INFODATA SYSTEMS INC
8-K, 1997-08-06
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                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549


                                   FORM 8-K

                                CURRENT REPORT

                    Pursuant to Section 13 or 15 (d) of the
                      Securities and Exchange Act of 1934

Date of Report (Date of earliest event reported): July 22, 1997


                             INFODATA SYSTEMS INC.
 -----------------------------------------------------------------------------
            (Exact name of Registrant as specified in its charter)


         Virginia                   0-10416                16-0954695
 ---------------------------      ------------           --------------
 (State or other jurisdiction     (Commission            (IRS Employer
      of incorporation)           File Number)           Identification
                                                             Number)

         12150 Monument Drive
         Suite 400
         Fairfax, Virginia                               22033
 ----------------------------------------              ----------
 (Address of principal executive offices)              (zip code)


      Registrant's telephone number, including area code: (703) 934-5202
                                                          --------------

                                Not Applicable
 -----------------------------------------------------------------------------
         (Former name or former address, if changed since last report)

<PAGE>

Item 2.  ACQUISITION OR DISPOSITION OF ASSETS.

     On July 22, 1997,  Infodata  Systems  Inc., a Virginia  corporation  (the
"Company"), acquired 100% of the issued and outstanding capital stock of AMBIA
Corporation,  a  California  corporation  ("AMBIA"),  through the  issuance of
400,000  shares of the Company's  common stock,  par value $.03 per share (the
"Common  Stock"),  to AMBIA's  shareholders,  Alan  Fisher and Razi  Mohiuddin
(collectively, the "Shareholders").  The acquisition was accomplished by means
of a merger  (the  "Merger")  of AMBIA  Acquisition  Corporation,  a  Delaware
corporation  ("Acquisition") and wholly-owned  subsidiary of the Company, with
and into AMBIA,  pursuant to the terms of the  Agreement of Merger and Plan of
Reorganization,  dated as of July 22, 1997 (the "Agreement"), by and among the
Company,  AMBIA,  the  Shareholders,   Software  Partners,  Inc.,  a  Delaware
corporation ("SPI"),  and Acquisition.  A copy of the Agreement is filed as an
exhibit hereto and is incorporated herein by reference.

     As a result of the Merger,  all of the issued and  outstanding  shares of
AMBIA were  exchanged for and converted  into 400,000  shares of the Company's
Common  Stock,  with one share paid to the  Shareholders  in cash in lieu of a
fractional  share,  339,999 shares  delivered to the  Shareholders  and 60,000
shares  delivered to an escrow agent. The escrow is being maintained to secure
the Company against breaches of representations, warranties and covenants made
under  the  Agreement  by  the   Shareholders,   SPI  and  AMBIA.  The  Merger
consideration, having an aggregate value of $3.1 million on the effective date
of the Merger, was determined in arm's-length negotiations between the Company
and the Shareholders of AMBIA.

     AMBIA  is  engaged  in the  business  of  design,  development,  support,
maintenance,  sale,  re-sale and integration of software  products,  including
Adobe Acrobat(TM) add-on products and services, and will continue to engage in
such  business  following  the Merger.  Acquisition  was formed solely for the
purpose of merging with and into AMBIA pursuant to the Agreement.


Item 7.  FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND
         EXHIBITS.

     In accordance  with Items 7(a)(4) and 7(b)(2) of  Form 8-K, the financial
statements  called for by Item 7(a) of Form 8-K and Rule 3-05(b) of Regulation
S-X, and the PRO FORMA financial  information  called for by Item 7(b) of Form
8-K and Article XI of  Regulation  S-X,  will be filed by amendment as soon as
practicable

                                       2

<PAGE>

but not later than October 6, 1997.

     The following exhibit is filed herewith:

<TABLE>
<CAPTION>
<S>                                       <C>
            EXHIBIT NO.                   DOCUMENT

                2                         Agreement  of Merger  and Plan of
                                          Reorganization  dated  as of July
                                          22, 1997,  by and among  Infodata
                                          Systems Inc., AMBIA  Corporation,
                                          Alan  Fisher and Razi  Mohiuddin,
                                          Software   Partners,   Inc.,  and
                                          AMBIA Acquisition Corporation.
</TABLE>


                                       3

<PAGE>

                                  SIGNATURES

     Pursuant to the requirements of the Securities  Exchange Act of 1934, the
Registrant  has duly  caused  this  report to be  signed on its  behalf by the
undersigned thereunto duly authorized.



                                                   INFODATA SYSTEMS INC.
                                                   (Registrant)


Dated: August 7, 1997                              By:/s/HARRY KAPLOWITZ
                                                      ------------------
                                                      Harry Kaplowitz
                                                      President


                                       4


                AGREEMENT AND PLAN OF MERGER AND REORGANIZATION

                          (REVERSE TRIANGULAR MERGER)


                                 BY AND AMONG


                              AMBIA CORPORATION,
                           A CALIFORNIA CORPORATION

                        ALAN FISHER AND RAZI MOHIUDDIN,
                             AMBIA'S SHAREHOLDERS

                           SOFTWARE PARTNERS, INC.,
                            A DELAWARE CORPORATION


                            INFODATA SYSTEMS INC.,
                            A VIRGINIA CORPORATION


                                      AND


                        AMBIA ACQUISITION CORPORATION,
                            A DELAWARE CORPORATION


                                 JULY 22, 1997

<PAGE>

<TABLE>
                               TABLE OF CONTENTS

<CAPTION>
                                                                          Page
                                                                          ----

                                   ARTICLE I

                                  DEFINITIONS
<S>             <C>                                                        <C>
Section 1.01    Definitions...............................................  1


                                  ARTICLE II

                     THE MERGER AND PLAN OF REORGANIZATION

Section 2.01    The Merger................................................  6
Section 2.02    Effects of the Merger.....................................  6
Section 2.03    Directors.................................................  7
Section 2.04    Conversion ...............................................  7
Section 2.05    Tax Consequences; Plan of Reorganization..................  7
Section 2.06    Closing and Closing Date .................................  7

                                  ARTICLE III

                              EXCHANGE OF SHARES

Section 3.01    Exchange of Certificates..................................  7
Section 3.02    Adjustments; Delivery of Certificates.....................  8

                                  ARTICLE IV

       REPRESENTATIONS AND WARRANTIES OF SBI, AMBIA AND THE SHAREHOLDERS

Section 4.01    Organization..............................................  9
Section 4.02    Capitalization............................................  9
Section 4.03    Authority Relative to this Agreement......................  9
Section 4.04    Consents and Approvals; No Violations..................... 10
Section 4.05    Financial Statements...................................... 10
Section 4.06    Absence of Certain Changes................................ 11
Section 4.07    No Undisclosed Liabilities................................ 11
Section 4.08    Accuracy of Statements.................................... 11
Section 4.09    No Default ............................................... 11
Section 4.10    Litigation................................................ 11
Section 4.11    Compliance with Applicable Law............................ 11


                                     i

<PAGE>

Section 4.12    Taxes; Section 355 Spin-Off and Tax-Free Reorganization... 12
Section 4.13    ERISA..................................................... 13
Section 4.14    Intellectual Property..................................... 13
Section 4.15    Change in Control......................................... 14
Section 4.16    Brokers; Finders.......................................... 14
Section 4.17    Operations of AMBIA....................................... 14
Section 4.18    Insurance................................................. 15
Section 4.19    Continuity of Business Enterprise......................... 15
Section 4.20    Improper and Other Payments............................... 16
Section 4.21    Additional Shareholder and SPI Representations............ 16
Section 4.22    Accounts Receivable....................................... 17

                                   ARTICLE V

                       REPRESENTATIONS AND WARRANTIES OF
                           INFODATA AND ACQUISITION

Section 5.01    Organization.............................................. 18
Section 5.02    Capitalization............................................ 18
Section 5.03    Authority Relative to this Agreement...................... 19
Section 5.04    Consents and Approvals; No Violations..................... 19
Section 5.05    Reports................................................... 19
Section 5.06    Accuracy of Statements.................................... 20
Section 5.07    No Undisclosed Liabilities................................ 20
Section 5.08    No Default................................................ 20
Section 5.09    Litigation................................................ 20
Section 5.10    Compliance with Applicable Law............................ 20
Section 5.11    Brokers; Finders.......................................... 21
Section 5.12    Continuity of Business Enterprise......................... 21
Section 5.13    Interim Operations of Acquisition......................... 21


                                  ARTICLE VI

                                   COVENANTS

Section 6.01    Covenants of AMBIA........................................ 21
Section 6.02    Press Releases............................................ 23
Section 6.03    No Solicitation........................................... 23
Section 6.04    Access to Information..................................... 24
Section 6.05    Best Efforts.............................................. 24
Section 6.06    Shareholders Meeting...................................... 24
Section 6.07    Contact Clients........................................... 24
Section 6.08    Notice Regarding Change in Circumstances.................. 25


                                     iii

<PAGE>

Section 6.09    Indemnification........................................... 25
Section 6.10    Certain Benefits.......................................... 28
Section 6.11    AMBIA Stock Plans, etc.................................... 28
Section 6.12    Registration of Infodata Shares........................... 29
Section 6.13    Expenses.................................................. 29
Section 6.14    Noncompetition............................................ 29
Section 6.15    Appointment of Fisher as Infodata Director................ 31
Section 6.16    Employment Agreement for Mohiuddin........................ 31
Section 6.17    Consistent Tax Treatment for Spin-Off..................... 31
Section 6.18    Negative Covenants of Infodata............................ 31

                                  ARTICLE VII

                                  CONDITIONS

Section 7.01    Conditions to Each Party's Obligation to Effect the
                Merger.................................................... 32
Section 7.02    Conditions of Obligations of Infodata and Acquisition to
                Effect the Merger......................................... 32
Section 7.03    Conditions of Obligation of AMBIA to Effect the Merger.... 34

                                 ARTICLE VIII

                           TERMINATION AND AMENDMENT

Section 8.01    Termination............................................... 37
Section 8.02    Effect of Termination..................................... 37
Section 8.03    Amendment................................................. 37
Section 8.04    Extension; Waiver......................................... 37

                                  ARTICLE IX

                         POST-EFFECTIVE DATE COVENANTS

Section 9.01    Tax Returns............................................... 38
Section 9.02    Adjustment................................................ 38
Section 9.03    Further Instruments and Actions........................... 38

                                   ARTICLE X

                                 MISCELLANEOUS

Section 10.01   Survival of Representations and Warranties; Escrow........ 38


                                     iii

<PAGE>

Section 10.02   Notices................................................... 39
Section 10.03   Descriptive Headings...................................... 40
Section 10.04   Counterparts.............................................. 40
Section 10.05   Entire Agreement; Assignment.............................. 41
Section 10.06   Governing Law; Jurisdiction and Service of Process; 
                Dispute Resolution........................................ 41
Section 10.07   Publicity................................................. 43
Section 10.08   Parties in Interest....................................... 43
</TABLE>

<TABLE>
 Exhibits
 --------
<S>                  <C>
Exhibit 2.01         Agreement of Merger
Exhibit 3.01(a)      List of Shareholders and Amounts of Infodata Shares To Be Received
Exhibit 4.02         AMBIA Securities Issued and Outstanding; AMBIA Ownership of Other
                     Businesses
Exhibit 4.04         AMBIA Required Consents and Approvals; List of Violations
Exhibit 4.05         Supplemental Disclosures to Financial Statements
Exhibit 4.06         AMBIA Material Adverse Changes
Exhibit 4.09         AMBIA Defaults
Exhibit 4.10         AMBIA Litigation
Exhibit 4.12         AMBIA Tax Statutes of Limitations
Exhibit 4.13         AMBIA Employee Benefit Plan Obligations
Exhibit 4.14         AMBIA's Intellectual Property
Exhibit 4.15         AMBIA Change in Control Agreements
Exhibit 4.17         Operations of AMBIA
Exhibit 4.18         AMBIA Insurance Coverage
Exhibit 4.20         AMBIA Improper and Other Payments
Exhibit 4.21(c)      Interests in AMBIA's Property
Exhibit 5.02         Infodata's Subsidiaries
Exhibit 5.04         Infodata Required Consents and Approvals; List of Violations
Exhibit 5.05         Infodata Reports
Exhibit 5.08         Infodata Defaults
Exhibit 5.09         Infodata Litigation
Exhibit 6.10         AMBIA Employment, Severance and Consulting Agreements
Exhibit 6.11(b)      Form of Infodata Stock Option Agreement
Exhibit 6.12         Registration Rights Agreement
Exhibit 6.16         Employment Agreement of Razi Mohiuddin
Exhibit 7.02(e)      Opinion of Fenwick & West, LLP
Exhibit 7.03(e)      Opinion of Freedman, Levy, Kroll & Simonds
Exhibit 7.03(f)      Tax Opinion of Freedman, Levy, Kroll & Simonds
Exhibit 7.03(f)-1    Tax Representation Letters
Exhibit 10.01(b)     Escrow Agreement
Exhibit 10.01(b)(i)  Listing of Escrow Shares Contributed on Behalf of Each Shareholder
</TABLE>


                                      iv

<PAGE>

                AGREEMENT AND PLAN OF MERGER AND REORGANIZATION

     THIS AGREEMENT AND PLAN OF MERGER AND  REORGANIZATION is dated as of July
22, 1997, by and among AMBIA Corporation,  a California corporation ("AMBIA");
Alan Fisher and Razi Mohiuddin (the "Shareholders");  Software Partners, Inc.,
a Delaware corporation  ("SPI");  Infodata Systems Inc. a Virginia corporation
("Infodata");  and AMBIA Acquisition Corporation, a Delaware corporation and a
wholly-owned subsidiary of Infodata ("Acquisition").


                                   ARTICLE I

                                  DEFINITIONS

     1.01 DEFINITIONS.  The following terms shall have the following  meanings
for purposes of this Agreement:

     "Affiliate"  has the meaning  set forth in Rule 12b-2 of the  regulations
promulgated under the Securities Exchange Act.

     "Agreement" means this Agreement, all Exhibits hereto, and all amendments
made hereto and thereto by written agreement among the parties.

     "AMBIA  Benefit  Plans"  has the  meaning  set forth in  Section  4.13(b)
hereof.

     "AMBIA  Confidential  Information"  means  all  confidential  information
concerning  AMBIA  or its  Affiliates  that  (i) is not  and  has  not  become
ascertainable or obtainable from public or published information,  (ii) is not
received from a third party or is received from a third party  pursuant to the
authorization  of  AMBIA,  SPI  or  either  or  both  of the  Shareholders  in
connection  with  Infodata's due diligence  review of AMBIA,  (iii) was not in
Infodata's  possession  prior to disclosure  thereof to Infodata in connection
with the  transactions  contemplated  herein,  and (iv) was not  independently
developed by Infodata.

     "AMBIA Equity  Incentive Plan" means the incentive stock and stock option
plan dated June 1, 1996,  pursuant to which  AMBIA has  reserved up to 500,000
shares of AMBIA  common  stock,  no par  value  per  share,  for  issuance  as
restricted  stock or stock bonuses or upon  exercise of stock options  granted
under such plan.

     "AMBIA Material Adverse Change" means a change (or circumstance involving
a  prospective  change)  that  has or can  reasonably  be  expected  to have a
material,  adverse impact on the business,  operations,  assets,  liabilities,
results of  operations,  cash flows or condition  (financial  or otherwise) of
AMBIA, taken as a whole.


<PAGE>

     "AMBIA  Material   Adverse  Effect"  means  an  effect  (or  circumstance
involving  a  prospective  effect)  on  the  business,   operations,   assets,
liabilities,  results of  operations,  cash flows or condition  (financial  or
otherwise)  of AMBIA that is or can  reasonably  be expected to be  materially
adverse.

     "AMBIA Permits" has the meaning set forth in Section 4.11 hereof.

     "AMBIA Shares" means the 4,500,000  shares of common stock,  no par value
per share,  of AMBIA held of record by the  Shareholders,  2,844,888  of which
shares are held of record by Alan  Fisher and  1,655,112  of which  shares are
held of record by Razi Mohiuddin.

     "AMBIA Stock Option" has the meaning set forth in Section 6.11 hereof.

     "Business"  means,  with  respect to Infodata  or AMBIA,  (i) the design,
development,   installation,   implementation,   sale,  support,  maintenance,
marketing and management of electronic document management systems,  including
the performance of integration services and the design, development,  sale and
re-sale of software  products  relating to such systems,  and (ii) the design,
development,  support, maintenance,  sale, re-sale and integration of software
products  that are being  produced  or are in the  process of being  produced,
designed or developed by Infodata or AMBIA as of the date of this Agreement.

     "Business  Day" means any day of the year other than (i) any  Saturday or
Sunday or (ii) any other day on which  commercial banks located in Washington,
D.C., are generally closed for business.

     "California  Corporations Code" means the California Corporations Code of
1968, as amended.

     "Certificates" has the meaning set forth in Section 3.01(a) hereof.

     "Agreement of Merger" has the meaning set forth in Section 2.01 hereof.

     "Closing" means the consummation of the transactions contemplated herein,
as provided in Section 2.06 hereof.

     "Closing Date" has the meaning set forth in Section 2.06 hereof.

     "Code" means the United States Internal Revenue Code of 1986, as amended.

     "Confidential  Information"  has the meaning set forth in Section 6.14(e)
hereof.

     "Conversion Ratio" has the meaning set forth in Section 2.04(a) hereof.

     "Disagreement"  shall  have the  meaning  set forth in  Section  10.06(c)
hereof.


                                       2

<PAGE>

     "ERISA"  means the Employee  Retirement  Income  Security Act of 1974, as
amended.

     "Effective Date" has the meaning set forth in Section 2.01 hereof.

     "Effective Time" has the meaning set forth in Section 2.01 hereof.

     "Employment  Agreement"  has the meaning set forth in Section 6.16 hereof
and substantially in the form set forth in EXHIBIT 6.16.

     "Ending Date" has the meaning set forth in Section 6.14(a) hereof.

     "Escrow Agent" has the meaning set forth in Section 10.01(b) hereof.

     "Escrow  Agreement" has the meaning set forth in Section 10.01(b) hereof,
and substantially in the form attached hereto as EXHIBIT 10.01(b).

     "Escrow Fund" has the meaning set forth in Section 10.01(b) hereof.

     "Escrow Period" has the meaning set forth in Section 10.01(b) hereof.

     "Escrow Shares" has the meaning set forth in Section 10.01(b) hereof.

     "Financial  Statements"  means: (a) the audited  financial  statements of
AMBIA as of December 31, 1996  (including  all schedules  and notes  thereto),
consisting of the balance  sheets at such dates and the related  statements of
income and  expenses,  retained  earnings,  and  changes in cash flows for the
eight-month period beginning May 1, 1996 and ending December 31, 1996; and (b)
the Interim Financial Statements.

     "GAAP" means U.S. generally accepted accounting principles in effect from
time to time.

     "Governmental Authority" means the government of the United States or any
foreign country or any state or political  subdivision thereof and any entity,
agency,  body  or  authority  exercising  executive,  legislative,   judicial,
regulatory or administrative functions of or pertaining to government.

     "Indemnified Person" means the Person or Persons entitled to, or claiming
a right to, indemnification.

     "Indemnifying  Person"  means  the  Person  or  Persons  claimed  by  the
Indemnified Person to be obligated to provide indemnification.

     "Infodata  Common  Stock" has the  meaning  set forth in Section  5.02(a)
hereof.


                                       3

<PAGE>

     "Infodata  Confidential  Information" means all confidential  information
concerning  Infodata  or its  Affiliates  that  (i) is not and has not  become
ascertainable or obtainable from public or published information,  (ii) is not
received from a third party or is received from a third party  pursuant to the
authorization of Infodata,  (iii) was not in AMBIA's, SPI's, or either or both
of  the   Shareholders'   possession  prior  to  disclosure   thereof  to  the
Shareholders,  AMBIA or SPI in connection with the  transactions  contemplated
herein,  and (iv) was not  independently  developed by AMBIA, SPI or either or
both of the Shareholders.

     "Infodata  Indemnified Parties" means Infodata and each of its Affiliates
(including,   after  the  Closing,   AMBIA)  and  their  respective  officers,
directors,  employees,  agents and representatives,  provided that in no event
shall the Shareholders or SPI be deemed an Infodata Indemnified Party.

     "Infodata  Material  Adverse  Change"  means a  change  (or  circumstance
involving a prospective change) that has or can reasonably be expected to have
a material, adverse impact on the business,  operations,  assets, liabilities,
results of  operations,  cash flows or condition  (financial  or otherwise) of
Infodata and any of its subsidiaries, taken as a whole.

     "Infodata  Material  Adverse  Effect"  means an effect  (or  circumstance
involving  a  prospective  effect)  on  the  business,   operations,   assets,
liabilities,  results of  operations,  cash flows or condition  (financial  or
otherwise) of Infodata and any of its subsidiaries,  taken as a whole, that is
or can reasonably be expected to be materially adverse.

     "Infodata Permits" has the meaning set forth in Section 5.10 hereof.

     "Infodata SEC Reports" has the meaning set forth in Section 5.05 hereof.

     "Infodata  Shares"  means the 400,000  shares of Common  Stock,  $.03 par
value per share, of Infodata, issuable to the Shareholders pursuant to Section
2.04(a) of this Agreement.

     "Intellectual  Property"  means  any and  all  trademarks,  trade  names,
service marks, patents, copyrights (including any registrations, applications,
licenses  or  rights  relating  to any of the  foregoing),  technology,  trade
secrets, inventions,  know-how, designs, computer programs, processes, and all
other intangible assets, properties and rights. The term "AMBIA's Intellectual
Property"  means  any and all  Intellectual  Property  owned  by  AMBIA in the
conduct of its  business,  as defined in Section  4.14 hereof and set forth in
EXHIBIT 4.14 attached hereto.

     "Interim  Financial  Statements"  means  any of the  unaudited  financial
statements of AMBIA as of June 30, 1997  (including  any and all schedules and
notes  thereto),  consisting  of the  balance  sheet  at  such  date,  related
statement of income and expenses,  retained  earnings,  and/or changes in cash
flows for the six-month period then ended, which statements shall be delivered
to Infodata pursuant to Section 4.05 hereof.


                                       4

<PAGE>

     "Law" means any law, statute, regulation, ordinance, rule, order, decree,
judgment,  consent decree,  settlement  agreement or governmental  requirement
enacted,  promulgated,  entered  into,  agreed or imposed by any  Governmental
Authority.

     "Lien"  means any  mortgage,  lien (except for any lien for Taxes not yet
due and payable),  charge,  restriction,  pledge,  security interest,  option,
lease or sublease, claim, right of any third party, easement,  encroachment or
encumbrance.

     "Loss" or "Losses" means any and all liabilities,  losses, costs, claims,
damages (including  consequential damages),  penalties and expenses (including
reasonable  attorneys'  fees  and  expenses  and  costs of  investigation  and
litigation).  In the event any of the foregoing are  indemnifiable  hereunder,
the terms "Loss" and "Losses" shall include any and all reasonable  attorneys'
fees and expenses and costs of  investigation  and litigation  incurred by the
Indemnified  Person in enforcing  such  indemnity.  Losses shall be reduced by
reason of tax benefits or any applicable  insurance proceeds allegedly enjoyed
as a result  of such  Losses by any  Indemnified  Party.  Without  limitation,
"Loss" and "Losses" shall include reasonable fees and disbursements of counsel
incurred  by any  Indemnified  Party in an action or  proceeding  between  the
Indemnifying  Party and the Indemnified Party or between the Indemnified Party
and any third party or otherwise.

     "Merger" has the meaning set forth in Section 2.01 hereof.

     "New Shares" has the meaning set forth in Section 10.01(b) hereof.

     "Person"  means  any  individual,  corporation,   proprietorship,   firm,
partnership, limited partnership, limited liability company, limited liability
partnership,  trust,  association  or other entity,  including a government or
government department, agency or instrumentality.

     "Post-Merger Continuity Period" has the meaning set forth in Section 6.12
hereof.

     "Primary  Opinion" has the meaning set forth in Sections 7.02 and 7.03(e)
hereof.

     "Registration Rights Agreement" has the meaning set forth in Section 6.12
hereof and substantially in the form in EXHIBIT 6.12.

     "Replacement Option" has the meaning set forth in Section 6.11 hereof.

     "SEC" means the Securities and Exchange Commission.

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

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

     "Spin-Off" has the meaning set forth in Section 4.12(b) hereof.


                                       5

<PAGE>

     "Subsidiaries"  means any  Person  50.1% or more of the  voting  power of
which is controlled by another Person.

     "Surviving Corporation" has the meaning set forth in Section 2.01 hereof.

     "Taxes"  means  all  taxes,  charges,   fees,  duties,  levies  or  other
assessments,  including  income,  gross  receipts,  net proceeds,  ad valorem,
turnover,  real and personal property  (tangible and intangible),  sales, use,
franchise,  excise, value added, stamp, leasing, lease, user, transfer,  fuel,
excess profits,  occupational,  interest equalization,  severance,  employee's
income and employment tax withholding, other withholding,  unemployment taxes,
interest,  penalties and/or additions to tax attributable  thereto,  which are
imposed by any Governmental Authority.

     "Tax Opinion" has the meaning set forth in Section 7.03(f) hereof.

     "Tax Return" means any report, return or other information required to be
supplied to a Governmental Authority in connection with any Taxes.


                                  ARTICLE II

                     THE MERGER AND PLAN OF REORGANIZATION

     Section  2.01 THE MERGER.  Upon the terms and  subject to the  conditions
hereof, as promptly as practicable following the satisfaction or waiver of the
conditions set forth in Article VI hereof,  unless the parties shall otherwise
agree, an agreement of merger in the form attached hereto as EXHIBIT 2.01 (the
"Agreement of Merger")  providing for the merger of Acquisition  with and into
AMBIA (the "Merger")  shall be duly prepared,  executed and filed by AMBIA, as
the  surviving  corporation  (sometimes  also  referred  to as the  "Surviving
Corporation"),  in accordance  with the relevant  provisions of the California
Corporations  Code,  and the  parties  hereto  shall  take any  other  actions
required by law to make the Merger  effective.  Following  the Merger,  AMBIA,
with all its purposes,  objects,  rights,  privileges,  powers and franchises,
shall  continue,  and  Acquisition  shall cease to exist.  The Merger shall be
effective at the time (the  "Effective  Time") and on the date (the "Effective
Date")  that a properly  executed  Agreement  of Merger is duly filed with the
Secretary  of State of  California  in  accordance  with  Section  1103 of the
California Corporations Code; PROVIDED, HOWEVER, that by mutual consent of the
parties,   such   Agreement  of  Merger  may  provide  for  a  later  date  of
effectiveness  of the Merger not more than thirty (30) days after such filing.
After the Effective Time and Effective Date, a closing shall take place at the
offices of Freedman, Levy, Kroll & Simonds, in Washington,  D.C., as set forth
in Section 2.06 hereof.

     Section 2.02 EFFECTS OF THE MERGER. The Merger shall have the effects set
forth in Section 1107 of the California Corporations Code. As of the Effective
Time,  the  Surviving  Corporation  shall  be  a  wholly-owned  subsidiary  of
Infodata.


                                       6

<PAGE>

     Section  2.03  DIRECTORS.  The  directors  and  officers  of  Acquisition
immediately  prior to the  Effective  Time shall be the initial  directors and
officers of the Surviving  Corporation  until their successors shall have been
duly elected or appointed and shall have been qualified or until their earlier
death, resignation or removal in accordance with the articles of incorporation
and bylaws of the Surviving Corporation.

     Section 2.04  CONVERSION.  At the Effective Time, by virtue of the Merger
and  without  any action on the part of  Infodata,  Acquisition,  AMBIA or the
holder of any of the following securities:

          (a) Subject to Sections 2.01 and 3.02(a),  the AMBIA Shares shall be
converted into four hundred thousand  (400,000)  fully-paid and  nonassessable
Infodata Shares, at a conversion ratio of eleven and one-quarter (11.25) AMBIA
Shares for every one (1) Infodata Share (the "Conversion Ratio").

          (b)  Each  issued  and  outstanding  share of the  capital  stock of
Acquisition   shall  be  converted   into  and  become  one   fully-paid   and
nonassessable share of common stock of the Surviving Corporation.

     Section 2.05 TAX  CONSEQUENCES;  PLAN OF  REORGANIZATION.  It is intended
that the Merger  shall  constitute  a  reorganization  within  the  meaning of
Section 368(a) of the Code, and that this Agreement  shall  constitute a "plan
of reorganization" for the purposes of Section 368 of the Code.

     Section 2.06 CLOSING. The closing of the merger (the "Closing") will take
place at the offices of Freedman, Levy, Kroll & Simonds,  Washington, D.C., at
10:00  A.M.  (EDT) no later  than three (3)  Business  Days  after  Infodata's
receipt  of  confirmation  from the  California  Secretary  of State  that the
Agreement of Merger has been approved as filed,  or at such other place,  time
and date as the parties may agree upon in writing (the "Closing Date").


                                  ARTICLE III

                              EXCHANGE OF SHARES

     Section 3.01 EXCHANGE OF CERTIFICATES.

          (a) At the Closing,  Infodata  shall  deliver  certificates  for (i)
Sixty Thousand (60,000) Infodata Shares, as adjusted pursuant to Section 3.02,
to the Escrow Agent pursuant to Section 10.01(b) hereof and (ii) Three Hundred
Forty Thousand  (340,000)  Infodata Shares, as adjusted,  to the Shareholders,
registered  in the names of the  Shareholders  and in the amounts  provided on
attached EXHIBIT 3.01(a).  Such certificates shall bear the restrictive legend
contained in Section 4.21(f) hereof.


                                       7

<PAGE>

          (b) At the Closing,  each holder of a  certificate  or  certificates
which  immediately  prior to the Effective Time  represented  all of the AMBIA
Shares (the "Certificates")  shall deliver the Certificates,  and risk of loss
and title to the Certificates shall pass upon delivery of the Certificates, to
Infodata,  and the  Certificates  shall be in such  form and have  such  other
provisions as Infodata and AMBIA may  reasonably  specify.  Such holders shall
deliver and execute all necessary and  appropriate  stock transfer  powers and
other documentation to transfer risk of loss and title to the Certificates and
the AMBIA Shares to Infodata.  Upon surrender of the Certificates to Infodata,
together  with such stock powers or other  documentation  duly  executed,  the
holders of such Certificates shall be entitled to receive in exchange therefor
the  certificates  representing  whole  Infodata  Shares  and  cash in lieu of
fractional  shares, if applicable,  which such holder has the right to receive
pursuant to the  provisions of this  Agreement  excluding any Infodata  Shares
deposited  into  Escrow  pursuant  to  Section   10.01(b)   hereof,   and  the
Certificates so surrendered shall forthwith be cancelled.

          (c)  Following  the  Effective  Time,  there  shall  be  no  further
registration  of  transfers  on the  stock  transfer  books  of the  Surviving
Corporation of AMBIA Shares which were  outstanding  immediately  prior to the
Effective  Time. If, after the Effective Time,  Certificates  are presented to
the  Surviving  Corporation  for any  reason,  they  shall  be  cancelled  and
exchanged as provided in this Article III.

          (d) No certificate or scrip representing  fractional Infodata Shares
shall be issued upon the  surrender  for  exchange of  Certificates,  and such
fractional  share  interests  will not entitle the owner thereof to vote or to
any rights of a stockholder of Infodata. In lieu of any such fractional share,
Infodata  shall  pay to each  Shareholder  an  amount  in cash  determined  by
multiplying  (i) the closing price of Infodata  Shares as reported by THE WALL
STREET JOURNAL for the trading day immediately preceding the Effective Date by
(ii)  the  fraction  of an  Infodata  Share to which  such  Shareholder  would
otherwise be entitled. At the Closing,  Infodata shall pay such amounts to the
Shareholders in accordance with the terms of this Article III.

     Section 3.02 ADJUSTMENTS;  DELIVERY OF CERTIFICATES. If, between the date
of this  Agreement  and the Effective  Time,  the AMBIA Shares or the Infodata
Shares  shall  have  been  exchanged  into a  different  number of shares or a
different class by reason of any reclassification, recapitalization, split-up,
combination,  exchange of shares or readjustment,  or a stock dividend thereon
shall be declared with a record date within such period, the amount into which
the Shares will be converted in the Merger shall be correspondingly adjusted.


                                  ARTICLE IV

       REPRESENTATIONS AND WARRANTIES OF SPI, AMBIA AND THE SHAREHOLDERS

     Except as  provided  in  Section  4.21 and  except  with  respect  to any
representations or warranties regarding the "knowledge" or "best knowledge" of
any  Person  for  which  such  representations  and  warranties  shall be made
severally and not jointly, SPI, AMBIA and the


                                      8

<PAGE>

Shareholders  jointly and  severally  represent  and  warrant to Infodata  and
Acquisition as of the date of this Agreement and on the Effective Date (except
as  otherwise  provided  herein)  as  follows;  PROVIDED,  HOWEVER,  that  any
disclosure  or reference set forth in any Exhibit  attached to this  Agreement
shall apply to and/or  qualify any of the  representations  or warranties  set
forth in this Article IV:

     Section 4.01 ORGANIZATION. AMBIA is a corporation duly organized, validly
existing  and in  good  standing  under  the  laws of  California  and has all
requisite  power and authority to own, lease and operate its properties and to
carry on its  business  as now being  conducted.  AMBIA is duly  qualified  or
licensed and in good standing to do business in each jurisdiction in which the
property  owned,  leased  or  operated  by it or the  nature  of the  business
conducted by it makes such  qualification  or licensing  necessary,  except in
such  jurisdictions  where the failure to be so duly qualified or licensed and
in good  standing  would  not in the  aggregate  result  in an AMBIA  Material
Adverse  Effect.  AMBIA has  heretofore  delivered  to Infodata  accurate  and
complete copies of its articles of incorporation  and bylaws,  as currently in
effect.

     Section 4.02  CAPITALIZATION.  (a) The authorized  capital stock of AMBIA
consists of 5,000,000 AMBIA Shares of which, as of the date of this Agreement,
4,500,000 were issued and  outstanding.  All the issued and outstanding  AMBIA
Shares are validly issued, fully paid and nonassessable and free of preemptive
rights.  As of the date of this Agreement and on the Effective  Date,  390,000
AMBIA Shares were issuable upon exercise of options, each of which options has
an  exercise  price of $.15 per share and was  granted  pursuant  to the AMBIA
Equity  Incentive Plan.  AMBIA has issued no other shares of its capital stock
nor securities substantially equivalent to capital stock.

     Except as set  forth  above,  in  EXHIBIT  4.02  attached  hereto,  or as
contemplated  hereby,  there are not now, and at the Effective Time there will
not be, any shares of capital stock (or securities substantially equivalent to
capital stock) of AMBIA issued or outstanding or any  subscriptions,  options,
warrants,  calls,  rights,  convertible  securities  or  other  agreements  or
commitments of any character  obligating AMBIA to issue,  transfer or sell any
of its securities.

          (b)  Except  as  disclosed  in  EXHIBIT  4.02,  AMBIA  does not own,
directly or  indirectly,  any capital stock or other equity  securities of any
corporation  or have any  direct  or  indirect  equity,  voting  or  ownership
interest in any  business  other than its own.  There are not now,  and at the
Effective  Time there will not be, any voting  trusts or other  agreements  or
understandings  to which  AMBIA is a party or is  bound  with  respect  to the
voting of the capital stock of AMBIA.

     Section  4.03  AUTHORITY  RELATIVE  TO THIS  AGREEMENT.  AMBIA  has  full
corporate  power and  authority to execute and deliver this  Agreement  and to
consummate the transactions  contemplated hereby. SPI has full corporate power
and  authority  to execute and deliver  this  Agreement  and to enter into the
indemnification provided under Section 6.09 hereof. The execution and delivery
of this Agreement and the consummation of the transactions contemplated hereby
have been duly and validly authorized by the Board of Directors and the


                                      9

<PAGE>

Shareholders of AMBIA and no other corporate  proceedings on the part of AMBIA
are necessary to authorize this Agreement or to consummate the transactions so
contemplated.  This Agreement has been duly and validly executed and delivered
by  AMBIA,  SPI and the  Shareholders  and  constitutes  a valid  and  binding
agreement  of them,  enforceable  against them in  accordance  with its terms,
except  as to the  effect,  if any,  of (a)  applicable  bankruptcy  and other
similar laws affecting the rights of creditors generally, and (b) rules of law
or  equity  governing  specific  performance,   injunctive  relief  and  other
equitable remedies.

     Section 4.04 CONSENTS AND APPROVALS;  NO VIOLATIONS.  Except as otherwise
provided in EXHIBIT 4.04 attached  hereto and in the filing and recordation of
an  Agreement  of  Merger,  as  required  by  Section  1103 of the  California
Corporations  Code,  and a Certificate  of Merger,  as required under Delaware
law, no filing with, and no permit, authorization, consent or approval of, any
Governmental  Authority  is  necessary  for the  consummation  by AMBIA of the
transactions  contemplated by this  Agreement.  Except as set forth in EXHIBIT
4.04,  neither the execution  and delivery of this  Agreement by AMBIA nor the
consummation by AMBIA of the transactions  contemplated  hereby nor compliance
by AMBIA with any of the provisions hereof will (i) conflict with or result in
any breach of any  provision  of the  articles of  incorporation  or bylaws of
AMBIA, (ii) result in a violation or breach of, or constitute (with or without
due  notice or lapse of time or both) a default  (or give rise to any right of
termination, cancellation or acceleration) under, any of the terms, conditions
or provisions  of any note,  bond,  mortgage,  indenture,  license,  contract,
agreement or other  instrument  or  obligation to which AMBIA is a party or by
which it or any of its properties or assets may be bound, or (iii) violate any
order,  writ,  injunction,   decree,  statute,   treaty,  rule  or  regulation
applicable to AMBIA or any of its properties or aseeto,  except in the case of
(ii) or (iii)  for  violations,  breaches  or  defaults  which  are not in the
aggregate material to the business, operations or financial condition of AMBIA
taken as a whole and which will not prevent or delay the  consummation  of the
transactions contemplated hereby.

     Section 4.05 FINANCIAL STATEMENTS. AMBIA has delivered to Infodata copies
of the Financial  Statements.  The audited Financial Statements present fairly
the financial  position,  assets and  liabilities  of AMBIA as of December 31,
1996, and the results of the operation of AMBIA's business and changes in cash
flow for the eight (8) month period  ending  December 31, 1996.  The unaudited
Interim Financial Statements present fairly the financial position, assets and
liabilities of AMBIA as of June 30, 1997, respectively, and the results of the
operation  of AMBIA's  business  and  changes  in cash flow for the  six-month
period then ended.  The Financial  Statements have been prepared in conformity
with GAAP,  consistently applied during the periods. The Financial Statements,
including  the  notes  thereto,  make full and  adequate  disclosure  of,  and
provision for, all material obligations and liabilities of AMBIA to the extent
required  by  GAAP.  Except  as set  forth in the most  recent  balance  sheet
included in the Financial Statements, there are no liabilities,  debts, claims
or obligations,  whether accrued, absolute,  contingent or otherwise,  whether
due or to become due, which could cause an AMBIA Material  Adverse Change,  to
the extent  required by GAAP to be included in such balance  sheet.  Except as
set forth in EXHIBIT  4.05,  none of the  Financial  Statements  or  schedules
included therein, contain any untrue statement of a material


                                      10

<PAGE>

fact or omitted  to state a material  fact  required  to be stated  therein or
necessary in order to make the statements therein not misleading.

     Section 4.06 ABSENCE OF CERTAIN  CHANGES.  Except as set forth in EXHIBIT
4.06  attached  hereto,  since Marih e1, 1997,  AMBIA has not taken any of the
actions set forth in Section 6.01, suffered any AMBIA Material Adverse Changes
(other  than  changes  generally  affecting  the  industries  in  which  AMBIA
operates,  including  changes  due to actual  or  proposed  changes  in law or
regulation,  or changes  relating  to the  transactions  contemplated  by this
Agreement,  including  the change in control  contemplated  hereby) or entered
into any transaction,  or conducted its business or operations,  other than in
the ordinary and usual course of business and  consistent  with past  practice
and other than in connection with AMBIA's exploration of alternatives  leading
to the execution of this Agreement.

     Section 4.07 NO UNDISCLOSED LIABILITIES.  Except as and to the extent set
forth in the Financial  Statements,  AMBIA, at June 30, 1997, did not have any
material  liabilities  not reflected on the balance sheet of AMBIA included in
the  Interim  Financial  Statements.  Except as and to the extent set forth in
such  Financial  Statements,  since June 30, 1997,  through and  including the
Effective  Date,  AMBIA  has not  incurred  any  liabilities  material  to the
business,  operations or financial condition of AMBIA taken as a whole, except
liabilities  incurred  in the  ordinary  and  usual  course  of  business  and
consistent with past practice and any liabilities  incurred in connection with
this Agreement.

     Section  4.08  ACCURACY OF  STATEMENTS.  Neither this  Agreement  nor any
written statement,  list,  certificate or other information furnished by or on
behalf of AMBIA to Infodata in  connection  with this  Agreement or any of the
transactions  contemplated  hereby,  taken as a  whole,  contains  any  untrue
statement of a material  fact, or omits to state a material fact  necessary to
make the statements contained herein or therein, in light of the circumstances
in which they are made, not misleading.

     Section  4.09 NO DEFAULT.  Except as set forth in EXHIBIT  4.09  attached
hereto,  AMBIA is not in default or violation (and no event has occurred which
with  notice  or the  lapse of time or both  would  constitute  a  default  or
violation)  of any  term,  condition  or  provision  of (i)  its  articles  of
incorporation  or its  bylaws,  (ii)  any  note,  bond,  mortgage,  indenture,
license, contract,  agreement or other instrument or obligation to which AMBIA
is a party or by which it or any of its  properties  or assets may be bound or
(iii)  any  order,  writ,  injunction,  decree,  statute,  rule or  regulation
applicable to AMBIA,  which  defaults or violations  would,  in the aggregate,
result in an AMBIA Material Adverse Effect or which would  materially  prevent
or delay the consummation of the transactions contemplated hereby.

     Section 4.10  LITIGATION.  Except as  disclosed in EXHIBIT 4.10  attached
hereto, there is no action, suit,  proceeding,  review or, to the knowledge of
AMBIA,  investigation  pending  or,  to the  knowledge  of  AMBIA,  threatened
involving  AMBIA, at law or in equity,  or before any  Governmental  Authority
which in the aggregate are  reasonably  likely to result in an AMBIA  Material
Adverse Effect.


                                      11

<PAGE>

     Section 4.11  COMPLIANCE  WITH  APPLICABLE  LAW. AMBIA holds all permits,
licenses,  variances,  exemptions,  orders and  approvals of all  Governmental
Authorities  necessary  for the lawful  conduct of its  business  (the  "AMBIA
Permits"),  except for failures to hold such AMBIA Permits which would not, in
the  aggregate,  result  in an  AMBIA  Material  Adverse  Effect.  AMBIA is in
compliance  with the terms of AMBIA  Permits,  except  where the failure so to
comply would not result in an AMBIA Material Adverse Effect.  AMBIA's business
is not being  conducted in violation of any applicable law,  ordinance,  rule,
regulation,  decree  or  order  of  any  Governmental  Authority,  except  for
violations  which in the  aggregate  do not and would  not  result in an AMBIA
Material Adverse Effect.

     Section 4.12 TAXES; SECTION 355 SPIN-OFF AND TAX-FREE REORGANIZATION.

          (a) AMBIA has duly  filed all  material  federal,  state,  local and
foreign  tax  returns  required  to be filed by it,  and AMBIA has duly  paid,
caused to be paid or made  adequate  provision  for the  payment  of all Taxes
required to be paid in respect of the periods  covered by such returns and has
made adequate  provision for payment of all Taxes anticipated to be payable in
respect of all taxable  periods since the periods  covered by such returns and
ending with the Effective  Date.  To the best of the  knowledge of AMBIA,  the
Shareholders  and SPI, none of the income tax returns  required to be filed by
AMBIA with  Governmental  Authorities has ever been examined by the government
agencies responsible for auditing such returns, and no period during which any
assessments  may be made by such  agencies with respect to such returns or any
Taxes due to such Governmental  Authorities has expired. No issue or claim has
been  asserted for Taxes by any taxing  authority  for any prior  period,  the
adverse determination of which would result in a deficiency which would result
in an AMBIA  Material  Adverse  Effect.  Except as set forth in  EXHIBIT  4.12
attached hereto, there are no outstanding  agreements or waivers extending the
statutory period of limitation applicable to any income tax return of AMBIA.

          (b) Prior to  commencing  negotiations  with  Infodata in connection
with the Merger and the transactions contemplated under this Agreement, AMBIA,
SPI and the Shareholders  consummated the tax-free  spin-off of AMBIA stock by
SPI to the  Shareholders  under  Section  355 of the  Code  (the  "Spin-Off"),
pursuant  to the  Agreement  and Plan of  Reorganization  dated  May 1,  1996,
approved and adopted by SPI's Board of Directors and shareholders by unanimous
consents,  dated May 1, 1996. SPI, AMBIA and each of the Shareholders  further
represent and warrant that; (i) all of the requirements imposed by Section 355
of the Code and the underlying regulations, including, without limitation, the
business purpose,  continuity of interest,  continuity of business enterprise,
active trade or business and device tests,  were satisfied in connection  with
the Spin-Off;  and (ii) all of the requirements imposed by Sections 368(a) and
(b) of the Code and the underlying regulations, including, without limitation,
the  business  purpose,  continuity  of interest  and  continuity  of business
enterprise  tests shall be satisfied on the Effective Date in connection  with
the  Merger  and  the  transactions   contemplated  by  this  Agreement.   The
Shareholders  and SPI shall  execute  tax  representation  letters in the form
attached  hereto as EXHIBIT  7.03(f)-1,  in connection  with the opinion to be
given by Infodata's  counsel  under  Section  7.03(f)  hereof  concerning  the
tax-free treatment of the transactions contemplated by this Agreement.


                                      12

<PAGE>

     Section 4.13 ERISA.

          (a) With respect to each employee benefit plan  (including,  without
limitation, any "employee benefit plan", as defined in Section 3(3) of ERISA),
and any  material  bonus,  pension,  profit  sharing,  deferred  compensation,
incentive compensation, stock ownership, stock purchase, stock option, phantom
stock,   retirement,   vacation,   severance,   disability,   death   benefit,
hospitalization,   insurance  or  other  plan,  arrangement  or  understanding
(whether or not legally  binding) (all the  foregoing  being herein called the
"AMBIA Benefit Plans"),  maintained or contributed to by AMBIA, AMBIA has made
available to Infodata a true and correct copy of,  where  applicable,  (i) the
most recent  annual  report  (Form  5500) filed with the IRS,  (ii) such AMBIA
Benefit Plan, (iii) each trust agreement and group annuity  contract,  if any,
relating to such AMBIA Benefit Plan and (iv) the most recent  actuarial report
or  valuation  relating to a AMBIA  Benefit Plan subject to Title IV of ERISA.
None of the AMBIA Benefit Plans are multiemployer  plans within the meaning of
Section  3(37) of ERISA.  Each of the AMBIA Benefit Plans covered by ERISA (a)
has been operated in all material  respects in accordance with ERISA,  (b) has
not engaged in any prohibited transactions (as such term is defined in Section
406 of ERISA) and (c) has met the minimum funding  standards of Section 412 of
the Code. No material  reportable event (within the meaning of Section 4043 of
ERISA) has occurred and is continuing with respect to any such Plan. AMBIA has
never terminated any pension plan or withdrawn from any multiemployer  pension
plan.

          (b) With respect to AMBIA Benefit Plans, in the aggregate,  no event
has occurred, and to the knowledge of AMBIA or the Shareholders,  there exists
no condition or set of circumstances  which are reasonably  likely to occur in
connection  with which  AMBIA  would be subject to any  liability,  that would
result in an AMBIA  Material  Adverse  Effect  (except  liability for benefits
claims and funding obligations  payable in the ordinary course),  under ERISA,
the Code or any other applicable law.

          (c)  Except as set  forth in  EXHIBIT  4.13  attached  hereto,  with
respect to AMBIA Benefit Plans, in the aggregate,  there are no funded benefit
obligations for which contributions have not been made or properly accrued and
there are no unfunded benefit obligations which have not been accounted for by
reserves,  or  otherwise  properly  footnoted in  accordance  with GAAP on the
Financial Statements,  which obligations are reasonably likely to result in an
AMBIA Material Adverse Effect.

     Section 4.14 INTELLECTUAL PROPERTY.

          (a) EXHIBIT 4.14 is an accurate and complete  list of all of AMBIA's
Intellectual  Property,  and reflects AMBIA's  Intellectual  Property that has
been duly and properly  registered  in any  jurisdiction.  Except as otherwise
specified in EXHIBIT 4.14, AMBIA owns, has the right to use,


                                      13

<PAGE>

sell,  license,  dispose of, and to bring actions for the  misappropriation of
AMBIA's Intellectual Property, and to the best of SPI's, the Shareholders' and
its  knowledge,  without any conflict  with or  infringement  of the rights of
others,  free  and  clear  of all  liens,  charges  or  encumbrances  or other
restrictions of any kind.

          (b) AMBIA has taken  reasonable  steps to safeguard and maintain the
secrecy and  confidentiality  of, and protect its  proprietary  rights in, its
Intellectual Property.

          (c) Except as set forth in EXHIBIT 4.14  attached  hereto and to the
knowledge of AMBIA, no claim is pending or, to the knowledge of AMBIA,  SPI or
the Shareholders, threatened to the effect that the present or past operations
of AMBIA  infringe  upon or conflict with the rights of others with respect to
any Intellectual  Property and no claim is pending or threatened to the effect
that any of the Intellectual Property is invalid or unenforceable.  To AMBIA's
knowledge, no contract, agreement or understanding with any party exists which
would  materially  impede or prevent the  continued use by AMBIA of the entire
right, title and interest of AMBIA in and to the Intellectual Property.

     Section  4.15  CHANGE IN  CONTROL.  Except as set forth in EXHIBIT  4.15,
AMBIA  is not a  party  to any  contract,  agreement  or  understanding  which
contains a "change in  control"  provision  or  "potential  change in control"
provision.

     Section 4.16 BROKERS;  FINDERS.  Neither AMBIA,  SPI nor the Shareholders
have  retained  any  broker  or  finder in  connection  with the  transactions
contemplated  herein so as to give rise to any valid  claim  against  AMBIA or
Infodata   for  any   brokerage  or  finder's   commission,   fee  or  similar
compensation.

     Section  4.17  OPERATIONS  OF AMBIA.  Except as set forth in EXHIBIT 4.17
attached hereto, AMBIA has not since March 31, 1997:

          (a) amended its articles of  incorporation  or bylaws or merged with
or into or  consolidated  with  any  other  person,  subdivided  or in any way
reclassified any shares of its capital stock or changed or agreed to change in
any manner the rights of its outstanding capital stock or the character of its
business;

          (b)  issued or sold or  purchased,  or issued  options  or rights to
subscribe to, or entered into any contracts or commitments to issue or sell or
purchase, any shares of its capital stock;

          (c) waived any right of material value to its business which in each
instance is worth in excess of $10,000.00 or in the aggregate is worth greater
than $25,000.00;

          (d) made any change in its  accounting  methods or practices or made
any change in depreciation or amortization policies or rates adopted by it;


                                      14

<PAGE>

          (e)  made  any  payment  or  commitment  to  pay  any  severance  or
termination  pay to any of its officers,  directors,  employees,  consultants,
agents or other representatives;

          (f) entered into any lease (as lessor or lessee), sold, abandoned or
made any other disposition of any of its tangible assets,  granted or suffered
any lien or other encumbrance on any of its assets or properties, entered into
or amended any contract or other agreement to which it is a party, or by or to
which it or its assets or  properties  are bound or  subject,  or  pursuant to
which it agrees to indemnify any party or to refrain from  competing  with any
party, in each instance, worth more than $10,000.00;

          (g) except for property or equipment acquired in the ordinary course
of  business,  made  any  acquisition  of  all  or any  part  of  the  assets,
properties,  capital stock or business of any other  Person,  which is in each
instance valued at more than  $10,000.00,  or in the aggregate  valued at more
than $25,000.00;

          (h) paid,  directly or indirectly,  any of its material  liabilities
before the same became due in accordance  with its terms or otherwise  than in
the ordinary course of business;

          (i) suffered or incurred any damage, destruction or loss (whether or
not covered by insurance)  constituting  an AMBIA  Material  Adverse Effect or
Change;

          (j) entered into any other material  contract or other  agreement or
other material transaction; or

          (k) been advised or otherwise  become aware that any of its existing
contracts  for the  performance  of  services or the license of any portion of
AMBIA's  Intellectual  Property is to be terminated or substantially  modified
other than in accordance with its terms or as reflected in EXHIBIT 4.17.

     Section 4.18  INSURANCE.  EXHIBIT 4.18 attached hereto is an accurate and
complete list of all policies of fire, liability, workers' compensation, title
and other forms of insurance owned,  held by or applicable to AMBIA, and AMBIA
has  heretofore  delivered  to Infodata a true and  complete  copy of all such
policies,  including all occurrence-based policies applicable to AMBIA for all
periods  prior to the Effective  Date. To the knowledge of each of AMBIA,  SPI
and the  Shareholders,  there are no pending claims of AMBIA under any of such
policies;  such policies (and binders,  if any), are valid and  enforceable in
accordance  with  their  terms and are in full force and  effect;  and all the
insurable  properties and assets of AMBIA are insured for AMBIA's benefit,  in
amounts and coverages deemed adequate by the AMBIA's  management,  against all
risks usually  insured  against by persons  operating  similar  properties and
assets in the localities  where such  properties or assets are located,  under
valid  and   enforceable   policies   issued   by   insurers   of   recognized
responsibility.

     Section 4.19 CONTINUITY OF BUSINESS  ENTERPRISE.  AMBIA operates at least
one historic line of business,  or owns at least a significant  portion of its
business assets, in each case within the


                                      15

<PAGE>

meaning of Treasury Regulation ss.1.368-1(d).  Neither AMBIA nor SPI has taken
or agreed to take any action that would prevent the Merger from constituting a
tax-free  reorganization  qualifying under the provisions of Section 368(a) of
the Code.

     Section 4.20 IMPROPER AND OTHER PAYMENTS. To the best knowledge of AMBIA,
SPI and the Shareholders,  except as set forth in EXHIBIT 4.20, none of AMBIA,
any of its directors, officers, employees, agents or representatives,  nor any
Person  acting on behalf of any of them,  has made,  paid or received  (a) any
bribes,  kickbacks or other  similar  payments to or from any Person,  whether
lawful or  unlawful,  (b) any  contributions,  directly  or  indirectly,  to a
domestic or foreign  political party or candidate or (c) any improper  foreign
payment (as defined in the U.S. Foreign Corrupt Practices Act).

     Section 4.21 ADDITIONAL SHAREHOLDER AND SPI REPRESENTATIONS.
                     

          (a) Each  Shareholder  and SPI severally and not jointly  represents
that such Shareholder and SPI has not purchased, sold, exchanged,  transferred
by gift or otherwise  disposed of AMBIA Shares prior to the date hereof either
in contemplation of or as part of the Merger or otherwise.

          (b) Each Shareholder severally and not jointly represents that he is
aware of (i) the  limitations  on resale of the  Infodata  Shares and (ii) the
fact that he is receiving the Infodata Shares without  registration  under the
Securities  Act in reliance on the exemption  from  registration  contained in
Section  4(2) of the  Securities  Act,  which  Shares are being  acquired  for
investment  and without any view to the sale,  resale,  or other  distribution
thereof in any manner that is in violation of the Securities Act.

          (c)  None of the  Shareholders  or any of  their  Affiliates  has or
claims to have any direct or indirect  interest in any tangible or  intangible
property used in AMBIA's business, except as a holder of the AMBIA Shares. The
Shareholders are the sole and exclusive holders of all the outstanding  shares
of  capital  stock  of  AMBIA.  Each  Shareholder  severally  and not  jointly
represents that, except as disclosed on EXHIBIT 4.21(c) attached hereto,  none
of the  Shareholders  nor any of their  Affiliates  has any direct or indirect
interest in any other  Person  which  conducts a business  similar to, has any
contract or arrangement with, or does business or is involved in any way with,
AMBIA.  EXHIBIT  4.21(c)  contains a complete and accurate  description of all
such Persons, interests, arrangements and other matters.

          (d) Each  Shareholder  is capable of evaluating the merits and risks
of the  investment  in Infodata  Shares,  has the  capacity to protect his own
respective interests, and has the financial ability to bear the economic risks
of the investment.

          (e) Each Shareholder has had ample opportunity to discuss Infodata's
business,  management  and  financial  affairs  with  its  management  and the
opportunity to review in detail Infodata's property, books, accounts, records,
contracts and documents and all other information


                                      16

<PAGE>

related  to  such   Shareholder's   investment   in  Infodata   Shares.   Such
Shareholder's  questions pertaining to Infodata were answered fully and to the
Shareholder's satisfaction.

          (f)  Each  Shareholder  shall  not  sell,  pledge,   hypothecate  or
otherwise  transfer  any Infodata  Shares  unless it is  registered  under the
Securities Act and applicable  state  securities laws or is exempt  therefrom.
Each  Shareholder  acknowledges  that each certificate  representing  Infodata
Shares  shall  be  endorsed  with a legend  which  provides  substantially  as
follows:

     "The  securities  evidenced  hereby  have not been  registered  under the
     Securities   Act  of  1933,  as  amended,   or  the  laws  of  any  other
     jurisdiction,  and may not be sold,  transferred,  assigned,  pledged  or
     otherwise distributed unless there is an effective registration statement
     under such Act and applicable  securities laws covering such  securities,
     or such sale, transfer, assignment, pledge or distribution is exempt from
     registration  under such Act and  applicable  securities  laws.  Infodata
     Systems  Inc.  may  require an  opinion of counsel  for the holder of the
     securities  (concurred  in by counsel for Infodata  Systems Inc.) stating
     that such sale,  transfer,  assignment,  pledge or distribution is exempt
     from registration under such Act and applicable securities laws."

          (g) Each  Shareholder  shall vote in favor of the  Agreement and the
transactions  contemplated  herein at the  shareholders'  meeting described in
Section 6.06 hereof.

          (h)  Each  Shareholder   represents  and  warrants  that  he  is  an
"accredited investor," as that term is defined under Rule 501(a) of Regulation
D, promulgated under the Securities Act.

          (i) None of the  Shareholders has taken or agreed to take any action
that would  prevent the Merger  from  constituting  a tax-free  reorganization
qualifying under the provisions of Section 368(a) of the Code.

          (j) Each of the Shareholders has no present  intention to dispose of
any of the  Infodata  Shares  to be  issued in the  Merger,  unless  otherwise
permitted under federal or state securities or tax laws.

     Section 4.22 ACCOUNTS RECEIVABLE. The total accounts receivable of AMBIA,
net of allowances for doubtful accounts,  as of June 30, 1997, as shown on the
Interim Financial Statements, shall be at least $50,000.00. In the event AMBIA
collects  less than  $50,000.00  of such  accounts  receivable  within six (6)
months after the Effective  Date,  the Escrow Agent shall reduce the number of
Escrow Shares to be delivered to the Shareholders and shall return such shares
to Infodata  (as set forth in Section  10.01(b)  hereof) by an amount equal to
(a) the  difference  between  $50,000.00  and  the  amount  of  such  accounts
receivable  actually  collected in the  six-month  period,  divided by (b) the
average  of the  closing  sale  prices  of the  Common  Stock for the ten (10)
Business Days ending on the Effective Date.  Notwithstanding the foregoing, at
the  option  of  either  or both of the  Shareholders,  either  or both of the
Shareholders  may transfer cash to AMBIA or its successor in interest to avoid
any such return of Escrow Shares to Infodata.  In such an event and in lieu of
returning  all or a portion of such Escrow  Shares to  Infodata,  AMBIA or its
successor shall assign


                                      17

<PAGE>

AMBIA's  rights  to  receive  the  uncollected  accounts  receivable  to  such
Shareholder(s) upon receipt and to the extent of any such cash payment.


                                   ARTICLE V

                       REPRESENTATIONS AND WARRANTIES OF
                           INFODATA AND ACQUISITION

     Infodata  and  Acquisition  represent  and warrant to AMBIA,  SPI and the
Shareholders  as of the  date  of this  Agreement  and on the  Effective  Date
(except as otherwise provided herein) as follows:

     Section  5.01  ORGANIZATION.  Each  of  Infodata  and  its  subsidiaries,
including Acquisition,  is a corporation duly organized,  validly existing and
in good standing under the laws of the jurisdiction of its  incorporation  and
has all requisite power and authority to own, lease and operate its properties
and to carry on its business as now being conducted.  Each of Infodata and its
subsidiaries is duly qualified or licensed and in good standing to do business
in each jurisdiction in which the property owned,  leased or operated by it or
the  nature  of the  business  conducted  by it makes  such  qualification  or
licensing  necessary,  except in such jurisdictions where the failure to be so
duly  qualified or licensed and in good  standing  would not in the  aggregate
result  in an  Infodata  Material  Adverse  Effect.  Infodata  has  heretofore
delivered  to  AMBIA   accurate  and  complete   copies  of  the  articles  of
incorporation and bylaws, as currently in effect, of Infodata and Acquisition.

     Section 5.02 CAPITALIZATION. (a) The authorized capital stock of Infodata
consists of: (i) 6,666,666  authorized shares of common stock, par value, $.03
per share ("Infodata Common Stock"), of which, as of June 30, 1997,  2,320,208
shares were issued and  outstanding;  and (ii)  500,000  authorized  shares of
preferred  stock,  par value $1.00 per share,  none of which shares are issued
and  outstanding.  All the issued and  outstanding  shares of Infodata  Common
Stock are validly issued,  fully paid and nonassessable and free of preemptive
rights.  All Infodata  Shares which are to be issued pursuant to the Merger or
the other transactions contemplated hereby, will be, when issued in accordance
with the respective terms thereof, duly authorized, validly issued, fully paid
and nonassessable and free of any preemptive rights in respect thereto.  As of
June 30,  1997,  a total of  1,048,839  shares of Infodata  Common  Stock were
issuable  upon the  exercise of options or  warrants  that have been or may be
granted by Infodata  pursuant to Infodata's 1995 Stock Option Plan, 1987 Stock
Warrant  Purchase Plan and other stock option and warrant  purchase  plans and
agreements.  Further,  Infodata's  Board of  Directors  has  approved the 1997
Employee  Stock  Purchase  Plan (the  "SPP"),  pursuant to which  Infodata has
reserved  up to  200,000  shares of  Infodata  Common  Stock for  issuance  to
eligible employees. The SPP has been approved by Infodata's shareholders,  and
no shares have been issued  under such plan as of the date of this  Agreement.
Other than such  options  and  warrants,  no Person  has any right  (including
preemptive rights) to acquire any shares of Infodata Common Stock.


                                      18

<PAGE>

          (b) EXHIBIT 5.02 attached  hereto sets forth the name,  jurisdiction
of incorporation and capitalization of each subsidiary of Infodata.  Except as
disclosed in EXHIBIT 5.02, Infodata does not own, directly or indirectly,  any
capital stock or other equity securities of any corporation or have any direct
or  indirect  equity  or  ownership  interest  in  any  business.  All  of the
outstanding  shares of capital stock of each of Infodata's  subsidiaries  have
been validly issued and are fully paid and  nonassessable  and,  except as set
forth in  EXHIBIT  5.02,  are owned by  Infodata  free and clear of all liens,
charges, claims or encumbrances.  Other than such capital stock, no Person has
any right (including preemptive rights) to acquire any shares of capital stock
or equity securities in any of Infodata's subsidiaries.

     Section 5.03 AUTHORITY  RELATIVE TO THIS AGREEMENT.  Each of Infodata and
Acquisition has full corporate power and authority to execute and deliver this
Agreement  and  to  consummate  the  transactions   contemplated  hereby.  The
execution  and  delivery  of  this  Agreement  and  the  consummation  of  the
transactions  contemplated hereby have been duly and validly authorized by the
Board of  Directors of Infodata  and  Acquisition  and by Infodata as the sole
stockholder of Acquisition and no other  corporate  proceedings on the part of
Infodata or  Acquisition  are  necessary  to  authorize  this  Agreement or to
consummate the transactions so contemplated.  This Agreement has been duly and
validly  executed  and  delivered  by each of  Infodata  and  Acquisition  and
constitutes a valid and binding agreement of each of Infodata and Acquisition,
enforceable  against each of Infodata and  Acquisition in accordance  with its
terms.

     Section 5.04 CONSENTS AND APPROVALS; NO VIOLATIONS. Except for applicable
requirements of the Exchange Act, Securities Act, state Blue Sky laws, and the
filing  and  recordation  of an  Agreement  of  Merger,  as  required  by  the
California  Corporations  Code, and a Certificate of Merger, as required under
Delaware  law,  no filing  with,  and no  permit,  authorization,  consent  or
approval of, any Governmental  Authority, is necessary for the consummation by
Infodata of the  transactions  contemplated by this  Agreement.  Except as set
forth in EXHIBIT 5.04 attached  hereto,  neither the execution and delivery of
this Agreement by Infodata or Acquisition nor the  consummation by Infodata or
Acquisition of the transactions contemplated hereby nor compliance by Infodata
or  Acquisition  with any of the  provisions  hereof will (i) conflict with or
result in any breach of any  provision  of the  articles of  incorporation  or
bylaws of Infodata or Acquisition, (ii) result in a violation or breach of, or
constitute (with or without due notice or lapse of time or both) a default (or
give rise to any right of termination,  cancellation or  acceleration)  under,
any of the  terms,  conditions  or  provisions  of any note,  bond,  mortgage,
indenture,  license, contract,  agreement or other instrument or obligation to
which Infodata or any of its  subsidiaries  is a party or by which any of them
or any of their  properties or assets may be bound or (iii) violate any order,
writ, injunction,  decree,  statute,  treaty, rule or regulation applicable to
Infodata, any of its subsidiaries or any of their properties or assets, except
in the case of (ii) or (iii) for  violations,  breaches or defaults  which are
not  in the  aggregate  material  to the  business,  operations  or  financial
condition of Infodata and its subsidiaries taken as a whole and which will not
prevent or delay the consummation of the transactions contemplated hereby.


                                      19

<PAGE>

     Section 5.05 REPORTS. Except as provided in EXHIBIT 5.05 attached hereto,
Infodata has timely filed all required  forms,  reports and documents with the
SEC since December 31, 1995 (collectively, the "Infodata SEC Reports"), all of
which have complied with all applicable requirements of the Securities Act and
the Exchange Act, and copies of which have been supplied to AMBIA.

     Section  5.06  ACCURACY OF  STATEMENTS.  Neither this  Agreement  nor any
statement, list, certificate or other information furnished or to be furnished
by or on behalf of Infodata to AMBIA in connection  with this Agreement or any
of the transactions  contemplated hereby,  taken as a whole,  contains or will
contain any untrue  statement  of a material  fact  regarding  Infodata or the
Infodata's business,  or omits or will omit to state a material fact necessary
to make the statements  regarding  Infodata or Infodata's  business  contained
herein or therein,  in light of the  circumstances in which they are made, not
misleading.

     Section 5.07 NO UNDISCLOSED LIABILITIES.  Except as and to the extent set
forth  in  the  Infodata  SEC  Reports,   neither  Infodata  nor  any  of  its
subsidiaries had at December 31, 1996, any liabilities  required by GAAP to be
reflected on a  consolidated  balance sheet of Infodata and its  subsidiaries.
Except as and to the extent set forth in such Infodata SEC Reports, since such
date and through and including the Effective Date, neither Infodata nor any of
its  subsidiaries  has  incurred  any  liabilities  material to the  business,
operations or financial  condition of Infodata and its subsidiaries taken as a
whole,  except  liabilities  incurred  in the  ordinary  and  usual  course of
business  and  consistent  with past  practice  and  liabilities  incurred  in
connection with this Agreement.

     Section  5.08 NO DEFAULT.  Except as set forth in EXHIBIT  5.08  attached
hereto,  neither  Infodata  nor  any  of its  subsidiaries  is in  default  or
violation (and no event has occurred which with notice or the lapse of time or
both  would  constitute  a default or  violation)  of any term,  condition  or
provision of (i) its articles of incorporation  or its bylaws,  (ii) any note,
bond, mortgage, indenture, license, contract, agreement or other instrument or
obligation to which Infodata or any of its subsidiaries is a party or by which
they or any of their  properties  or assets  may be bound or (iii) any  order,
writ, injunction,  decree,  statute, rule or regulation applicable to Infodata
or any  of its  subsidiaries,  which  defaults  or  violations  would,  in the
aggregate,  result in an  Infodata  Material  Adverse  Effect  or which  would
prevent or delay the consummation of the transactions contemplated hereby.

     Section 5.09 LITIGATION.  Except as disclosed in the Infodata SEC Reports
or in EXHIBIT 5.09  attached  hereto,  there is no action,  suit,  proceeding,
review or, to the best  knowledge  of Infodata or  Acquisition,  investigation
pending  or, to the best  knowledge  of Infodata  or  Acquisition,  threatened
involving Infodata or any of its subsidiaries,  at law or in equity, or before
any  Governmental  Authority  which in the aggregate are reasonably  likely to
result in an Infodata Material Adverse Effect.

     Section  5.10  COMPLIANCE   WITH   APPLICABLE   LAW.   Infodata  and  its
subsidiaries hold all permits,  licenses,  variances,  exemptions,  orders and
approvals of all Governmental Authorities


                                      20

<PAGE>

necessary for the lawful conduct of their  respective  business (the "Infodata
Permits"),  except for failures to hold such Infodata Permits which would not,
in the aggregate, constitute an Infodata Material Adverse Effect. Infodata and
its  subsidiaries  are in compliance  with the terms of the Infodata  Permits,
except where the failure so to comply would not result in an Infodata Material
Adverse Effect.  The businesses of Infodata and its subsidiaries are not being
conducted in violation of any applicable  law,  ordinance,  rule,  regulation,
decree or order of any Governmental Authority,  except for violations which or
in the aggregate do not and would not result in an Infodata  Material  Adverse
Effect.

     Section 5.11  BROKERS;  FINDERS.  Infodata has not retained any broker or
finder in connection with the transactions  contemplated  herein so as to give
rise to any valid  claim for any  brokerage  or  finder's  commission,  fee or
similar compensation.

     Section  5.12  CONTINUITY  OF  BUSINESS  ENTERPRISE.  It is  the  present
intention  of  Infodata to continue  at least one  historic  business  line of
AMBIA, or to use at least a significant  portion of AMBIA's historic  business
assets in a business,  in each case within the meaning of Treasury  Regulation
ss.1.368-1(d).  Neither  Infodata nor  Acquisition has taken or agreed to take
any  action  that  would  prevent  the  Merger  from  constituting  a tax-free
reorganization qualifying under the provisions of Section 368(a) of the Code.

     Section 5.13 INTERIM  OPERATIONS OF  ACQUISITION.  Acquisition was formed
solely for the purpose of engaging in the  transactions  contemplated  hereby,
has engaged in no other  business  activities and has conducted its operations
only as contemplated hereby.


                                  ARTICLE VI

                                   COVENANTS

     Section 6.01 COVENANTS OF AMBIA.  During the period from the date of this
Agreement and continuing  until the Effective Date,  AMBIA agrees that (except
as expressly  contemplated  or permitted by this  Agreement,  or to the extent
that the other party shall otherwise consent in writing):

          (a) AMBIA  shall  carry on its  business  in the usual,  regular and
ordinary  course,  consistent  with past  practice,  and use its best efforts,
consistent  with past  practice,  to  preserve  intact  its  present  business
organization,  maintain its corporate existence and good standing in its state
of  incorporation,  keep  available  the services of its present  officers and
employees and preserve its relationships with customers,  suppliers and others
having business dealings with it.

          (b) AMBIA shall not, nor shall it propose to, (i) declare, set aside
or pay any dividend or other distribution  (whether in cash, stock or property
or any  combination  thereof)  in respect of any of its  capital  stock,  (ii)
split, combine or reclassify any of its capital stock or issue or authorize or
propose the issuance of any other securities in respect of, in lieu of or in


                                      21

<PAGE>

substitution  for shares of its capital stock or (iii)  repurchase,  redeem or
otherwise acquire any of its securities.

          (c) AMBIA shall not authorize for issuance,  issue, sell, deliver or
agree or commit to issue,  sell or deliver  (whether  through the  issuance or
granting of options, warrants, commitments,  subscriptions, rights to purchase
or  otherwise)  any  stock of any  class or any  other  securities  (including
indebtedness  having  the  right to vote) or  equity  equivalents  (including,
without limitation, stock appreciation rights), except as required pursuant to
the agreements and instruments outstanding on the date hereof and disclosed in
Section  4.02,  or amend in any material  respect any of the terms of any such
securities  or  agreements  outstanding  on the date  hereof,  other  than the
issuance of shares of AMBIA  capital  stock upon the exercise of stock options
pursuant  to the  AMBIA  Equity  Incentive  Plan  and  upon  the  exercise  or
conversion  of  other  AMBIA  options,   warrants  or  rights,  in  each  case
outstanding on the date of this Agreement and in accordance with their present
terms.

          (d) AMBIA  shall  not amend or  propose  to amend  its  articles  of
incorporation or bylaws.

          (e) AMBIA shall not  acquire,  sell,  lease,  encumber,  transfer or
dispose of any assets outside the ordinary course of business, consistent with
past  practice,  or any assets  which are  material to AMBIA taken as a whole,
except pursuant to obligations in effect on the date hereof, or enter into any
commitment or transaction outside the ordinary course of business,  consistent
with past practice.

          (f) AMBIA shall not incur any  indebtedness  for  borrowed  money or
guarantee  any such  indebtedness  or issue  or sell  any debt  securities  or
warrants or rights to acquire any debt  securities  of AMBIA or guarantee  (or
become  liable for) any debt of others or make any loans,  advances or capital
contributions or mortgage, pledge or otherwise encumber any material assets or
create or suffer any material  lien  thereupon  other than in each case in the
ordinary course of business consistent with prior practice.

          (g)  AMBIA  shall  not  pay,   discharge   or  satisfy  any  claims,
liabilities  or  obligations  (absolute,   accrued,  asserted  or  unasserted,
contingent or otherwise), other than the payment, discharge or satisfaction in
the ordinary course of business consistent with past practice or in accordance
with  their  terms,  of  liabilities  reflected  or  reserved  against  in, or
contemplated  by, the Financial  Statements or incurred in the ordinary course
of business consistent with past practice.

          (h) AMBIA  shall not  change  any of the  accounting  principles  or
practices used by it (except as required by GAAP).

          (i) AMBIA  shall not agree to take any of the  foregoing  actions or
knowingly take or agree to take any action that would or is reasonably  likely
to result in any of its representations


                                      22

<PAGE>

and  warranties  set  forth in this  Agreement  being  untrue or in any of the
conditions to the Merger set forth in Article VII not being satisfied.

          (j) AMBIA shall give  Infodata  prompt notice of: (a) any notice of,
or other  communication  relating to, a default or event which, with notice or
the  lapse of time or both,  would  become a  default,  if  received  by AMBIA
subsequent  to the date of this  Agreement  and prior to the  Effective  Time,
under  any  agreement,  indenture  or  instrument  material  to the  financial
condition,  properties, business or results of operations of AMBIA, taken as a
whole,  to which  AMBIA  is a party or is  subject;  (b) any  notice  or other
communication  from any third  party  alleging  that the consent of such third
party is or may be required in connection with the  transactions  contemplated
by  this   Agreement,   which   consent,   if   required,   would  breach  the
representations  contained in Article IV; and (c) any AMBIA  Material  Adverse
Change.

          (k) During the period from the date of this Agreement and continuing
until the  Effective  Time,  AMBIA agrees that it will not,  without the prior
written  consent  of  Infodata,  except  as  contemplated  by this  Agreement,
including Section 6.11 hereof, or required by law (i) enter into, adopt, amend
or  terminate  any AMBIA  Benefit Plan or other  employee  benefit plan or any
agreement,  arrangement,  plan or policy  between AMBIA and one or more of its
directors  or  executive  officers or (ii) except for normal  increases in the
ordinary  course of  business  consistent  with  past  practice  that,  in the
aggregate,  do not result in a material  increase in benefits or  compensation
expense to AMBIA,  increase in any manner the  compensation or fringe benefits
of any  director,  officer or employee or pay any benefit not  required by any
plan and  arrangement  as in  effect as of the date  hereof or enter  into any
contract, agreement, commitment or arrangement to do any of the foregoing.

          (l) Immediately  prior to the Effective  Time,  AMBIA shall take all
actions  reasonably  necessary to convert each  unexercised  option to acquire
shares  of  AMBIA  common  stock  outstanding  pursuant  to the  AMBIA  Equity
Incentive Plan (whether or not such options are then exercisable) into options
to purchase Infodata Common Stock, as set forth in Section 6.11 hereof.

     Section 6.02 PRESS RELEASES.  From the date of this Agreement through and
including the Effective Date, the parties shall consult with each other before
issuing any press releases or otherwise making public  statements with respect
to the  transactions  contemplated  hereby and in making any filings  with any
Governmental Authority with respect thereto.

     Section 6.03 NO  SOLICITATION.  Neither AMBIA nor any of its  Affiliates,
officers, directors,  representatives or agents shall, directly or indirectly,
solicit,  initiate or encourage  (including by way of furnishing  information)
any person,  entity or group concerning any merger, sale of substantial assets
outside the ordinary  course of business,  sale of shares of capital  stock or
similar transaction involving AMBIA (other than the transactions  contemplated
by this Agreement). AMBIA shall promptly advise Infodata of any such inquiries
or proposals  it receives  from third  parties.  If the Closing does not occur
within  thirty  (30)  days of the date of  execution  of this  Agreement  (the
"Non-Solicitation Date"), SPI, AMBIA and the Shareholders on the one


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<PAGE>

hand, and Infodata and Acquisition on the other hand, agree that they will not
solicit for employment or encourage to leave employment, in each case, whether
as an  employee,  agent or  representative,  any  Person  who was  during  the
six-month  period  prior to the  Non-Solicitation  Date an officer,  employee,
agent or representative  of any of the other parties,  for a period of one (1)
year following the Non-Solicitation Date.

     Section 6.04 ACCESS TO INFORMATION. Upon reasonable notice and subject to
restrictions  contained in  confidentiality  agreements to which such party is
subject (from which such party shall use  reasonable  efforts to be released),
AMBIA and  Infodata  shall  each (and  shall  cause  each of their  respective
subsidiaries to) afford to the officers, employees,  accountants,  counsel and
other  representatives  of the other,  access,  during normal  business  hours
during the period prior to the Effective  Time,  to its pertinent  properties,
books,  contracts,  commitments and records and,  during such period,  each of
AMBIA and  Infodata  shall  furnish  promptly  to the  other  all  information
concerning  its  business,  properties  and  personnel as such other party may
reasonably  request.  Unless  otherwise  required by law or court  order,  the
parties will hold any such information  which is nonpublic in confidence until
such time as such information  otherwise becomes publicly available through no
wrongful  act of  either  party,  and in the  event  of  termination  of  this
Agreement  for any  reason  each party  shall  promptly  return all  nonpublic
documents  obtained from any other party,  and any copies or summaries made of
such documents, to such other party.

     Section 6.05 BEST  EFFORTS.  Subject to the terms and  conditions of this
Agreement,  each of the parties  hereto agrees to use its best efforts to have
the Closing  occur by August 15, 1997, or as soon as  practicable  thereafter,
and to take,  or cause to be  taken,  all  actions,  and to do, or cause to be
done, all things  necessary,  proper or advisable  under  applicable  laws and
regulations to consummate and make effective the transactions  contemplated by
this  Agreement  including,  without  limitation,  (i) such  actions as may be
required to be taken under  applicable  state  securities  or Blue Sky laws in
connection with the issuance of Infodata Shares contemplated  hereby, and (ii)
the  preparation  and filing of all other  forms,  registrations  and  notices
required to be filed to consummate the  transactions  contemplated  hereby and
the taking of such actions as are necessary to obtain any requisite approvals,
consents,  orders,  exemptions,  waivers by any public or private third party.
Each party shall promptly  consult with the other with respect to, provide any
necessary  information  with respect to and provide the other (or its counsel)
copies of, all filings made by such party with any  Governmental  Authority in
connection with this Agreement and the transactions contemplated hereby.

     Section 6.06 SHAREHOLDERS MEETING. AMBIA shall duly call, give notice of,
convene and hold a meeting of its  shareholders as promptly as practicable for
the purpose of voting upon this  Agreement and the  transactions  contemplated
herein.  AMBIA  will,  through  its  Board  of  Directors,  recommend  to  its
shareholders  approval of such matters and will  coordinate and cooperate with
respect to the timing of such  meeting and shall use its best  efforts to hold
such meeting on the same day or as soon as practicable  after the date hereof,
and shall use its best  efforts to secure the approval of this  Agreement  and
the transactions  contemplated  herein,  subject to its fiduciary duties under
applicable law.


                                      24

<PAGE>

     Section 6.07 CONTACT CLIENTS.  AMBIA shall permit Infodata,  and Infodata
shall have the right to contact,  subject to  reasonable  conditions,  AMBIA's
clients  under  contract with AMBIA and to make  reasonable  inquiries of such
clients;  provided,  however,  that Infodata  shall provide AMBIA with advance
notice of any such contact and shall permit AMBIA to  participate  in any such
contacts with AMBIA's clients.

     Section 6.08 NOTICE REGARDING CHANGE IN  CIRCUMSTANCES.  AMBIA shall give
Infodata  written notice  promptly upon the occurrence of or becoming aware of
the  impending  or  threatened  occurrence  of any event  which would cause or
constitute  a breach or would have caused a breach had such event  occurred or
been  known  to  Infodata  prior  to  the  date  hereof,  of  any  of  AMBIA's
representations or warranties contained in this Agreement.

     Section 6.09 INDEMNIFICATION.

          (a)  INDEMNIFICATION  BY  SHAREHOLDERS  AND SPI. Except as set forth
herein,  each of the Shareholders  and SPI,  jointly and severally,  agrees to
indemnify Infodata against, and agrees to hold Infodata harmless from, any and
all Losses  incurred or suffered by Infodata  relating to or arising out of or
in connection with any of the following:

               (i)  any  breach  of  or  any   material   inaccuracy   in  any
     representation or warranty made by AMBIA, SPI or the Shareholders in this
     Agreement or any document  delivered  pursuant to this Agreement,  except
     for Losses arising from breaches of  representations  and warranties made
     under in Sections  4.21(a) and 4.21(b) and the third  sentence of Section
     4.21(c)  hereof and with  respect to any  representations  or  warranties
     regarding  the  "knowledge"  or "best  knowledge" of any Person for which
     such  representations  and  warranties  shall be made  severally  and not
     jointly,  for  which  Losses  each  of the  Shareholders  and  SPI  shall
     individually and severally (and not jointly) indemnify Infodata; or

               (ii)  any   breach  of  or   failure  by  any  or  all  of  the
     Shareholders,  SPI or AMBIA to perform any covenant or obligation of such
     party  set out or  contemplated  in this  Agreement,  after a  reasonable
     opportunity is given to cure such breach as set forth in Section  6.09(g)
     below,  and except for Losses  arising  from  breaches  of or failures to
     perform  covenants or obligations set forth in Sections  6.14hereof,  for
     which  Losses each of the  Shareholders  and SPI shall  individually  and
     severally (and not jointly) indemnify Infodata.

     In  seeking  indemnification  under  this  Section  6.09(a)  against  the
Shareholders  and SPI for Losses,  Infodata shall exercise its remedies solely
with respect to the Escrow Shares deposited into the Escrow Fund under Section
10.01(b) and the Escrow Agreement; PROVIDED that no claims for any such Losses
shall be asserted after the Escrow Period.  Except for willful and intentional
misconduct or fraud,  the remedies set forth in this Section  6.09(a) shall be
the sole and exclusive  remedies of Infodata hereunder against any Shareholder
or SPI, and no Shareholder or SPI shall


                                      25

<PAGE>

have any liability to Infodata under this  Agreement,  except to the extent of
the Escrow Shares deposited under the Escrow Agreement.

          (b)  INDEMNIFICATION BY INFODATA.  Infodata agrees to indemnify each
Shareholder  against,  and agrees to hold each of them harmless  from, any and
all Losses  incurred or  suffered by them  relating to or arising out of or in
connection   with  any  of  the   following;   provided,   however  that  such
indemnification  shall be the sole remedy for the Shareholders for any and all
such Losses and shall be limited to an amount not to exceed the maximum amount
recoverable by Infodata under Section 6.09(a):

               (i)  any  breach  of  or  any   material   inaccuracy   in  any
     representation  or warranty  made by Infodata  in this  Agreement  or any
     document delivered pursuant to this Agreement; or

               (ii) any  breach of or  failure  by  Infodata  to  perform  any
     covenant or obligation set out or contemplated in this Agreement, after a
     reasonable  opportunity  is given to cure  such  breach  as set  forth in
     Section 6.09(g) below.

          (c) CLAIMS.  The provisions of this Section 6.09(c) shall be subject
to Section 6.09(d) below. As soon as is reasonably  practicable after becoming
aware of a claim for  indemnification  under this  Agreement,  the indemnified
person  ("Indemnified  Person") shall promptly give notice to the indemnifying
person  ("Indemnifying  Person") of such claim and the amount the  Indemnified
Person  reasonably  believes it will be entitled to receive hereunder from the
Indemnifying  Person;  provided that the failure of the Indemnified  Person to
promptly  give  notice  shall  not  relieve  the  Indemnifying  Person  of its
obligations  except to the extent (if any) that the Indemnifying  Person shall
have been prejudiced  thereby.  If the Indemnifying  Person does not object in
writing to such  indemnification  claim  within  thirty (30) days of receiving
notice thereof,  the Indemnified  Person shall be entitled to recover,  on the
thirty-fifth  (35th) day after such  notice was given,  from the  Indemnifying
Person the amount of such claim,  and no later  objection by the  Indemnifying
Person shall be permitted;  if the  Indemnifying  Person agrees that it has an
indemnification  obligation  but objects  that it is  obligated  to pay only a
lesser  amount,  the  Indemnified  Person  shall  nevertheless  be entitled to
recover,  on the thirty-fifth (35th) day after such notice was given, from the
Indemnifying  Person the lesser amount,  without  prejudice to the Indemnified
Person's claim for the difference.  In addition to the amounts  recoverable by
the Indemnified Person from the Indemnifying  Person pursuant to the foregoing
provisions,  the Indemnified Person shall also be entitled to recover from the
Indemnifying  Person  interest on such  amounts at the rate of two times Prime
Rate from, and including,  the thirty-fifth (35th) day after such notice of an
indemnification  claim is given to, but not including,  the date such recovery
is actually made by the Indemnified Person.

          (d)  NOTICE  OF  THIRD-PARTY  CLAIMS;  ASSUMPTION  OF  DEFENSE.  The
Indemnified Person shall give notice as promptly as is reasonably  practicable
to the Indemnifying  Person of the assertion of any claim, or the commencement
of any suit, action or proceeding, by any Person not a party hereto in respect
of which indemnity may be sought under this Agreement; provided that the


                                      26

<PAGE>

failure of the  Indemnified  Person to promptly  give notice shall not relieve
the Indemnifying  Person of its obligations except to the extent (if any) that
the Indemnifying Person shall have been prejudiced  thereby.  The Indemnifying
Person may, at its own expense,  (a)  participate in the defense of any claim,
suit,  action or proceeding and (b) upon notice to the Indemnified  Person and
the  Indemnifying  Person's  delivering  to the  Indemnified  Person a written
agreement that the Indemnified Person is entitled to  indemnification  for all
Losses  arising out of such claim,  suit,  action or  proceeding  and that the
Indemnifying  Person shall be liable for the entire amount of any Loss, at any
time during the course of any such claim,  suit, action or proceeding,  assume
the defense thereof;  provided,  however,  that (i) the Indemnifying  Person's
counsel is reasonably  satisfactory  to the Indemnified  Person,  and (ii) the
Indemnifying  Person shall thereafter consult with the Indemnified Person upon
the Indemnified Person's reasonable request for such consultation from time to
time  with  respect  to  such  claim,  suit,  action  or  proceeding.  If  the
Indemnifying  Person assumes such defense,  the Indemnified  Person shall have
the right (but not the duty) to  participate  in the  defense  thereof  and to
employ counsel, at its own expense,  separate from the counsel employed by the
Indemnifying Person. If, however, the Indemnified Person reasonably determines
in its judgment that  representation  by the Indemnifying  Person's counsel of
both the  Indemnifying  Person and the  Indemnified  Person would present such
counsel with a conflict of interest,  then such Indemnified  Person may employ
separate counsel to represent or defend it in any such claim,  action, suit or
proceeding and the Indemnifying Person shall pay the fees and disbursements of
such  separate  counsel.  Whether or not the  Indemnifying  Person  chooses to
defend or prosecute any such claim,  suit,  action or  proceeding,  all of the
parties hereto shall cooperate in the defense or prosecution thereof.

          (e) SETTLEMENT OR COMPROMISE.  Any settlement or compromise  made or
caused to be made by the Indemnified Person or the Indemnifying Person, as the
case may be, of any claim,  suit,  action or proceeding  shall also be binding
upon the Indemnifying Person or the Indemnified Person, as the case may be, in
the same manner as if a final  judgment or decree had been  entered by a court
of competent  jurisdiction  in the amount of such  settlement  or  compromise;
provided, however, that no obligation, restriction, injunction, agreement with
the effect of an  injunction,  or Loss  shall be  imposed  on the  Indemnified
Person as a result of such settlement  without its prior written consent.  The
Indemnified  Person  will give the  Indemnifying  Person at least  thirty (30)
days' notice of any proposed  settlement  or  compromise  of any claim,  suit,
action or  proceeding  it is  defending,  during  which time the  Indemnifying
Person may reject such proposed settlement or compromise;  provided,  however,
that from and after such rejection, the Indemnifying Person shall be obligated
to assume the defense of and full and complete  liability  and  responsibility
for  such  claim,  suit,  action  or  proceeding  and any and  all  Losses  in
connection  therewith in excess of the amount of unindemnifiable  Losses which
the  Indemnified  Person  would have been  obligated to pay under the proposed
settlement or compromise.

          (f)  FAILURE OF  INDEMNIFYING  PERSON TO ACT.  In the event that the
Indemnifying  Person does not elect to assume the defense of any claim,  suit,
action or proceeding,  then any failure of the Indemnified Person to defend or
to participate in the defense of any such claim, suit, action or proceeding or
to cause the same to be done, shall not relieve the Indemnifying Person of its
obligations hereunder.


                                      27

<PAGE>

          (g) CURE FOR BREACHES OF  COVENANTS.  In the event any party to this
Agreement  breaches any of its covenants or obligations  made hereunder (other
than covenants and obligations made under Section 6.01 or 6.09 hereof),  he/it
shall be given  ten (10) days  within  which to cure  such  breach,  following
receipt by the breaching party of written notice from the non-breaching  party
of the existence and the extent of each such breach.  The parties  acknowledge
and agree that the  foregoing  cure  period is  reasonable  in relation to the
covenants and obligations they have undertaken pursuant to this Agreement.

          (h) The  provisions  of this Section 6.09 are intended to be for the
benefit of, and shall be enforceable  by, each  Indemnified  Person and his or
its heirs and representatives.

     Section  6.10  CERTAIN  BENEFITS.  (a) Each of Infodata  and  Acquisition
acknowledges  that  consummation  of the  transactions  contemplated  by  this
Agreement  will  constitute  a change in control of AMBIA (to the extent  such
concept is applicable) for the purposes of all agreements,  contracts,  plans,
programs,  policies or  arrangements  of AMBIA.  From and after the  Effective
Time, Infodata and its subsidiaries (including the Surviving Corporation) will
honor  in  accordance  with  their  terms  all  employee   benefit  plans  and
employment,  severance  and  consulting  agreements  described in EXHIBIT 6.10
attached hereto between AMBIA and any officer,  director, or employee of AMBIA
in effect prior to the Effective Time; PROVIDED,  HOWEVER, that nothing herein
shall  preclude any changes  effected on a  prospective  basis to any employee
benefit plan.

          (b) Infodata agrees that it will cause the Surviving  Corporation to
provide  compensation,  employee  benefit  plans and other  employee  benefits
currently  provided by AMBIA to its employees  employed as of the date of this
Agreement  and as of the  Effective  Time which  will,  in the  aggregate,  be
consistent  with and no less  favorable  than the  compensation  and  benefits
provided by Infodata and its other subsidiaries to their employees.

     Section 6.11 AMBIA STOCK  PLANS,  ETC. (a) At the  Effective  Time,  each
outstanding  option ("AMBIA Stock Option") to purchase  shares of AMBIA common
stock,  no par value per share,  under the AMBIA Equity  Incentive Plan or any
other plan or agreement,  whether vested or unvested,  shall be converted into
an option ("Replacement  Option") to acquire, on the same terms and conditions
as were  applicable  under such AMBIA  Stock  Option,  4/45 shares of Infodata
Common Stock, at an exercise price of $1.69 per share with the same expiration
date as such AMBIA Stock Option. Each Replacement Option shall be treated as a
non-qualified  stock  option  under  the Code and,  if  possible,  as  granted
pursuant to the terms and  conditions of the 1995 Infodata  Stock Option Plan,
as amended, and the AMBIA Stock Option agreement entered into by AMBIA and the
participant in the AMBIA Equity Incentive Plan.

          (b) As soon as practicable after the Effective Time,  Infodata shall
deliver to each holder of AMBIA Stock Options  described in Section 6.11(a) an
agreement substantially in the form attached hereto as EXHIBIT 6.11(b) setting
forth such holder's rights and obligations under


                                      28

<PAGE>

and with respect to the  Replacement  Option.  Infodata  shall comply with the
terms of any such agreement.

          (c) Infodata  shall take all corporate  action  necessary to reserve
for  issuance  a  sufficient  number of shares of  Infodata  Common  Stock for
delivery pursuant to the terms set forth in this Section 6.11, and such shares
shall be registered on a Form S-8 no later than forty-five (45) days after the
Effective  Date, to permit the legal issuance and exercise of the  Replacement
Options, and unrestricted resale in the U.S. markets of the shares issued upon
exercise of such Options.

     Section  6.12   REGISTRATION  OF  INFODATA   SHARES.   Infodata  and  the
Shareholders shall enter into a registration rights agreement substantially in
the  form  attached   hereto  as  EXHIBIT  6.12  (the   "Registration   Rights
Agreement"), pursuant to which the Shareholders will receive certain rights to
register their Infodata Shares in accordance with the terms of such agreement.

     Section  6.13  EXPENSES.  Whether or not the Merger is  consummated,  all
costs  and  expenses  incurred  in  connection  with  this  Agreement  and the
transactions  contemplated  hereby shall be paid by the party  incurring  such
costs and expenses; PROVIDED, HOWEVER, that the Shareholders shall bear all of
the costs and expenses of counsel to the  Shareholders and AMBIA in connection
with  the   preparation,   negotiation   and  performance  of  this  Agreement
(including,  without limitation, the letter of intent dated May 1, 1997), and,
if the Merger is consummated in accordance with this Agreement, Infodata shall
bear  all of the  costs  and  expenses  of the  accounting  firm of  AMBIA  in
connection with the audit of AMBIA's Financial  Statements and the preparation
of the Interim Financial  Statements.  Notwithstanding  anything herein to the
contrary,  AMBIA  shall be  responsible  for its  payroll  and other costs and
expenses of operations through the Effective Date.

     Section 6.14 NONCOMPETITION.  Each of the Shareholders and SPI agree that
the following  provisions of this Section are  intimately  linked to the other
transactions  contemplated  by this  Agreement,  and each  Shareholder and SPI
acknowledge  that Infodata  would not enter into this  Agreement  without each
Shareholder and SPI agreeing to be bound by the following  provisions from the
date hereof until the Ending Date (as hereinafter defined):

          (a)  Except  as  expressly  approved  (which  approval  shall not be
unreasonably  withheld) by Infodata,  each Shareholder and SPI (for so long as
SPI remains  controlled  by the  Shareholders)  agrees that from and after the
date of this Agreement  until the second  anniversary  of the Effective  Date,
that he or it shall not directly or indirectly:

               (i) except in connection with any duties as a director, officer
     or employee of AMBIA or  Infodata,  divert or attempt to divert any party
     who is or was an existing or prospective client,  customer or supplier of
     AMBIA and/or  Infodata  from engaging in business with AMBIA or Infodata,
     or provide any services or products to or engage in any business  that is
     competitive with Infodata's or AMBIA's Business;


                                      29

<PAGE>

               (ii)  during the  one-year  period  immediately  following  the
     Effective  Date,  solicit  for  employment  or  encourage  to leave their
     employment, in each case, either as an employee, agent or representative,
     any person who was during the two-year period prior to such  solicitation
     or encouragement or is an officer,  employee,  agent or representative of
     AMBIA or Infodata;

               (iii) disturb, or attempt to disturb, any business relationship
     between any third party and AMBIA or Infodata; or

               (iv) make any statement to any third party, including the press
     or  media,  which  is  false  or  defamatory  regarding  either  AMBIA or
     Infodata.

          (b) In the event of actual breach of the provisions of this Section,
Infodata, in addition to any other remedies available to it for such breach or
threatened  breach,  including  the recovery of damages,  shall be entitled to
seek  an  injunction  restraining  any or  all  of  Shareholders  or  SPI,  as
appropriate, from such conduct.

          (c) If at any time any of the  provisions  of this Section  shall be
determined  to be  invalid  or  unenforceable  by  reason  of  being  vague or
unreasonable as to duration,  area, scope of activity or otherwise,  then this
Section shall be considered  divisible (with the other provisions to remain in
full force and  effect)  and the  invalid or  unenforceable  provisions  shall
become and be deemed to be  immediately  amended  to  include  only such time,
area, scope of activity and other  restrictions,  as shall be determined to be
reasonable and enforceable by the court or other body having jurisdiction over
the matter, and each Shareholder and SPI expressly agrees that this Agreement,
as  so  amended,  shall  be  valid  and  binding  as  though  any  invalid  or
unenforceable provision had not been included herein.

          (d) The  provisions of this Section shall be in addition to, and not
in  limitation  of,  any other  provisions  contained  in any other  agreement
restricting competition by any or all of the Shareholders or SPI.

          (e) The Shareholders and SPI shall not, directly or indirectly,  (i)
disclose,  or (ii) use for their own benefit,  or for the benefit of any other
Person (other than, in the case of (a) below, AMBIA or an Affiliate of AMBIA),
(a) any secret or  confidential  information,  lists of clients,  customers or
suppliers, information relating to any clients, customers or suppliers, or any
other  data of or  pertaining  to AMBIA or to any  Affiliate  of AMBIA,  their
respective  businesses or financial affairs, or their products which are not a
matter  of  public  knowledge  or (b) any  Infodata  Confidential  Information
(collectively,  the "Confidential Information").  Each Shareholder agrees that
upon termination of any such Shareholder's  employment or consulting agreement
with  Infodata for any reason and upon the request of Infodata on or after the
Closing Date,  he will  immediately  deliver to Infodata all original  papers,
books, manuals, lists,  correspondence and documents containing or relating to
the Confidential  Information,  together with all copies thereof,  except that
each  Shareholder  may keep copies of such  materials as shall be necessary to
permit such Shareholder to prepare his tax returns or to comply with any other
legal requirements. Each of the


                                      30

<PAGE>

parties agrees that, from the date of this Agreement until the Effective Date,
it will not,  directly or  indirectly,  (i) disclose,  or (ii) use for its own
benefit,  or for the  benefit of any other  Person any secret or  confidential
information, lists of clients, customers or suppliers, information relating to
any clients, customers or suppliers, or any other data of or pertaining to any
of the  other  parties  or  their  Affiliates,  their  respective  businesses,
financial  affairs,  or their  services or products  which are not a matter of
public knowledge and which were obtained in connection with work performed for
or related to AMBIA and/or Infodata.

     Section 6.15 APPOINTMENT OF FISHER AS INFODATA  DIRECTOR.  Promptly after
the  Effective  Date,  Infodata  shall  appoint  Alan  Fisher  to its Board of
Directors. Mr. Fisher shall remain on Infodata's Board of Directors as long as
(i) the Shareholders  collectively hold (and/or control the voting rights with
respect  to) a total of at least  five  percent  (5%)  and Alan  Fisher  holds
(and/or  controls the voting rights with respect to) at least two and one-half
percent (2.5%) of the issued and  outstanding  shares of Infodata Common Stock
and  (ii)  Mr.  Fisher  is  elected  at  the  annual   meeting  of  Infodata's
shareholders. Infodata (through its Nominating Committee) shall recommend Alan
Fisher as a  nominee  to its Board of  Directors,  and its Board of  Directors
shall select Mr. Fisher as a nominee for election to the Board,  provided that
the  requirements  in  subparagraph  (i) above are met on the date of any such
Nominating  Committee and Board action. Mr. Fisher shall be entitled to all of
the rights and benefits  generally  available to other  members of  Infodata's
Board of Directors, including, without limitation, the right to receive grants
of stock  options  to  purchase  Infodata  Common  Stock on the same terms and
conditions as may be granted from time-to-time to other Infodata Directors.

     Section 6.16 EMPLOYMENT AGREEMENT FOR MOHIUDDIN. Infodata agrees to enter
into an Employment  Agreement with Razi Mohiuddin,  substantially  in the form
attached  hereto  as  EXHIBIT  6.16,  which  agreement  will  provide  for the
employment by Infodata of Mohiuddin as a Vice President of Infodata, at a base
annual  salary rate of $110,000 for a period of  twenty-four  (24) months from
the  Effective   Date.  The  Employment   Agreement  also  shall  provide  for
Mohiuddin's  participation in Infodata's  incentive  compensation  program and
Infodata's 1995 Stock Option Plan. The Employment Agreement shall be renewable
separately  by the mutual  agreement  of  Infodata  and  Mohiuddin,  and shall
contain a  noncompetition  provision on the terms and  conditions set forth in
Section 6.14 hereof.

     Section  6.17  CONSISTENT  TAX  TREATMENT.  Infodata  and  the  Surviving
Corporation  agree  that they  shall not take any  position  on any Tax Return
inconsistent  with  that of  AMBIA,  SPI and the  Shareholders  regarding  the
tax-free  nature of the  Spin-Off  of AMBIA from SPI under  Section 355 of the
Code.  All of the parties  agree not to take any action that would prevent the
Merger  from  constituting  a  tax-free  reorganization  qualifying  under the
provisions of Sections 368(a) and (b) of the Code.

     Section  6.18  NEGATIVE  COVENANTS  OF  INFODATA.   Except  as  expressly
contemplated  by this  Agreement or  otherwise  consented to in writing by the
Shareholders  (such consent not to be  unreasonably  withheld),  from June 30,
1997 until the Effective Date,  Infodata shall not: (i) amend any of the terms
or provisions of the Infodata Common Stock which amendment would have an


                                      31

<PAGE>

adverse effect on the Stockholders,  including,  without limitation, any stock
splits or  issuances  of capital  stock with  respect to the  Infodata  Common
Stock;  (ii)  knowingly  take any action  which  would  result in a failure to
maintain the quotation of the Infodata  Common Stock on NASDAQ;  (iii) declare
or pay any dividends or other  distribution  (whether in cash,  stock or other
property) on outstanding  shares of capital stock;  (iv) take or agree to take
any  action  that  would  or  is  likely  to  result  in  any  of   Infodata's
representations  and warranties set forth in this Agreement being untrue or in
any of the  conditions  to the  Merger  not being  satisfied;  or (v) agree in
writing or otherwise to do any of the foregoing.


                                  ARTICLE VII

                                  CONDITIONS

     Section 7.01 CONDITIONS TO EACH PARTY'S  OBLIGATION TO EFFECT THE MERGER.
The respective  obligation of each party to effect the Merger shall be subject
to the  satisfaction  at or  prior  to the  Effective  Date  of the  following
conditions:

          (a) This  Agreement  shall  have been  approved  and  adopted by the
affirmative vote of both of the Shareholders.

          (b)  Other  than  the  filing  provided  for by  Section  2.01,  all
authorizations,  consents,  orders or approvals of, or declarations or filings
with, any Governmental  Authority,  and all required third party consents, the
failure to obtain which would result in an Infodata  Material  Adverse Effect,
shall have been filed, occurred or been obtained.

          (c)  No  statute,  rule,  regulation,  executive  order,  decree  or
injunction  shall have been enacted,  entered,  promulgated or enforced by any
Governmental  Authority  which  prohibits the  consummation  of the Merger and
shall be in effect.

          (d) The  Escrow  Agreement  shall  have  been duly  executed  by the
Shareholders,  SPI,  Infodata and the Escrow Agent,  which  agreement shall be
effective as of the Effective Date.

          (e) The Employment  Agreement  shall have been duly executed by Razi
Mohiuddin,  the Surviving  Corporation  and Infodata,  and shall be binding on
such parties and effective as of the Effective Date.

          (f) The Registration  Rights Agreement shall have been duly executed
by the  Shareholders,  the  Surviving  Corporation  and  Infodata and shall be
binding on such parties and effective as of the Effective Date.

     Section 7.02  CONDITIONS OF  OBLIGATIONS  OF INFODATA AND  ACQUISITION TO
EFFECT THE MERGER.  The  obligations of Infodata and Acquisition to effect the
Merger are further subject to the


                                      32

<PAGE>

satisfaction  at or prior to the Effective  Date of the following  conditions,
unless waived by Infodata and Acquisition:

          (a) The  representations  and  warranties of AMBIA set forth in this
Agreement  shall be true and  correct  as of the date of this  Agreement,  and
shall also be true in all material  respects on and as of the  Effective  Date
with the same force and effect as though made on and as of the Effective Date,
except if and to the extent any failures to be true and correct  would not, in
the aggregate, result in an AMBIA Material Adverse Effect.

          (b)  From the  date of this  Agreement  through  and  including  the
Effective  Date,  except as set forth in EXHIBIT  4.06,  AMBIA  shall not have
suffered any AMBIA Material Adverse Changes.

          (c) AMBIA  shall  have  performed  all  obligations  required  to be
performed by it under this  Agreement at or prior to the Effective  Date,  and
all  representations  and  warranties  shall  be true  and  correct  as of the
Effective  Date,  except  where any  failures  to perform or  breaches of such
representations or warranties would not, in the aggregate,  result in an AMBIA
Material  Adverse Effect,  and shall provide a certificate of the President of
AMBIA to that effect.

          (d) AMBIA shall furnish Infodata with copies of (i) resolutions duly
adopted  by the  Board of  Directors  of AMBIA  approving  the  execution  and
delivery of this Agreement and all other necessary or proper  corporate action
to  enable  AMBIA  to  comply  with  the  terms  of this  Agreement,  (ii) the
resolution duly adopted by the holders of AMBIA Shares  approving and adopting
this  Agreement  and the  Merger,  such  resolutions  to be  certified  by the
Secretary or Assistant Secretary of AMBIA.

          (e) Opinions of AMBIA's  Counsel.  AMBIA shall furnish Infodata with
an opinion,  dated as of the  Effective  Date,  of Fenwick & West,  counsel to
AMBIA, in form and substance  satisfactory to Infodata and its counsel, in the
form attached hereto as EXHIBIT 7.02(e), to the effect that:

               (i) AMBIA is a corporation duly incorporated,  validly existing
     and in good standing under the laws of the State of California;

               (ii) AMBIA has the corporate  power to carry on its business as
     it is being conducted on the Closing Date;

               (iii)  the  authorized  capital  stock  of  AMBIA  consists  of
     5,000,000  AMBIA Shares,  and the AMBIA Shares issued and  outstanding on
     the date  hereof  are  validly  issued  and  outstanding,  fully paid and
     nonassessable  and that between the date hereof and the Effective Date no
     additional  shares of capital stock of AMBIA have been issued and none of
     such issued and outstanding  AMBIA Shares were issued in violation of any
     preemptive rights of shareholders of AMBIA;


                                      33

<PAGE>

               (iv) AMBIA has taken all required  corporate  action to approve
     and  adopt  this  Agreement  and the  related  agreements  and  contracts
     contemplated  hereby and this Agreement is a valid and binding obligation
     of AMBIA enforceable against AMBIA in accordance with its terms,  subject
     as to enforcement to bankruptcy,  reorganization,  moratorium, insolvency
     and  other  laws  of  general  applicability  relating  to  or  affecting
     creditors' rights and to general equity principles;

               (v) the execution and delivery of this  Agreement by AMBIA does
     not,  and  the  consummation  of the  transactions  contemplated  by this
     Agreement by AMBIA will not,  constitute (i) a breach or violation of, or
     a default under,  the Articles of  Incorporation  or Bylaws of AMBIA,  or
     (ii) a breach,  violation  or  impairment  of, or a  default  under,  any
     judgment,  decree, order, statute, law, ordinance, rule or regulation now
     in effect applicable to AMBIA or its respective  properties known to such
     counsel, or any agreement, indenture, mortgage, lease or other instrument
     of AMBIA or to which  AMBIA is  subject  and in each  case  known to such
     counsel; and

               (vi) All  filings  required  to be made by  AMBIA  prior to the
     Effective   Time  with,   and  all   consents,   approvals,   permits  or
     authorizations  required to be  obtained by AMBIA prior to the  Effective
     Date from, Governmental  Authorities in connection with the execution and
     delivery  of  this  Agreement  by  AMBIA  and  the  consummation  of  the
     transactions  contemplated by this Agreement by AMBIA,  have been so made
     or obtained, as the case may be.

          In rendering the foregoing  opinion (the  "Primary  Opinion"),  such
counsel may rely on  certificates  of officers  and other  agents of AMBIA and
public  officials as to matters of fact and, as to matters relating to the law
of jurisdictions other than California, upon opinions of counsel of such other
jurisdictions reasonably satisfactory to Parent and its counsel, provided such
reliance is  expressly  noted in the Primary  Opinion and the opinions of such
other  counsel  and the  certificates  of such  officers,  agents  and  public
officials relied on are attached to the Primary Opinion.

          (f) All actions, proceedings,  instruments and documents required to
carry out this Agreement,  or incidental  hereto,  and all other legal matters
shall have been  approved  by  Freedman,  Levy,  Kroll &  Simonds,  counsel to
Infodata, and such counsel shall have received all documents, certificates and
other papers reasonably requested by it in connection therewith.

     Section 7.03 CONDITIONS OF OBLIGATION OF AMBIA TO EFFECT THE MERGER.  The
obligation  of  AMBIA  to  effect  the  Merger  is  further   subject  to  the
satisfaction  at or prior to the Effective  Date of the following  conditions,
unless waived by AMBIA:


                                      34

<PAGE>

          (a) The representations and warranties of Infodata set forth in this
Agreement  shall be true and  correct  as of the date of this  Agreement,  and
shall also be true in all material  respects on and as of the  Effective  Date
with the same force and effect as though made on and as of the Effective Date,
except if and to the extent any failures to be true and correct  would not, in
the aggregate, result in an Infodata Material Adverse Effect.

          (b)  From the  date of this  Agreement  through  and  including  the
Effective Date,  except as set forth in EXHIBIT 5.06,  Infodata shall not have
suffered any Infodata  Material Adverse Changes (other than changes  generally
affecting the industries in which Infodata operates,  including changes due to
actual or proposed changes in law or regulation).

          (c) Infodata  shall have  performed all  obligations  required to be
performed by it under this  Agreement at or prior to the Effective  Date,  and
all  representations  and  warranties  shall  be true  and  correct  as of the
Effective  Date,  except  where any  failures  to perform or  breaches of such
representations  or warranties  would not, in the  aggregate,  have a material
adverse effect on Infodata and its  subsidiaries  taken as a whole,  and shall
provide a certificate of the President of Infodata to that effect.

          (d) Infodata and Acquisition  shall furnish AMBIA with copies of (i)
resolutions duly adopted by their respective Boards of Directors approving the
execution  and delivery of this  Agreement  and all other  necessary or proper
corporate  action to enable them to comply  with the terms of this  Agreement,
(ii) the  resolutions  duly  adopted by  Infodata as the sole  shareholder  of
Acquisition approving of the Merger and the transactions  contemplated in this
Agreement,  such  resolutions to be certified by the  President,  Secretary or
Assistant Secretary of Infodata.

          (e) Infodata  shall furnish  AMBIA with an opinion,  dated as of the
Effective Date, of Freedman,  Levy,  Kroll & Simonds,  counsel to Infodata and
Acquisition,  in form and substance  satisfactory to AMBIA and its counsel, in
the form attached hereto as EXHIBIT 7.03(e), to the effect that:

               (i) Each of Infodata  and  Acquisition  is a  corporation  duly
     incorporated, validly existing and in good standing under the laws of the
     state in which such corporations were incorporated;

               (ii) each has the corporate power to carry on its businesses as
     they are being conducted on the Effective Date;

               (iii) the  authorized  capital  stock of  Infodata  consists of
     6,666,666 shares of Infodata Common Stock and 500,000 shares of preferred
     stock,  and the Infodata  Shares and the shares of Infodata  Common Stock
     issued  and  outstanding  on the  date  hereof  are  validly  issued  and
     outstanding, fully paid and nonassessable and that between June 30, 1997,
     and the Effective Date no additional shares of Infodata Common Stock have
     been issued  (other than shares issued upon the exercise of stock options
     or warrants


                                      35

<PAGE>

     granted under  Infodata's  stock option and warrant plans  referred to in
     Section 5.02) and none of such issued and outstanding  Shares were issued
     in violation of any preemptive rights of shareholders of Infodata;

               (iv)  Infodata  and  Acquisition  has each  taken all  required
     corporate  action to approve  and adopt this  Agreement  and the  related
     agreements  and  contracts   contemplated   hereby  (including,   without
     limitation,  the Registration  Rights  Agreement) and this Agreement is a
     valid and binding obligation of the each,  enforceable in accordance with
     its  terms,  subject as to  enforcement  to  bankruptcy,  reorganization,
     moratorium,  insolvency and other laws of general applicability  relating
     to or affecting creditors' rights and to general equity principles;

               (v) the execution and delivery of this Agreement by each of the
     Infodata and Acquisition do not, and the consummation of the transactions
     contemplated by this Agreement by each will not,  constitute (i) a breach
     or violation of, or a default  under,  the articles of  incorporation  or
     bylaws of either,  or (ii) a breach,  violation  or  impairment  of, or a
     default under, any judgment, decree, order, statute, law, ordinance, rule
     or  regulation  now in effect  applicable  to either or their  respective
     properties known to such counsel, or any agreement,  indenture, mortgage,
     lease or other  instrument of either or to which either is subject and in
     each case known to such counsel and

               (vi)  all  filings  required  to be made by each  prior  to the
     Effective   Date  with,   and  all   consents,   approvals,   permits  or
     authorizations  required to be  obtained  by each prior to the  Effective
     Date from, Governmental  Authorities in connection with the execution and
     delivery  of  this  Agreement  by  AMBIA  and  the  consummation  of  the
     transactions contemplated by this Agreement by each, have been so made or
     obtained, as the case may be.

          In rendering the foregoing  opinion (the  "Primary  Opinion"),  such
counsel may rely on  certificates  of officers and other agents of Infodata or
Acquisition  and public  officials  as to  matters of fact and,  as to matters
relating to the law of  jurisdictions  other than Delaware and Virginia,  upon
opinions of counsel of such other  jurisdictions  reasonably  satisfactory  to
AMBIA and its  counsel,  provided  such  reliance  is  expressly  noted in the
Primary Opinion and the opinions of such other counsel and the certificates of
such  officers,  agents and public  officials  relied on are  attached  to the
Primary Opinion.

          (f) Infodata  shall furnish  AMBIA with an opinion,  dated as of the
Effective Date, of Freedman,  Levy,  Kroll & Simonds,  counsel to Infodata and
Acquisition,  in form and substance  satisfactory to AMBIA and its counsel, in
the form attached hereto as EXHIBIT 7.03(f) (THE "TAX OPINION"), to the effect
that  the  Merger  will be  treated  for  federal  income  tax  purposes  as a
reorganization within the meaning of Section 368(a) of the Code, and Infodata,
AMBIA, and Acquisition will each be a party to the  reorganization  within the
meaning of Section  368(b) of the Code.  In rendering  the Tax  Opinion,  such
counsel may rely on certificates of officers and other


                                      36

<PAGE>

agents of Infodata,  AMBIA and SPI and/or upon  representation  letters of the
Shareholders,  SPI,  AMBIA and  Infodata in forms  attached  hereto as EXHIBIT
7.03(f)-1.

          (g) All actions, proceedings,  instruments and documents required to
carry out this Agreement,  or incidental  hereto,  and all other legal matters
shall have been approved by Fenwick & West,  LLP,  counsel to AMBIA,  and such
counsel  shall have  received  all  documents,  certificates  and other papers
reasonably requested by it in connection therewith.


                                 ARTICLE VIII

                           TERMINATION AND AMENDMENT

     Section 8.01  TERMINATION.  This  Agreement may be terminated at any time
prior to the Effective  Time,  whether before or after approval of the matters
presented  in  connection  with the  Merger  by the  stockholders  of AMBIA or
Infodata:

          (a) by mutual consent of Infodata and AMBIA;

          (b) by either  Infodata  or AMBIA if the Merger  shall not have been
consummated  before  September 30, 1997 (unless the failure to consummate  the
Merger by such date  shall be due to the action or failure to act of the party
seeking to terminate this Agreement); or

          (c) by  either  Infodata  or  AMBIA  if (i) the  conditions  to such
party's  obligations  shall  have  become  impossible  to  satisfy or (ii) any
permanent  injunction or other order of a court or other  competent  authority
preventing  the  consummation  of the  Merger  shall  have  become  final  and
non-appealable  (unless  either (i) or (ii)  above  shall be the result of any
improper  action or inaction on the part of either  Infodata or AMBIA,  as the
case may be).

     Section 8.02 EFFECT OF  TERMINATION.  In the event of the termination and
abandonment of this Agreement pursuant to Section 8.01 hereof,  this Agreement
shall forthwith  become void and have no effect,  without any liability on the
part  of  any  party  hereto  or  its  Affiliates,   directors,   officers  or
stockholders,  other than the provisions of Sections 6.04,  6.15(a),  6.15(e),
and 10.08. Nothing contained in this Section 8.02 shall relieve any party from
liability for any breach of this Agreement.

     Section  8.03  AMENDMENT.  This  Agreement  may be amended by the parties
hereto, by action taken or authorized by their respective Boards of Directors,
at any time before or after  approval of the matters  presented in  connection
with  the  Merger  by the  Shareholders,  but,  after  any such  approval,  no
amendment  shall  be  made  which  by law  requires  further  approval  by the
Shareholders without such further approval.  This Agreement may not be amended
except by an  instrument  in writing  signed on behalf of each of the  parties
hereto.


                                      37

<PAGE>

     Section 8.04 EXTENSION;  WAIVER. At any time prior to the Effective Date,
the parties hereto may, to the extent legally allowed, (i) extend the time for
the  performance of any of the  obligations or other acts of the other parties
hereto,  (ii) waive any  inaccuracies  in the  representations  and warranties
contained herein or in any document  delivered pursuant hereto and (iii) waive
compliance  with any of the  agreements or conditions  contained  herein.  Any
agreement on the part of a party hereto to any such  extension or waiver shall
be valid  only if set forth in a written  instrument  signed on behalf of such
party.


                                  ARTICLE IX

                         POST-EFFECTIVE DATE COVENANTS

     Section 9.01 TAX RETURNS. In filing federal tax returns at any time, each
of the  Shareholders,  Infodata,  AMBIA and Acquisition  shall take consistent
filing  positions  to the effect that for federal  income tax purposes (i) the
Merger  qualifies  as  a  "reorganization"   within  the  meaning  of  Section
368(a)(1)(A)  of the Code, and no Shareholder is required to recognize  income
gain or loss with  respect  thereto;  (ii) a  Shareholder  is not  required to
recognize  any income or gain with  respect to his right,  if any,  to receive
payments  under  such  Shareholder's   employment  agreement;  and  (iii)  the
recipients of Replacement  Options to purchase  Infodata Common Stock will not
recognize income or gain on the receipt of such options.

     Section 9.02 ADJUSTMENT. Any adjustment referred to in Section 3.02 shall
be made in accordance with that Section.

     Section 9.03 FURTHER INSTRUMENTS AND ACTIONS. From time to time after the
Effective Date,  AMBIA, SPI and the Shareholders  shall execute and deliver to
Infodata  such  further  instruments  of sale and  assignment  as Infodata may
reasonably  request and AMBIA, SPI and the  Shareholders  shall take all other
actions,  as  required  by  Infodata,  in order to fully  vest and  confirm in
Infodata all right,  title and  interest of the AMBIA Shares and  otherwise to
carry out the purposes of this Agreement.


                                   ARTICLE X

                                 MISCELLANEOUS

     Section 10.01  SURVIVAL OF  REPRESENTATIONS,  WARRANTIES  AND  COVENANTS;
ESCROW.

          (a) SURVIVAL.  All of the representations,  warranties and covenants
made herein shall survive the Effective Date, for a period of two (2) years.


                                      38

<PAGE>

          (b) ESCROW ARRANGEMENTS.

               (i) At the Closing, 60,000 Infodata Shares (plus any additional
     New Shares (as defined  below) as may be issued in respect  thereof after
     the Closing)(collectively,  the "Escrow Shares") will be delivered to and
     deposited with  SETTLEMENTCORP of Washington,  D.C. (the "Escrow Agent"),
     which deposit shall  constitute a fund (the "Escrow Fund") to be governed
     by the terms of the  agreement  dated as of the  Effective  Date attached
     hereto as EXHIBIT  10.01(b) and at Infodata's sole cost and expense.  The
     portion  of  the  Escrow  Shares  deposited  on  behalf  of  each  of the
     Shareholders is listed opposite such  Shareholder's  name on the attached
     EXHIBIT  10.01(b)(i).  The Escrow Fund shall be available  to  compensate
     Infodata and its  Affiliates  for any Losses  incurred as a result of any
     breach by AMBIA, SPI or the Shareholders of any representation, warranty,
     covenant or agreement  contained  herein.  Nothing herein shall limit the
     liability of AMBIA,  SPI or the  Shareholders  for any breach of any such
     representation,  warranty,  covenant or  agreement if the Merger does not
     close.  Resort to the  Escrow  Fund  shall be the  exclusive  contractual
     remedy  of  Infodata  and  its  Affiliates  for  any  such  breaches  and
     misrepresentations  if the Merger does  close;  PROVIDED,  HOWEVER,  that
     nothing  herein  shall  limit any  noncontractual  remedy for  willful or
     intentional misconduct or for gross misrepresentations.

               (ii)  Subject  to the  requirements  set  forth  in the  Escrow
     Agreement,  the Escrow Fund shall  remain in  existence  until the second
     anniversary date of the Effective Date (the "Escrow  Period").  Following
     the first  anniversary date of the Effective Date, the Escrow Agent shall
     release from the Escrow Fund and  distribute to the  Shareholders  Twenty
     Thousand  (20,000)  of the Escrow  Shares;  PROVIDED,  HOWEVER,  that the
     number of Escrow Shares,  which, in the manner and on the terms set forth
     in the Escrow Agreement, are necessary to satisfy any unsatisfied pending
     claims existing as of the first  anniversary  date of the Effective Date,
     shall  remain in the Escrow Fund until such  claims  have been  resolved.
     Upon  expiration of the Escrow  Period,  the Escrow Fund shall  terminate
     with respect to the Escrow Shares remaining in the Escrow Fund; PROVIDED,
     HOWEVER,  that the number of Escrow Shares,  which,  in the manner and on
     the terms set forth in the Escrow Agreement, are necessary to satisfy any
     unsatisfied  pending  claims  existing  as of the last date of the Escrow
     Period,  shall  remain in the Escrow  Fund until  such  claims  have been
     resolved. As soon as all such claims have been resolved, the Escrow Agent
     shall deliver to the  Shareholders  all Escrow Shares and other  property
     remaining in the Escrow Fund not required to satisfy such claims.

               (iii)  Any  shares of  Infodata  Common  Stock or other  equity
     securities  issued or  distributed by Infodata  (including  shares issued
     upon a stock split) in respect of Escrow Shares ("New Shares")  remaining
     in the Escrow Fund shall be added to the Escrow  Fund and shall  become a
     part thereof.

               (iv) Any Escrow  Shares that are retained in the Escrow Fund to
     satisfy  claims  arising   hereunder   shall  not  be  delivered  to  the
     Shareholders,  but shall be  delivered to Infodata as soon as such claims
     have been resolved, in accordance with the terms of the Escrow Agreement.


                                      39

<PAGE>

     Section 10.02  NOTICES.  All notices and other  communications  hereunder
shall be in writing  (and shall be deemed  given upon  receipt)  if  delivered
personally,  telecopied  (which  is  confirmed)  or mailed  by  registered  or
certified  mail (return  receipt  requested)  to the parties at the  following
addresses  (or at such other address for a party as shall be specified by like
notice):

          (a) if to Infodata or Acquisition, to

              Infodata Systems Inc.
              12150 Monument Drive, Suite 400
              Fairfax, Virginia  22033
              Attention: Chris Dettmar, Chief Financial Officer
              Facsimile No.: (703) 934-7154

              with a copy to

              Walter Freedman, Esq.
              Freedman, Levy, Kroll & Simonds
              1050 Connecticut Avenue, N.W., Suite 825
              Washington, D.C.  20036-5366
              Facsimile No.: (202) 457-5151

              and

          (b) if to AMBIA, to

              Alan S. Fisher
              8 Deer Oaks Drive
              Pleasanton, CA  94588
              Facsimile No.: 510-846-6853

              with a copy to:

              Razi Mohiuddin
              19805 Oakhaven Drive
              Saratoga, CA  95070
              Facsimile No.: 408-446-2198

              and a copy to


                                      40

<PAGE>

              Mark C. Stevens, Esq.
              Fenwick & West, LLP
              Two Palo Alto Square
              Palo Alto, California  94306
              Facsimile No.:  415-857-0361

     Section 10.03 DESCRIPTIVE  HEADINGS.  The descriptive headings herein are
inserted for convenience  only and are not intended to be part of or to affect
the meaning or interpretation of this Agreement.

     Section 10.04 COUNTERPARTS. This Agreement may be executed in two or more
counterparts,  all of which shall be considered one and the same agreement and
shall become effective when two or more  counterparts have been signed by each
of the parties and delivered to the other parties,  it being  understood  that
all parties need not sign the same counterpart.

     Section  10.05  ENTIRE   AGREEMENT;   ASSIGNMENT.   This   Agreement  (a)
constitutes  the entire  agreement and  supersedes  all prior  agreements  and
understandings,  both written and oral,  among the parties with respect to the
subject matter hereof (other than any  confidentiality  agreement  between the
parties;  any provisions of such agreements  which are  inconsistent  with the
transactions contemplated by this Agreement being waived hereby) and (b) shall
not be assigned by operation of law or  otherwise,  provided that Infodata may
cause  Acquisition  to assign its rights and  obligations  to  Infodata or any
other  wholly  owned  subsidiary  of Infodata,  but no such  assignment  shall
relieve  Acquisition  of its  obligations  hereunder if such assignee does not
perform such obligations.

     Section 10.06 GOVERNING LAW; JURISDICTION AND SERVICE OF PROCESS; DISPUTE
RESOLUTION.

          (a) GOVERNING LAW. This Agreement shall be governed and construed in
accordance with the laws of the Commonwealth of Virginia without regard to any
applicable principles of conflicts of law; PROVIDED,  HOWEVER, that the Merger
shall  comply  with  and  be  governed  by  Section  1103  of  the  California
Corporations Code.

          (b)  JURISDICTION  AND SERVICE OF PROCESS.  ANY ACTION OR PROCEEDING
SEEKING TO ENFORCE  ANY  PROVISION  OF, OR BASED ON ANY RIGHT  ARISING OUT OF,
THIS  AGREEMENT,  INCLUDING  ANY  MEDIATION OR BINDING  ARBITRATION,  SHALL BE
BROUGHT AGAINST ANY OF THE PARTIES HERETO IN THE COUNTY AND THE STATE IN WHICH
THE  DEFENDANT  OR ADVERSE  PARTY IN SUCH ACTION OR  PROCEEDING  RESIDES OR IS
DOMICILED.  EACH OF THE PARTIES HERETO CONSENTS TO THIS JURISDICTION PROVISION
IN ANY SUCH  ACTION OR  PROCEEDING  AND  WAIVES  ANY  OBJECTION  TO VENUE LAID
THEREIN.  PROCESS IN ANY ACTION OR  PROCEEDING  REFERRED  TO IN THE  PRECEDING
SENTENCE MAY BE SERVED ON ANY PARTY HERETO ANYWHERE IN THE WORLD.


                                      41

<PAGE>

          (c) DISPUTE RESOLUTION. (i) MEDIATION. If a claim, disagreement,  or
dispute arises or exists between the parties to this Agreement with respect to
the  interpretation,  performance  or  enforcement of any term or condition of
this   Agreement   not   governed  by  the  Escrow   Agreement   (hereinafter,
"Disagreement"),  any party to this Agreement may require the other party that
is involved in the Disagreement to submit the reasons for his position(s),  in
writing, and then enter into good faith negotiations to attempt to resolve the
Disagreement.   If  such   Disagreement   cannot  be  settled  by  good  faith
negotiations  between the parties, and if the continued failure to settle such
Disagreement  is likely to have a material  adverse  impact on the Business of
either  AMBIA  or  Infodata  (as  determined  in  the  reasonable  good  faith
discretion of the Board of Directors of Infodata),  both of the parties to the
Disagreement  may elect in  writing to submit the  Disagreement  to  mediation
under the Commercial Mediation Rules of the American Arbitration  Association.
The  mediator  shall be chosen by each  party's  respective  counsel or by the
parties  themselves,  within  ten (10) days  after the  written  notice of the
election  to mediate is made.  In the event no mediator  can be chosen  within
such  ten-day  period or upon  termination  of the  mediation  by the mediator
without a mutually  satisfactory  resolution of the Disagreement,  the parties
shall proceed to binding  arbitration as described under Section  10.06(c)(ii)
below.  The  mediator  shall end the  mediation  whenever,  in the  mediator's
judgment, further efforts at mediation would not contribute to a resolution of
the  Disagreement.  The  mediator  shall  not have the  authority  to impose a
settlement on the parties to the Disagreement, but will attempt to assist them
reach a satisfactory resolution of the Disagreement.

               (ii) BINDING ARBITRATION.  If the parties to a Disagreement are
unable  to  resolve  the   Disagreement   between  them  pursuant  to  Section
10.06(c)(i)  within thirty (30) days of the making of the written  election to
mediate or sooner if the  parties  mutually  agree,  or if a  mediator  is not
appointed  within the time frame set forth in that Section,  either party to a
Disagreement may submit the  Disagreement to arbitration  unless the amount of
the Loss in question involves pending  litigation with a third party, in which
event  arbitration  shall not be commenced until such amount is ascertained or
both parties to the  Disagreement  agree to arbitration.  Any such arbitration
shall be conducted in accordance with the Commercial  Arbitration Rules of the
American  Arbitration  Association  then pertaining (the "Rules"),  insofar as
such Rules are not inconsistent with the terms and provision set forth in this
Agreement,  unless the parties mutually agree  otherwise,  and pursuant to the
following procedures

               (A) The  Disagreement  shall be settled by a panel of three (3)
arbitrators.  Each of the  parties to the  Disagreement  shall each select one
arbitrator,  and  the  two  arbitrators  so  selected  shall  select  a  third
arbitrator.  The  arbitrators  shall set a limited  time period and  establish
procedures  designed to reduce the cost and time for discovery  while allowing
the parties an opportunity,  adequate in the sole judgment of the arbitrators,
to discover  relevant  information from the opposing parties about the subject
matter of the Disagreement.  The arbitrators shall rule upon motions to compel
or limit discovery and shall have the authority to impose sanctions, including
reasonable  attorney's  fees and costs,  to the extent as a court of competent
law or equity,  should the  arbitrators  determine  that  discovery was sought
without  substantial  justification  or that it was  refused  or  objected  to
without  substantial  justification.  The  decision of a majority of the three
arbitrators as to the validity and the amount of any claim


                                      42

<PAGE>

involved in a Disagreement shall be binding and conclusive upon the parties to
this  Agreement.  Such  decision  shall be written and shall be  supported  by
written  findings  of fact  and  conclusions  which  shall  state  the  award,
judgment, decree or order of the arbitrators.

               (B) Judgment upon any award rendered by the  arbitrators may be
entered in any court having  jurisdiction,  as determined in Section  10.06(b)
above. Any such arbitration shall be held in the county and state of residence
or domicile of the party  against whom the  Disagreement  was first  asserted,
under the rules then in effect of the American  Arbitration  Association.  For
purposes of this  Section  10.06(c)(ii):  (i)  Infodata  shall be deemed to be
domiciled in Fairfax County,  Virginia,  and the Shareholders and SPI shall be
deemed to be domiciled in  Pleasanton,  California,  unless such domiciles are
modified  by a signed  amendment  to this  Agreement  executed  by all parties
hereto;  and,  (ii) in any  arbitration  hereunder  in which  any claim or the
amount  thereof  stated in a written  notice  is at issue,  Infodata  shall be
deemed to be the non-prevailing  party in the event that the arbitrators award
Infodata less than the sum of one-half  (1/2) of the disputed  amount plus any
amounts not in dispute;  otherwise,  the  Shareholders  shall be deemed to the
non-prevailing  party. The  non-prevailing  party to an arbitration  hereunder
shall pay its own expenses,  the fees of the arbitrators,  the  administrative
fee of the American  Arbitration  Association,  and the  expenses,  including,
without  limitation,  reasonable  attorneys'  fees and costs,  incurred by the
other party to the arbitration.

     Section 10.07 PUBLICITY. Except as otherwise required by law or the rules
of any  national  securities  exchange,  for so long as this  Agreement  is in
effect,  neither  AMBIA  nor  Infodata  shall,  or  shall  permit  any  of its
subsidiaries  to, issue or cause the publication of any press release or other
public  announcement  with respect to the  transactions  contemplated  by this
Agreement without prior consultation with the other party.

     Section 10.08 PARTIES IN INTEREST.  This Agreement  shall be binding upon
and inure  solely to the  benefit of each party  hereto,  and  nothing in this
Agreement,  express or implied,  is intended to or shall confer upon any other
person or persons  any rights,  benefits or remedies of any nature  whatsoever
under or by reason of this  Agreement,  except pursuant to Sections 5.09, 5.10
and 5.11 hereof.  Infodata shall cause  Acquisition to perform its obligations
hereunder.


                    [The next page is the signature page.]


                                      43

<PAGE>

     IN WITNESS WHEREOF, AMBIA, SPI, Infodata the Shareholders and Acquisition
have caused this Agreement to be signed by their respective officers thereunto
duly authorized as of the date first written above.

 ATTEST/WITNESS:                           AMBIA CORPORATION


 /s/ALAN FISHER                            By: /s/ALAN FISHER           [SEAL]
 --------------------------------------        --------------------------
 Alan Fisher, Secretary                        Alan Fisher, President



                                           INFODATA SYSTEMS INC.


 /s/CURTIS D.  CARLSON                     By: /s/HARRY KAPLOWITZ       [SEAL]
 --------------------------------------        --------------------------
 Curtis D. Carlson, Assistant Secretary        Harry Kaplowitz, President



                                           AMBIA ACQUISITION CORPORATION


 /s/CURTIS D.  CARLSON                     By: /s/HARRY KAPLOWITZ       [SEAL]
 --------------------------------------        --------------------------
 Curtis D. Carlson, Assistant Secretary        Harry Kaplowitz, President



                                           SOFTWARE PARTNERS, INC.


 /s/ALAN FISHER                            By: /s/ALAN FISHER           [SEAL]
 --------------------------------------        --------------------------
 Alan Fisher, Secretary                        Alan Fisher, President



                                               /s/ALAN FISHER           [SEAL]
 --------------------------------------        --------------------------
                                               Alan Fisher


                                               /s/RAZI MOHIUDDIN        [SEAL]
 --------------------------------------        --------------------------
                                                Razi Mohiuddin




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