
               b.   Vacuum all rugs and carpeted areas.
               c.   Empty, damp-wipe and dry all ashtrays.

          2.   Lavatories

               a.   Sweep and wash floors with disinfectant.
               b.   Wash both sides of toilet seats with disinfectant.
               c.   Wash all mirrors, basins, bowls, urinals.
               d.   Spot clean toilet partitions.
               e.   Empty and disinfect sanitary napkin disposal receptacles.
               f.   Refill toilet tissue, towel, soap, and sanitary napkin
                    dispensers.

          3.   Public Areas

               a.   Wipe down entrance doors and clean glass (interior and
                    exterior).
               b.   Vacuum elevator carpets and wipe down doors and walls.
               c.   Clean water coolers.

                                      D-1
<PAGE>
 
     C.   Operations as Needed (but not less than every other day)

          1.   Tenant and Public Areas

               a.   Buff all resilient floor areas.

     D.   Weekly Operations

          1.   Tenant Areas, Lavatories, Public Areas

               a.   Hand-dust and wipe clean all horizontal surfaces with
                    treated cloths to include furniture, office equipment,
                    windowsills, door ledges, chair rails, baseboards, convector
                    tops, etc., within normal reach.
               b.   Remove finger marks from private entrance doors, light
                    switches, and doorways.
               c.   Sweep all stairways.

     E.   Monthly Operations

          1.   Tenant and Public Areas

               a.   Thoroughly vacuum seat cushions on chairs, sofas, etc.
               b.   Vacuum and dust grillwork.

          2.   Lavatories

               a.   Wash down interior walls and toilet partitions.

     F.   As Required and Weather Permitting

          1.   Entire Building

               a.   Clean inside of all windows.
               b.   Clean outside of all windows.

     G.   Yearly

          1.   Tenant and Public Areas

               a.   Strip and wax all resilient tile floor areas.
               b.   Shampoo carpet in common facilities as necessary in
                    Landlord's sole discretion.

                                      D-2
<PAGE>
 
II.  HEATING, VENTILATING, AND AIR CONDITIONING

     1.   Heating, ventilating, and air conditioning as required to provide
          reasonably comfortable temperatures for normal business day occupancy
          (excepting holidays); Monday through Friday from 8:00 a.m. to 5:00
          p.m. and Saturday from 8:00 a.m. to 1:00 p.m.

     2.   Maintenance of any additional or special air conditioning equipment
          and the associated operating cost will be at Tenant's expense.

III. WATER

     Hot water for lavatory purposes and cold water for drinking, lavatory and
     toilet purposes.

IV.  ELEVATORS (if Building is Elevatored)

     Elevators for the use of all tenants and the general public for access to
     and from all floors of the Building.
     Programming of elevators (including, but not limited to, service elevators)
     shall be as Landlord from time to time determines best for the Building as
     a whole.

V.   RELAMPING OF LIGHT FIXTURES

     Tenant will reimburse Landlord for the cost of lamps, ballasts and starters
     and the cost of replacing same within the Premises.

VI.  CAFETERIA AND VENDING INSTALLATIONS

     1.   Any space to be used primarily for lunchroom or cafeteria operation
          shall be Tenant's responsibility to keep clean and sanitary, it being
          understood that Landlord's approval of such use must be first obtained
          in writing.

     2.   Vending machines or refreshment service installations by Tenant must
          be approved by Landlord in writing and shall be restricted in use to
          employees and business callers.  All cleaning necessitated by such
          installations shall be at Tenant's expense.

VII. Electricity

     A.   Landlord, at Landlord's expense, shall furnish electrical energy
          required for lighting, electrical 

                                      D-3
<PAGE>
 
          facilities, equipment, machinery, fixtures, and appliances used in or
          for the benefit of Tenant's Space, in accordance with the provisions
          of the Lease of which this Exhibit is part.

     B.   Tenant shall not, without prior written notice to Landlord in each
          instance, connect to the Building electric distribution system any
          fixtures, appliances or equipment other than normal office machines
          such as desk-top calculators and typewriters, or any fixtures,
          appliances or equipment which Tenant on a regular basis operates
          beyond normal building operating hours.  In the event of any such
          connection, Tenant agrees to an increase in the ANNUAL ESTIMATED
          ELECTRICAL COST TO TENANT'S SPACE and a corresponding increase in
          Annual Rent by an amount which will reflect the cost to Landlord of
          the additional electrical service to be furnished by Landlord, such
          increase to be effective as of the date of any such installation.  If
          Landlord and cannot agree thereon, such amount shall be conclusively
          determined by a reputable independent electrical engineer or
          consulting firm to be selected by Landlord and paid equally by both
          parties, and the cost to Landlord will be included in Landlord's
          Operating Costs provided in Section 4.2 hereof.

     C.   Tenant's use of electrical energy in Tenant's Space shall not at any
          time exceed the capacity of any of the electrical conductors or
          equipment in or otherwise serving Tenant's Space.  In order to insure
          that such capacity is not exceeded and to avert possible adverse
          effect upon the Building electric service, Tenant shall not, without
          prior written notice to Landlord in each instance, connect to the
          Building electric distribution system any fixtures, appliances or
          equipment which operate on a voltage in excess of 120 volts nominal or
          make any alteration or addition to the electric system of Tenant's
          Space.  Unless Landlord shall reasonably object to the connection of
          any such fixtures, appliances or equipment, all additional risers or
          other equipment required therefor shall be provided by Landlord, and
          the cost thereof shall be paid by Tenant upon Landlord's demand.  In
          the event of any such connection, Tenant agrees to an increase in the
          ANNUAL ESTIMATED ELECTRICAL COST TO TENANT'S SPACE and a corresponding
          increase in Annual Rent by an amount which will reflect the cost to
          Landlord of the additional service to be furnished by Landlord, such
          increase to be effective as of the date of any such connection.  If
     
                                      D-4
<PAGE>
 
          Landlord and Tenant cannot agree thereon, such amount shall be
          conclusively determined by a reputable independent electrical engineer
          or consulting firm to be selected by Landlord and paid equally by both
          parties, and the cost to Landlord will be included in Landlord's
          Operating Costs provided in Section 4.2 hereof.

     D.   If at any time after the date of this Lease, the rates at which
          Landlord purchases electrical energy from the public utility supplying
          electric service to the Building, or any charges incurred or taxes
          payable by Landlord in connection therewith, shall be increased or
          decreased, the Annual Rent and ANNUAL ESTIMATED ELECTRICAL COST TO
          TENANT'S SPACE shall be increased or decreased, as the case may be, by
          an amount equal to the estimated increase or decrease, as the case may
          be, in Landlord's cost of furnishing the electricity referred to in
          Paragraph A above as a result of such increase or decrease in rates,
          charges, or taxes. If Landlord and Tenant cannot agree thereon, such
          amount shall be conclusively determined by a reputable independent
          electrical engineer or consulting firm to be selected by Landlord and
          paid equally by both parties, and the cost to Landlord will be
          included in Landlord's Operating Costs as provided in Section 4.2
          hereof. Any such increase or decrease shall be effective as of the
          date of the increase or decrease in such rate, charges, or taxes.

     E.   Landlord may, at any time, elect to discontinue the furnishing of
          electrical energy.  In the event of any such election by Landlord: (1)
          Landlord agrees to give reasonable advance notice of any such
          discontinuance to Tenant; (2) Landlord agrees to permit Tenant to
          receive electrical service directly from the public utility supplying
          service to the Building and to permit the existing feeders, risers,
          wiring and other electrical facilities serving Tenant's Space to be
          used by Tenant and/or such public utility for such purpose to the
          extent they are suitable and safely capable; (3)   Landlord agrees to
          pay such charges and costs, if any, as such public utility may impose
          in connection with the installation of Tenant's meters and to make or,
          at such public utility's election, to pay for such other installations
          as such public utility may require, as a condition of providing
          comparable electrical service to Tenant; (4) the Annual Rent shall be
          equitably decreased to reflect such discontinuance by an amount equal
          to the ANNUAL ESTIMATED ELECTRICAL COST TO TENANT'S SPACE then 

                                      D-5
<PAGE>
 
          in effect; and (5) Tenant shall thereafter pay, directly to the
          utility furnishing the same, all charges for electrical services to
          the Premises.

     F.   Whenever the Annual Rent is increased or decreased pursuant to any of
          the foregoing paragraphs of this Article, the parties agree, upon
          request of either, to execute and deliver each to the other an
          amendment to this Lease confirming such increase or decrease.

                                      D-6
<PAGE>
 
                                   EXHIBIT E
                                   ---------
                                
                                Somerset Court
                               281 Winter Street
                             Waltham, Massachusetts

                             RULES AND REGULATIONS
                             ---------------------


1.   The entrance, lobbies, passages, corridors, elevators and stairways shall
     not be encumbered or obstructed by Tenant, Tenant's agents, servants,
     employees, licensees or visitors or be used by them for any purpose other
     than for ingress and egress to and from the Premises.  The moving in or out
     of all sales, freight, furniture or bulky matter of any description must
     take place during the hours which Landlord may determine from time to time.
     Landlord reserves the right to inspect all freight and bulky matter to be
     brought into the Building and to exclude from the Building all freight and
     bulky matter which violates any of these Rules and Regulations or the Lease
     of which these Rules and Regulations are a part.

2.   No curtains, blinds, shades, screens or signs other than those furnished by
     Landlord shall be attached to, hung in or used in connection with any
     window or door of the Premises without the prior written consent of
     Landlord.  Interior signs on doors shall be painted or affixed for Tenant
     by Landlord or by sign painters first approved by Landlord at the expense
     of Tenant and shall be of a size, color and style acceptable to Landlord.

3.   No additional locks or bolts of any kind shall be placed upon any of the
     doors or windows by Tenant, nor shall any changes be made in existing locks
     or the mechanism thereof without the prior written consent of Landlord.
     Tenant must, upon the termination of its tenancy, restore to Landlord all
     keys of stores, shops, booths, stands, offices and toilet rooms, either
     furnished to or otherwise procured by Tenant, and in the event of the loss
     of any keys so furnished, Tenant shall pay to Landlord the cost thereof.

4.   Canvassing, soliciting and peddling in the Building are prohibited and
     Tenant shall cooperate to prevent the same.

5.   Tenant may request heating and/or air conditioning during other periods in
     addition to normal working hours by submitting its request in writing to
     the Building Manager's office not later than 2 p.m. the preceding workday
     (Monday through Friday) on forms available from the Building Manager.  

                                      E-1
<PAGE>
 
     The request shall clearly state the start and stop hours of the "off-hour"
     service. Tenant shall submit to the Building Manager a list of personnel
     who are authorized to make such requests. Charges are to be determined by
     the Building Manager on the additional hours of operations and shall be
     fair and reasonable and reflect the additional operating costs involved.

6.   Tenant shall comply with all security measures from time to time
     established by Landlord for the Building.

7.   Tenant shall be responsible for causing its visitors to park only in spaces
     or areas marked "Visitors Parking" and Tenant and its employees shall not
     park in spaces or areas marked "Visitor Parking" or "No Parking".  Landlord
     reserves the right to tow any cars parked in "Visitor Parking" or "No
     Parking" areas in violation of these rules and regulations at the sole
     expense of the owner of the improperly parked car.  Landlord reserves the
     right to designate reserved parking spaces for the Building's tenants.  If
     any parking spaces are designated as reserved for Tenant, Tenant and its
     employees shall park only in those parking spaces which have been reserved
     for Tenant and in those unmarked parking spaces which Tenant has the right
     to use in common with other tenants.  Tenant is responsible for policing
     any parking spaces reserved solely for its use and may tow any cars
     improperly parked in such reserved parking spaces.  Such towing must be
     done by a company approved by Landlord.  Tenant agrees, upon the request of
     Landlord, to provide Landlord with the license plate number and make and
     model of each of the cars which will be used by Tenant and its employees
     and shall specify which cars will be using the parking spaces reserved
     solely for Tenant's use.  Landlord is entitled to rely on the information
     provided to it by Tenant and need not make any further inquiry into the
     ownership of the cars on the Lot.  Violations of this Rule No. 7 shall be
     considered a default under the Tenant's lease and Landlord shall have all
     rights contained therein with respect to a default by Tenant.

                                      E-2
<PAGE>
 
                                   EXHIBIT F
                                   ---------

                           MANDATORY EXPANSION SPACE
                           -------------------------

                                      F-1
<PAGE>
 
                           [FLOOR PLAN APPEARS HERE]
<PAGE>
 
                            FIRST AMENDMENT TO LEASE

     This First Amendment to Lease is entered into as of the 31st day of May,
1994 by and between L & E INVESTMENT OF MASSACHUSETTS ONE, INC., a Delaware
corporation (the "Landlord"), and CREDIT TECHNOLOGIES, INC., a Delaware
corporation (the "Tenant").

                                R E C I T A L S
                                - - - - - - - -

     WHEREAS, Landlord and Tenant have entered into that certain Lease dated
September 21, 1993, (the "Lease") with respect to certain premises located in
the building ("Building") known and numbered as 281 Winter Street, Waltham,
Massachusetts and more particularly described in said Lease (the "Premises");

     WHEREAS, in accordance with Section 2.5 of the Lease Landlord has offered
to lease to Tenant and Tenant has accepted from Landlord 1,089 square feet of
space on the first floor of the Building, all as more fully set forth herein;
and

     WHEREAS, Landlord and Tenant therefore wish to amend the Lease in order to
reflect such expansion, subject to the terms and conditions set forth below;

     NOW, THEREFORE for good and valuable consideration the receipt and
sufficiency of which are hereby acknowledged, Landlord and Tenant hereby agree
as follows:

     1.   All capitalized terms used herein and not otherwise defined shall have
the meaning ascribed to such term in the Lease.

     2.   Effective as of August 1, 1994 the parties agree that 1,809 square
feet of adjacent space on the first floor of the Building (the "Expansion
Space") shall be added to the Premises and the definition of the term "TENANT'S
SPACE" set forth in Section 1.1 of the Lease shall be and hereby is amended by
deleting the first floor space plan attached as Exhibit A1 to the Lease and
substituting therefore the first floor space plan attached as Exhibit A1 to this
Amendment. Thereafter, all references to "Premises" or "Tenant's Space"
contained in the Lease shall be read to refer to the original 17,580 square feet
together with the Expansion Space being added by this Amendment and the terms
and provisions of the Lease, as the same may be amended hereby, shall apply to
said Expansion Space as fully as if it had been included in the Premises
originally demised, including without limitation those terms relating to the
payment of fixed and additional rent.
<PAGE>
 
     3.   Effective as of August 1, 1994 the definition of the term "RENTABLE
FLOOR OF TENANT'S SPACE: set forth in Section 1.1 of the Lease is hereby deleted
and the following is substituted therefore:

          "RENTABLE FLOOR AREA OF TENANT'S SPACE: 19,389 square
          feet (14,691 of which are on the first floor and 4,698
          of which are on the second floor), as the same may be
          increased pursuant to the terms hereof."

     4.   Effective as of August 1, 1994 the definition of the term "TENANT'S
PROPORTIONATE SHARE" set forth in Section 1.1 of the Lease is hereby amended by
deleting the phrase "25.93% (17,580 square feet divided by 67,800 square feet)"
and substituting "28.60% (19,389 square feet divided by 67,800 square feet)"
therefor.

     5.   Effective as of August 1, 1994 the definition of "PARKING  SPACES
ALLOCATED TO TENANT" set forth in Section 1.1 of the Lease is hereby amended by
deleting the phrase "Approximately 70 parking spaces" and substituting
"Approximately 78 parking spaces" therefor.

     6.   Landlord hereby agrees that on or before August 1, 1994 it remove the
existing demising wall separating the Expansion Space the original 17,580 square
feet premises, and Landlord agrees to use diligent efforts to ensure that
Tenant's use of the Premises is not unreasonably disrupted by such demolition.
Landlord further agrees that it will patch and paint the walls of the Expansion
Space in accordance with building standards.

     7.   Tenant represents and warrants that it has dealt with no broker in
connection with this Amendment other than Meredith & Grew, Incorporated and
agrees to defend, with counsel approved by Landlord, indemnify and save Landlord
harmless from and against any and all cost, expense or liability for any
compensation, commissions, or charges claimed by a broker or agent, other than
with Meredith & Grew, Incorporated, with respect to Tenant's dealings in
connection with this Amendment.

     8.   The terms and provisions of the Lease, as modified by this Amendment,
are hereby ratified and confirmed and the parties agree that said Lease, as so
modified, remains in full force and effect.

                                       2
<PAGE>
 
     EXECUTED under seal this as of the date first above written.

                                        LANDLORD:

                                        L & E INVESTMENT OF
                                        MASSACHUSETTS ONE, INC.



                                        By: /s/ David C. Sherwood
                                           --------------------------------
                                           Name: DAVID C. SHERWOOD       
                                           Its:  CEO

                                        TENANT:
                                        
                                        CREDIT TECHNOLOGIES, INC.


                                        By: /s/ William G. Brown
                                           --------------------------------
                                           Name: WILLIAM G. BROWN
                                           Its:  VICE PRESIDENT - FINANCE

                                       3
<PAGE>
 
                           [FLOOR PLAN APPEARS HERE]

<PAGE>
 
                                                                   EXHIBIT 10.10

                            HOBBS BROOK OFFICE PARK

                             Waltham, Massachusetts

                         LEASE dated September 26, 1994

                                   ARTICLE I

                                 REFERENCE DATA

     1.1  SUBJECTS REFERRED TO
          --------------------

     Each reference in this Lease to any of the following subjects shall be
construed to incorporate the data stated for that subject in this Article.

LANDLORD:  Middlesex Mutual Building Trust

LANDLORD'S ADDRESS:  P.O. Box 9198
                     Waltham, Massachusetts  02254-9198
                     Attention:  Real Estate Manager

TENANT:  Credit Technologies, Inc.

TENANT'S ORIGINAL ADDRESS:

ESTIMATED TERM COMMENCEMENT DATE:  October 1, 1994

TERM COMMENCEMENT DATE:  As defined in Section 2.4

TERM EXPIRATION DATE:  Six years from the Term Commencement Date

ANNUAL FIXED RENT:  $555,714.00

BASE OPERATING EXPENSES PER SQUARE FOOT OF RENTABLE FLOOR AREA:  Actual
Operating Expenses per square foot of rentable floor area for calendar year
1995.

BASE TAXES PER SQUARE FOOT OF RENTABLE FLOOR AREA:  Actual Taxes per square foot
of rentable floor area for calendar year 1994.

LAND:  The land upon which the Building is situated including parking areas,
garages, drives, walks, landscaped areas and other common areas serving the
Building.

BUILDING:  The entire building known and numbered as 235 Wyman Street, Waltham,
Massachusetts and all improvements on the Land but excluding any parking garage.

TOTAL RENTABLE FLOOR AREA OF BUILDING:  104,429 square feet.

PREMISES:  The space delineated on Exhibit A.

RENTABLE FLOOR AREA OF PREMISES:  27,108 square feet.

PERMITTED USES:  General Office

PUBLIC LIABILITY INSURANCE:  $1,000,000.00
<PAGE>
 
BROKER:  R.M. Bradley & Co., Inc. and Meredith & Grew

TENANT'S AUTHORIZED REPRESENTATIVE:

     1.2   EXHIBITS
           --------

     The following is a list of Exhibits attached to this Lease.

           Exhibit A.     Plan Premises.                           
                                                                   
           Exhibit B.     Tenant Standard Build Out Specifications.
                                                                   
           Exhibit C.     Landlord's Cleaning Specifications.       


                                  ARTICLE II

                        PREMISES; TERM; RENT; OPERATING
                           EXPENSES; AND ELECTRICITY

     2.1  PREMISES AND EXCLUSIONS
          -----------------------

     Landlord hereby leases to Tenant and Tenant hereby leases from Landlord the
Premises.  The Premises exclude common areas and facilities of the Building,
including without limitation exterior faces of exterior walls, the common
stairways and stairwells, entranceways and any lobby and courtyard areas,
elevators and elevator wells, fan rooms, electric and telephone closets, janitor
closets, freight elevator vestibules, and pipes, ducts, conduits, wires and
appurtenant fixtures serving other parts of the Building (exclusively or in
common) and other common areas and facilities.  If the Premises include less
than the entire rentable area of any floor, then the Premises also exclude the
common corridors, elevator lobby and toilets located on such floor.

     This Lease is subject to all easements, restrictions, agreements, and
encumbrances of record to the extent in force and applicable.

          2.1.1  RIGHT OF REFUSAL FOR SPACE IN BUILDING
                 --------------------------------------

     Subject to the rights of existing tenants, simultaneously with any offer to
lease space in the Building to any third party, Landlord shall offer to lease
such space to Tenant on the same terms and conditions as contained herein,
except (a) Tenant shall lease the space in question for a time period
coterminous with the term of this Lease, as it may be extended and (b) Fixed
Annual Rent shall be equal to the then prevailing market rate for space in the
Building.

     Any offer by Landlord under this Section 2.1.1 may be accepted by Tenant by
notice given within 10 days of receipt of

                                      -2-
<PAGE>
 
Landlord's offer.  In the event that Tenant accepts any offer by Landlord under
this section, the leasing of such additional space shall be documented by an
Amendment to this Lease.  Tenant's rights under this Section 2.1.1 shall be
rendered void, at Landlord's election, if Tenant is in default (after expiration
of any applicable notice and cure period) at the time Landlord offers any space
to a third party or at the time Tenant's lease of any space under this Section
2.1.1 would otherwise commence.

     2.2  APPURTENANT RIGHTS
          ------------------

     Tenant shall have, as appurtenant to the Premises, rights to use in common
(subject to reasonable rules of general applicability to tenants and other users
of the Building from time to time made by Landlord of which Tenant is given
notice):  (a) the common lobbies, corridors, stairways, elevators and loading
platform, and the pipes, ducts, conduits, wires and appurtenant meters and
equipment serving the Premises in common with others; (b) common driveways and
walkways necessary for access to the Building; (c) if the Premises include less
than the entire rentable floor area of any floor, the common toilets, corridors
and elevator lobby on such floor and serving the Premises; and (d) all other
areas or facilities in the Building from time to time intended for general use
by Tenant, other Building tenants, and Landlord.

     2.3  RESERVATIONS
          ------------

     Landlord reserves the right from time to time, without unreasonable
interruption (except in emergency) of Tenant's use:  (a) to install, use,
maintain, repair, replace and relocate for service to the Premises and other
parts of the Building, or either, pipes, ducts, conduits, wires and appurtenant
fixtures, wherever located in the Premises or the Building; and (b) to alter or
relocate any other common facility, including without limitation any lobby and
courtyard areas.  Installations, replacements and relocations referred to in
clause (a) above shall be located as far as practicable in the central core area
of the Building, above ceiling surfaces, below floor surfaces or within
perimeter walls of the Premises.

     2.4  TERM
          ----

     The Term shall begin at 12:01 a.m. on the earlier to occur of the following
(a) or (b), which date shall be the "Term Commencement Date," and shall end at
12:00 midnight on the Term Expiration Date set forth in Section 1.1.

          (a)  The date Tenant enters into possession of all or any portion of
the Premises for the conduct of its business.  (The event described in the prior
sentence shall not be deemed to occur by virtue of the installation or testing
of computers or other equipment or the installation of other property of Tenant
in the Premises.)

                                      -3-
<PAGE>
 
          (b)  The date the Premises are deemed ready for occupancy as defined
in Section 3.2.

          2.4.1  EXTENSION OPTION.  Tenant shall have the option to extend the
                 ----------------                                             
Term for one additional four year extension term (the "Extension Term") by
notice given to Landlord at least eight months before the Term Expiration Date.
Tenant's election shall be exercised, and Annual Fixed Rent for the Extension
Term determined, as set forth below.  If Tenant fails timely to exercise its
option for the Extension Term, Tenant shall have no further extension rights
hereunder.

     Tenant's option so to extend the Term shall be void, at Landlord's
election, if Tenant is in default (continuing beyond any applicable cure period)
at the time Tenant elects to extend the Term or at the time the Term would
expire but for such extension.  Any extension of the Term shall be applicable to
the entire Premises.  During the Extension Term, if any, all provisions of this
Lease shall apply except that Tenant shall have no further option to extend the
Term.

     During the Extension Term, Tenant shall pay Annual Fixed Rent equal to the
then prevailing market rate for a four year lease of office space in the greater
Boston, Massachusetts "Metro-West" area comparable to the Premises in terms of
location within a building, finish, age, building quality and amenities for a
tenant of equal size and financial strength as Tenant.

     Landlord shall notify Tenant of its estimate of the prevailing market rate
within ten (10) days after Tenant exercises the extension option.  Tenant shall
have the option to accept or reject by written notice Landlord's estimate, or to
withdraw its exercise of the extension option.  In the event Tenant rejects
Landlord's estimate then the prevailing market rate shall be arbitrated in
accordance with the following procedure.  Each of Landlord and Tenant, within
twenty (20) days after notice by Tenant disputing Landlord's estimate of the
prevailing market rate, shall appoint as an arbitrator an MAI appraiser with at
least ten years experience as an appraiser of Boston office buildings, including
first class suburban office buildings, and shall give notice of such appointment
to the other party.  If either Landlord or Tenant shall fail timely to appoint
an arbitrator, the other may apply to the Boston Office of the American
Arbitration Association ("AAA") for appointment of such an arbitrator if the
arbitrator has not been appointed within five business days after notice of such
failure has been given to the delinquent party.  The two arbitrators shall,
within five business days after appointment of the second arbitrator, appoint a
third arbitrator who shall be similarly qualified.  If the two arbitrators are
unable to agree timely on the selection of the third arbitrator, then both
arbitrators together may request such appointment from the Boston office of the
AAA.  The arbitration shall be conducted in accordance with the Commercial
Arbitration Rules of the AAA insofar as such rules are not inconsistent with

                                      -4-
<PAGE>
 
the provisions of this Lease (in which case the provisions of this Lease shall
govern), and the arbitrators shall be charged to reach a majority decision in
accordance with the standards provided in this Lease.  The prevailing market
rent rate shall be in accordance with the arbitrators' decision.  The cost of
the arbitration (exclusive of each party's witness and attorneys fees, which
shall be paid by such party) shall be borne equally by the parties.  If the AAA
shall cease to provide arbitration for commercial disputes in Boston, the second
or third arbitrator, as the case may be, shall be appointed by any successor
organization providing substantially the same services, and in the absence of
such an organization, by a court of competent jurisdiction under the arbitration
act of The Commonwealth of Massachusetts.

     For any portion of the Extension Term during which the prevailing market
rent is in dispute hereunder, Tenant shall make payment on account of Annual
Fixed Rent at the rate payable for the preceding lease year and the parties
shall adjust for over or under payments within twenty days after the decision of
the arbitrators is announced.

     Promptly after the Annual Fixed Rent is determined for the Extension Term,
Landlord and Tenant shall enter into an amendment of this Lease confirming the
extension of the Term and the new rate for Annual Fixed Rate.]

     2.5  ANNUAL FIXED RENT
          -----------------

     Tenant covenants and agrees to pay the Annual Fixed Rent in Section 1.1 to
Landlord in advance in equal monthly installments on the first day of each
calendar month during the Term.  All payments shall be due without billing or
demand and without deduction, setoff or counterclaim.  In order to induce Tenant
to enter into and perform this Lease, Landlord waives payment of Annual Fixed
Rent for the first two full months of the term.  Tenant shall make payment for
any portion of a month at the beginning or end of the Term.  All payments shall
be payable to Landlord at its Address, both as specified in Section 1.1, or to
such other entities at such other places as Landlord may from time to time
designate.

     2.6  ADDITIONAL CHARGES - OPERATING EXPENSES AND TAXES
          -------------------------------------------------

          2.6.1  ADDITIONAL CHARGES - GENERAL COVENANT.  Tenant covenants and
                 -------------------------------------                       
agrees to pay to Landlord, as additional charges, (i) an amount equal to the
product of (a) the Rentable Floor Area of the Premises and (b) the excess (if
any) of Landlord's Operating Expenses per square foot of Rentable Floor Area
over Base Operating Expenses per Square Foot of Rentable Floor Area and (ii) an
amount equal to the product of (a) the Rentable Floor Area of the Premises and
(b) the excess (if any) of Landlord's Taxes per square foot of Rentable Floor
Area over Base Taxes Per Square Foot of Rentable Floor Area, provided that if
less than

                                      -5-
<PAGE>
 
the Total Rentable Floor Area of the Building is occupied at any time during
such period, Landlord may reasonably extrapolate variable components of
Landlord's Operating Expenses as though the Total Rentable Floor Area of the
Building had been occupied at all times during such period.

     Appropriate adjustments (including adjustments in Base Operating Expenses
Per Square Foot of Rentable Floor Area and Base Taxes Per Square Foot of
Rentable Floor Area, which are quoted on an annual basis in Section 1.1) shall
be made for any portion of a year at the beginning or end of the Term or for any
year during which changes occur in the percentage of occupancy of the Building.

          2.6.2  PAYMENT.  Additional charges for Operating Expenses and Taxes
                 -------                                                      
under this Section 2.6 shall be paid for any portion of a month at the beginning
of the Term and thereafter in monthly installments on the first day of each
calendar month in amounts reasonably estimated by Landlord for the then current
calendar year.  Landlord may from time to time revise such estimates based on
available information relating to Landlord's Operating Expenses and Taxes or
otherwise affecting the calculation hereunder.  Within 90 days after the end of
each calendar year, Landlord will provide Tenant with an accounting of
Landlord's Operating Expenses and Taxes and other data necessary to calculate
additional charges hereunder for such calendar year prepared in accordance
herewith and otherwise in accordance with generally accepted accounting
principles.  Such statement shall be conclusive between the parties unless
fraudulently prepared.  Upon issuance thereof, there shall be an adjustment
between Landlord and Tenant for the calendar year covered by such accounting to
the end that Landlord shall have received the exact amount of additional charges
due hereunder.  Any overpayments by Tenant hereunder shall be credited against
the next payments of additional charges due under this Section 2.6, provided
there are no outstanding amounts due Landlord under this Lease at such time.
Any underpayments by Tenant shall be due and payable within ten (10) days of
delivery of Landlord's statement.  All amounts due under this Section 2.6.2
shall be payable without any abatement, counterclaim, set-off or deduction, and
the obligations of Tenant to pay the additional charges shall survive the
expiration of the Term.  With respect to the calendar year in which the Term
ends, the adjustment shall be pro rated for the portion of the year included in
the Term, but shall take place nevertheless at the times provided in the
preceding sentences.

          2.6.3  "LANDLORD'S OPERATING EXPENSES" - DEFINITION.  "Landlord's 
                 ---------------------------------------------         
Operating Expenses" means all costs of Landlord in owning, servicing, operating,
managing, maintaining, and repairing the Building, and providing services to
tenants including, without limitation, the costs of the following: (i) supplies,
materials and equipment purchased or rented, total wage and salary costs paid
to, and all contract payments made on account of, all persons engaged in the
operation, maintenance,

                                      -6-
<PAGE>
 
security, cleaning and repair of the Building and Land, including Social
Security, old age and unemployment taxes and so-called "fringe benefits"; (ii)
building services furnished to tenants of the Building at Landlord's expense
(including the types of services provided to Tenant pursuant to Section 4.1
hereof) and maintenance and repair of and services provided to or on behalf of
the Building performed by Landlord's employees or by other persons under
contract with Landlord; (iii) utilities consumed and expenses incurred in the
operation, maintenance and repair of the Building including, without limitation,
oil, gas, electricity (other than electricity to tenants in their Premises if
Tenant is directly responsible for payment under this Lease on account of
electricity consumed by Tenant), water, sewer and snow removal; (iv) casualty,
liability and other insurance, and unreimbursed costs incurred by Landlord which
are subject to an insurance deductible; (v) costs of operating any cafeteria,
other food services facility, or physical fitness facility for use of tenants
generally; and (vi) management fees.  If Landlord, in its sole discretion,
installs a new or replaced capital item for the purpose of reducing or
conserving the use of energy in the Building, complying with any building code
or other law, regulation, or legal requirement, complying with requirements of
any insurer, or otherwise relating to the operation of the Building, the cost of
such item amortized over a reasonable period with interest shall be included in
Landlord's Operating Expenses.  Landlord's Operating Expenses shall not include
any costs or expenses incurred by Landlord in the construction and development
of the Building including construction for tenants; payments of principal,
interest or other charges on mortgages; and salaries of executives or principals
of Landlord (except as the same may be reflected in the management fee for the
Building or attributable to actual Building operations).

     2.6.4  "LANDLORD'S TAXES"-DEFINITION.   "Landlord's Taxes" means all taxes,
            ------------------------------                                      
assessments and similar charges assessed or imposed on the Land for the then
current calendar year by any governmental authority attributable to the Building
(and, in the case of 404 Wyman Street, the parking garage) (including personal
property associated therewith).  The amount of any special taxes, special
assessments and agreed or governmentally imposed "in lieu of tax" or similar
charges shall be included in Landlord's Taxes for any year but shall be limited
to the amount of the installment (plus any interest, other than penalty
interest, payable thereon) of such special tax, special assessment or such
charge required to be paid during or with respect to the year in question.
Landlord's Taxes include expenses, including fees of attorneys, appraisers and
other consultants, incurred in connection with any efforts to obtain abatements
or reduction or to assure maintenance of Landlord's Taxes for any year wholly or
partially included in the Term, whether or not successful and whether or not
such efforts involved filing of actual abatement applications or initiation of
formal proceedings.  Landlord's Taxes exclude income taxes of general
application and all estate, succession, inheritance and transfer taxes.  If at
any time

                                      -7-
<PAGE>
 
during the Term there shall be assessed on Landlord, in addition to or lieu of
the whole or any part of the ad valorem tax on real or personal property, a
capital levy or other tax on the gross rents or other measures of building
operations, or a governmental income, franchise, excise or similar tax,
assessment, levy, charge or fee measured by or based, in whole or in part, upon
Building valuation, gross rents or other measures of building operations or
benefits of governmental services furnished to the Building, then any and all of
such taxes, assessments, levies, charges and fees, to the extent so measured or
based, shall be included within the term Landlord's Taxes, but only to the
extent that the same would be payable if the Building and Land were the only
property of Landlord.

     2.7  ELECTRICITY
          -----------

     Landlord shall furnish to Tenant throughout the Term electricity for the
operation of lighting fixtures, and 120 volt current for the operation of normal
office fixtures and equipment, but excluding any high energy consumption
equipment.  Tenant covenants and agrees to pay, as an additional charge, the
cost of such electricity, which shall be separately metered and billed to Tenant
monthly.

                                  ARTICLE III

                           CONSTRUCTION OF PREMISES

     3.1  COMPLETION DATE
          ---------------

     Subject to delay by causes beyond the reasonable control of Landlord or
caused by action or inaction of Tenant, Landlord shall endeavor, in good faith,
to have the Premises ready for Tenant's occupancy on the Estimated Term
Commencement Date.  Landlord's failure to have the Premises ready for Tenant's
occupancy on the Estimated Term Commencement Date, for any reason, shall not
give rise to any liability of Landlord hereunder, shall not constitute a
Landlord's default, shall not affect the validity of this Lease, and shall have
no effect on the beginning or end of the Term as otherwise determined hereunder
or on Tenant's obligations associated therewith.

     3.2  WHEN PREMISES DEEMED READY
          --------------------------

     The Premises shall be conclusively deemed ready for Tenant's occupancy as
soon as the obligations of Landlord as hereinafter specified have been
substantially completed by Landlord insofar as is practicable in view of delays
or defaults, if any, of Tenant or its contractors.  The Premises shall be deemed
to be ready for Tenant's occupancy if only minor or insubstantial details of
construction, decoration or mechanical adjustments remain to be done in the
Premises or any part thereof, or if the delay in the availability of the
Premises for occupancy is (i) due to special work, changes, alterations or
additions required

                                      -8-
<PAGE>
 
or made by Tenant in the layout or finish of the Premises or any part thereof,
(ii) cause in whole or in part by Tenant through the delay of Tenant in
submitting any plans and/or specifications, supplying information, approving
plans, specifications or estimates, giving authorizations or otherwise or (iii)
caused in whole or in part by delay and/or default on the part of Tenant or its
contractors.  If the Premises are deemed ready for Tenant's occupancy, Tenant
shall not (except with Landlord's consent) be entitled to take possession of the
Premises for the conduct of its business until the Premises are in fact actually
ready for such occupancy, notwithstanding the fact, because the Premises shall
have as above stated been deemed ready for such occupancy, that the Term hereof
shall on that account have commenced.  Landlord's architect's certificate of
substantial completion, or of any other facts pertinent to this Section 3.2,
shall be deemed conclusive of the statements therein contained and binding upon
Tenant.  Any of Landlord's work in the Premises not fully completed on the
Commencement Date shall thereafter be so completed with reasonable diligence by
Landlord.

     3.3  PLANS AND SPECIFICATIONS
          ------------------------

     Tenant shall be responsible to work with Landlord's architect in the
preparation of architectural, mechanical and electrical construction drawing,
plans and specifications (the "Plans") necessary to lay out the Premises for
Tenant's occupancy.  Tenant shall in a timely manner supply Landlord with all
information necessary to enable Landlord's architects to prepare the Plans and
shall promptly approve plans, specifications and estimates when so requested by
Landlord.

     3.4  CONSTRUCTION OF PREMISES
          ------------------------

     Except as is otherwise herein provided or as may be otherwise approved by
the Landlord, all work necessary to prepare the Premises for Tenant's occupancy,
including work to be performed at Tenant's expense, shall be performed
substantially in accordance with the Plans by contractors employed by Landlord.

     3.5  QUALITY AND COST OF MATERIALS
          -----------------------------

     Landlord shall bear all costs, not in excess of $15.00 per rentable square
foot of the Premises, of materials and workmanship to be furnished and installed
by Landlord in accordance with building standard as detailed and defined in
Exhibit "B".  Tenant shall bear all other costs of preparing the Premises for
its occupancy and shall pay such costs to Landlord upon request as an additional
charge hereunder.

     3.6  TENANTS DELAY-ADDITIONAL COSTS
          ------------------------------

     If Tenant fails or omits to make timely submission to Landlord of the
information referred to in Section 3.3, or other pertinent information, or
delays in submitting any other plans or

                                      -9-
<PAGE>
 
specifications, or in supplying information, or in approving plans,
specifications or estimates, or in giving authorizations or otherwise, any
additional costs to Landlord in connection with the completion of the Premises
in accordance with the terms of this Lease shall be promptly paid by Tenant to
Landlord as an additional charge, if such additional cost is the result of such
failure, omission or delay of Tenant.  For the purposes of the preceding
sentence, the expression "additional cost to Landlord" shall mean the cost over
and above such cost as would have been the aggregate cost to Landlord of
completing the Premises in accordance with the terms of this Lease had there
been no such failure, omission or delay.  Nothing contained in this Section 3.6
shall limit or qualify or prejudice any other covenants, agreements, terms,
provisions and conditions contained in this Lease, including, but not limited to
Section 3.2.

     3.7  ENTRY BY TENANT PRIOR TO TERM COMMENCEMENT DATE
          -----------------------------------------------

     With Landlord's prior written consent, Tenant shall have the right to enter
the Premises prior to the Term Commencement Date, without payment of rent, to
perform such work or decoration as is to be performed by, or under the direction
or control of, Tenant.  Such right of entry shall be deemed a license from
Landlord to Tenant, and entry thereunder shall be at the risk of Tenant.

     3.8  CONCLUSIVENESS OF LANDLORD'S PERFORMANCE
          ----------------------------------------

     By taking possession of the Premises, Tenant accepts the improvements in
the condition in which they may then be, and waives any right or claim against
Landlord arising out of the condition of the Premises, including the
improvements thereon, the appurtenances thereto, and the equipment thereof,
except defects in the workmanship and/or materials.  Tenant shall be deemed to
have waived any right or claim against Landlord arising out of a defect in
workmanship and/or materials on the date 9 months following the date on which
the Premises were ready for Tenant's occupancy if Tenant has not then given
written notice of such defect to Landlord.

                                  ARTICLE IV

                             LANDLORD'S COVENANTS

     4.1  LANDLORD'S COVENANTS
          --------------------

          4.1.1  BUILDING SERVICES.  Landlord shall furnish services, utilities,
                 -----------------                                              
facilities and supplies set forth in this Section 4.1.1 and in Exhibit C.
Exhibit C is intended to add detail to the provisions of the main body of the
Lease, and in case of conflict, the provisions of the main body of the Lease
shall control.  Tenant may obtain additional services, utilities, facilities and
supplies from time to time upon reasonable advance request or Landlord may
furnish the same without request if Landlord determines that Tenant's use or
occupancy of the

                                      -10-
<PAGE>
 
Premises necessitates the same (for example where the condition of the Premises
necessitates additional cleaning services), and, in either case, the cost of the
same at reasonable rates from time to time established by Landlord shall
constitute additional charges, payable upon billing.

          4.1.1.1  WATER CHARGES.  Landlord shall furnish hot and cold water for
                   -------------                                                
ordinary office cleaning, toilet, lavatory and drinking purposes.  If Tenant
requires, uses or consumes water for any other purpose, Landlord may assess on
tenant reasonable charges for additional water.

          4.1.1.2  ELEVATOR SERVICE.  Landlord shall provide necessary elevator
                   ----------------                                            
facilities on Mondays through Fridays excepting legal holidays from 8:00 a.m. to
1:00 a.m. and on Saturdays from 8:00 a.m. to 11:00 p.m. (such hours on such days
being referred to as "business days") and have at least one elevator serving the
Premises in operation available for Tenant's non-exclusive use at all other
times.

          4.1.1.3  CLEANING.  Landlord shall cause the common areas and the
                   --------                                                
office areas of the Premises to be kept reasonably clean provided the same are
maintained and kept in good order by Tenant.  Cleaning standards shall be in
accordance with Exhibit C.

          4.1.1.4  HEAT AND AIR-CONDITIONING.  Landlord shall, through the
                   -------------------------                              
Building heating and air-conditioning system, furnish to and distribute in the
Premises heat during the normal heating season on business days and air-
conditioning on business days when air-conditioning may reasonably be required
for the comfortable occupancy of the Premises by Tenant.  Landlord shall not be
required to furnish heat and air-conditioning in the Premises in excess of the
capacity of the equipment presently installed in the Building.  If Tenant
requires additional air-conditioning for business machines, meeting rooms or
other purposes, or because of occupancy or unusual electrical loads, any
additional air-conditioning units, chillers, condensers, compressors, ducts,
piping and other equipment and facilities will be installed and maintained by
Landlord at Tenant's sole cost, but only to the extent that the same are
compatible with the Building and its mechanical systems.

          4.1.1.5  ENERGY CONSERVATION.  Tenant agrees to cooperate with
                   -------------------                                  
Landlord and to abide by all Building regulations which Landlord may, from time
to time, prescribe for the proper functioning and protection of the heating and
air-conditioning systems and in order to maximize the effect thereof and to
conserve heat and air-conditioning.  Notwithstanding anything to the contrary in
this Section 4.1.1 or otherwise in this Lease, Landlord may institute such
policies, program and measures as may be in Landlord's judgment necessary,
required or expedient for the conservation or preservation of energy or energy
services, or as may be necessary to comply with applicable codes, rules,
regulations or

                                      -11-
<PAGE>
 
standards.

          4.1.2  REPAIRS.  Except as otherwise provided in this Lease, and
                 -------                                                  
except for repairs to items referred to below necessitated by Tenant's act or
neglect (which shall be Tenant's repair obligation under Section 5.1), Landlord
shall make such repairs to the roofs, exterior walls, exterior windows, floor
slabs, core walls, and common areas and facilities in the Building as may be
necessary to keep them in good condition.

          4.1.3  QUIET ENJOYMENT.  Landlord covenants that Tenant, on paying the
                 ---------------                                                
rent and performing the tenant obligations in this Lease, shall peacefully and
quietly have, hold and enjoy the Premises, free from any claim by Landlord or
persons claiming under Landlord, but subject to all of the terms and provisions
hereof, provisions of law and rights of record to which this Lease is or may
become subordinate.  This covenant is in lieu of any other so-called quiet
enjoyment covenant, either express or implied.

     4.2  INTERRUPTION
          ------------

     Exception for Landlord's negligence, Landlord shall not be liable to Tenant
for any compensation or reduction of rent by reason of inconvenience or
annoyance or for loss of business arising from the necessity of Landlord or its
agents entering the Premises for any of the purposes authorized in this Lease or
for repairing the Premises or from repairs by Landlord of any portion of the
Building however the necessity may occur.  If Landlord is prevented or delayed
from performing any covenant by reason of any cause reasonably beyond Landlord's
reasonable control, Landlord shall not be liable to Tenant therefor, nor, except
as otherwise provided in Section 6.1, shall Tenant be entitled to any abatement
or reduction of rent by reason thereof, nor shall the same give rise to a claim
by Tenant that such failure constitutes eviction from the Premises.  In no event
shall Landlord be liable for direct or consequential damages arising out of any
default by Landlord.

     Landlord reserves the right to stop any service or utility system, when
necessary by reason of accident or emergency, or until necessary repairs have
been completed; provided, however, that in each instance of stoppage, Landlord
shall exercise reasonable diligence to eliminate the cause thereof.  Except in
case of emergency repairs, Landlord will give Tenant reasonable advance notice
of any contemplated stoppage and will use reasonable efforts to avoid
unnecessary interruption of Tenant's use of the Premises by reason thereof.

                                   ARTICLE V

                         TENANT'S ADDITIONAL COVENANTS

     5.1  MAINTENANCE AND REPAIR
          ----------------------

                                      -12-
<PAGE>
 
     Except for damage by fire or casualty and reasonable wear, Tenant shall at
all times keep the Premises in good order and in as good repair, order and
condition as the same are at the beginning of the Term or may be put in
thereafter.  The foregoing shall include without limitation Tenant's obligation
to maintain floor coverings, to paint and repair walls and doors, to replace and
repair ceiling tiles, lights and light fixtures, drains and the like, and clean
the Premises to the extent such cleaning is not to be performed by Landlord
under Exhibit C.

     5.2  USE, WASTE AND NUISANCE
          -----------------------

     Throughout the Term, Tenant shall use the Premises for the Permitted Uses
only, and shall not use the Premises for any other purpose.  Tenant shall not
injure, overload, deface or commit waste in the Premises or any part of the
improvement on the Land, nor permit the emission therefrom of any objectionable
noise, light or odor, nor use or permit any use of the Premises which is
improper, offensive, contrary to law or ordinance or which is liable to
invalidate or increase the premium for any insurance on the Building or its
contents or which is liable to render necessary any alterations or additions in
the Building, nor obstruct in any manner any common portion of the Building.  If
Tenant's use of the Premises results in an increase in the premium for any
insurance on the Building or the contents thereof, Landlord shall notify Tenant
of such increase and Tenant shall pay same as additional charges.  Tenant may
not without Landlord's consent install in the Premises any pay telephones,
vending machines, water fountains, refrigerators, sinks or cooking equipment
provided that Landlord's consent will not be unreasonably withheld with respect
to items designed for the convenience of Tenant's employees which are customary
for office employees if Landlord determines that special venting or other
special alterations are not required in connection therewith.

     Tenant shall not (either with or without negligence) cause or permit the
escape, disposal or release of any biologically or chemically active or other
hazardous substances, or materials except in compliance with law.  Tenant shall
not allow the storage or use of such substances or materials in any manner not
sanctioned by law or by the highest standards prevailing in the industry for the
storage and use of such substances or materials, nor allow to be brought into
the Building any such materials or substances except to use in the ordinary
course of Tenant's business, and then only after written notice is given to
Landlord of the identity of such substances or materials.  Without limitation,
hazardous substances and materials shall include those described in the
Comprehensive Environmental Response, Compensation and Liability Act of 1980, as
amended, 42 U.S.C. (S)9601 et seq., the Resource Conservation and Recovery Act,
as amended, 42 U.S.C. (S)6901 et seq., the Massachusetts Hazardous Waste
Management Act, as amended, M.G.L. Chapter 21C, and the Massachusetts Oil and
Hazardous Material Release Prevention Act, as amended, M.G.L. Chapter 21E, and
the regulations adopted under

                                      -13-
<PAGE>
 
these acts.  If any lender or governmental agency shall ever require testing to
ascertain whether or not there has been any release of hazardous materials, then
the reasonable costs thereof shall be reimbursed by Tenant to Landlord upon
demand as additional charges if such requirement applies to the Premises, and if
the requirement applies to the Building generally, then such costs shall be
included in Landlord's Operating Expenses. In addition, Tenant shall execute
affidavits, representations and the like from time to time at Landlord's request
concerning Tenant's best knowledge and belief regarding the presence of
hazardous substances or materials on the Premises.  In all events, Tenant shall
indemnify Landlord in the manner elsewhere provided from any release of
hazardous materials on the Premises occurring while Tenant is in possession, or
elsewhere if caused by Tenant or persons acting under Tenant.

     5.3  RULES AND REGULATIONS
          ---------------------

     Tenant shall conform to all reasonable non-discriminatory rules and
regulations now or hereafter promulgated by Landlord for the care and use of the
Premises and the Building.

     5.4  SAFETY APPLIANCES
          -----------------

     Tenant shall keep the Premises equipped with all safety appliances and
permits which, as a result of Tenant's particular activities, are required by
law or ordinance or any order or regulation of any public authority, shall keep
the Premises equipped at all times with adequate fire extinguishers and other
such equipment reasonably required by Landlord, and, subject to Section 5.10,
shall make all repairs, alterations, replacements, or additions so required as a
result of Tenant's particular activities.

     5.5  INDEMNIFICATION
          ---------------

     Tenant shall indemnify, save harmless and defend Landlord, Landlord's
employees, agents, independent contractors and invitees, and any mortgagee
(collectively, "Indemnitees") from all liability, claim, or cost (including
reasonable fees of legal counsel of the Indemnitee's choice against whom Tenant
makes no reasonable objection) arising in whole or in part out of any injury,
loss or damage to any person or property while on the Premises, or in transit
thereto or therefrom, or out of any condition within the Premises if not due to
negligence of Landlord, or out of any breach of any Lease covenant by or any act
or omission of Tenant or Tenant's employees, agents, independent contractors or
invitees, in each case paying the same to Landlord on demand as additional rent.
The covenants of this Section shall survive the termination of the Term.  In
addition to the foregoing, Landlord may make all repairs and replacements to the
Building resulting from acts or omissions of Tenant's employees, agents,
independent contractors or invitees (including damage and breakage occurring
when Tenant's property is being

                                      -14-
<PAGE>
 
moved into or out of the Building) and Landlord may recover all costs and
expenses thereof from Tenant on demand as additional rent, to the extent not
insured against.

     5.6  INSURANCE
          ---------

     Tenant shall maintain throughout the Term (and such further time as Tenant
or any person claiming through Tenant occupies any part of the Premises or has
any liability for matters arising during the Term and such further time) in a
responsible company or companies approved by Landlord, comprehensive public
liability insurance against all claims for injury to persons or property in
connection with Tenants use of the Premises or the Land or Building and in form
satisfactory to Landlord, insuring Landlord and parties designated from time to
time by Landlord as additional insureds in an amount not less than the amount
specified in Section 1.1 (as such amount may, from time to time, be reasonably
increased by Landlord to correspond to similar buildings in the Greater Boston
area).  Such insurance shall provide that it will not be subject to
cancellation, termination, or change except after at least 30 days' prior
written notice to Landlord and parties designated by Landlord.  The policy or
policies, or a duly executed certificate or certificates for the same, together
with satisfactory evidence of the payment of the premium thereon, shall be
deposited with Landlord and additional insureds at the beginning of the Term
and, upon renewals of such policies, not less than 30 days prior to the
expiration of the term of such coverage.  If Tenant fails to comply with any of
the foregoing requirements, Landlord may obtain such insurance on behalf of
Tenant and may keep the same in effect, and Tenant shall pay Landlord, as
additional rent, the premium cost thereof upon demand.

     5.7  TENANT'S PROPERTY
          -----------------

     All furnishings, fixtures, equipment, effects and property of Tenant and
of all persons claiming through Tenant which from time to time may be on the
Premises or elsewhere in the Building or in transit thereto or therefrom shall
be at the sole risk of Tenant and shall be kept insured by Tenant throughout the
term at Tenant's expense and in prudent amounts, and if the whole or any part
thereof shall be destroyed or damaged by fire, water or otherwise, or by the
leakage or bursting of water pipes, steam pipes, or other pipes, by theft or
from any other cause, no part of said loss or damage is to be charged to or be
borne by Landlord.  The parties acknowledged that damage or destruction may
result from acts of cleaning personnel and employees of other independent
contractors of Landlord working in and around the Premises and that Tenant shall
bear the risk and cost thereof unless Landlord has been negligent in the
selection of such persons.

     5.8  ENTRY FOR REPAIRS AND INSPECTIONS
          ---------------------------------

                                      -15-
<PAGE>
 
     Tenant shall permit Landlord and its agents to enter and examine the
Premises at reasonable times and, if Landlord shall so elect, to make any
repairs or replacements Landlord may deem necessary or desirable, to remove at
Tenant's expense any alterations, additions, signs, curtains, blinds, shades,
awnings, aerials, flagpoles, or the like not consented to in writing, and to
show the Premises to prospective tenants during the eighteen months preceding
expiration of the Term and to prospective purchasers and mortgagees at all
times.  In case of an emergency in the Premises or in the Building, Landlord or
its representative may enter the Premises (forcibly, if necessary) at any time
to take such measures as may be needed to deal with such emergency.  Landlord
shall give Tenant reasonable notice prior to any such entry (except in the case
of an emergency) and shall use reasonable efforts to avoid interfering with
Tenant's use of the Premises during the course of such entry, provided, however,
that Landlord shall be under no obligation to conduct any such entry during
overtime periods or incur other premium pay expense.

     5.9  ASSIGNMENT, SUBLETTING
          ----------------------

     Tenant shall not assign this Lease, or sublet or license the Premises or
any portion thereof, or permit the occupancy of all or any portion of the
Premises by anybody other than Tenant (all or any of the foregoing actions are
referred to as "Subleases" and all or any of assignees, subtenants, licensees,
and other such parties are referred to as "Subtenants") without obtaining, on
each occasion, the prior consent of the Landlord, which consent shall not be
unreasonably withheld.  Unless Landlord's consent specifically provides
otherwise with respect to a particular proposed Subtenant, Tenant shall not
offer to make or enter into negotiations with respect to a Sublease to any of
the following:  (i) a tenant in the Hobbs Brook Office Park; (ii) any party with
whom Landlord or any affiliate of Landlord is then negotiating with respect to
space in the Hobbs Brook Office Park; (iii) any entity owned by, owning, or
affiliated with, directly or indirectly, any tenant or party described in
clauses (i) and (ii) hereof; or (iv) any party which would be of such type,
character or condition as to be inappropriate, in Landlord's judgment, as a
tenant for a first class office building.  Tenant shall not, without Landlord's
approval, offer to make or make a Sublease of all or any portion of the Premises
unless the aggregate rent and other charges payable to Tenant under such
Sublease equal or exceed the greater of (i) aggregate rent and other charges
payable hereunder (pro-rated for a Sublease of less than all of the Premises),
or (ii) the then prevailing rent rate being quoted for comparable space in Hobbs
Brook Office Park.  Tenant's request for consent to a Sublease shall include a
copy of the proposed Sublease instrument, if available, or else a statement of
the proposed Sublease in detail satisfactory to Landlord, together with
reasonably detailed financial, business and other information about the proposed
Subtenant.  Landlord shall have the option (but not the obligation) to terminate
the Lease with respect to the portion of the Premises which Tenant

                                      -16-
<PAGE>
 
proposes to Sublease effective upon the date of the proposed Sublease by giving
Tenant notice of such termination within 60 days after Landlord's receipt of
Tenant's request.  If Tenant does make a Sublease hereunder, and if the
aggregate rent and other charges payable to Tenant under and in connection with
such Sublease (including without limitation any amounts paid for leasehold
improvements or on account of Tenant's costs associated with such Sublease)
exceed the rent and other charges paid hereunder with respect to the space in
question, Tenant shall pay to Landlord, as an additional charge, the amount of
such excess.

     Tenant shall pay to Landlord, as an additional charge, Landlord's
reasonable legal fees and other expenses incurred in connection with any
proposed Sublease, including fees for review of documents and investigations of
proposed Subtenants.  Notwithstanding any such Sublease, the original Tenant
named herein shall remain directly and primarily obligated under this Lease.

     If Tenant enters into any Sublease with respect to the Premises (or any
part thereof), Landlord may, at any time and from time to time, require that
such Subtenant agree directly with Landlord to be liable, jointly and severally
with Tenant, to the extent of the obligation undertaken by or attributable to
such Subtenant, for the performance of Tenant's agreements under this Lease
(including payment of rent and other charges under the Sublease), and every
Sublease shall so provide.  Landlord may collect rent and other charges from the
Subtenant and apply the net amount collected to the rent and other charges
hereunder, but no assignment or collection shall be deemed a waiver of the
provisions of Section 5.9, or the acceptance of the Subtenant, as a tenant, or a
release of Tenant from direct and primary liability for the further performance
of Tenant's covenants hereunder.  The consent by Landlord to a particular
Sublease shall not relieve Tenant from the requirement of obtaining the consent
of Landlord to any further Sublease.

     5.10 ALTERATIONS
          -----------

     Except as provided in ARTICLE III with respect to initial construction,
Tenant shall make no alterations, additions or improvements to the Premises
without the prior written consent of Landlord and only in accordance with
complete construction documents approved in advance by Landlord. All such
alterations, additions and improvements shall be done only by contractors
approved in advance by Landlord. Tenant shall obtain all necessary permits
before undertaking any such alterations, additions or improvements and shall
carry such insurance and obtain such payment, performance and lien bonds as
Landlord shall require. Any alterations, additions and improvements to the
Premises, except movable furniture and trade fixtures, shall belong to Landlord.
All alterations, additions and improvements to the Premises shall be at Tenant's
sole cost. If any mechanic's lien (which term shall include all similar liens
relating to the furnishing of labor and materials) is filed against the Building
which is claimed to be attributable to

                                      -17-
<PAGE>
 
Tenant, its agents, employees or contractors, Tenant shall give immediate notice
of such lien to Landlord and shall discharge the same by payment or filing any
necessary bond within 10 days after Tenant has notice (from any source) of such
lien.  Landlord's approval of the construction documents shall signify
Landlord's consent to the work shown thereon only and Tenant shall be solely
responsible for any errors or omissions contained therein.

     5.11 SURRENDER
          ---------

     At the expiration of the Term or earlier termination of this Lease, without
the requirement of any notice, Tenant shall peaceably surrender the Premises
including all alterations and additions thereto and all replacements thereof,
including carpeting, any water or electricity meters, and all fixtures and
partitions, in any way bolted or otherwise attached to the Premises (which shall
become the property of Landlord) except such alterations and additions as
Landlord shall direct Tenant to remove, the Premises and improvements to be in
the condition in which the same are required to be maintained under Section 5.1.
Tenant shall, at the time of termination, remove the goods, effects and fixtures
which Tenant is directed or permitted to remove in accordance with the
provisions of this Section, making any repairs to the Premises and other areas
necessitated by such removal and leaving the Premises clean and tenantable.
Should Tenant fail to remove any of such goods, effects, and fixtures, Landlord
may have them removed forcibly, if necessary, and store any of Tenant's property
in a public warehouse at the risk of Tenant.  If such items are not removed from
storage within thirty (30) days, such items may be sold by any customary methods
in order to pay storage costs and other expenses of Landlord.  The expense of
such removal, storage and reasonable repairs necessitated by such removal shall
be borne by Tenant or reimbursed by Tenant to Landlord.

     5.12 PERSONAL PROPERTY TAXES
          -----------------------

     Tenant shall pay promptly when due all taxes (and charges in lieu thereof)
imposed upon Tenant's personal property in the Premises, no matter to whom
assessed (including, without limitation, fixtures and equipment).

                                   ARTICLE VI

                              CASUALTY AND TAKING

     6.1  DAMAGE BY FIRE OR CASUALTY
          --------------------------

     If the Premises or any part thereof shall be damaged by fire or other
insured casualty, then, subject to the last paragraph of this Section 6.1,
Landlord shall proceed with diligence, subject to then applicable statutes,
building codes, zoning ordinances and regulations of any governmental authority,
and at the expense

                                      -18-
<PAGE>
 
of Landlord (but only to the extent of insurance proceeds made available to
Landlord by any mortgagee of the Building) to repair or cause to be repaired
such damage.  All such repairs made necessary by any act or omission of Tenant
shall be made at the Tenant's expense to the extent that the cost of such
repairs are less than the deductible amount in Landlord's insurance policy.  All
repairs to and replacements of property which Tenant is entitled to remove shall
be made by and at the expense of Tenant.  If the Premises or any part thereof
shall have been rendered unfit for use and occupation hereunder by reason of
such damage the Fixed Rent or a just and proportionate part thereof, according
to the nature and extent to which the Premises shall have been so rendered
unfit, shall be abated until the Premises (except as to the property which is to
be repaired by or at the expense of Tenant) shall have been restored as nearly
as practicable to the condition in which they were immediately prior to such
fire or other casualty, provided, however, that if Landlord or any mortgagee of
the Building shall be unable to collect the insurance proceeds (including rent
insurance proceeds) applicable to such damage because of some action or inaction
on the part of Tenant, or the employees, licensees or invitees of Tenant, the
cost of repairing such damage shall be paid by Tenant and there shall be no
abatement of rent.  Landlord shall not be liable for delays in the making of any
such repairs which are due to government regulation, casualties and strikes,
unavailability of labor and materials, delays in obtaining insurance proceeds,
and other causes beyond the reasonable control of Landlord, nor shall Landlord
be liable for any inconvenience or annoyance to Tenant or injury to the business
of Tenant resulting from delays in repairing such damage.

     If (i) the Premises are so damaged by fire or other casualty (whether or
not insured) at any time during the last thirty months of the Term that the cost
to repair such damage is reasonably estimated to exceed one-third of the total
Annual Fixed Rent payable hereunder for the period from the estimated completion
date of repair until the end of the Term, (ii) at any time the Building (or any
portion thereof, whether or not including any portion of the Premises) is so
damaged by fire or other casualty (whether or not insured) that substantial
alteration or reconstruction or demolition of the Building (or a portion
thereof) shall in Landlord's judgment be required, or (iii) at any time damage
to the Building occurs by fire or other insured casualty and any mortgagee shall
refuse to permit insurance proceeds to be utilized for the repair or replacement
of such property and Landlord determines not to repair such damage, then and in
any of such events, this Lease and term hereof may be terminated at the election
of Landlord by a notice from Landlord to Tenant within sixty (60) days, or such
longer period as is required to complete arrangements with any mortgagee
regarding such situation, following such fire or other casualty; the effective
termination date pursuant to such notice shall be not less than thirty (30) days
after the day on which such termination notice is received by Tenant.  In the
event of any

                                      -19-
<PAGE>
 
termination, the Term shall expire as though such effective termination date
were the date originally stipulated in Section 1.1 for the end of the Term and
the Fixed Rent and additional charges for Operating Expenses shall be
apportioned as of such date.

     6.2  CONDEMNATION - EMINENT DOMAIN
          -----------------------------

     In case during the Term all or any substantial part of the Premises or the
Building are taken by eminent domain or Landlord receives compensable damage by
reason of anything lawfully done in pursuance of public or other authority,
this Lease shall terminate at Landlord's election, which may be made
(notwithstanding that Landlord's entire interest may have been divested) by
notice given to Tenant within 90 days after the election to terminate arises,
specifying the effective date of termination. The effective date of termination
specified by Landlord shall not be less than 15 nor more than 30 days after the
date of notice of such termination. Unless terminated pursuant to the foregoing
provisions, this Lease shall remain in full force and effect following any such
taking, subject, however, to the following provisions. If in any such case the
Premises are rendered unfit for use and occupation and this Lease is not
terminated, Landlord shall use due diligence (following the expiration of the
period in which Landlord may terminate this Lease pursuant to the foregoing
provisions of this Section) to put the Premises, or what may remain thereof
(excluding any items installed or paid for by Tenant which Tenant may be
required to remove pursuant to Section 5.10), into proper condition for use and
occupation and a just proportion of the Fixed Rent and additional charges for
Operating Expenses according to the nature and extent of the injury shall be
abated until the Premises or such remainder shall have been put by Landlord in
such condition; and in case of a taking which permanently reduces the area of
the Premises, a just proportion of the Fixed Rent and additional charges for
Operating Expenses shall be abated for the remainder of the Term.


     6.3  EMINENT DOMAIN AWARD
          --------------------

     Landlord reserves to itself any and all rights to receive awards made for
damages to the Premises, the Building or the leasehold hereby created, or any
one or more of them accruing by reason of exercise of eminent domain
or by reason of anything lawfully done in pursuance of public or other
authority. Tenant hereby releases and assigns to Landlord all Tenant's rights to
such awards, and covenants to deliver such further assignments and assurances
thereof as Landlord may from time to time request, hereby irrevocably
designating and appointing Landlord as its attorney-in-fact to execute and
deliver in Tenant's name and behalf all such further assignments thereof.
Nothing contained in this Section shall prevent Tenant from bringing a separate
action or proceeding for compensation for any of Tenant's property taken and
Tenant's moving expenses.

                                      -20-
<PAGE>
 
                                  ARTICLE VII

                                    DEFAULT

     7.1  TERMINATION FOR DEFAULT OR INSOLVENCY
          -------------------------------------

     This Lease is upon the condition that (1) if Tenant shall fail to perform
or observe any of Tenant's covenants, and if such failure shall continue, (a) in
the case of rent or payment of additional charges or any sum due Landlord
hereunder, for more than ten (10) days, or (b) in any other case, after notice,
for more than thirty (30) days (provided that if correction of any such matter
reasonably requires longer than 30 days and Tenant so notifies Landlord within
20 days after Landlord's notice is given together with an estimate of time
required for such cure, Tenant shall be allowed such longer period, but only if
cure is begun within such 30-day period and such delay does not cause increased
risk of damage to person or property), or (2) if three or more notices under
clause (1) hereof are given in any twelve month period (failure to pay rent or
any other sum for more than 3 days after the particular due date shall have the
same effect under this clause (2) as such a notice); (3) if the leasehold hereby
created shall be taken on execution, or by other process of law, or if any
assignment shall be made of Tenant's property or the property of any guarantor
of Tenant's obligations hereunder ("Guarantor") for the benefit of creditors; or
(4) if a receiver, guardian, conservator, trustee in bankruptcy or similar
officer shall be appointed by a court of competent jurisdiction to take charge
of all or any part of Tenant's or the Guarantor's property and such appointment
is not discharged within 90 days thereafter or if a petition including, without
limitation, a petition for reorganization or arrangement is filed by Tenant or
the Guarantor under any bankruptcy law or is filed against Tenant or the
Guarantor and, in the case of a filing against Tenant only, the same shall not
be dismissed within 90 days from the date upon which it is filed, then, and in
any of said cases, Landlord may, immediately or at any time thereafter, elect to
terminate this Lease by notice of termination, by entry, or by any other means
available under law and may recover possession of the Premises as provided
herein.  Upon termination by notice, by entry, or by any other means available
under law, Landlord shall be entitled immediately, in the case of termination by
notice or entry, and otherwise in accordance with the provisions of law to
recover possession of the Premises from Tenant and those claiming through or
under the Tenant.  Such termination of this Lease and repossession of the
Premises shall be without prejudice to any remedies which Landlord might
otherwise have for arrears of rent or for a prior breach of the provisions of
this Lease.  Tenant waives any statutory notice to quit and equitable rights in
the nature of further cure or redemption, and Tenant agrees that upon Landlord's
termination of this Lease Landlord shall be entitled to re-entry and possession
in accordance with the terms hereof.  Landlord may, without notice, store
Tenant's personal property (and those of any person claiming under Tenant) at
the expense

                                      -21-
<PAGE>
 
and risk of Tenant or, if Landlord so elects, Landlord may sell such personal
property at public auction or auctions or at private sale or sales after seven
days notice to Tenant and apply the net proceeds to the earliest of installments
of rent or other charges owing Landlord.  Tenant agrees that a notice by
Landlord alleging any default shall, at Landlord's option (the exercise of such
option shall be indicated by the inclusion of the words "notice to quit" in such
notice), constitute a statutory notice to quit.  If Landlord exercises its
option to designate a notice of default hereunder as a statutory notice to quit,
any grace periods provided for herein shall run concurrently with any statutory
notice periods.  Landlord and Tenant waive trial by jury in any action to which
they are parties.

     7.2  REIMBURSEMENT OF LANDLORD'S EXPENSES
          ------------------------------------

     In the case of termination of this Lease pursuant to Section 7.1, Tenant
shall reimburse Landlord for all expenses arising out of such termination,
including without limitation, all costs incurred in collecting amounts due from
Tenant under this Lease (including attorneys' fees, costs of litigation and the
like); all expenses incurred by Landlord in attempting to relet the Premises or
parts thereof (including advertisements, brokerage commissions, Tenant's
allowances, costs of preparing space, and the like); all of Landlord's then
unamortized cost of special inducements provided to Tenant (including without
limitation rent holidays, rent waivers, above building standard leasehold
improvements, and the like) and all Landlord's other reasonable expenditures
necessitated by the termination.  The reimbursement from Tenant shall be due and
payable immediately from time to time upon notice from Landlord that an expense
has been incurred, without regard to whether the expense was incurred before or
after the termination.

     7.3  DAMAGES
          -------

     Landlord may elect by written notice to Tenant within one year following
such termination to be indemnified for loss of rent by a lump sum payment
representing the then present value of the amount of rent and additional
charges which would have been paid in accordance with this Lease for the
remainder of the Term minus the then present value of the aggregate fair market
rent and additional charges payable for the Premises for the remainder of the
Term (if less than the rent and additional charges payable hereunder), estimated
as of the date of the termination, and taking into account reasonable
projections of vacancy and time required to re-lease the Premises.  (For the
purposes of calculating the rent which would have been paid hereunder for the
lump sum payment calculation described herein, the last full year's additional
charges under Section 2.6 is to be deemed constant for each year thereafter.
The Federal Reserve discount rate (or equivalent) shall be used in calculating
present values.)  Should the parties be unable to agree on a fair market rent,
the matter shall be submitted, upon the demand of

                                      -22-
<PAGE>
 
either party, to the Boston, Massachusetts office of the American Arbitration
Association, with a request for arbitration in accordance with the rules of the
Association by a single arbitrator who shall be an MAI appraiser with at least
ten years experience as an appraiser of major office buildings in the Greater
Boston area.  The parties agree that a decision of the arbitrator shall be
conclusive and binding upon them.  If, at the end of the Term, the rent which
Landlord has actually received from the Premises is less than the aggregate fair
market rent estimated as aforesaid, Tenant shall thereupon pay Landlord the
amount of such difference.  Should Landlord fail to make the election provided
for in this Section 7.3, Tenant shall indemnify Landlord for the loss of rent by
a payment at the end of each month which would have been included in the Term,
representing the difference between the rent which would have been paid in
accordance with this Lease (Annual Fixed Rent under Section 2.5, and additional
charges which would have been payable under Section 2.6 to be ascertained
monthly) and the rent actually derived from the Premises by Landlord for such
month (the amount of rent deemed derived shall be the actual amount less any
portion thereof attributable to Landlord's reletting expenses described in
Section 7.2 which have not been reimbursed by Tenant thereunder).

     7.4  MITIGATION
          ----------

     Any obligation imposed by law upon Landlord to relet the Premises shall be
subject to the reasonable requirements of Landlord to lease to high quality
tenants and to develop the Building in a harmonious manner with an appropriate
mix of uses, tenants, floor areas and terms of tenancies, and the like.

     7.5  CLAIMS IN BANKRUPTCY
          --------------------

     Nothing herein shall limit or prejudice the right of Landlord to prove and
obtain in a proceeding for bankruptcy, insolvency, arrangement or
reorganization, by reason of the termination, an amount equal to the maximum
allowed by a statute or law in effect at the time when, and governing the
proceedings in which, the damages are to be proved, whether or not the amount is
greater to, equal to, or less than the amount of the loss or damage which
Landlord has suffered.

     7.6  INTEREST ON UNPAID AMOUNTS
          --------------------------

     If any payment of Annual Fixed Rent, additional charges, or other payment
due from Tenant to Landlord is not paid within ten (10) days of the due date,
then without notice and in addition to all other remedies hereunder, Tenant
shall pay to Landlord interest on such unpaid amount equal to 1.5% of the amount
in question for each month and for each part thereof during which said
delinquency continues; provided, however, in no event shall such interest exceed
the maximum amount permitted to be charged by applicable law.

                                      -23-
<PAGE>
 
     7.7  VACANCY DURING LAST SIX MONTHS
          ------------------------------

     If Tenant vacates substantially all of the Premises (or substantially all
of any major portion of the Premises, including a floor thereof) at any time
within the last 6 months of the Term, Landlord may enter the Premises (or such
portion) and commence demolition work or construction of leasehold improvements
for future tenants.  The exercise of such right by Landlord will not affect
Tenant's obligations to pay Annual Fixed Rent or additional charges with respect
to the Premises (or such portion), which obligations shall continue without
abatement until the end of the Term.

                                 ARTICLE VIII

                                 MISCELLANEOUS

     8.1  HOLDOVER
          --------

     If Tenant remains in the Premises after the termination or expiration of
the Term, such holding over shall be an a tenant at will or tenant by the month
(requiring 30 days notice of termination by either party to the other) at a
monthly fixed rent equal to one and one-half times the Fixed Rent due hereunder
for the last month of the Term, and otherwise subject to all the covenants and
conditions (including obligations to pay additional charges under Section 2.6)
of this Lease as though it had originally been a monthly tenancy.
Notwithstanding the foregoing, if Landlord desire to regain possession of the
Premises promptly after the termination or expiration hereof and prior to
acceptance of rent for any period thereafter, Landlord may, at its option,
forthwith re-enter and take possession of the Premises or any part thereof or by
any legal process in force in The Commonwealth of Massachusetts.

     Notwithstanding the establishment of any holdover tenancy following the
expiration or earlier termination of the Term, if Tenant fails promptly to
vacate the Premises at the expiration or earlier termination of the Term, Tenant
shall save Landlord harmless and indemnified against any claim, loss, cost or
expense (including reasonable attorneys' fees) arising out of Tenant's failure
promptly to vacate the Premises (or any portion thereof).

     8.2  ESTOPPEL CERTIFICATES
          ---------------------

     At Landlord's request, from time to time, Tenant agrees to execute and
deliver to Landlord, within ten (10) days after such request, a certificate
which acknowledges the dates on which the Term begins and ends, tenancy and
possession of the Premises and recites such other facts concerning any provision
of the Lease or payments made under the Lease which Landlord or a mortgagee or
lender or a purchaser or prospective purchaser of the Building or any interest
therein or any other party may from time to time reasonably request.

                                      -24-
<PAGE>
 
     8.3  NOTICE
          ------

     Any notice, approval, consent and other like communication hereunder from
Landlord to Tenant or from Tenant to Landlord shall be effective only if given
in writing and shall be deemed duly served if and when hand delivered or if and
when mailed prepaid certified mail (in either case, whether or not accepted for
delivery).  Communications to Tenant shall be addressed to Tenant's Authorized
Representative at the Original Address of Tenant set forth in Section 1.1 prior
to the Term Commencement Date and thereafter at the Premises.  Communications to
Landlord shall be addressed to the Address of Landlord set forth in Section 1.1.
Either party may from time to time designate other addresses within the
continental United States by notice to the other.

     8.4  LANDLORD'S RIGHT TO CURE
          ------------------------

     At any time and without notice, Landlord may, but need not, cure any
failure by Tenant to perform its obligations under this Lease.  Whenever
Landlord chooses to do so, Tenant shall pay all costs and expenses incurred by
Landlord in curing any such failure, including, without limitation, reasonable
attorneys' fees and interest as provided in Section 7.6.

     8.5  SUCCESSORS AND ASSIGNS
          ----------------------

     This Lease and the covenants and conditions herein contained shall inure to
the benefit of and be binding upon Landlord, its successors and assigns, and
shall be binding upon Tenant, its successors and assigns, and shall inure to the
benefit of Tenant and only such Subtenants of Tenant as are permitted hereunder.
The term "Landlord" means the original Landlord named herein, its successors and
assigns.  The term "Tenant" means the original Tenant named herein and its
permitted successors and assigns.

     8.6  BROKERAGE
          ---------

     Tenant warrants that it has had no dealings with any broker or agent in
connection with this Lease or any other space in the Hobbs Brook Office Park
except for any broker designated in Section 1.1.  Tenant covenants to pay, hold
harmless and indemnify Landlord from and against any and all costs, expense, or
liability for any compensation, commissions and charges claimed by any broker or
agent other than any such broker designated in Section 1.1 with respect to this
Lease or the negotiation thereof arising from a breach of the foregoing
warranty.  Landlord shall be responsible for payment of any brokerage commission
to any broker designated in Section 1.1.

     8.7  WAIVER
          ------

     The failure of Landlord or of Tenant to seek redress for violation of, or
to insist upon strict performance of, any

                                      -25-
<PAGE>
 
covenant or condition of this Lease, or, with respect to such failure of
Landlord, any of the Rules and Regulations referred to in Section 5.3, whether
heretofore or hereafter adopted by Landlord, shall not be deemed a waiver of
such violation nor prevent a subsequent act, which would have originally
constituted a violation, from having all the effect of an original violation,
nor shall the failure of Landlord to enforce any of said Rules and Regulations
against any other tenant of the Building be deemed a waiver of any such Rules or
Regulations.  The receipt by Landlord of Fixed Rent or additional charges with
knowledge of the breach of any covenant of this Lease shall not be deemed 
waiver of such breach.  No provision of this Lease shall be deemed to have been
waived by Landlord, or by Tenant, unless such waiver be in writing signed by the
party to be charged.  No consent or waiver, express or implied, by Landlord or
Tenant to or of any breach of any agreement or duty shall be construed as a
waiver or consent to or of any other breach of the same or any other agreement
or duty.

     8.8  ACCORD AND SATISFACTION
          -----------------------

     No acceptance by Landlord of a lesser sum than the Fixed Rent and
additional charges then due shall be deemed to be other than on account of the
earliest installment of such rent and charges due, nor shall any endorsement or
statement on any check or any letter accompanying any check or payment as rent
be deemed an accord and satisfaction, and Landlord may accept such check or
payment without prejudice to Landlord's right to recover the balance of such
installment or pursue any other remedy provided in this Lease.  The delivery of
keys to Landlord shall not operate as a termination of this Lease or a surrender
of the Premises.

     8.9  REMEDIES CUMULATIVE
          -------------------

     The specific remedies to which Landlord may resort under the terms of this
Lease are cumulative and are not intended to be exclusive of any other remedies
to which it may be lawfully entitled in case of any breach or threatened breach
by Tenant of any provisions of this Lease.  In addition to the other remedies
provided in this Lease, Landlord shall be entitled to the restraint by
injunction of the violation or attempted or threatened violation of any of the
covenants or conditions of this Lease or to a decree compelling specific
performance of any such covenants or conditions.

     8.10 PARTIAL INVALIDITY
          ------------------

     If any term of this Lease, or the application thereof to any person or
circumstance, shall to any extent be invalid or unenforceable, the remainder of
this Lease, or the application of such term to persons or circumstances other
than those as to which it is invalid or unenforceable, shall not be affected
thereby, and each term of this Lease shall be valid and

                                      -26-
<PAGE>
 
enforceable to the fullest extent permitted by law.

     8.11 WAIVERS OF SUBROGATION
          ----------------------

     Any insurance carried by either party with respect to the Premises or
property therein or occurrences thereon shall, if it can be so written without
additional premium or with an additional premium which the other party agrees to
pay, include a clause or endorsement denying to the insurer rights of
subrogation against the other party to the extent rights have been waived by the
insured hereunder prior to occurrence of injury or loss.  Each party,
notwithstanding any provisions of this Lease to the contrary, hereby waives any
rights of recovery against the other for injury or loss due to hazards covered
by such insurance to the extent of the indemnification received thereunder.

     8.12 ENTIRE AGREEMENT
          ----------------

     This Lease contains all of the agreements between Landlord and Tenant with
respect to the Premises and supersedes all prior writings and dealings between
them with respect thereto.

     8.13 NO AGREEMENT UNTIL SIGNED
          -------------------------

     The submission of this Lease or a summary of some or all of its provisions
for examination does not constitute a reservation of or option for the Premises
or an offer to lease and no legal obligations shall arise with respect to the
Premises or other matters herein until this Lease is executed and delivered by
Landlord and Tenant.

     8.14 TENANT'S AUTHORIZED REPRESENTATIVE
          ----------------------------------

     Tenant designates the person named from time to time as Tenant's Authorized
Representative to take all acts of Tenant hereunder.  Landlord may rely on the
acts of such Authorized Representative without further inquiry or evidence of
authority.  Tenant's Authorized Representative shall be the person so designated
in Section 1.1 and such successors as may be named from time to time by the then
current Tenant's Authorized Representative or by Tenant's president.

     8.15 NOTICE OF LEASE
          ---------------

     Landlord and Tenant agree not to record this Lease.  Both parties will, at
the request of either, acknowledge and deliver a Notice of Lease and a Notice of
Termination of Lease Term, each in recordable form.  Such notices shall contain
only the information required by law for recording and a description of Tenant's
expansion and extension option.  Tenant hereby irrevocably appoints Landlord as
Tenant's attorney-in-fact (which appointment shall survive termination of the
Term) with full power of substitution to execute, acknowledge and deliver a

                                      -27-
<PAGE>
 
notice of termination of lease on Tenant's name if Tenant fails to do so within
10 days after request therefor.

     8.16 TENANT AS BUSINESS ENTITY
          -------------------------

     If Tenant is a business entity, then the person or persons executing this
Lease on behalf of Tenant jointly and severally warrant and represent in their
corporate capacities that (a) Tenant is duly organized, validly existing and in
good standing under the laws of the jurisdiction in which such entity was
organized; (b) Tenant has the authority to own its property and to carry on its
business as contemplated under this Lease; (c) Tenant is in compliance with all
laws and orders of public authorities applicable to Tenant; (d) Tenant has duly
executed and delivered this lease; (e) the execution, delivery and performance
by Tenant of this Lease (i) are within the powers of Tenant, (ii) have been duly
authorized by all requisite action, (iii) will not violate any provisions of law
or any order of any court or agency of government, or any agreement or other
instrument to which Tenant is a party or by which it or any of its property is
bound, and (iv) will not result in the imposition of any lien or charge on any
of Tenant's property, except by the provisions of this Lease; and (v) the Lease
is a valid and binding obligation of Tenant in accordance with its terms.
Tenant, if a business entity, agrees that breach of the foregoing warrant and
representation shall at Landlord's election be a default under this Lease for
which there shall be no cure.  This warranty and representation shall survive
the termination of the Term.

     8.17 RELOCATION
          ----------

     If the Premises contain 2,000 rentable square feet or less, Landlord
reserves the right to relocate the Premises to comparable space within the
Building by giving Tenant prior notice of such intention to relocate.  If within
one month after receipt of such notice Tenant has not agreed with Landlord on
the space to which the Premises are to be relocated, the timing of such
relocation and the terms of such relocation, then Landlord shall have the option
either to withdraw its relocation notice or to terminate this Lease on a date
which is at least 60 days after the date of the original notice (such date to
take effect as though the Lease had then expired).

     If Landlord and Tenant do so agree on relocation, then, effective on the
date of such relocation, this Lease shall be amended by deleting the description
of the original Premises and the Rentable Floor Area of Premises set forth in
Section 1.1 and substituting therefor information relating to such relocation
space.  Landlord agrees to pay the reasonable cost of moving Tenant to such
other space and finishing such space to a condition comparable to the then
condition of the Premises.

     8.18 MISCELLANEOUS PROVISIONS
          ------------------------

                                      -28-
<PAGE>
 
     This Lease may be executed in counterparts and shall constitute the
agreement of Landlord and Tenant whether or not their signatures appear in a
single copy hereof.  This Lease shall be construed as a sealed instrument and
shall be governed exclusively by the provisions hereof and by the laws of The
Commonwealth of Massachusetts as the same may from time to time exist.  The
titles are for convenience only and shall not be considered a part of the Lease.
Where the phrases "persons acting under Tenant" or "persons claiming under
Tenant" or similar phrases are used, the persons included shall be all
employees, agents, independent contractors and invitees of Tenant or of any
Subtenant of Tenant.  The enumeration of specific examples of or inclusions in a
general provision shall not be construed as a limitation of the general
provision.  If Tenant is granted any extension option, expansion option or other
right or option, the exercise of such right or option (and notice thereof) must
be unconditional to be effective, time always being of the essence to the
exercise of such right or option; and if Tenant purports to condition the
exercise of any option or to vary its terms in any manner, then the option
granted shall be void and the purported exercise shall be ineffective.  Unless
otherwise stated herein, any consent or approval required hereunder may be given
or withheld in the sole absolute discretion of the party whose consent or
approval is required.  Nothing herein shall be construed as creating the
relationship between Landlord and Tenant of principal and agent, or of partners
or joint venturers or any relationship other than landlord and tenant.  This
Lease and all consents, notices, approvals and all other documents relating
hereto may be reproduced by any party by photographic, microfilm, microfiche or
other reproduction process and the originals thereof may be destroyed; and each
party agrees that any reproductions shall be admissible in evidence as the
original itself in any judicial or administrative proceeding (whether or not the
original is in existence and whether or not reproduction was made in the regular
course of business) and that any further reproduction of such reproduction shall
likewise be admissible in evidence.  This Lease may be amended only by a writing
signed by all of the parties hereto.

                                  ARTICLE IX

               LANDLORD'S LIABILITY AND ASSIGNMENT FOR FINANCING

     9.1  LANDLORD'S LIABILITY
          --------------------

     Tenant agrees from time to time to look only to Landlord's interest in the
Land and Building for satisfaction of any claim against Landlord hereunder or
under any other instrument related to the Lease (including any separate
agreements among the parties and any notices or certificates delivered by
Landlord) and not to any other property or assets of Landlord.  If Landlord from
time to time transfers its interest in the Land and Building (or part thereof
which includes the Premises), then from and after each such transfer Tenant
shall look solely to the interests in the

                                      -29-
<PAGE>
 
Land and Building of each of Landlord's transferees for the performance of all
of the obligations of Landlord hereunder (or under any related instrument).  The
obligations of Landlord shall not be binding on any partners (or trustees or
beneficiaries) of Landlord or of any successor, individually, but only upon
Landlord's or such successor's interest described above.

     In no event shall Landlord ever be liable for any indirect or consequential
damages.

     9.2  ASSIGNMENT OF RENTS
          -------------------

     If, at any time and from time to time, Landlord assigns this Lease or the
rents payable hereunder to the holder of any mortgage on the Building, or to any
other party for the purpose of securing financing (the holder of any such
mortgage and any other such financing party are referred to herein as the
"Financing Party"), whether such assignment is conditional in nature or
otherwise, the following provisions shall apply:

          (i)    Such assignment to the Financing Party shall not be deemed an
assumption by the Financing Party of any obligations of Landlord hereunder
unless such Financing Party shall, by written notice to Tenant, specifically
otherwise elect;

          (ii)   Except as provided in (i) above and (iii) below, the Financing
Party shall be treated as having assumed Landlord's obligations hereunder
(subject to Section 9.1) only upon foreclosure of its mortgage (or voluntary
conveyance by deed in lieu thereof) and the taking of possession of the Premises
from and after foreclosure and, with respect to obligations regarding return of
the security deposit, only upon receipt of the funds constituting such security
deposit;

          (iii)  Subject to Section 9.1, the Financing Party shall be
responsible for only such breaches under the Lease by Landlord which occur
during the period of ownership by the Financing Party after such foreclosure (or
voluntary conveyance by deed in lieu thereof) and taking of possession, as
aforesaid;

          (iv)   In the event Tenant alleges that Landlord is in default under
any of Landlord's obligations under this Lease, Tenant agrees to give the holder
of any mortgage, by registered mail, a copy of any notice of default which is
served upon the Landlord, provided that prior to such notice, Tenant has been
notified, in writing, (whether by way of notice of an assignment of lease,
request to execute an estoppel letter, or otherwise) of the address of any such
holder.  Tenant further agrees that if Landlord shall have failed to cure such
default within the time provided by law or such additional time as may be
provided in such notice to Landlord, such holder shall have sixty (60) days
after the last date on which Landlord could have cured such default within which
such holder will be permitted to cure such default.  If such default cannot be
cured within such sixty-day

                                      -30-
<PAGE>
 
period, then such holder shall have such additional time as may be necessary to
cure such default, if within such sixty day period such holder has commenced and
is diligently pursuing the remedies necessary to effect such cure (including,
but not limited to, commencement of foreclosure proceedings, if necessary, to
effect such cure), in which event Tenant shall have no right with respect to
such default while such remedies are being diligently pursued by such holder.

     In all events, any liability of a Financing Party shall be limited to the
interest of such Financing Party in the Land and Building, and in no event shall
a Financing Party ever be liable for any indirect or consequential damages.

     Tenant hereby agrees to enter into such agreements or instruments as may,
from time to time, be requested in confirmation of the foregoing.

                                   ARTICLE X

                       SUBORDINATION AND NON-DISTURBANCE

     This Lease shall be subject and subordinate to any mortgages that may now
or hereafter be placed upon the Building and/or the Land and to any and all
advances to be made under such mortgages and to the interest thereon, and all
renewals, extensions and consolidations thereof.  Any mortgagee may elect to
give this Lease priority to its mortgage, except that the Lease shall not have
priority to (i) the prior rights to insurance proceeds and the disposition
thereof under the mortgage; (ii) the prior rights to condemnation awards and the
disposition thereof under the mortgage; and (iii) intervening liens.  In the
event of such election and upon notification by such mortgagee, this Lease shall
be deemed prior in lien to the said mortgage.  This Section shall be self-
operative, but in confirmation thereof, Tenant shall execute and deliver
whatever instruments may be required by the mortgagee (or mortgagees) to
acknowledge such subordination or priority in recordable form, and if Tenant
fails to do so within ten (10) days after demand, Tenant hereby irrevocably
appoints Landlord as Tenant's attorney-in-fact, in its name, place and stead to
do so.

                                  ARTICLE XI

                                    PARKING

     11.1 GENERAL
          -------

     Landlord agrees to provide free of charge an automobile parking area during
the term of this Lease for the benefit and use of the customers and employees of
Tenant, and other tenants and occupants of the Building.  Wherever the words
"automobile parking area" are used in this Lease, it is intended that the same
shall include, whether in a surface parking area or a

                                      -31-
<PAGE>
 
parking structure, the automobile parking stalls, driveways, entrances, exits,
sidewalks, landscaped areas, pedestrian passageways in conjunction therewith and
other areas designated for parking.  Landlord shall keep the automobile parking
area neat, clean and in good repair, properly lighted and landscaped.  Nothing
contained herein shall be deemed to create liability upon Landlord for any
damage to motor vehicles of customers or employees or from loss of property from
within such motor vehicles, unless caused by the negligence of Landlord, its
agents, servants and employees.  Landlord shall have the right to establish and
enforce against all users of the automobile parking area, such reasonable rules
and regulations as may be deemed necessary and advisable for the proper and
efficient operation and maintenance of the automobile parking area, including
the hours during which the automobile parking area shall be open for use.

     Landlord may establish for the automobile parking area, a system or systems
of charged validation or other operation including, but not limited to, a system
of charges against nonvalidated parking checks of users.  Tenant shall comply
with such system, and all rules and regulations established by Landlord in
conjunction with such system, and shall cause its customers and employees to
comply therewith; provided, however, that such system and such rules and
regulations shall apply equally and without discrimination to all persons
entitled to the use of the automobile parking area.

     Landlord shall at all times during the term hereof have the sole and
exclusive control of the automobile parking area, and may at any time during the
term hereof exclude and restrain any person from use thereof; excepting,
however, Tenant and its employees, bona fide customers, patrons and service
suppliers of Tenant and other tenants of Landlord who make use of said area in
accordance with any rules and regulations established by Landlord from time to
time with respect thereto.  Landlord shall also have the right to designate
certain automobile parking areas as being for the exclusive use of one or more
of the Tenants of Landlord.  The rights of Tenant referred to in this Article
shall at all times be subject to the rights of Landlord and the other tenants of
Landlord to use the same in common with Tenant, and it shall be the duty of
Tenant to keep all of said area free of any obstructions created or permitted by
Tenant or resulting from Tenant's operations and to permit the use of any of
said area only for normal parking and ingress and egress by said customers,
patrons and service suppliers to and from the Building.

     Landlord shall at all times have the right and privilege of determining the
nature and extent of the automobile parking area, whether the same shall be
surface, underground or other structure, and of making such changes therein from
time to time which in its opinion are deemed to be desirable and for the best
interests of all persons using the automobile parking area.  Landlord agrees
that it will not reduce the size of the

                                      -32-
<PAGE>
 
automobile parking area during the Lease Term.

     11.2 EMPLOYEE PARKING
          ----------------

     It is understood and agreed that the employees of Tenant and the other
tenants of Landlord within the Building shall not be permitted to park their
automobiles in the portions of the automobile parking area which may from time
to time be designated for patrons of the Building and that Landlord shall at all
times have the right to establish rules and regulations for employee parking.

     11.3 PATRON PARKING
          --------------

     Landlord agrees to provide within the automobile parking area parking
spaces for the patrons of Tenant and other tenants in the Building in sufficient
number as from time to time Landlord shall deem appropriate.

     11.4 OTHER PARKING USERS
          -------------------

     Landlord may authorize persons other than those described above, including
occupants of other buildings, to utilize said automobile parking area, provided
that such use does not interfere with Tenant's needs.

     Executed to take effect as a sealed instrument.

                              Middlesex Mutual Building Trust
                              Landlord


                              By:/s/ [Agent for the Trustees]
                                 -------------------------------
                                 Agent for the Trustees


                              Credit Technologies, Inc.
                              Tenant


                              By:/s/ Pamela D. A. Reeve
                                 -------------------------------

                                      -33-
<PAGE>
 


                                   Exhibit A
                               Third Floor Plan
                               235 Wyman Street
<PAGE>
 
TENANT STANDARD BUILD OUT

404 WYMAN STREET



Tenant Entries shall consist of 3'-0" x 7'-10" solid core oak veneer door in
- --------------                                                              
solid oak frame with tempered glass sidelight 2'-6" x 7'-10".  For tenants
greater than 20,000 SF, Tenant Entries shall consist of one pair of 3'-0" x 7'-
10" solid core oak veneer doors in solid oak frames without sidelights.
Hardware shall consist of mortise lever lockset, 2 pair butts, closer,
silencers, floor stop, all satin stainless steel finish.

Tenant Interior Doors shall be 3'-0" x 7'-10" solid core oak veneer.  Door
- ---------------------                                                     
frames shall be hollow metal frames.  Hardware shall consist of 1-1/2 pair
butts, mortise lever handle hardware of which 20% locksets, 80% latchsets,
silencers and floor stop.  Provide one door and frame and hardware set per 25
linear feet of interior partitions.

Tenant Interior Partitions (ceiling high) shall extend from floor slab to 6"
- -----------------------------------------                                   
above the ceiling, shall be braced to the structural slab above, and shall be
constructed of 2 1/2 inch metal studs with one layer of 1/2 inch gypsum
wallboard on each side.  All partitions shall have 4 inch high resilient vinyl
base on each side.  Provide one linear foot of interior partition per 14 SF of
usable area.

Tenant Interior Partitions/Demising Walls (floor to structural deck above) shall
- --------------------------------------------------------------------------      
be constructed of 2 1/2 inch metal studs with two layers of 1/2 inch gypsum
wallboard on one side, and one layer of 1/2 inch gypsum wallboard on the other
side.  All partitions shall have 4 inch high resilient vinyl base on each side.
The vinyl base shall be selected from standard range of colors in the current
Johnsonite catalog.  Provide one linear foot of interior partition per 100 SF
usable area.

Suspended Acoustical Ceilings shall be "Celotex Celotone Mineral Fiber Natural
- -----------------------------                                                 
Fissured Series Number MF-454, Product Code 42539", 24" x 24" x 3/4", with
reveal edges, and white factory finish classified by U.L. Inc. for flame spread
rating of 0-25 and labeled Class 25, Non-combustible, Fed. Spec. SS-S-118b,
tested ASTM 84, 0.60.070 NRC.  Panels shall be coded to clearly indicate
direction of "mill-run".  Suspension System shall be exposed grid "T" suspension
system and suspension members shall be finished white.  Ceiling height shall be
8'-6".

Painting:  All interior partitions shall receive two coats of semi-gloss latex
- --------                                                                      
paint.  All doors and frames shall receive two coats of polyurethane.

Carpet for all Tenant Areas:  Carpet shall be Lees "Best Regards II" installed
- ---------------------------                                                   
direct glue-down.  Carpet shall be selected from

                                      -35-
<PAGE>
 
standard range of colors in the current catalog.  Provide resilient base at both
sides of interior partitions.

Lighting:  Provide one 2' x 4' parabolic fixture completely installed and
- --------                                                                 
connected for each 100 SF of tenant area.

Single Pole Light Switches:  Provide one for each 350 SF of tenant area.  Cover
- --------------------------                                                     
plates shall be stainless steel, No. 4 finish.  Switches shall be white.

Duplex Wall Receptacles:  Provide one duplex wall receptacle for each 125 SF of
- -----------------------                                                        
tenant area.  Cover plates shall be stainless steel, No. 4 finish.  Receptacles
shall be white.

Emergency Exit Lighting and Exit Signs:  Provide exit lighting in tenant areas
- --------------------------------------                                         
as directed by Architect.

Fire Alarm Equipment:  Provide corridor smoke detectors and fire alarm speaker-
- --------------------                                                          
lights as directed by architect.

Sprinklers:  Provide complete sprinkling of tenant areas in conformance with
- ----------                                                                  
code requirements, based on ordinary hazard occupancy.

Sprinkler Heads:  Fully concealed, white cover plate.  Provide one head per 160
- ---------------                                                                
SF of tenant area.  Piping is sized to accommodate one head per 110 SF.
Centering of heads in the ceiling tile shall be an additional expense.

                                      -36-
<PAGE>
 
               HOBBS BROOK OFFICE PARK - CLEANING SPECIFICATIONS
               -------------------------------------------------


DAILY:
- ----- 

1.   Sweep, dry mop, or vacuum all floor areas of resilient wood or carpet,
     remove any gum and tar matter which has adhered to the floor.

2.   Clean all stairwells and stairs as required by type.

3.   Damp mop all non-resilient floors such as concrete, terrazzo and ceramic
     tile.

4.   Vacuum and spot clean all carpet areas.

5.   Empty and damp wipe all ashtrays and waste baskets and remove all trash.
     Replace plastic liners as needed.

6.   All glass entrance doors and interior glass doors and hardware are to be
     cleaned on both sides.

7.   Dust all horizontal surfaces with treated dust cloth or feather duster,
     including furniture, files, equipment, blinds, oak trim, convector covers
     and louvers that can be reached without a ladder.

8.   Brush all fabric covered chairs with a lint brush as needed.

9.   Damp wipe all telephones, including dials and crevices as needed.

10.  Spot wash to remove smudges, marks and fingerprints from such areas as
     walls, equipment, doors, partitions and light switches within reach.

11.  Wash water fountains, chalkboards, cafeteria tables and chairs.

12.  Clean and vacuum freight and passenger elevator cabs and landing doors
     including elevator door tracts.

RESTROOMS:
- --------- 

13.  Refill all soap, toilet, sanitary napkin and towel dispensers.  Replace
     plastic liners and waxed bags in sanitary disposal units.

14.  Damp mop floors and wash baseboards using detergent disinfectant.

15.  Clean mirrors, soap dispensers, shelves, wash basins, exposed plumbing,
     dispenser and disposal container exteriors using detergent disinfectant and
     water.  Damp wipe all

                                      -1-
<PAGE>
 
     ledges, toilet stalls and doors.  Spot clean light switches, doors and
     walls.

16.  Clean toilets and urinals with detergent disinfectant, beginning with seats
     and working down.  Pour one ounce of bowl cleaner into urinal after
     cleaning and do not flush.
                  ------------ 

WEEKLY:
- ------ 

1.   Spot clean carpet stains.

2.   Wash glass in display windows, building directory, entrance doors and
     frames and show windows, both sides.

3.   Spot wash interior partition glass and door glass to remove smudge marks.


MONTHLY:
- ------- 

1.   Scrub and recondition resilient floor areas using buffable non-slip type
     floor finish (product to be approved by building management).

2.   Dust all ceiling and wall air supply and exhaust diffusers or grills.

3.   Wash all interior glass, both sides.

QUARTERLY:
- --------- 

1.   High dust all horizontal and vertical surfaces not reached in nightly
     cleaning such as:  pipes, light fixtures, door frames, picture frames and
     other wall hangings.

2.   Vacuum/dust all open book shelves.

3.   Wash and polish vertical terrazzo or marble surfaces.

4.   Damp wash diffusers, vents, grills and other such items, including
     surrounding wall or ceiling areas that are soiled.

SEMI-ANNUALLY:
- ------------- 

1.   Vacuum drapes, blinds, cornices and wall hangings.

2.   Dust all storage areas, including shelves and contents such as:  supply and
     stock closets and damp mop floor areas.

3.   Strip and refinish all resilient floor areas using buffable non-slip floor
     finish (product will be approved by building management).

                                      -2-
<PAGE>
 
ANNUALLY:
- -------- 

1.   Wash light fixtures, including reflectors, globes, diffusers and trim.

2.   Wash walls in corridors, lounges, classrooms, demonstration areas,
     cafeterias and washrooms.

3.   Clean all vertical surfaces not attended to in nightly, weekly, quarterly
     or semi-annual cleaning.

                                      -3-

<PAGE>
 
                                                                   Exhibit 10.11
 
                              Employment Agreement
                              --------------------


     This Employment Agreement made as of the 16th day of August, 1996 by and
between Lightbridge, Inc., a Delaware corporation (the "Company"), and Pamela
D.A. Reeve of Winchester, Massachusetts (the "Employee").

     WHEREAS, the Employee currently serves as the President and Chief Executive
Officer of the Company; and

     WHEREAS, the Company and the Employee desire to establish certain terms and
conditions governing the Employee's employment by the Company;

     NOW, THEREFORE, in consideration of the premises and the mutual promises
hereinafter set forth, the Company and the Employee agree as follows:

     1.  Employment.  The Company hereby employs the Employee, and the Employee
         ----------                                                            
accepts employment with the Company.  The Employee's title and duties at the
start of this agreement shall be those of President and Chief Executive Officer
of the Company.  As such, the Employee shall report directly to the Company's
Board of Directors.

     2.  Term of Employment.  There shall be no definite term of employment, and
         ------------------                                                     
Employee shall be an employee at will.  However, if Employee's employment
hereunder terminates for any reason, other than death or disability, within one
year after a change of control of the Company or if the Company terminates the
Employee's employment hereunder at any time without cause, the Company shall
make Severance Payments to Employee equal to one year of Base Salary, payable
over twelve (12) months.  "Cause" shall mean dishonesty or misappropriation of
assets of the Company, gross failure to perform duties to the Company, or the
commission of a crime involving moral turpitude or constituting a felony.
"Change of control" shall include a merger or sale of stock in which the
stockholders of the Company immediately before the merger own fifty percent
(50%) or less of the voting securities of the surviving corporation immediately
after the merger.

     3.  Compensation.
         ------------ 

     (a)  During the term of this Agreement, the Company shall pay the Employee
a Base Salary, payable in accordance with the Company's standard schedule for
salary payments to its executives (but no less frequently than monthly) in
arrears, in equal installments at an annual rate equal to $165,000.  At the
beginning of each fiscal year, the Board of Directors shall consider in its
discretion increases in the base salary.

     (b)  The Board of Directors shall determine on an annual basis the amount
of any bonus to be paid to the Employee.
<PAGE>
 
     (c)  All payments of salary and incentive compensation to the Employee
shall be made after deduction of any taxes which are required to be withheld
with respect thereto under applicable federal and state laws.

     4.  Office and Fringe Benefits.  The Employee shall be provided with an
         --------------------------                                         
office, secretary and other facilities and services commensurate with her
position as a senior executive of the Company.  The Company shall continue to
provide the Employee with an automobile in accordance with its current practice.

     5.  Expenses.  The Company shall reimburse the Employee for all reasonable
         --------                                                              
business expenses incurred by the Employee in connection with her employment by
the Company, including, without limitation, expenses of travel and
entertainment.  The Company shall promptly reimburse the Employee for all such
expenses upon presentation of appropriate vouchers, receipts and other
supporting documents as reasonably required by the Company.

     6.  Duty to Perform Services.  The Employee shall devote her full time
         ------------------------                                          
during normal business hours to rendering services to the Company hereunder, and
shall exert all reasonable efforts in the rendering of such services.  Nothing
in this Agreement shall prohibit the Employee from:

          (a) making and managing passive investments;

          (b) serving on the Board of Directors of any company;

          (c) participating in professional organizations; and

          (d) engaging in religious, charitable or other community or nonprofit
              activities, provided none of the foregoing shall interfere with
              Employee's duties hereunder.

     The Employee agrees that in the rendering of all services to the Company
and in all aspects of her employment as a senior level executive of the Company,
she will comply in all material respects with all directives, policies,
standards and regulations from time to time established by the Board of
Directors of the Company to the extent they are not in conflict with this
Agreement.

     7.   Vacations; Holidays; Sick Time.  The Employee shall be entitled to
          ------------------------------                                    
vacation time, holiday time and sick leave in accordance with the Company's
policies for senior executive officers, as in effect from time to time.

     8.   Other Agreements.  Nothing in this Agreement shall supersede or modify
          ----------------                                                      
Employee's obligations under any existing non-competition or non-disclosure
agreement with the Company.

                                      -2-
<PAGE>
 
     9.   Notices.  All notices, requests, demands and other communications
          -------                                                          
required by or permitted under this Agreement shall be in writing and shall be
sufficiently delivered if delivered by hand or sent by registered or certified
mail, postage prepaid, to the parties at their respective addresses listed
below:

          (a)  if to the Employee:

                 Pamela D.A. Reeve
                 3 Black Horse Terrace
                 Winchester, MA 01890

          (b)  if to the Company:

                 Lightbridge, Inc.
                 281 Winter Street
                 Waltham, MA 02154
                 Attn:  Chief Financial Officer

Any party may change such party's address by such notice to the other party.

     10.  Governing Law.  This Agreement shall be governed by, and construed and
          -------------                                                         
enforced in accordance with, the laws of The Commonwealth of Massachusetts.

     11.  Binding Upon Successors.  This Agreement shall be binding upon, and
          -----------------------                                            
shall inure to the benefit of, the parties hereto and their respective heirs,
legal representatives, successors and assigns.

     12.  Waivers and Amendments.
          ---------------------- 

          (a)  This Agreement may be amended, modified or supplemented, and any
obligation hereunder may be waived, only by a written instrument executed by the
parties hereto.  The waiver by any party hereto of a breach of any provision of
this Agreement shall not operate as a waiver of any subsequent breach.

          (b)  No failure on the part of any party to exercise, and no delay in
exercising, any right or remedy hereunder shall operate as a waiver thereof, nor
shall any single or partial exercise of any such right or remedy by such party
preclude any other or further exercise thereof or the exercise of any other
right or remedy.  All rights and remedies hereunder are cumulative and are in
addition to all other rights and remedies provided by law, agreement or
otherwise.

     13.  Term of Agreement.  This Agreement shall terminate on December 31,
          -----------------                                                 
1998; provided, that this Agreement shall be automatically renewed for
successive one-year periods unless either party gives sixty (60) days' prior
written notice to the other party to terminate this Agreement on December 31 of
such year.

                                      -3-
<PAGE>
 
     IN WITNESS WHEREOF, the Company and the Employee have executed this
Agreement on the date first above written.

                                    LIGHTBRIDGE, INC.

                                    By: /s/ William G. Brown
                                        -------------------------------
                                      Its CFO/VP Finance



                                    /s/ Pamela D.A. Reeve
                                    ------------------------------------
                                         Pamela D.A. Reeve

                                      -4-

<PAGE>
 
                                                                   Exhibit 10.12

                    DATE OF LEASE EXECUTION:  August 5, 1994

                         (To be completed by Landlord)


                                   ARTICLE I

                                 REFERENCE DATA


1.1  SUBJECTS REFERRED TO:

     Each reference in this lease to any of the following

subjects shall be construed to incorporate the data stated for

that subject in this Section 1.1:

LANDLORD:               L&E Investment of Massachusetts One, Inc., a Delaware
                        corporation

MANAGING AGENT:         R.M. Bradley & Co., Inc.

LANDLORD'S &            Somerset Court
MANAGING AGENT'S        281 Winter Street
ADDRESS:                Waltham, Massachusetts  02154
                        Attention:  Carol MacLeod

TENANT:                 Credit Technologies Inc., a Delaware corporation

TENANT'S ADDRESS  
(FOR NOTICE AND         281 Winter Street
BILLING):               Waltham, Massachusetts  02154
                        Attention:  Accounts Payable

BUILDING ADDRESS:       281 Winter Street
                        Waltham, Massachusetts  02154

TENANT'S SPACE:         Portion of the second floor as shown on Exhibit A
                        attached hereto

RENTABLE FLOOR AREA 
OF TENANT'S SPACE:      12,046 square feet

TENANT'S                17.77% (12,046) square feet divided by
PROPORTIONATE SHARE:    67,800 square feet)

TOTAL RENTABLE FLOOR 
AREA OF THE 
BUILDING:               67,800 square feet

<PAGE>
 
PARKING SPACES 
ALLOCATED TO TENANT:    Approximately 48 parking spaces (calculated at 4.0
                        unassigned parking spaces per 1,000 square feet)

COMMENCEMENT DATE:      December 1, 1994 or the substantial completion of the
                        Leasehold Improvements

TERM EXPIRATION DATE:   The last day of the month in which the seventh
                        anniversary of the Commencement Date occurs

APPROXIMATE TERM:       Seven (7) years

BASE OPERATING COSTS:   Landlord's Operating Costs for the year ending December
                        31, 1995

BASE TAX COSTS:         Landlord's Real estate taxes for Tax Year 1995

ANNUAL RENT:            $21.50 per rentable square foot/year, plus $0.75 per
                        rentable square foot for electricity charges for all of
                        Tenant's Space except for any area separately metered
                        and paid for by Tenant

FIRST FISCAL YEAR 
FOR TENANT'S PAYING 
OPERATING COST 
ESCALATION:             Year ending December 31, 1996

FIRST YEAR FOR 
TENANT'S PAYING TAX 
ESCALATION:             Tax Year 1996

PERMITTED USES:         General office use

PUBLIC LIABILITY 
INSURANCE:



BODILY INJURY:          $2,000,000.00 per person/$2,000,000.00 per accident


PROPERTY DAMAGE:        $1,000,000.00

SPECIAL  PROVISIONS:


FISCAL YEAR:            January 1 through December 31

                                      -2-
<PAGE>
 
TAX YEAR:               July 1, through June 30 (as the same may be modified
                        from time to time by the appropriate municipality or
                        state); Tax Year 1995 is the Tax Year beginning July 1,
                        1994 and all other Tax Years shall be similarly
                        determined.


1.2  EXHIBITS.

     The exhibits listed below in this Section 1.2 are incorporated in this
Lease by reference and are to be construed as part of this Lease:

     EXHIBIT A    Plan showing Tenant's Space on second floor.

     EXHIBIT B    Specifications of Leasehold Improvements.

     EXHIBIT C    Building Standards.

     EXHIBIT D    Landlord's Services.

     EXHIBIT E    Rules and Regulations.
<TABLE>
<CAPTION>
 
 
1.3  TABLE OF CONTENTS.
                                                                         Page
                                                                         ----
<S>                                                                      <C> 
ARTICLE II - PREMISES AND TERM..........................................
 
     Section   2.1  Premises............................................
     Section   2.2  Term................................................
     Section   2.3  Extended Terms......................................
     Section   2.4  Intentionally Omitted...............................
     Section   2.5  Intentionally Omitted...............................
 
ARTICLE III - CONSTRUCTION..............................................
 
     Section   3.1  Acceptance of the Premises..........................
     Section   3.2  General Provisions Applicable to 
                    Construction........................................
     Section   3.3  Representatives.....................................
 
ARTICLE IV - RENT.......................................................
 
     Section   4.1  Rent................................................
     Section   4.2  Operating Costs; Taxes; Escalation..................
     Section   4.3  Estimated Escalation Payments.......................
     Section   4.4  Change of Fiscal Year...............................
     Section   4.5  Payments............................................

</TABLE> 

                                      -3-
<PAGE>
 
ARTICLE V - LANDLORD'S COVENANTS.......................................

     Section   5.1    Landlord's Covenants During the Term.............
     Section   5.1.1  Building Services................................
     Section   5.1.2  Additional Building Services.....................
     Section   5.1.3  Repairs
     Section   5.1.4  Quiet Enjoyment
     Section   5.2    Interruptions.

ARTICLE VI - TENANT'S COVENANTS.......................................

     Section 6.1  TENANT'S COVENANTS DURING THE TERM..................
          Section 6.1.1  Tenant's Payments............................
          Section 6.1.2  Repairs and Yielding Up......................
          Section 6.1.3  Occupancy and Use............................
          Section 6.1.4  Rules and Regulations........................
          Section 6.1.5  Safety Appliances............................
          Section 6.1.6  Assignment and Subletting....................
          Section 6.1.7  Indemnity....................................
          Section 6.1.8  Tenant's Liability Insurance.................
          Section 6.1.9  Tenant's Worker's Compensation  
                         Insurance....................................
          Section 6.1.10 Landlord's Right of Entry....................
          Section 6.1.11 Loading......................................
          Section 6.1.12 Landlord's Costs.............................
          Section 6.1.13 Tenant's Property............................
          Section 6.1.14 Labor or Materialmen's Liens.................
          Section 6.1.15 Changes or Additions.........................
          Section 6.1.16 Holdover.....................................
          Section 6.1.17 Right of Financial Review....................

ARTICLE VII - CASUALTY AND TAKING.....................................

     Section 7.1  Casualty and Taking.................................
     Section 7.2  Reservation of Award................................

ARTICLE VIII - RIGHTS OF MORTGAGEE....................................
     Section 8.1  Priority of Lease...................................
     Section 8.2  Rights of Mortgage Holders; Limitation 
                  of Mortgagee's Liability............................
     Section 8.3  Mortgagee's Election................................
     Section 8.4  No Prepayment or Modification, etc..................
     Section 8.5  No Release or Termination...........................
     Section 8.6  Continuing Offer....................................
     Section 8.7  Mortgagee's Approval................................
 
ARTICLE IX - DEFAULT..................................................
 
     Section 9.1  Events of Default...................................
     Section 9.2  Tenant's Obligations after Termination..............

                                      -4-
<PAGE>
 
ARTICLE X - MISCELLANEOUS.............................................
 
     Section 10.1  Notice of Lease....................................
     Section 10.2  Intentionally Omitted..............................
     Section 10.3  Notices from One Party to the Other................
     Section 10.4  Bind and Inure.....................................
     Section 10.5  No Surrender.......................................
     Section 10.6  No Waiver, Etc.....................................
     Section 10.7  No Accord and Satisfaction.........................
     Section 10.8  Cumulative Remedies................................
     Section 10.9  Landlord's Right to Cure...........................
     Section 10.10 Estoppel Certificate...............................
     Section 10.11 Waiver of Subrogation..............................
     Section 10.12 Acts of God........................................
     Section 10.13 Brokerage..........................................
     Section 10.14 Submission Not an Offer............................
     Section 10.15 Applicable Law and Construction....................

                                      -5-
<PAGE>
 
                                   ARTICLE II

                               PREMISES AND TERM

2.1  PREMISES.

     Subject to and with the benefit of the provisions of this Lease and any
ground lease or land disposition agreement relating to the parcel on which the
Building is located (the "Lot"), Landlord hereby leases to Tenant, and Tenant
leases from Landlord, Tenant's Space in the Building, excluding exterior faces
of exterior walls, the common facilities area and building service fixtures and
equipment serving exclusively or in common other parts of the Building.
Tenant's Space, with such exclusions, is hereinafter referred to as the
"Premises".

     Tenant shall have, as appurtenant to the Premises, the right to use in
common with others entitled thereto: (a) the common facilities included in the
Building or on the Lot, including the parking facility, if any, to the extent
and in the location from time to time designated by Landlord as set forth in
Section 1.1 and (b) the building service fixtures and equipment serving the
Premises.

     Landlord reserves the right from time to time, without unreasonable
interference with Tenant's use, (a) to install, repair, replace, use, maintain
and relocate for service to the Premises and to other parts of the Building or
either, building service fixtures and equipment wherever located in the Building
and (b) to alter or relocate any other common facilities, it being understood
that if any parking facilities are provided, the same may be relocated on or off
the Lot from time to time by Landlord, provided that in all events substitutions
are substantially equivalent.

2.2  TERM.

     To have and to hold for a period (the "Term") commencing on the
Commencement Date and continuing until the Term Expiration Date, unless sooner
terminated as provided in Section 6.1.6, 7.1, or in ARTICLE IX.  Landlord and
Tenant agree to confirm, in writing, the exact Commencement Date upon request of
either party and agree that "substantial completion of Leasehold Improvements to
be undertaken by Landlord on the portion of Tenant's Space located on the second
floor of the Building" shall mean the first to occur of (i) Tenant's occupancy
of said space or (ii) the substantial completion of the Leasehold Improvements
for said space (which may be conclusively determined by a certificate of
completion by a licensed architect or registered engineer).

                                      -6-
<PAGE>
 
2.3  EXTENDED TERMS.

     Tenant shall have the right and option to extend the Term for one (1)
period of two (2) years, such option to be exercisable by notice given to
Landlord not less than nine months prior to the expiration of the initial term.
If any such option is so exercised, all of the terms, covenants, conditions and
provisions of this Lease shall apply during the Term as extended except that
during the two year period, the Annual Rent shall be the higher of (a) $22.50
per rentable square foot per year or (b) the fair market rental value of the
Premises.  In the event that Tenant exercises its extension option hereunder,
Landlord shall, pursuant to written notice to Tenant within thirty (30) days
following receipt of the applicable Tenant's extension notice, propose the fair
market rental value of the Premises (the "Landlord's Proposed Fair Market
Rent").  The Landlord's Proposed Fair Market Rent shall constitute the fair
market rental value of the Premises for purposes of this Section 2.3 unless
Tenant notifies Landlord within twenty (20) days of Tenant's receipt of
Landlord's Proposed Fair Market Rent proposal that such Landlord's Proposed Fair
Market Rent is not satisfactory to Tenant and specifies in such notice the name
and address of an appraiser designated by Tenant in accordance with sub-
paragraph (b) below (the "Tenant's Appraisal Notice") in which event the fair
market rental value of the Premises shall be determined by the following
procedure:

     (a) Landlord shall, within ten (10) days after receipt of Tenant's
Appraisal Notice, notify Tenant of the name and address of an appraiser
designated by Landlord.  Such two appraisers shall, within thirty (30) days
after the designation of the second appraiser, make their determinations of the
fair market rental value of the Premises in writing and give notice thereof to
each other and to Landlord and Tenant.  Such two (2) appraisers shall have
fifteen (15) days after the receipt of notice of each other's determinations to
confer with each other and to attempt to reach agreement as to the determination
of the fair market rental value of the Premises.  If such appraisers shall
concur in such determination, they shall give notice thereof to Landlord and
Tenant and such concurrence shall be final and binding upon Landlord and Tenant.
If such appraisers shall fail to concur as to such determination within said
fifteen (15) day period, they shall immediately designate a third appraiser and
shall submit in writing to such third appraiser their respective determinations
of the fair market rental value of the Premises.  If the two appraisers shall
fail to agree upon the designation of such third appraiser within ten (10) days
after said fifteen (15) day period, then they or either of them shall give
notice of such failure to agree to Landlord and Tenant and, if Landlord and
Tenant fail to agree upon the selection of such third appraiser within ten (10)
days after the appraisers) 

                                      -7-
<PAGE>
 
appointed by the parties give notice as aforesaid, then either party on behalf
of both may apply to the president of the local chapter of the American
Institute of Real Estate Appraisers (provided he or she is not an officer or
employee of an entity actively engaged as an agent working on behalf of Landlord
or Tenant) or on its failure, refusal or inability to act within 10 days of the
application to that person to act, to a court of competent jurisdiction, for the
designation of such third appraiser.

     (b) All individuals who shall be designated or selected as appraisers
hereunder shall be real estate professionals who shall have had at least ten
(10) years continuous experience in the business of leasing similar space in the
greater Boston area.

     (c) The third appraiser shall conduct such hearings and investigations as
he or she may deem appropriate and shall, within thirty (30) days after the date
of his or her designation, select either the determination of Landlord's
appraiser or that of Tenant's appraiser, whichever he or she deems more
reasonable given his or her independent determination of the fair market rental
value of the Premises.

     (d) The determination of the appraisers, as provided above, shall be
conclusive upon the parties and shall have the same force and effect as a
judgment made in a court of competent jurisdiction and either party shall be
entitled to have a judgment entered thereon in any court of competent
jurisdiction.  Landlord shall pay the fees and expenses of the appraiser chosen
by Landlord, Tenant shall pay the fees and expenses of the appraiser chosen by
Tenant, and the fees and expenses of the third appraiser shall be paid in equal
proportions by Landlord and Tenant.

     (e) If for any reason the fair market rental value shall not have been
determined prior to the commencement of any additional two year period, Tenant
shall pay Annual Rent hereunder at the Annual Rent proposed by Landlord's
appraiser, or the Annual Rent during the next preceding period, whichever is
greater, until the fair market rental value has been determined.  The parties
shall thereafter retroactively adjust such Annual Rent within ten (10) days from
the determination of the fair market rental value of the Premises.

     Unless the context clearly requires otherwise, the word "Term" as used in
this Lease shall mean and include the period set forth in Section 2.2 above and
any period as to which the aforesaid option shall have been exercised.

                                      -8-
<PAGE>
 
2.4   INTENTIONALLY OMITTED


2.5   INTENTIONALLY OMITTED


                                  ARTICLE III

                                  CONSTRUCTION

3.1  ACCEPTANCE OF THE PREMISES.

     Tenant hereby agrees to accept the Premises "AS IS" and "AS SHOWN" as of
the Commencement Date, subject only to the provisions of this Lease.  Tenant
further acknowledges that neither Landlord nor any agent of Landlord has made
any representation, express or implied, written, verbal or otherwise as to the
condition of the Premises or the suitability of the Premises for Tenant's
intended use.

     All of Tenant's construction, installation of furnishings and later changes
or additions shall be coordinated with any work being performed by Landlord in
such manner as to maintain harmonious labor relations and not to damage the
Building or Lot or to interfere with Building operations.  Except for
installation of furnishings and the installation of telephone outlets which must
be performed by the local telephone company at Tenant's direction and expense,
the Leasehold Improvements shall be performed by Managing Agent.

     Landlord agrees to use reasonable efforts to complete the work described in
Exhibit B (the "Leasehold Improvements") on or before the Commencement Date.

     Costs incurred by Tenant in connection with the space planning,
architectural design and engineering of the Leasehold Improvements shall be paid
by Landlord.  Landlord shall pay for the Leasehold Improvements; provided,
however, that to the extent that the cost of the Leasehold Improvements exceeds
the Tenant's Allowance, Tenant shall promptly reimburse Landlord for one hundred
percent (100%) of such excess.  The Tenant Allowance shall be $13.00 per
rentable square foot of Tenant's Space.

     Landlord will not approve any construction, alterations, or additions
requiring unusual expense to readapt the Premises to normal office use on lease
termination (including, without limitation, construction of an internal stairway
between the first and second floor of the Premises) or increasing the cost of
construction, insurance or taxes on the Building or of Landlord's Services
called for by Section 5.1 unless Tenant first gives assurances acceptable to
Landlord that such readaptation will be 

                                      -9-
<PAGE>
 
made prior to such termination without expense to Landlord and makes provisions
acceptable to Landlord for payment of such increased cost. Landlord will also
disapprove any alterations or additions requested by Tenant which will delay
completion of the Premises or the Building. All changes and additions shall be
part of the Building except such items as by writing at the time of approval the
parties agree either shall be removed by Tenant on termination of this Lease, or
shall be removed or left at Tenant's election.

3.2  GENERAL PROVISIONS APPLICABLE TO CONSTRUCTION.

     All construction work required or permitted by this Lease, whether by
Landlord or by Tenant, shall be done in a good and workmanlike manner and in
compliance with all applicable laws and all lawful ordinances, regulations and
orders of governmental authority and insurers of the Building.  Either party may
inspect the work of the other at reasonable times and promptly shall give notice
of observed defects.

3.3  REPRESENTATIVES.

     Each party authorizes the other to rely in connection with their respective
rights and obligations under this Article III upon approval and other actions on
the party's behalf by a representative to be named by each party upon execution
hereof or by any person designated in substitution or addition by notice to the
party relying.

                                      -10-
<PAGE>
 
                                   ARTICLE IV

                                      RENT

4.1  RENT.

     Tenant agrees to pay rent to Landlord, without any offset or reduction
whatever (except as made in accordance with the express provisions of this
Lease), equal to 1/12th of the Annual Rent in equal installments in advance on
the first day of each calendar month included in the Term together with any
additional rent or other charges payable pursuant to this Lease (the sum of
Annual Rent plus any additional rent or other charges is hereinafter referred to
as the "Rent").

     (a) If the Commencement Date occurs on a day other than the first day of a
calendar month, Tenant shall pay to Landlord on the first day of the succeeding
calendar month a pro rata payment of Rent for the partial month from the Rent
Commencement Date to the first day of the succeeding calendar month.  Such
payment shall constitute payment for the partial month, if any, immediately
following the Rent Commencement Date.

     (b) Rent for any partial month shall be paid by Tenant to Landlord at such
rate on a pro rata basis.  Other charges payable by Tenant on a monthly basis,
as hereinafter provided, shall likewise be prorated.

     (c) Rent and any other sums due hereunder not paid within five (5) days of
the date due shall bear interest at the rate of one and one-half percent (1
1/2%) per month or fraction thereof (or at any lesser maximum legally
permissible rate) from the due date until paid.

     Other charges payable by Tenant on a monthly basis, as hereinafter
provided, shall likewise be prorated, and the first payment on account thereof
shall be determined in similar fashion.

4.2   OPERATING COSTS; TAXES; ESCALATION.

     (a) Commencing with the First Fiscal Year for Tenant's Paying Operating
Costs Escalation, the Annual Rent payable by Tenant shall be adjusted for
increases in operating costs, adjusted to reflect full occupancy for twelve
months ("LandLord's Operating Costs").  The amounts of such adjustments shall be
determined by:

     (i)   Comparing the Base Operating Costs with Landlord's Operating
           Costs for the Fiscal Year; and

                                      -11-
<PAGE>
 
     (ii)  Computing Tenant's share on the basis of Tenant's Proportionate
           Share of the difference between Base Operating Costs and
           Landlord's Operating Costs, such proportionate share being equal
           to a fraction, the numerator of which is the Rentable Floor Area
           of Tenant's Space, and the denominator of which is the Total
           Floor Area of the Building ("Tenant's Proportionate Share").

     (b) If Landlord's Operating Costs for any Fiscal Year exceed the Base
Operating Costs or if Landlord's Operating Costs for any partial Fiscal Year
exceed the corresponding fraction of Base Operating Costs, Tenant shall pay, as
additional rent, Tenant's Proportionate Share of such excess (such excess being
referred to hereinafter as "Operating Cost Excess").  Such amount shall be due
and payable after the close of the first Fiscal Year in which an Operating Cost
Excess occurs, on or before the thirtieth (30th) day following receipt by Tenant
of Landlord's Statement (as defined below).  As soon as practicable after the
end of each Fiscal Year ending during the Term and after Lease termination,
Landlord shall render a statement ("Landlord's Statement") in reasonable detail
and according to usual accounting practices certified by Landlord and showing
for the preceding Fiscal Year or fraction thereof, as the case may be,
Landlord's Operating Costs.

     (c)   For purposes of this Article "Landlord's Operating
Costs" shall include:

     (i)   premiums for insurance except premiums for loss of rent if such
           premiums are calculated independently of and not included as part
           of the provisions for other insurance carried by Landlord;

    (ii)   compensation and all fringe benefits, worker's compensation
           insurance premiums and payroll taxes paid by Landlord to, for or
           with respect to all persons engaged in operating, maintaining, or
           cleaning the Building and Lot (or if any of said persons are
           engaged in operating, maintaining or cleaning other buildings or
           lots, a pro rata share thereof as reasonably determined by
           Landlord based upon the percentage of time said persons spend at
           the Building or Lot);

    (iii)  all utility charges not billed directly to tenants by Landlord or
           the utility company, but not including the cost to Landlord of
           electricity furnished for lighting, electrical facilities,
           equipment, machinery, fixtures and appliances used by tenants in
           their respective space (other than 

                                      -12-
<PAGE>
 
           Building heating, ventilating, and air conditioning equipment) as set
           forth in Paragraph VII of Exhibit D;

     (iv)  payments to independent contractors under service contracts for
           cleaning, operating, managing, maintaining and repairing the
           Building and Lot (which payments may be to affiliates of Landlord
           provided the same are at reasonable and competitive rates
           consistent with the type of occupancy and the services rendered);

      (v)  rent paid by the managing agent or imputed costs equal to the
           loss of rent by Landlord for making available to the managing
           agent space for a Building office on the ground floor or above
           (which space shall not exceed 100 square feet of rentable floor
           area); and

     (vi)  all other reasonable and necessary expenses paid in connection
           with cleaning, operating, managing, maintaining and repairing the
           Building and Lot, or either, and properly chargeable against
           income, it being agreed that the cost of all repairs and
           replacements shall be limited to such repair and replacement that
           is properly expensed under the Internal Revenue Code, and it
           being further agreed that if Landlord installs a new or
           replacement capital item for the purpose of reducing Landlord's
           Operating Costs, the cost thereof as reasonably amortized by
           Landlord, with interest at the average prime commercial rate in
           effect from time to time at the then three largest national banks
           in Boston, Massachusetts or the amortized amount, shall be
           included in Landlord's Operating Costs.

     Landlord's Operating Costs shall be computed on an accrual basis and shall
be determined in accordance with generally accepted accounting principles
consistently applied.  Such costs may be incurred directly or by way of
reimbursement, and shall include taxes applicable thereto.  The following shall
be excluded from Landlord's Operating Costs:

     (i)  depreciation;

    (ii)  expenses relating to tenants' alterations;

   (iii)  expenses for which Landlord, by the terms of this Lease or any other
          lease, makes a separate charge;

                                      -13-
<PAGE>
 
    (iv)  the cost of any services or systems for that portion of the Building
          occupied by the Landlord or affiliates of Landlord (exclusive of space
          occupied by Landlord or affiliates of Landlord in connection with the
          operation of the Building) and which are not provided generally to
          other tenants in the Building;

     (v)  the cost of constructing additional parking spaces, which costs shall
          be treated as a capital cost by Landlord; and

    (vi)  leasing fees or commissions.

     In case of special services which are not rendered to all areas on a
comparable basis, the proportion allocable to the Premises shall be the same
proportion which the Rentable Floor Area of Tenant's Space bears to the total
rentable floor area to which such service is so rendered (such latter area to be
determined in the same manner as the Total Rentable Floor Area of the Building).

     (d) Commencing with the First Year for Tenant's Paying Tax Escalation, the
Annual Rent payable by Tenant shall be adjusted for increases in real estate
taxes, adjusted to reflect full occupancy for twelve months ("Landlord's Tax
Costs").  The amounts of such adjustments shall be determined by:

     (i)  Comparing the Base Tax Costs with Landlord's Tax Costs for the
          Tax Year; and

    (ii)  Computing Tenant's share on the basis of Tenant's Proportionate
          Share of the difference between Base Tax Costs and Landlord's Tax
          Costs.

     (e) If Landlord's Tax Costs for any Tax Year exceed the Base Tax Costs or
if Landlord's Tax Costs for any partial Tax Year exceed the corresponding
fraction of Base Tax Costs, Tenant shall pay, as additional rent, Tenant's
Proportionate Share of such excess (such excess being referred to hereinafter as
"Tax Excess").  Such amount shall be due and payable after the close of the
first Tax Year in which a Tax Excess occurs, on or before the thirtieth (30th)
day following receipt by Tenant of Landlord's Tax Statement (as defined below).
As soon as practicable after the end of each Tax Year ending during the Term and
after Lease termination, Landlord shall render a statement ("Landlord's Tax
Statement") in reasonable detail and according to usual accounting practices
certified by Landlord and showing 

                                      -14-
<PAGE>
 
for the preceding Tax Year or fraction thereof, as the case may be, Landlord's
Tax Costs.

     (e) For purposes of this Article "Landlord's Tax Costs" shall include:

     (i) real estate taxes on the Building and Lot, installments and
         interest on assessments for public betterments or public
         improvements; and

    (ii) reasonable expenses of any proceedings for abatement of taxes and
         assessments with respect to any Tax Year or fraction of a Tax
         Year;

     The term "real estate taxes" as used above shall mean all taxes of every
kind and nature assessed by any governmental authority on the Lot, the Building
and improvements, or both, which Landlord shall become obligated to pay because
of or in connection with the ownership, leasing and operation of the Lot, the
Building and improvements, or both, subject to the following: There shall be
excluded from such taxes all income taxes, excess profits taxes, excise taxes,
franchise taxes, and estate, succession, inheritance and transfer taxes,
provided, however, that if at any time during the Term the present system of ad
valorem taxation of real property shall be changed so that in lieu of the whole
or any part of the ad valorem tax on real property, there shall be assessed on
Landlord a capital levy or other tax on the gross rents received with respect to
the Lot, Building and improvements, or both, or a federal, state, county,
municipal, or other local income, franchise, excise or similar tax, assessment,
levy or charge (distinct from any now in effect) measured by or based, in whole
or in part, upon any such gross rents, then any and all of such taxes,
assessments, levies or charges, to the extent so measured or based, shall be
deemed to be included within the term "real estate taxes." If Landlord shall
receive any tax refund or reimbursement of taxes or sum in lieu thereof with
respect to any Tax Year then out of any balance remaining thereof after
deducting Landlord's expenses reasonably incurred in obtaining such refund,
Landlord shall credit against Tenant's next payment of Tax Excess, provided
there does not then exist a default of Tenant, an amount equal to Tenant's
Proportionate Share of such refund or reimbursement provided, that in no event
shall Tenant be entitled to a credit in excess of the amount of any payments
made by Tenant on account of real estate tax increases for such Tax Year
pursuant to this Section 4.2.

                                      -15-
<PAGE>
 
     Notwithstanding any other provision of Section 4.2 hereof, if the Term
expires or is terminated as of a date other than the last day of a Fiscal Year
or Tax Year as applicable, then for such fraction of a Fiscal Year or Tax Year
at the end of the Term, Tenant's last payment to Landlord under Section 4.2
shall be made on the basis of Landlord's best estimate of the items otherwise
includable in Landlord's Statement or Landlord's Tax Statement and shall be made
on or before the later of (a) ten (10) days after Landlord delivers such
estimate to Tenant or (b) the last day of the Term, with an appropriate payment
or refund upon submission of Landlord's Statement or Landlord's Tax Statement as
applicable which statement shall represent Landlord's actual costs.  Tenant
shall have the right, upon reasonable prior written notice to Landlord, to
examine Landlord's books and records with respect to the items in the
aforementioned Landlord's Statement or Landlord's Tax Statement during normal
business hours, provided that Landlord receive such notice within thirty (30)
days following the delivery to Tenant of Landlord's Statement.

4.3   ESTIMATED ESCALATION PAYMENTS.

     If, with respect to any fiscal year or tax year (as appropriate) or
fraction thereof during the Term, Landlord estimates that Tenant shall be
obligated to pay Operating Cost Escalation or Tax Escalation.  Then Tenant shall
pay, as additional rent, on the first day of each month of such fiscal year or
tax year (as appropriate) and each ensuing fiscal year thereafter, Estimated
Monthly Escalation Payments equal to 1/12th of the estimated Operating Cost
Escalation for the respective fiscal year plus 1/12 of the estimated Tax
Escalation for the respective Tax Year, with an appropriate additional payment
or refund to be made within thirty (30) days after Landlord's Statement or
Landlord's Tax Statement as applicable is delivered to Tenant.  Landlord may
adjust such Estimated Monthly Escalation Payment from time to time and at any
time during a fiscal year, and Tenant shall pay, as additional rent, on the
first day of each month following receipt of Landlord's notice thereof, the
adjusted Estimated Monthly Escalation Payment.

4.4   CHANGE OF FISCAL YEAR.

     Landlord shall have the right from time to time to change the periods of
accounting under Section 4.2 to any annual period other than a fiscal year, and
upon any such change all items referred to in ARTICLE IV shall be appropriately
apportioned.  In all Landlord's Statements rendered under ARTICLE IV, amounts
for periods partially within and partially without the accounting periods shall
be appropriately apportioned, and any items which are not determinable at the
time of a Landlord's Statement shall be included therein on the basis of
Landlord's estimate, and with 

                                      -16-
<PAGE>
 
respect thereto Landlord shall render promptly after determination a
supplemental Landlord's Statement, and appropriate adjustment shall be made
according thereto. All Landlord's Statements shall be prepared on an accrual
basis of accounting.

                                      -17-
<PAGE>
 
4.5   PAYMENTS.

     All payments of Annual Rent and additional rent shall be made to Managing
Agent, or to such other person as Landlord may from time to time designate.  If
any installment of Annual Rent or additional rent or on account of leasehold
improvements is paid more than five (5) days after the due date thereof, it
shall, at Landlord's election, bear interest at a rate equal to the average
prime commercial rate from time to time established by the three largest
national banks in Boston, Massachusetts plus 4% per annum from such due date,
which interest shall be immediately due and payable as further additional rent.

                                   ARTICLE V

                              LANDLORD'S COVENANTS

5.1   LANDLORD'S COVENANTS DURING THE TERM.

     Landlord covenants during the Term:

     5.1.1  Building Services  - To furnish, through Landlord's employees or
independent contractors, the services listed in Exhibit D;

     5.1.2  Additional Building Services  - To furnish, through Landlord's
employees or independent contractors, reasonable additional Building operation
services upon reasonable advance request of Tenant at equitable rates from time
to time established by Landlord to be paid by Tenant;

     5.1.3  Repairs  - Except as otherwise provided in ARTICLE VII of this
Lease, to make such repairs to the roof, exterior walls, floor slabs, other
structural components and common facilities of the Building as may be necessary
to keep them in serviceable condition; and

     5.1.4  Quiet Enjoyment  - That Landlord has the right to make this Lease
and that Tenant on paying the rent and performing its obligations hereunder
shall peacefully and quietly have, hold and enjoy the Premises throughout the
Term without any manner of hindrance or molestation from Landlord or anyone
claiming under Landlord, subject however to all the terms and provisions hereof.

5.2   INTERRUPTIONS.

     Landlord shall not be liable to Tenant for any compensation or reduction of
rent by reason of inconvenience or annoyance or for loss of business arising
from power losses or shortages or from the necessity of Landlord's entering the
Premises for any of

                                      -18-
<PAGE>
 
the purposes authorized in this Lease or for repairing the Premises or any
portion of the Building or Lot. In case Landlord is prevented or delayed from
making any repairs, alterations or improvements, or furnishing any service or
performing any other covenant or duty to be performed on Landlord's part, by
reason of any cause beyond Landlord's reasonable control, Landlord shall not be
liable to Tenant therefor, nor, except as expressly otherwise provided in
ARTICLE VII, shall Tenant be entitled to any abatement or reduction of rent by
reason thereof, nor shall the same give rise to a claim in Tenant's favor that
such failure constitutes actual or constructive, total or partial, eviction from
the Premises.

     Landlord reserves the right to stop any service or utility system when
necessary by reason of accident or emergency or until necessary repairs have
been completed.  Except in case of emergency repairs, Landlord will give Tenant
reasonable advance notice of any contemplated stoppage and will use reasonable
efforts to avoid unnecessary inconvenience to Tenant by reason thereof.

     Landlord also reserves the right to institute such policies, programs and
measures as may be necessary, required or expedient for the conservation or
preservation of energy or energy services or as may be necessary or required to
comply with applicable codes, rules, regulations or standards.


                                   ARTICLE VI

                               TENANT'S COVENANTS

6.1  TENANT'S COVENANTS DURING THE TERM.

     Tenant covenants during the Term and such further time as
Tenant occupies any part of the Premises:

     6.1.1  Tenant's Payments  - To pay when due (a) all Annual Rent and
additional rent, (b) all taxes which may be imposed on Tenant's personal
property in the Premises (including, without limitation, Tenant's fixtures and
equipment) regardless to whomever assessed, (c) all charges by public utilities
for telephone and other utility services (including service inspections
therefor) rendered to the Premises not otherwise required hereunder to be
furnished by Landlord without charge and not consumed in connection with any
services required to be furnished by Landlord without charge and (d) as
additional rent, all charges of Landlord for services rendered pursuant to
Section 5.1.2 hereof;

                                      -19-
<PAGE>
 
     6.1.2  Repairs and Yielding Up  - Except as otherwise provided in ARTICLE
VII and Section 5.1.3, to keep the Premises in good order, repair and condition,
reasonable wear only excepted; and at the expiration or termination of @@his
Lease peaceably to yield up the Premises and all changes and additions therein
in such order, repair and condition, first removing all goods and effects of
Tenant and any items, the removal of which is required by agreement or specified
herein to be removed at Tenant's election and which Tenant elects to remove, and
repairing all damage caused by such removal and restoring the Premises and
leaving them clean and neat;

     6.1.3  Occupancy and Use  - To use and occupy the Premises only for the
Permitted Uses; not to injure or deface the Premises, Building, or Lot; and not
to permit in the Premises any use thereof which is improper, offensive, contrary
to law or ordinance, or liable to create a nuisance or to invalidate or increase
the premiums for any insurance on the Building or its contents or liable to
render necessary any alteration or addition to the Building;

     6.1.4  Rules and Regulations  - To comply with the Rules and Regulations
set forth in Exhibit E and all other reasonable Rules and Regulations hereafter
made by Landlord, of which Tenant has been given notice, for the care and use of
the Building and Lot and their facilities and approaches, it being understood
that Landlord shall not be liable to Tenant for the failure of other tenants of
the Building to conform to such Rules and Regulations;

     6.1.5  Safety Appliances  - To keep the Premises equipped with all safety
appliances required by law or ordinance or any other regulation of any public
authority because of any use made by Tenant and to procure all licenses and
permits so required because of such use and, if requested by Landlord, to do any
work so required because of such use, it being understood that the foregoing
provisions shall not be construed to broaden in any way Tenant's Permitted Uses;

     6.1.6  Assignment and Subletting  - Not without the prior written consent
of Landlord to assign this Lease, to make any sublease, or to permit occupancy
of the Premises or any part thereof by anyone other than Tenant, voluntarily or
by operation of law (it being understood that in no event shall Landlord consent
to any such assignment, sublease or occupancy if the same is on terms more
favorable to the successor occupant than to the then occupant); as additional
rent, to reimburse Landlord promptly for reasonable legal and other expenses
incurred by Landlord in connection with any request by Tenant for consent to
assignment or subletting; no assignment or subletting shall affect the
continuing primary liability of Tenant (which, following assignment, shall be
joint and several with the 

                                      -20-
<PAGE>
 
assignee); no consent to any of the foregoing in a specific instance shall
operate as a waiver in any subsequent instance. Landlord's consent to assignment
or subletting by Tenant shall not be unreasonably withheld, provided that such
assignee or subtenant pays therefor the greater of the Annual Rent and
additional rent then payable hereunder, or the then fair market rent for the
Premises as reasonably determined by Landlord; and provided further that
Landlord shall not be deemed unreasonable for withholding its consent to any
assignment or subletting the arrangements for which are to be made through any
broker other than Landlord or its affiliates. In the event that any assignee or
subtenant pays to Tenant any amounts in excess of the Annual Rent and additional
rent then payable hereunder, or pro rata portion thereof on a square footage
basis for any portion of the Premises, Tenant shall promptly pay fifty percent
(50%) of said excess to Landlord as and when received by Tenant. If Tenant
requests Landlord's consent to assign this Lease or sublet more than twenty-five
percent (25%) of the Premises, Landlord shall have the option, exercisable by
written notice to Tenant given within ten (10) days after receipt of such
request, to terminate this Lease as of a date specified in such notice which
shall not be less than thirty (30) or more than sixty (60) days after the date
of such notice;

     6.1.7  Indemnity  - To defend, with counsel reasonably acceptable to
Landlord, save harmless and indemnify Landlord from any liability for injury,
loss, accident or damage to any person or property and from any claims, actions,
proceedings and expenses and costs in connection therewith (including, without
implied limitation, reasonable counsel fees): (i) arising from the omission,
fault, willful act, negligence or other misconduct of Tenant or from any use
made or thing done or occurring on the Premises not due to the gross negligence
of Landlord or (ii) resulting from the failure of Tenant to perform and
discharge its covenants and obligations under this Lease;

     6.1.8  Tenant's Liability Insurance  - To maintain public liability
insurance on the Premises in amounts which shall, at the beginning of the Term,
be at least equal to the limits set forth in Section 1.1 of this Lease, and from
time to time during the Term, shall be for such higher limits, if any, as are
customarily carried in the area in which the Premises are located on property
similar to the Premises and used for similar purposes and to furnish Landlord
with certificates thereof;

     6.1.9  Tenant's Worker's Compensation Insurance  - To keep all of Tenant's
employees working in the Premises covered by worker's compensation insurance in
statutory amounts and to furnish Landlord with certificates thereof;

                                      -21-
<PAGE>
 
     6.1.10   Landlord's Right of Entry  - To permit Landlord and Landlord's
agents entry: to examine the Premises at reasonable times and, if Landlord shall
so elect, to make repairs or replacements; to remove, at Tenant's expense, any
changes, additions, signs, curtains, blinds, shades, awnings, aerials, flagpoles
or the like to which Landlord has not consented in writing; and to show the
Premises to prospective tenants during the twelve (12) months preceding
expiration of the Term and to prospective purchasers and mortgagees at all
reasonable times;

     6.1.11   Loading  - Not to place a load upon the Premises exceeding an
average rate of fifty (50) pounds of live load per square foot or floor area,
and not to move any safe, vault or other heavy equipment in, about or out of the
Premises except in such manner and at such times as Landlord shall in each
instance approve; Tenant's business machines and mechanical equipment which
cause vibration or noise that may be transmitted to the Building structure or to
any other leased space in the Building shall be placed and maintained by Tenant
in settings of cork, rubber, spring or other types of vibration eliminators
sufficient to eliminate such vibration or noise;

     6.1.12   Landlord's Costs  - In case Landlord shall be made party to any
litigation commenced by or against Tenant or by or against any parties in
possession of the Premises or any part thereof claiming under Tenant, to pay, as
additional rent, all costs including, without implied limitation, reasonable
counsel fees incurred by or imposed upon Landlord in connection with such
litigation and, as additional rent, also to pay all such costs and fees incurred
by Landlord in connection with the successful enforcement by Landlord of any
obligations of Tenant under this Lease;

     6.1.13   Tenant's Property  - All the furnishings, fixtures, equipment,
effects and property of every kind, nature and description of Tenant and of all
persons claiming by, through or under Tenant which, during the continuance of
this Lease or any occupancy of the Premises by Tenant or anyone claiming under
Tenant, may be on the Premises or elsewhere in the Building or on the Lot shall
be at the sole risk and hazard of Tenant and, if the whole or any part thereof
shall be destroyed or damaged by fire, water or otherwise, or by the leakage or
bursting of water pipes, steam pipes or other pipes, by theft, or from any other
cause, no part of said loss or damage is to be charged to or to be borne by
Landlord unless due to the gross negligence of Landlord;

     6.1.14  Labor or Materialmen's Liens  - To pay promptly when due the entire
cost of any work done on the Premises by Tenant, its agents, employees or
independent contractors; not to cause or permit any liens for labor or materials
performed or 

                                      -22-
<PAGE>
 
furnished in connection therewith to attach to the Premises; and immediately to
discharge any such liens which may so attach;

     6.1.15  Changes or Additions  - Not to make any changes or additions to the
Premises without Landlord's prior written consent, provided that Tenant shall
reimburse Landlord, as additional rent, for all costs incurred by Landlord in
reviewing Tenant's proposed changes or additions, and provided further that, in
order to protect the functional integrity of the Building, all such changes and
additions shall be performed by Managing Agent; and

     6.1.16  Holdover  - To pay to Landlord one and one-half times the total of
the Annual Rent and additional rent then applicable for each month or portion
thereof Tenant shall retain possession of the Premises or any part thereof after
the termination of this Lease, whether by lapse of time or otherwise, and also
to pay all damages sustained by Landlord on account thereof; the provisions of
this subsection shall not operate as a waiver by Landlord of the right of re-
entry provided in this Lease; at the option of Landlord exercised by a written
notice given to Tenant while such holding over continues, such holding over
shall constitute an extension of this Lease for a period of one year.

     6.1.17  Right of Financial Review  - To allow Landlord and any holder of a
mortgage on the Premises to examine Tenant's financial statements, audited
financial statements if available, upon reasonable advance notice from Landlord
to Tenant.  Such review shall be conducted no more frequently than once in any
six (6) month period.


                                  ARTICLE VII

                              CASUALTY AND TAKING

7.1   CASUALTY AND TAKING.

     In case during the Term all or any substantial part of the Premises,
Building or Lot, or any one or more of them, are damaged materially by fire or
any other cause or by action of public or other authority in consequence thereof
or are taken by eminent domain or Landlord receives compensable damage by reason
of anything lawfully done in pursuance of public or other authority, this Lease
shall terminate at Landlord's election, which may be made, notwithstanding
Landlord's entire interest may have been divested, by notice to Tenant within
thirty (30) days after the occurrence of the event giving rise to the election
to terminate, which notice shall specify the effective date of termination which
shall be not less than thirty (30) nor more 

                                      -23-
<PAGE>
 
than sixty (60) days after the date of notice of such termination. If in any
such case the Premises are rendered unfit for use and occupation and the Lease
is not so terminated, Landlord shall use due diligence to put the Premises, or,
in case of a taking, what may remain thereof (excluding any items installed or
paid for by Tenant which Tenant may be required or permitted to remove) into
proper condition for use and occupation to the extent permitted by the net award
of insurance or damages available to Landlord, and a just proportion of the
Annual Rent and additional rent according to the nature and extent of the injury
shall be abated until the Premises or such remainder shall have been put by
Landlord in such condition; and in case of a taking which permanently reduces
the area of the Premises, a just proportion of the Annual Rent and additional
rent shall be abated for the remainder of the Term and an appropriate adjustment
shall be made to the Annual Estimated Operating Expenses.

7.2   RESERVATION OF AWARD.

     Landlord reserves to itself any and all rights to receive awards made for
damages to the Premises, Building or Lot and the leasehold hereby created, or
any one or more of them, accruing by reason of exercise of eminent domain or by
reason of anything lawfully done in pursuance of public or other authority.
Tenant hereby releases and assigns to Landlord all Tenant's rights to such
awards and covenants to deliver such further assignments and assurances thereof
as Landlord may from time to time request and hereby irrevocably designates and
appoints Landlord as its attorney-in-fact to execute and deliver to Tenant's
name and behalf all such further assignments thereof. It is agreed and
understood, however, that Landlord does not reserve to itself, and Tenant does
not assign to Landlord, any damages payable for (i) movable trade fixtures
installed by Tenant, or anybody claiming under Tenant, at its own expense or
(ii) relocation expenses recoverable by Tenant from such authority in a separate
action.


                                  ARTICLE VIII

                              RIGHTS OF MORTGAGEE

8.1   PRIORITY OF LEASE.

     This Lease is and shall continue to be subject and
subordinate to any presently existing mortgage or deed of trust of record
covering the Lot or Building or both (the "mortgaged premises").  The holder of
such presently existing mortgage or deed of trust shall have the election to
subordinate the same to the rights and interests of Tenant under this Lease
exercisable by filing with the appropriate recording office a notice of such

                                      -24-
<PAGE>
 
election, whereupon the Tenant's rights and interests hereunder shall have
priority over such mortgage or deed of trust.

     Unless the option provided for in the next following sentence shall be
exercised, this Lease shall be superior to and shall not be subordinate to, any
mortgage, deed of trust or other voluntary lien hereafter placed on the
mortgaged premises.  The holder of any such mortgage, deed of trust or other
voluntary lien shall have the option to subordinate this Lease to the same,
provided that such holder enters into an agreement with Tenant by the terms of
which the holder will agree to recognize the rights of Tenant under this Lease
and to accept Tenant as tenant of the Premises under the terms and conditions of
this Lease in the event of acquisition of title by such holder through
foreclosure proceedings or otherwise and Tenant will agree to recognize the
holder of such mortgage as Landlord in such event, which agreement shall be made
to expressly bind and inure to the benefit of the successors and assigns of
Tenant and of the holder and upon anyone purchasing the mortgaged premises at
any foreclosure sale.  Any such mortgage to which this Lease shall be
subordinated may contain such terms, provisions and conditions as the holder
deems usual or customary.

8.2  RIGHTS OF MORTGAGE HOLDERS; LIMITATION OF MORTGAGEE'S 
     LIABILITY.

     The word "mortgage" as used herein includes mortgages, deeds
of trust or other similar instruments evidencing other voluntary liens or
encumbrances and modifications, consolidations, extensions, renewals,
replacements and substitutes thereof.  The word "holder" shall mean a mortgagee
and any subsequent holder or holders of a mortgage.  Until the holder of a
mortgage shall enter and take possession of the Premises for the purpose of
foreclosure, such holder shall have only such rights of Landlord as are
necessary to preserve the integrity of this Lease as security.  Upon entry and
taking possession of the Premises for the purpose of foreclosure, such holder
shall have all the rights of Landlord.  Notwithstanding any other provision of
this Lease to the contrary, including without limitation Section 10.4, no such
holder of a mortgage shall be liable, either as mortgagee or as assignee, to
perform, or be liable in damages for failure to perform, any of the obligations
of Landlord unless and until such holder shall enter and take possession of the
Premises for the purpose of foreclosure, and such holder shall not in any event
be liable to perform or liable in damages for failure to perform the obligations
of Landlord under Section 3.1.  Upon entry for the purpose of foreclosure, such
holder shall be liable to perform all of the obligations of Landlord (except for
the obligations under Section 3.1), subject to and with the benefit of the
provisions of Section 10.4, provided that a discontinuance of any 

                                      -25-
<PAGE>
 
foreclosure proceeding shall be deemed a conveyance under said provisions to the
owner of the equity of the Premises.

8.3   MORTGAGEE'S ELECTION.

     Notwithstanding any other provision to the contrary contained in this
Lease, if prior to substantial completion of Landlord's obligations under
Article III, any holder of a first mortgage on the mortgaged premises enters and
takes possession thereof for the purpose of foreclosing the mortgage, such
holder may elect, by written notice given to Tenant and Landlord at any time
within ninety (90) days after such entry and taking of possession, not to
perform Landlord's obligations under Article III, and in such event such holder
and all persons claiming under it shall be relieved of all obligations to
perform, and all liability for failure to perform, said Landlord's obligations
under Article III, and Tenant may terminate this Lease and all its obligations
hereunder by written notice to Landlord and such holder given within thirty (30)
days after the day on which such holder shall have given its notice as
aforesaid.

8.4  NO PREPAYMENT OR MODIFICATION, ETC.

     Tenant shall not pay Annual Rent, additional rent or any

other charge more than ten (10) days prior to the due dates thereof.  No
prepayment of Annual Rent, additional rent or other charge, no assignment of
this Lease and no agreement to modify so as to reduce the rent, change the Term
or otherwise materially change the rights of Landlord under this Lease, or to
relieve Tenant of any obligations or liability under this Lease, shall be valid
unless consented to in writing by Landlord's mortgagees of record, if any.

8.5  NO RELEASE OR TERMINATION.

     No act or failure to act on the part of Landlord which would entitle Tenant
under the terms of this Lease, or by law, to be relieved of Tenant's obligations
hereunder or to terminate this Lease, shall result in a release or termination
of such obligations or a termination of this Lease unless (i) Tenant shall have
first given written notice of Landlord's act or failure to act to Landlord's
mortgagees of record, if any, specifying the act or failure to act on the part
of Landlord which could or would give basis to Tenant's rights and (ii) such
mortgagees, after receipt of such notice, have failed or refused to correct or
cure the condition complained of within a reasonable time thereafter, but
nothing contained in this Section 8.5 shall be deemed to impose any obligation
on any such mortgagee to correct or cure any such condition. "Reasonable time"
as used above means and includes a reasonable time to obtain possession of the
mortgaged premises, if the mortgagee

                                      -26-
<PAGE>
 
elects to do so, and a reasonable time to correct or cure the condition if such
condition is determined to exist.

8.6   CONTINUING OFFER.

     The covenants and agreements contained in this Lease with respect to the
rights, powers and benefits of a mortgagee (particularly, without limitation
thereby, the covenants and agreements contained in this Article VIII) constitute
a continuing offer to any person, corporation or other entity, which by
accepting or requiring an assignment of this Lease or by entry or foreclosure
assumes the obligations herein set forth with respect to such mortgagee; such
mortgagee is hereby constituted a party to this Lease as an obligee hereunder to
the same extent as though its name were written herein as such; and such
mortgagee shall be entitled to enforce such provisions in its own name.  Tenant
agrees on request of Landlord to execute and deliver from time to time any
agreement which may reasonably be deemed necessary to implement the provisions
of this Article VIII.

8.7  MORTGAGEE'S APPROVAL.

     Landlord's obligation to perform its covenants and agreements hereunder is
subject to the condition precedent that this Lease be approved by the holder of
any mortgage of which the Premises are a part and by the issuer of any
commitment to make a mortgage loan which is in effect on the date hereof.
Unless Landlord gives Tenant written notice within thirty (30) business days
after the date hereof that such holder or issuer, or both, disapprove this
Lease, then this condition shall be deemed to have been satisfied or waived and
the provisions of this Section 8.6 shall be of no further force or effect.


                                   ARTICLE IX

                                    DEFAULT

9.1  EVENTS OF DEFAULT.

     If any default by Tenant continues after notice, in case of Annual Rent,
additional rent, or any other monetary obligation to Landlord for more than ten
(10) days or, in any other case, for more than thirty (30) days and such
additional time, if any, as is reasonably necessary to cure the default if the
default is of such a nature that it cannot reasonably be cured in thirty (30)
days and Tenant diligently endeavors to cure such default; of if Tenant is in
default (beyond any applicable grace period) under that lease with Landlord
dated September 21, 1993, as amended, with respect to certain other space in the
Building; or if Tenant 

                                      -27-
<PAGE>
 
becomes insolvent, fails to pay its debts as they fall due, files a petition
under any chapter of the U.S. Bankruptcy Code, 11 U.S.C. 101 et seq., as it may
be amended (or any similar petition under any insolvency law of any
jurisdiction), or if such petition is filed against Tenant; or if Tenant
proposes any dissolution, liquidation, composition, financial reorganization or
recapitalization with creditors, makes an assignment or trust mortgage for the
benefit of creditors, or if a receiver, trustee, custodian or similar agent is
appointed or takes possession with respect to any property of Tenant; or if the
leasehold hereby created is taken on execution or other process of law in any
action against Tenant; then, and in any such case, Landlord and the agents and
servants of Landlord may, in addition to and not in derogation of any remedies
for any preceding breach of covenant, immediately or at any time thereafter
while such default continues and without further notice, at Landlord's election,
do any one or more of the following: (1) give Tenant written notice stating that
the Lease is terminated, effective upon the giving of such notice or upon a date
stated in such notice, as Landlord may elect, in which event the Lease shall be
irrevocably extinguished and terminated as stated in such notice without any
further action, or (2) with or without process of law, in a lawful manner, enter
and repossess the Premises as of Landlord's former estate, and expel Tenant and
those claiming through or under Tenant, and remove its and their effects,
without being guilty of trespass, in which event the Lease shall be irrevocably
extinguished and terminated at the time of such entry, or (3) pursue any other
rights or remedies permitted by law. Any such termination of the Lease shall be
without prejudice to any remedies which might otherwise be used for arrears of
rent or prior breach of covenant, and in the event of such termination Tenant
shall remain liable under this Lease as hereinafter provided. Tenant hereby
waives all statutory rights (including, without limitation, rights of
redemption, if any) to the extent such rights may be lawfully waived, and
Landlord, without notice to Tenant, may store Tenant's effects and those of any
person claiming through or under Tenant at the expense and risk of Tenant and,
if Landlord so elects, may sell such effects at public auction or private sale
and apply the net proceeds to the payment of all sums due to Landlord from
Tenant, if any, and pay over the balance, if any, to Tenant.

9.2  TENANT'S OBLIGATIONS AFTER TERMINATION.

     In the event that this Lease is terminated under any of the provisions
contained in Section 9.1 or shall be otherwise terminated for breach of any
obligation of Tenant, Tenant covenants to pay forthwith to Landlord, as
compensation, (a) a sum equal to the tenant allowances paid by Landlord as set
forth in Article II and Article III and (b) the excess of the total rent
reserved for the residue of the Term over the rental value 

                                      -28-
<PAGE>
 
of the Premises for said residue of the Term. In calculating the rent reserved,
there shall be included, in addition to the Annual Rent and all additional rent,
the value of all other consideration agreed to be paid or performed by Tenant
for said residue. Tenant further covenants as an additional and cumulative
obligation after any such ending to pay punctually to Landlord all the sums and
perform all the obligations which Tenant covenants in this Lease to pay and to
perform in the same manner and to the same extent and at the same time as if
this Lease had not been terminated. In calculating the amounts to be paid by
Tenant under the next foregoing covenant, Tenant shall be credited with any
amount paid to Landlord as compensation as provided in the first sentence of
this Section 9.2 and also with the net proceeds of any rents obtained by
Landlord by re-letting the Premises, after deducting all Landlord's expenses in
connection with such re-letting, including, without implied limitation, all
repossession costs, brokerage commissions, fees for legal services and expenses
of preparing the Premises for such re-letting, it being agreed by Tenant that
Landlord may (i) re-let the Premises or any part or parts thereof for a term or
terms which may at Landlord's option be equal to or less than or exceed the
period which would otherwise have constituted the balance of the Term and may
grant such concessions and free rent as Landlord in its sole judgment considers
advisable or necessary to re-let the same and (ii) make such alterations,
repairs and decorations in the Premises as Landlord in its sole judgment
considers advisable or necessary to re-let the same, and no action of Landlord
in accordance with the foregoing or failure to re-let or to collect rent under
re-letting shall operate or be construed to release or reduce Tenant's liability
as aforesaid.

     So long as at least twelve (12) months of the Term remain unexpired at the
time of such termination, in lieu of any other damages or indemnity and in lieu
of full recovery by Landlord of all sums payable under all the foregoing
provisions of this Section 9.2, Landlord may by written notice to Tenant, at any
time after this Lease is terminated under any of the provisions contained in
Section 9.l, or is otherwise terminated for breach of any obligation of Tenant
and before such full recovery, elect to recover, and Tenant shall thereupon pay,
as liquidated damages, an amount equal to the aggregate of the Annual Rent and
additional rent accrued under Article IV in the twelve (12) months ended next
prior to such termination plus the amount of Annual Rent and additional rent of
any kind accrued and unpaid at the time of termination and less the amount of
any recovery by Landlord under the foregoing provisions of this Section 9.2 up
to the time of payment of such liquidated damages.

     Nothing contained in this Lease shall, however, limit or prejudice the
right of Landlord to prove and obtain in proceedings for bankruptcy or
insolvency by reason of the 

                                      -29-
<PAGE>
 
termination of this Lease, an amount equal to the maximum allowed by any statute
or rule of law in effect at the time when, and governing the proceedings in
which, the damages are to be proved, whether or not the amount be greater, equal
to, or less than the amount of the loss or damages referred to above.

                                   ARTICLE X

                                 MISCELLANEOUS
10.1  NOTICE OF LEASE.

     Upon request of either party, both parties shall execute and deliver, after
the Term begins, a short form of this Lease in form appropriate for recording or
registration, and if this Lease is terminated before the Term expires, an
instrument in such form acknowledging the date of termination.

10.2  INTENTIONALLY OMITTED.

10.3  NOTICES FROM ONE PARTY TO THE OTHER.

     All notices required or permitted hereunder shall be in writing and
addressed, if to the Tenant, at Tenant's Address or such other address as Tenant
shall have last designated by notice in writing to Landlord and, if to Landlord,
at Landlord's Address or such other address as Landlord shall have last
designated by notice in writing to Tenant.  Any notice shall be deemed duly
given when mailed to such address postage prepaid, registered or certified mail,
return receipt requested, or when delivered to such address by hand.

10.4  BIND AND INURE.

     The obligations of this Lease shall run with the land and this Lease shall
be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns, except that the Landlord named herein and
each successive owner of the Premises shall be liable only for the obligations
accruing during the period of its ownership.  The obligations of Landlord shall
be binding upon the assets of Landlord which comprise the Premises: but not upon
other assets of Landlord.  No individual partner, trustee, stockholder, officer,
director, employee or beneficiary of Landlord shall be personally liable under
this Lease and Tenant shall look solely to Landlord's interest in the Premises
in pursuit of its remedies upon an event of default hereunder, and the general
assets of the individual partners, trustees, stockholders, officers, employees
or beneficiaries of Landlord shall not be subject to levy, execution or other
enforcement procedure for the satisfaction of the remedies of Tenant.

                                      -30-
<PAGE>
 
10.5  NO SURRENDER.

     The delivery of keys to any employee of Landlord or to Landlord's agent or
any employee thereof shall not operate as a termination of this Lease or a
surrender of the Premises.

10.6  NO WAIVER, ETC.

     The failure of Landlord or of Tenant to seek redress for violation of, or
to insist upon the strict performance of, any covenant or condition of this
Lease or, with respect to such failure of Landlord, any of the Rules and
Regulations referred to in Section 6.1.4, whether heretofore or hereafter
adopted by Landlord, shall not be deemed a waiver of such violation nor prevent
a subsequent act, which would have originally constituted a violation, from
having all the force and effect of an original violation, nor shall the failure
of Landlord to enforce any of said Rules and Regulations against any other
tenant in the Building be deemed a waiver of any such Rules or Regulations.  The
receipt by Landlord of Annual Rent or additional rent with knowledge of the
breach of any covenant of this Lease shall not be deemed a waiver of such breach
by Landlord, unless such waiver be in writing and signed by Landlord.  No
consent or waiver, express or implied, by Landlord or Tenant to or of any breach
of any agreement or duty shall be construed as a waiver or consent to or of any
other breach of the same or any other agreement or duty.

10.7  NO ACCORD AND SATISFACTION.

     No acceptance by Landlord of a lesser sum than the Annual Rent and
additional rent then due shall be deemed to be other than on account of the
earliest installment of such rent due, nor shall any endorsement or statement on
any check or any letter accompanying any check or payment as rent be deemed as
accord and satisfaction, and Landlord may accept such check or payment without
prejudice to Landlord's right to recover the balance of such installment or
pursue any other remedy in this Lease provided.

10.8  CUMULATIVE REMEDIES.

The specific remedies to which Landlord may resort under the terms of this Lease
are cumulative and are not intended to be exclusive of any other remedies or
means of redress to which it may be lawfully entitled in case of any breach or
threatened breach by Tenant of any provisions of this Lease.  In addition to the
other remedies provided in this Lease, Landlord shall be entitled to the
restraint by injunction of the violation or attempted or threatened violation of
any of the covenants, conditions or provisions of this Lease or to a decree
compelling 

                                      -31-
<PAGE>
 
specific performance of any such covenants, conditions or provisions.

10.9  LANDLORD'S RIGHT TO CURE.

     If Tenant shall at any time default in the performance of any obligation
under this Lease, Landlord shall have the right, but shall not be obligated, to
enter upon the Premises and to perform such obligation, notwithstanding the fact
that no specific provision for such substituted performance by Landlord is made
in this Lease with respect to such default.  In performing such obligation,
Landlord may make any payment of money or perform any other act.  All sums so
paid by Landlord (together with interest at the rate of 4% per annum in excess
of the then average prime commercial rate of interest being charged by the three
largest national banks in Boston, Massachusetts), and all necessary incidental
costs and expenses in connection with the performance of any such act by
Landlord, shall be deemed to be additional rent under this Lease and shall be
payable to Landlord immediately on demand.  Landlord may exercise the foregoing
rights without waiving any other of its rights or releasing Tenant from any of
its obligations under this Lease.

10.10  ESTOPPEL CERTIFICATE.

     Tenant agrees, from time to time, upon not less than fifteen (15) days'
prior written request by Landlord, to execute, acknowledge and deliver to
Landlord a statement in writing certifying that this Lease is unmodified and in
full force and effect; that Tenant has no defenses, offsets or counterclaims
against its obligations to pay the Annual Rent and additional rent and to
perform its other covenants under this lease; that there are no uncured defaults
of Landlord or Tenant under this Lease (or, if there have been modifications,
that this Lease is in full force and effect as modified and stating the
modifications and, if there are any defenses, offsets, counterclaims, or
defaults, setting them forth in reasonable detail); and the dates to which the
Annual Rent, additional rent and other charges have been paid.  Any such
statement delivered pursuant to this Section 10.10 shall be in a form reasonably
acceptable to and may be relied upon by any prospective purchaser or mortgagee
of premises which include the Premises or any prospective assignee of any such
mortgagee.

10.11  WAIVER OF SUBROGATION.

     Any insurance carried by either party with respect to the Premises and
property therein or occurrences thereon shall include a clause or endorsement
denying to the insurer rights of subrogation against the other party to the
extent rights have been waived by the insured prior to occurrences of injury or

                                      -32-
<PAGE>
 
loss.  Each party, notwithstanding any provisions of this Lease to the contrary,
hereby waives any rights of recovery against the other for injury or loss due to
hazards covered by insurance containing such clause or endorsement to the extent
of the indemnification received thereunder.

10.12  ACTS OF GOD.

     In any case where either party hereto is required to do any act (other than
the payment of rent), delays caused by or resulting from Acts of God, war, civil
commotion, fire, flood or other casualty, labor difficulties, shortages of
labor, materials or equipment, government regulations, unusually severe weather
or other causes beyond such party's reasonable control shall not be counted in
determining the time during which work shall be completed, whether such time be
designated by a fixed date, a fixed time or a "reasonable time," and such time
shall be deemed to be extended by the period of such delay.

10.13  BROKERAGE.

     Tenant represents and warrants that it has dealt with no broker in
connection with this transaction other than Meredith & Grew, Incorporated and
agrees to defend, with counsel approved by Landlord, indemnify and save Landlord
harmless from and against any and all cost, expense or liability for any
compensation, commissions or charges claimed by a broker or agent, other than
with Meredith & Grew, Incorporated, with respect to Tenant's dealings in
connection with this Lease.

10.14  SUBMISSION NOT AN OFFER.

     The submission of a draft of this Lease or a summary of some or all of its
provisions does not constitute an offer to lease or demise the Premises, it
being understood and agreed that neither Landlord nor Tenant shall be legally
bound with respect to the leasing of the Premises unless and until this Lease
has been executed by both Landlord and Tenant and a fully executed copy has been
delivered to each of them.

10.15  APPLICABLE LAW AND CONSTRUCTION.

     This Lease shall be governed by and construed in accordance with the laws
of the state in which the Premises are located.  If any term, covenant,
condition or provision of this Lease or the application thereof to any person or
circumstances shall be declared invalid or unenforceable by the final ruling of
a court of competent jurisdiction having final review, the remaining terms,
covenants, conditions and provisions of this Lease and their application to
persons or circumstances shall not be affected thereby and shall continue to be
enforced and recognized 

                                      -33-
<PAGE>
 
as valid agreements of the parties, and in the place of such invalid or
unenforceable provision, there shall be substituted a like, but valid and
enforceable provision which comports to the findings of the aforesaid court and
most nearly accomplishes the original intention of the parties.

     The titles of the several Articles and Sections contained herein are for
convenience only and shall not be considered in construing this Lease.

     Unless repugnant to the context, the words "Landlord" and "Tenant"
appearing in this Lease shall be construed to mean those named above and their
respective heirs, executors, administrators, successors and assigns, and those
claiming through or under them respectively.  If there be more than one tenant.,
the obligations imposed by this Lease upon Tenant shall be joint and several.

     EXECUTED as a sealed instrument on the day and year first above written.

                                          LANDLORD:  L&E INVESTMENT OF
                                          MASSACHUSETTS ONE, INC.

                                          By:/s/ David C. Sherwood
                                             ---------------------


                                          TENANT:  CREDIT TECHNOLOGIES, INC.

                                          By:_________________________________
                                             Pamela D. A. Reeve, Its President

                                          By:/s/ William G. Brown
                                             ---------------------------------
                                             William G. Brown, Its Treasurer and
                                             Vice President of Finance

                                      -34-
<PAGE>
 
                                   EXHIBIT A
                                   ---------
                                        

                          [Floor Plan -- Second Floor]
                                        

                                      -35-
<PAGE>
 
                                   EXHIBIT B
                                   ---------
                                        
                                 Somerset Court
                               281 Winter Street
                             Waltham, Massachusetts
                                        
                    SPECIFICATION OF LEASEHOLD IMPROVEMENTS
                    ---------------------------------------
                                        
Work shown on plans to be prepared for Tenant by Landlord's architect and
approved by Landlord, such approval not to be unreasonably withheld.  In the
event that such plans are not completed on or before October 1, 1994, the
Commencement Date shall, nevertheless, be deemed to be the earlier of December
1, 1994 or the date of the substantial completion of the Leasehold Improvements.

                                      -36-
<PAGE>
 
                                   EXHIBIT C
                                   ---------
                                Somerset Court
                               281 Winter Street
                            Waltham, Massachusetts

                              BUILDING STANDARDS
                              ------------------

The Tenant will receive the following Tenant Improvements, which are included as
part of the Fixed Rent Rate.

 1.  PARTITIONS:
     -----------

      a)  Demising partitions will be constructed of 3 5/8" metal studs with
          5/8" gypsum wall board on each side.  Demising partitions will extend
          from the finish floor to the underside of the floor deck above,
          subject to the requirements of the building and air conditioning
          system and the partition will be filled with 3" of fiberglass sound
          insulation.

      b)  Interior partitions will be constructed of 3 5/8" metal studs with
          5/8" gypsum board on each side.  Partitions will extend from the floor
          to the underside of the acoustical tile ceiling.  Tenant allowance
          shall be as shown on attached Exhibit A.

2.     DOORS:
       ------

      a)  Each tenant will be allowed one entrance door of solid core oak, 3' x
          8'-4", with a door closer, lever handle mortise lock-set.  Door frame
          will be natural finish oak.

      b)  Interior doors shall be 3' x 7' solid core oak in painted metal
          frames.  Doors shall be finished natural with low sheen varnish and
          shall have 80% lever latchsets.  Tenant allowance shall be as shown on
          attached Exhibit A.

 3.  PAINTING AND WALL COVERING:
     ---------------------------

       a) All tenant partitions will receive two coats of latex paint.  Color
          selection will be made from building standard samples with not more
          than one color per room.  All partitions will have a 4" vinyl base.

       b) Wall covering will be provided at Tenant's own expense
          and shall be subject to Landlord's approval prior to
          installation.

                                      -37-
<PAGE>
 
4.    FLOORS:
      ------ 

      Carpet shall be thirty (30) ounce commercial grade installed
      from building standard samples or from Landlord approved
      selection provided by Tenant.  Vinyl tile may be substituted
      for carpet as required.

5.    CEILING:
      ------- 

      Ceilings will be 2' x 2' acoustic lay-in Armstrong Cortega
      Minaboard or equal tile.  Ceiling height will be 8'-6".

6.    ELECTRICAL:  (as shown on attached PLAN A)
      ----------                                

           Device                                     Description
           ------                                     -----------

      Lighting Fixtures                           2' x 4' Parabolic

      Wall Switches                               Single Pole

      Electrical Outlets                          120v Duplex Wall Mount

7.    TELEPHONE:
      --------- 

      Wall telephone outlets will be provided as shown on attached
      Exhibit A and will consist of a cut out in the drywall
      partition with a pull string inside the partition to above
      the ceiling.  Installation of all telephone wiring, which
      shall meet the requirements of the Massachusetts Electrical
      Code and the local building and electrical inspectors, is the
      responsibility of Tenant.

8.    SUN CONTROL BLINDS:
      ------------------ 

      a)   All windows will be 1" bronze insulated glass.

      b)   All perimeter windows will be provided with operable
           vertical Louver drape blinds in building standard color.

9.    SPRINKLERS:
      ---------- 

      General office space shall have flushed mounted sprinkler
      heads as required by local laws and ordinances.

10.  HEATING AND AIR CONDITIONING:
     -----------------------------

     Cooling shall be provided from a central mechanical plant in the penthouse
     through a medium pressure manifold variable volume duct system.  Heating
     shall be provided with constant volume fan coil units or induction units
     connected to the duct system and installed in the ceiling plenum.

                                      -38-
<PAGE>
 
     Space thermostats and separate zones will be provided for approximately
     each 50 lineal feet of building perimeter and approximately each 2,500
     square feet of interior space.

     Supply air shall be provided through linear diffusers near the windows for
     the exterior zones and through slot diffusers for interior zones.

11.  MISCELLANEOUS:
     --------------

     a)  Each floor will have a drinking fountain accessible to all tenants.

     b)  Showers will be located in the second floor Men's and Women's toilet
         facilities.

All improvements not stated above will be provided by Tenant at its own expense.
Such improvements will be approved by Landlord prior to installation.

                                      -39-
<PAGE>
 
                                   EXHIBIT D
                                   ---------

                                Somerset Court
                               281 Winter Street
                            Waltham, Massachusetts


                              LANDLORD'S SERVICES
                              -------------------


I.   CLEANING

     A.   General

     1.   All cleaning work will be performed between 8 a.m. and 12 midnight,
          Monday through Friday, unless otherwise necessary for stripping,
          waxing, etc.

     2.   Abnormal waste removal (e.g., computer installation paper, bulk
          packaging, wood or cardboard crates, refuse from cafeteria operation,
          etc.) shall be Tenant's responsibility.

     B.   Daily Operations (5 times per week)

          1.   Tenant Areas

               a.   Empty and clean all waste receptacles; wash receptacles as
                    necessary.
               b.   Vacuum all rugs and carpeted areas.
               c.   Empty, damp-wipe and dry all ashtrays.

          2.   Lavatories

               a.   Sweep and wash floors with disinfectant.
               b.   Wash both sides of toilet seats with disinfectant.
               c.   Wash all mirrors, basins, bowls, urinals.
               d.   Spot clean toilet partitions.
               e.   Empty and disinfect sanitary napkin disposal receptacles.
               f.   Refill toilet tissue, towel, soap, and sanitary napkin
                    dispensers.

          3.   Public Areas

               a.   Wipe down entrance doors and clean glass (interior and
                    exterior).
               b.   Vacuum elevator carpets and wipe down doors and walls.
               c.   Clean water coolers.

                                      -40-
<PAGE>
 
     C.   Operations as Needed (but not less than every other day)

          1.   Tenant and Public Areas

               a.   Buff all resilient floor areas.

     D.   Weekly Operations

          1.   Tenant Areas, Lavatories, Public Areas

               a.   Hand-dust and wipe clean all horizontal surfaces with
                    treated cloths to include furniture, office equipment,
                    windowsills, door ledges, chair rails, baseboards, convector
                    tops, etc., within normal reach.
               b.   Remove finger marks from private entrance doors, light
                    switches, and doorways.
               c.   Sweep all stairways.

     E.   Monthly Operations

          1.   Tenant and Public Areas

               a.   Thoroughly vacuum seat cushions on chairs, sofas, etc.
               b.   Vacuum and dust grillwork.

          2.   Lavatories

               a.   Wash down interior walls and toilet partitions.

     F.   As Required and Weather Permitting

          1.   Entire Building

               a.   Clean inside of all windows.
               b.   Clean outside of all windows.

     G.   Yearly

          1.   Tenant and Public Areas

               a.   Strip and wax all resilient tile floor areas.
               b.   Shampoo carpet in common facilities as necessary in
                    Landlord's sole discretion.

                                      -41-
<PAGE>
 
II.  HEATING, VENTILATING, AND AIR CONDITIONING

     1.   Heating, ventilating, and air conditioning as required to provide
          reasonably comfortable temperatures for normal business day occupancy
          (excepting holidays); Monday through Friday from 8:00 a.m. to 5:00
          p.m. and Saturday from 8:00 a.m. to 1:00 p.m.

     2.   Maintenance of any additional or special air conditioning equipment
          and the associated operating cost will be at Tenant's expense.

III. WATER

     Hot water for lavatory purposes and cold water for drinking, lavatory and
     toilet purposes.

IV.  ELEVATORS (if Building is Elevatored)

     Elevators for the use of all tenants and the general public for access to
     and from all floors of the Building.
     Programming of elevators (including, but not limited to, service elevators)
     shall be as Landlord from time to time determines best for the Building as
     a whole.

V.   RELAMPING OF LIGHT FIXTURES

     Tenant will reimburse Landlord for the cost of lamps, ballasts and starters
     and the cost of replacing same within the Premises.

VI.  CAFETERIA AND VENDING INSTALLATIONS

     1.   Any space to be used primarily for lunchroom or cafeteria operation
          shall be Tenant's responsibility to keep clean and sanitary, it being
          understood that Landlord's approval of such use must be first obtained
          in writing.

     2.   Vending machines or refreshment service installations by Tenant must
          be approved by Landlord in writing and shall be restricted in use to
          employees and business callers.  All cleaning necessitated by such
          installations shall be at Tenant's expense.

VII. ELECTRICITY

     A.   Landlord, at Landlord's expense, shall furnish electrical energy
          required for lighting, electrical facilities, equipment, machinery,
          fixtures, and appliances used in or for the benefit of Tenant's Space,
          in accordance with the provisions of the Lease of which this Exhibit
          is part.

                                      -42-
<PAGE>
 
     B.   Tenant shall not, without prior written notice to Landlord in each
          instance, connect to the Building electric distribution system any
          fixtures, appliances or equipment other than normal office machines
          such as desk-top calculators and typewriters, or any fixtures,
          appliances or equipment which Tenant on a regular basis operates
          beyond normal building operating hours.  In the event of any such
          connection, Tenant agrees to an increase in the ANNUAL ESTIMATED
          ELECTRICAL COST TO TENANT'S SPACE and a corresponding increase in
          Annual Rent by an amount which will reflect the cost to Landlord of
          the additional electrical service to be furnished by Landlord, such
          increase to be effective as of the date of any such installation.  If
          Landlord and cannot agree thereon, such amount shall be conclusively
          determined by a reputable independent electrical engineer or
          consulting firm to be selected by Landlord and paid equally by both
          parties, and the cost to Landlord will be included in Landlord's
          Operating Costs provided in Section 4.2 hereof.

     C.   Tenant's use of electrical energy in Tenant's Space shall not at any
          time exceed the capacity of any of the electrical conductors or
          equipment in or otherwise serving Tenant's Space.  In order to insure
          that such capacity is not exceeded and to avert possible adverse
          effect upon the Building electric service, Tenant shall not, without
          prior written notice to Landlord in each instance, connect to the
          Building electric distribution system any fixtures, appliances or
          equipment which operate on a voltage in excess of 120 volts nominal or
          make any alteration or addition to the electric system of Tenant's
          Space.  Unless Landlord shall reasonably object to the connection of
          any such fixtures, appliances or equipment, all additional risers or
          other equipment required therefor shall be provided by Landlord, and
          the cost thereof shall be paid by Tenant upon Landlord's demand.  In
          the event of any such connection, Tenant agrees to an increase in the
          ANNUAL ESTIMATED ELECTRICAL COST TO TENANT'S SPACE and a corresponding
          increase in Annual Rent by an amount which will reflect the cost to
          Landlord of the additional service to be furnished by Landlord, such
          increase to be effective as of the date of any such connection.  If
          Landlord and Tenant cannot agree thereon, such amount shall be
          conclusively determined by a reputable independent electrical engineer
          or consulting firm to be selected by Landlord and paid equally by both
          parties, and the cost to Landlord will be included in Landlord's
          Operating Costs provided in Section 4.2 hereof.

     D.   If at any time after the date of this Lease, the rates at which
          Landlord purchases electrical energy from the public utility supplying
          electric service to the Building, or any charges incurred or taxes
          payable by Landlord in connection therewith, shall be increased or
          decreased, the Annual Rent 

                                      -43-
<PAGE>
 
          and ANNUAL ESTIMATED ELECTRICAL COST TO TENANT'S SPACE shall be
          increased or decreased, as the case may be, by an amount equal to the
          estimated increase or decrease, as the case may be, in Landlord's cost
          of furnishing the electricity referred to in Paragraph A above as a
          result of such increase or decrease in rates, charges, or taxes. If
          Landlord and Tenant cannot agree thereon, such amount shall be
          conclusively determined by a reputable independent electrical engineer
          or consulting firm to be selected by Landlord and paid equally by both
          parties, and the cost to Landlord will be included in Landlord's
          Operating Costs as provided in Section 4.2 hereof. Any such increase
          or decrease shall be effective as of the date of the increase or
          decrease in such rate, charges, or taxes.

     E.   Landlord may, at any time, elect to discontinue the furnishing of
          electrical energy.  In the event of any such election by Landlord: (1)
          Landlord agrees to give reasonable advance notice of any such
          discontinuance to Tenant; (2) Landlord agrees to permit Tenant to
          receive electrical service directly from the public utility supplying
          service to the Building and to permit the existing feeders, risers,
          wiring and other electrical facilities serving Tenant's Space to be
          used by Tenant and/or such public utility for such purpose to the
          extent they are suitable and safely capable; (3)   Landlord agrees to
          pay such charges and costs, if any, as such public utility may impose
          in connection with the installation of Tenant's meters and to make or,
          at such public utility's election, to pay for such other installations
          as such public utility may require, as a condition of providing
          comparable electrical service to Tenant; (4) the Annual Rent shall be
          equitably decreased to reflect such discontinuance by an amount equal
          to the ANNUAL ESTIMATED ELECTRICAL COST TO TENANT'S SPACE then in
          effect; and (5) Tenant shall thereafter pay, directly to the utility
          furnishing the same, all charges for electrical services to the
          Premises.

     F.   Whenever the Annual Rent is increased or decreased pursuant to any of
          the foregoing paragraphs of this Article, the parties agree, upon
          request of either, to execute and deliver each to the other an
          amendment to this Lease confirming such increase or decrease.

                                      -44-
<PAGE>
 
                                   EXHIBIT E
                                   ---------

                                Somerset Court
                               281 Winter Street
                            Waltham, Massachusetts

                             RULES AND REGULATIONS
                             ---------------------


1.   The entrance, lobbies, passages, corridors, elevators and stairways shall
     not be encumbered or obstructed by Tenant, Tenant's agents, servants,
     employees, licensees or visitors or be used by them for any purpose other
     than for ingress and egress to and from the Premises.  The moving in or out
     of all sales, freight, furniture or bulky matter of any description must
     take place during the hours which Landlord may determine from time to time.
     Landlord reserves the right to inspect all freight and bulky matter to be
     brought into the Building and to exclude from the Building all freight and
     bulky matter which violates any of these Rules and Regulations or the Lease
     of which these Rules and Regulations are a part.

2.   No curtains, blinds, shades, screens or signs other than those furnished by
     Landlord shall be attached to, hung in or used in connection with any
     window or door of the Premises without the prior written consent of
     Landlord.  Interior signs on doors shall be painted or affixed for Tenant
     by Landlord or by sign painters first approved by Landlord at the expense
     of Tenant and shall be of a size, color and style acceptable to Landlord.

3.   No additional locks or bolts of any kind shall be placed upon any of the
     doors or windows by Tenant, nor shall any changes be made in existing locks
     or the mechanism thereof without the prior written consent of Landlord.
     Tenant must, upon the termination of its tenancy, restore to Landlord all
     keys of stores, shops, booths, stands, offices and toilet rooms, either
     furnished to or otherwise procured by Tenant, and in the event of the loss
     of any keys so furnished, Tenant shall pay to Landlord the cost thereof.

4.   Canvassing, soliciting and peddling in the Building are prohibited and
     Tenant shall cooperate to prevent the same.

5.   Tenant may request heating and/or air conditioning during other periods in
     addition to normal working hours by submitting its request in writing to
     the Building Manager's office not later than 2 p.m. the preceding workday
     (Monday through Friday) on forms available from the Building Manager.

     The request shall clearly state the start and stop hours of the "off-hour"
     service.  Tenant shall submit to the Building Manager a list of personnel
     who are authorized to make such requests.  Charges are to be determined by
     the Building Manager on the 

                                      -45-
<PAGE>
 
     additional hours of operations and shall be fair and reasonable and reflect
     the additional operating costs involved.

6.   Tenant shall comply with all security measures from time to time
     established by Landlord for the Building.

7.   Tenant shall be responsible for causing its visitors to park only in spaces
     or areas marked "Visitors Parking" and Tenant and its employees shall not
     park in spaces or areas marked "Visitor Parking" or "No Parking".  Landlord
     reserves the right to tow any cars parked in "Visitor Parking" or "No
     Parking" areas in violation of these rules and regulations at the sole
     expense of the owner of the improperly parked car.  Landlord reserves the
     right to designate reserved parking spaces for the Building's tenants.  If
     any parking spaces are designated as reserved for Tenant, Tenant and its
     employees shall park only in those parking spaces which have been reserved
     for Tenant and in those unmarked parking spaces which Tenant has the right
     to use in common with other tenants.  Tenant is responsible for policing
     any parking spaces reserved solely for its use and may tow any cars
     improperly parked in such reserved parking spaces.  Such towing must be
     done by a company approved by Landlord.  Tenant agrees, upon the request of
     Landlord, to provide Landlord with the license plate number and make and
     model of each of the cars which will be used by Tenant and its employees
     and shall specify which cars will be using the parking spaces reserved
     solely for Tenant's use.  Landlord is entitled to rely on the information
     provided to it by Tenant and need not make any further inquiry into the
     ownership of the cars on the Lot.  Violations of this Rule No. 7 shall be
     considered a default under the Tenant's lease and Landlord shall have all
     rights contained therein with respect to a default by Tenant.

                                      -46-
<PAGE>
 
                            FIRST AMENDMENT TO LEASE

     This First Amendment to Lease is entered into as of the 31st day of May,
1994 by and between L&E INVESTMENT OF MASSACHUSETTS ONE, INC., a Delaware
corporation (the "Landlord"), and CREDIT TECHNOLOGIES, INC., a Delaware
corporation (the "Tenant").

                                R E C I T A L S
                                - - - - - - - -

     WHEREAS, Landlord and Tenant have entered into that certain Lease dated
September 21, 1993, (the "Lease") with respect to certain premises located in
the building ("Building") known and numbered as 281 Winter Street, Waltham,
Massachusetts and more particularly described in said Lease (the "Premises");

     WHEREAS, in accordance with Section 2.5 of the Lease Landlord has offered
to lease to Tenant and Tenant has accepted from Landlord 1,809 square feet of
space on the first floor of the Building, all as more fully set forth herein;
and

     WHEREAS, Landlord and Tenant therefore wish to amend the Lease in order to
reflect such expansion, subject to the terms and conditions set forth below;

     NOW, THEREFORE, for good and valuable consideration the receipt and
sufficiency of which are hereby acknowledged, Landlord and Tenant hereby agree
as follows:

     1.   All capitalized terms used herein and not otherwise defined shall have
the meaning ascribed to such term in the Lease.

     2.   Effective as of August 1, 1994 the parties agree that 1,809 square
feet of adjacent space on the first floor of the Building (the "Expansion
Space") shall be added to the Premises and the definition of the term "TENANT'S
SPACE" set forth in Section 1.1 of the Lease shall be and hereby is amended by
deleting the first floor space plan attached as Exhibit A1 to the Lease and
substituting therefore the first floor space plan attached as Exhibit A1 to this
Amendment.  Thereafter, all references to "Premises" or "Tenant's Space"
contained in the Lease shall be read to refer to the original 17,580 square feet
together with the Expansion Space being added by this Amendment and the terms
and provisions of the Lease, as the same may be amended hereby, shall apply to
said Expansion Space as fully as if it had been included in the Premises
originally demised, including without limitation those terms relating the
payment of fixed and additional rent.

     3.   Effective as of August 1, 1994 the definition of the term "RENTABLE
FLOOR AREA OF TENANT'S SPACE" set forth in Section 1.1 of the Lease is hereby
deleted and the following is substituted therefore:

                                      -47-
<PAGE>
 
          "RENTABLE FLOOR AREA OF TENANT'S SPACE: 19,389 square feet (14,691 of
          which are on the first floor and 4,698 of which are on the second
          floor), as the same may be increased pursuant to the terms hereof."

     4.   Effective as of August 1, 1994 the definition of the term "TENANT'S
PROPORTIONATE SHARE" set forth in Section 1.1 of the lease is hereby amended by
deleting the phrase "25.93%  (17,580 square feet divided by 67,800 square feet)"
and substituting "28.60% (19,389 square feet divided by 67,800 square feet)"
therefor.

     5.   Effective as of August 1, 1994 the definition of "PARKING SPACES
ALLOCATED TO TENANT" set forth in Section 1.1 of the Lease is hereby amended by
deleting the phrase "Approximately 70 parking spaces" and substituting
"Approximately 78 parking spaces" therefor.

     6.   Landlord hereby agrees that on or before August 1, 1994 it will remove
the existing demising wall separating the Expansion Space from the original
17,580 square feet premises, and Landlord agrees to use diligent efforts to
ensure that Tenant's use of the Premises is no unreasonably disrupted by such
demolition.  Landlord further agrees that it will patch and paint the walls of
the Expansion Space in accordance with building standards.

     7.   Tenant represents and warrants that it has dealt with no broker in
connection with this Amendment other than Meredith & Grew, Incorporated and
agrees to defend, with counsel approved by Landlord, indemnify and save Landlord
harmless from and against any and all cost, expense or liability for any
compensation, commissions or charges claimed by a broker or agent, other than
with Meredith & Grew, Incorporated, with respect to Tenant's dealings in
connection with this Amendment.

     8.   The terms and provisions of the Lease, as modified by this Amendment,
are hereby ratified and confirmed and the parties agree that said Lease, as so
modified, remains in full force and effect.

                                      -48-
<PAGE>
 
     EXECUTED under seal this as of the date first above written.

                              LANDLORD:

                              L&E INVESTMENT OF MASSACHUSETTS
                              ONE, INC.


                              By: /s/ David C. Sherwood
                                  -----------------------------
                                  Name: David C. Sherwood
                                  Its:  CEO

                              TENANT:

                              CREDIT TECHNOLOGIES, INC.


                              By: /s/ William G. Brown
                                  -----------------------------
                                  Name: William G. Brown
                                  Its:  Vice President - Finance

                                      -49-
<PAGE>
 
                           SECOND AMENDMENT TO LEASE

This Second Amendment to Lease is entered into as of the 5th day of August, 1994
by and between L&E INVESTMENT OF MASSACHUSETTS ONE, INC., a Delaware corporation
(the "Landlord"), and CREDIT TECHNOLOGIES, INC., a Delaware corporation (the
"Tenant").

                                R E C I T A L S
                                - - - - - - - - 

     WHEREAS, Landlord and Tenant have entered into that certain Lease dated
September 21, 1993, as amended by a First Amendment to Lease dated as of May 31,
1994 (as so amended, the with respect to certain premises located in the
building ("Building") known and numbered as 281 Winter Street, Waltham,
Massachusetts and more particularly described in said Lease (the "Premises").

     WHEREAS, Landlord and Tenant have, on or about the date hereof, entered
into a second lease of space with respect to 12,046 square feet of space in the
Building (the "Second Lease"); and

     WHEREAS, Landlord and Tenant wish to amend the Lease as set forth below to
provide that a default by Tenant under the Second Lease shall likewise
constitute a default under the Lease;

     NOW, THEREFORE, for good and valuable consideration the receipt and
sufficiency of which are hereby acknowledged, Landlord and Tenant hereby agree
as follows:

     1.   All capitalized terms used herein and not otherwise defined shall have
the meaning ascribed to such term in the Lease.  The term "Second Lease" shall
have the meaning set forth above.

     2.     Section 9.1 of the Lease is hereby amended by inserting the
following language immediately after the word "default;" in the seventh (7th)
line thereof: "or if Tenant is in default (beyond any applicable grace periods)
under the Second Lease;", it being the intention of the parties that a default
under the Second Lease likewise constitute a default under this Lease.

     3.   The terms and provisions of the Lease, as modified by this Amendment,
are hereby ratified and confirmed and the parties agree that said Lease, as so
modified, remains in full force and effect.

                                      -50-
<PAGE>
 
EXECUTED under seal this as of the date first above written.

                              LANDLORD:

                              L&E INVESTMENT OF
                              MASSACHUSETTS ONE, INC.


                              By:/s/ David C. Sherwood
                                 ---------------------
                                    Name: David C. Sherwood
                                    Its:  CEO

                              TENANT:

                              CREDIT TECHNOLOGIES, INC.


                              By:/s/ William G. Brown
                                 --------------------
                                    Name: William G. Brown
                                    Title: Treasurer, VP Finance and
                                    Administration

                                      -51-
<PAGE>
 
                            THIRD AMENDMENT TO LEASE


     This Third Amendment to Lease is entered into as of the 29th day of
November, 1994 by and between L & E INVESTMENT OF MASSACHUSETTS ONE, INC., a
Delaware corporation (the "Landlord"), and LIGHTBRIDGE, INC., a Delaware
corporation (the "Tenant").

                                R E C I T A L S
                                - - - - - - - - 

     WHEREAS, Landlord and Credit Technologies, Inc. entered into that certain
Lease dated September 21, 1993, as amended by a First Amendment to Lease dated
as of May 31, 1994 and a Second Amendment to Lease dated as of August 5, 1994
(as so amended, the "Lease") with respect to certain premises located in the
building ("Building") known and numbered as 281 Winter Street, Waltham,
Massachusetts and more particularly described in said Lease (the "Premises");

     WHEREAS, Credit Technologies, Inc. has since changed its name to and
reincorporated as Lightbridge, Inc.;

     WHEREAS, in accordance with Section 2.5 of the Lease Landlord has offered
to lease to Tenant and Tenant has accepted from Landlord 1,775 square feet of
space formerly occupied by Intersel, Inc. and located on the first floor of the
Building, all as more fully set forth herein; and

     WHEREAS, Landlord and Tenant therefore wish to amend the Lease in order to
reflect such expansion, subject to the terms and conditions set forth below;

     NOW, THEREFORE, for good and valuable consideration the receipt and
sufficiency of which are hereby acknowledged, Landlord and Tenant hereby agree
as follows:

     1.   All capitalized terms used herein and not otherwise defined shall have
the meaning ascribed to such term in the Lease.

     2.   Tenant hereby warrants and represents that, but for the name change,
Lightbridge, Inc. is the same corporate entity formerly known as Credit
Technologies, Inc. and that the assets and net worth of said corporation were
not affected by such name change or any transaction(s) relating thereto.  The
parties hereby agree that all references to "Tenant" in the Lease and herein
shall refer to Lightbridge, Inc. and, accordingly, the definition of "TENANT" in
Section 1.1 of the Lease is hereby amended by deleting "Credit Technologies,
Inc." and substituting "Lightbridge, Inc." therefor.

     3.   Effective as of December 15, 1994 the parties agree that 1,775 square
feet of space formerly occupied by Intersel, Inc. and located on the first floor
of the Building and more particularly shown on the floor plan attached hereto as
Exhibit A (the "Additional Expansion Space") 
- ---------

                                      -1-
<PAGE>
 
shall be added to the Premises and the definition of the term "TENANT'S SPACE"
set forth in Section 1.1 of the Lease shall be and hereby is amended by adding
to and incorporating into the floor space plan attached as Exhibit Al to the
Lease the floor space plan attached as Exhibit A to this Amendment. Thereafter,
                                       ---------   
all references to "Premises" or "Tenant's Space" contained in the Lease shall be
read to refer to the original 17,580 square feet of space, the 1,809 square feet
of Expansion Space added by the above-referenced First Amendment and the
Additional Expansion Space being added by this Amendment, and the terms and
provisions of the Lease, as the same may be amended hereby, shall apply to said
Additional Expansion Space as fully as if it had been included in the Premises
originally demised, including without limitation those terms relating to the
payment of fixed and additional rent.

     4.   Effective as of December 15, 1994 the definition of the term "RENTABLE
FLOOR AREA OF TENANT'S SPACE" set forth in Section 1.1 of the Lease is hereby
deleted and the following is substituted therefore:

          "RENTABLE FLOOR AREA OF TENANT'S SPACE:
          21,164 square feet (16,466 of which are on the first floor and 4,698
          of which are on the second floor), as the same may be increased
          pursuant to the terms hereof."

     5.   Effective as of December 15, 1994 the definition of the term "TENANT'S
PROPORTIONATE SHARE" set forth in Section 1.1 of the Lease is hereby amended by
deleting the phrase "28.60% (19,389 square feet divided by 67,800 square feet)"
and substituting "131.22% (21,164 square feet divided by 67,800 square feet)"
therefor.

     6.   Effective as of December 15, 1994 the definition of "PARKING SPACES
ALLOCATED TO TENANT" set forth in Section 1.1 of the Lease is hereby amended by
deleting the phrase "Approximately 78 parking spaces" and substituting
"Approximately 85 parking spaces" therefor.

     7.   Tenant represents and warrants that it has dealt with no broker in
connection with this Amendment other than Meredith & Grew, Incorporated and
agrees to defend, with counsel approved by Landlord, indemnify and save Landlord
harmless from and against any and all cost, expense or liability for any
compensation, commissions or charges claimed by a broker or agent, other than
with Meredith & Grew, Incorporated, with respect to Tenant's dealings in
connection with this Amendment.

     8.   The terms and provisions of the Lease, as modified by this Amendment,
are hereby ratified and confirmed and the parties agree that said Lease, as so
modified, remains in full force and effect.


                                      -2-
<PAGE>
 
     EXECUTED under seal this as of the date first above written.

                              LANDLORD:

                              L&E INVESTMENT OF
                              MASSACHUSETTS ONE, INC.


                              By:/s/ David C. Sherwood
                                 ---------------------
                                   Name:David C. Sherwood
                                   Its: CEO

                              TENANT:

                              LIGHTBRIDGE, INC.


                              By:/s/ William G. Brown
                                 --------------------
                                    Name: William G. Brown
                                    Title: Treasurer/VP - Finance


                                      -3-
<PAGE>
 
                                   EXHIBIT A


                [Plan of 1,775 s.f. Additional Expansion Space]
<PAGE>
 
                            THIRD AMENDMENT TO LEASE


     This Third Amendment to Lease is entered into as of the 29th day of
November, 1994 by and between L & E INVESTMENT OF MASSACHUSETTS ONE, INC., a
Delaware corporation (the "Landlord"), and LIGHTBRIDGE, INC., a Delaware
corporation (the "Tenant").

                                R E C I T A L S
                                - - - - - - - - 

     WHEREAS, Landlord and Credit Technologies, Inc. entered into that certain
Lease dated September 21, 1993, as amended by a First Amendment to Lease dated
as of May 31, 1994 and a Second Amendment to Lease dated as of August 5, 1994
(as so amended, the "Lease") with respect to certain premises located in the
building ("Building") known and numbered as 281 Winter Street, Waltham,
Massachusetts and more particularly described in said Lease (the "Premises");

     WHEREAS, Credit Technologies, Inc. has since changed its name to and
reincorporated as Lightbridge, Inc.;

     WHEREAS, in accordance with Section 2.5 of the Lease Landlord has offered
to lease to Tenant and Tenant has accepted from Landlord 1,775 square feet of
space formerly occupied by Intersel, Inc. and located on the first floor of the
Building, all as more fully set forth herein; and

     WHEREAS, Landlord and Tenant therefore wish to amend the Lease in order to
reflect such expansion, subject to the terms and conditions set forth below;

     NOW, THEREFORE, for good and valuable consideration the receipt and
sufficiency of which are hereby acknowledged, Landlord and Tenant hereby agree
as follows:

     1.   All capitalized terms used herein and not otherwise defined shall have
the meaning ascribed to such term in the Lease.

     2.   Tenant hereby warrants and represents that, but for the name change,
Lightbridge, Inc. is the same corporate entity formerly known as Credit
Technologies, Inc. and that the assets and net worth of said corporation were
not affected by such name change or any transaction(s) relating thereto.  The
parties hereby agree that all references to "Tenant" in the Lease and herein
shall refer to Lightbridge, Inc. and, accordingly, the definition of "TENANT" in
Section 1.1 of the Lease is hereby amended by deleting "Credit Technologies,
Inc." and substituting "Lightbridge, Inc." therefor.

     3.   Effective as of December 15, 1994 the parties agree that 1,775 square
feet of space formerly occupied by Intersel, Inc. and located on the first floor
of the Building and more particularly shown on the floor plan attached hereto as
Exhibit A (the "Additional Expansion Space") shall be added to the Premises and
- ---------                                                                      
the definition of the term "TENANT'S SPACE" set forth in Section 1.1 of the
Lease shall be and hereby is amended by adding to and incorporating into the
floor space plan 
<PAGE>
 
attached as Exhibit Al to the Lease the floor space plan attached as Exhibit A
                                                                     ---------
to this Amendment. Thereafter, all references to "Premises" or "Tenant's Space"
contained in the Lease shall be read to refer to the original 17,580 square feet
of space, the 1,809 square feet of Expansion Space added by the above-referenced
First Amendment and the Additional Expansion Space being added by this
Amendment, and the terms and provisions of the Lease, as the same may be amended
hereby, shall apply to said Additional Expansion Space as fully as if it had
been included in the Premises originally demised, including without limitation
those terms relating to the payment of fixed and additional rent.

     4.   Effective as of December 15, 1994 the definition of the term "RENTABLE
FLOOR AREA OF TENANT'S SPACE" set forth in Section 1.1 of the Lease is hereby
deleted and the following is substituted therefore:

          "RENTABLE FLOOR AREA OF TENANT'S SPACE:
          21,164 square feet (16,466 of which are on the first floor and 4,698
          of which are on the second floor), as the same may be increased
          pursuant to the terms hereof."

     5.   Effective as of December 15, 1994 the definition of the term "TENANT'S
PROPORTIONATE SHARE" set forth in Section 1.1 of the Lease is hereby amended by
deleting the phrase "28.60% (19,389 square feet divided by 67,800 square feet)"
and substituting "31.22% (21,164 square feet divided by 67,800 square feet)"
therefor.

     6.   Effective as of December 15, 1994 the definition of "PARKING SPACES
ALLOCATED TO TENANT" set forth in Section 1.1 of the Lease is hereby amended by
deleting the phrase "Approximately 78 parking spaces" and substituting
"Approximately 85 parking spaces" therefor.

     7.   Tenant represents and warrants that it has dealt with no broker in
connection with this Amendment other than Meredith & Grew, Incorporated and
agrees to defend, with counsel approved by Landlord, indemnify and save Landlord
harmless from and against any and all cost, expense or liability for any
compensation, commissions or charges claimed by a broker or agent, other than
with Meredith & Grew, Incorporated, with respect to Tenant's dealings in
connection with this Amendment.

     8.   The terms and provisions of the Lease, as modified by this Amendment,
are hereby ratified and confirmed and the parties agree that said Lease, as so
modified, remains in full force and effect.


                                      -2-
<PAGE>
 
     EXECUTED under seal this as of the date first above written.

                              LANDLORD:

                              L&E INVESTMENT OF
                              MASSACHUSETTS ONE, INC.


                              By:/s/ David C. Sherwood
                                 ---------------------
                                 Name: David C. Sherwood
                                 Its: CEO

                              TENANT:

                              LIGHTBRIDGE, INC.


                              By:/s/ William G. Brown
                                 --------------------
                                 Name: William G. Brown
                                 Title: Treasurer/VP Finance


                                      -3-
<PAGE>
 
                                   EXHIBIT A


                [Plan of 1,775 s.f. Additional Expansion Space]
<PAGE>
 
                           FOURTH AMENDMENT TO LEASE


     This Fourth Amendment to Lease is entered into as of the first day of
January, 1996 (the "Effective Date") by and between L & E INVESTMENT OF
MASSACHUSETTS ONE, INC., a Delaware corporation (the "Landlord"), and
LIGHTBRIDGE, INC., a Delaware corporation, formerly known as Credit
Technologies, Inc. (the "Tenant").

                                R E C I T A L S
                                - - - - - - - - 

     WHEREAS, Landlord and Tenant entered into that certain Lease dated
September 21, 1993, as amended by a First Amendment to Lease dated as of May 31,
1994, a Second Amendment to Lease dated as of August 5, 1994 and a Third
Amendment to Lease dated as of November 29, 1995 (as so amended, the "Lease")
with respect to certain premises located in the building ("Building") known and
numbered as 281 Winter Street, Waltham, Massachusetts and more particularly
described in said Lease (the "Premises"); and

     WHEREAS, Landlord and Tenant wish to amend the Lease on the terms and
conditions set forth below;

     NOW, THEREFORE, for good and valuable consideration the receipt and
sufficiency of which are hereby acknowledged, Landlord and Tenant hereby agree
as follows:

     1.   All capitalized terms used herein and not otherwise defined shall have
the meaning ascribed to such term in the Lease.

     2.   As of the Effective Date the parties agree that 4,352 square feet of
space located on the first floor of the Building and more particularly shown on
the floor plan attached hereto as Exhibit A (the "Additional Expansion Space")
                                  ---------                                   
shall be added to the Premises and the definition of the term "TENANT'S SPACE"
set forth in Section 1.1 of the Lease shall be and hereby is amended by adding
to and incorporating into the floor space plan attached as Exhibit Al to the
Lease the floor space plan attached as Exhibit A to this Amendment.  Thereafter,
                                       ---------                                
all references to "Premises" or "Tenant's Space" contained in the Lease shall be
read to refer to the original 17,580 square feet of space, the 1,809 square feet
of space added by the above-referenced First Amendment, the 1,775 square feet of
space added by the above referenced Third Amendment (the "Third Amendment
Space") and the Additional Expansion Space being added by this Amendment, and
the terms and provisions of the Lease, as the same may be amended hereby, shall
apply to said Additional Expansion Space as fully as if it had been included in
the Premises originally demised, including without limitation those terms
relating to the payment of fixed and additional rent.

     3.   As of the Effective Date, the definition of the term "RENTABLE FLOOR
AREA OF TENANT'S SPACE" set forth in Section 1.1 of the Lease is hereby deleted
and the following is substituted therefore:

          "RENTABLE FLOOR AREA OF TENANT'S SPACE:
<PAGE>
 
          25,516 square feet (20,818 of which are on the first floor and 4,698
          of which are on the second floor), as the same may be decreased
          pursuant to the terms hereof."

     4.   As of the Effective Date, the definition of the term "TENANT'S
PROPORTIONATE SHARE" set forth in Section 1.1 of the Lease is hereby amended by
deleting the phrase "31.22% (21,164 square feet divided by 67,800 square feet)"
and substituting "37.63% (25,516 square feet divided by 67,800 square feet")
therefor.

     5.   As of the Effective Date, the definition of "PARKING SPACES ALLOCATED
TO TENANT" set forth in Section 1.1 of the Lease is hereby amended by deleting
the phrase "Approximately 85 parking spaces" and substituting "Approximately 102
parking spaces" therefor.

     6.   Section 2.5 of the Lease is hereby deleted.

     7.   Notwithstanding any provision of the Lease to the contrary, the Term
of the Lease with respect to the Third Amendment Space (and, at the option of
the Landlord as hereinafter set forth, with respect to the Additional Expiration
Space, as hereinafter defined) shall, at the option of Landlord be caused to
expire on the following terms and conditions.

          Landlord may elect at any time, by written notice to Tenant (an
     "Expiration Election") to cause the Lease to expire with respect to the
     Third Amendment Space, and if Landlord shall simultaneously so elect up to
     three hundred square feet of contiguous space within the Premises (the
     "Additional Expiration Space"), all of such space so elected being
     hereinafter referred to as the "Expiration Space".

          Upon the exercise of an Expiration Election, the Term of the Lease
     with respect to the Expiration Space shall expire effective as of 12:00
     midnight on the day five days after delivery of such Expiration Election to
     Tenant as though such date were the date specified for the expiration of
     the Term with respect to such Expiration Space originally provided in the
     Lease.  Tenant shall yield up such Expiration Space upon such expiration in
     the condition required pursuant to the Lease.

          Upon the expiration of the Term of the Lease with respect to The
     Expiration Space pursuant to the terms of this Section, (i) the Rentable
     Floor Area of Tenant's Space shall be adjusted by deducting therefrom the
     rentable floor area of said Expiration Space, (ii) Exhibit Al of the Lease
     shall be amended by deleting therefrom the space constituting the
     Expiration Space, (iii) Tenant's Proportionate Share shall be adjusted by
     reducing the numerator used in calculating the same by the rentable floor
     area of the Expiration Space, and (iv) the Parking Spaces Allocated to
     Tenant shall be reduced by the smallest whole number greater than or equal
     to the 

                                      -2-
<PAGE>
 
     product of .004 and the rentable floor area of the Expiration Space, such
     adjustments and deletions being deemed to have occurred automatically,
     without the need for further action by Landlord or Tenant.

          In the event that Landlord does not deliver an Expiration Election to
     Tenant on or before September 25, 1996 then, as of 12:00 midnight,
     September 30, 1996, the Term of the Lease shall be deemed to have expired
     with respect to the Third Amendment Space as if Landlord had, in a timely
     manner, elected to so cause the Term to expire with respect to such space
     pursuant to the terms of this Section, including, without limitation, the
     adjustments to be made pursuant to the preceding paragraph.

     8.   Notwithstanding anything to the contrary in the Lease or in this
Amendment, Tenant shall not be responsible for the payment of Annual Rent,
Operating Cost Escalation or Tax Escalation allocable to the Additional
Expansion Space for the period between the Effective Date and September 30,
1996.

     9.   Notwithstanding anything in the Lease to the contrary (including,
without limitation, the expiration of the Term with respect to the remainder of
the Premises), the Term of the Lease with respect to the Additional Expansion
Space shall be for the period commencing January 1, 1996 and expiring November
30, 2001.

     10.  Tenant represents and warrants that it has dealt with no broker in
connection with this Amendment other than Meredith & Grew, Incorporated (the
"Broker") and agrees to defend, with counsel approved by Landlord, indemnify and
save Landlord harmless from and against any and all cost, expense or liability
for any compensation, commissions or charges claimed by a broker or a agent
other than with Meredith & Grew, Incorporated, with respect to Tenant's dealings
in connection with this Amendment.  Landlord shall be responsible for the
payment to Broker of any commission due and payable pursuant to this Amendment.

     11.  The terms and provisions of the Lease, as modified by this Amendment,
are hereby ratified and confirmed and the parties agree that said Lease, as so
modified, remains in full force and effect.


                                      -3-
<PAGE>
 
     EXECUTED under seal this as of the date first above written.

                              LANDLORD:

                              L&E INVESTMENT OF
                              MASSACHUSETTS ONE, INC.


                              By:/s/ David C. Sherwood
                                 ---------------------
                                 Name: David C. Sherwood
                                 Its: CEO

                              TENANT:

                              LIGHTBRIDGE, INC.


                              By:/s/ William G. Brown
                                 --------------------
                                 Name: William G. Brown
                                 Title: VP


                                      -4-
<PAGE>
 
                                   EXHIBIT A

                         [Exhibit begins on next page]
<PAGE>
 
                           [Floor Plan - Ground Floor
                           Rentable Square Footages]
<PAGE>
 
                            FIFTH AMENDMENT TO LEASE


     This Fifth Amendment to Lease is entered into as of the 22nd day of April,
1996 (the "Effective Date") by and between L & E INVESTMENT OF MASSACHUSETTS
ONE, INC., a Delaware corporation (the "Landlord"), and LIGHTBRIDGE, INC., a
Delaware corporation, formerly known as Credit Technologies, Inc. (the
"Tenant").

                                R E C I T A L S
                                - - - - - - - - 

     WHEREAS, Landlord and Tenant entered into that certain Lease dated
September 21, 1993, as amended by a First Amendment to Lease dated as of May 31,
1994, a Second Amendment to Lease dated as of August 5, 1994, a Third Amendment
to Lease (the "Third Amendment") dated as of November 29, 1995 and a Fourth
Amendment to Lease (the "Fourth Amendment") dated January 1, 1996 (as so
amended, the "Lease") with respect to certain premises located in the building
("Building") known and numbered as 281 Winter Street, Waltham, Massachusetts and
more particularly described in said Lease (the "Premises"); and

     WHEREAS, Landlord and Tenant wish to amend the Lease on the terms and
conditions set forth below;

     NOW, THEREFORE, for good and valuable consideration the receipt and
sufficiency of which are hereby acknowledged, Landlord and Tenant hereby agree
as follows:

     1.   All capitalized terms used herein and not otherwise defined shall have
the meaning ascribed to such term in the Lease.

     2.   As of the Effective Date the parties agree that the Additional
Expansion Space (as defined in the Fourth Amendment) shall be the 2,584 rentable
square feet shown on the Floor Plan attached hereto as Exhibit A and that the
Third Amendment Space is no longer subject to the Lease.  Thereafter, all
references to "Premises" or "Tenant's Space" contained in the Lease shall be
read to refer to the original 17,580 square feet of space, the 1,809 square feet
of space added by the above-referenced First Amendment and the Additional
Expansion Space as redefined above, and the terms and provisions of the Lease,
as the same may be amended hereby, shall apply to all of said space.

     3.   As of the Effective Date, the definition of the term "RENTABLE FLOOR
AREA OF TENANT'S SPACE" set forth in Section 1.1 of the Lease is hereby deleted
and the following is substituted therefore:

          "RENTABLE FLOOR AREA OF TENANT'S SPACE:
          21,973 square feet (17,275 of which are on the first floor and 4,698
          of which are on the second floor)."

     4.   As of the Effective Date, the definition of the term "TENANT'S
PROPORTIONATE SHARE" set forth in Section 1.1 of the Lease is hereby amended by
deleting the phrase "37.63% (25,516 square feet divided by 
<PAGE>
 
67,800 square feet") and substituting "32.41% (21,973 square feet divided by
67,800 square feet)" therefor.

     5.   As of the Effective Date, the definition of "PARKING SPACES ALLOCATED
TO TENANT" set forth in Section 1.1 of the Lease is hereby amended by deleting
the phrase "Approximately 102 parking spaces" and substituting "Approximately 88
parking spaces" therefor.

     6.   The terms and provisions of the Lease, as modified by this Amendment,
are hereby ratified and confirmed and the parties agree that said Lease, as so
modified, remains in full force and effect.

     EXECUTED under seal this as of the date first above written.

                              LANDLORD:

                              L&E INVESTMENT OF
                              MASSACHUSETTS ONE, INC.


                              By:/s/ David C. Sherwood
                                 ---------------------
                                 Name: David C. Sherwood
                                 Its: CEO

                              TENANT:

                              LIGHTBRIDGE, INC.


                              By:/s/ William G. Brown
                                 --------------------
                                 Name: William G. Brown
                                 Title: CFO/Vice President - Finance
                                          and Administration
                              

                                      -2-
<PAGE>
 
                                   EXHIBIT A


                         [Exhibit begins on next page.]




                                      -1-
<PAGE>
 
                           [Floor Plan - First Floor
                          2,584 Rentable Square Feet]




                                      -2-

<PAGE>
 
                                                                   Exhibit 10.13


                               LIGHTBRIDGE, INC.
                               281 Winter Street
                          Waltham, Massachusetts 02154


                                           August 26, 1996



Mr. Brian E. Boyle
31 Hallett Hill Road
Weston, Massachusetts 02193

Dear Mr. Boyle:

     This letter sets forth the agreement between you and Lightbridge, Inc.
("Lightbridge") regarding the matters listed below.

     1.  (a)  In the event that Lightbridge effects an initial public offering
(the "IPO") of its common stock, $.01 par value per share (the "Common Stock"),
you, your wife and Boyle Corp. (collectively, the "Boyle Parties") will sell an
aggregate of 778,132 shares of Common Stock on a firm basis in the IPO.  If,
however, the per share price at which the Common Stock is offered to the public
in the IPO (the "IPO Price") is less than $6.80, the Boyle Parties will have the
right to sell any smaller number shares, or no shares.

     (b)  On the date hereof, each of the Boyle Parties shall execute, enter
into and deliver the following documents:  (i) a 180 day lock-up agreement, in
the form attached hereto as Exhibit A, (ii) a Selling Stockholder's Irrevocable
                            ---------                                          
Power of Attorney, in the form attached hereto as Exhibit B, (iii) a Letter of
                                                  ---------                   
Transmittal and Custody Agreement, in the form attached hereto as Exhibit C and
                                                                  ---------    
(iv) a letter agreement regarding the power of attorney in the form attached
hereto as Exhibit D.  In the event that Lightbridge withdraws its registration
          ---------                                                           
statement on Form S-1 (SEC File No. 333-6589) prior to its effectiveness, the
Boyle Parties shall, upon the written request of Lightbridge following its
filing of a new registration statement with respect to an IPO, enter into and
deliver documents containing terms and conditions equivalent to those contained
in the agreements referred to in the preceding sentence, provided that such
filing occurs prior to October 1, 1998.

     (c)   (I)  Lightbridge hereby agrees that, in the event of an IPO, it will
indemnify and hold harmless each of the Boyle Parties that is a selling
stockholder, each underwriter of such IPO and each other person, if any, who
controls such seller or underwriter within the meaning of the Securities Act of
1933, as amended (the "Securities Act"), against any losses, claims, damages or
liabilities, joint or several, to which such seller, underwriter or controlling
person may become subject under the Securities Act or otherwise, insofar as such
losses, claims, damages or liabilities (or actions in respect thereof) 
<PAGE>
 
arise out of or are based upon any untrue statement or alleged untrue statement
of any material fact contained in any registration statement relating to such
IPO, any preliminary prospectus or final prospectus contained therein, or any
amendment or supplement thereof, or arise out of or are based upon the omission
or alleged omission to state therein 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, and will reimburse each
such seller, each such underwriter and each such controlling person for any
legal or other expenses reasonably incurred by them in connection with
investigating or defending any such loss, claim, damage, liability or action,
provided, however, that Lightbridge will not be liable in any such case
- -------- 
if and to the extent that any such loss, claim, damage or liability arises out
of or is based upon an untrue statement or alleged untrue statement or omission
or alleged omission so made in conformity with information furnished by any such
seller, any such underwriter or any such controlling person in writing
specifically for use in such registration statement or prospectus.

     (II)  Promptly after receipt by an indemnified party hereunder of notice of
the commencement of any action, such indemnified party shall, if a claim in
respect thereof is to be made against the indemnifying party hereunder, notify
the indemnifying party in writing thereof, but the omission so to notify the
indemnifying party shall not relieve it from any liability which it may have to
such indemnified party other than under this Section 1(c) and shall only relieve
it from any liability which it may have to such indemnified party under this
Section 1(c) if and to the extent the indemnifying party is prejudiced by such
omission.  In case any such action shall be brought against any indemnified
party and it shall notify the indemnifying party of the commencement thereof,
the indemnifying party shall be entitled to participate in and, to the extent it
shall wish, to assume and undertake the defense thereof with counsel
satisfactory to such indemnified party, and, after notice from the indemnifying
party to such indemnified party of its election so to assume and undertake the
defense thereof, the indemnifying party shall not be liable to such indemnified
party under this Section 1(c) for any legal expenses subsequently incurred by
such indemnified party in connection with the defense thereof other than
reasonable costs of investigation and of liaison with counsel so selected,
provided, however, that, if the defendants in any such action include both the
indemnified party and the indemnifying party and the indemnified party shall
have reasonably concluded that there may be reasonable defenses available to it
which are different from or in addition to those available to the indemnifying
party or if the interests of the indemnified party reasonably may be deemed to
conflict with the interests of the indemnifying party, the indemnified party
shall have the right to select a single separate counsel and to assume such
legal defenses and otherwise to participate in the defense of such action, with
the reasonable expenses and fees of such separate counsel and other reasonable
expenses related to such participation to be reimbursed by the indemnifying
party as incurred.
<PAGE>
 
     (III)  In order to provide for just and equitable contribution to joint
liability under the Securities Act in any case in which either (i) any of the
Boyle Parties selling shares in an IPO, or any controlling person of any such
party, makes a claim for indemnification pursuant to this Section 1(c) but it is
judicially determined (by the entry of a final judgment or decree by a court of
competent jurisdiction and the expiration of time to appeal or the denial of the
last right of appeal) that such indemnification may not be enforced in such case
notwithstanding the fact that this Section 1(c) provides for indemnification in
such case, or (ii) contribution under the Securities Act may be required on the
part of any such selling party or any such controlling person in circumstances
for which indemnification is provided under this Section 1(c); then, and in each
such case, Lightbridge and such party will contribute to the aggregate losses,
claims, damages or liabilities to which they may be subject (after contribution
from others) in such proportion so that such party is responsible for the
portion represented by the percentage that the IPO price of its shares of Common
Stock offered by the registration statement bears to the public offering price
of all securities offered by such registration statement, and Lightbridge is
responsible for the remaining portion; provided, however, that, in any such
case, (A) no such party will be required to contribute any amount in excess of
the public offering price of all such Common Stock offered by it pursuant to
such registration statement; and (B) no person or entity guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act)
will be entitled to contribution from any person or entity who was not guilty of
such fraudulent misrepresentation.

     (d)  Lightbridge may, in its discretion, obtain, prior to the date of the
IPO, a directors' and officers' insurance policy that covers liabilities
associated with the IPO, which policy includes a rider providing that you, in
your capacity as a selling stockholder, shall be an additional insured.  Such
policy shall be written by National Union or another insurer reasonably
acceptable to you, and shall provide for at least $10 million in coverage.  If
Lightbridge does not obtain a directors' and officers' insurance policy that
meets the foregoing requirements, then, in the event of any action pursuant to
which the Boyle Parties are entitled to indemnification pursuant to Section 1(c)
(and notwithstanding the provisions of paragraph (II) of Section 1(c)), such
parties shall have the right to select a single separate counsel to represent
them in such action, with the reasonable expenses and fees of such separate
counsel to be reimbursed by Lightbridge as incurred.

    2.  Upon execution of this Agreement, you shall deliver a lock-up agreement,
in the form attached hereto as Exhibit A, executed by the Sheng Ren Trust.
                               ---------                                  

    3.  Upon the closing of an IPO, Lightbridge shall exercise all stock options
granted to it by you pursuant to that certain Settlement Agreement dated
February 2, 1996 among you, Lightbridge and certain other parties (the
"Settlement Agreement") which remain unexercised 
<PAGE>
 
on such date, and shall pay the exercise price therefor by wire transfer. In
addition, upon such closing, Lightbridge shall pay all principal and interest
outstanding under any promissory notes issued by Lightbridge in connection with
the exercise of such stock options prior to such closing.

    4.  Upon your execution of this letter, Lightbridge shall execute and
deliver to the Sheng Ren Trust a Common Stock Purchase Warrant in the form
attached hereto as Exhibit E and shall pay you the sum of $75,000 by wire
                   ---------                                             
transfer.

    5.  Upon your execution of this letter, you and Lightbridge shall execute
and enter into a Registration Rights Agreement in the form attached hereto as
Exhibit F.
- --------- 

    6.  You, Lightbridge and the other parties executing this letter hereby re-
affirm and ratify, through and as of the date hereof, all of the terms and
conditions of that certain Mutual General Release executed and delivered by you,
Lightbridge and certain other parties pursuant to the terms of the Settlement
Agreement.

    7.  You hereby consent to the filing of the Settlement Agreement as an
exhibit to Lightbridge's registration statement on Form S-1.

     This letter, together with the agreements referred to herein, sets forth
the entire agreement of the parties with respect to the subject matter hereof
and supersedes all prior agreements or understandings, written or oral, with
respect to such subject matter.  This letter agreement shall be governed by, and
construed and enforced in accordance with, the substantive laws of The
Commonwealth of Massachusetts, without regard to its principles of conflict of
laws.

     Please indicate your acceptance of the foregoing by signing and returning
the enclosed counterpart of this letter, whereupon this letter shall be a
binding agreement between Lightbridge and you.


                                             Very truly yours,

                                             LIGHTBRIDGE, INC.


                                             By:/s/ Pamela D.A. Reeve
                                                ----------------------------
                                                Pamela D.A. Reeve, President
<PAGE>
 
AGREED TO AND ACCEPTED as of the date first above written

/s/ Brian E. Boyle
- -------------------------------
Brian E. Boyle


The persons and entities named below hereby execute this letter solely for the
purpose of agreeing to be bound by the provisions of Section 6.

ENTREPRENEURIAL VENTURES,                ENTREPRENEURIAL, INC.
INC.


By: /s/ Torrence C. Harder               By: /s/ Torrence C. Harder
    ---------------------------              ---------------------------        
Title: President                         Title: President
       ------------------------                 ------------------------        



ENTREPRENEURIAL LIMITED                  ENTREPRENEURIAL 
PARTNERSHIP I                            LIMITED PARTNERSHIP II
By: Entrepreneurial Ventures, Inc.       By: Entrepreneurial Ventures, Inc.
Its: General Partner                     Its: General Partner


By: /s/ Torrence C. Harder               By: /s/ Torrence C. Harder
    ---------------------------              ---------------------------        
Title: President                         Title: President
       ------------------------                 ------------------------        
<PAGE>
 
ENTREPRENEURIAL LIMITED                  ENTREPRENEURIAL LIMITED 
PARTNERSHIP II                           PARTNERSHIP IV
By: Entrepreneurial Ventures, Inc.       By: Entrepreneurial, Inc.
Its: General Partner                     Its: General Partner


By: /s/ Torrence C. Harder               By: /s/ Torrence C. Harder
    ---------------------------              ---------------------------        
Title: President                         Title: President
       ------------------------                 ------------------------        



ENTREPRENEURIAL LIMITED                  ENTREPRENEURIAL LIMITED 
PARTNERSHIP VI                           PARTNERSHIP VII
By: Entrepreneurial, Inc.                By: Entrepreneurial, Inc.
Its: General Partner                     Its: General Partner


By: /s/ Torrence C. Harder               By: /s/ Torrence C. Harder
    ---------------------------              ---------------------------        
Title: President                         Title: President
       ------------------------                 ------------------------        



TORRENCE C. HARDER                       PAMELA D.A. REEVE

/s/ Torrence C. Harder                   /s/ Pamela D.A. Reeve
- -------------------------------          -------------------------------


WILLIAM G. BROWN, III                    BOYLE CORP.

/s/ William G. Brown, III
- -------------------------------          By: /s/ Brian E. Boyle
                                             ---------------------------
                                         Title: President
                                                ------------------------
  
<PAGE>
 
                                                                       EXHIBIT E

  THE WARRANT EVIDENCED HEREBY, AND THE SECURITIES ISSUABLE HEREUNDER, HAVE BEEN
AND WILL BE ISSUED WITHOUT REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, OR THE APPLICABLE SECURITIES LAWS OF ANY STATE.  SUCH SECURITIES HAVE
BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND
SHALL NOT BE SOLD, TRANSFERRED, PLEDGED OR HYPOTHECATED UNLESS THE PROPOSED
DISPOSITION IS THE SUBJECT OF A CURRENTLY EFFECTIVE REGISTRATION STATEMENT UNDER
SAID ACT AND UNDER APPLICABLE STATE SECURITIES LAWS OR UNLESS THE COMPANY HAS
RECEIVED AN OPINION OF COUNSEL, IN FORM AND SUBSTANCE REASONABLY SATISFACTORY TO
THE COMPANY, TO THE EFFECT THAT SUCH REGISTRATION IS NOT REQUIRED UNDER SAID ACT
AND SUCH STATE SECURITIES LAWS IN CONNECTION WITH SUCH DISPOSITION.

                               LIGHTBRIDGE, INC.

                         COMMON STOCK PURCHASE WARRANT
                         -----------------------------

                     Original Issue Date:  August 26, 1996

                           This Warrant is Issued to

                                 SHENG REN TRUST
                       ----------------------------------

(hereinafter called the "Registered Holder," which term shall include its
successors and assigns) by Lightbridge, Inc., a Delaware corporation
(hereinafter referred to as the "Company").  This Warrant may be transferred by
the Registered Holder only in accordance with the provisions of Sections 1.04
and 5 hereof.

1. The Warrant.
   ----------- 

    1.01  For value received and subject to the terms and conditions hereinafter
set forth, the Registered Holder is entitled, upon surrender of this Warrant at
any time on or after the Initial Exercise Date (as defined below) but prior to
three years after such Initial Exercise Date (with the subscription form annexed
hereto duly executed), at the office of the Company at 281 Winter Street,
Waltham, Massachusetts 02154, or such other office in the United States of which
the Company shall notify the Registered Holder hereof in writing, to purchase
from the Company, at the purchase price hereinafter specified (the "Exercise
Price"), 100,000 shares of the Common Stock, $.01 par value per share, of the
Company ("Common Stock").  This Warrant has been issued by the Company in
connection with the execution of the letter agreement of even date herewith
between Brian E. Boyle and the Company (the "Agreement").  The initial Exercise
Price shall be $8.50 per share and shall be subject to adjustment as provided in
Section 1.05(A) below.
<PAGE>
 
     For the purposes of this Warrant, the Initial Exercise Date shall be the
earliest of (i) one year from the Original Issue Date set forth above, (ii) the
effective date of a registration statement filed by the Company with respect to
an initial public offering of shares of its Common Stock, (iii) the date of any
merger or consolidation of the Company, or any sale of shares by the
stockholders of the Company, as a result of which the stockholders of the
Company immediately prior to such merger, consolidation or sale do not own after
such merger, consolidation or sale shares representing at least fifty percent
(50%) of the voting power of the Company or the surviving or resulting
corporation, as the case may be, or (iv) the date the Company is liquidated or
sells or otherwise disposes of all or substantially all its assets.

     As promptly as practicable after surrender of this Warrant and receipt of
payment of the Exercise Price, the Company shall issue and deliver to the
Registered Holder a certificate or certificates for the shares purchased
hereunder, in certificates of such denominations and in such names as the
Registered Holder may specify, together with any other stock, securities or
property which such Registered Holder may be entitled to receive pursuant to
Section 1.05 hereof.  Payment of the Exercise Price shall be made by check made
payable to the order of the Company or wire transfer of funds to a bank account
designated by the Company.  In the case of the purchase of less than all the
shares purchasable under this Warrant, the Company shall cancel this Warrant
upon the surrender hereof and shall execute and deliver a substitute Warrant of
like tenor and date for the balance of the shares purchasable hereunder.

     Notwithstanding the foregoing, however, the Registered Holder may elect to
receive, without the payment by the Registered Holder of any additional
consideration, shares equal to the value of this Warrant or any portion hereof
by the surrender of this Warrant or such portion to the Company, with the form
of subscription at the end hereof duly executed by the Registered Holder, at the
office of the Company (such election a "Net Issue Election").  Thereupon, the
Company shall issue to the Registered Holder such number of fully paid and
nonassessable shares of Common Stock as is computed using the following formula:


                                  X = Y (A-B)
                                      -------
                                         A

where X =  the number of shares to be issued to the Registered Holder pursuant
           to this Section 1.01.

      Y =  the number of shares covered by this Warrant in respect of which the
           Net Issue Election is made pursuant to this subsection 1.01.

      A =  the Fair Market Value of one share of Common Stock as defined below.
           For the purpose of this Section 1.01, the Fair Market Value of one
           share of Common Stock shall be the closing price per share on the
           date the Net Issue Election is made pursuant to this Section 1.01, as
           reported by a nationally recognized stock exchange, or, if the Common
           Stock is not listed on such an exchange, as reported


                                      -2-
<PAGE>
 
          by the National Association of Securities Dealers, Inc. ("Nasdaq") on
          such date, or, if the Common Stock is neither listed on such an
          exchange nor quoted on Nasdaq, as determined by a nationally
          recognized independent investment banking firm jointly selected by the
          Company and the Registered Holder or, if such selection cannot be made
          within five days after delivery of the Net Issue Election, by a
          nationally recognized independent investment banking firm selected by
          the American Arbitration Association in accordance with its rules.

     B =  the Exercise Price in effect under this Warrant on that date the Net
          Issue Election is made pursuant to this Section 1.01.

    1.02  During the period within which the rights represented by this Warrant
may be exercised, the Company shall at all times have authorized and reserved
for the purpose of issue upon exercise of the rights evidenced hereby, a
sufficient number of shares of the class of securities issuable upon exercise of
this Warrant to provide for the exercise of such rights.  Upon surrender for
exercise, this Warrant shall be cancelled and shall not be reissued; provided,
however, that upon the partial exercise hereof a substitute Warrant representing
the rights to subscribe for and purchase any such unexercised portion hereof
shall be issued.

    1.03  This Warrant may be subdivided into one or more Warrants entitling the
Registered Holder to purchase shares of the class of securities issuable upon
exercise of this Warrant in multiples of one or more whole shares, upon
surrender of this Warrant by the Registered Holder for such purpose at the
office of the Company.

    1.04  The Company shall maintain at its office (or at such other office or
agency of the Company as it may from time to time designate in writing to the
Registered Holder hereof), a register containing the name and address of the
Registered Holder of this Warrant.  The Registered Holder of this Warrant shall
be the person in whose name this Warrant is originally issued and registered,
unless a subsequent holder shall have presented to the Company this Warrant,
duly assigned to such holder, for inspection and a written notice of his
acquisition of this Warrant and designating in writing the address of such
subsequent holder, in which case such subsequent holder of this Warrant shall
become the subsequent Registered Holder.  Any Registered Holder of this Warrant
may change his address as shown on such register by written notice to the
Company requesting such change.  Any written notice required or permitted to be
given to the Registered Holder of this Warrant shall be mailed by registered or
certified mail, or sent by reputable overnight courier service, to the
Registered Holder at the address as shown on such register.

    1.05  The rights of the Registered Holder shall be subject to the following
terms and conditions:

   (A)  Adjustment to Exercise Price Upon Financing.  The Exercise Price shall
        -------------------------------------------                           
be $8.50 per share, until and unless a registration statement with respect to an
initial public offering of Common Stock is declared effective by the Securities
and Exchange Commission.  If and only 


                                      -3-
<PAGE>
 
if such a registration is so declared effective, the Exercise Price shall then
and thereafter be equal to the price per share paid by the public in such
initial public offering, effective upon the date of effectiveness of such
registration statement.

    (B) Adjustment to Exercise Price for Subdivision or Combination.  If the
        -----------------------------------------------------------         
Company at any time or from time to time after the issuance of this Warrant
subdivides (by any stock split, stock dividend, recapitalization or otherwise)
the outstanding shares of the class of securities issuable upon exercise hereof
into a greater number of shares, the Exercise Price in effect immediately before
that subdivision shall be proportionately decreased.  If the Company at any time
or from time to time after the issuance of this Warrant combines (by reverse
stock split or otherwise) the outstanding shares of the class of securities
issuable upon exercise hereof, the Exercise Price in effect immediately before
the combination shall be proportionately increased.  Any adjustment under this
paragraph shall become effective at the close of business on the date the
subdivision or combination becomes effective.

    (C) Adjustment in the Number of Shares for Subdivisions or Combinations.
        -------------------------------------------------------------------  
Whenever the Exercise Price is adjusted pursuant to Section 1.05(B), the number
of shares of the class of securities issuable upon exercise hereof also shall be
adjusted by multiplying the number of shares subject to this Warrant immediately
prior to the adjustment of the Exercise Price by a fraction (x) the numerator of
which is the Exercise Price immediately prior to the adjustment and (y) the
denominator of which is the adjusted Exercise Price.

    (D) Adjustments for Certain Dividends and Distributions.  In the event that
        ---------------------------------------------------                    
at any time or from time to time after the Original Issue Date the Company shall
make or issue, or fix a record date for the determination of holders of the
class of securities issuable upon exercise hereof who are entitled to receive a
dividend or other distribution payable in securities of the Company, then and in
each such event, unless such dividend or distribution results in an adjustment
of the Exercise Price pursuant to Section 1.05(B), provision shall be made so
that the Registered Holder of this Warrant shall receive upon exercise hereof in
addition to the securities receivable hereupon, the amount of securities of the
Company that he would have received had this Warrant been exercised on the date
of such event and had he thereafter, during the period from the date of such
event to and including the exercise date, retained such securities receivable by
him as aforesaid during such period, giving application during such period to
all adjustments called for herein.

    (E) Adjustment for Reclassification, Exchange, or Substitution.  In the
        ----------------------------------------------------------         
event that at any time or from time to time after the Original Issue Date, the
class of securities issuable upon the exercise of this Warrant shall be changed
into the same or a different number of shares of any class or classes of stock,
whether by capital reorganization, reclassification, or otherwise (other than a
subdivision or combination of shares or stock dividend provided for above, or a
merger, consolidation, or sale of assets provided for below), then and in each
such event the Registered Holder of this Warrant shall have the right thereafter
to exercise this Warrant for the kind and amount of shares of stock and other
securities and property receivable upon such reorganization, reclassification,
or other change, by holders of the number of shares of the class 


                                      -4-
<PAGE>
 
of securities into which such Warrant might have been exercisable for
immediately prior to such reorganization, reclassification, or change, all
subject to further adjustment as provided herein.

    (F) Adjustment for Merger, Consolidation or Sale of Assets.  In the event
        ------------------------------------------------------               
that at any time or from time to time after the Original Issue Date, the Company
shall merge or consolidate with or into another entity or sell all or
substantially all of its assets, this Warrant shall thereafter be exercisable
for the kind and amount of shares of stock or other securities or property to
which a holder of the number of shares of the class of securities of the Company
deliverable upon exercise of this Warrant would have been entitled upon such
consolidation, merger or sale; and, in such case, appropriate adjustment (as
determined in good faith by the Board of Directors) shall be made in the
application of the provisions set forth in this Section 1.05 with respect to the
rights and interest thereafter of the Registered Holder of this Warrant, to the
end that the provisions set forth in this Section 1.05 (including provisions
with respect to changes in and other adjustments of the Exercise Price) shall
thereafter be applicable, as nearly as reasonably may be, in relation to any
shares of stock or other property thereafter deliverable upon the exercise of
this Warrant.

    (G) No Impairment.  The Company shall not, by amendment of its Charter or
        -------------                                                        
By-Laws or through any reorganization, transfer of assets, consolidation,
merger, 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 to be
observed or performed hereunder by the Company but shall at all times in good
faith assist in the carrying out of all the provisions of this Section 1.05 and
in the taking of all such action as may be necessary or appropriate in order to
protect the rights of the Registered Holder of this Warrant against impairment.

    (H) Notice of Adjustment of Number of Shares.  Upon any adjustment,
        ----------------------------------------                       
readjustment or other change relating to the number of shares purchasable upon
exercise of this Warrant or to the Exercise Price, then, and in each such case,
the Company at its expense shall give written notice thereof, in hand or by
first class mail, postage prepaid, addressed to the Registered Holder at the
address of such Registered Holder as shown on the books of the Company, which
notice shall state the Exercise Price resulting from such adjustment and the
increase or decrease in the number of shares (or other denominations of
securities) purchasable at the Exercise Price upon the exercise of this Warrant
setting forth in reasonable detail the method of calculation and the facts upon
which such calculation is based.

    (I) Notice.  In case at any time: (1) the Company shall pay any dividend or
        ------                                                                 
make any distribution (other than regular cash dividends from earnings or earned
surplus paid at an established rate) to the holders of the class of securities
issuable upon exercise of this Warrant; (2) the Company shall offer for
subscription pro rata to the holders of the class of securities issuable upon
exercise of this Warrant any additional shares of stock of any class or other
rights; (3) there shall be any capital reorganization or reclassification of the
capital stock of the Company, or consolidation or merger of the Company with or
sale of all or substantially all of its assets to another corporation; or (4)
there shall be a voluntary or involuntary dissolution, liquidation or winding up
of the Company; then, in any one or more of such cases, the Company 


                                      -5-
<PAGE>
 
shall give written notice, in hand or by first class mail, postage prepaid,
addressed to the Registered Holder at the address of such Registered Holder as
shown on the books of the Company of the date on which (a) the books of the
Company shall close or a record date shall be fixed for determining the
shareholders entitled to such dividend, distribution or subscription rights, or
(b) such reorganization, reclassification, consolidation, merger, sale,
dissolution, liquidation or winding up shall take place, as the case may be.
Such notice shall also provide reasonable details of the proposed transaction
and specify the date as of which the holders of record of the class of
securities issuable upon exercise of this Warrant shall participate in such
dividend, distribution or subscription rights, or shall be entitled to exchange
their securities for securities or other property deliverable upon such
reorganization, reclassification, consolidation, merger, sale, dissolution,
liquidation or winding up, as the case may be. Such written notice shall be
given at least 20 days prior to the action in question and not less than 20 days
prior to the record date or the date on which the Company's transfer books are
closed in respect thereto.

    (J) Voting Rights.  This Warrant shall not entitle the Registered Holder to
        -------------                                                          
any voting rights or any other rights as a stockholder of the Company but upon
presentation of this Warrant with the subscription form annexed duly executed
and the tender of payment of the Exercise Price at the office of the Company
pursuant to the provisions of this Warrant the Registered Holder shall forthwith
be deemed a stockholder of the Company in respect of the securities for which
the Registered Holder has so subscribed and paid.

    (K) No Change Necessary.  The form of this Warrant need not be changed
        -------------------                                               
because of any adjustment in the Exercise Price or in the number of shares
issuable upon its exercise.  A Warrant issued after any adjustment on any
partial exercise or upon replacement may continue to express the same Exercise
Price and the same number of shares (appropriately reduced in the case of
partial exercise) as are stated on this Warrant as initially issued, and that
Exercise Price and that number of shares shall be considered to have been so
changed as of the close of business on the date of adjustment.

2. Covenant of the Company.  All securities which may be issued upon the
   -----------------------                                              
exercise of the rights represented by this Warrant shall, upon issuance, be duly
authorized, validly issued, fully paid and non-assessable and free from all
taxes, liens and charges with respect to the issue thereof.

3. Fractional Shares.  No fractional shares or scrip representing fractional
   -----------------                                                        
shares shall be issued upon exercise of this Warrant.  If, upon exercise of this
Warrant as an entirety, the Registered Holder would be entitled to receive a
fractional share, then the Company shall pay in cash to such Registered Holder
an amount equal to such fractional share multiplied by the fair market value of
one share of the class of securities issuable upon exercise of this Warrant (as
determined by the Board of Directors of the Company) on the date of such
exercise.

4. Substitution.  In the case this Warrant shall be mutilated, lost, stolen or
   ------------                                                               
destroyed, the Company will issue a new Warrant of like tenor and denomination
and deliver the same (a) in exchange and substitution for and upon surrender and
cancellation of any mutilated Warrant, or 

                                      -6-
<PAGE>
 
(b) in lieu of any Warrant lost, stolen or destroyed, upon receipt of evidence
satisfactory to the Company of the loss, theft, or destruction of such Warrant
(including a reasonably detailed affidavit with respect to the circumstances of
any loss, theft or destruction), and of indemnity (or, in the case of the
initial Registered Holder or any other institutional holder, an indemnity
agreement) satisfactory to the Company.

5. Transfer Restrictions.  This Warrant shall not be sold, transferred, pledged
   ---------------------                                                       
or hypothecated unless the proposed disposition is the subject of a currently
effective registration statement under the Securities Act of 1933, as amended,
or unless the Company has received an opinion of counsel reasonably satisfactory
in form and scope to the Company that such registration is not required.

6. Remedies.  The Company stipulates that the remedies at law of the Registered
   --------                                                                    
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 such terms may be
specifically enforced by a decree for that specific performance of any agreement
contained herein or by an injunction against a violation of any of the terms
hereof or otherwise.

7. Taxes.  The Company shall pay any taxes or other charges that may be imposed
   -----                                                                       
in respect of the issuance and delivery of the Warrant or any securities or
other property upon exercise hereof.

8. Governing Law.  This Warrant and its provisions and the rights and
   -------------                                                     
obligations of the parties hereunder shall be governed by, and construed and
enforced in accordance with, the substantive laws of The Commonwealth of
Massachusetts, without regard to its principles of conflicts of laws.

9. Miscellaneous.  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.  The invalidity or unenforceability of any provision hereof shall in no
way affect the validity or enforceability of any other provision.

  IN WITNESS WHEREOF, the Company has caused this Warrant to be signed by its
President thereunto duly authorized under seal this 26th day of August, 1996.


ATTEST:                                  LIGHTBRIDGE, INC.



_______________________________          By:_____________________________
                                           Its President


                                      -7-
<PAGE>
 
                               SUBSCRIPTION FORM
                               -----------------


  The undersigned, the Registered Holder of the within Warrant, hereby

irrevocably elects to exercise the purchase right represented by such Warrant

for, and to purchase thereunder,    shares of common stock of LIGHTBRIDGE, INC. 

and herewith makes payment of $ therefor and requests that the certificates

representing such shares be issued in the name of and delivered to:


________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

if such shares shall not include all of the shares issuable under this Warrant,

that a new Warrant of like tenor and date be delivered to the undersigned holder

for the shares not issued.



Dated: _____________________________      ____________________________________
                                          Signature
<PAGE>
 
                              FORM OF ASSIGNMENT
                              ------------------


  For value received the undersigned hereby sells, assigns and transfers unto

____________________________ whose address is _________________________________

_____________________________________________________________________________,

the within Warrant with respect to ___________ shares purchasable thereby, and

does hereby irrevocably constitute and appoint

___________________________________ attorney to transfer the within Warrant on

the books of the within named corporation with full power of substitution in the

premises.


Dated:__________________________________


In the presence of:

___________________________________    ______________________________________
                                       Signature
<PAGE>
 
                                                                       EXHIBIT F

                         REGISTRATION RIGHTS AGREEMENT

                                August 26, 1996


Sheng Ren Trust
c/o Mr. Brian E. Boyle
31 Hallett Hill Road
Weston, MA  02193

Dear Mr. Boyle:

     This will confirm that pursuant to the letter agreement of even date
herewith (the "Letter Agreement") between the Lightbridge, Inc. (the "Company")
and Brian E. Boyle, and as an inducement to Mr. Boyle to consummate the
transactions contemplated by the Letter Agreement, the Company covenants and
agrees with Mr. Boyle as follows:

    1.   Certain Definitions.  As used in this Agreement, the following terms
         -------------------                                                 
shall have the following respective meanings:

         "Warrant" shall mean the warrant to purchase 100,000 shares of Common
          -------
    Stock issued by the Company to the Sheng Ren Trust on the date hereof.

         "Commission" shall mean the Securities and Exchange commission, or any
          ----------                                                           
    other federal agency at the time administering the Securities Act.

         "Common Stock" shall mean the Common Stock, $.01 par value, of the
          ------------
     Company, as constituted as of the date of this Agreement.

         "Exchange Act" shall mean the Securities Exchange Act of 1934, as
          ------------
     amended, 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.

         "Registration Expenses" shall mean the expenses so described in Section
          ---------------------
      6.

         "Restricted Stock" shall mean the 100,000 shares of Common Stock issued
          ----------------                                                      
     upon exercise of the Warrant on the date hereof excluding Common Stock
     which has been (a) registered under the Securities Act pursuant to an
     effective registration statement filed thereunder and disposed of in
     accordance with the registration statement covering them or (b) publicly
     sold pursuant to Rule 144 under the Securities Act.

         "Securities Act" shall mean the Securities Act of 1933, as amended, 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.
<PAGE>
 
         "Selling Expenses" shall mean the expenses so described in Section 6.
          ----------------                                                    

    2.   Restrictive Legend.  Each certificate or other document representing
         ------------------                                                  
Restricted Stock or the Warrant shall, except as otherwise provided in this
Section 2 or in Section 3, be stamped or otherwise imprinted with a legend
substantially in the following form:

          "THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
          1933 AND MAY NOT BE TRANSFERRED OR OTHERWISE DISPOSED OF UNLESS IT HAS
          BEEN REGISTERED UNDER THAT ACT OR AN EXEMPTION FROM REGISTRATION IS
          AVAILABLE."

A certificate or other document shall not bear such legend if in the opinion of
counsel satisfactory to the Company (it being agreed that Hale and Dorr shall be
satisfactory) the securities being sold thereby may be publicly sold without
registration under the Securities Act.

    3.   Notice of Proposed Transfer.  Prior to any proposed transfer of the
         ---------------------------                                        
Warrant or any Restricted Stock (other than under the circumstances described in
Section 4), the holder thereof shall give written notice to the Company of its
intention to effect such transfer.  Each such notice shall describe the manner
of the proposed transfer and, if requested by the Company, shall be accompanied
by an opinion of counsel satisfactory to the Company (it being agreed that Hale
and Dorr shall be satisfactory) to the effect that the proposed transfer may be
effected without registration under the Securities Act, whereupon the holder of
such securities shall be entitled to transfer such securities in accordance with
the terms of its notice; provided, however, that no such opinion of counsel
                         -----------------                                 
shall be required for a transfer to one or more partners of the transferor (in
the case of a transferor that is a partnership) or to an affiliated corporation
(in the case of a transferor that is a corporation).  Each certificate or other
document representing Restricted Stock or the Warrant transferred as above
provided shall bear the legend set forth in Section 2, except that such
certificate or other document shall not bear such legend if (i) such transfer is
in accordance with the provisions of Rule 144 (or any other rule permitting
public sale without registration under the Securities Act) or (ii) the opinion
of counsel referred to above is to the further effect that the transferee and
any subsequent transferee (other than an affiliate of the Company) would be
entitled to transfer such securities in a public sale without registration under
the Securities Act.  The restrictions provided for in this Section 3 shall not
apply to securities which are not required to bear the legend prescribed by
Section 2 in accordance with the provisions of that Section.

    4.   Incidental Registration.  If the Company at any time proposes to
         -----------------------                                         
register any of its securities under the Securities Act for sale to the public,
whether for its own account or for the account of other security holders or both
(except with respect to registration statements on Forms S-4, S-8 or another
form not available for registering the Restricted Stock for sale to the public),
each such time it will give written notice to all holders of outstanding
Restricted Stock of its intention so to do.  Upon the written request of any
such holder, received by the Company within 30 days after the giving of any such
notice by the Company, to register any of the Restricted Stock (which request
shall state the intended method of disposition thereof), the 


                                      -2-
<PAGE>
 
Company will use its best efforts to cause the Restricted Stock as to which
registration shall have been so requested to be included in the securities to be
covered by the registration statement proposed to be filed by the Company, all
to the extent requisite to permit the sale or other disposition by the holder
(in accordance with its written request) of such Restricted Stock so registered.
In the event that any registration pursuant to this Section 4 shall be, in whole
or in part, an underwritten public offering of Common Stock, the number of
shares of Restricted Stock to be included in such an underwriting may be reduced
(pro rata among all holders of registration rights requesting registration based
upon the number of shares of Common Stock (excluding Common Stock which has been
(a) registered under the Securities Act pursuant to an effective registration
statement filed thereunder and disposed of in accordance with the registration
statement covering them or (b) publicly sold pursuant to Rule 144 under the
Securities Act) owned by such holders) if and to the extent that the managing
underwriter shall be of the opinion that such inclusion would adversely affect
the marketing of the securities to be sold by the Company therein, provided,
                                                                   -------- 
however, that such number of shares of Restricted Stock shall not be reduced if
- -------                                                                        
any shares are to be included in such underwriting for the account of any person
other than the Company, requesting holders of Restricted Stock or parties to
that certain Registration Rights Agreement dated February 11, 1991, as amended,
among the Company and certain of its security holders (the "Prior Registration
Rights Agreement"), and provided, further, however, that in no event may less
                        --------  -------  -------                           
than one-third of the total number of shares of Common Stock to be included in
such underwriting be made available for shares of Restricted Stock and shares
registerable under the Prior Registration Rights Agreement.  Notwithstanding the
foregoing provisions, the Company may withdraw any registration statement
referred to in this Section 4 without thereby incurring any liability to the
holders of Restricted Stock.

    5.  Registration Procedures.  If and whenever the Company is required by the
        -----------------------                                                 
provisions of Section 4 to use its best efforts to effect the registration of
any shares of Restricted Stock under the Securities Act, the Company will
promptly:

        (a)   prepare and file with the Commission a registration statement with
respect to such securities and use its best efforts to cause such registration
statement to become and remain effective for the period of the distribution
contemplated thereby (determined as hereinafter provided);

        (b) prepare and file with the Commission such amendments and supplements
to such registration statement and the prospectus used in connection therewith
as may be necessary to keep such registration statement effective for the period
specified in paragraph (a) above and comply with the provisions of the
Securities Act with respect to the disposition of all Restricted Stock covered
by, such registration statement in accordance with the sellers' intended method
of disposition set forth in such registration statement for such period;

        (c)   furnish to each seller of Restricted Stock and to each underwriter
such number of copies of the registration statement and the prospectus included
therein (including


                                      -3-
<PAGE>
 
each preliminary prospectus) as such persons reasonably may request in order to
facilitate the public sale or other disposition of the Restricted Stock covered
by such registration statement;

    (d)   use its best efforts to register or qualify the Restricted Stock
covered by such registration statement under the securities or "blue sky" laws
of such jurisdictions as the sellers of Restricted Stock or, in the case of an
underwritten public offering, the managing underwriter reasonably shall request,
provided, however, that the Company shall not for any such purpose be required
- --------  -------                                                             
to qualify generally to transact business as a foreign corporation in any
jurisdiction where it is not so qualified or to consent to general service of
process in any such jurisdiction;

    (e)   use its best efforts to list the Restricted Stock covered by such
registration statement with any securities exchange, if any, on which the Common
Stock of the Company is then listed;

    (f)   immediately notify each seller of Restricted Stock and each
underwriter under such registration statement, at any time when a prospectus
relating thereto is required to be delivered under the Securities Act, of the
happening of any event of which the Company has knowledge as a result of which
the prospectus contained in such registration statement, as then in effect,
includes an untrue statement of a material fact or omits to state a material
fact required to be stated therein or necessary to make the statements therein
not misleading in light of the circumstances then existing;

    (g)   if the offering is underwritten and at the request of any seller of
Restricted Stock, use its best efforts to furnish on the date that Restricted
Stock is delivered to the underwriters for sale pursuant to such registration:
(i) an opinion dated such date of counsel representing the Company for the
purposes of such registration, addressed to the underwriters and to such seller,
stating that such registration statement has become effective under the
Securities Act and that (A) to the best knowledge of such counsel, no stop order
suspending the effectiveness thereof has been issued and no proceedings for that
purpose have been instituted or are pending or contemplated under the Securities
Act, (B) the registration statement, the related prospectus and each amendment
or supplement thereof comply as to form in all material respects with the
requirements of the Securities Act (except that such counsel need not express
any opinion as to financial statements contained therein) and (C) to such other
effects as reasonably may be requested by counsel for the underwriters or by
such seller or its counsel and (ii) a letter dated such date from the
independent public accountants retained by the Company, addressed to the
underwriters and to such seller, stating that they are independent public
accountants within the meaning of the Securities Act and that, in the opinion of
such accountants, the financial statements of the Company included in the
registration statement or the prospectus, or any amendment or supplement
thereof, comply as to form in all material respects with the applicable
accounting requirements of the Securities Act, and such letter shall
additionally cover such other financial matters (including information as to the
period ending no more than five business days prior to the date of such letter)
with respect to such registration as such underwriters reasonably may request;
and


                                      -4-
<PAGE>
 
     (h) make available for inspection by each seller of Restricted Stock, any
underwriter participating in any distribution pursuant to such registration
statement, and any attorney, accountant or other agent retained by such seller
or underwriter, all financial and other records, pertinent corporate documents
and properties of the Company, and cause the Company's officers, directors and
employees to supply all information reasonably requested by any such seller,
underwriter, attorney, accountant or agent in connection with such registration
statement.

     For purposes of Section 5(a) and 5(b), the period of distribution of
Restricted Stock in a firm commitment underwritten public offering shall be
deemed to extend until each underwriter has completed the distribution of all
securities purchased by it, and the period of distribution of Restricted Stock
in any other registration shall be deemed to extend until the earlier of the
sale of all Restricted Stock covered thereby and 120 days after the effective
date thereof.

     In connection with each registration hereunder, the sellers of Restricted
Stock will furnish to the Company in writing such information with respect to
themselves and the proposed distribution by them as reasonably shall be
necessary in order to assure compliance with federal and applicable state
securities laws.

     In connection with each registration pursuant to Section 4 covering an
underwritten public offering, the Company and each seller agree to enter into a
written agreement with the managing underwriter selected in the manner herein
provided in such form and containing such provisions as are customary in the
securities business for such an arrangement between such underwriter and
companies of the Company's size and investment stature.

     6.   Expenses.  All expenses incurred by the Company in complying with
          --------                                                         
Section 4 including, without limitation, all registration and filing fees,
printing expenses, fees and disbursements of counsel and independent public
accountants for the Company, fees and expenses (including counsel fees) incurred
in connection with complying with state securities or "blue sky" laws, fees of
the National Association of Securities Dealers, Inc., transfer taxes, fees of
transfer agents and registrars, costs of insurance and fees and disbursements of
one counsel for the sellers of Restricted Stock, but excluding any Selling
Expenses, are called "Registration Expenses".  All underwriting discounts and
selling commissions applicable to the sale of Restricted Stock are called
"Selling Expenses".

     Except as may otherwise be required by various blue sky laws, the Company
will pay all Registration Expenses in connection with each registration
statement under Section 4.  All Selling Expenses in connection with each
registration statement under Section 4 shall be borne by the participating
sellers in proportion to the number of shares sold by each, or by such
participating sellers other than the Company (except to the extent the Company
shall be a seller) as they may agree.

     7.  Indemnification and Contribution. (a) In the event of a registration of
         --------------------------------                                      
any of the Restricted Stock under the Securities Act pursuant to Section 4, the
Company will indemnify and 


                                      -5-
<PAGE>
 
hold harmless each seller of such Restricted Stock thereunder, each underwriter
of such Restricted Stock thereunder and each other person, if any, who controls
such seller or underwriter within the meaning of the Securities Act, against any
losses, claims, damages or liabilities, joint or several, to which such seller,
underwriter or controlling person may become subject under the Securities Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions in
respect thereof) arise out of or are based upon any untrue statement or alleged
untrue statement of any material fact contained in any registration statement
under which such Restricted Stock was registered under the Securities Act
pursuant to Section 4, any preliminary prospectus or final prospectus contained
therein, or any amendment or supplement thereof, or arise out of or are based
upon the omission or alleged omission to state therein 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, and will reimburse each
such seller, each such underwriter and each such controlling person for any
legal or other expenses reasonably incurred by them in connection with
investigating or defending any such loss, claim, damage, liability or action,
provided, however, that the Company will not be liable in any such case if and
- --------
to the extent that any such loss, claim, damage or liability arises out of or is
based upon an untrue statement or alleged untrue statement or omission or
alleged omission so made in conformity with information furnished by any such
seller, any such underwriter or any such controlling person in writing
specifically for use in such registration statement or prospectus.

    (b)   In the event of a registration of any of the Restricted Stock under
the Securities Act pursuant to Section 4, each seller of such Restricted Stock
thereunder, severally and not jointly, will indemnify and hold harmless the
Company, each person, if any, who controls the Company within the meaning of the
Securities Act, each officer of the Company who signs the registration
statement, each director of the Company, each underwriter and each person who
controls any underwriter within the meaning of the Securities Act, against all
losses, claims, damages or liabilities, joint or several, to which the Company
or such officer, director, underwriter or controlling person may become subject
under the Securities Act or otherwise, insofar as such losses, claims, damages
or liabilities (or actions in respect thereof) arise out of or are based upon
any untrue statement or alleged untrue statement of any material fact contained
in the registration statement under which such Restricted Stock was registered
under the Securities Act pursuant to Section 4, any preliminary prospectus or
final prospectus contained therein, or any amendment or supplement thereof, or
arise out of or are based upon the omission or alleged omission to state therein
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, and will reimburse the Company and each such officer, director,
underwriter and controlling person for any legal or other expenses reasonably
incurred by them in connection with investigating or defending any such loss,
claim, damage, liability or action, provided however, that such seller will be
                                    -------- -------                          
liable hereunder in any such loss if and only to the extent that any such loss,
claim, damage or liability arises out of or is based upon an untrue statement or
alleged untrue statement or omission or alleged omission made in reliance upon
and in conformity with information pertaining to such seller, as such, furnished
in writing to the Company by such seller specifically for use in such
registration statement or prospectus, and provided, further, however, that the
liability of each seller hereunder shall be limited to the 
<PAGE>
 
proportion of any such loss, claim, damage, liability or expense which is equal
to the proportion that the public offering price of the shares sold by such
seller under such registration statement bears to the total public offering
price of all securities sold thereunder, but not in any event to exceed the
proceeds received by such seller from the sale of Restricted Stock covered by
such registration statement.

    (c)  Promptly after receipt by an indemnified party hereunder of notice of
the commencement of any action, such indemnified party shall, if a claim in
respect thereof is to be made against the indemnifying party hereunder, notify
the indemnifying party in writing thereof, but the omission so to notify the
indemnifying party shall not relieve it from any liability which it may have to
such indemnified party other than under this Section 7 and shall only relieve it
from any liability which it may have to such indemnified party under this
Section 7 if and to the extent the indemnifying party is prejudiced by such
omission.  In case any such action shall be brought against any indemnified
party and it shall notify the indemnifying party of the commencement thereof,
the indemnifying party shall be entitled to participate in and, to the extent it
shall wish, to assume and undertake the defense thereof with counsel
satisfactory to such indemnified party, and, after notice from the indemnifying
party to such indemnified party of its election so to assume and undertake the
defense thereof, the indemnifying party shall not be liable to such indemnified
party under this Section 7 for any legal expenses subsequently incurred by such
indemnified party in connection with the defense thereof other than reasonable
costs of investigation and of liaison with counsel so selected, provided,
however, that, if the defendants in any such action include both the indemnified
party and the indemnifying party and the indemnified party shall have reasonably
concluded that there may be reasonable defenses available to it which are
different from or in addition to those available to the indemnifying party or if
the interests of the indemnified party reasonably may be deemed to conflict with
the interests of the indemnifying party, the indemnified party shall have the
right to select a single separate counsel and to assume such legal defenses and
otherwise to participate in the defense of such action, with the expenses and
fees of such separate counsel and other reasonable expenses related to such
participation to be reimbursed by the indemnifying party as incurred.

     (d)  In order to provide for just and equitable contribution to joint
liability under the Securities Act in any case in which either (i) any holder of
Restricted Stock exercising rights under this Agreement, or any controlling
person of any such holder, makes a claim for indemnification pursuant to this
Section 7 but it is judicially determined (by the entry of a final judgment or
decree by a court of competent jurisdiction and the expiration of time to appeal
or the denial of the last right of appeal) that such indemnification may not be
enforced in such case notwithstanding the fact that this Section 7 provides for
indemnification in such case, or (ii) contribution under the Securities Act may
be required on the part of any such selling holder or any such controlling
person in circumstances for which indemnification is provided under this Section
7; then, and in each such case, the Company and such holder will contribute to
the aggregate losses, claims, damages or liabilities to which they may be
subject (after contribution from others) in such proportion so that such holder
is responsible for the portion represented by the percentage that the public
offering price of its Restricted Stock offered by the registration statement
bears to the public offering price of all securities offered by such
registration 


                                      -7-
<PAGE>
 
statement, and the Company is responsible for the remaining portion; provided,
however, that, in any such case, (A) no such holder will be required to
contribute any amount in excess of the public offering price of all such
Restricted Stock offered by it pursuant to such registration statement; and (B)
no person or entity guilty of fraudulent misrepresentation (within the meaning
of Section 11(f) of the Securities Act) will be entitled to contribution from
any person or entity who was not guilty of such fraudulent misrepresentation.

    8.   Changes in Common Stock.  If, and as often as, there is any change in
         -----------------------                                              
the Common Stock by way of a stock split, stock dividend, combination or
reclassification, or through a merger, consolidation, reorganization or
recapitalization, or by any other means, appropriate adjustment shall be made in
the provisions hereof so that the rights and privileges granted hereby shall
continue with respect to the Common Stock as so changed.

    9.   Rule 144 Reporting.  With a view to making available the benefits of
         ------------------                                                  
certain rules and regulations of the Commission which may at any time permit the
sale of the Restricted Stock to the public without registration, at all times
after 90 days after any registration statement covering a public offering of
securities of the Company under the Securities Act shall have become effective,
the Company agrees to:

         (a)  make and keep public information available, as those terms are
understood and defined in Rule 144 under the Securities Act;

         (b) use its best efforts to file with the Commission in a timely manner
all reports and other documents required of the Company under the Securities Act
and the Exchange Act; and

         (c) furnish to each holder of Restricted Stock forthwith upon request a
written statement by the Company as to its compliance with the reporting
requirements of such Rule 144 and of the Securities Act and the Exchange Act, a
copy of the most recent annual or quarterly report of the Company, and such
other reports and documents so filed by the Company as such holder may
reasonably request in availing itself of any rule or regulation of the
Commission allowing such holder to sell any Restricted Stock without
registration.

    10. Representations and Warranties of the Company. The Company represents
        ---------------------------------------------
and warrants to you as follows:

        (a) The execution, delivery and performance of this Agreement by the
Company have been duly authorized by all requisite corporate action and will not
violate any provision of law, any order of any court or other agency of
government, the Charter or By-laws of the Company or any provision of any
indenture, agreement or other instrument to which it or any of its properties or
assets is bound, conflict with, result in a breach of or constitute (with due
notice or lapse of time or both) a default under any such indenture, agreement
or other instrument or result in the creation or imposition of any lien, charge
or encumbrance of any nature whatsoever upon any of the properties or assets of
the Company.


                                      -8-
<PAGE>
 
   (b)  This Agreement has been duly executed and delivered by the Company and
constitutes the legal, valid and binding obligation of the Company, enforceable
in accordance with its terms.

    11.  Miscellaneous.
         ------------- 

         (a) All covenants and agreements contained in this Agreement by or on
behalf of any of the parties hereto shall bind and inure to the benefit of the
respective successors and assigns of the parties hereto (including without
limitation transferees of the Warrant or any Restricted Stock), whether so
expressed or not, provided, however that registration rights conferred herein on
the holders of the Warrant or Restricted Stock shall only inure to the benefit
of a transferee of the Warrant or Restricted Stock if (i) there is transferred
to such transferee at least 20% of the total shares of Restricted Stock
originally issuable under the Warrant (as adjusted as may be required from time
to time by Section 8 hereof) to the direct or indirect transferor of such
transferee or (ii) such transferee is a partner, shareholder or affiliate of a
party hereto.

         (b) All notices, requests, consents and other communications hereunder
shall be in writing and shall be mailed by certified or registered mail, return
receipt requested, postage prepaid, or telexed or telecopied, in the case of
non-U.S. residents, addressed as follows:

         if to the Company at its address set forth in the Letter Agreement;

         if to the Sheng Ren Trust c/o Brian E. Boyle, 31 Hallett Hill Road,
     Weston, Massachusetts 02193;

         if to any subsequent holder of Restricted Stock or the Warrant, to it
     at such address as may have been furnished to the Company in writing by
     such holder;

or, in any case, at such other address or addresses as shall have been furnished
in writing to the Company (in the case of a holder of Restricted Stock or the
Warrant) or to the holders of Restricted Stock and the Warrant (in the case of
the Company) in accordance with the provisions of this paragraph.

         (c) This Agreement shall be governed by and construed in accordance
with the laws of the Commonwealth of Massachusetts.

         (d) This Agreement may not be amended or modified, and no provision
hereof may be waived, without the written consent of the Company and the holders
of at least seventy-five percent (75%) of the outstanding shares of Restricted
Stock.


                                      -9-
<PAGE>
 
    (e)   This Agreement may be executed in two or more counterparts, each of
which shall be deemed an original, but all of which together shall constitute
one and the same instrument.

    (f)  The obligations of the Company to register shares of Restricted Stock
under Section 4 shall terminate twelve and one-half years from the date of this
Agreement.

    (g)  If requested in writing by the underwriters for the initial
underwritten public offering of securities of the Company, each holder of
Restricted Stock who is a party to this Agreement shall agree not to sell
publicly any shares of Restricted Stock or any other shares of Common Stock
(other than shares of Restricted Stock or other shares of Common Stock being
registered in such offering), without the consent of such underwriters, for a
period of not more than 90 days following the effective date of the registration
statement relating to such offering; provided, however, that all persons
                                               -------
entitled to registration rights with respect to shares of Common Stock who are
not parties to this Agreement, all other persons selling shares of Common Stock
in such offering and all executive officers and directors of the Company shall
also have agreed not to sell publicly their Common Stock under the circumstances
and pursuant to the terms set forth in this Section 11(g).

    (h) Notwithstanding the provisions of Section 5(a), the Company's obligation
to file a registration statement, or cause such registration statement to become
and remain effective, shall be suspended for a period not to exceed 90 days in
any 24-month period if there exists at the time material non-public information
relating to the Company which, in the reasonable opinion of the Company, should
not be disclosed.

    (i)  The Company shall not grant to any third party any registration rights
more favorable than any of those contained herein without the written consent of
the holders of at least ninety percent (90%) of the outstanding shares of
Restricted Stock, so long as any of the registration rights under this Agreement
remains in effect.

    (j)  If any provision of this Agreement shall be held to be illegal, invalid
or unenforceable, such illegality, invalidity or unenforceability shall attach
only to such provision and shall not in any manner affect or render illegal,
invalid or unenforceable any other provision of this Agreement, and this
Agreement shall be carried out as if any such illegal, invalid or unenforceable
provision were not contained herein.


                                     -10-
<PAGE>
 
     Please indicate your acceptance of the foregoing by signing and returning
the enclosed counterpart of this letter, whereupon this Agreement shall be a
binding agreement between the Company and you.

                               Very truly yours,

                               LIGHTBRIDGE, INC.



                               By:_____________________________________
                                  Pamela D.A. Reeve, President

AGREED TO AND ACCEPTED as of the
date first above written.

SHENG REN TRUST

By:____________________________________
  Name:
  Title:



                                     -11-

<PAGE>
 
                                                                    EXHIBIT 11.1
 
                               LIGHTBRIDGE, INC.
 
                COMPUTATION OF EARNINGS (LOSS) PER COMMON SHARE
 
<TABLE>   
<CAPTION>
                                                                  THREE MONTHS              SIX MONTHS
                             YEARS ENDED SEPTEMBER 30,         ENDED DECEMBER 31,         ENDED JUNE 30,
                          ----------------------------------  ----------------------  -----------------------
                            1993        1994        1995         1994        1995        1995         1996
                          ---------  ----------  -----------  ----------  ----------  -----------  ----------
<S>                       <C>        <C>         <C>          <C>         <C>         <C>          <C>
PRO-FORMA:
 Weighted Average Number
  of Common and Common
  Equivalent Shares
  Outstanding:
 Common Stock...........                           6,508,424   6,507,846   6,509,214    6,508,319   6,422,537
 Assumed Conversion of
  Preferred Stock.......                           5,247,324   5,247,324   5,247,324    5,247,324   5,247,324
 Common Equivalent
  Shares Resulting from
  stock options and
  warrants (treasury
  stock method).........                                 --      480,753     499,314          --    1,218,222
 SAB 83 Shares (treasury
  stock method).........                             858,747     858,747     858,747      858,747     858,747
                                                 -----------  ----------  ----------  -----------  ----------
 Total..................                          12,614,495  13,094,670  13,114,599   12,614,390  13,746,830
                                                 ===========  ==========  ==========  ===========  ==========
 Net Income (Loss) Ap-
  plicable to Common
  Stock.................                         $(2,432,914) $  411,723  $   72,205  $(1,735,842) $  302,500
                                                 ===========  ==========  ==========  ===========  ==========
 Pro-Forma Income (Loss)
  per Common Share......                         $     (0.19) $     0.03  $     0.01  $     (0.14) $     0.02
                                                 ===========  ==========  ==========  ===========  ==========
PRIMARY:
 Weighted Average Number
  of Common and Common
  Equivalent Shares
  Outstanding:
 Common Stock...........  5,666,400   6,493,091    6,508,424   6,507,846   6,509,214    6,508,319   6,422,537
 Common Equivalent
  Shares Resulting from
  stock options and
  warrants (treasury
  stock method).........        --      397,081          --      480,753     499,314          --    1,218,222
 SAB 83 Shares (treasury
  stock method).........    858,747     858,747      858,747     858,747     858,747      858,747     858,747
                          ---------  ----------  -----------  ----------  ----------  -----------  ----------
 Total..................  6,525,147   7,748,919    7,367,171   7,847,346   7,867,275    7,367,066   8,499,506
                          =========  ==========  ===========  ==========  ==========  ===========  ==========
 Net Income (Loss)......  $(125,423) $  950,272  $(2,432,914) $  411,723  $   72,205  $(1,735,842) $  302,500
 Dividends Accreted on
  Preferred Stock.......   (150,421)   (182,544)    (182,544)    (45,635)    (45,635)     (91,270)    (91,270)
                          ---------  ----------  -----------  ----------  ----------  -----------  ----------
 Net Income (Loss)
  Applicable to Common
  Stock.................  $(275,844) $  767,728  $(2,615,458) $  366,088  $   26,570  $(1,827,112) $  211,230
                          =========  ==========  ===========  ==========  ==========  ===========  ==========
 Primary Income per Com-
  mon Share.............  $   (0.04) $     0.10  $     (0.36) $     0.05  $     0.00  $     (0.25) $     0.02
                          =========  ==========  ===========  ==========  ==========  ===========  ==========
FULLY DILUTED:
 Weighted Average Number
  of Common and Common
  Equivalent Shares
  Outstanding:
 Common Stock...........  5,666,400   6,493,091    6,508,424   6,507,846   6,509,214    6,508,319   6,422,537
 Assumed Conversion of
  Preferred Stock.......  2,910,621   3,243,326    3,243,326   3,243,326   3,243,326    3,243,326   4,213,924
 Common Equivalent
  Shares Resulting from
  stock options and
  warrants (treasury
  stock method).........        --      464,201          --      480,753     499,314          --    1,465,817
 SAB 83 Shares (treasury
  stock method).........    858,747     858,747      858,747     858,747     858,747      858,747     858,747
                          ---------  ----------  -----------  ----------  ----------  -----------  ----------
 Total..................  9,435,768  11,059,365   10,610,497  11,090,672  11,110,601   10,610,392  12,961,025
                          =========  ==========  ===========  ==========  ==========  ===========  ==========
 Net Income (Loss) Ap-
  plicable to Common
  Stock.................  $(125,423) $  950,272  $(2,432,914) $  411,723  $   72,205  $(1,735,842) $  302,500
                          =========  ==========  ===========  ==========  ==========  ===========  ==========
 Fully Diluted Income
  (Loss) per Common
  Share.................  $   (0.01) $     0.09  $     (0.23) $     0.04  $     0.01  $     (0.16) $     0.02
                          =========  ==========  ===========  ==========  ==========  ===========  ==========
</TABLE>    
 

<PAGE>
 
                                                                   EXHIBIT 23.1
 
                         INDEPENDENT AUDITORS' CONSENT
          
  We consent to the use in this Amendment No. 2 to Registration Statement No.
333-6589 of Lightbridge, Inc. of our report dated April 22, 1996 (except for
Notes 4 and 11 as to which the dates are August 8, 1996 and July 15, 1996,
respectively), appearing in this Prospectus, which is a part of such
Registration Statement, and to the reference to us under the heading "Experts"
in such Prospectus.     
 
Deloitte & Touche LLP
 
Boston, Massachusetts
   
August 27, 1996     


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