PLAN AND AGREEMENT OF MERGER


        This  Plan and  Agreement  of  Merger,  dated as of March 10,  1995,  is
executed and entered into pursuant to the New York Business  Corporation Law and
the Virginia Stock  Corporation Act, by and between Infodata Systems Inc., a New
York Corporation  ("Infodata"),  and Virginia Infodata Systems, Inc., a Virginia
Corporation  and a wholly-owned  subsidiary of Infodata  ("Infodata  Virginia"),
such  corporations  being  hereinafter  sometimes  collectively  referred as the
"Constituent Corporations."

                                   WITNESSETH

        WHEREAS,  Infodata Virginia is a corporation duly organized and existing
under the laws of the State of Virginia,  having been  incorporated  on March 9,
1995, and having an authorized  capital stock of (i) 3,333,333  shares of common
stock,  par  value  $.03 per  share,  of  which  1,000  shares  are  issued  and
outstanding  and which  1,000  shares are owned by  Infodata,  and (ii)  500,000
shares of preferred stock, par value $1.00 per share,  none of which are issued;
and

        WHEREAS, Infodata is a corporation duly organized and existing under the
laws of the State of New York,  having been  originally  incorporated on May 13,
1968,  and having a current  authorized  capital  stock of  3,333,333  shares of
common stock,  par value $.03 per share,  of which 604,874 shares are issued and
outstanding,  and 500,000 shares of preferred  stock, par value $1.00 per share,
of which 133,500 shares are issued and outstanding; and

        WHEREAS,  the  respective  Boards of  Directors of Infodata and Infodata
Virginia deem it advisable and in the best interests of said  corporations  that
Infodata be merged with and into Infodata Virginia as the surviving  corporation
as authorized  by the statutes of the States of New York and Virginia  under and
pursuant to the terms and  conditions  hereinafter  set forth,  and each of such
boards has duly approved this form of Plan and Agreement of Merger (the "Plan").

         NOW,  THEREFORE,  in consideration of the promises and mutual covenants
and agreements herein contained,  and for the purpose of setting forth the terms
and  conditions of said merger,  the mode of carrying the same into effect,  the
manner and basis of converting the shares of each  Constituent  Corporation into
shares of the  Surviving  Corporation  (as  hereinafter  defined) and such other
details and provisions as are deemed necessary or desirable,  the parties hereto
have agreed and do hereby agree, subject to the approval or adoption of the Plan
by the requisite vote of the shareholders of each Constituent Corporation and to
the conditions hereinafter set forth, as follows:

                                    ARTICLE I
                    MERGER AND NAME OF SURVIVING CORPORATION

        At the Effective Time of the merger (as hereinafter  defined),  Infodata
shall be merged with and into Infodata  Virginia,  which is hereby designated as
the "Surviving  Corporation"  which shall continue its corporate  existence as a
Virginia  corporation  to be governed by the laws of the State of Virginia,  the
name of which shall be changed to Infodata Systems Inc. and which shall maintain
a registered office in the State of Virginia at 12150 Monument Drive (Suite 400)
Fairfax,  Virginia 22033. The registered  agent of the Surviving  Corporation at
such address shall be Harry Kaplowitz, President of the Surviving Corporation.


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                                   ARTICLE II
                         TERMS AND CONDITIONS OF MERGER

        The terms and  conditions  of the merger (in addition to those set forth
elsewhere in the Plan) are as follows;

(a) Upon and following the Effective Time of the merger:

     (1) The Constituent Corporations shall be merged into a single corporation,
which shall be  Infodata  Virginia,  the  corporation  designated  herein as the
Surviving Corporation.

     (2) The separate existence of Infodata shall cease.

     (3) The Surviving  Corporation  shall thereupon and thereafter  possess all
the rights,  privileges,  powers, immunities and franchises, of a public as well
as of a private nature, and be subject to all the restrictions, disabilities and
duties of each Constituent Corporation;  and the rights, privileges,  powers and
franchises of each Constituent Corporation, and all property, real, personal and
mixed, and all debts due to either Constituent  Corporation on whatever account,
including  subscriptions  for stock,  and all other choses in action and all and
every other interest, of or belonging to each Constituent Corporation,  shall be
taken and deemed to be  transferred  to and vested in the Surviving  Corporation
without further act or deed; and all property,  rights,  privileges,  powers and
franchises,  and all and every other interest shall be thereafter as effectually
the  property  of the  Surviving  Corporation  as they  were  of the  respective
Constituent  Corporations,  and the title to any real  estate  vested by deed or
otherwise in either  Constituent  Corporation  shall not revert or be in any way
impaired by reason of the merger, but all rights of creditors and all liens upon
any property of either  Constituent  Corporation shall be preserved  unimpaired,
and all debts, liabilities and duties of the respective Constituent Corporations
shall  thenceforth  attach  to the  Surviving  Corporation  and may be  enforced
against it to the same extent as if said debts,  liabilities and duties had been
incurred or contracted by it.  Specifically,  but not by way of limitation,  the
Surviving Corporation shall be responsible and liable to dissenting shareholders
of  Infodata  and  any  action  or  proceeding   whether   civil,   criminal  or
administrative,  pending by or against either  Constituent  Corporation shall be
prosecuted as if the merger had not taken place,  or the  Surviving  Corporation
may be substituted in such action or proceeding.

     (4)  All  corporate  acts,  plans,  policies,   contracts,   approvals  and
authorizations of Infodata and its shareholders,  Board of Directors, committees
elected or appointed by the Board of Directors,  officers and agents, which were
valid and effective  immediately prior to the Effective Time of the merger shall
be taken for all purposes as the acts, plans, policies, contracts, approvals and
authorizations  of the  Surviving  Corporation  and  shall be as  effective  and
binding  thereon as the same were with  respect to  Infodata.  The  employees of
Infodata shall become the employees of the Surviving Corporation and continue to
be entitled to the same rights and  benefits  which they enjoyed as employees of
Infodata.

     (5) The assets,  liabilities,  reserves  and  accounts of each  Constituent
Corporation  shall be recorded on the books of the Surviving  Corporation at the
amounts at which they, respectively,  shall then be carried on the books of such
Constituent   Corporation   subject  to  such  adjustments  or  eliminations  of
intercompany items as may be appropriate in giving effect to the merger.

     (6) All obligations of Infodata under any and all employee benefit plans in
effect as of the Effective Time of the merger, or with respect to which employee
rights or  accrued  benefits  are  outstanding  as of such time,  including  the
assumption of all  outstanding  stock options  issued under the Incentive  Stock
Option Plan and the  Non-Qualified  Stock Option Plan of Infodata,  the proposed
1995 Stock  Option Plan of  Infodata,  if adopted,  and any  warrants  issued by
Infodata  pursuant  to its Stock  Warrant  Purchase  Plan,  shall be  assumed by
Infodata  Virginia as of the Effective  Time of the merger;  provided,  however,
that the common stock of Infodata Virginia shall be substituted for common stock
of Infodata thereunder, without any action on the part 


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of the holder  thereof.  As of the Effective Time of the merger,  Infodata shall
adopt and  continue in effect all such  employee  benefit  and warrant  purchase
plans, upon the same terms and conditions as were in effect immediately prior to
the merger and Infodata Virginia shall reserve that number of shares of Infodata
Virginia  common stock which is equal to the number of shares of common stock of
Infodata  that is  reserved  under  any and all  employee  benefit  and  warrant
purchase plans of Infodata as of the Effective Time of the merger.

     (b) The Board of Directors,  and the members thereof, the committees of the
Board of  Directors,  and the  members  thereof,  and the  officers  of Infodata
immediately  prior to the Effective  Time of the merger shall be and  constitute
the Board of Directors,  and the members thereof, the committees of the Board of
Directors,   and  the  members  thereof,  and  the  officers  of  the  Surviving
Corporation,  respectively,  to  serve in  accordance  with  the  Bylaws  of the
Surviving  Corporation  until their  respective  successors shall have been duly
elected and qualified.

                                   ARTICLE III
                     CAPITALIZATION OF SURVIVING CORPORATION
                    AND MANNER AND BASIS OF CONVERTING SHARES

        The total authorized capital stock of the Surviving Corporation shall be
as set forth in the Articles of Incorporation of the Surviving Corporation, that
is 3,333,333 shares of common stock, $.03 par value per share (the "Common Stock
of Surviving  Corporation"),  and 500,000 shares of preferred  stock,  $1.00 par
value per share (the "Preferred Stock of Surviving Corporation").

        The  manner  and  basis  of  converting   shares  of  each   Constituent
Corporation  into shares of the Surviving  Corporation  and the mode of carrying
the merger into effect are as follows:

        (a) The 1,000 shares of common stock of Infodata Virginia owned and held
by Infodata  immediately prior to the Effective Time of the merger shall, at the
Effective Time of the merger, be deemed to have been cancelled immediately prior
thereto  and no stock of the  Surviving  Corporation  shall be issued on account
thereof.

        (b) At the Effective  Time of the merger,  each share of common stock of
Infodata outstanding at the Effective Time of the merger shall be converted into
one  fully  paid and  nonassessable  share  of  Common  Stock  of the  Surviving
Corporation,  without  any action on the part of the holder  thereof.  After the
Effective Time of the merger,  each holder of an outstanding  certificate  which
prior thereto  represented shares of common stock of Infodata shall be entitled,
upon  surrender  thereof  to any  transfer  agent  for the  Common  Stock of the
Surviving  Corporation,  to  receive  in  exchange  therefor  a  certificate  or
certificates  representing the number of shares of Common Stock of the Surviving
Corporation into which the shares of the common stock of Infodata so surrendered
shall have been converted as aforesaid of such  denominations  and registered in
such  names  as such  holder  may  request.  Until  so  surrendered,  each  such
outstanding  certificate  which,  prior  to the  Effective  Time  of the  merger
represented  shares of common stock of Infodata shall for all purposes  evidence
the  ownership of the shares of Common Stock of the Surviving  Corporation  into
which such shares shall have been so converted.

     (c) At the Effective Time of the merger,  each share of preferred  stock of
Infodata outstanding at the Effective Time of the merger shall be converted into
one  fully-paid  and  nonassessable  share of Preferred  Stock of the  Surviving
Corporation,  without  any action on the part of the holder  thereof.  After the
Effective Time of the merger,  each holder of an outstanding  certificate  which
prior  thereto  represented  shares  of  preferred  stock of  Infodata  shall be
entitled upon surrender thereof to any transfer agent for the Preferred Stock of
the Surviving  Corporation,  to receive in exchange  therefore a certificate  or
certificates  representing  the  number  of  shares  of  Preferred  Stock of the
Surviving  Corporation  into which the shares of preferred  stock of Infodata so
surrendered  shall have been converted as aforesaid,  of such  denominations and
registered in such names as such holder may request. Until so surrendered,  each
such outstanding  certificate  which, prior to the Effective Time of the merger,
represented  shares  of  preferred  stock of  Infodata  shall  for all  purposes
evidence the ownership of shares of Preferred Stock of the Surviving Corporation
into which such shares shall have been so converted.


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        (d) All  shares of Common  Stock and  Preferred  Stock of the  Surviving
Corporation  into which shares of common stock and  preferred  stock of Infodata
shall have been  converted  pursuant to this ARTICLE III shall be issued in full
satisfaction of all rights pertaining to such converted shares.

        (e) If any  certificate of shares of Common Stock or Preferred  Stock of
the Surviving Corporation is to be issued in a name other than that in which the
certificate  surrendered  in exchange  therefore  is  registered,  it shall be a
condition of the issuance  thereof that the certificate so surrendered  shall be
properly  endorsed and otherwise in proper form for transfer and that the person
requesting  such  exchange  pay  to  the  Surviving  Corporation  or  any  agent
designated by it any transfer or other taxes  required by reason of the issuance
of a certificate  for shares of Common Stock or Preferred Stock of the Surviving
Corporation  in any  name  other  than  that  of the  registered  holder  of the
certificate  surrendered,  or establish  to the  satisfaction  of the  Surviving
Corporation or any agent  designated by it that such tax has been paid or is not
payable.

        (f)  Notwithstanding the provisions of this ARTICLE III, any outstanding
shares of common stock or preferred stock of Infodata held by  shareholders  who
shall have elected to dissent from the merger and who shall have  exercised  and
perfected  appraisal  rights  with  respect to such  shares in  accordance  with
Section 623 of the New York Business Corporation Law ("Dissenting Shareholders")
shall not be converted  into shares of Common  Stock or  Preferred  Stock of the
Surviving  Corporation but shall be entitled to receive only such  consideration
as shall be provided in said Section 623, except that common stock and preferred
stock of Infodata  outstanding at the Effective Time of the merger and held by a
Dissenting  Shareholder  who shall  thereafter  withdraw his election to dissent
from the merger or lose his right to dissent from the merger as provided in said
Section 623,  shall be deemed  converted as of the Effective Time of the merger,
into such number of shares of Common Stock or Preferred  Stock of the  Surviving
Corporation  as such holder  otherwise  would have been entitled to receive as a
result of the merger.

                                   ARTICLE IV
                      ARTICLES OF INCORPORATION AND BYLAWS

        (a) The Articles of Incorporation  of Infodata  Virginia as existing and
constituted  immediately  prior to the Effective Time of the merger shall,  upon
the merger's becoming effective, be and constitute the Articles of Incorporation
of the Surviving Corporation until amended in the manner provided by law.

        (b)  The  Bylaws  of  Infodata  Virginia  as  existing  and  constituted
immediately  prior to the Effective Time of the merger shall,  upon the merger's
becoming  effective,  be and constitute the Bylaws of the Surviving  Corporation
until amended in the manner provided by law.

                                    ARTICLE V
                     OTHER PROVISIONS WITH RESPECT TO MERGER

        (a) The Plan shall be submitted to the  shareholders of each Constituent
Corporation  as  provided by the  applicable  laws of the States of New York and
Virginia,  respectively.  As soon as practicable after the approval and adoption
thereof by the shareholders of each  Constituent  Corporation in accordance with
the  requirements  of the laws of the  States of New York and  Virginia  and the
obtaining of all necessary regulatory approvals, all required documents shall be
executed,  filed and recorded  and all  required  acts shall be done in order to
accomplish  the merger under the  provisions of the  applicable  statutes of the
States of New York and Virginia.

        (b) The Plan may be terminated  at any time prior to the Effective  Time
of the merger, whether before or after action thereon by the shareholders of the
Constituent Corporations, (i) by mutual consent of the Constituent Corporations,
expressed by action of their respective Boards of Directors,  (ii) by consent of
Infodata,  expressed by action of its Board of Directors, if the holders of more
than 5% of the outstanding  shares of common stock of Infodata 

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elect to exercise the right to dissent under  applicable  provisions of New York
law in connection with the merger contemplated hereby, or (iii) by action of the
Board of Directors of either of the Constituent  Corporations if there shall not
have been  received  an opinion of counsel to the effect  that (A) the merger of
Infodata  and   Infodata   Virginia  as  provided   herein  will   constitute  a
reorganization  under the Internal Revenue Code of 1986, as amended, (B) no gain
or loss will be recognized by the  shareholders  of Infodata upon the conversion
in the merger of their  existing  capital  stock into capital  stock of Infodata
Virginia,  (C) the tax basis of the shares of stock of the Surviving Corporation
received by the  shareholders  of Infodata  will be the same as the tax basis of
the shares of capital  stock of  Infodata  exchanged  therefor,  (D) the holding
period of the shares of capital stock received by the  shareholders  of Infodata
will  include  the  holding  period of the shares of capital  stock of  Infodata
exchanged therefor,  provided that such shares of capital stock of Infodata were
held as capital assets at the Effective Time of merger, (E) no gain or loss will
be recognized  by Infodata  Virginia or Infodata as the result of the receipt by
Infodata  Virginia  of all the  assets of  Infodata  in  exchange  for shares of
capital stock of Infodata  Virginia and the  assumption by Infodata  Virginia of
all the  liabilities of Infodata and (F) the tax basis of the assets of Infodata
acquired by Infodata Virginia pursuant to the merger will be the same as the tax
basis and holding  period of those  assets in the hands of Infodata  immediately
prior to the Effective Time of the merger.

        (c) If the merger is consummated,  the Surviving  Corporation shall bear
and pay all costs and expenses incurred by each of the Constituent Corporations.
If the merger is not consummated,  each Constituent  Corporation  shall bear and
pay all costs and expenses incurred by it or on its behalf.

        (d) The Surviving Corporation,  from and after the Effective Time of the
merger,  agrees that it may be sued and served with  process in the State of New
York in any  proceeding  for  the  enforcement  of the  rights  of a  Dissenting
Shareholder  of  Infodata  against  the  Surviving  Corporation.  The  Surviving
Corporation  irrevocably  appoints the Secretary of the State of New York as its
agent to  accept  service  of  process  in any such  proceeding.  The  Surviving
Corporation  will promptly pay to the  Dissenting  Shareholders  of Infodata the
amounts,  if any,  to which they shall be entitled  under the New York  Business
Corporation Law with respect to the rights of Dissenting Shareholders,  provided
such Dissenting Shareholders act in strict compliance with the provisions of the
New York Business Corporation Law governing rights of Dissenting Shareholders in
the case of a merger.

        (e) Infodata shall duly convene the 1995 Annual Meeting of  Shareholders
of Infodata (the "Annual Meeting") in connection with which, among other things,
the approval by such shareholders of the Plan and the transactions  contemplated
hereby,  shall be solicited.  Infodata shall use its reasonable  best efforts to
obtain such approval.  Infodata,  as the sole shareholder of Infodata  Virginia,
shall consent in writing to the  execution of this Plan promptly  after the date
of this Plan.


                                   ARTICLE VI
                    APPROVAL AND EFFECTIVE TIME OF THE MERGER


        (a) The merger shall become  effective  when all the  following  actions
shall have been taken

               (1) The Plan shall be adopted  and  approved  by the  affirmative
        vote of the  holders of  two-thirds  of the shares of  Infodata  capital
        stock outstanding at the record date of the Annual Meeting in accordance
        with the New York Business Corporation Law,

               (2) Articles of Merger setting forth the information required by,
        and executed  and verified in  accordance  with,  the New York  Business
        Corporation Law, shall be filed in the office of the Department of State
        of the State of New York, and

               (3) The Plan,  when executed and  acknowledged in accordance with
        the Virginia Stock  Corporation Act, shall be filed in the office of the
        Secretary  of State of the State of Virginia  (the  particular  time 


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and date of  filing  of the Plan  with the  Secretary  of State of the  State of
Virginia being herein referred to as the "Effective Time")

        (b) The Surviving Corporation shall cause duplicate, certified copies of
the Plan to be filed in the  office  of the  Secretary  of State of the State of
Virginia and with the  Department  of State of the State of New York.  If at any
time the  Surviving  Corporation  shall  consider or be advised that any further
assignment  or  assurance  in law or other  action is  necessary or desirable to
vest,  perfect or confirm in the Surviving  Corporation  the title, or record or
otherwise,  to any property or rights of Infodata  acquired or to be acquired by
or as a result of the merger,  the proper officers and directors of Infodata and
the Surviving Corporation,  respectively, shall be and they hereby are severally
and fully  authorized  to  execute  and  deliver  such  deeds,  assignments  and
assurances  in law and take such other  action as may be  necessary or proper in
the name of Infodata or the Surviving  Corporation  to vest,  perfect or confirm
title to such  property or rights in the  Surviving  Corporation  and  otherwise
carry out the purposes of the Plan.

        (c) For the  convenience of the parties and to facilitate the filing and
recording of the Plan, any number of  counterparts  hereof may be executed,  and
each such counterpart shall be deemed to be an original instrument.

        (d) The Plan and the legal relations between the parties hereto shall be
governed by and construed in  accordance  with the laws of the State of Virginia
except  insofar as the internal  law of the State of New York shall  mandatorily
apply to the merger.

        (e) The  Plan  cannot  be  altered  or  amended  except  pursuant  to an
instrument in writing signed on behalf of the parties hereto.

        IN WITNESS WHEREOF,  Infodata  Virginia has caused the Plan to be signed
by its Chief  Executive  Officer and its Secretary and its corporate  seal to be
affixed hereto pursuant to  authorization  contained in a resolution  adopted by
its Board of Directors  approving the Plan,  and Infodata has caused the Plan to
be signed by its Chief  Executive  Officer and its  Secretary  and its corporate
seal to be affixed hereto  pursuant to  authorization  contained in a resolution
adopted  by its Board of  Directors  approving  the Plan,  all on the date first
above written.

VIRGINIA INFODATA SYSTEMS INC.                     INFODATA SYSTEMS INC.
        a Virginia corporation                        a New York corporation



By HARRY KAPLOWITZ                            By   HARRY KAPLOWITZ
   ----------------------                          ---------------------
    Harry Kaplowitz                                Harry Kaplowitz
    President                                      President



    DAVID A. KARISH                                DAVID A. KARISH
    ---------------------                          ---------------------
    David A. Karish                                David A. Karish
    Senior Vice President                          Senior Vice President
    and Secretary/Treasurer                        and Secretary/Treasurer


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