LANDMARK GRAPHICS CORP
8-K, 1996-07-05
COMPUTER INTEGRATED SYSTEMS DESIGN
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION

                            Washington, D.C. 20549

                               _________________



                                   FORM 8-K

                                CURRENT REPORT


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

                                 JUNE 30, 1996
                                Date of Report
                       (Date of earliest event reported)


                         LANDMARK GRAPHICS CORPORATION
            (Exact name of registrant as specified in its charter)

           DELAWARE                    0-17195                 76-0029459
(State of other jurisdiction of      (Commission            (I.R.S. Employer
incorporation or organization)       File Number)         Identification Number)


                             15150 MEMORIAL DRIVE
                                HOUSTON, TEXAS
                   (Address of principal executive offices)

                                  77079-4304
                                  (Zip Code)

                                (713) 560-1000
             (Registrant's telephone number, including area code)
<PAGE>
 
ITEM 5.  OTHER EVENTS.

     On June 30, 1996, Landmark Graphics Corporation ("Landmark"), Halliburton
Company ("Halliburton") and Halliburton Acq. Company ("Merger Sub") entered into
an Agreement and Plan of Merger (the "Merger Agreement"), pursuant to which the
parties propose to merge Landmark  with and into Merger Sub.  As a result of
such merger (the "Merger"), Landmark will become a wholly-owned subsidiary of
Halliburton.  Pursuant to the Merger, each share (other than shares held by
Landmark, Halliburton or their respective wholly-owned subsidiaries (which will
be cancelled)) of the $0.05 par value per share common stock (the "Landmark
Common Stock") of Landmark which is issued and outstanding at the time the
Merger becomes effective (the "Effective Time"), will be converted into the
right to receive, upon surrender of the underlying certificate(s) representing
shares of Landmark Common Stock, whole shares of the $2.50 par value per share
common stock ("Halliburton Common Stock") of Halliburton (computed based upon an
exchange ratio of 0.574 share of Halliburton Common Stock for each share of
Landmark Common Stock) and cash in lieu of fractional shares of Halliburton
Common Stock which would otherwise be issuable.  Upon surrender of such
certificates, Halliburton will also cause to be paid to the holder thereof any
dividends or other distributions with both a record date which is subsequent to
the Effective Time and a payment date which is prior to the surrender of such
certificate(s).

     The Merger was unanimously approved by each party's Board of Directors and
by Halliburton (as the sole stockholder of Merger Sub).  In the case of
Landmark, such approval is subject to the approval of the Merger by the
stockholders of Landmark.  The Merger is also subject to antitrust review
pursuant to the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
amended.

     The parties anticipate that the Merger will be completed in the fourth
quarter of the 1996 calendar year.

     The Merger is intended to qualify as reorganization (within the meaning of
Section 368(a) of the Internal Revenue Code of 1986, as amended) and, for
financial accounting purposes, the parties intend to account for the Merger as a
"pooling of interests."

     The Merger Agreement obligates Landmark to take all actions necessary to
promptly convene a special meeting (the "Special Meeting") of its stockholders
to consider a proposal to approve the Merger.

     The Merger Agreement may be terminated (i) by the mutual consent of
Landmark and Halliburton, (ii) by Landmark, if Halliburton breaches the Merger
Agreement and fails to cure such breach, (iii) by Halliburton, if Landmark
breaches the Merger Agreement and fails to cure such breach, (iv) by either
Landmark or Halliburton, if any order is entered which prevents consummation of
the Merger; provided that the party seeking to terminate the Merger Agreement
has used reasonable efforts to prevent the entry of such order and to obtain the
termination of such order, (v) by either Landmark or Halliburton, if the Merger
has not been consummated by

                                      -1-
<PAGE>
 
December 31, 1996; provided, the Merger Agreement may be extended by either
Landmark or Halliburton to a date not later than February 28, 1997, if the
failure to consummate the Merger by December 31, 1996 is attributable to the
failure to receive all required governmental approvals or as a result of the
entry of an order preventing the consummation of the Merger, (vi) by either
Landmark or Halliburton, if the stockholders of Landmark do not approve the
Merger, (vii) by Halliburton, if (a) the Board of Directors of Landmark
withdraws or modifies its recommendation of the Merger in a manner which is
materially adverse to Halliburton or resolves to do so or if the Board of
Directors of Landmark recommends to the stockholders of Landmark a transaction
between a third party and Landmark or any of its subsidiaries which involves a
merger, consolidation, share exchange, business combination or similar
transaction or the acquisition by such third party of a material equity interest
in any voting securities of or a substantial portion of the assets of Landmark
or any of its significant subsidiaries (a "Competing Transaction"), (b) a tender
or exchange offer for 50% or more of the issued and outstanding Landmark Common
Stock is commenced and the Board of Directors of Landmark fails, within 10 days
thereafter, to recommend against the acceptance of such offer or to take a
position with respect to such offer or (c) any third party acquires or obtains
the right to acquire 50% or more of the then issued and outstanding shares of
Landmark Common Stock or (viii) by Landmark if it accepts a tender or exchange
offer for all of the outstanding capital stock of Landmark, a merger or a sale
of all or substantially all of the assets of Landmark on terms with the Board of
Directors of Landmark determines to be more favorable to the stockholders of
Landmark than is the Merger (a "Superior Proposal") and pays to Halliburton the
sum of $18 million.

     Landmark is obligated to pay to Halliburton the sum of $18 million (the
"Break-up Fee") under the following circumstances:

     (i)   if the Merger Agreement is terminated as a result of the failure of
the Merger to be approved by the stockholders of Landmark and, between July 1,
1996 and the date of the Special Meeting (a) Landmark shall have provided
information to or entered into negotiations with a third party with respect to a
Competing Transaction involving Landmark or its subsidiaries and (b) the Board
of Directors of Landmark shall not have re-affirmed its recommendation for the
approval of the Merger;

     (ii)  if Halliburton terminates the Merger Agreement pursuant to clauses
(vii) (a) or (b) of the immediately preceding paragraph;

     (iii) if Landmark terminates the Merger Agreement pursuant to clause (viii)
of the immediately preceding paragraph;

     (iv)  if within 12 months after the termination of the Merger Agreement
any third party acquires 50% or more of the issued and outstanding Landmark
Common Stock and (a) the value of the consideration received by the stockholders
of Landmark (on a per share basis) pursuant to such transaction is greater than
the value of the consideration to be received by the stockholders of Landmark
(on a per share basis) pursuant to the Merger or (b) such transaction shall be
on more favorable terms to the stockholders of Landmark than is the Merger; or

                                      -2-
<PAGE>
 
     (v)  if (a) Halliburton terminates the Merger Agreement as a result of the
intentional or willful breach of the Merger Agreement by Landmark and (b) either
(x) within 12 months after such termination Landmark enters into an agreement
providing for a business combination with a third party (to which Landmark has
provided information regarding a business combination or commenced negotiations
with respect to a business combination during the period commencing January 1,
1995 and ending on the date of the termination of the Merger Agreement) which
contemplates the payment to Landmark or its stockholders of consideration having
a higher value than the consideration payable to the stockholders of Landmark
pursuant to the Merger Agreement or such transaction is on more favorable terms
to the stockholders of Landmark than is the Merger or (y) within 12 months
following the termination of the Merger Agreement any third party acquires 50%
or more of the issued and outstanding Landmark Common Stock pursuant to a
transaction in which the stockholders of Landmark receive higher consideration
per share than the consideration per share to be received by such stockholders
pursuant to the Merger or such transaction is on more favorable terms to the
stockholders of Landmark than is the Merger.  For purposes of the Merger
Agreement, the consideration per share to be received by the stockholders of
Landmark will be deemed to be $31.857.

     Simultaneously with the execution and delivery of the Merger Agreement,
Landmark and Halliburton executed and delivered a Stock Option Agreement (herein
so called) pursuant to which, Landmark granted Halliburton an option (the
"Option") to purchase up to such number of shares ("Option Shares") of Landmark
Common Stock as is equal to 15% of the then issued and outstanding shares of
Landmark Common Stock at a price of $31.857 per share.  The Option first becomes
exercisable upon the occurrence of an Exercise Event (as hereinafter defined).
Subject to the expiration of the Option, the Stock Option Agreement also grants
Halliburton the right to require, upon the occurrence of Repurchase Event (as
hereinafter defined), Landmark to repurchase the Option and the Option Shares
purchased pursuant to the Stock Option Agreement which are then owned by
Halliburton at a price equal to the sum of (a) the aggregate price paid by
Halliburton for Option Shares then owned by Halliburton and (b) the excess of
the Applicable Price (as hereinafter defined) over the Exercise Price multiplied
by the number of Option Shares not yet issued upon exercise of the Option;
provided that Halliburton may not exercise such right in a manner that would
result in the cash payment to Halliburton of an aggregate amount in excess of
$24 million, including any Break-up Fee paid by Landmark.  As used herein, the
term "Exercise Event" will be deemed to mean (i) any third party shall have
commenced or filed a registration statement under the Securities Act of 1933, as
amended (the "Securities Act"), with respect to a tender offer or exchange offer
to acquire 25% or more of the then outstanding shares of Landmark Common Stock,
(ii) Landmark or any of its subsidiaries shall have recommended or announced an
intention to recommend approval of or entered into an agreement with a third
party to (a) effect a merger, consolidation, share exchange or similar
transaction involving Landmark or any of its significant subsidiaries, (b) sell,
lease or otherwise dispose of assets of Landmark or its subsidiaries
representing 15% or more of the consolidated assets of Landmark and its
subsidiaries or (c) issue, sell or otherwise dispose of securities representing
15% or more of the voting power of Landmark or any of its significant
subsidiaries, (iii) any third party acquires or obtains the right to acquire 25%
or more of the then outstanding Landmark Common Stock or (iv) the stockholders
of Landmark do not approve the Merger at the Special Meeting

                                      -3-
<PAGE>
 
or the Special Meeting is not held and prior to such time (a) a third party
shall have publicly announced a proposal to engage in any transaction described
in clauses (i), (ii) or (iii) of this sentence or (b) the Board of Directors of
Landmark has withdrawn or modified its recommendation that the stockholders of
Landmark approve the Merger.  As used herein, the term Repurchase Event will be
deemed to mean any event specified in clauses (ii), (iii) or (iv) of the
immediately preceding sentence.  As used herein, the term Applicable Price will
be deemed to mean the highest of (i) the highest price per share at which a
tender or exchange offer has been made for shares of Landmark Common Stock prior
to the date (the "Request Date") at which Halliburton exercises its right to
require that Landmark repurchase the Option and the Option Shares, (ii) the
price per share to be paid by any third party for shares of Landmark Common
Stock pursuant to any merger or other business combination transaction entered
into by Landmark prior to the Request Date or (iii) the highest closing sales
price per share of Landmark Common Stock quoted on the National Market System
(the "National Market System") of the National Association of Securities
Dealers, Inc. during the 60 business days preceding the Request Date.

     The Stock Option Agreement also grants (i) Halliburton the right to require
that Landmark register (under the Securities Act) the re-offer and sale of the
Option Shares by Halliburton, (ii) Landmark a "right of first refusal" with
respect to certain sales by Halliburton of the Option Shares, and (iii) Landmark
the right to require Halliburton to sell to Landmark (subject to Halliburton's
right to complete a sale of the Option and/or the Option Shares to a third party
in compliance with Landmark's right of first refusal with respect to any such
sale) any Option Shares acquired by Halliburton and held by Halliburton at such
time.  The price per share at which Landmark has the right to repurchase Option
Shares from Halliburton is equal to the greater of (i) the Exercise Price or
(ii) the average closing price of the Landmark Common Stock on the National
Market System during the 10 business days immediately preceding the exercise of
such right by Landmark.

     Pursuant to a Voting Agreement (herein so called) by and among Mr. S. Rutt
Bridges, Ms. Barbara Ann Bridges and Halliburton, Mr. Bridges and Ms. Bridges
have agreed to (i) vote the 1,971,263  shares (the "Bridges Shares") of Landmark
Common Stock owned by them in favor of the approval of the Merger, (ii) vote
against approval of any competing proposal to acquire Landmark or its assets,
(iii) refrain from selling, pledging, assigning or otherwise transferring any of
the Bridges Shares to any person or entity which is not a party to the Voting
Agreement, (iv) refrain from granting any person or entity other than
Halliburton a proxy with respect to the Bridges Shares and (v) revoke any prior
proxy granted with respect to the Bridges Shares.

     The foregoing description of the Merger Agreement, Stock Option Agreement
and Voting Agreement does not purport to be complete and is qualified in its
entirety by reference to the copies of such agreements which are attached hereto
as exhibits.

     To facilitate the consummation of the Merger, the Board of Directors of
Landmark has amended that certain Rights Agreement, dated September 1, 1995, by
and between Landmark and Chemical Bank, as agent, to exempt the Merger from the
provisions of the Rights Agreement.

                                      -4-
<PAGE>
 
     Landmark, Halliburton and Electronic Data Systems Corporation have
announced their intention to form an alliance to develop a worldwide distributed
data management capability that integrates all information associated with the
oil field lifecycle.

ITEM 7.  FINANCIAL STATEMENT, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS.

     (a) FINANCIAL STATEMENTS OF BUSINESS ACQUIRED.

            None

     (b) PRO FORMA FINANCIAL INFORMATION.
 
            None 

     (c)  EXHIBITS.
 
            EXHIBIT 2.1   Agreement and Plan of Merger, dated June 30, 1996, by
            -----------
                          and among, Landmark Graphics Corporation, Halliburton
                          Company and Halliburton Acq. Company.
 
            EXHIBIT 99.1  Stock Option Agreement, dated June 30, 1996, by and 
            ------------
                          among Landmark Graphics Corporation and Halliburton
                          Company.
 
            EXHIBIT 99.2  Voting Agreement, dated June 30, 1996, by and among 
            ------------
                          Halliburton Company, S. Rutt Bridges and Barbara Ann
                          Bridges.
 
            EXHIBIT 99.3  First Amendment to Rights Agreement, dated June 30, 
            ------------
                          1996, by and between Landmark Graphics Corporation and
                          Chemical Bank.

                  SAFE HARBOR FOR FORWARD LOOKING STATEMENTS

     Certain of the information contained herein may be deemed to be forward
looking statements within the meaning of The Private Securities Litigation
Reform Act of 1995, including, without limitation, any implied representation
that the Merger will be consummated or that the strategic alliance (the
"Strategic Alliance") among Halliburton, Landmark and Electronic Data Systems
Corporation will be formed and any estimate of the date on which the Merger will
be consummated.  Such statements are qualified by the following disclaimers:

     Consummation of the Merger is subject to a number of conditions precedent,
including, without limitation, receipt of the requisite approval of the
stockholders of Landmark, no governmental action which would make the
consummation of the Merger illegal, the Merger qualifying for treatment as a
"pooling of interests" for financial accounting purposes, the continued accuracy
of each party's respective representations and warranties, the performance by
each party of its respective covenants, the listing of the shares of Halliburton
Common Stock to be issued in the Merger on the New York Stock Exchange and the
receipt of various opinions from the parties' financial and legal advisors.  Not
all of such conditions are within the control of Landmark.  Accordingly, there
can be no assurance that such conditions will be satisfied or waived or that the
Merger will be consummated.

     Negotiations relating to the formation of the Strategic Alliance have not
yet been completed.  Accordingly, no assurance can be given that the Strategic
Alliance will be formed or that, if formed, the Strategic Alliance will be
successful.

                                      -5-
<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 hereunto duly authorized.

                                          LANDMARK GRAPHICS CORPORATION


                                          By: /s/ William H. Seippel
                                             ---------------------------------
                                          Name: William H. Seippel
                                               -------------------------------

                                          Title: Vice President, Finance and
                                                 Chief Financial Officer
                                                 (Principal Financial and
                                                 Accounting Officer)
                                                ------------------------------

                                      -6-

<PAGE>
 
                                                                    Exhibit 2.1


                         AGREEMENT AND PLAN OF MERGER


                                 BY AND AMONG


                             HALLIBURTON COMPANY,


                           HALLIBURTON ACQ. COMPANY


                                      AND


                         LANDMARK GRAPHICS CORPORATION
<PAGE>
 
                               TABLE OF CONTENTS
                                                                            
<TABLE> 
<CAPTION> 
                                                                            Page
                                                                            ----
                            ARTICLE I  DEFINITIONS
<S>                                                                         <C>
 SECTION 1.1    Definitions..................................................  1
                -----------
 SECTION 1.2    Rules of Construction........................................  2
                ---------------------

                          ARTICLE II  TERMS OF MERGER

 SECTION 2.1    Statutory Merger.............................................  2
                ----------------
 SECTION 2.2    Effective Time...............................................  2
                --------------
 SECTION 2.3    Effect of the Merger.........................................  2
                --------------------
 SECTION 2.4    Certificate of Incorporation; Bylaws.........................  2
                ------------------------------------
 SECTION 2.5    Directors and Officers.......................................  3
                ----------------------

        ARTICLE III  CONVERSION OF SECURITIES; EXCHANGE OF CERTIFICATES

 SECTION 3.1    Merger Consideration; Conversion and Cancellation of
                ----------------------------------------------------
                Securities...................................................  3
                ----------
 SECTION 3.2    Exchange of Certificates.....................................  4
                -----------------------
 SECTION 3.3    Closing......................................................  6
                -------
 SECTION 3.4    Stock Transfer Books.........................................  6
                --------------------

           ARTICLE IV  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

 SECTION 4.1    Organization and Qualification; Subsidiaries.................  7
                --------------------------------------------
 SECTION 4.2    Certificate of Incorporation and Bylaws......................  7
                ---------------------------------------
 SECTION 4.3    Capitalization...............................................  7
                --------------
 SECTION 4.4    Authorization of Agreement...................................  9
                --------------------------
 SECTION 4.5    Approvals....................................................  9
                ---------
 SECTION 4.6    No Violation................................................. 10
                ------------
 SECTION 4.7    Reports...................................................... 10
                -------
 SECTION 4.8    No Material Adverse Effect; Conduct.......................... 11
                -----------------------------------
 SECTION 4.9    Title to Properties.......................................... 11
                -------------------
 SECTION 4.10   Certain Obligations.......................................... 12
                -------------------
 SECTION 4.11   Permits; Compliance.......................................... 12
                -------------------
 SECTION 4.12   Litigation; Compliance with Laws............................. 12
                --------------------------------
 SECTION 4.13   Employee Benefit Plans....................................... 13
                ----------------------
 SECTION 4.14   Taxes........................................................ 15
                -----
 SECTION 4.15   Environmental Matters........................................ 16
                ---------------------
 SECTION 4.16   Intellectual Property........................................ 17
                ---------------------
 SECTION 4.17   Insurance.................................................... 17
                ---------
</TABLE> 

                         Agreement and Plan of Merger

                                     -ii-
<PAGE>
 
<TABLE> 
 <S>                                                                          <C>  
 SECTION 4.18   Pooling; Tax Matters........................................  17
                --------------------
 SECTION 4.19   Affiliates..................................................  18
                ----------
 SECTION 4.20   Certain Business Practices..................................  18
                --------------------------
 SECTION 4.21   Opinion of Financial Advisor................................  19
                ----------------------------
 SECTION 4.22   Brokers.....................................................  19
                -------
 SECTION 4.23   Acquiring Person............................................  19
                ----------------

             ARTICLE V  REPRESENTATIONS AND WARRANTIES OF ACQUIROR

 SECTION 5.1    Organization and Qualification; Subsidiaries................  19
                --------------------------------------------
 SECTION 5.2    Certificate of Incorporation and Bylaws.....................  20
                ---------------------------------------
 SECTION 5.3    Capitalization..............................................  20
                --------------
 SECTION 5.4    Authorization of Agreement..................................  21
                --------------------------
 SECTION 5.5    Approvals...................................................  21
                ---------
 SECTION 5.6    No Violation................................................  22
                ------------
 SECTION 5.7    Reports.....................................................  22
                -------
 SECTION 5.8    No Material Adverse Effect; Conduct.........................  23
                -----------------------------------
 SECTION 5.9    Title to Properties.........................................  23
                -------------------
 SECTION 5.10   Certain Obligations.........................................  24
                -------------------
 SECTION 5.11   Permits; Compliance.........................................  24
                -------------------
 SECTION 5.12   Litigation; Compliance with Laws............................  24
                --------------------------------
 SECTION 5.13   Employee Benefit Plans......................................  25
                ----------------------
 SECTION 5.14   Taxes.......................................................  26
                -----
 SECTION 5.15   Environmental Matters.......................................  26
                ---------------------
 SECTION 5.16   Pooling; Tax Matters........................................  26
                --------------------
 SECTION 5.17   Affiliates..................................................  27
                ----------
 SECTION 5.18   Brokers.....................................................  27
                -------
 SECTION 5.19   Acquiring Person............................................  27
                ----------------
 SECTION 5.20   Proposal to Acquire the Acquiror............................  28
                --------------------------------
 SECTION 5.21   Certain Business Practices..................................  28
                --------------------------

                             ARTICLE VI  COVENANTS

 SECTION 6.1    Affirmative Covenants.......................................  28
                ---------------------
 SECTION 6.2    Negative Covenants..........................................  29
                ------------------
 SECTION 6.3    No Solicitation.............................................  34
                ---------------
 SECTION 6.4    Access and Information......................................  35
                ----------------------
 SECTION 6.5    Confidentiality Agreement...................................  35
                -------------------------

                      ARTICLE VII  ADDITIONAL AGREEMENTS

 SECTION 7.1    Meeting of Stockholders.....................................  35
                -----------------------
 SECTION 7.2    Registration Statement; Proxy Statements....................  36
                ----------------------------------------
</TABLE>

                         Agreement and Plan of Merger

                                     -iii-
<PAGE>
 
<TABLE>
 <S>            <C>                                                           <C>
 SECTION 7.3    Appropriate Action; Consents; Filings.......................  38
                -------------------------------------
 SECTION 7.4    Affiliates; Pooling; Tax Treatment..........................  39
                ----------------------------------
 SECTION 7.5    Public Announcements........................................  40
                --------------------
 SECTION 7.6    NYSE Listing................................................  40
                ------------
 SECTION 7.7    Rights Agreement; State Takeover Statutes...................  40
                -----------------------------------------
 SECTION 7.8    Comfort Letters.............................................  40
                ---------------
 SECTION 7.9    Assumption of Obligations to Issue Stock....................  41
                ----------------------------------------
 SECTION 7.10   Employee Benefit Plans......................................  42
                ----------------------
 SECTION 7.11   Indemnification of Directors and Officers...................  43
                -----------------------------------------
 SECTION 7.12   Newco.......................................................  44
                -----
 SECTION 7.13   Event Notices...............................................  44
                -------------
 SECTION 7.14   Stratworks Divestiture......................................  44
                ----------------------
 SECTION 7.15   Change in Control Agreements................................  44
                ----------------------------

                        ARTICLE VIII  CLOSING CONDITIONS

 SECTION 8.1    Conditions to Obligations of Each Party Under This
                --------------------------------------------------
                Agreement...................................................  45
                ---------
 SECTION 8.2    Additional Conditions to Obligations of the Acquiror Com-
                ---------------------------------------------------------
                panies......................................................  46
                ------
 SECTION 8.3    Additional Conditions to Obligations of the Company.........  46
                ---------------------------------------------------

                 ARTICLE IX  TERMINATION, AMENDMENT AND WAIVER

 SECTION 9.1    Termination.................................................  47
                -----------
 SECTION 9.2    Effect of Termination.......................................  49
                ---------------------
 SECTION 9.3    Amendment...................................................  49
                ---------
 SECTION 9.4    Waiver......................................................  49
                ------
 SECTION 9.5    Fees, Expenses and Other Payments...........................  49
                ---------------------------------

                         ARTICLE X  GENERAL PROVISIONS

 SECTION 10.1   Effectiveness of Representations, Warranties and
                ------------------------------------------------
                Agreements..................................................  51
                ----------
 SECTION 10.2   Notices.....................................................  51
                -------
 SECTION 10.3   Headings....................................................  52
                --------
 SECTION 10.4   Severability................................................  52
                ------------
 SECTION 10.5   Entire Agreement............................................  53
                ----------------
 SECTION 10.6   Assignment..................................................  53
                ----------
 SECTION 10.7   Parties in Interest.........................................  53
                -------------------
 SECTION 10.8   Failure or Indulgence Not Waiver;  Remedies Cumulative......  53
                ------------------------------------------------------
 SECTION 10.9   Governing Law...............................................  53
                -------------
 SECTION 10.10  Counterparts................................................  53
                -------------
</TABLE>

                         Agreement and Plan of Merger

                                     -iv-
<PAGE>
 
                                    ANNEXES
                                    -------


Annex A   Schedule of Defined Terms
Annex B   Affiliate's Agreement (Landmark Graphics Corporation Affiliates)
Annex C   Affiliate's Agreement (Halliburton Company Affiliates)

                         Agreement and Plan of Merger

                                      -v-
<PAGE>
 
                         AGREEMENT AND PLAN OF MERGER


     THIS AGREEMENT AND PLAN OF MERGER, dated as of June 30, 1996 (this
"Agreement"), is by and among Halliburton Company, a Delaware corporation
("Acquiror"), Halliburton Acq. Company, a Delaware corporation and a wholly-
owned subsidiary of Acquiror ("Newco"), and Landmark Graphics Corporation, a
Delaware corporation (the "Company").  The Acquiror and Newco are sometimes
referred to herein as the "Acquiror Companies."

                                   RECITALS:
                                        
     The Board of Directors of the Company has determined that the business
combination to be effected by means of the Merger is consistent with and in
furtherance of the long-term business strategy of the Company and is fair to,
and in the best interests of, the Company and its stockholders and has approved
and adopted this Agreement and recommended approval and adoption of this
Agreement by the stockholders of the Company.

     The Board of Directors of the Acquiror has determined that the business
combination to be effected by means of the Merger is consistent with and in
furtherance of the long-term business strategy of the Acquiror and is fair to,
and in the best interests of, the Acquiror and its stockholders and has approved
and adopted this Agreement.

     Upon the terms and subject to the conditions of this Agreement and in
accordance with the GCL, the Company will merge with and into Newco and Newco
will be the Surviving Corporation.

     For federal income tax purposes, it is intended that the Merger will
qualify as a reorganization within the meaning of the provisions of Section
368(a) of the Code.

     The Merger is intended to be treated as a "pooling of interests" for
accounting purposes.

     The parties hereto acknowledge the execution and delivery of the Stock
Option Agreement and the Voting Agreement concurrently with the execution and
delivery of this Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants and agreements set forth in this
Agreement, the parties hereto agree as follows:

                                   ARTICLE I

                                  DEFINITIONS

     SECTION 1.1    Definitions.  Certain capitalized and other terms used in
                    -----------                                              
this Agreement are defined in Annex A hereto and are used herein with the
meanings ascribed to them therein.
<PAGE>
 
     SECTION 1.2    Rules of Construction.  Unless the context otherwise
                    ---------------------                               
requires, as used in this Agreement:  (a) a term has the meaning ascribed to it;
(b) an accounting term not otherwise defined has the meaning ascribed to it in
accordance with generally accepted accounting principles as in effect from time
to time:  (c) "or" is not exclusive; (d) "including" means "including, without
limitation;" and (e) words in the singular include the plural and words in the
plural include the singular.

                                   ARTICLE II

                                TERMS OF MERGER

     SECTION 2.1    Statutory Merger.  Subject to the terms and conditions and
                    ----------------                                          
in reliance upon the representations, warranties, covenants and agreements
contained herein, the Company shall merge with and into Newco at the Effective
Time.  The terms and conditions of the Merger and the mode of carrying the same
into effect shall be as set forth in this Agreement.  As a result of the Merger,
the separate corporate existence of each of the Constituent Corporations shall
cease and Newco shall continue as the Surviving Corporation.

     SECTION 2.2    Effective Time.  As soon as practicable after the
                    --------------                                   
satisfaction or, if permissible, waiver of the conditions set forth in Article
VIII, the parties hereto shall cause the Merger to be consummated by filing a
Certificate of Merger with the Secretary of State of the State of Delaware, in
such form as required by, and executed in accordance with the relevant
provisions of, the GCL.

     SECTION 2.3    Effect of the Merger.  At the Effective Time, the effect of
                    --------------------                                       
the Merger shall be as provided in the applicable provisions of the GCL. Without
limiting the generality of the foregoing, and subject thereto, at the Effective
Time, except as otherwise provided herein, all the property, rights, privileges,
powers and franchises of Newco and the Company shall vest in the Surviving
Corporation, and all debts, liabilities and duties of Newco and the Company
shall become the debts, liabilities and duties of the Surviving Corporation.

     SECTION 2.4    Certificate of Incorporation; Bylaws.  At the Effective
                    ------------------------------------                   
Time, the certificate of incorporation and the bylaws of Newco, as in effect
immediately prior to the Effective Time, shall be the certificate of
incorporation and the bylaws of the Surviving Corporation, except that from and
after the Effective Time Article I of the certificate of incorporation shall be
and read in its entirety as follows:

                                   ARTICLE I

     The name of the corporation shall be "Landmark Graphics Corporation."

Prior to the Effective Time, the certificate of incorporation and bylaws of
Newco shall be amended so as to contain provisions substantially similar in form
and substance to the provisions

                         Agreement and Plan of Merger

                                      -2-
<PAGE>
 
contained in Article IX of the certificate of incorporation and Section 6.10 of
the bylaws of the Company, respectively.

     SECTION 2.5    Directors and Officers.  The directors of Newco immediately
                    ----------------------                                     
prior to the Effective Time shall be the directors of the Surviving Corporation,
each to hold office in accordance with the certificate of incorporation and
bylaws of the Surviving Corporation, and the officers of the Company immediately
prior to the Effective Time shall be the officers of the Surviving Corporation,
in each case until their respective successors are duly elected or appointed and
qualified.

                                  ARTICLE III

               CONVERSION OF SECURITIES; EXCHANGE OF CERTIFICATES

     SECTION 3.1    Merger Consideration; Conversion and Cancellation of
                    ----------------------------------------------------
Securities.  At the Effective Time, by virtue of the Merger and without any
- ----------                                                                 
action on the part of the Acquiror Companies, the Company or the holders of any
of the following securities:

          (a)  Subject to the other provisions of this Article III, each share
     of Company Common Stock issued and outstanding immediately prior to the
     Effective Time (excluding any Company Common Stock described in Section
     3.01(c)) shall be converted into 0.574 shares of Acquiror Common Stock.
     Notwithstanding the foregoing, if between the date of this Agreement and
     the Effective Time the outstanding shares of the Acquiror Common Stock or
     the Company Common Stock shall have been changed into a different number of
     shares or a different class, by reason of any stock dividend, subdivision,
     reclassification, recapitalization, split, combination or exchange of
     shares, the Common Stock Exchange Ratio shall be correspondingly adjusted
     to reflect such stock dividend, subdivision, reclassification,
     recapitalization, split, combination or exchange of shares.

          (b)  All shares of Company Common Stock shall, upon conversion thereof
     into shares of Acquiror Common Stock at the Effective Time, cease to be
     outstanding and shall automatically be cancelled and retired, and each
     certificate previously evidencing Company Common Stock outstanding
     immediately prior to the Effective Time (other than Company Common Stock
     described in Section 3.01(c)) shall thereafter be deemed, for all purposes
     other than the payment of dividends or distributions, to represent that
     number of shares of Acquiror Common Stock determined pursuant to the Common
     Stock Exchange Ratio and, if applicable, the right to receive cash pursuant
     to Section 3.02(e). The holders of certificates previously evidencing
     Company Common Stock shall cease to have any rights with respect to such
     Company Common Stock except as otherwise provided herein or by law.

          (c) Notwithstanding any provision of this Agreement to the contrary,
     each share of Company Common Stock held in the treasury of the Company and
     each share of Company Common Stock, if any, owned by the Acquiror or any
     direct or indirect

                         Agreement and Plan of Merger

                                      -3-
<PAGE>
 
     wholly-owned Subsidiary of the Acquiror or of the Company immediately prior
     to the Effective Time shall be cancelled and extinguished without
     conversion thereof.

          (d)  Each share of common stock, par value $1.00 per share, of Newco
     issued and outstanding immediately prior to the Effective Time shall
     continue to be issued and outstanding as one share of common stock, par
     value $1.00 per share, of the Surviving Corporation.

     SECTION 3.2    Exchange of Certificates.
                    ------------------------ 

          (a)  Exchange Fund.  On the day of  the Effective Time, the Acquiror
               -------------                                                  
     shall deposit, or cause to be deposited, with the Exchange Agent, for the
     benefit of the former holders of Company Common Stock, for exchange in
     accordance with this Article III, through the Exchange Agent, certificates
     evidencing a number of shares of Acquiror Common Stock equal to the product
     of the Common Stock Exchange Ratio multiplied by the number of shares of
     Company Common Stock issued and outstanding immediately prior to the
     Effective Time (exclusive of any such shares to be cancelled pursuant to
     Section 3.01(c)).  The Exchange Agent shall, pursuant to irrevocable
     instructions from the Acquiror, deliver Acquiror Common Stock, together
     with any cash to be paid in lieu of fractional interests in shares of
     Acquiror Common Stock pursuant to Section 3.02(e) and any dividends or
     distributions related thereto, in exchange for certificates theretofore
     evidencing Company Common Stock surrendered to the Exchange Agent  pursuant
     to Section 3.02(c).  Except as contemplated by Section 3.02(e), the
     Exchange Fund shall not be used for any other purpose.

          (b)  Letter of Transmittal.  Promptly after the Effective Time, the
               ---------------------                                         
     Acquiror will cause the Exchange Agent to send to each record holder of
     Company Common Stock immediately prior to the Effective Time a letter of
     transmittal and other appropriate materials for use in surrendering to the
     Exchange Agent certificates that prior to the Effective Time evidenced
     shares of Company Common Stock.

          (c)  Exchange Procedures.  Promptly after the Effective Time, the
               -------------------                                         
     Exchange Agent shall distribute to each former holder of Company Common
     Stock, upon surrender to the Exchange Agent for cancellation of one or more
     certificates that theretofore evidenced shares of Company Common Stock,
     certificates evidencing the appropriate number of shares of Acquiror Common
     Stock into which such shares of Company Common Stock were converted
     pursuant to the Merger, together with any cash to be paid in lieu of
     fractional interests in shares of Acquiror Common Stock pursuant to Section
     3.02(e) and any dividends or distributions related thereto. If shares of
     Acquiror Common Stock are to be issued to a Person other than the Person in
     whose name the surrendered certificate or certificates are registered, it
     shall be a condition of issuance of the Acquiror Common Stock that the
     surrendered certificate or certificates shall be properly endorsed, with
     signatures guaranteed, or otherwise in proper form for transfer and that
     the Person requesting such payment shall pay any transfer or other taxes
     required

                         Agreement and Plan of Merger

                                      -4-
<PAGE>
 
     by reason of the issuance of Acquiror Common Stock to a Person other than
     the registered holder of the surrendered certificate or certificates or
     such Person shall establish to the satisfaction of the Acquiror that such
     tax has been paid or is not applicable.  Notwithstanding the foregoing,
     neither the Exchange Agent nor any party hereto shall be liable to any
     former holder of Company Common Stock for any Acquiror Common Stock, cash
     in lieu of fractional share interests or dividends or distributions thereon
     delivered to a public official pursuant to any applicable escheat law.

          (d)  Distributions with Respect to Unexchanged Shares of Company 
               -----------------------------------------------------------
     Common Stock.  No dividends or other distributions declared or made with 
     ------------    
     respect to Acquiror Common Stock with a record date after the Effective
     Time shall be paid to the holder of any certificate that theretofore
     evidenced shares of Company Common Stock until the holder of such
     certificate shall surrender such certificate. Subject to the effect of any
     applicable escheat laws, following surrender of any such certificate, there
     shall be paid (i) to the holder of the certificates evidencing whole shares
     of Acquiror Common Stock issued in exchange therefor, without interest, (A)
     promptly, the amount of dividends or other distributions with a record date
     after the Effective Time theretofore paid with respect to such whole shares
     of Acquiror Common Stock, and (B) at the appropriate payment date, the
     amount of dividends or other distributions, with a record date after the
     Effective Time but prior to surrender and a payment date occurring after
     surrender, payable with respect to such whole shares of Acquiror Common
     Stock and (ii) to the holder of any certificate that theretofore evidenced
     shares of Company Common Stock, without interest, promptly the amount of
     any cash payable with respect to a fractional share of Acquiror Common
     Stock to which such holder is entitled pursuant to Section 3.02(e).

          (e)  No Fractional Shares.  Notwithstanding anything herein to the
               --------------------                                         
     contrary, no certificates or scrip evidencing fractional shares of Acquiror
     Common Stock shall be issued in connection with the Merger, and any such
     fractional share interests to which a holder of record of Company Common
     Stock at the Effective Time would otherwise be entitled will not entitle
     such holder to vote or to any rights of a stockholder of the Acquiror.  In
     lieu of any such fractional shares, each holder of record of Company Common
     Stock at the Effective Time who but for the provisions of this Section
     3.02(e) would be entitled to receive a fractional interest of a share of
     Acquiror Common Stock pursuant to the Merger shall be paid cash, without
     any interest thereon, as hereinafter provided.  The Acquiror shall instruct
     the Exchange Agent to determine the number of whole shares and fractional
     shares of Acquiror Common Stock allocable to each holder of record of
     Company Common Stock at the Effective Time, to aggregate all such
     fractional shares into whole shares, to sell the whole shares obtained
     thereby in the open market at then prevailing prices on behalf of holders
     who otherwise would be entitled to receive fractional share interests and
     to distribute to each such holder such holder's ratable share of the total
     proceeds of such sale, after making appropriate deductions of the amount,
     if any,  required for Federal income tax withholding purposes and after

                         Agreement and Plan of Merger

                                      -5-
<PAGE>
 
     deducting any applicable transfer taxes.  All brokers' fees and commissions
     and fees of the Exchange Agent incurred in connection with such sales shall
     be paid by the Acquiror.

          (f)  Termination of Exchange Fund.  Any portion of the Exchange Fund
               ----------------------------                                   
     which remains unclaimed by the former holders of Company Common Stock for
     twelve months after the Effective Time shall be delivered to the Acquiror,
     upon demand, and any former holders of Company Common Stock who have not
     theretofore complied with this Article III shall thereafter look only to
     the Acquiror for the Acquiror Common Stock and any cash to which they are
     entitled.

          (g)  Withholding of Tax.  The Acquiror shall be entitled to deduct and
               ------------------                                               
     withhold from the consideration otherwise payable pursuant to this
     Agreement to any former holder of Company Common Stock such amounts as the
     Acquiror (or any affiliate thereof) is required to deduct and withhold with
     respect to the making of such payment under the Code, or any provision of
     state, local or foreign tax law.  To the extent that amounts are so
     withheld by the Acquiror, such withheld amounts shall be treated for all
     purposes of this Agreement as having been paid to the former holder of
     Company Common Stock in respect of which such deduction and withholding was
     made by the Acquiror.

          (h)  Lost Certificates.  If any certificate evidencing Company Common
               -----------------                                               
     Stock shall have been lost, stolen or destroyed, upon the making of an
     affidavit of that fact by the Person claiming such certificate to be lost,
     stolen or destroyed and, if required by the Acquiror, the posting by such
     Person of a bond, in such reasonable amount as the Acquiror may direct, as
     indemnity against claims that may be made against it with respect to such
     certificate, the Exchange Agent will issue in exchange for such lost,
     stolen or destroyed certificate the Acquiror Common Stock to which the
     holder may be entitled pursuant to this Article III, any cash in lieu of
     fractional shares of Acquiror Common Stock to which the holder thereof may
     be entitled pursuant to Section 3.02(e) and any dividends or other
     distributions to which the holder thereof may be entitled pursuant to
     Section 3.02(d).

     SECTION 3.3    Closing.  The Closing shall take place at the offices of
                    -------                                                 
Vinson & Elkins L.L.P., 1001 Fannin, 3600 First City Tower, Houston, Texas
77002-6760, at 10:00 a.m. on the second Business Day following the date on which
the conditions to the Closing have been satisfied or waived or at such other
place, time and date as the parties hereto may agree.  At the conclusion of the
Closing on the Closing Date, the parties hereto shall cause the Certificate of
Merger to be filed with the Secretary of State of the State of Delaware.

     SECTION 3.4    Stock Transfer Books.  At the Effective Time, the stock
                    --------------------                                   
transfer books of the Company shall be closed and there shall be no further
registration of transfers of shares of Company Common Stock thereafter on the
records of the Company.

                         Agreement and Plan of Merger

                                      -6-
<PAGE>
 
                                  ARTICLE IV

                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY

     The Company hereby represents and warrants to the Acquiror Companies that:

     SECTION 4.1    Organization and Qualification; Subsidiaries.  The
                    --------------------------------------------      
Company and each Subsidiary of the Company are legal entities duly organized,
validly existing and in good standing under the Laws of their respective
jurisdictions of incorporation or organization, have all requisite power and
authority to own, lease and operate their respective properties and to carry on
their business as it is now being conducted and are duly qualified and in good
standing to do business in each jurisdiction in which the nature of the business
conducted by them or the ownership or leasing of their respective properties
makes such qualification necessary, other than any matters, including  the
failure to be so duly qualified and in good standing, that could not reasonably
be expected to have a Material Adverse Effect on the Company. Section 4.01 of
the Company's Disclosure Letter sets forth, as of the date of this Agreement, a
true and complete list of all the Company's directly or indirectly owned
Subsidiaries, together with (A) the jurisdiction of incorporation of each
Subsidiary and the percentage of each Subsidiary's outstanding capital stock or
other equity interests owned by the Company or another Subsidiary of the
Company, and (B) an indication of whether each such Subsidiary is a "Significant
Subsidiary."  Neither the Company nor any of its Subsidiaries owns an equity
interest in any partnership or joint venture arrangement or other business
entity that is Material to the Company.

     SECTION 4.2    Certificate of Incorporation and Bylaws.  The Company has
                    ---------------------------------------                  
heretofore marked for identification and furnished to the Acquiror complete and
correct copies of the certificate of incorporation and the bylaws or the
equivalent organizational documents, in each case as amended or restated to the
date hereof, of the Company and each of its Subsidiaries. Neither the Company
nor any of its Subsidiaries is in violation of any of the provisions of its
certificate of incorporation or bylaws (or equivalent organizational documents).

     SECTION 4.3    Capitalization.
                    -------------- 

          (a) The authorized capital stock of the Company consists of (i)
     50,000,000 shares of Company Common Stock of which, as of March 29, 1996,
     17,498,396 shares were issued and outstanding, all of which are duly
     authorized, validly issued, fully paid and nonassessable and not subject to
     preemptive rights created by statute, the Company's certificate of
     incorporation or bylaws or any agreement to which the Company is a party or
     is bound and (ii) 3,600,000 shares of Preferred Stock, par value $1.00 per
     share, of which none is issued but of which 500,000 shares have been
     designated as Series A Junior Participating Preferred Stock.  As of June
     30, 1996, 3,100,727 shares of Company Common Stock were reserved for future
     issuance pursuant to outstanding Company Stock Options granted pursuant to
     the Company Option Plans.  Except as set forth in Section 4.03(a) of the
     Company's Disclosure Letter, between March 29, 1996 and the date of this
     Agreement, no shares of Company Common Stock

                         Agreement and Plan of Merger

                                      -7-
<PAGE>
 
     have been issued by the Company.  Except as set forth in Section 4.03(a) of
     the Company's Disclosure Letter, since March 29, 1996, the Company has not
     granted any options for, or other rights to purchase, shares of Company
     Common Stock.

          (b)  Except as set forth in Section 4.03(a), no shares of Common Stock
     are reserved for issuance, and, except for the Company's Rights Plan and
     Company Stock Options listed in Section 4.03(b) of the Company's Disclosure
     Letter, there are no contracts, agreements, commitments or arrangements
     obligating the Company (i) to offer, sell, issue or grant any shares of, or
     any options, warrants or rights of any kind to acquire any shares of, or
     any securities that are convertible into or exchangeable for any shares of,
     capital stock of the Company, (ii) to redeem, purchase or acquire, or offer
     to purchase or acquire, any outstanding shares of, or any outstanding
     options, warrants or rights of any kind to acquire any shares of, or any
     outstanding securities that are convertible into or exchangeable for any
     shares of, capital stock of the Company or (iii) to grant any Lien on any
     shares of capital stock of the Company.

          (c)  The authorized, issued and outstanding capital stock of, or other
     equity interests in, each of the Company's Subsidiaries and the names and
     addresses of the holders of record of the capital stock or other equity
     interests of each such Subsidiary are set forth in Section 4.03(c) of the
     Company's Disclosure Letter.  Except as set forth in the Company's
     Disclosure Letter, (i) the issued and outstanding shares of capital stock
     of, or other equity interests in, each of the Subsidiaries of the Company
     that are owned by the Company or any of its Subsidiaries have been duly
     authorized and are validly issued, and, with respect to capital stock, are
     fully paid and nonassessable, and were not issued in violation of any
     preemptive or similar rights of any past or present equity holder of such
     Subsidiary; (ii) all such issued and outstanding shares, or other equity
     interests, that are indicated as owned by the Company or one of its
     Subsidiaries in Section 4.03(c) of the Company's Disclosure Letter are
     owned (A) beneficially as set forth therein and (B) free and clear of all
     Liens;  (iii) no shares of capital stock of, or other equity interests in,
     any Subsidiary of the Company are reserved for issuance, and there are no
     contracts, agreements, commitments or arrangements obligating the Company
     or any of its Subsidiaries (A) to offer, sell, issue, grant, pledge,
     dispose of or encumber any shares of capital stock of, or other equity
     interests in, or any options, warrants or rights of any kind to acquire any
     shares of capital stock of, or other equity interests in, or any securities
     that are convertible into or exchangeable for any shares of capital stock
     of, or other equity interests in, any of the Subsidiaries of the Company or
     (B) to redeem, purchase or acquire, or offer to purchase or acquire, any
     outstanding shares of capital stock of, or other equity interests in, or
     any outstanding options, warrants or rights of any kind to acquire any
     shares of capital stock of or other equity interest in, or any outstanding
     securities that are convertible into or exchangeable for, any shares of
     capital stock of, or other equity interests in, any of the Subsidiaries of
     the Company or (C) to grant any Lien on any outstanding shares of capital
     stock of, or other equity interest in, any of the Subsidiaries of the
     Company; except for any matter under clause (i), (ii) or (iii) of this

                         Agreement and Plan of Merger

                                      -8-
<PAGE>
 
     Section 4.03(c) that could not reasonably be expected to have a Material
     Adverse Effect on the Company.

          (d)  Except as set forth in Section 4.03(d) of the Company's
     Disclosure Letter and for the Company's Rights Agreement, the Company Stock
     Options listed in Section 4.03(b) of the Company's Disclosure Letter and
     the Stock Option Agreement, there are no voting trusts, proxies or other
     agreements, commitments or understandings of any character to which the
     Company or any of its Subsidiaries is a party or by which the Company or
     any of its Subsidiaries is bound with respect to the voting of any shares
     of capital stock of the Company or any of its Subsidiaries or with respect
     to the registration of the offering, sale or delivery of any shares of
     capital stock of the Company or any of its Subsidiaries under the
     Securities Act, except in the case of any Subsidiaries of the Company that
     are not Significant Subsidiaries for any matters that could not reasonably
     be expected to have a Material Adverse Effect on the Company.

     SECTION 4.4    Authorization of Agreement.  The Company has all requisite
                    --------------------------                                
corporate power and authority to execute and deliver this Agreement and each
instrument required hereby to be executed and delivered by it at the Closing, to
perform its obligations hereunder and thereunder and to consummate the
transactions contemplated hereby.  The execution and delivery by the Company of
this Agreement and each instrument required hereby to be executed and delivered
by it at the Closing and the performance of its obligations hereunder and
thereunder have been duly and validly authorized by all requisite corporate
action on the part of the Company (other than, with respect to the Merger, the
approval and adoption of this Agreement by the holders of a majority of the
outstanding shares of Company Common Stock in accordance with the GCL and the
Company's certificate of incorporation).  This Agreement has been duly executed
and delivered by the Company and (assuming due authorization, execution and
delivery hereof by the other parties hereto) constitutes a legal, valid and
binding obligation of the Company, enforceable against the Company in accordance
with its terms, except as the same may be limited by legal principles of general
applicability governing the application and availability of equitable remedies.

     SECTION 4.5    Approvals.  Except for the applicable requirements, if any,
                    ---------                                                  
of (a) the Securities Act, (b) the Exchange Act, (c) state securities or blue
sky laws, (d) the HSR Act, (e) the competition Laws, Regulations and Orders of
foreign Governmental Authorities as set forth in the Company's Disclosure
Letter, (f) the NASD, (g) the filing and recordation of appropriate merger
documents as required by the GCL and (h) those Laws, Regulations and Orders
noncompliance with which could not reasonably be expected to have a material
adverse effect on the ability of the Company to perform its obligations under
this Agreement or to have a Material Adverse Effect on the Company, no filing or
registration with, no waiting period imposed by and no Permit or Order of, any
Governmental Authority is required under any Law, Regulation or Order applicable
to the Company or any of its Subsidiaries to permit the Company to execute,
deliver or perform this Agreement or any instrument required hereby to be
executed and delivered by it at the Closing.

                         Agreement and Plan of Merger

                                      -9-
<PAGE>
 
     SECTION 4.6    No Violation.  Assuming effectuation of all filings and
                    ------------                                           
registrations with, termination or expiration of any applicable waiting periods
imposed by and receipt of all Permits and Orders of, Governmental Authorities
indicated as required in Section 4.05 and receipt of the approval of the Merger
by the stockholders of the Company as required by the GCL and except as set
forth in Section 4.06 of the Company's Disclosure Letter, neither the execution
and delivery by the Company of this Agreement or any instrument required hereby
to be executed and delivered by it at the Closing nor the performance by the
Company of its obligations hereunder or thereunder will (a) violate or breach
the terms of or cause a default under (i) any Law, Regulation or Order
applicable to the Company, (ii) the certificate of incorporation or bylaws of
the Company or (iii) any contract or agreement to which the Company or any of
its Subsidiaries is a party or by which it or any of its properties or assets is
bound, or (b) with the passage of time, the giving of notice or the taking of
any action by a third Person, have any of the effects set forth in clause (a) of
this Section, except in any such case for any matters described in this Section
that could not reasonably be expected to have a material adverse effect upon the
ability of the Company to perform its obligations under this Agreement or a
Material Adverse Effect on the Company.  Prior to the execution of this
Agreement, the Board of Directors of the Company has taken all necessary action
to cause this Agreement and the transactions contemplated hereby to be exempt
from the provisions of Section 203 of the GCL and to ensure that the execution,
delivery and performance of this Agreement by the parties hereto will not cause
any rights to be distributed or to become exercisable under the Company's Rights
Plan.

     SECTION 4.7    Reports.
                    ------- 

          (a)  Since June 30, 1993, the Company and its Subsidiaries have filed
     (i) all SEC Reports of the Company required to be filed with the Commission
     and (ii) all other Reports of the Company required to be filed with any
     other Governmental Authorities, including state securities administrators,
     except where the failure to file any such Reports of the Company could not
     reasonably be expected to have a Material Adverse Effect on the Company.
     The Reports of the Company, including all those filed after the date of
     this Agreement and prior to the Effective Time, (i) were prepared in all
     material respects in accordance with the requirements of applicable Law
     (including, with respect to the SEC Reports of the Company, the Securities
     Act and the Exchange Act, as the case may be, and the applicable
     Regulations of the Commission thereunder) and (ii), in the case of the SEC
     Reports of the Company, did not at the time they were filed contain any
     untrue statement of a material fact or omit to state a material fact
     required to be stated therein or necessary in order to make the statements
     therein, in the light of the circumstances under which they were made, not
     misleading.

          (b)  The Company Consolidated Financial Statements and any
     consolidated financial statements of the Company (including any related
     notes thereto) contained in any SEC Reports of the Company filed with the
     Commission after the date of this Agreement (i) have been or will have been
     prepared in accordance with the published Regulations of the Commission and
     in accordance with GAAP (except (A) to the extent required by

                         Agreement and Plan of Merger

                                      -10-
<PAGE>
 
     changes in GAAP and (B), with respect to SEC Reports of the Company filed
     prior to the date of this Agreement, as may be indicated in the notes
     thereto) and (ii) fairly present the consolidated financial position of the
     Company and its Subsidiaries as of the respective dates thereof and the
     consolidated results of their operations and cash flows for the periods
     indicated (including, in the case of any unaudited interim financial
     statements, reasonable estimates of normal and recurring year-end
     adjustments).

          (c)  Except as set forth in Section 4.07(c) of the Company's
     Disclosure Letter, there exist no liabilities or obligations of the Company
     and its Subsidiaries that are Material to the Company, whether accrued,
     absolute, contingent or threatened, which would be required to be
     reflected, reserved for or disclosed under GAAP in consolidated financial
     statements of the Company (including the notes thereto) as of and for the
     period ended on the date of this representation and warranty, other than
     (i) liabilities or obligations that are adequately reflected, reserved for
     or disclosed in the Company's Consolidated Financial Statements, (ii)
     liabilities or obligations incurred in the ordinary course of business of
     the Company since March 31, 1996, and (iii) liabilities or obligations the
     incurrence of which is not prohibited by Section 6.02(a).

     SECTION 4.8    No Material Adverse Effect; Conduct.
                    ----------------------------------- 

          (a)  Since March 31, 1996, no event  (other than any event that is
     directly attributable to the prospect of consummation of the Merger or is
     of general application to all or a substantial portion of the Company's
     industry and other than any event that is expressly subject to any other
     representation or warranty contained in Article IV) has, to the Knowledge
     of the Company, occurred that, individually or together with other similar
     events, could reasonably be expected to constitute or cause a Material
     Adverse Effect on the Company.

          (b)  Except as disclosed in Section 4.08(b) of the Company's
     Disclosure Letter, during the period from March 31, 1996 to the date of
     this Agreement, neither the Company nor any of its Subsidiaries has engaged
     in any conduct that is proscribed during the period from the date of this
     Agreement to the Effective Time by subsections (i) through (xi) of Section
     6.02(a) or agreed in writing or otherwise during such period prior to the
     date of this Agreement to engage in any such conduct.

     SECTION 4.9    Title to Properties.  The Company or its Subsidiaries,
                    -------------------                                   
individually or together, have indefeasible title to all of the properties
reflected in the Company's Consolidated Balance Sheet, other than any properties
reflected in the Company's Consolidated Balance Sheet that (i) have been sold or
otherwise disposed of since the date of the Company's Consolidated Balance Sheet
in the ordinary course of business consistent with past practice or (ii) are
not, individually or in the aggregate, Material to the Company, free and clear
of Liens, other than (x) Liens the existence of which is reflected in the
Company's Consolidated Financial Statements, (y) Permitted Encumbrances and (z)
Liens that, individually or in the aggregate, are not Material to the Company.
The Company or its Subsidiaries, individually or together, hold

                         Agreement and Plan of Merger

                                     -11-
<PAGE>
 
under valid lease agreements all real and personal properties reflected in the
Company's Consolidated Balance Sheet as being held under capitalized leases, and
all real and personal property that is subject to the operating leases to which
reference is made in the notes to the Company's Audited Consolidated Financial
Statements, and enjoy peaceful and undisturbed possession of such properties
under such leases, other than (i) any properties as to which such leases have
expired in accordance with their terms without any liability of any party
thereto since the date of the Company's Consolidated Balance Sheet and (ii) any
properties that, individually or in the aggregate, are not Material to the
Company.  Neither the Company nor any of its Subsidiaries has received any
written notice of any adverse claim to the title to any properties owned by them
or with respect to any lease under which any properties are held by them, other
than any claims that, individually or in the aggregate, could not reasonably be
expected to have a Material Adverse Effect on the Company.

     SECTION 4.10   Certain Obligations.  Section 4.10 of the Company's
                    -------------------                                
Disclosure Letter contains a true and complete list of the Material Contracts of
the Company and its Subsidiaries.  Except as set forth in Section 4.10 of the
Company's Disclosure Letter, neither the Company nor any of its Subsidiaries is
a party to or bound by any Material Contract.  All Material Contracts to which
the Company or any of its Subsidiaries is a party are in full force and effect,
the Company or the Subsidiary of the Company that is a party to or bound by such
Material Contract has performed its obligations thereunder to date and, to the
Knowledge of the Company, each other party thereto has performed its obligations
thereunder to date, other than any failure of a Material Contract to be in full
force and effect or any nonperformance thereof that could not reasonably be
expected to have a Material Adverse Effect on the Company.

     SECTION 4.11   Permits; Compliance.  To the Knowledge of the Company, the
                    -------------------                                       
Company and its Subsidiaries have obtained all Permits that are necessary to
carry on their businesses as currently conducted, except for any such Permits as
to which, individually or in the aggregate, the failure to possess could not
reasonably be expected to have a Material Adverse Effect on the Company.  Such
Permits are in full force and effect, have not been violated in any respect that
could reasonably be expected to have a Material Adverse Effect on the Company
and, to the Knowledge of the Company, no suspension, revocation or cancellation
thereof has been threatened and there is no action, proceeding or investigation
pending or threatened regarding suspension, revocation or cancellation of any of
such Permits, except where the suspension, revocation or cancellation of such
Permits could not reasonably be expected to have a Material Adverse Effect on
the Company.

     SECTION 4.12   Litigation; Compliance with Laws.  There are no actions,
                    --------------------------------                        
suits, investigations or proceedings (including any proceedings in arbitration)
pending or, to the Knowledge of the Company, threatened against the Company or
any of its Subsidiaries, at law or in equity, in any Court or before or by any
Governmental Authority, except actions, suits or proceedings that (a) are set
forth in Section 4.12 or any other Section of the Company's Disclosure Letter or
(b), individually or, with respect to multiple actions, suits or proceedings
that allege similar theories of recovery based on similar facts, in the
aggregate, could not reasonably be expected to have a Material Adverse Effect on
the Company.  There are no claims pending

                         Agreement and Plan of Merger

                                      -12-
<PAGE>
 
or, to the Knowledge of the Company, threatened by any Persons against the
Company or any of its Subsidiaries for indemnification pursuant to any statute,
organizational document, contract or otherwise with respect to any action, suit,
investigation or proceeding pending in any Court or before or by any
Governmental Authority.  Except as set forth in Section 4.12 of the Company's
Disclosure Letter, the Company and its Subsidiaries are in substantial
compliance with all applicable Laws and Regulations and are not in default with
respect to any Order applicable to the Company or any of its Subsidiaries,
except such events of noncompliance or defaults that, individually or in the
aggregate, could not reasonably be expected to have a Material Adverse Effect on
the Company.

     SECTION 4.13   Employee Benefit Plans.
                    ---------------------- 

          (a)  Each Benefit Plan of the Company and its Subsidiaries is listed
     in Section 4.13(a) of the Company's Disclosure Letter, including, with
     respect to Terminated Benefit Plans, the date of termination. True and
     correct copies of each of the following have been made available to the
     Acquiror: (i) the most recent annual report (Form 5500) relating to each
     such Current Benefit Plan filed with the IRS, (ii) each such Current
     Benefit Plan, (iii) the trust agreement, if any, relating to each such
     Current Benefit Plan, (iv) the most recent summary plan description for
     each such Current Benefit Plan for which a summary plan description is
     required by ERISA, (v) the most recent actuarial report or valuation
     relating to each such Current Benefit Plan subject to Title IV of ERISA and
     (vi) the most recent determination letter, if any, issued by the IRS with
     respect to any such Current Benefit Plan qualified under Section 401 of the
     Code.

          (b)  No event has occurred and, to the Knowledge of the Company, there
     exists no condition or set of circumstances in connection with which the
     Company or any of its Subsidiaries could be subject to any liability under
     the terms of such Benefit Plans, or with respect to any such Benefit Plans,
     under ERISA, the Code or any other applicable Law, other than any condition
     or set of circumstances that could not reasonably be expected to have a
     Material Adverse Effect on the Company.

          (c)  As to any such Current Benefit Plan intended to be qualified
     under Section 401 of the Code, such Benefit Plan has been determined by the
     IRS to satisfy in form the requirements of such Section and there has been
     no termination or partial termination of such Benefit Plan within the
     meaning of Section 411(d)(3) of the Code.

          (d)  As to any such Terminated Benefit Plan intended to have been
     qualified under Section 401 of the Code, such Terminated Benefit Plan
     received a favorable determination letter from the IRS with respect to its
     termination.

          (e)  There are no actions, suits or claims pending (other than routine
     claims for benefits) or, to the Knowledge of the Company, threatened
     against, or with respect to, any of such Benefit Plans or their assets that
     could reasonably be expected to have a Material Adverse Effect on the
     Company.

                         Agreement and Plan of Merger

                                     -13-
<PAGE>
 
          (f)  To the Knowledge of the Company, there is no matter pending
     (other than routine qualification determination filings) with respect to
     any of such Benefit Plans before the IRS, the Department of Labor or the
     PBGC.

          (g)  All contributions required to be made by the Company or the
     Company's Subsidiaries to such Benefit Plans pursuant to their terms and
     provisions have been made timely.

          (h)  As to any such Current Benefit Plan subject to Title IV of ERISA,
     (i) there has been no event or condition which presents a material risk of
     plan termination, (ii) no accumulated funding deficiency, whether or not
     waived, within the meaning of Section 302 of ERISA or Section 412 of the
     Code has been incurred within six years prior to date of this Agreement,
     (iii) no reportable event within the meaning of Section 4043 of ERISA (for
     which the disclosure requirements of Regulation section 2615.3 promulgated
     by the PBGC have not been waived) has occurred within six years prior to
     the date of this Agreement, (iv) no notice of intent to terminate such
     Benefit Plan has been given under Section 4041 of ERISA, (v) no proceeding
     has been instituted under Section 4042 of ERISA to terminate such Benefit
     Plan, (vi) no liability to the PBGC has been incurred (other than with
     respect to required premium payments) and (vii) the assets of the Benefit
     Plan equal or exceed the actuarial present value of the benefit
     liabilities, within the meaning of Section 4041 of ERISA, under the Benefit
     Plan, based upon reasonable actuarial assumptions and the asset valuation
     principles established by the PBGC.

          (i)  Except as set forth in Section 4.13(i) of the Company's
     Disclosure Letter, in connection with the consummation of the transactions
     contemplated by this Agreement, no payments have been or will be made under
     any such Current Benefit Plans or any of the programs, agreements, policies
     or other arrangements described in Section 4.13(k) of the Company's
     Disclosure Letter which, in the aggregate, would be nondeductible under
     Section 280G of the Code.

          (j)  Except as set forth in Section 4.13(j) of the Company's
     Disclosure Letter, the execution and delivery of this Agreement and the
     consummation of the transactions contemplated hereby will not (i) require
     the Company or any of its Subsidiaries to make a larger contribution to, or
     pay greater benefits under, any Current Benefit Plan or any of the
     programs, agreements, policies or other arrangements described in Section
     4.13(k) of the Company's Disclosure Letter than it otherwise would or (ii)
     create or give rise to any additional vested rights or service credits
     under any Current Benefit Plan or any of such programs, agreements,
     policies or other arrangements.

          (k)  Except as set forth in Section 4.13(k) of the Company's
     Disclosure Letter, neither the Company nor any of its Subsidiaries is a
     party to or is bound by any severance agreement (involving $50,000 or
     more), program or policy. True and correct copies of all employment
     agreements with officers of the Company and its Subsidiaries,

                         Agreement and Plan of Merger

                                     -14-
<PAGE>
 
     and all vacation, overtime and other compensation policies of the Company
     and its Subsidiaries relating to their employees have been made available
     to the Acquiror.

          (l)  Except as set forth in Section 4.13(l) of the Company's
     Disclosure Letter, no Benefit Plan provides retiree medical or retiree life
     insurance benefits to any Person and neither the Company nor any of its
     Subsidiaries is contractually or otherwise obligated (whether or not in
     writing) to provide any Person with life insurance or medical benefits upon
     retirement or termination of employment, other than as required by the
     provisions of Sections 601 through 608 of ERISA and Section 4980B of the
     Code. Each Benefit Plan or other arrangement described in Section 4.13(l)
     of the Company's Disclosure Letter may be unilaterally amended or
     terminated in its entirety without liability except as to benefits accrued
     thereunder prior to such amendment or termination.

          (m)  Neither the Company nor any of its Subsidiaries contributes or
     has an obligation to contribute, and has not within six years prior to the
     date of this Agreement contributed or had an obligation to contribute, to a
     multiemployer plan within the meaning of Section 3(37) of ERISA.

          (n)  Except as set forth in Section 4.13(n) of the Company's
     Disclosure Letter, the vacation policies of the Company and its
     Subsidiaries do not provide for carryover vacation from one calendar year
     to the next.

          (o)  No collective bargaining agreement to which the Company or any of
     its Subsidiaries is a party is currently in effect or is being negotiated
     by the Company or any of its Subsidiaries. There is no pending or, to the
     Knowledge of the Company, threatened labor dispute, strike or work stoppage
     against the Company or any of its Subsidiaries that could reasonably be
     expected to have a Material Adverse Effect on the Company. To the Knowledge
     of the Company, neither the Company or any of its Subsidiaries nor any
     representative or employee of the Company or any of its Subsidiaries has in
     the United States committed any unfair labor practices in connection with
     the operation of the business of the Company and its Subsidiaries, and
     there is no pending or, to the Knowledge of the Company, threatened charge
     or complaint against the Company or any of its Subsidiaries by the National
     Labor Relations Board or any comparable agency of any state of the United
     States.

          SECTION 4.14  Taxes.
                        ----- 

          (a)  Except for such matters as could not reasonably be expected to
     have a Material Adverse Effect on the Company, (i) all  Tax Returns that
     are required to be filed by or with respect to the Company or any of its
     Subsidiaries on or before the Effective Time have been or will be timely
     filed, (ii) all Taxes that are due on or before the Effective Time have
     been or will be timely paid in full, (iii) all withholding Tax requirements
     imposed on or with respect to the Company or any of its Subsidiaries have
     been or will be satisfied in full in all respects and (iv) no penalty,
     interest or other charge

                         Agreement and Plan of Merger

                                     -14-
<PAGE>
 
     is or will become due with respect to the late filing of any such Tax
     Return or late payment of any such Tax.

          (b)  Except as set forth in Section 4.14(b) of the Company's
     Disclosure Letter, all Tax Returns have been audited by the applicable
     Governmental Authority or the applicable statute of limitations has expired
     for the period covered by such Tax Returns.

          (c)  Except as set forth in Section 4.14(c) of the Company's
     Disclosure Letter, there is not in force any extension of time with respect
     to the due date for the filing of any material Tax Return or any waiver or
     agreement for any extension of time for the assessment or payment of any
     material Tax due with respect to the period covered by any Tax Return.

          (d)  There is no claim against the Company or any of its Subsidiaries
     for any Taxes, and no assessment, deficiency or adjustment has been
     asserted or proposed with respect to any Tax Return, that, in either case,
     could reasonably be expected to have a Material Adverse Effect on the
     Company.

          (e)  Except as set forth in Section 4.14(e) of the Company's
     Disclosure Letter, none of the Company and its Subsidiaries, during the
     last ten years, has been a member of an affiliated group filing a
     consolidated federal income Tax Return other than the affiliated group of
     which the Company is the common parent corporation.

     SECTION 4.15   Environmental Matters.  Except for matters disclosed in
                    ---------------------                                  
Section 4.15 of the Company's Disclosure Letter and except for matters that,
individually or in the aggregate, could not reasonably be expected to have a
Material Adverse Effect on the Company, (a) the properties, operations and
activities of the Company and its Subsidiaries are in compliance with all
applicable Environmental Laws; (b) the Company and its Subsidiaries and the
properties and operations of the Company and its Subsidiaries are not subject to
any existing, pending or, to the Knowledge of the Company, threatened action,
suit, investigation, inquiry or proceeding by or before any Court or
Governmental Authority under any Environmental Law; (c) all Permits, if any,
required to be obtained or filed by the Company or any of its Subsidiaries under
any Environmental Law in connection with the business of the Company and its
Subsidiaries have been obtained or filed and are valid and currently in full
force and effect; (d) there has been no release of any hazardous substance,
pollutant or contaminant into the environment by the Company or its Subsidiaries
or in connection with their properties or operations; (e) to the Company's
knowledge, there has been no exposure (attributable to the action of the Company
or its Subsidiaries) of any Person or property to any hazardous substance,
pollutant or contaminant in connection with the properties, operations and
activities of the Company and its Subsidiaries; and (f) the Company and its
Subsidiaries have made available to the Acquiror all internal and external
environmental audits and studies and all correspondence on substantial
environmental matters (in each case relevant to the Company or any of its
Subsidiaries) in the possession of the Company or its Subsidiaries.

                         Agreement and Plan of Merger

                                     -16-
<PAGE>
 
     SECTION 4.16   Intellectual Property.
                    --------------------- 

          (a)  The Company or one or more of its Subsidiaries own, or hold
     licenses under or otherwise have the right to use or sublicense, all
     foreign and domestic patents, trademarks (common law and registered),
     trademark registration applications, service marks (common law and
     registered), service mark registration applications, trade names and
     copyrights, copyright applications, trade secrets, know-how and other
     proprietary information (including the Software) as are necessary for the
     conduct of the business of the Company and its Subsidiaries as currently
     conducted except for any such intellectual property as to which the failure
     to own or hold licenses could not reasonably be expected to have a Material
     Adverse Effect on the Company. Neither the Company nor any of its
     Subsidiaries is currently in receipt of any notice of infringement or
     notice of conflict with the asserted rights of others in any patents,
     trademarks, service marks, trade names, trade secrets and copyrights owned
     or held by other Persons, except, in each case, for matters that could not
     reasonably be expected to have a Material Adverse Effect on the Company.
     Neither the execution and delivery of this Agreement nor consummation of
     the transactions contemplated hereby will violate or breach the terms of or
     cause any cancellation of any material license held by the Company or any
     of its Subsidiaries under, any patent, trademark, service mark, trade name,
     trade secret or copyright.

          (b)  The list of components contained in the definition of Software
     is, in all material respects, a true, accurate, and complete list of the
     software applications with respect to which the Company has an ownership
     interest. The Software, and its use, licensing, copying and/or
     distribution, do not infringe or violate any copyrights, trade secrets,
     patents, or other proprietary rights of any third party. Except as set
     forth in Section 4.12 of the Company's Disclosure Letter, no claim of
     infringement of any patent, copyright, trade secret, or other proprietary
     right is pending against the Company. All security devices, techniques, and
     applications used by the Company and its Subsidiaries and contained within
     the Software can be identified and disabled by the Company. Section 4.16(b)
     of the Company's Disclosure Letter sets forth material third party software
     marketed by the Company and/or embedded into the Software.

     SECTION 4.17   Insurance.  The Company and its Subsidiaries own and are
                    ---------                                               
beneficiaries under all such insurance policies underwritten by reputable
insurers that, as to risks insured, coverages and related limits and
deductibles, are customary in the industries in which the Company and its
Subsidiaries operate. To the Knowledge of the Company, all such policies are in
full force and effect and all premiums due thereon have been paid.  Section 4.17
of the Company's Disclosure Letter sets forth a list, including the name of the
underwriter, the risks insured, coverage and related limits and deductibles,
expiration dates and significant riders, of the principal insurance policies
currently maintained by the Company and its Subsidiaries.

     SECTION 4.18   Pooling; Tax Matters.  To the Knowledge of the Company,
                    --------------------                                   
neither the Company nor any of its Affiliates has taken or agreed to take any
action that would prevent (a) the Merger from being treated for financial
accounting purposes as a "pooling of interests"

                         Agreement and Plan of Merger

                                     -17-
<PAGE>
 
in accordance with generally accepted accounting principles and the Regulations
and interpretations of the Commission or (b) the Merger from constituting a
reorganization within the meaning of section 368(a) of the Code.  Specifically:

          (i)    To the Knowledge of the Company, there is no plan or intention
     by any stockholder of the Company who owns 5 percent or more of the Company
     Common Stock and there is no plan or intention on the part of any of the
     remaining stockholders of the Company, to sell, exchange or otherwise
     dispose of a number of shares of Acquiror Common Stock to be received in
     the Merger that would reduce the ownership of Acquiror Common Stock by the
     stockholders of the Company to a number of shares having a value, as of the
     Effective Time, of less than 50 percent of the value of all Company Common
     Stock (including shares of Company Common Stock sold for cash in lieu of
     fractional shares of Acquiror Common Stock) outstanding immediately prior
     to the Effective Time.

          (ii)   The Company and the stockholders of the Company will each pay
     their respective expenses, if any, incurred in connection with the Merger.

          (iii)  There is no intercorporate indebtedness existing between the
     Company and the Acquiror or between the Company and Newco that was issued,
     acquired, or will be settled at a discount.

          (iv)   The Company is not an investment company as defined in section
     368(a)(2)(F)(iii) and (iv) of the Code.

          (v)    The Company is not under the jurisdiction of a court in a title
     11 or similar case within the meaning of section 368(a)(3)(A) of the Code.

          (vi)   The liabilities of the Company that will be assumed by the
     Surviving Corporation in the Merger and any liability to which the assets
     to be transferred to the Surviving Corporation are subject were incurred by
     the Company in the ordinary course of its business.  The total amount of
     such liabilities does not equal or exceed the aggregate basis of the
     Company in the assets to be transferred to the Surviving Corporation in the
     Merger.

     SECTION 4.19   Affiliates.  Section 4.19 of the Company's Disclosure Letter
                    ----------                                                  
contains a true and complete list of all Persons who, to the Knowledge of the
Company, may be deemed to be Affiliates of the Company, excluding all its
Subsidiaries but including all directors and executive officers of the Company.

     SECTION 4.20   Certain Business Practices.  As of the date of this
                    --------------------------                         
Agreement, neither the Company or any of its Subsidiaries nor any director,
officer, employee or  agent of the Company or any of its Subsidiaries has (i)
used any funds for unlawful contributions, gifts, entertainment or other
unlawful payments relating to political activity, (ii) made any unlawful

                         Agreement and Plan of Merger

                                     -18-
<PAGE>
 
payment to any foreign or domestic government official or employee or to any
foreign or domestic political party or campaign or violated any provision of the
Foreign Corrupt Practices Act of 1977, as amended, (iii) consummated any
transaction, made any payment, entered into any agreement or arrangement or
taken any other action in violation of Section 1128B(b) of the Social Security
Act, as amended, or (iv) made any other unlawful payment, except for any such
matters that could not reasonably be expected to have a Material Adverse Effect
on the Company.

     SECTION 4.21   Opinion of Financial Advisor.  The Company has received the
                    ----------------------------                               
opinion of Morgan Stanley & Co. Incorporated on the date of this Agreement to
the effect that the Common Stock Exchange Ratio is fair, from a financial point
of view, to the holders of Company Common Stock.

     SECTION 4.22   Brokers.  No broker, finder or investment banker (other than
                    -------                                                     
Morgan Stanley & Co. Incorporated) is entitled to any brokerage, finder's or
other fee or commission in connection with the transactions contemplated by this
Agreement based upon arrangements made by or on behalf of the Company.  Prior to
the date of this Agreement, the Company has made available to the Acquiror a
complete and correct copy of all agreements between the Company and Morgan
Stanley & Co. Incorporated pursuant to which such firm will be entitled to any
payment relating to the transactions contemplated by this Agreement.

     SECTION 4.23   Acquiring Person.  None of the Acquiror Companies is (a) an
                    ----------------                                           
"Acquiring Person" as defined in the Company Rights Plan or (b) will become an
"Acquiring Person" as a result of any of the transactions contemplated by this
Agreement.

                                   ARTICLE V

                  REPRESENTATIONS AND WARRANTIES OF ACQUIROR

     The Acquiror Companies hereby represent and warrant to the Company that:

     SECTION 5.1    Organization and Qualification; Subsidiaries.  The Acquiror,
                    --------------------------------------------                
Newco and each other Subsidiary of the Acquiror are legal entities duly
organized, validly existing and in good standing under the laws of their
respective jurisdictions of incorporation or organization, have all requisite
power and authority to own, lease and operate their respective properties and to
carry on their business as it is now being conducted and are duly qualified and
in good standing to do business in each jurisdiction in which the nature of the
business conducted by them or the ownership or leasing of their respective
properties makes such qualification necessary, other than any matters, including
the failure to be so duly qualified and in good standing, that could not
reasonably be expected to have a Material Adverse Effect on the Acquiror.
Section 5.01 of the Acquiror's Disclosure Letter sets forth, as of the date of
this Agreement, a true and complete list of all Significant Subsidiaries of the
Acquiror, together with the jurisdiction of incorporation of each such
Subsidiary and the percentage of each such Subsidiary's outstanding capital
stock or other equity interests owned by the Acquiror or another Subsidiary of
the Acquiror.

                         Agreement and Plan of Merger

                                     -19-
<PAGE>
 
     SECTION 5.2    Certificate of Incorporation and Bylaws.  The Acquiror has
                    ---------------------------------------                   
heretofore marked for identification and furnished to the Company complete and
correct copies of the certificate of incorporation and the bylaws or the
equivalent organizational documents, in each case as amended or restated to the
date hereof, of the Acquiror and each of its Significant Subsidiaries. None of
the Acquiror, Newco or any of the Acquiror's Significant Subsidiaries is in
violation of any of the provisions of its certificate of incorporation or bylaws
(or equivalent organizational documents).

     SECTION 5.3    Capitalization.
                    -------------- 

          (a)  The authorized capital stock of the Acquiror consists of (i)
     200,000,000 shares of Acquiror Common Stock of which as of March 31, 1996:
     114,787,914 shares were issued and outstanding, all of which are duly
     authorized, validly issued, fully paid and nonassessable and not subject to
     preemptive rights created by statute, the Acquiror's certificate of
     incorporation or bylaws or any agreement to which the Acquiror is a party
     or is bound, and (ii) 5,000,000 shares of Preferred Stock, par value $1.00
     per share, of which none is issued but of which 2,000,000 shares have been
     designated as Series A Junior Participating Preferred Stock. Between March
     31, 1996 and the date of this Agreement, no shares of Acquiror Common Stock
     have been issued by the Acquiror except pursuant to the exercise of
     outstanding Acquiror Stock Options and otherwise to the extent set forth in
     Section 5.03(a) of the Acquiror's Disclosure Letter. Except as set forth in
     Section 5.03(a) of the Acquiror's Disclosure Letter, from March 31, 1996 to
     the date of this Agreement, the Acquiror has not granted any options for,
     or other rights to purchase, shares of Acquiror Common Stock.

          (b)  Except as set forth in Section 5.03(b) of the Acquiror's
     Disclosure Letter, no shares of Acquiror Common Stock are reserved for
     issuance, and, except for the Acquiror's Rights Plan, the Acquiror Stock
     Options listed in Section 5.03(b) of the Acquiror's Disclosure Letter and
     the other agreements listed in Section 5.03(b) of the Acquiror's Disclosure
     Letter, there are no contracts, agreements, commitments or arrangements
     obligating the Acquiror (i) to offer, sell, issue or grant any shares of,
     or any options, warrants or rights of any kind to acquire any shares of, or
     any securities that are convertible into or exchangeable for any shares of,
     capital stock of the Acquiror, (ii) to redeem, purchase or acquire, or
     offer to purchase or acquire, any outstanding shares of, or any outstanding
     options, warrants or rights of any kind to acquire any shares of, or any
     outstanding securities that are convertible into or exchangeable for any
     shares of, capital stock of the Acquiror or (iii) to grant any Lien on any
     shares of capital stock of the Acquiror.

          (c)  Except as set forth in the Acquiror's Disclosure Letter, (i) all
     the issued and outstanding shares of capital stock of, or other equity
     interests in, each Subsidiary of the Acquiror are owned by the Acquiror or
     one of its Subsidiaries, have been duly authorized and are validly issued,
     and, with respect to capital stock, are fully paid and nonassessable, and
     were not issued in violation of any preemptive or similar rights of any

                         Agreement and Plan of Merger

                                     -20-
<PAGE>
 
     Person; (ii) all such issued and outstanding shares, or other equity
     interests, that are owned by the Acquiror or one of its Subsidiaries are
     owned free and clear of all Liens; (iii) no shares of capital stock of, or
     other equity interests in, any Subsidiary of the Acquiror are reserved for
     issuance, and there are no contracts, agreements, commitments or
     arrangements obligating the Acquiror or any of its Subsidiaries (A) to
     offer, sell, issue, grant, pledge, dispose of or encumber any shares of
     capital stock of, or other equity interests in, or any options, warrants or
     rights of any kind to acquire any shares of capital stock of, or other
     equity interests in, or any securities that are convertible into or
     exchangeable for any shares of capital stock of, or other equity interests
     in, any of the Subsidiaries of the Acquiror or (B) to redeem, purchase or
     acquire, or offer to purchase or acquire, any outstanding shares of capital
     stock of, or other equity interests in, or any outstanding options,
     warrants or rights of any kind to acquire any shares of capital stock of or
     other equity interest in, or any outstanding securities that are
     convertible into or exchangeable for, any shares of capital stock of, or
     other equity interests in, any of the Subsidiaries of the Acquiror or (C)
     to grant any Lien on any outstanding shares of capital stock of, or other
     equity interest in, any of the Subsidiaries of the Acquiror; except for any
     matter under clause (i), (ii) or (iii) of this Section 5.03(c) that could
     not reasonably be expected to have a Material Adverse Effect on the
     Acquiror.

          (d) There are no voting trusts, proxies or other agreements,
     commitments or understandings of any character to which the Acquiror or any
     of its Significant Subsidiaries is a party or by which the Acquiror or any
     of its Significant Subsidiaries is bound with respect to the voting of any
     shares of capital stock of the Acquiror or any of its Significant
     Subsidiaries.

     SECTION 5.4    Authorization of Agreement.  Each of the  Acquiror and Newco
                    --------------------------                                  
has all requisite corporate power and authority to execute and deliver this
Agreement and each instrument required hereby to be executed and delivered by it
at the Closing, to perform its obligations hereunder and thereunder and to
consummate the transactions contemplated hereby. The execution and delivery by
the Acquiror and Newco of this Agreement and each instrument required hereby to
be executed and delivered by the Acquiror or Newco at the Closing and the
performance of their respective obligations hereunder and thereunder have been
duly and validly authorized by all requisite corporate action (including
stockholder action) on the part of the Acquiror and Newco, respectively. This
Agreement has been duly executed and delivered by the Acquiror and Newco and
(assuming due authorization, execution and delivery hereof by the other party
hereto) constitutes a legal, valid and binding obligation of the Acquiror and
Newco, enforceable against the Acquiror and Newco in accordance with its terms,
except as the same may be limited by legal principles of general applicability
governing the application and availability of equitable remedies.

     SECTION 5.5    Approvals.  Except for the applicable requirements, if any,
                    ---------                                                  
of (a) the Securities Act, (b) the Exchange Act, (c) state securities or blue
sky laws, (d) the HSR Act, (e) the competition Laws, Regulations and Orders of
foreign Governmental Authorities as set forth in the Acquiror's Disclosure
Letter, (f) the NYSE, (g) the filing and recordation of


                         Agreement and Plan of Merger

                                     -21-
<PAGE>
 
appropriate merger documents as required by the GCL and (h) those Laws,
Regulations and Orders noncompliance with which could not reasonably be expected
to have a material adverse effect on the ability of the Acquiror or Newco to
perform its obligations under this Agreement or to have a Material Adverse
Effect on the Acquiror, no filing or registration with, no waiting period
imposed by and no Permit or Order of, any Governmental Authority is required
under any Law, Regulation or Order applicable to the Acquiror or Newco to permit
the Acquiror or Newco to execute, deliver or perform this Agreement or any
instrument required hereby to be executed and delivered by it at the Closing.

     SECTION 5.6    No Violation.  Except as set forth in Section 5.06 of the
                    ------------                                             
Acquiror's Disclosure Letter, assuming effectuation of all filings and
registrations with, termination or expiration of any applicable waiting periods
imposed by and receipt of all Permits and Orders of, Governmental Authorities
indicated as required in Section 5.05, neither the execution and delivery by the
Acquiror or Newco of this Agreement or any instrument required hereby to be
executed and delivered by the Acquiror or Newco at the Closing nor the
performance by the Acquiror or Newco of their respective obligations hereunder
or thereunder will (a) violate or breach the terms of or cause a default under
(i) any Law, Regulation or Order applicable to the Acquiror or Newco, (ii) the
certificate of incorporation or bylaws of the Acquiror or Newco or (iii) any
contract or agreement to which the Acquiror or any of its Subsidiaries is a
party or by which it or any of its properties or assets is bound, or (b) with
the passage of time, the giving of notice or the taking of any action by a third
Person, have any of the effects set forth in clause (a) of this Section, except
in any such case for any matters described in this Section that could not
reasonably be expected to have a material adverse effect upon the ability of the
Acquiror or Newco to perform its obligations under this Agreement or a Material
Adverse Effect on the Acquiror.

     SECTION 5.7    Reports.
                    ------- 

          (a)  Since December 31, 1993, the Acquiror has filed all SEC Reports
     of the Acquiror required to be filed with the Commission. The SEC Reports
     of the Acquiror, including those filed after the date of this Agreement and
     prior to the Effective Time, (i) were prepared in all material respects in
     accordance with the applicable requirements of the Securities Act and the
     Exchange Act, as the case may be, and the applicable Regulations of the
     Commission thereunder and (ii) did not at the time they were filed contain
     any untrue statement of a material fact or omit to state a material fact
     required to be stated therein or necessary in order to make the statements
     therein, in the light of the circumstances under which they were made, not
     misleading.

          (b)  The Acquiror's Consolidated Financial Statements and any
     consolidated financial statements of the Acquiror (including any related
     notes thereto) contained in any SEC Reports of the Acquiror filed with the
     Commission after the date of this Agreement (i) have been or will have been
     prepared in accordance with the published Regulations of the Commission and
     in accordance with GAAP (except (A) to the extent required by changes in
     GAAP and (B), with respect to SEC Reports of the Acquiror filed prior to
     the


                         Agreement and Plan of Merger

                                     -22-
<PAGE>
 
     date of this Agreement, as may be indicated in the notes thereto) and (ii)
     fairly present the consolidated financial position of the Acquiror and its
     Subsidiaries as of the respective dates thereof and the consolidated
     results of their operations and cash flows for the periods indicated
     (including, in the case of any unaudited interim financial statements,
     reasonable estimates of normal and recurring year-end adjustments).
 
          (c)  Except as set forth in the Acquiror's Disclosure Letter, there
     exist no liabilities or obligations of the Acquiror and its Subsidiaries
     that are Material to the Acquiror, whether accrued, absolute, contingent or
     threatened, that would be required to be reflected, reserved for or
     disclosed under GAAP in consolidated financial statements of the Acquiror
     as of and for the period ended on the date of this representation and
     warranty, other than (i) liabilities or obligations that are adequately
     reflected, reserved for or disclosed in the Acquiror's Consolidated
     Financial Statements, (ii) liabilities or obligations incurred in the
     ordinary course of business of the Acquiror and its Subsidiaries since
     March 31, 1996, (iii) liabilities or obligations the incurrence of which is
     not prohibited by Section 6.02(b) and (iv) liabilities or obligations that
     are not Material to the Acquiror.

     SECTION 5.8    No Material Adverse Effect; Conduct.
                    ----------------------------------- 

          (a)  Since March 31, 1996, no event (other than any event that is
     directly attributable to the prospect of consummation of the Merger or is
     of general application to all or a substantial portion of the Acquiror's
     industry and other than any event that is expressly subject to any other
     representation or warranty contained in Article V) has, to the Knowledge of
     the Acquiror, occurred that, individually or together with other similar
     events, could reasonably be expected to constitute or cause a Material
     Adverse Effect on the Acquiror.

          (b)  Except as disclosed in the Acquiror's Disclosure Letter, during
     the period from March 31, 1996 to the date of this Agreement, neither the
     Acquiror nor any of its Subsidiaries has engaged in any conduct that is
     proscribed during the period from the date of this Agreement to the
     Effective Time by subsections (i) through (vii) of Section 6.02(b) or
     agreed in writing or otherwise during such period prior to the date of this
     Agreement to engage in any such conduct.

     SECTION 5.9    Title to Properties.  The Acquiror or its Subsidiaries,
                    -------------------                                    
individually or together, have indefeasible title to all of the properties
reflected in the Acquiror's Consolidated Balance Sheet, other than any
properties reflected in the Acquiror's Consolidated Balance Sheet that (i) have
been sold or otherwise disposed of since the date of the Acquiror's Consolidated
Balance Sheet or (ii) are not, individually or in the aggregate, Material to the
Acquiror, free and clear of Liens, other than (x) Liens the existence of which
is reflected in the Acquiror's Consolidated Financial Statements, (y) Permitted
Encumbrances and (z) Liens that, individually or in the aggregate, are not
Material to the Acquiror. The Acquiror or its Subsidiaries, individually or
together, hold under valid lease agreements all real and personal properties


                         Agreement and Plan of Merger

                                     -23-
<PAGE>
 
reflected in the Acquiror's Consolidated Balance Sheet as being held under
capitalized leases, and all real and personal property that is subject to the
operating leases to which reference is made in the notes to the Acquiror's
Audited Consolidated Financial Statements, and enjoy peaceful and undisturbed
possession of such properties under such leases, other than (i) any properties
as to which such leases have terminated in the ordinary course of business since
the date of the Acquiror's Consolidated Balance Sheet and (ii) any properties
that, individually or in the aggregate, are not Material to the Acquiror.

     SECTION 5.10   Certain Obligations.  Except as set forth in Section 5.10 of
                    -------------------                                         
the Acquiror's Disclosure Letter, all Material Contracts to which the Acquiror
or any of its Subsidiaries is a party are in full force and effect, the Acquiror
or the Subsidiary of the Acquiror that is a party to or bound by such Material
Contract has performed its obligations thereunder to date and, to the Knowledge
of the Acquiror, each other party thereto has performed its obligations
thereunder to date, other than any failure of any such Material Contract to be
in full force and effect or any nonperformance thereof that could not reasonably
be expected to have a Material Adverse Effect on the Acquiror.

     SECTION 5.11   Permits; Compliance.  To the Knowledge of the Acquiror, the
                    -------------------                                        
Acquiror and its Subsidiaries have obtained all Permits that are necessary to
carry on their businesses as currently conducted, except for any such Permits
that the failure to possess which, individually or in the aggregate, could not
reasonably be expected to have a Material Adverse Effect on the Acquiror. Such
Permits are in full force and effect, have not been violated in any respect that
could reasonably be expected to have a Material Adverse Effect on the Acquiror
and, to the Knowledge of the Acquiror, no suspension, revocation or cancellation
thereof has been threatened and there is no action, proceeding or investigation
pending or threatened regarding suspension, revocation or cancellation of any of
such Permits, except where the suspension, revocation or cancellation of such
Permits could not reasonably be expected to have a Material Adverse Effect on
the Acquiror.

     SECTION 5.12   Litigation; Compliance with Laws.  There are no actions,
                    --------------------------------                        
suits, investigations or proceedings (including any proceedings in arbitration)
pending or, to the Knowledge of the Acquiror, threatened against the Acquiror or
any of its Subsidiaries, at law or in equity, in any Court or before or by any
Governmental Authority, except actions, suits or proceedings that (a) are set
forth in Section 5.12 or any other Section of the Acquiror's Disclosure Letter
or (b), individually or, with respect to multiple actions, suits or proceedings
that allege similar theories of recovery based on similar facts, in the
aggregate, could not reasonably be expected to have a Material Adverse Effect on
the Acquiror. The Acquiror and its Subsidiaries are in substantial compliance
with all applicable Laws and Regulations and are not in default with respect to
any Order applicable to the Acquiror or any of its Subsidiaries, except such
events of noncompliance or defaults that, individually or in the aggregate,
could not reasonably be expected to have a Material Adverse Effect on the
Acquiror.


                         Agreement and Plan of Merger

                                     -24-
<PAGE>
 
     SECTION 5.13   Employee Benefit Plans.
                    ---------------------- 

          (a)  No event has occurred and, to the Knowledge of the Acquiror,
     there exists no condition or set of circumstances in connection with which
     the Acquiror or any of its Subsidiaries could be subject to any liability
     under the terms of any Benefit Plans of the Acquiror or any of its
     Subsidiaries or, with respect to any such Benefit Plan, under ERISA, the
     Code or any other applicable Law, other than any condition or set of
     circumstances that could not reasonably be expected to have a Material
     Adverse Effect on the Acquiror.

          (b)  As to any Current Benefit Plan included in such Benefit Plans
     that is intended to be qualified under Section 401 of the Code, such
     Current Benefit Plan satisfies in form the requirements of such Section and
     there has been no termination or partial termination of such Current
     Benefit Plan within the meaning of Section 411(d)(3) of the Code.

          (c)  As to any Terminated Benefit Plan included in such Benefit Plans
     that is intended to have been qualified under Section 401 of the Code, such
     Terminated Benefit Plan received a favorable determination letter from the
     IRS with respect to its termination.

          (d)  There are no actions, suits or claims pending (other than routine
     claims for benefits) or, to the Knowledge of the Acquiror, threatened
     against, or with respect to, any of such Benefit Plans or their assets that
     could reasonably be expected to have a Material Adverse Effect on the
     Acquiror.

          (e)  As to any such Current Benefit Plan subject to Title IV of ERISA,
     (i) there has been no event or condition which presents the material risk
     of plan termination, (ii) no accumulated funding deficiency, whether or not
     waived, within the meaning of Section 302 of ERISA or Section 412 of the
     Code has been incurred, (iii), except as set forth in Section 5.13(e) of
     the Acquiror's Disclosure Letter, no reportable event within the meaning of
     Section 4043 of ERISA (for which the disclosure requirements of Regulation
     section 2615.3 promulgated by the PBGC have not been waived) has occurred
     within six years prior to the date of this Agreement, (iv) no notice of
     intent to terminate such Benefit Plan has been given under Section 4041 of
     ERISA, (v) no proceeding has been instituted under Section 4042 of ERISA to
     terminate such Benefit Plan, (vi) no liability to the PBGC has been
     incurred (other than with respect to required premium payments) and (vii)
     the assets of the Benefit Plan equal or exceed the actuarial present value
     of the benefit liabilities, within the meaning of Section 4041 of ERISA,
     under the Benefit Plan, based upon reasonable actuarial assumptions and the
     asset valuation principles established by the PBGC.
     
          (f)  Neither the Acquiror nor any of its Subsidiaries contributes or
     has an obligation to contribute, and has not within six years prior to the
     date of this Agreement


                         Agreement and Plan of Merger

                                     -25-
<PAGE>
 
     contributed or had an obligation to contribute, to a multiemployer plan
     within the meaning of Section 3(37) of ERISA.

     SECTION 5.14   Taxes.
                    ----- 

          (a)  Except for such matters as could not reasonably be expected to
     have a Material Adverse Effect on the Acquiror, (i) all Tax Returns that
     are required to be filed by or with respect to the Acquiror or any of its
     Subsidiaries on or before the Effective Time have been or will be timely
     filed, (ii) all Taxes that are due on or before the Effective Time have
     been or will be timely paid in full, (iii) all withholding Tax requirements
     imposed on or with respect to the Acquiror or any of its Subsidiaries have
     been or will be satisfied in full in all respects and (iv) no penalty,
     interest or other charge is or will become due with respect to the late
     filing of any such Tax Return or late payment of any such Tax.

          (b)  There is no claim against the Acquiror or any of its Subsidiaries
     for any Taxes, and no assessment, deficiency or adjustment has been
     asserted or proposed with respect to any Tax Return, that, in either case,
     could reasonably be expected to have a Material Adverse Effect on the
     Acquiror.

     SECTION 5.15   Environmental Matters.  Except for matters disclosed in
                    ---------------------                                  
Section 5.15 of the Acquiror's Disclosure Letter and except for matters that,
individually or in the aggregate, could not reasonably be expected to have a
Material Adverse Effect on the Acquiror, (a) the properties, operations and
activities of the Acquiror and its Subsidiaries are in compliance with all
applicable Environmental Laws; (b) the Acquiror and its Subsidiaries and the
properties and operations of the Acquiror and its Subsidiaries are not subject
to any existing, pending or, to the Knowledge of the Acquiror, threatened
action, suit, investigation, inquiry or proceeding by or before any Court or
Governmental Authority under any Environmental Law; (c) all Permits, if any,
required to be obtained or filed by the Acquiror or any of its Subsidiaries
under any Environmental Law in connection with the business of the Acquiror and
its Subsidiaries have been obtained or filed and are valid and currently in full
force and effect; (d) there has been no release of any hazardous substance,
pollutant or contaminant into the environment by the Acquiror or its
Subsidiaries or in connection with their properties or operations; and (e) there
has been no exposure of any Person or property to any hazardous substance,
pollutant or contaminant in connection with the properties, operations and
activities of the Acquiror and its Subsidiaries.
 
     SECTION 5.16   Pooling; Tax Matters.  To the Knowledge of the Acquiror,
                    --------------------                                    
neither the Acquiror nor any of its Affiliates has taken or agreed to take any
action that would prevent (a) the Merger from being treated for financial
accounting purposes as a "pooling of interests" in accordance with generally
accepted accounting principles and the Regulations and interpretations of the
Commission or (b) the Merger from constituting a reorganization within the
meaning of section 368(a) of the Code. Specifically:


                         Agreement and Plan of Merger

                                     -26-
<PAGE>
 
          (i)    Following the Merger, the Surviving Corporation will hold at
     least 90 percent of the fair market value of the Company's net assets and
     at least 70 percent of the fair market value of the Company's gross assets
     and at least 90 percent of Newco's net assets and at least 70 percent of
     Newco's gross assets, held immediately prior to the Merger, taking into
     account amounts used to pay Merger expenses and any distributions other
     than regular dividends.

          (ii)   The Acquiror has no plan or intention to (A) liquidate the
     Surviving Corporation, (B) merge the Surviving Corporation with or into
     another corporation, (C) sell or otherwise dispose of the stock of the
     Surviving Corporation, (D) cause or permit the Surviving Corporation to
     issue additional shares of its capital stock that would result in the
     Acquiror's losing control (within the meaning of section 368(c) of the
     Code) of the Surviving Corporation, (E) cause or permit the Surviving
     Corporation to sell or otherwise dispose of any of its assets or of any of
     the assets acquired from Newco except for dispositions made in the ordinary
     course of business and dispositions to a corporation controlled (within the
     meaning of Section 368(c) of the Code) by the Surviving Corporation, or (F)
     reacquire any of the Acquiror Common Stock issued to the holders of Company
     Common Stock in the Merger.

          (iii)  Following the Merger, the Surviving Corporation will continue
     the historic business of the Company or use a significant portion of its
     assets in a business.

          (iv)   There is no intercorporate indebtedness existing between the
     Company and the Acquiror or between the Company and Newco that was issued,
     acquired, or will be settled at a discount.

          (v)    The Acquiror does not own, nor has it owned during the past
     five years, any shares of capital stock of the Company.

     SECTION 5.17   Affiliates.  Section 5.17 of the Acquiror's Disclosure
                    ----------                                            
Letter contains a true and complete list of all Persons who, to the Knowledge of
the Acquiror, may be deemed to be Affiliates of the Acquiror, excluding all its
Subsidiaries but including all directors and executive officers of the Acquiror.

     SECTION 5.18   Brokers.  Except as set forth in Section 5.18 of the
                    -------                                             
Acquiror's Disclosure Letter, no broker, finder or investment banker (other than
Dillon, Read & Co., Inc.) is entitled to any brokerage, finder's or other fee or
commission in connection with the transactions contemplated by this Agreement
based upon arrangements made by or on behalf of the Acquiror.

     SECTION 5.19   Acquiring Person.  Based on the information set forth in the
                    ----------------                                            
Company's SEC Reports, no holder of 5 percent or more of the outstanding Company
Common Stock whose existence is disclosed therein will at the Effective Time
become an "Acquiring


                         Agreement and Plan of Merger

                                     -27-
<PAGE>
 
Person", as such term is defined in the Acquiror's Rights Plan, as a result of
any of the transactions contemplated by this Agreement.

     SECTION 5.20   Proposal to Acquire the Acquiror.  There is not pending any
                    --------------------------------                           
bona fide proposal received by the Acquiror regarding any merger, consolidation
or reorganization of the Acquiror with any other Person as a result of which
less than a majority of the combined voting power of the securities of the
Person surviving such transaction would be held immediately after such
transaction by all the holders of Acquiror Common Stock immediately prior to
such transaction and for which transaction financing, to the extent required, is
then committed.

     SECTION 5.21   Certain Business Practices.  As of the date of this
                    --------------------------                         
Agreement, neither the Acquiror or any of its Subsidiaries nor any director,
officer, employee or agent of the Acquiror or any of its Subsidiaries has (i)
used any funds for unlawful contributions, gifts, entertainment or other
unlawful payments relating to political activity, (ii) made any unlawful payment
to any foreign or domestic government official or employee or to any foreign or
domestic political party or campaign or violated any provision of the Foreign
Corrupt Practices Act of 1977, as amended, (iii) consummated any transaction,
made any payment, entered into any agreement or arrangement or taken any other
action in violation of Section 1128B(b) of the Social Security Act, as amended,
or (iv) made any other unlawful payment, except for any such matters that could
not reasonably be expected to have a Material Adverse Effect on the Acquiror.
 
                                  ARTICLE VI

                                   COVENANTS

     SECTION 6.1    Affirmative Covenants.  Each of the Company and the Acquiror
                    ---------------------                                       
hereby covenants and agrees that, prior to the Effective Time, unless otherwise
expressly contem plated by this Agreement or consented to in writing by the
other, it will and will cause its Subsidiaries to:

          (a)  operate its business in the usual and ordinary course consistent
     with past practices;

          (b)  use all reasonable efforts to preserve substantially intact its
     business organization, maintain its rights and franchises, retain the
     services of its respective key employees and maintain its relationships
     with its respective customers and suppliers;

          (c)  maintain and keep its properties and assets in as good repair and
     condition as at present, ordinary wear and tear excepted, and maintain
     supplies and inventories in quantities consistent with its customary
     business practice; and

          (d)  use all reasonable efforts to keep in full force and effect
     insurance and bonds comparable in amount and scope of coverage to that
     currently maintained;


                         Agreement and Plan of Merger

                                     -28-
<PAGE>
 
except for any matters that, individually or in the aggregate, could not
reasonably be expected to have a Material Adverse Effect on such party.

     SECTION 6.2    Negative Covenants.
                    ------------------ 

          (a)  Except as set forth in Schedule 6.02(a) of the Company's
     Disclosure Letter, the Company covenants and agrees that, except as
     expressly contemplated by this Agreement or otherwise consented to in
     writing by the Acquiror, from the date of this Agreement until the
     Effective Time, it will not do, and will not permit any of its Subsidiaries
     to do, any of the following:

               (i)    (A) to increase the compensation payable to or to become
          payable to any director or executive officer, except for increases in
          salary or wages payable or to become payable upon promotion to an
          office having greater operational responsibilities or otherwise in the
          ordinary course of business and consistent with past practice; (B) to
          grant any severance or termination pay (other than pursuant to the
          normal severance policy of the Company or its Subsidiaries as in
          effect on the date of this Agreement) to, or enter into or amend in
          any material respect any employment or severance agreement, including
          any amendment whatsoever to the Employment Agreement, with, any
          director, officer or employee, either individually or as part of a
          class of similarly situated persons; (C) to establish, adopt or enter
          into any Benefit Plan or (D), except as may be required by applicable
          law and actions that are not inconsistent with the provisions of
          Section 7.09 of this Agreement, to amend, or to take any other actions
          (including the acceleration of vesting, waiving of performance
          criteria or the adjustment of awards or any other actions permitted
          upon a change in control of such party or a filing under Section 13(d)
          or 14(d) of the Exchange Act with respect to such party) with respect
          to any of the Benefit Plans of such party;

               (ii)   to declare or to pay any dividend on, or to make any other
          distribution in respect of, outstanding shares of capital stock,
          except for dividends by a wholly-owned Subsidiary of the Company to
          the Company or another wholly-owned Subsidiary of the Company;

               (iii)  (A) to redeem, purchase or acquire, or to offer to
          purchase or acquire, any outstanding shares of capital stock of, or
          other equity interests in, or any securities that are convertible into
          or exchangeable for any shares of capital stock of, or other equity
          interests in, or any outstanding options, warrants or rights of any
          kind to acquire any shares of capital stock of, or other equity
          interests in, the Company or any of its Subsidiaries (other than (1)
          any such acquisition by the Company or any of its wholly-owned
          Subsidiaries directly from any wholly-owned Subsidiary of the Company
          in exchange for capital contributions or loans to such Subsidiary, (2)
          any repurchase, forfeiture or retirement of shares of Company Common
          Stock or Company Stock Options occurring pursuant to the terms (as in


                         Agreement and Plan of Merger

                                     -29-
<PAGE>
 
          effect on the date of this Agreement) of any existing Benefit Plan of
          the Company or any of its Subsidiaries, (3) the repurchase of rights
          pursuant to the terms (as in effect on the date of this Agreement) of
          the Company Rights Agreement to the extent required by a court of
          competent jurisdiction or (4) any periodic purchase of Company Common
          Stock for allocation to employee's accounts occurring pursuant to the
          terms (as in effect on the date of this Agreement) of any existing
          employee stock purchase plan); (B) to effect any reorganization or
          recapitalization; or (C) to split, combine or reclassify any of the
          capital stock of, or other equity interests in, the Company or any of
          its Subsidiaries or to issue or to authorize or propose the issuance
          of any other securities in respect of, in lieu of or in substitution
          for, shares of such capital stock or such equity interests, other than
          intercompany transfers among the Company and its wholly-owned
          Subsidiaries or among such wholly-owned Subsidiaries;

               (iv)   (A) to offer, sell, issue or grant, or authorize the
          offering, sale, issuance or grant, of any shares of capital stock of,
          or other equity interests in, any securities convertible into or
          exchangeable for any shares of capital stock of, or other equity
          interests in, or any options, warrants or rights of any kind to
          acquire any shares of capital stock of, or other equity interests in,
          the Company or any of its Subsidiaries, other than issuances of
          Company Common Stock (1) upon the exercise of Company Stock Options
          outstanding at the date of this Agreement in accordance with the terms
          thereof (as in effect on the date of this Agreement), (2) upon the
          expiration of any restrictions upon issuance of any grant existing at
          the date of this Agreement of restricted stock or stock bonus pursuant
          to the terms (as in effect on the date of this Agreement) of any
          Benefit Plans of the Company or any of its Subsidiaries or (3) any
          periodic issuance of shares of Company Common Stock occurring pursuant
          to the terms (as in effect on the date of this Agreement) of any
          Benefit Plans of the Company or any of its Subsidiaries, (B), except
          as set forth in Section 4.08(b) of the Company's Disclosure Letter, to
          amend or otherwise modify the terms (as in effect on the date of this
          Agreement) of any outstanding options, warrants or rights the effect
          of which shall be to make such terms more favorable to the holders
          thereof (except as may be required by ERISA or other applicable law);
          (C) to take any action to accelerate the vesting of any outstanding
          Company Stock Options or (D) to grant any Lien with respect to any
          shares of capital stock of, or other equity interests in, any
          Subsidiary of the Company;

               (v)    except as set forth in Section 4.08(b) of the Company's
          Disclosure Letter, to acquire or agree to acquire, by merging or
          consolidating with, by purchasing an equity interest in or a portion
          of the assets of, or in any other manner, any business or any
          corporation, partnership, association or other business organization
          or division thereof or otherwise to acquire any assets of any other
          Person (other than the purchase of assets from suppliers or vendors in
          the ordinary course of business and consistent with past practice and
          acquisitions of equity


                         Agreement and Plan of Merger

                                     -30-
<PAGE>
 
          interests, assets and businesses in an amount not to exceed $250,000
          in the aggregate);

               (vi)   except as set forth in Section 4.08(b) of the Company's
          Disclosure Letter, to sell, lease, exchange or otherwise dispose of,
          or to grant any Lien (other than a Permitted Encumbrance) with respect
          to, any of the assets of the Company or any of its Subsidiaries that
          are Material to the Company, except for dispositions of assets and
          inventories in the ordinary course of business and consistent with
          past practice and dispositions of assets and purchase money Liens
          incurred in connection with the original acquisition of assets and
          secured by the assets acquired in an amount not to exceed $250,000 in
          the aggregate;

               (vii)  to adopt any amendments to its charter or bylaws or other
          organizational documents that would alter the terms of its capital
          stock or other equity interests or would have a material adverse
          effect on the ability of the Company to perform its obligations under
          this Agreement;

               (viii) (A)  to change any of its methods of accounting in effect
          at June 30, 1995, except as may be required to comply with GAAP, (B)
          to make or rescind any election relating to Taxes (other than any
          election which must be made periodically which is made consistent with
          past practice), (C) to settle or compromise any claim, action, suit,
          litigation, proceeding, arbitration, investigation, audit or
          controversy relating to Taxes (except where the cost to the Company
          and its Subsidiaries of such settlements or compromises, individually
          or in the aggregate, does not exceed $250,000) or (D) to change any of
          its methods of reporting income or deductions for federal income tax
          purposes from those employed in the preparation of the federal income
          tax returns for the taxable year ending June 30, 1995, except, in each
          case, as may be required by Law and for matters that could not
          reasonably be expected to have a Material Adverse Effect on the
          Company;

               (ix)   to incur any obligations for borrowed money or purchase
          money indebtedness (other than purchase money indebtedness as to which
          Liens may be granted as permitted by Section 6.02(a)(vi)) that are
          Material to the Company, whether or not evidenced by a note, bond,
          debenture or similar instrument, except drawings under credit lines
          existing at the date of this Agreement or otherwise in the ordinary
          course of business consistent with past practice and in no event
          (including purchase money indebtedness as to which Liens may be
          granted pursuant to Section 6.02(a)(vi)) in excess of $250,000;

               (x)    release any third Person from its obligations under any
          existing standstill agreement relating to a Competing Transaction or
          otherwise under any confidentiality agreement or similar agreement;


                         Agreement and Plan of Merger

                                     -31-
<PAGE>
 
               (xi)   enter into any Material Contract with any third Person
          (other than customers and vendors in the ordinary course of business)
          which provides for an exclusive arrangement with that third Person or
          is substantially more restrictive on the Company or any of its
          Subsidiaries or substantially less advantageous to the Company or any
          of its Subsidiaries than Material Contracts existing on the date
          hereof; or

               (xii)  agree in writing or otherwise to do any of the foregoing;

          (b)  The Acquiror covenants and agrees that, except as expressly
     contemplated by this Agreement or otherwise consented to in writing by the
     Company, from the date of this Agreement until the Effective Time, it will
     not do, and will not permit any of its Subsidiaries to do, any of the
     following:
 
               (i)    to declare or to pay any dividend on, or to make any other
          distribution in respect of, outstanding shares of capital stock,
          except for (A) dividends by a wholly-owned Subsidiary of such party to
          such party or another wholly-owned Subsidiary of such party, (B)
          regular quarterly dividends payable to holders of Acquiror Common
          Stock in the amounts per share and at the approximate times paid
          during calendar year 1995 and (C) dividends paid by partially owned
          subsidiaries declared and paid in the ordinary course of business;

               (ii)   (A)  to redeem, purchase or acquire, or to offer to
          purchase or acquire, any outstanding shares of capital stock of, or
          other equity interests in, or any securities that are convertible into
          or exchangeable for any shares of capital stock of, or other equity
          interests in, or any outstanding options, warrants or rights of any
          kind to acquire any shares of capital stock of, or other equity
          interests in, the Acquiror or any of its Subsidiaries (other than (1)
          any such acquisition by the Acquiror or any of its wholly-owned
          Subsidiaries directly from any wholly-owned Subsidiary of the Acquiror
          in exchange for capital contributions or loans to such Subsidiary, (2)
          any repurchase, forfeiture or retirement of shares of Acquiror Common
          Stock or Acquiror Stock Options occurring pursuant to the terms (as in
          effect on the date of this Agreement) of any existing Benefit Plan of
          the Acquiror or any of its Subsidiaries, (3) any periodic purchase of
          Acquiror Common Stock for allocation to employee's accounts occurring
          pursuant to the terms (as in effect on the date of this Agreement) of
          any existing Benefit Plan of the Acquiror or any of its Subsidiaries
          and (4) any redemption, purchase or acquisition by a Subsidiary that
          could not reasonably be expected to have a Material Adverse Effect on
          the Acquiror) or (B) to effect any reorganization or recapitalization
          other than any reorganization or recapitalization that could not
          reasonably be expected to have a material adverse effect on the
          ability of the Acquiror to perform its obligations under this
          Agreement;


                         Agreement and Plan of Merger

                                     -32-
<PAGE>
 
               (iii)  to offer, sell, issue or grant, or authorize the offering,
          sale, issuance or grant, of any shares of capital stock of, or other
          equity interests in, any securities convertible into or exchangeable
          for any shares of capital stock of, or other equity interests in, or
          any options, warrants or rights of any kind to acquire any shares of
          capital stock of, or other equity interests in, the Acquiror or any of
          its Subsidiaries, other than issuances of Acquiror Common Stock (A)
          upon the exercise of Acquiror Stock Options outstanding at the date of
          this Agreement in accordance with the terms thereof (as in effect on
          the date of this Agreement), (B) upon the expiration of any
          restrictions upon issuance of any grant existing at the date of this
          Agreement of restricted stock or stock bonus pursuant to the terms (as
          in effect on the date of this Agreement) of any Benefit Plans of the
          Acquiror or any of its Subsidiaries, or (C) any periodic issuance of
          shares of Acquiror Common Stock or Acquiror Stock Options pursuant to
          the terms (as in effect on the date of this Agreement) of any Benefit
          Plan of the Acquiror or any of its Subsidiaries or (D) any issuance of
          shares of Acquiror Common Stock for cash or in connection with any
          acquisition of equity interests, assets or businesses and other than
          any such offer, sale, issuance or grant that could not reasonably be
          expected to have a Material Adverse Effect on the Acquiror or a
          material adverse effect on the ability of the Acquiror to perform its
          obligations under this Agreement;

               (iv)   to acquire or agree to acquire, by merging or
          consolidating with, by purchasing an equity interest in or a portion
          of the assets of, or in any other manner, any business or any
          corporation, partnership, association or other business organization
          or division thereof, or otherwise to acquire any assets of any other
          Person (other than the purchase of assets from suppliers or vendors in
          the ordinary course of business and consistent with past practice and
          acquisitions of equity interests, assets and businesses that could not
          reasonably be expected to have a material adverse effect on the
          ability of the Acquiror to perform its obligations under this
          Agreement);

               (v)    to sell, lease, exchange or otherwise dispose of, or to
          grant any Lien (other than a Permitted Encumbrance) with respect to,
          any of the assets of the Acquiror or any of its Subsidiaries that are
          Material to the Acquiror, except for dispositions of assets and
          inventories in the ordinary course of business and consistent with
          past practice and dispositions of assets and incurrences of Liens that
          could not reasonably be expected to have a material adverse effect on
          the ability of the Acquiror to perform its obligations under this
          Agreement;

               (vi)   to adopt any amendments to its charter or bylaws or other
          organizational documents that would alter the terms of the Acquiror's
          Common Stock or could reasonably be expected to have a material
          adverse effect on the ability of the Acquiror or Newco to perform its
          obligations under this Agreement;


                         Agreement and Plan of Merger

                                     -33-
<PAGE>
 
               (vii)  to incur any obligations for borrowed money or purchase
          money indebtedness (other than purchase money indebtedness as to which
          Liens may be granted as permitted by Section 6.02(b)(vi)) that are
          Material to the Acquiror, whether or not evidenced by a note, bond,
          debenture or similar instrument, except drawings under credit lines
          existing at the date of this Agreement, obligations incurred in the
          ordinary course of business consistent with past practice and
          obligations that could not reasonably be expected to have a material
          adverse effect on the ability of the Acquiror to perform its
          obligations under this Agreement;

               (viii) agree in writing or otherwise to do any of the foregoing;

     SECTION 6.3    No Solicitation.  From the date of this Agreement until the
                    ---------------                                            
Effective Time or the termination of this Agreement pursuant to Section 9.01,
the Company agrees that it will not initiate, solicit or knowingly encourage
(including by way of furnishing nonpublic information or assistance), or take
any other action knowingly to facilitate, any inquiries or the making of any
proposal that constitutes, or may reasonably be expected to lead to, any
Competing Transaction, or enter into discussions or negotiate with any Person in
furtherance of such inquiries or to obtain a Competing Transaction, or agree to
or endorse any Competing Transaction, or authorize or permit any of the
officers, directors or employees of the Company or any of its Subsidiaries or
any investment banker, financial advisor, attorney, accountant or other
representative retained by the Company or any of the Company's Subsidiaries to
take any such action and, to the extent permitted by contracts existing at the
date of this Agreement, the Company shall promptly notify the Acquiror of any
such inquiries and proposals received by the Company or any of its Subsidiaries
or by any such officer, director, investment banker, financial advisor or
attorney, relating to any of such matters; provided, however, that (i) nothing
contained in this Section 6.03 shall prohibit the Board of Directors of the
Company from (A) furnishing information to, or entering into discussions or
negotiations with, any Persons in connection with an unsolicited bona fide
proposal in writing by such Person to acquire the Company pursuant to a merger,
consolidation, share exchange, business combination or other similar transaction
or to acquire a substantial portion of the assets of the Company or any of its
Significant Subsidiaries, if, and only to the extent that (1) the Board of
Directors of the Company, after considering the advice of outside legal counsel
to the Company, determines in good faith that such action is required for the
Board of Directors of the Company to comply with its fiduciary duties to
stockholders imposed by Law and (2) prior to furnishing such information to, or
entering into discussions or negotiations with, such Person the Company provides
written notice to the Acquiror to the effect that it is furnishing information
to, or entering into discussions or negotiations with, such Person; or (B)
complying with Rule 14e-2 promulgated under the Exchange Act with regard to a
Competing Transaction and (ii) taking the actions contemplated by (i) above
under the circumstances described therein will not be deemed to be a breach of
this Agreement.


                         Agreement and Plan of Merger

                                     -34-
<PAGE>
 
     SECTION 6.4    Access and Information.
                    ---------------------- 

          (a)  Each of the parties shall, and shall cause its Subsidiaries to,
     (i) afford to the other party and its officers, directors, employees,
     accountants, consultants, legal counsel, agents and other representatives
     (collectively, the "Representatives") reasonable access at reasonable times
     upon reasonable prior notice to the officers, employees, agents,
     properties, offices and other facilities of such party  and its
     Subsidiaries and to their books and records and (ii) furnish promptly to
     the other party and its Representatives such information concerning the
     business, properties, contracts, records and personnel of such party and
     its Subsidiaries (including financial, operating and other data and
     information) as may be reasonably requested, from time to time, by or on
     behalf of the other party.

          (b)  If this Agreement is terminated for any reason pursuant to
     Article IX hereof, a party that has received information in accordance with
     Section 6.04(a), within ten days after request therefor from the other
     party, shall return or destroy (and provide the other party within such 
     ten-day time period with a certificate of an executive officer certifying
     such destruction) all of the information furnished to it and its
     Representatives pursuant to the provisions of Section 6.04(a) and all
     internal memoranda, analyses, evaluations and other similar material
     containing or reflecting any such information, in each case other than
     information available to the general public without restriction.

     SECTION 6.5    Confidentiality Agreement.  The parties shall comply with,
                    -------------------------                                 
and shall cause their respective Representatives to comply with, all of their
respective obligations under the Confidentiality Agreement.

                                  ARTICLE VII

                             ADDITIONAL AGREEMENTS

     SECTION 7.1    Meeting of Stockholders.  The Company shall, promptly after
                    -----------------------                                    
the date of this Agreement, take all actions necessary in accordance with the
GCL and its certificate of incorporation and bylaws to convene a special meeting
of the Company's stockholders to consider approval and adoption of this
Agreement and the Merger (the "Company Stockholders' Meeting"), and the Company
shall consult with the Acquiror in connection therewith.  The Company shall use
all reasonable efforts to solicit from stockholders of the Company proxies in
favor of the approval and adoption of this Agreement and the Merger and to
secure the vote or consent of stockholders required by the GCL and its
certificate of incorporation and bylaws to approve and adopt this Agreement and
the Merger.


                         Agreement and Plan of Merger

                                     -35-
<PAGE>
 
     SECTION 7.2    Registration Statement; Proxy Statements.
                    ---------------------------------------- 

          (a)  As promptly as practicable after the execution of this Agreement,
     the Acquiror Companies shall prepare and file with the Commission a
     registration statement on Form S-4 (such registration statement, together
     with any amendments thereof or supplements thereto, being the "Registration
     Statement"), containing a proxy statement/prospectus for stockholders of
     the Company (the "Company Proxy Statement/Prospectus"), in connection with
     the registration under the Securities Act of the offering, sale and
     delivery of Acquiror Common Stock to be issued in the Merger pursuant to
     this Agreement. As promptly as practicable after the execution of this
     Agreement, the Company shall prepare and file with the Commission a proxy
     statement that will be the same as the Company Proxy Statement/Prospectus,
     and a form of proxy, in connection with the vote of the Company's
     stockholders with respect to the Merger (such Company Proxy
     Statement/Prospectus, together with any amendments thereof or supplements
     thereto, in each case in the form or forms mailed to the Company's
     stockholders, being the "Company Proxy Statement"). Each of the Acquiror
     Companies and the Company will use all reasonable efforts to have or cause
     the Registration Statement to become effective as promptly as practicable,
     and shall take any action required to be taken under any applicable federal
     or state securities Laws in connection with the issuance of shares of
     Acquiror Common Stock in the Merger. Each of the Acquiror Companies and the
     Company shall furnish all information concerning it and the holders of its
     capital stock as the other may reasonably request in connection with such
     actions. As promptly as practicable after the Registration Statement shall
     have become effective, the Company shall mail the Company Proxy Statement
     to its stockholders entitled to notice of and to vote at the Company
     Stockholders' Meeting. The Company Proxy Statement shall, subject to the
     exercise, in good faith and with due care, by the Company's Board of
     Directors of its fiduciary duty to the stockholders of the Company, include
     the recommendation of the Company's Board of Directors in favor of the
     Merger.

          (b)  The information supplied by the Company for inclusion in the
     Registration Statement shall not, at the time the Registration Statement is
     declared effective, contain any untrue statement of a material fact or omit
     to state any material fact required to be stated therein or necessary in
     order to make the statements therein not misleading. The information
     supplied by the Company for inclusion in (i) the Company Proxy Statement to
     be sent to the stockholders of the Company in connection with the Company
     Stockholders' Meeting shall not, at the date the Company Proxy Statement
     (or any supplement thereto) is first mailed to stockholders, at the time of
     the Company Stockholders' Meeting or at the Effective Time, contain any
     untrue statement of a material fact or omit to state any material fact
     required to be stated therein or necessary in order to make the statements
     therein, in the light of the circumstances under which they were made, not
     misleading. If at any time prior to the Effective Time any event or
     circumstance relating to the Company or any of its Affiliates, or its or
     their respective officers or directors, should be discovered by the Company
     that should be set forth in an amendment to the Registration Statement or a
     supplement to the Company Proxy


                         Agreement and Plan of Merger

                                     -36-
<PAGE>
 
     Statement, the Company shall promptly inform the Acquiror, and the Company
     shall undertake to amend or supplement the Company Proxy Statement
     accordingly. All documents that the Company is responsible for filing with
     the Commission in connection with the transactions contemplated herein
     shall comply as of the time of filing as to form in all material respects
     with the applicable requirements of the Securities Act and the Regulations
     thereunder and the Exchange Act and the Regulations thereunder.

          (c)  The information supplied by the Acquiror Companies for inclusion
     in the Registration Statement shall not, at the time the Registration
     Statement is declared effective, contain any untrue statement of a material
     fact or omit to state any material fact required to be stated therein or
     necessary in order to make the statements therein not misleading. The
     information supplied by the Acquiror Companies for inclusion in the Company
     Proxy Statement to be sent to the stockholders of the Company in connection
     with the Company Stockholders' Meeting shall not, at the date the Company
     Proxy Statement (or any supplement thereto) is first mailed to
     stockholders, at the time of the Company Stockholders' Meeting or at the
     Effective Time, contain any untrue statement of a material fact or omit to
     state any material fact required to be stated therein or necessary in order
     to make the statements therein, in the light of the circumstances under
     which they are made, not misleading. If at any time prior to the Effective
     Time any event or circumstance relating to the Acquiror or any of its
     Affiliates, or to their respective officers or directors, should be
     discovered by the Acquiror that should be set forth in an amendment to the
     Registration Statement or a supplement to the Company Proxy Statement, the
     Acquiror shall promptly inform the Company, and the Acquiror shall
     undertake to amend or supplement the Registration Statement or the
     prospectus contained therein accordingly. All documents that the Acquiror
     Companies are responsible for filing with the Commission in connection with
     the transactions contemplated hereby shall as of the time of filing comply
     as to form in all material respects with the applicable requirements of the
     Securities Act and the Regulations thereunder and the Exchange Act and the
     Regulations thereunder.

          (d)  No amendment or supplement to the Registration Statement or the
     Company Proxy Statement will be made by the Acquiror or the Company without
     the approval of the other party. The Acquiror and the Company each will
     advise the other, promptly after it receives notice thereof, of the time
     when the Registration Statement has become effective or any supplement or
     amendment has been filed, the issuance of any stop order suspending the
     effectiveness of the Registration Statement or the solicitation of proxies
     pursuant to the Company Proxy Statement, the suspension of the
     qualification of the Acquiror Common Stock issuable in connection with the
     Merger for offering or sale in any jurisdiction, any request by the staff
     of the Commission for amendment of the Registration Statement or the
     Company Proxy Statement, the receipt from the staff of the Commission of
     comments thereon or any request by the staff of the Commission for
     additional information with respect thereto.


                         Agreement and Plan of Merger

                                     -37-
<PAGE>
 
     SECTION 7.3    Appropriate Action; Consents; Filings.
                    ------------------------------------- 

          (a)  The Company and the Acquiror shall each use all reasonable
     efforts (i) to take, or to cause to be taken, all appropriate action, and
     to do, or to cause to be done, all things necessary, proper or advisable
     under applicable Law or otherwise to consummate and make effective the
     transactions contemplated by this Agreement, (ii) to obtain from any
     Governmental Authorities any Permits or Orders required to be obtained or
     made by the Acquiror or the Company or any of their Subsidiaries in
     connection with the authorization, execution, delivery and performance of
     this Agreement and the consummation of the transactions contemplated
     hereby, including the Merger, (iii) to make all necessary filings, and
     thereafter make any other required submissions, with respect to this
     Agreement and the Merger required under (A) the Securities Act (in the case
     of Acquiror) and the Exchange Act and the Regulations thereunder, and any
     other applicable federal or state securities Laws, (B) the HSR Act and (C)
     any other applicable Law; provided that the Acquiror and the Company shall
     cooperate with each other in connection with the making of all such
     filings, including providing copies of all such documents to the nonfiling
     party and its advisors prior to filings and, if requested, shall accept all
     reasonable additions, deletions or changes suggested in connection
     therewith. The Company and the Acquiror shall furnish all information
     required for any application or other filing to be made pursuant to any
     applicable Law or any applicable Regulations of any Governmental Authority
     (including all information required to be included in the Company Proxy
     Statement or the Registration Statement) in connection with the
     transactions contemplated by this Agreement.

          (b)  Each of the Company and the Acquiror shall give prompt notice to
     the other of (i) any notice or other communication from any Person alleging
     that the consent of such Person is or may be required in connection with
     the Merger, (ii) any notice or other communication from any Governmental
     Authority in connection with the Merger, (iii) any actions, suits, claims,
     investigations or proceedings commenced or threatened in writing against,
     relating to or involving or otherwise affecting the Company, the Acquiror
     or their Subsidiaries that relate to the consummation of the Merger; (iv)
     the occurrence of a default or event that, with notice or lapse of time or
     both, will become a default under any Material Contract of the Acquiror or
     Material Contract of the Company; and (v) any change that is reasonably
     likely to have a Material Adverse Effect on the Company or the Acquiror or
     is likely to delay or impede the ability of either the Acquiror or the
     Company to consummate the transactions contemplated by this Agreement or to
     fulfill their respective obligations set forth herein.

          (c)  The Acquiror Companies and the Company agree to cooperate and use
     all reasonable efforts vigorously to contest and resist any action,
     including legislative, administrative or judicial action, and to have
     vacated, lifted, reversed or overturned any Order (whether temporary,
     preliminary or permanent) of any Court or Governmental Authority that is in
     effect and that restricts, prevents or prohibits the consummation of the
     Merger or any other transactions contemplated by this Agreement, including
     the vigorous


                         Agreement and Plan of Merger

                                     -38-
<PAGE>
 
     pursuit of all available avenues of administrative and judicial appeal and
     all available legislative action.  Each of the Acquiror Companies and the
     Company also agree to take any and all actions, including the disposition
     of assets or the withdrawal from doing business in particular
     jurisdictions, required by any Court or Governmental Authority as a
     condition to the granting of any Permit or Order necessary for the
     consummation of the Merger or as may be required to avoid, lift, vacate or
     reverse any legislative or judicial action which would otherwise cause any
     condition to Closing not to be satisfied; provided, however, that in no
     event shall either party take, or be required to take, any action that
     could reasonably be expected to have an Material Adverse Effect on the
     Acquiror or the Company.

               (d)  (i)  Each of the Company and Acquiror shall give (or shall
          cause their respective Subsidiaries to give) any notices to third
          Persons, and use, and cause their respective Subsidiaries to use, all
          reasonable efforts to obtain any consents from third Persons (A)
          necessary, proper or advisable to consummate the transactions
          contemplated by this Agreement, (B) otherwise required under any
          contracts, licenses, leases or other agreements in connection with the
          consummation of the transactions contemplated hereby or (C) required
          to prevent a Material Adverse Effect on the Company from occurring
          prior to or after the Effective Time or a Material Adverse Effect on
          the Acquiror from occurring after the Effective Time.

               (ii)  If any party shall fail to obtain any consent from a third
          Person described in subsection (d)(i) above, such party shall use all
          reasonable efforts, and shall take any such actions reasonably
          requested by the other parties, to limit the adverse effect upon the
          Company and Acquiror, their respective Subsidiaries, and their
          respective businesses resulting, or which could reasonably be expected
          to result after the Effective Time, from the failure to obtain such
          consent.

     SECTION 7.4    Affiliates; Pooling; Tax Treatment.
                    ---------------------------------- 

          (a)  The Company shall use all reasonable efforts to obtain an
     executed letter agreement substantially in the form of Annex B hereto from
     (i) each Person identified in Section 4.19 of the Company's Disclosure
     Letter within 15 days following the execution and delivery of this
     Agreement and (ii) from any Person who may be deemed to have become an
     Affiliate of the Company after the date of this Agreement and prior to the
     Effective Time as soon as practicable after attaining such status.

          (b)  The Acquiror shall use all reasonable efforts to obtain an
     executed letter agreement substantially in the form of Annex C hereto from
     (i) each Person identified in Section 5.17 of the Acquiror's Disclosure
     Letter within 15 days following the execution and delivery of this
     Agreement and (ii) from any Person who may be deemed to have become an
     Affiliate of the Acquiror after the date of this Agreement and prior to the
     Effective Time as soon as practicable after attaining such status.


                         Agreement and Plan of Merger

                                     -39-
<PAGE>
 
          (c)  The Acquiror Companies shall not be required to maintain the
     effectiveness of the Registration Statement for the purpose of resale by
     stockholders of the Company who may be Affiliates of the Company pursuant
     to Rule 145 under the Securities Act.

          (d)  Each party hereto shall use all reasonable efforts to cause the
     Merger to be treated for financial accounting purposes as a Pooling
     Transaction, and shall not take, and shall use all reasonable efforts to
     prevent any Affiliate of such party from taking, any actions which could
     prevent the Merger from being treated for financial accounting purposes as
     a Pooling Transaction.

          (e)  Each party hereto shall use all reasonable efforts to cause the
     Merger to qualify, and shall not take, and shall use all reasonable efforts
     to prevent any Affiliate of such party from taking, any actions which could
     prevent the Merger from qualifying, as a reorganization under the
     provisions of Section 368(a) of the Code.

     SECTION 7.5    Public Announcements.  The Acquiror and the Company shall
                    --------------------                                     
consult with each other before issuing any press release or otherwise making any
public statements with respect to the Merger and shall not issue any such press
release or make any such public statement prior to such consultation.

     SECTION 7.6    NYSE Listing.  The Acquiror shall use all reasonable efforts
                    ------------                                                
to cause the shares of Acquiror Common Stock to be issued in the Merger to be
approved for listing (subject to official notice of issuance) on the NYSE prior
to the Effective Time. To the Knowledge of the Acquiror, there are no facts and
circumstances that could reasonably be expected to preclude the Acquiror Common
Stock to be issued in the Merger from being approved for listing on the NYSE.

     SECTION 7.7    Rights Agreement; State Takeover Statutes.  The Company
                    -----------------------------------------              
shall take all action (including, if necessary, redeeming all of the outstanding
rights issued pursuant to the Company Rights Agreement or amending or
terminating the Rights Agreement) so that the execution, delivery and
performance of this Agreement and the consummation of the Merger and the other
transactions contemplated hereby do not and will not result in the grant of any
rights to any Person under the Rights Agreement or enable or require any
outstanding rights to be exercised, distributed or triggered. The Company will
take all steps necessary to exempt the transactions contemplated by this
Agreement from Section 203 of the GCL.

     SECTION 7.8    Comfort Letters.
                    --------------- 

          (a)  The Company shall use all reasonable efforts to cause Price
     Waterhouse LLP to deliver a letter dated as of the date of the Company
     Proxy Statement, and addressed to the Company and the Acquiror, in form and
     substance reasonably satisfactory to Acquiror and customary in scope and
     substance for agreed upon procedures letters delivered by independent
     public accountants in connection with registration


                         Agreement and Plan of Merger

                                     -40-
<PAGE>
 
     statements and proxy statements similar to the Registration Statement and
     the Company Proxy Statement.

          (b)  The Acquiror shall use all reasonable efforts to cause Arthur
     Andersen LLP to deliver a letter dated as of the date of the Company Proxy
     Statement, and addressed to the Acquiror and the Company, in form and
     substance reasonably satisfactory to the Company and customary in scope and
     substance for agreed upon procedures letters delivered by independent
     public accountants in connection with registration statements and proxy
     statements similar to the Registration Statement and the Company Proxy
     Statement.

     SECTION 7.9    Assumption of Obligations to Issue Stock.
                    ---------------------------------------- 

          (a)  At the Effective Time, automatically and without any action on
     the part of the holder thereof, each outstanding Company Stock Option shall
     be assumed by the Surviving Corporation and become an option to purchase
     that number of shares of Acquiror Common Stock obtained by multiplying the
     number of shares of Company Common Stock issuable upon the exercise of such
     option by the Common Stock Exchange Ratio at an exercise price per share
     equal to the per share exercise price of such option divided by the Common
     Stock Exchange Ratio and otherwise upon the same terms and conditions as
     such outstanding options to purchase Company Common Stock; provided,
     however, that in the case of any option to which Section 421 of the
     Internal Revenue Code applies by reason of the qualifications under Section
     422 or 423 of such Code, the exercise price, the number of shares
     purchasable pursuant to such option and the terms and conditions of
     exercise of such option shall be determined in a manner that complies with
     Section 424(a) of the Code.

          (b)  On or prior to the Effective Time, the Company shall take or
     cause to be taken all such actions, reasonably satisfactory to the
     Acquiror, as may be necessary or desirable in order to authorize the
     transactions contemplated by subsection (a) of this Section.

          (c)  The Acquiror shall take all corporate actions necessary to
     reserve for issuance a sufficient number of shares of Acquiror Common Stock
     for delivery upon exercise of the Company Stock Options assumed by Acquiror
     pursuant to Section 7.09(a) above.

          (d)  As promptly as practicable after the Effective Time, the Acquiror
     shall file one or more Registration Statements on Form S-8 (or any
     successor or other appropriate forms) with respect to the shares of
     Acquiror Common Stock subject to the Company Stock Options and shall use
     its reasonable efforts to maintain the effectiveness of such registration
     statement or registration statements (and maintain the current status of
     the prospectus or prospectuses contained therein) for so long as such
     options remain outstanding and to comply with applicable state securities
     and blue sky laws.


                         Agreement and Plan of Merger

                                     -41-
<PAGE>
 
          (e)  Except as provided herein or as otherwise agreed to by the
     parties, each of the Company Stock Option Plans providing for the issuance
     or grant of Company Stock Options shall be assumed as of the Effective Time
     by the Surviving Corporation with such amendments thereto as may be
     required to reflect the Merger.

     SECTION 7.10   Employee Benefit Plans.  Provided that the Company shall not
                    ----------------------                                      
be obligated with respect to any action taken by the Company or its Subsidiaries
with respect to the Employee Benefit Plans of the Company or its Subsidiaries in
violation of the provisions of Section 6.02(a), the Acquiror hereby agrees to
guarantee and to cause the Surviving Corporation and each Subsidiary of the
Surviving Corporation to honor and perform all obligations of the Surviving
Corporation and each Subsidiary of the Surviving Corporation under all Benefit
Plans of the Company and such Subsidiaries and all employment contracts of the
Company listed on Section 4.10 of the Company's Disclosure Letter, including,
except as amended by the Employment Agreement, the Change in Control Agreements
and the Restricted Stock Agreement, including the provisions of the Change in
Control Agreements and the Restricted Stock Agreement that provide for the
acceleration of vesting schedules applicable to stock options and restricted
stock awards granted thereunder upon the Effective Time (other than the Company
Option Plans, the Company Stock Options granted thereunder (other than those
granted and outstanding on the date of this Agreement) and incentive
compensation plans of the Company and its Subsidiaries). The Acquiror shall
cause the Surviving Corporation to maintain through December 31, 1997 (the
"Benefit Continuation Period"), the Benefit Plans of the Company and its
- ----------------------------                                            
Subsidiaries set forth in Section 4.13(a) of the Company's Disclosure Letter,
substantially as in effect immediately prior to the Effective Time (other than
the Company Option Plans, the Company Stock Options granted thereunder (other
than those granted and outstanding on the date of this Agreement) and incentive
compensation plans of the Company and its Subsidiaries). From and after the
Effective Time, including after the Benefit Continuation Period, the Acquiror
shall grant all employees of the Company and its Subsidiaries on the Closing
Date credit for all service (to the same extent as service with the Acquiror or
any Subsidiary of the Acquiror is taken into account with respect to similarly
situated employees of the Acquiror and the Subsidiaries of the Acquiror) with
the Company and any Subsidiary of the Company and their respective predecessors
prior to the Effective Time under all Benefit Plans of the Acquiror or its
Subsidiaries in which such employees shall become eligible to participate as if
such service with the Company or any Subsidiary of the Company was service with
the Acquiror or any Subsidiary of the Acquiror, and, with respect to any medical
or dental benefit plan in which such employees become eligible to participate,
the Acquiror shall waive any pre-existing condition exclusions and actively-at-
work requirements (provided, however, that no such waiver shall apply to a pre-
existing condition of any employee of the Company or any Subsidiary of the
Company who was, as of the Effective Time, excluded from participation in a
Benefit Plan by virtue of such pre-existing condition) and provided that any
covered expenses incurred on or before the Effective Time by an employee or an
employee's covered dependent shall be taken into account for purposes of
satisfying applicable deductible, coinsurance and maximum out-of-pocket
provisions after the Effective Time to the same extent as such expenses are
taken into account for the benefit of similarly situated employees of the
Acquiror and the Subsidiaries of the Acquiror.


                         Agreement and Plan of Merger

                                     -42-
<PAGE>
 
     SECTION 7.11   Indemnification of Directors and Officers.
                    ----------------------------------------- 

          (a)  Until six years from the Effective Time, the certificate of
     incorporation and bylaws of the Surviving Corporation as in effect
     immediately after the Effective Time shall not be amended to reduce or
     limit the rights of indemnity afforded to the present and former directors
     and officers of the Company thereunder or as to the ability of the Company
     to indemnify such Persons, or to hinder, delay or make more difficult the
     exercise of such rights of indemnity or the ability to indemnify. The
     Surviving Corporation will at all times exercise the powers granted to it
     by its certificate of incorporation, its bylaws and applicable law to
     indemnify to the fullest extent possible the present and former directors,
     officers, employees and agents of the Company against claims made against
     them arising from their service in such capacities prior to the Effective
     Time.
 
          (b)  If any claim or claims shall, subsequent to the Effective Time
     and within six years thereafter, be made against any present or former
     director, officer, employee or agent of the Company based on or arising out
     of the services of such Person prior to the Effective Time in the capacity
     of such Person as a director, officer, employee or agent of the Company,
     the provisions of this subsection (a) of this Section respecting the
     certificate of incorporation and bylaws of the Surviving Corporation shall
     continue in effect until the final disposition of all such claims.

          (c)  The Acquiror hereby agrees after the Effective Time to guarantee
     the payment of the Surviving Corporation's indemnification obligations
     described in Section 7.11(a) up to an amount determined as of the Effective
     Time equal to (i) the fair market value of any assets of the Surviving
     Corporation or any of its Subsidiaries distributed to the Acquiror or any
     of its Subsidiaries (other than the Surviving Corporation and its
     Subsidiaries), minus (ii) any liabilities of the Surviving Corporation or
     any of its Subsidiaries assumed by the Acquiror or any of its Subsidiaries
     (other than the Surviving Corporation and its Subsidiaries), minus (iii)
     the fair market value of any assets of the Acquiror or any of its
     Subsidiaries (other than the Surviving Corporation and its Subsidiaries)
     contributed to the Surviving Corporation or any of its Subsidiaries and
     plus (iv) any liabilities of the Acquiror or any of its Subsidiaries (other
     than the Surviving Corporation and its Subsidiaries) assumed by the
     Surviving Corporation or any of its Subsidiaries.

          (d)  Notwithstanding subsection (a), (b) or (c) of this Section 7.11,
     the Acquiror and the Surviving Corporation shall be released from the
     obligations imposed by such subsection if the Acquiror shall assume the
     obligations of the Surviving Corporation thereunder by operation of Law or
     otherwise. Notwithstanding anything to the contrary in this Section 7.11,
     neither the Acquiror nor the Surviving Corporation shall be liable for any
     settlement effected without its written consent, which shall not be
     unreasonably withheld.

          (e)  The Acquiror shall cause to be maintained in effect until six
     years from the Effective Time the current policies of directors' and
     officers' liability insurance


                         Agreement and Plan of Merger

                                     -43-
<PAGE>
 
     maintained by the Company (or substitute policies providing at least the
     same coverage and limits and containing terms and conditions that are not
     materially less advantageous) with respect to claims arising from facts or
     events which occurred before the Effective Time; provided, however, that in
     no event shall the Acquiror or the Surviving Corporation be required to
     expend more than 200 percent of the current annual premiums paid by the
     Company for such insurance; provided, further, that, if the Acquiror or the
     Surviving Corporation is unable to obtain insurance for any period for 200
     percent of the current annual premiums, then the obligation of the Acquiror
     and the Surviving Corporation pursuant hereto shall be to obtain the best
     coverage reasonably available under the circumstances subject to the
     foregoing limitations on premiums.

          (f)  The provisions of this Section 7.11 are intended to be for the
     benefit of, and shall be enforceable by, each Person entitled to
     indemnification hereunder and the heirs and representatives of such Person.

          (g)  The Acquiror shall not permit the Surviving Corporation to merge
     or consolidate with any other Person unless the Surviving Corporation shall
     ensure that the surviving or resulting entity assumes the obligations
     imposed by subsections (a), (b), (c) and (e) of this Section.

     SECTION 7.12   Newco.  Prior to the Effective Time, Newco shall not conduct
                    -----                                                       
any business or make any investments other than as specifically contemplated by
this Agreement and will not have any assets (other than the minimum amount of
cash required to be paid to Newco for the valid issuance of its stock to the
Acquiror). The Acquiror shall take all action necessary to cause Newco to
perform its obligations under this Agreement and to consummate the Merger on the
terms and conditions set forth in this Agreement.

     SECTION 7.13   Event Notices.  From and after the date of this Agreement
                    -------------                                            
until the Effective Time, each party hereto shall promptly notify the other
party hereto of (i) the occurrence or nonoccurrence of any event the occurrence
or nonoccurrence of which would be likely to cause any condition to the
obligations of such party to effect the Merger and the other transactions
contemplated by this Agreement not to be satisfied and (ii) the failure of such
party to comply with any covenant or agreement to be complied with by it
pursuant to this Agreement which would be likely to result in any condition to
the obligations of such party to effect the Merger and the other transactions
contemplated by this Agreement not to be satisfied. No delivery of any notice
pursuant to this Section 7.13 shall cure any breach of any representation or
warranty of such party contained in this Agreement or otherwise limit or affect
the remedies available hereunder to the party receiving such notice.

     SECTION 7.14   Stratworks Divestiture.  The Company shall divest itself on
                    ----------------------                                     
or prior to the Closing Date of any ownership interest in the software
application called "Stratworks" through the sale thereof to a Person
unaffiliated with either the Company or the Acquiror on terms reasonably
satisfactory to the Acquiror.

     SECTION 7.15   Change in Control Agreements.  Prior to the Effective Time,
                    ----------------------------                               
the Company shall agree, and shall use all reasonable efforts to cause each
Person who is a party to


                         Agreement and Plan of Merger

                                     -44-
<PAGE>
 
one of the Change in Control Agreements to agree, in writing that (a) for all
purposes of such Change in Control Agreements, Newco shall be substituted for
the Company as the successor to the Company, except that, for purposes of each
of the Change in Control Agreements, a "Change in Control" shall be deemed to
have occurred as a result of the Merger, (b) no payments will be required
pursuant to Section 5 of any of the Change in Control Agreements solely as a
result of the Merger and (c) Section 4(b)(ii)(A) of each of the Change in
Control Agreements will be amended and restated to read in its entirety as
follows: "Failure to elect or reelect the Executive to the office of the Company
which the Executive held immediately prior to a Change in Control;". Such
agreements shall be reasonably satisfactory in form and substance to the
Acquiror.

                                 ARTICLE VIII

                              CLOSING CONDITIONS

     SECTION 8.1    Conditions to Obligations of Each Party Under This
                    --------------------------------------------------
Agreement. The respective obligations of each party to effect the Merger and the
other transactions contemplated hereby shall be subject to the satisfaction at
or prior to the Effective Time of the following conditions, any or all of which
may be waived by the parties hereto, in whole or in part, to the extent
permitted by applicable Law:

          (a)  Effectiveness of the Registration Statement.  The Registration
               -------------------------------------------                   
     Statement shall have been declared effective by the Commission under the
     Securities Act. No stop order suspending the effectiveness of the
     Registration Statement shall have been issued by the Commission and no
     proceedings for that purpose shall have been initiated by the Commission.

          (b)  Stockholder Approval.  This Agreement and the Merger shall have
               --------------------                                           
     been approved and adopted by the requisite vote of the stockholders of the
     Company as required by the GCL.

          (c)  No Order.  No Court or Governmental Authority shall have enacted,
               --------                                                         
     issued, promulgated, enforced or entered any Law, Regulation or Order
     (whether temporary, preliminary or permanent) which is in effect and which
     has the effect of making the Merger illegal or otherwise prohibiting
     consummation of the Merger.

          (d)  HSR Act.  The applicable waiting period under the HSR Act shall
               -------                                                        
     have expired or been terminated.

          (e)  Foreign Governmental Authorities.  The applicable waiting period
               ---------------------------------                               
     under any competition Laws, Regulations and Orders of foreign Governmental
     Authorities, as set forth in the Acquiror's Disclosure Letter and the
     Company's Disclosure Letter, shall have expired or been terminated.

          (f)  Pooling of Interests.  The Acquiror and the Company shall have
               --------------------                                          
     been advised in writing by Arthur Andersen LLP as of the date upon which
     the Effective Time


                         Agreement and Plan of Merger

                                     -45-
<PAGE>
 
     is to occur to the effect that such firm knows of no reason why the Merger
     cannot be treated for financial accounting purposes as a pooling of
     interests.

     SECTION 8.2    Additional Conditions to Obligations of the Acquiror
                    ----------------------------------------------------
Companies.  The obligations of the Acquiror Companies to effect the Merger and
- ---------                                                                     
the other transactions contemplated hereby shall be subject to the satisfaction
at or prior to the Effective Time of the following conditions, any or all of
which may be waived by the Acquiror Companies, in whole or in part, to the
extent permitted by applicable Law:

          (a)  Representations and Warranties.  Each of the representations and
               ------------------------------                                  
     warranties of the Company contained in this Agreement shall be true and
     correct in all material respects (without duplication of any materiality
     exception contained in any individual representation and warranty) as of
     the date of this Agreement and as of the Effective Time as though made
     again on and as of the Effective Time.  The Acquiror Companies shall have
     received a certificate of the President and the Chief Financial Officer of
     the Company, dated the date of the Effective Time, to such effect.

          (b)  Agreements and Covenants.  The Company shall have performed or
               ------------------------                                      
     complied with all agreements and covenants required by this Agreement to be
     performed or complied with by it on or prior to the Effective Time.  The
     Acquiror Companies shall have received a certificate of the President and
     the Chief Financial Officer of the Company, dated the date of the Effective
     Time, to such effect.

          (c)  Tax Opinion.  The Acquiror shall have received the opinion dated
               ------------                                                    
     on or prior to the effective date of the Registration Statement of Vinson &
     Elkins LLP to the effect that (i) the Merger will constitute a
     reorganization under section 368(a) of the Code, (ii) the Acquiror, the
     Company and Newco will each be a party to that reorganization, and (iii) no
     gain or loss will be recognized by the Acquiror, the Company or Newco by
     reason of the Merger.

     SECTION 8.3    Additional Conditions to Obligations of the Company.  The
                    ---------------------------------------------------      
obligations of the Company to effect the Merger and the other transactions
contemplated hereby shall be subject to the satisfaction at or prior to the
Effective Time of the following conditions, any or all of which may be waived by
the Company, in whole or in part, to the extent permitted by applicable Law:

          (a)  Representations and Warranties.  Each of the representations and
               ------------------------------                                  
     warranties of the Acquiror Companies contained in this Agreement shall be
     true and correct in all material respects (without duplication of any
     materiality exception contained in any individual representation and
     warranty) as of the date of this Agreement and as of the Effective Time as
     though made again on and as of the Effective Time.  The Company shall have
     received a certificate of the President and the Chief Financial Officer of
     each of the Acquiror Companies, dated the date of the Effective Time, to
     such effect.

          (b)  Agreements and Covenants.  The Acquiror Companies shall have
               ------------------------                                    
     performed or complied with all agreements and covenants required by this
     Agreement to

                         Agreement and Plan of Merger

                                     -46-
<PAGE>
 
     be performed or complied with by them on or prior to the Effective Time.
     The Company shall have received a certificate of the President and the
     Chief Financial Officer of each of the Acquiror Companies, dated the date
     of the Effective Time, to such effect.

          (c)  Tax Opinion.  The Company shall have received the opinion dated
               -----------
     on or prior to the effective date of the Registration Statement of Winstead
     Sechrest & Minick P.C. to the effect that (i) the Merger will constitute a
     reorganization under section 368(a) of the Code, (ii) the Acquiror, the
     Company and Newco will each be a party to that reorganization, and (iii) no
     gain or loss will be recognized by the stockholders of the Company upon the
     receipt of shares of Acquiror Common Stock in exchange for shares of
     Company Common Stock pursuant to the Merger except with respect to any cash
     received in lieu of fractional share interests.

          (d)  Investment Banker's Opinion.  The Company shall have received, on
               ---------------------------                                      
     the date of mailing of the Company Proxy Statement to the holders of
     Company Common Stock, a written opinion from Morgan Stanley & Co.
     Incorporated, dated the date of such mailing, confirming the opinion to
     which reference is made in Section 4.21.

          (e)  NYSE Listing.  The shares of Acquiror Common Stock to be issued
               ------------                                                   
     pursuant to the Merger shall have been approved for listing, subject to
     official notice of issuance, on the NYSE.

                                  ARTICLE IX

                       TERMINATION, AMENDMENT AND WAIVER

     SECTION 9.1    Termination.  This Agreement may be terminated at any time
                    -----------                                               
prior to the Effective Time, whether before or after approval of this Agreement
and the Merger by the stockholders of the Company:

          (a)  by mutual consent of the Acquiror and the Company;

          (b)  by the Acquiror, upon a breach of any covenant or agreement on
     the part of the Company set forth in this Agreement, or if any
     representation or warranty of the Company shall have become untrue, in
     either case such that the conditions set forth in Section 8.02(a) or
     Section 8.02(b) would not be satisfied (a "Terminating Company Breach");
     provided that, if such Terminating Company Breach is curable by the Company
     through the exercise of reasonable efforts and for so long as the Company
     continues to exercise such reasonable efforts, the Acquiror may not
     terminate this Agreement under this Section 9.01(b);

          (c)  by the Company, upon breach of any covenant or agreement on the
     part of the Acquiror Companies set forth in this Agreement, or if any
     representation or warranty of the Acquiror Companies shall have become
     untrue, in either case such that the conditions set forth in Section
     8.03(a) or Section 8.03(b) would not be satisfied (a "Terminating Acquiror
     Breach"); provided that, if such Terminating Acquiror Breach is

                         Agreement and Plan of Merger

                                     -47-
<PAGE>
 
     curable by the Acquiror Companies through the exercise of their reasonable
     efforts and for so long as the Acquiror Companies continue to exercise such
     reasonable efforts, the Company may not terminate this Agreement under this
     Section 9.01(c);

          (d)  by either Acquiror or the Company, if there shall be any Order
     which is final and nonappealable preventing the consummation of the Merger,
     unless the party relying on such Order has not complied with its
     obligations under Section 7.03;

          (e)  by either Acquiror or the Company, if the Merger shall not have
     been consummated before December 31, 1996; provided, however, that this
     Agreement may be extended by written notice of either Acquiror or the
     Company to a date not later than February 28, 1997, if the Merger shall not
     have been consummated as a result of the Company or the Acquiror Companies
     having failed by December 31, 1996 to receive all required Permits and
     Orders with respect to the Merger or as a result of the entering of an
     Order by a Court or Governmental Authority;

          (f)  by either Acquiror or the Company, if this Agreement shall fail
     to receive the requisite vote for approval and adoption by the stockholders
     of the Company at the Company Stockholders' Meeting;

          (g)  by the Acquiror, if (i) the Board of Directors of the Company
     withdraws, modifies or changes its recommendation of this Agreement or the
     Merger in a manner materially adverse to the Acquiror Companies or shall
     have resolved to do any of the foregoing or the Board of Directors of the
     Company shall have recommended to the stockholders of the Company any
     Competing Transaction or resolved to do so; (ii) a tender offer or exchange
     offer for 50 percent or more of the outstanding shares of Company Common
     Stock is commenced and the Board of Directors of the Company, within 10
     Business Days after such tender offer or exchange offer is so commenced,
     either fails to recommend against acceptance of such tender or exchange
     offer by its stockholders or takes no position with respect to the
     acceptance of such tender or exchange offer by its stockholders; or (iii)
     any person shall have acquired beneficial ownership or the right to acquire
     beneficial ownership of, or any "group" (as such term is defined under
     Section 13(d) of the Exchange Act and the Regulations promulgated
     thereunder), shall have been formed which beneficially owns, or has the
     right to acquire beneficial ownership of, 50 percent or more of the then
     outstanding shares of capital stock of the Company; or

          (h)  by the Company, if the Company accepts a Superior Proposal and
     makes the payment required pursuant to Section 9.05(c)(i) of this Agreement
     and pays the expenses for which the Company is responsible under Section
     9.05(a) of this Agreement.

     The right of any party hereto to terminate this Agreement pursuant to this
Section 9.01 shall remain operative and in full force and effect regardless of
any investigation made by or on behalf of any party hereto, any Person
controlling any such party or any of their respective officers, directors,
representatives or agents, whether prior to or after the execution of this
Agreement.

                         Agreement and Plan of Merger

                                     -48-
<PAGE>
 
     SECTION 9.2    Effect of Termination.  Except as provided in Section 9.05
                    ---------------------
or Section 10.01 of this Agreement, in the event of the termination of this
Agreement pursuant to Section 9.01, this Agreement shall forthwith become void,
there shall be no liability on the part of the Acquiror Companies or the Company
or any of their respective officers or directors to the other and all rights and
obligations of any party hereto shall cease, except that nothing herein shall
relieve any party from liability for any breach of this Agreement.

     SECTION 9.3    Amendment.  This Agreement may be amended by the parties
                    ---------                                               
hereto by action taken by or on behalf of their respective Boards of Directors
at any time prior to the Effective Time; provided, however, that, after approval
of the Merger by the stockholders of the Company, no amendment may be made which
would reduce the amount or change the type of consideration into which each
share of Company Common Stock shall be converted pursuant to this Agreement upon
consummation of the Merger.  This Agreement may not be amended except by an
instrument in writing signed by the parties hereto.

     SECTION 9.4    Waiver.  At any time prior to the Effective Time, any party
                    ------                                                     
hereto may (a) extend the time for the performance of any of the obligations or
other acts of the other party hereto, (b) waive any inaccuracies in the
representations and warranties of the other party contained herein or in any
document delivered pursuant hereto and (c) waive compliance by the other party
with any of the agreements or conditions contained herein.  Any such extension
or waiver shall be valid only if set forth in an instrument in writing signed by
the party or parties to be bound thereby.  For purposes of this Section 9.04,
the Acquiror Companies shall be deemed to be one party.

     SECTION 9.5    Fees, Expenses and Other Payments.
                    --------------------------------- 

          (a)  Except as provided in Section 9.05(c) of this Agreement, all
     Expenses incurred by the parties hereto shall be borne solely and entirely
     by the party which has incurred such Expenses; provided, however, that the
     allocable share of the Acquiror Companies as a group and the Company for
     all Expenses related to printing, filing and mailing the Registration
     Statement and the Company Proxy Statement and all Commission and other
     regulatory filing fees incurred in connection with the Registration
     Statement and  the Company Proxy Statement shall be one-half each; and
     provided, further, that the Acquiror may, at its option, pay any Expenses
     of the Company that are solely and directly related to the Merger.
 
               (b)  (i)  The Company agrees that, if (A) either (1) this
          Agreement is terminated pursuant to Section 9.01(f) and, after the
          date of this Agreement and prior to the Company Stockholders' Meeting,
          the Company shall have furnished information to, or entered into
          discussions or negotiations with, any Person with respect to a
          Competing Transaction involving the Company or any of its Subsidiaries
          and the Board of Directors of the Company shall not have reaffirmed
          its favorable recommendation to its stockholders with respect to the
          transactions contemplated by this Agreement by the time of the Company
          Stockholders' Meeting; (2) the Acquiror terminates this Agreement
          pursuant to Section 9.01(g)(i) or 9.01(g)(ii); (3) the Company
          terminates this Agreement pursuant to

                         Agreement and Plan of Merger

                                     -49-
<PAGE>
 
          Section 9.01(h); or (4) within twelve months after the date of the
          termination of this Agreement, any Person or "group" (as such term is
          defined under Section 13(d) of the Exchange Act and the Regulations
          promulgated thereunder), other than the Acquiror, its Subsidiaries or
          Affiliates, shall have acquired beneficial ownership, by tender offer
          or exchange offer or otherwise, of 50 percent or more of the
          outstanding Company Common Stock and (x) the value of the
          consideration per share received by the stockholders of the Company in
          such transaction shall have been higher on a per share basis than the
          consideration payable to the stockholders of the Company under this
          Agreement on a per share basis or (y) such transaction shall be on
          more favorable terms to the stockholders of the Company than the
          Merger; then (B) in each such case the Company shall pay to the
          Acquiror $18 million.

               (ii)   The Company agrees that, if (A) the Acquiror shall
          terminate this Agreement pursuant to Section 9.01(b) and such
          termination is the result of an intentional or willful breach by the
          Company of any agreement, covenant, representation or warranty herein
          and (B) either (1) within twelve months after such termination of this
          Agreement the Company shall have entered into a definitive agreement
          providing for a Business Combination with any Person or "group" (as
          such term is defined under Section 13(d) of the Exchange Act and the
          Regulations promulgated thereunder), other than Acquiror, its
          Subsidiaries or Affiliates, to which the Company shall have furnished
          information or with which the Company shall have had any contacts or
          entered into any discussions or negotiations relating to a Business
          Combination at any time during the period commencing eighteen months
          prior to the date of this Agreement through the date of termination of
          this Agreement and contemplating the payment to the Company or its
          stockholders, as the case may be, of consideration having a higher
          value in the aggregate than the consideration payable to the Company's
          stockholders under this Agreement or such transaction shall be on more
          favorable terms to the stockholders of the Company than the Merger and
          such Business Combination is thereafter consummated or (2) within
          twelve months after such termination of this Agreement, any such
          Person or group shall have acquired beneficial ownership, by tender
          offer or exchange offer or otherwise, of 50 percent or more of the
          outstanding Company Common Stock and as a result the Company's
          stockholders shall have received consideration having a higher value
          per share than the consideration per share payable to the Company's
          stockholders under this Agreement or such transaction shall be on more
          favorable terms to the stockholders of the Company than the Merger,
          then in such case the Company shall pay to the Acquiror $18 million.

               (iii)  For purposes of this Section 9.05(b), the value of the
          consideration received by the Company's stockholders in connection
          with a transaction described in clause (b)(i)(A), (b)(ii)(B)(1) or
          (b)(ii)(B)(2) of this Section 9.05 shall be determined as of the date
          the consideration becomes payable to such stockholders, and the value
          of the consideration payable to such stockholders under this Agreement
          shall be $31.857 per share.

                         Agreement and Plan of Merger

                                     -50-
<PAGE>
 
          (c)  Any payment required to be made pursuant to Section 9.05(b) of
     this Agreement shall be made to the Acquiror not later than two Business
     Days after delivery to the Company of notice of demand for payment, and
     shall be made by wire transfer of immediately available funds to an account
     designated by the Acquiror in the notice of demand for payment delivered
     pursuant to this Section 9.05(c).

                                   ARTICLE X

                              GENERAL PROVISIONS

     SECTION 10.1   Effectiveness of Representations, Warranties and Agreements.
                    ----------------------------------------------------------- 

          (a)  Except as set forth in Section 10.01(b) of this Agreement, the
     representations, warranties and agreements of each party hereto shall
     remain operative and in full force and effect regardless of any
     investigation made by or on behalf of any other party hereto, any Person
     controlling any such party or any of their officers, directors,
     representatives or agents whether prior to or after the execution of this
     Agreement.

          (b)  The representations, warranties and agreements in this Agreement
     shall terminate at the Effective Time or upon the termination of this
     Agreement pursuant to Article IX, except that the agreements set forth in
     Articles II and III and Sections 7.09, 7.10 and 7.11 shall survive the
     Effective Time and those set forth in Sections 6.05, 9.02 and 9.05 and
     Article X hereof shall survive termination.

     SECTION 10.2   Notices.  All notices and other communications given or made
                    -------                                                     
pursuant hereto shall be in writing and shall be deemed to have been duly given
upon receipt, if delivered personally, mailed by registered or certified mail
(postage prepaid, return receipt requested) to the parties at the following
addresses or sent by electronic transmission to the telecopier number specified
below:

          (a)  If to any of the Acquiror Companies, to:

               Halliburton Company
               3600 Lincoln Plaza
               500 North Akard Street
               Dallas, Texas  75201-3391
               Attention:  Lester L. Coleman, Executive Vice President
                              and General Counsel
               Telecopier No.:  (214) 978-2658

                         Agreement and Plan of Merger

                                     -51-
<PAGE>
 
        with a copy to:

             Vinson & Elkins L.L.P.
             First City Tower
             1001 Fannin
             Houston, Texas  77002-6760
             Attention:  William E. Joor III
             Telecopier No.: (713) 758-2346

        (b)  If to the Company, to:

             Landmark Graphics Corporation
             15150 Memorial Drive
             Houston, Texas  77079-4304
             Attention:  Patti Massaro, General Counsel
                             and Corporate Secretary
             Telecopier No.: (713) 560-1383

        with a copy to:

             Winstead Sechrest & Minick P.C.  Shearman & Sterling
             5400 Renaissance Tower           599 Lexington Avenue
             1201 Elm Street                  New York, New York  10022
             Dallas, Texas  75270                 Attention:  David W. Heleniak
             Attention:  Robert E. Crawford, Jr. Telecopier No.: (212) 848-7179
             Telecopier No.:  (214) 745-5390

or to such other address or telecopier number as any party may, from time to
time, designate in a written notice given in a like manner.  Notice given by
telecopier shall be deemed delivered on the day the sender receives telecopier
confirmation that such notice was received at the telecopier number of the
addressee.  Notice given by mail as set out above shall be deemed delivered
three days after the date the same is postmarked.
 
     SECTION 10.3   Headings.  The headings contained in this Agreement are for
                    --------                                                   
reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement.

     SECTION 10.4   Severability.  If any term or other provision of this
                    ------------                                         
Agreement is invalid, illegal or incapable of being enforced by any rule of law
or public policy, all other conditions and provisions of this Agreement shall
nevertheless remain in full force and effect so long as the economic or legal
substance of the transactions contemplated hereby is not affected in any manner
materially adverse to any party.  Upon such determination that any term or other
provision is invalid, illegal or incapable of being enforced, the parties hereto
shall negotiate in good faith to modify this Agreement so as to effect the
original intent of the parties as closely as possible in an acceptable manner to
the end that transactions contemplated hereby are fulfilled to the extent
possible.

                         Agreement and Plan of Merger

                                     -52-
<PAGE>
 
     SECTION 10.5   Entire Agreement.  This Agreement (together with the
                    ----------------
Annexes, the Company's Disclosure Letter, the Acquiror's Disclosure Letter and
the Confidentiality Agreement) constitutes the entire agreement of the parties,
and supersedes all prior agreements and undertakings, both written and oral,
among the parties, with respect to the subject matter hereof.

     SECTION 10.6   Assignment.  This Agreement shall not be assigned by
                    ----------                                          
operation of Law or otherwise.

     SECTION 10.7   Parties in Interest.  This Agreement shall be binding upon
                    -------------------                                       
and inure solely to the benefit of each party hereto, and, other than pursuant
to Sections 7.09, 7.10 and 7.11 hereof, nothing in this Agreement, express or
implied, is intended to or shall confer upon any other Person any right, benefit
or remedy of any nature whatsoever under or by reason of this Agreement.

     SECTION 10.8   Failure or Indulgence Not Waiver;  Remedies Cumulative.  No
                    ------------------------------------------------------     
failure or delay on the part of any party hereto in the exercise of any right
hereunder shall impair such right or be construed to be a waiver of, or
acquiescence in, any breach of any representation, warranty or agreement herein,
nor shall any single or partial exercise of any such right preclude other or
further exercise thereof or of any other right.  All rights and remedies
existing under this Agreement are cumulative to, and not exclusive to, and not
exclusive of, any rights or remedies otherwise available.

     SECTION 10.9   Governing Law.  This Agreement shall be governed by, and
                    -------------                                           
construed in accordance with, the Laws of the State of Texas, regardless of the
Laws that might otherwise govern under applicable principles of conflicts of
law; provided, however, that any matter involving the internal corporate affairs
of any party hereto shall be governed by the provisions of the GCL.

     SECTION 10.10  Counterparts.  This Agreement may be executed in multiple
                    ------------                                             
counterparts, and by the different parties hereto in separate counterparts, each
of which when executed shall be deemed to be an original but all of which taken
together shall constitute one and the same agreement.

                         Agreement and Plan of Merger

                                     -53-
<PAGE>
 
     IN WITNESS WHEREOF, each of the parties hereto has caused this Agreement to
be executed as of the date first written above by their respective officers
thereunto duly authorized.

                                        HALLIBURTON COMPANY



                                        By:_____________________________________
                                           Lester L. Coleman
                                           Executive Vice President and General 
                                           Counsel
 

                                        HALLIBURTON ACQ. COMPANY


                                        By:_____________________________________
                                           Lester L. Coleman
                                           President


                                        LANDMARK GRAPHICS CORPORATION


                                        By:_____________________________________
                                           Robert P. Peebler
                                           President and Chief Executive Officer

                         Agreement and Plan of Merger

                                     -54-
<PAGE>
 
                                                                         ANNEX A


                           SCHEDULE OF DEFINED TERMS

     The following terms when used in the Agreement shall have the meanings set
forth below unless the context shall otherwise require:

     "Acquiror" shall mean Halliburton Company, a Delaware corporation, and its
successors from time to time.

     "Acquiror Common Stock" shall mean the common stock, par value $2.50 per
share, of the Acquiror.

     "Acquiror Companies" shall have the meaning ascribed to such term in the
first paragraph of this Agreement.

     "Acquiror's Audited Consolidated Financial Statements" shall mean the
consolidated balance sheets of the Acquiror and its Subsidiaries as of December
31, 1994 and December 31, 1995 and the related consolidated statements of
operations and cash flows for the fiscal years ended December 31, 1993, 1994 and
1995, together with the notes thereto, all as audited by Arthur Andersen LLP,
independent accountants, under their report with respect thereto dated January
23, 1996 and included in the Acquiror's Annual Report on Form 10-K for the year
ended December 31, 1995 filed with the Commission.

     "Acquiror's Consolidated Balance Sheet" shall mean the consolidated balance
sheet of the  Acquiror as of December 31, 1995 included in the Acquiror's
Audited Consolidated Financial Statements.

     "Acquiror's Consolidated Financial Statements" shall mean the Acquiror's
Audited Consolidated Financial Statements and the Acquiror's Unaudited
Consolidated Financial Statements.

     "Acquiror's Disclosure Letter" shall mean a letter of even date herewith
delivered by the Acquiror to the Company with the execution of the Agreement,
which, among other things, shall identify exceptions to the Acquiror's
representations and warranties contained in Article V by specific section and
subsection references.

     "Acquiror's Unaudited Consolidated Financial Statements" shall mean the
unaudited consolidated balance sheet of the Acquiror and its Subsidiaries as of
March 31, 1996 and the related consolidated statements of operations and cash
flows for the fiscal quarters ended March 31, 1995 and March 31, 1996, together
with the notes thereto, included in the Acquiror's Quarterly Report on Form 10-Q
for the quarter ended March 31, 1996 filed with the Commission.

     "Acquiror's Rights Agreement" shall mean the Second Amended and Restated
Rights Agreement dated December 15, 1995 between Halliburton Company and
Chemical Mellon Shareholder Services LLC, as Rights Agent.
<PAGE>
 
     "Acquiror Option Plan" shall mean the Halliburton Company 1993 Stock and
Long-Term Incentive Plan.

     "Acquiror Stock Options" shall mean stock options granted pursuant to the
Acquiror Option Plan.

     "Affiliate" shall, with respect to any Person, mean any other Person that
controls, is controlled by or is under common control with the former.

     "Agreement" shall mean the Agreement and Plan of Merger made and entered
into as of June 30, 1996 among Acquiror, Newco and the Company, including any
amendments thereto and each Annex (including this Annex A) and Schedule thereto
(including the Acquiror's Disclosure Letter and the Company's Disclosure
Letter).

     "Benefit Plans" shall mean, with respect to a specified Person,  any
employee pension benefit plan (whether or not insured), as defined in Section
3(2) of ERISA, any employee welfare benefit plan (whether or not insured) as
defined in Section 3(1) of ERISA, any plans that would be employee pension
benefit plans or employee welfare benefit plans if they were subject to ERISA,
such as foreign plans and plans for directors, any stock bonus, stock ownership,
stock option, stock purchase, stock appreciation rights, phantom stock or other
stock plan (whether qualified or nonqualified), and any bonus or incentive
compensation plan sponsored, maintained, or contributed to by the specified
Person or any of its Subsidiaries for the benefit of any of the present or
former directors, officers, employees, agents, consultants or other similar
representatives providing services to or for the specified Person or any of its
Subsidiaries in connection with such services or any such plans which have been
so sponsored, maintained, or contributed to within six years prior to the date
of this Agreement; provided, however, that such term shall not include (a)
routine employment policies and procedures developed and applied in the ordinary
course of business and consistent with past practice, including wage, vacation,
holiday and sick or other leave policies, (b) workers compensation insurance and
(c) directors and officers liability insurance.
 
     "Business Combination" shall mean (a) a merger, consolidation, share
exchange, business combination or similar transaction involving the Company; (b)
a sale, lease, exchange, transfer or other disposition of 50 percent or more of
the assets of the Company and its Subsidiaries, taken as a whole, in a single
transaction or series of transactions; or (c) the acquisition by a Person, or
any "group" (as such term is defined under Section 13(d) of the Exchange Act and
the Regulations promulgated thereunder), of beneficial ownership or the right to
acquire beneficial ownership of 50 percent or more of the outstanding Company
Common Stock, whether by tender offer or exchange offer or otherwise.

     "Business Day" means any day other than a day on which banks in the State
of Texas are authorized or obligated to be closed;

     "Certificate of Merger" shall have the meaning ascribed to such term in
Section 2.04.

                         Agreement and Plan of Merger

                                   Annex A-2
<PAGE>
 
     "Change in Control Agreements" shall mean those certain Change in Control
Agreements dated as of October 19, 1995 between the Company and certain officers
of the Company.

     "Closing" shall mean a meeting, which shall be held in accordance with
Section 3.03, of all Persons interested in the transactions contemplated by the
Agreement at which all documents deemed necessary by the parties to the
Agreement to evidence the fulfillment or waiver of all conditions precedent to
the consummation of the transactions contemplated by the Agreement are executed
and delivered.

     "Closing Date" shall mean the date of the Closing as determined pursuant to
Section 3.03.
 
     "Code" shall mean the Internal Revenue Code of 1986, as amended, and the
rules and Regulations promulgated thereunder.

     "Commission" shall mean the Securities and Exchange Commission.

     "Common Stock Exchange Ratio" shall mean the ratio of conversion of Company
Common Stock into Acquiror Common Stock pursuant to the Merger as provided in
Section 3.01(a).

     "Company" shall mean Landmark Graphics Corporation, a Delaware corporation,
and its successors from time to time.

     "Company Common Stock" shall mean the common stock, par value $0.05 per
share, of the Company.

     "Company Option Plans" shall mean the Landmark Graphics Corporation 1984
Incentive Stock Option Plan, the Landmark Graphics Corporation 1985 Incentive
Stock Option Plan, the Landmark Graphics Corporation 1987 Nonqualified Stock
Option Plan, the Landmark Graphics Corporation 1989 Flexible Stock Option Plan,
the Landmark Graphics Corporation Directors' Stock Option Plan, the Landmark
Graphics Corporation Consultants' Stock Option Plan, the Landmark Graphics
Corporation 1990 Employee Stock Option Plan and the Landmark Graphics
Corporation 1994 Flexible Incentive Plan.

     "Company Proxy Statement" shall have the meaning ascribed to such term in
Section 7.02(a).

     "Company Proxy Statement/Prospectus" shall have the meaning ascribed to
such term in Section 7.02(a).
 
     "Company Stock Options" shall mean stock options granted pursuant to the
Company Option Plans.

     "Company Stockholders' Meeting" shall have the meaning ascribed to such
term in Section 7.01(a).

                         Agreement and Plan of Merger

                                   Annex A-3
<PAGE>
 
     "Company's Consolidated Balance Sheet" shall mean the consolidated balance
sheet of the  Company as of June 30, 1995 included in the Company's Audited
Consolidated Financial Statements.

     "Company's Audited Consolidated Financial Statements" shall mean the
consolidated balance sheets of the Company and its Subsidiaries as of June 30,
1994 and June 30, 1995 and the related consolidated and combined statements of
operations and cash flows for the fiscal years ended June 30, 1993, 1994 and
1995, together with the notes thereto, all as audited by Price Waterhouse LLP,
independent accountants, under their report with respect thereto dated July 26,
1995 and included in the Company's Annual Report on Form 10-K for the fiscal
year ended June 30, 1995 filed with the Commission.

     "Company's Consolidated Financial Statements" shall mean the Company's
Audited Consolidated Financial Statements and the Company's Unaudited
Consolidated Financial Statements.

     "Company's Disclosure Letter" shall mean a letter of even date herewith
delivered by the Company to the Acquiror Companies concurrently with the
execution of the Agreement, which, among other things, shall identify exceptions
to the Company's representations and warranties contained in Article IV by
specific section and subsection references.

     "Company's Rights Agreement" shall mean that certain Rights Agreement dated
as of September 1, 1995 between the Company and Chemical Bank, as Rights Agent.

     "Company's Unaudited Consolidated Financial Statements" shall mean the
unaudited consolidated balance sheet of the Company and its Subsidiaries as of
March 31, 1996 and the related consolidated statements of operations and cash
flows for the three months periods and nine months periods ended March 31, 1995
and March 31, 1996, together with the notes thereto, included in the Company's
Quarterly Report on Form 10-Q for the quarter ended March 31, 1996 filed with
the Commission.

     "Competing Transaction" shall mean any merger, consolidation, share
exchange, business combination or similar transaction involving the Company or
any of its Subsidiaries or the acquisition in any manner, directly or
indirectly, of a Material equity interest in any voting securities of, or a
substantial portion of the assets of, the Company or any of its Significant
Subsidiaries, other than the transactions contemplated by this Agreement.

     "Confidentiality Agreement" shall mean that certain confidentiality
agreement between the Acquiror and the Company dated June 18, 1996.

     "Constituent Corporations" shall mean the Company and Newco.

     "control" (including the terms "controlled," "controlled by" and "under
common control with") means the possession, directly or indirectly or as trustee
or executor, of the power to direct or cause the direction of the management or
policies of a Person, whether through the ownership of stock or as trustee or
executor, by contract or credit arrangement or otherwise.

                         Agreement and Plan of Merger

                                   Annex A-4
<PAGE>
 
     "Court" shall mean any court or arbitration tribunal of the United States,
any foreign country or any domestic or foreign state, and any political
subdivision thereof, and shall include the European Court of Justice.

     "Current Benefit Plans" shall mean Benefit Plans that are sponsored,
maintained, or contributed to by a specified Person or any of its Subsidiaries
as of the date of this Agreement.
 
     "Effective Time" shall mean the date and time of the completion of the
filing of the Certificate of Merger with the Secretary of State of the State of
Delaware in accordance with Section 2.02.

     "Employment Agreement" shall mean that certain Executive Employment
Agreement of even date herewith between the Company and Robert P. Peebler.

     "Environmental Law or Laws" shall mean any and all laws, statutes,
ordinances, rules, regulations, or orders of any Governmental Authority
pertaining to health or the environment currently in effect and applicable to a
specified Person and its Subsidiaries, including the Clean Air Act, as amended,
the Comprehensive Environmental, Response, Compensation, and Liability Act of
1980 ("CERCLA"), as amended, the Federal Water Pollution Control Act, as
amended, the Occupational Safety and Health Act of 1970, as amended, the
Resource Conservation and Recovery Act of 1976 ("RCRA"), as amended, the Safe
Drinking Water Act, as amended, the Toxic Substances Control Act, as amended,
the Hazardous & Solid Waste Amendments Act of 1984, as amended, the Superfund
Amendments and Reauthorization Act of 1986, as amended, the Hazardous Materials
Transportation Act, as amended, the Oil Pollution Act of 1990, as amended
("OPA"),  any state or local Laws implementing the foregoing federal Laws, and
all other environmental conservation or protection Laws.  For purposes of the
Agreement, the terms "hazardous substance" and "release" have the meanings
specified in CERCLA; provided, however, that, to the extent the Laws of the
state or locality in which the property is located establish a meaning for
"hazardous substance" or "release"  that is broader than that specified in
CERCLA, such broader meaning shall apply within the jurisdiction of such state
or locality, and the term "hazardous substance" shall include all dehydration
and treating wastes, waste (or spilled) oil, and waste (or spilled) petroleum
products, and (to the extent in excess of background levels) radioactive
material, even if such are specifically exempt from classification as hazardous
substances pursuant to CERCLA or RCRA or the analogous statutes of any
jurisdiction applicable to the specified Person or its Subsidiaries or any of
their respective properties or assets.

     "ERISA" shall mean the Employee Retirement Income Security Act of 1974, as
amended, and the Regulations promulgated thereunder.
 
     "Exchange Act" shall mean the Securities Exchange Act of 1934, as amended,
and the Regulations promulgated thereunder.

     "Exchange Agent" shall mean a bank or trust company having a net worth in
excess of $100 million designated and appointed to act in the capacities
required thereof under Section 3.02.

                         Agreement and Plan of Merger

                                   Annex A-5
<PAGE>
 
     "Exchange Fund" shall mean the fund of Acquiror Common Stock, cash in lieu
of fractional share interests and dividends and distributions, if any, with
respect to such shares of Acquiror Common Stock established at the Exchange
Agent pursuant to Section 3.02.

     "Expenses" shall mean all reasonable out-of-pocket expenses (including all
fees and expenses of counsel, accountants, investment bankers, experts and
consultants to a party hereto and its affiliates) incurred by a party or on its
behalf in connection with or related to the authorization, preparation,
negotiation, execution and performance of this Agreement, the preparation,
printing, filing and mailing of the Registration Statement and the Company Proxy
Statement, the solicitation of stockholder approvals and all other matters
related to the consummation of the transactions contemplated hereby.
 
     "GAAP" shall mean accounting principles generally accepted in the United
States consistently applied by a specified Person.

     "GCL" shall mean the General Corporation Law of the State of Delaware.

     "Governmental Authority" shall mean any governmental agency or authority
(other than a Court) of the United States, any foreign country, or any domestic
or foreign state, and any political subdivision or agency thereof, and shall
include any multinational authority having governmental or quasi-governmental
powers.
 
     "HSR Act" shall mean the Hart-Scott-Rodino Antitrust Improvements Act of
1976, as amended, and the Regulations promulgated thereunder.
 
     "IRS" shall mean the Internal Revenue Service.

     "Knowledge" shall mean, with respect to either the Company or the Acquiror,
the actual knowledge (without duty of inquiry) of any executive officer of such
party.

     "Law" shall mean all laws, statutes, ordinances and Regulations of the
United States, any foreign country, or any domestic or foreign state, and any
political subdivision or agency thereof, including all decisions of Courts
having the effect of Law in each such jurisdiction.
 
     "Lien" shall mean any mortgage, pledge, security interest, encumbrance,
lien or charge of any kind (including any agreement to give any of the
foregoing), any conditional sale or other title retention agreement, any lease
in the nature thereof or the filing of or agreement to give any financing
statement under the Uniform Commercial Code of any jurisdiction.
 
     "Material" shall mean material to the condition (financial and other),
results of operations or business of a specified Person and its Subsidiaries, if
any, taken as a whole; provided, however, that, as used in this definition the
word "material" shall have the meaning accorded thereto in Section 11 of the
Securities Act.

     "Material Adverse Effect" shall mean any change or effect that would be
material and adverse to the consolidated business, condition (financial or
other), operations, performance or

                         Agreement and Plan of Merger

                                   Annex A-6
<PAGE>
 
properties (but excluding any outstanding capital stock or other securities) of
a specified Person and its Subsidiaries, if any, taken as a whole; provided,
however, that, as used in this definition the word "material" shall have the
meaning accorded thereto in Section 11 of the Securities Act.

     "Material Contract" shall mean each contract, lease, indenture, agreement,
arrangement or understanding to which a specified Person or any of its
Subsidiaries is a party or to which any of the assets or operations of such
specified Person or any of its Subsidiaries is subject that is of a type that
would be required to be included as an exhibit to a registration statement on
Form S-1 pursuant, in the case of the Company, to Paragraph (2), (4), (10) or
(14) of Item 601(b) and, in the case of the Acquiror, to Paragraph (10) (other
than clause (iii) thereof) of Item 601(b) of Regulation S-K under the Securities
Act if such a registration statement were to be filed by such Person under the
Securities Act on the date of determination.  Notwithstanding the foregoing,
such term shall, in the case of the Company, include any of  the following
contracts, agreements or commitments, whether oral or written:
 
          (1)  Any collective bargaining agreement or other agreement with any
     labor union;

          (2)  any agreement, contract or commitment with any other Person,
     other than any agency or representation entered in the ordinary course of
     business, containing any covenant limiting the freedom of such specified
     Person or any of its Subsidiaries to engage in any line of business or to
     compete with any other Person;

          (3)  any partnership, joint venture or profit sharing agreement with
     any Person, which partnership, joint venture or profit sharing agreement
     generated revenues during its most recently completed fiscal year of
     $100,000 or more;

          (4)  any employment or consulting agreement, contract or commitment
     between the Company or any of its Subsidiaries and any employee, officer or
     director thereof (i) having more than one year to run from the date hereof,
     (ii) providing for an obligation to pay or accrue compensation of $100,000
     or more per annum or (iii) providing for the payment or accrual of any
     additional compensation upon a change in control of such Person or any of
     its Subsidiaries or upon any termination of such employment or consulting
     relationship following a change in control of such Person or any of its
     Subsidiaries; and

          (5)  any agency or representation agreement with any Person which is
     not terminable by the Company or one of its Subsidiaries without penalty
     upon not more than one year's notice.

     "Merger" shall mean the merger of the Company with an into Newco as
provided in Article II of this Agreement.

     "NASD" shall mean the National Association of Securities Dealers, Inc.

                         Agreement and Plan of Merger

                                   Annex A-7
<PAGE>
 
     "Newco" shall mean Halliburton Acq. Company, a Delaware corporation and a
wholly-owned Subsidiary of the Acquiror.

     "NYSE" shall mean the New York Stock Exchange, Inc.

     "Order" shall mean any judgment, order or decree of any Court or
Governmental Authority, federal, foreign, state or local.

     "PBGC" shall mean the Pension Benefit Guaranty Corporation.
 
     "Permit" shall mean any and all permits, licenses, authorizations, orders,
certificates, registrations or other approvals granted by any Governmental
Authority.

     "Permitted Encumbrances" shall mean the following:

          (1)  liens for taxes, assessments and other governmental charges not
     delinquent or which are currently being contested  in good faith by
     appropriate proceedings; provided that, in the latter case, the specified
     Person or one of its Subsidiaries shall have set aside on its books
     adequate reserves with respect thereto;

          (2)  mechanics' and materialmen's liens not filed of record and
     similar charges not delinquent or which are filed of record but are being
     contested in good faith by appropriate proceedings; provided that, in the
     latter case, the specified Person or one of its Subsidiaries shall have set
     aside on its books adequate reserves with respect thereto;

          (3)  liens in respect of judgments or awards with respect to which the
     specified Person or one of its Subsidiaries shall in good faith currently
     be prosecuting an appeal or other proceeding for review and with respect to
     which such Person or such Subsidiary shall have secured a stay of execution
     pending such appeal or such proceeding for review; provided that, such
     Person or such Subsidiary shall have set aside on its books adequate
     reserves with respect thereto;

          (4)  easements, leases, reservations or other rights of others in, or
     minor defects and irregularities in title to, property or assets of a
     specified Person or any of its Subsidiaries; provided that, such easements,
     leases, reservations, rights, defects or irregularities do not materially
     impair the use of such property or assets for the purposes for which they
     are held; and

          (5)  any lien or privilege vested in any lessor, licensor or permittor
     for rent or other obligations of a specified Person or any of its
     Subsidiaries thereunder so long as the payment of such rent or the
     performance of such obligations is not delinquent.

     "Person" shall mean an individual, partnership, limited liability company,
corporation, joint stock company, trust, estate, joint venture, association or
unincorporated organization, or any other form of business or professional
entity, but shall not include a Governmental Authority.

                         Agreement and Plan of Merger

                                   Annex A-8
<PAGE>
 
     "Registration Statement" shall have the meaning ascribed to such term in
Section 7.02(a).

     "Regulation" shall mean any rule or regulation of any Governmental
Authority having the effect of Law.

     "Reports" shall mean, with respect to a specified Person, all reports,
registrations, filings and other documents and instruments required to be filed
by the specified Person or any of its Subsidiaries with any Governmental
Authority (other than the Commission).

     "Restricted Stock Agreement" shall mean that certain Restricted Stock
Agreement listed on Item 29 of Section 4.10 of the Company's Disclosure Letter.

     "SEC Reports" shall mean  (1) all Annual Reports on Form 10-K, (2) all
Quarterly Reports on Form 10-Q, (3) all proxy statements relating to meetings of
stockholders (whether annual or special), (4) all Current Reports on Form 8-K
and (5) all other reports, schedules, registration statements or other documents
required to be filed during a specified period by a Person with the Commission
pursuant to the Securities Act or the Exchange Act.
 
     "Securities Act" shall mean the Securities Act of 1933, as amended, and the
Regulations promulgated thereunder.
 
     "Significant Subsidiary" means any Subsidiary of the Company or Acquiror,
as the case may be, that would constitute a Significant Subsidiary of such party
within the meaning of Rule 1-02 of Regulation S-X of the Commission.

     "Software" shall mean the following computer applications programs:
2DVIEW, 3D Knowledge Integrator (3DKI), 3DVIEW, Argus, Aries, Automate,
BatchZAP!, Blitz, CIMS, Compass, Continuity Tool, Contouring Assistant, DESKTOP-
PVT, DESKTOP-VIP, DIMS, DUAL, DXF (AutoCAD), EarthCube, EnerGIS, Fast Track,
GeoLink, GES, GMS, GRIDGENR, Geo-data Works, Jaguar, LeaseMap, LGR, LogEdit,
MIMIC+, MultiWell, OASIIS, OpenWorks, OpenWorks Development Kit, PAL, PARALLEL
VIP, PetroWorks, PlotView, PostStack, POWAR, Profile, ProMAX, ProMAX VSP, QUIK+,
QUIKDIG+, QUIKWELL+, RAYMAP+, RAVE, Resin-Plus, RMS, SeisCube, Seismic Data
Check, SeisTie, SeisVision, SeisWell, SeisWorks, SigmaView 2D, SigmaView 3D,
SIVA+, SuperSeisWorks, SurfCube, StrataModel SGM, StrataModel GTM, StratWorks,
SynTool, TDQ, TOW CS, VESPA, VIP-COMP, VIP-CORE, VIP-Encore, VIP-THERM, VoxCube,
Wellbore Manager, Wellplan, Z3D, Z-Cap, and Z-Map Plus.

     "Stock Option Agreement" shall mean that certain Stock Option Agreement of
even date herewith between the Acquiror and the Company.

     A "Subsidiary" of a specified Person shall be any corporation, partnership,
limited liability company, joint venture or other legal entity of which the
specified Person (either alone or through or together with any other Subsidiary)
owns, directly or indirectly, 50 percent or more of the stock or other equity or
partnership interests the holders of which are generally entitled to vote

                         Agreement and Plan of Merger

                                   Annex A-9
<PAGE>
 
for the election of the board of directors or other governing body of such
corporation or other legal entity.

     "Superior Proposal" means a bona fide proposal made by a third Person to
acquire the Company pursuant to a tender or exchange offer for all of the
outstanding capital stock of the Company, a merger, a sale of all or
substantially all of the Company's assets or otherwise on terms that the Board
of Directors of the Company determines in its good faith judgment to be more
favorable to the Company's stockholders than the Merger (based on the written
opinion, with only customary qualifications, of the Company's independent
financial advisor that the value of the consideration to the Company's
stockholders provided for in such proposal exceeds the value of the
consideration to the Company's stockholders provided for in the Merger) and for
which financing, to the extent required, is then committed or which, in the good
faith judgment of the Board of Directors of the Company (based on the written
advice of the Company's independent financial advisor), is reasonably capable of
being obtained by such third Person.

     "Surviving Corporation" shall mean Newco as the corporation surviving the
Merger.
 
     "Tax Returns" shall mean all returns and reports of or with respect to any
Tax which are required to be filed by or with respect to the Company or any of
its Subsidiaries.
 
     "Taxes" shall mean all taxes, charges, imposts, tariffs, fees, levies or
other similar assessments or liabilities, including income taxes, ad valorem
taxes, excise taxes, withholding taxes, stamp taxes or other taxes of or with
respect to gross receipts, premiums, real property, personal property, windfall
profits, sales, use, transfers, licensing, employment, payroll and franchises
imposed by or under any Law; and such terms shall include any interest, fines,
penalties, assessments or additions to tax resulting from, attributable to or
incurred in connection with any such tax or any contest or dispute thereof.

     "Terminated Benefit Plans" shall mean Benefit Plans that were sponsored,
maintained, or contributed to by a specified Person or any of its Subsidiaries
within six years prior to the date of this Agreement but which have been
terminated prior to the date of this Agreement.

     "Voting Agreement" shall mean that certain Voting Agreement of even date
herewith between the Acquiror and S. Rutt Bridges and Barbara Ann Bridges.

                         Agreement and Plan of Merger

                                   Annex A-10
<PAGE>
 
                                                                         ANNEX B
                                        Landmark Graphics Corporation Affiliates


                             AFFILIATE'S AGREEMENT

                                    [Date]


Halliburton Company
3600 Lincoln Plaza
500 North Akard Street
Dallas, Texas  75201-3391

Ladies and Gentlemen:

     The undersigned has been advised that, as of the date hereof, the
undersigned may be deemed to be an "affiliate" of Landmark Graphics Corporation,
a Delaware corporation (the "Company"), as that term is defined for purposes of
paragraphs (c) and (d) of Rule 145 of the Regulations of the Commission under
the Securities Act.

     Pursuant to the terms and subject to the conditions of that certain
Agreement and Plan of Merger by and among Halliburton Company, a Delaware
corporation ("Acquiror"), Halliburton Acq. Company, a newly formed Delaware
corporation and a wholly-owned Subsidiary of Acquiror ("Newco"), and the Company
dated as of June 30, 1996 (the "Merger Agreement"), providing for, among other
things, the merger of the Company with and into Newco (the "Merger"), the
undersigned will be entitled to receive shares of Acquiror Common Stock in
exchange for shares of Company Common Stock owned by the undersigned at the
Effective Time of the Merger as determined pursuant to the Merger Agreement.
Capitalized terms used but not defined herein are defined in Annex A to the
Merger Agreement and are used herein with the same meanings as ascribed to them
therein.
 
     The undersigned understands that the Merger will be treated for financial
accounting purposes as a "pooling of interests" in accordance with generally
accepted accounting principles and that the staff of the Commission has issued
certain guidelines that should be followed to ensure the application of pooling
of interests accounting to the transaction.
 
     In consideration of the agreements contained herein, the Acquiror's
reliance on this letter in connection with the consummation of the Merger and
for other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, the undersigned hereby represents, warrants and agrees
that the undersigned will not make any sale, transfer or other disposition of
(i) Company Common Stock during the period from the date hereof until the
earlier of the Effective Time and the termination of the Merger Agreement (which
period, if the Merger is consummated, will be greater than thirty (30) days),
(ii) Acquiror Common Stock received by the undersigned pursuant to the Merger or
otherwise owned by the undersigned until such time as financial statements that
include at least thirty (30) days of combined operations of the Company and the
Acquiror after the Merger shall have been publicly reported, unless the
undersigned shall have delivered to the Acquiror, prior to any such sale,
transfer or other disposition, a written opinion from Arthur Andersen LLP,
independent public accountants for the
<PAGE>
 
Acquiror, or a written no-action letter from the accounting staff of the
Commission, in either case in form and substance reasonably satisfactory to the
Acquiror, to the effect that such sale, transfer or other disposition will not
cause the Merger not to be treated as a "pooling of interests" for financial
accounting purposes in accordance with generally accepted accounting principles
and the Regulations of the Commission or (iii) Acquiror Common Stock received by
the undersigned pursuant to the Merger in violation of the Securities Act or the
Regulations thereunder.  The undersigned has been advised that the offering,
sale and delivery of the shares of Acquiror Common Stock pursuant to the Merger
will have been registered with the Commission under the Securities Act on a
Registration Statement on Form S-4.  The undersigned has also been advised,
however, that, since the undersigned may be deemed to be an Affiliate of the
Company at the time the Merger is submitted for a vote of the stockholders of
the Company, the Acquiror Common Stock received by the undersigned pursuant to
the Merger can be sold by the undersigned only (i) pursuant to an effective
registration statement under the Securities Act, (ii) in conformity with the
volume and other limitations of Rule 145 promulgated by the Commission under the
Securities Act or (iii) in reliance upon an exemption from registration that is
available under the Securities Act.

     The undersigned also understands that instructions will be given to the
transfer agent for the Acquiror Common Stock with respect to the Acquiror Common
Stock to be received by the undersigned pursuant to the Merger and that there
will be placed on the certificates representing such shares of Acquiror Common
Stock, or any substitutions therefor, a legend stating in substance as follows:

     "These shares were issued in a transaction to which Rule 145 promulgated
     under the Securities Act of 1933, as amended, applies.  These shares may
     only be trans ferred in accordance with the terms of such Rule and an
     Affiliate's Agreement between the original holder of such shares and
     Halliburton Company, a copy of which agreement is on file at the principal
     offices of Halliburton Company."

It is understood and agreed that the legend set forth above shall be removed
upon surrender of certificates bearing such legend by delivery of substitute
certificates without such legend if the undersigned shall have delivered to the
Acquiror an opinion of counsel, in form and substance reasonably satisfactory to
the Acquiror, to the effect that (i) the sale or disposition of the shares
represented by the surrendered certificates may be effected without registration
of the offering, sale and delivery of such shares under the Securities Act and
(ii) the shares to be so transferred may be publicly offered, sold and delivered
by the transferee thereof without compliance with the registration provisions of
the Securities Act.

     By its execution hereof, the Acquiror agrees that it will, as long as the
undersigned owns any Acquiror Common Stock to be received by the undersigned
pursuant to the Merger, take all reasonable efforts to make timely filings with
the Commission of all reports required to be filed by it pursuant to the
Exchange Act and will promptly furnish upon written request of the undersigned a
written statement confirming that such reports have been so timely filed.

     If you are in agreement with the foregoing, please so indicate by signing
below and returning a copy of this letter to the undersigned, at which time this
letter shall become a binding agreement between us.

                                    Annex B

                                      -2-
<PAGE>
 
                                             Very truly yours,


                                             By:________________________________
                                                Name:
                                                Title:
                                                Date:
                                                Address:

ACCEPTED this ___ day
of __________, 1996

HALLIBURTON COMPANY


By:  ___________________________________________
     Name:  ______________________
     Title:  _____________________

                                    Annex B

                                      -3-
<PAGE>
 
                                                                         ANNEX C
                                                  Halliburton Company Affiliates


                             AFFILIATE'S AGREEMENT

                                    [Date]


Halliburton Company
3600 Lincoln Plaza
500 North Akard Street
Dallas, Texas  75201-3391

Ladies and Gentlemen:

     The undersigned has been advised that, as of the date hereof, the
undersigned may be deemed to be an "affiliate" of Halliburton Company, a
Delaware corporation (the "Acquiror"), as that term is defined in the
Regulations of the Commission under the Securities Act.

     The undertakings contained in this Affiliate's Agreement are being given by
the undersigned in connection with that certain Agreement and Plan of Merger by
and among Acquiror, Halliburton Acq. Company, a newly formed Delaware
corporation and a wholly-owned Subsidiary of Acquiror ("Newco"), and Landmark
Graphics Corporation, a Delaware Corporation (the "Company") dated as of June
___, 1996 (the "Merger Agreement"), providing for, among other things, the
merger of the Company with and into Newco (the "Merger").  Capitalized terms
used but not defined herein are defined in Annex A to the Merger Agreement and
are used herein with the same meanings as ascribed to them therein.
 
     The undersigned understands that the Merger will be treated for financial
accounting purposes as a "pooling of interests" in accordance with generally
accepted accounting principles and that the staff of the Commission has issued
certain guidelines that should be followed to ensure the application of pooling
of interests accounting to the transaction.
 
     In consideration of the agreements contained herein, the Acquiror's
reliance on this letter in connection with the consummation of the Merger and
for other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, the undersigned hereby represents, warrants and agrees
that the undersigned will not make any sale, transfer or other disposition of
(i) Company Common Stock during the period from the date hereof until the
earlier of the Effective Time and the termination of the Merger Agreement (which
period, if the Merger is consummated, will be greater than thirty (30) days) or
(ii) Acquiror Common Stock owned by the undersigned until such time as financial
statements that include at least thirty (30) days of combined operations of the
Company and the Acquiror after the Merger shall have been publicly reported,
unless the undersigned shall have delivered to the Acquiror, prior to any such
sale, transfer or other disposition, a written opinion from Arthur Andersen LLP,
independent public accountants for the Acquiror, or a written no-action letter
from the accounting staff of the Commission, in either case in form and
substance reasonably satisfactory to the Acquiror, to the effect that such sale,
transfer or other disposition will not cause the Merger not to be treated as a
"pooling of interests" for financial accounting purposes in accordance with
generally accepted accounting principles and the Regulations of the Commission.
<PAGE>
 
     If you are in agreement with the foregoing, please so indicate by signing
below and returning a copy of this letter to the undersigned, at which time this
letter shall become a binding agreement between us.

                                             Very truly yours,


                                             By:________________________________
                                                Name:___________________________
                                                Title:__________________________
                                                Date:___________________________
                                                Address:________________________

ACCEPTED this ___ day
of __________, 1996

HALLIBURTON COMPANY


By:  ___________________________________________
     Name: ______________________
     Title: _____________________

                                    Annex C

                                      -2-

<PAGE>
 
                                                                    EXHIBIT 99.1
                            STOCK OPTION AGREEMENT


     STOCK OPTION AGREEMENT (the "Agreement"), dated as of June 30, 1996, by and
between Landmark Graphics Corporation, a Delaware corporation (the "Company"),
and Halliburton Company, a Delaware corporation (the "Grantee").

                                   RECITALS

     The Grantee, the Company and Halliburton Acq. Company, a Delaware
corporation and a wholly-owned subsidiary of the Grantee ("Newco") propose to
enter into an Agreement and Plan of Merger dated as of the date hereof (the
"Merger Agreement") providing for, among other things, the merger (the "Merger")
of the Company with and into Newco which shall be the surviving corporation.

     The Board of Directors of the Company has recommended the approval of the
Merger Agreement and the Merger by the holders of Company Common Stock.

     As a condition and inducement to the Grantee's willingness to enter into
the Merger Agreement, the Grantee has requested that the Company agree, and the
Company has agreed, to grant the Grantee the Option (as defined below).

     NOW, THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants and agreements set forth herein and in
the Merger Agreement, the Company and the Grantee agree as follows:

          1.   Capitalized Terms.  Capitalized terms used but not defined herein
     are defined in the Merger Agreement and are used herein with the same
     meanings as ascribed to them therein; provided, however, that, as used in
     this Agreement, "Person" shall have the meaning specified in Sections
     3(a)(9) and 13(d)(3) of the Exchange Act.

          2.   Grant of Option.  Subject to the terms and conditions set forth
     herein, the Company hereby grants to the Grantee an irrevocable option (the
     "Option") to purchase, out of the authorized but unissued Company Common
     Stock, a number of shares equal to up to 15.0% of the shares of Company
     Common Stock outstanding as of the date hereof (as adjusted as set forth
     herein) (the "Option Shares"), at a purchase price of $31.857 per Option
     Share (the "Exercise Price").

          3.   Term.  The Option shall be exercisable and shall remain in full
     force and effect until the earliest to occur of (i) the Effective Time,
     (ii) the first anniversary of the receipt by Grantee of written notice from
     the Company of the occurrence of an Exercise Event (as hereinafter defined)
     or (iii) termination of the Merger Agreement prior to the
<PAGE>
 
     occurrence of an Exercise Event, at which time the Option shall terminate
     and be of no further force or effect (the "Term"). The rights and
     obligations set forth in Sections 7, 8, 9 and 10 shall not terminate when
     the right to exercise the Option terminates as set forth herein, but shall
     extend to such time as is provided in those Sections.

          4.   Exercise of Option.

               (a)  The Grantee may exercise the Option, in whole or in part, at
          any time and from time to time during the Term following the
          occurrence of an Exercise Event. Notwithstanding the expiration of the
          Term, the Grantee shall be entitled to purchase those Option Shares
          with respect to which it has exercised the Option in accordance with
          the terms hereof prior to the expiration of the Term.

               (b)  As used herein, an "Exercise Event" shall mean any of the
          following events:

                    (i)  any Person (other than the Grantee or any subsidiary of
               the Grantee) shall have commenced (as such term is defined in
               Rule 14d-2 under the Exchange Act) or shall have filed a
               registration statement under the Securities Act with respect to a
               tender offer or exchange offer to purchase any shares of Company
               Common Stock such that, upon consummation of such offer, such
               Person would own or control 25% or more of the then outstanding
               Company Common Stock;

                    (ii)  the Company or any subsidiary of the Company shall
               have authorized, recommended, proposed or publicly announced an
               intention to authorize, recommend or propose, or entered into, an
               agreement with any Person (other than the Grantee or any
               subsidiary of the Grantee) to (A) effect a merger, consolidation,
               share exchange or similar transaction involving the Company or
               any of its Significant Subsidiaries, (B) sell, lease or otherwise
               dispose of assets of the Company or its subsidiaries representing
               15% or more of the consolidated assets of the Company and its
               subsidiaries or (C) issue, sell or otherwise dispose of
               (including by way of merger, consolidation, share exchange or any
               similar transaction) securities (or options, rights or warrants
               to purchase, or securities convertible into or exchangeable for,
               such securities) representing 15% or more of the voting power of
               the Company or any of its Significant Subsidiaries;

                    (iii)  any Person (other than the Grantee or any Subsidiary
               of the Grantee or the Company or, in a fiduciary capacity, any of
               its Subsidiaries) shall have, subsequent to the date of this
               Agreement, acquired beneficial ownership (as such term is defined
               in Rule 13d-3 under the Exchange Act) or the right to acquire
               beneficial ownership of, or any "Group" (as such

                            Stock Option Agreement
                                      
                                      -2-
<PAGE>
 
               term is defined under the Exchange Act) shall have been formed
               which beneficially owns or has the right to acquire beneficial
               ownership of, 25% or more of the then outstanding Company Common
               Stock; or

                    (iv) the holders of Company Common Stock shall not have
               approved the Merger Agreement at the meeting of such stockholders
               held for the purpose of voting on the Merger Agreement or such
               meeting shall not have been called as required by the terms of
               the Merger Agreement or shall have been canceled, in each case
               after any Person (other than the Grantee or any subsidiary of the
               Grantee) shall have publicly announced a proposal, or publicly
               disclosed an intention to make a proposal, to engage in any
               transaction described in clauses (i), (ii) or (iii) above, or the
               Company's Board of Directors shall have withdrawn or modified in
               a manner materially adverse to the Grantee the recommendation of
               the Company's Board of Directors that the holders of the Company
               Common Stock approve the Merger Agreement and the Merger.
 
          (c)  If the Grantee wishes to exercise the Option, it shall send a
     written notice (the date of which being herein referred to as the "Notice
     Date") to the Company specifying (i) the total number of Option Shares it
     intends to purchase pursuant to such exercise and (ii) a place and a date
     not earlier than three (3) Business Days nor later than fifteen (15)
     Business Days from the Notice Date for the closing of such purchase (the
     "Closing Date"); provided, however, that, if the closing of the purchase
     and sale pursuant to the Option (the "Closing") cannot be consummated by
     reason of any applicable Law, Regulation or Order, the period of time that
     otherwise would run pursuant to this sentence shall run instead from the
     date on which such restriction on consummation has expired or been
     terminated; and, provided, further, that, without limiting the foregoing,
     if prior notification to or approval of any Governmental Authority is
     required in connection with such purchase, the Grantee and, if applicable,
     the Company shall promptly file the required notice or application for
     approval and shall expeditiously process the same (and the Company shall
     cooperate with the Grantee in the filing of any such notice or application
     and the obtaining of any such approval), and the period of time that
     otherwise would run pursuant to this sentence shall run instead from the
     date on which, as the case may be, (i) any required notification period has
     expired or been terminated or (ii) such approval has been obtained and, in
     either event, any requisite waiting period has passed.

          (d)  Notwithstanding Section 4(c), in no event shall any Closing Date
     be more than eighteen (18) months after the related Notice Date, and, if
     the Closing Date shall not have occurred within eighteen (18) months after
     the related Notice Date due to the failure to obtain any required approval
     of a Governmental Authority, the exercise of the Option effected on the
     Notice Date shall be deemed to have expired.  If (i) the Grantee receives
     official notice that an approval of any Governmental Authority required for
     the purchase of Option Shares will not be issued or granted or (ii) a
     Closing Date shall not have occurred within eighteen (18) months after the
     related Notice Date due to the failure to

                            Stock Option Agreement
                                      
                                      -3-
<PAGE>
 
     obtain any such required approval of a Governmental Authority, the Grantee
     shall be entitled to exercise its right as set forth in Section 6 or to
     exercise the Option in connection with the resale of the Company Common
     Stock or other securities pursuant to a registration statement as provided
     in Section 8.  The provisions of this Section 4 and Section 5 shall apply
     with appropriate adjustments to any such exercise.

          5.   Payment and Delivery of Certificates.

               (a)  On each Closing Date, the Grantee shall pay to the Company
          in immediately available funds by wire transfer to a bank account
          designated by the Company an amount equal to the Exercise Price
          multiplied by the Option Shares to be purchased on such Closing Date.

               (b)  At each Closing, simultaneously with the delivery of
          immediately available funds as provided in Section 5(a), the Company
          shall deliver to the Grantee a certificate or certificates
          representing the Option Shares to be purchased at such Closing, which
          Option Shares shall be fully paid and nonassessable and free and clear
          of all Liens, and Grantee shall deliver to the Company its written
          agreement that the Grantee will not offer to sell or otherwise dispose
          of such Option Shares in violation of applicable Law or the provisions
          of this Agreement.

               (c)  Certificates for the Option Shares delivered at each Closing
          shall be endorsed with a restrictive legend which shall read
          substantially as follows:

               THE TRANSFER OF THE STOCK REPRESENTED BY THIS CERTIFICATE
               IS SUBJECT TO RESTRICTIONS ARISING UNDER THE SECURITIES
               ACT OF 1933, AS AMENDED, AND PURSUANT TO THE TERMS OF A
               STOCK OPTION AGREEMENT DATED AS OF JUNE 30, 1996. A COPY
               OF SUCH AGREEMENT WILL BE PROVIDED TO THE HOLDER HEREOF
               WITHOUT CHARGE UPON RECEIPT BY THE COMPANY OF A WRITTEN
               REQUEST THEREFOR.

          A new certificate or certificates evidencing the same number of shares
          of the Company Common Stock will be issued to the Grantee in lieu of
          the certificate bearing the above legend, which new certificate shall
          not bear such legend, insofar as it applies to the Securities Act, if
          the Grantee shall have delivered to the Company a copy of a letter
          from the staff of the Commission, or an opinion of counsel in form and
          substance reasonably satisfactory to the Company and its counsel, to
          the effect that such legend is not required for purposes of the
          Securities Act.

                            Stock Option Agreement
                                      
                                      -4-
<PAGE>
 
          6.   Adjustment Upon Changes in Capitalization, Etc.

               (a)  In the event of any change in the Company Common Stock by
          reason of a stock dividend, split-up, combination, recapitalization,
          exchange of shares or similar transaction, the type and number of
          shares or securities subject to the Option, and the Exercise Price
          therefor, shall be adjusted appropriately, and proper provision shall
          be made in the agreements governing such transaction, so that the
          Grantee shall receive upon exercise of the Option the same class and
          number of outstanding shares or other securities or property that
          Grantee would have received in respect of the Company Common Stock if
          the Option had been exercised immediately prior to such event, or the
          record date therefor, as applicable.  If any additional shares of the
          Company Common Stock are issued after the date of this Agreement
          (other than pursuant to an event described in the first sentence of
          this Section 6(a)), the Company shall give written notice thereof to
          the Grantee and, at the Grantee's option exercisable within ten (10)
          Business Days after the Grantee's receipt of such notice, the number
          of shares of the Company Common Stock subject to the Option shall be
          adjusted so that, after such issuance, it equals 15.0% of the number
          of shares of the Company Common Stock then issued and outstanding, so
          that shares issued pursuant to the Option and shares remaining to be
          issued pursuant to the Option will, in the aggregate, equal 15% of the
          then issued and outstanding shares of Company Common Stock; provided,
          however, that the number of shares of the Company Common Stock subject
          to the Option shall only be increased to the extent the Company then
          has available authorized but unissued and unreserved shares of the
          Company Common Stock.

               (b)  If the Company shall enter into an agreement (i) to
          consolidate or exchange shares with or merge into any Person, other
          than the Grantee or one of its subsidiaries, and shall not be the
          continuing or surviving corporation or other Person of such
          consolidation or merger, (ii) to permit any Person, other than the
          Grantee or one of its Subsidiaries, to merge into the Company and the
          Company shall be the continuing or surviving corporation, but, in
          connection with such merger, the then outstanding shares of Company
          Common Stock shall be changed into or exchanged for stock or other
          securities of the Company or any other Person or cash or any other
          property, or the shares of Company Common stock outstanding
          immediately before such merger shall after such merger represent less
          than 50% of the outstanding common shares and common share equivalents
          of the Company or (iii) to sell, lease or otherwise transfer all or
          substantially all of its assets to any Person, other than the  Grantee
          or one of its Subsidiaries, then, and in each such case, the agreement
          governing such transaction shall make proper provisions so that the
          Option shall, upon the consummation of any such transaction and upon
          the terms and conditions set forth herein, be converted into, or
          exchanged for, an option, at the election of the Grantee, of any of
          the following Persons (as designated by the Grantee) (A) the Acquiring
          Corporation (as

                            Stock Option Agreement
                                      
                                      -5-
<PAGE>
 
          hereinafter defined), (B) any Person that controls the Acquiring
          Corporation or (C) in the case of a merger described in clause (ii),
          the Company.

               (c)  For purposes of this Section 6, "Acquiring Corporation"
          means (i) the continuing or surviving corporation or other Person of a
          consolidation, share exchange or merger with the Company (if other
          than the Company), (ii) the Company in a merger or share exchange in
          which the Company is the continuing or surviving corporation and (iii)
          the transferee of all or substantially all of the Company's assets.
          The provisions of Sections 7, 8, 9, 10 and 11 shall apply with
          appropriate adjustments to any securities for which the Option becomes
          exercisable pursuant to this Section 6.

          7.   Repurchase at the Option of Grantee.

               (a)  Unless the Option shall have theretofore expired or been
          terminated in accordance with the terms hereof, at the request of the
          Grantee made at any time commencing upon the first occurrence of a
          Repurchase Event (as hereinafter defined) and ending on the first
          anniversary thereof (the "Put Period"), the Company (or any successor
          thereto) shall repurchase from the Grantee (i) that portion of the
          Option that then remains unexercised and (ii) all (but not less than
          all) the shares of Company Common Stock purchased by the Grantee
          pursuant hereto and with respect to which the Grantee then has
          beneficial ownership.  The date on which the Grantee exercises its
          rights under this Section 7 is referred to as the "Request Date."
          Such repurchase shall be at an aggregate price (the "Section 7
          Repurchase Consideration") equal to the sum of:

                    (i) the aggregate exercise price paid for any shares of
               Company Common Stock acquired pursuant to the Option and with
               respect to which the Grantee then has beneficial ownership;

                    (ii) the excess, if any, of the Applicable Price (as defined
               below), over the Exercise Price (subject to adjustment pursuant
               to Section 6) paid (or, in the case of Option Shares with respect
               to which the Option has been exercised but the Closing Date has
               not occurred, payable) by the Grantee for each share of Company
               Common Stock with respect to which the Option has been exercised
               and with respect to which the Grantee then has beneficial
               ownership, multiplied by the number of such shares; and

                    (iii)  the excess, if any, of (x) the Applicable Price for
               each share of Company Common Stock over (y) the Exercise Price
               (subject to adjustment pursuant to Section 6), multiplied by the
               number of shares of Company Common Stock with respect to which
               the Option has not been exercised.

                            Stock Option Agreement
                                      
                                      -6-
<PAGE>
 
               (b)  If the Grantee exercises its rights under this Section 7,
          the Company shall, within ten (10) Business Days after the Request
          Date, pay the Section 7 Repurchase Consideration to the Grantee in
          immediately available funds, and the Grantee shall surrender to the
          Company the Option and the certificates evidencing the shares of
          Company Common Stock purchased thereunder with respect to which the
          Grantee then has beneficial ownership, and the Grantee shall warrant
          to the Company that, immediately prior to the repurchase thereof
          pursuant to this Section 7, the Grantee had sole record and beneficial
          ownership of such shares and that such shares were then held free and
          clear of all Liens.

               (c)  For purposes of this Agreement, the "Applicable Price' means
          the highest of (i) the highest price per share at which a tender or
          exchange offer has been made for shares of Company Common Stock after
          the date hereof and on or prior to the Request Date, (ii) the price
          per share to be paid by any third Person for shares of Company Common
          Stock, in each case pursuant to an agreement for a merger or other
          business combination transaction with the Company entered into on or
          prior to the Request Date, or (iii) the highest closing sales price
          per share of Company Common Stock quoted on the New York Stock
          Exchange Composite Transactions or, if not so quoted, on the New York
          Stock Exchange (or if Company Common Stock is not quoted on the New
          York Stock Exchange, the highest bid price per share as quoted on The
          NASDAQ Stock Market or, if the shares of Company Common Stock are not
          quoted thereon, on the principal trading market on which such shares
          are traded as reported by a recognized source) during the sixty (60)
          Business Days preceding the Request Date.  If the consideration to be
          offered, paid or received pursuant to either of the foregoing clauses
          (i) or (ii) shall be other than in cash, the value of such
          consideration shall be determined in good faith by an independent
          nationally recognized investment banking firm selected by the Grantee
          and reasonably acceptable to the Company, which determination shall be
          conclusive for all purposes of this Agreement.

               (d)  As used herein, a "Repurchase Event" means the occurrence of
          any Exercise Event specified in Section 4(b)(ii), (iii) or (iv).

               (e)  Notwithstanding any provision to the contrary in this
          Agreement, the Grantee may not exercise its rights pursuant to this
          Section 7 in a manner that would result in the cash payment to the
          Grantee of an aggregate amount under this Section 7 of more than $24
          million, including the amount, if any, of the Termination Fee paid to
          the Grantee pursuant to Section 9.05 of the Merger Agreement;
          provided, however, that nothing in this sentence shall limit the
          Grantee's ability to exercise the Option in accordance with its terms.

                            Stock Option Agreement
                                      
                                      -7-
<PAGE>
 
          8.   Repurchase at the Option of The Company.

               (a)  Unless the Grantee shall have previously exercised its
          rights under Section 7, at the request of the Company during the six-
          month period commencing at the expiration of the Put Period (the "Call
          Period"), the Company may repurchase from the Grantee, and the Grantee
          shall sell to the Company, all (but not less than all) the shares of
          Company Common Stock acquired by the Grantee pursuant hereto and with
          respect to which the Grantee has beneficial ownership at the time of
          such repurchase at a price per share equal to the greater of (A) the
          Current Market Price (as hereinafter defined) or (B) the Exercise
          Price per share in respect of the shares so acquired (such price
          multiplied by the number of shares of Company Common Stock to be
          repurchased pursuant to this Section 8 being herein called the
          "Section 8 Repurchase Consideration"); provided, however, that the
          Grantee, within thirty (30) days following the Company's notice of its
          intention to purchase shares pursuant to this Section 8, may deliver
          an Offeror's Notice pursuant to Section 10, in which case the
          provisions of Section 10 and not those of this Section 8 shall control
          (unless the sale to a third Person contemplated thereby is not
          consummated); and provided, further, that the Company's rights under
          this Section 8 shall be suspended (and the Call Period shall be
          extended accordingly) during any period when the exercise of such
          rights would subject the Grantee to liability pursuant to Section
          16(b) of the Exchange Act by reason of the issuance of the Option, any
          adjustment pursuant to Section 6 hereof, the Grantee's purchase of
          shares of Company Common Stock hereunder or the Grantee's sale of
          shares pursuant to Section 7, 8 or 10.

               (b)  If the Company exercises its rights under this Section 8 and
          the Grantee does not deliver an Offeror's Notice or, having delivered
          an Offeror's Notice, the Grantee does not sell the shares to a third
          Person pursuant thereto, the Company shall, within ten (10) Business
          Days after the expiration of the Grantee's rights to deliver an
          Offeror's Notice or to sell the shares subject to an Offeror's Notice
          to a third Person, pay the Section 8 Repurchase Consideration in
          immediately available funds, and the Grantee shall surrender to the
          Company certificates evidencing the shares of Company Common Stock
          purchased hereunder, and the Grantee shall warrant to the Company
          that, immediately prior to the repurchase thereof pursuant to this
          Section 8, the Grantee had sole record and beneficial ownership of
          such shares and that such shares were then held free and clear of all
          Liens.

               (c)  As used herein, "Current Market Price" means the average
          closing sales price per share of Company Common Stock quoted on the
          New York Stock Exchange Composite Transactions, or, if not so quoted,
          on the New York Stock Exchange (or if Company Common Stock is not
          quoted on the New York Stock Exchange, on The NASDAQ Stock Market or,
          if the shares of Company Common Stock are not quoted thereon, on the
          principal trading market on which such

                            Stock Option Agreement
                                      
                                      -8-
<PAGE>
 
          shares are traded as reported by a recognized source) for the ten (10)
          Business Days preceding the date of the Company's request for
          repurchase pursuant to this Section 8.

          9.   Registration Rights.  The Company shall, if requested by the
     Grantee at any time and from time to time within three years of the first
     exercise of the Option (the "Registration Period"), as expeditiously as
     practicable prepare, file and cause to be made effective up to two
     registration statements under the Securities Act if such registration is
     necessary or desirable in order to permit the offering, sale and delivery
     of any or all shares of Company Common Stock or other securities that have
     been acquired by or are issuable to the Grantee upon exercise of the Option
     in accordance with the intended method of sale or other disposition stated
     by the Grantee, including, at the sole discretion of the Company,  a
     "shelf" registration statement under Rule 415 under the Securities Act or
     any successor provision, and the Company shall use all reasonable efforts
     to qualify such shares or other securities under any applicable state
     securities laws.  Without the Grantee's prior written consent, no other
     securities may be included in any such registration.  The Grantee agrees to
     use all reasonable efforts to cause, and to cause any underwriters of any
     sale or other disposition to cause, any sale or other disposition pursuant
     to such registration statement to be effected on a widely distributed basis
     so that upon consummation thereof no purchaser or transferee shall own
     beneficially more than 2% of the then outstanding voting power of the
     Company.  The Company shall use all reasonable efforts to cause each such
     registration statement to become effective, to obtain all consents or
     waivers of other parties which are required therefor and to keep such
     registration statement effective for such period not in excess of 180 days
     from the day such registration statement first becomes effective as may be
     reasonably necessary to effect such sale or other disposition.  The
     obligations of the Company hereunder to file a registration statement and
     to maintain its effectiveness may be suspended for one or more periods of
     time not exceeding sixty (60) days in the aggregate if the Board of
     Directors of the Company shall have determined in good faith that the
     filing of such registration or the maintenance of its effectiveness would
     require disclosure of nonpublic information that would materially and
     adversely affect the Company.  The expenses associated with the preparation
     and filing of any such registration statement pursuant to this Section 9
     and any sale covered thereby (including any fees related to blue sky
     qualifications and filing fees in respect of the National Association of
     Securities Dealers, Inc.) ("Registration Expenses") shall be for the
     account of the Company except for underwriting discounts or commissions or
     brokers' fees in respect to shares to be sold by the Grantee and the fees
     and disbursements of the Grantee's counsel; provided, however, that the
     Company shall not be required to pay for any Registration Expenses with
     respect to such registration if the registration request is subsequently
     withdrawn at the request of the Grantee unless the Grantee agrees to
     forfeit its right to request one registration; provided further, however,
     that, if at the time of such withdrawal the Grantee has learned of a
     material adverse change in the results of operations, condition (financial
     or other), business or prospects of the Company from that known to the
     Grantee at the time of its request and has withdrawn the request with
     reasonable promptness following disclosure

                            Stock Option Agreement
                                      
                                      -9-
<PAGE>
 
     by the Company of such material adverse change, then the Grantee shall not
     be required to pay any of such expenses and shall retain all remaining
     rights to request registration. The Grantee shall provide all information
     reasonably requested by the Company for inclusion in any registration
     statement to be filed hereunder. If during the Registration Period the
     Company shall propose to register under the Securities Act the offering,
     sale and delivery of Company Common Stock for cash for its own account or
     for any other stockholder of the Company pursuant to a firm underwriting,
     it shall, in addition to the Company's other obligations under this Section
     9, allow the Grantee the right to participate in such registration provided
     that the Grantee participates in the underwriting; provided, however, that,
     if the managing underwriter of such offering advises the Company in writing
     that in its opinion the number of shares of Company Common Stock requested
     to be included in such registration exceeds the number which can be sold in
     such offering, the Company shall, after fully including therein all
     securities to be sold by the Company, include the shares requested to be
     included therein by Grantee pro rata (based on the number of shares
     intended to be included therein) with the shares intended to be included
     therein by Persons other than the Company. In connection with any offering,
     sale and delivery of Company Common Stock pursuant to a registration
     statement effected pursuant to this Section 9, the Company and the Grantee
     shall provide each other and each underwriter of the offering with
     customary representations, warranties and covenants, including covenants of
     indemnification and contribution. For purposes of determining whether two
     requests have been made under this Section 9, only requests relating to a
     registration statement that has become effective under the Securities Act
     and pursuant to which the Grantee has disposed of all shares covered
     thereby in the manner contemplated therein shall be counted.

          10.  First Refusal.  At any time after the first occurrence of an
     Exercise Event and prior to the second anniversary of the first purchase of
     shares of Company Common Stock pursuant to the Option, if the Grantee shall
     desire to sell, assign, transfer or otherwise dispose of all or any of the
     shares of Company Common Stock or other securities acquired by it pursuant
     to the Option, it shall give the Company written notice of the proposed
     transaction (an "Offeror's Notice"), identifying the proposed transferee,
     accompanied by a copy of a binding offer to purchase such shares or other
     securities signed by such transferee and setting forth the terms of the
     proposed transactions.  An Offeror's Notice shall be deemed an offer by the
     Grantee to the Company, which may be accepted, in whole but not in part,
     within ten (10) Business Days of the receipt of such Offeror's Notice, on
     the same terms and conditions and at the same price at which the Grantee is
     proposing to transfer such shares or other securities to such transferee.
     The purchase of any such shares or other securities by the Company shall be
     settled within ten (10) Business Days of the date of the acceptance of the
     offer and the purchase price shall be paid to the Grantee in immediately
     available funds.  In the event of the failure or refusal of the Company to
     purchase all the shares or other securities covered by an Offeror's Notice,
     the Grantee may, within sixty (60) days from the date of the Offeror's
     Notice, sell all, but not less than all, of such shares or other securities
     to the proposed transferee at no less than the price specified and on terms
     no more favorable than those

                            Stock Option Agreement
                                     
                                     -10-
<PAGE>
 
     set forth in the Offeror's Notice; provided, however, that the provisions
     of this sentence shall not limit the rights the Grantee may otherwise have
     if the Company has accepted the offer contained in the Offeror's Notice and
     wrongfully refuses to purchase the shares or other securities subject
     thereto.  The requirements of this Section 10 shall not apply to (a) any
     disposition as a result of which the proposed transferee would own
     beneficially not more than 2% of the outstanding voting power of the
     Company, (b) any disposition of Company Common Stock or other securities by
     a Person to whom the Grantee has assigned its rights under the Option with
     the consent of the Company, (c) any sale by means of a public offering
     registered under the Securities Act or (d) any transfer to a wholly-owned
     Subsidiary of the Grantee which agrees in writing to be bound by the terms
     hereof.

          11.  Listing.  If the Company Common Stock or any other securities
     then subject to the Option are then listed on the New York Stock Exchange,
     the Company, upon the occurrence of an Exercise Event, will promptly file
     an application to list on the New York Stock Exchange the shares of the
     Company Common Stock or other securities then subject to the Option and
     will use all reasonable efforts to cause such listing application to be
     approved as promptly as practicable.

          12.  Replacement of Agreement.  Upon receipt by the Company of
     evidence reasonably satisfactory to it of the loss, theft, destruction or
     mutilation of this Agreement, and (in the case of loss, theft or
     destruction) of reasonably satisfactory indemnification, and upon surrender
     and cancellation of this Agreement, if mutilated, the Company will execute
     and deliver a new Agreement of like tenor and date.  Any such new Agreement
     shall constitute an additional contractual obligation of the Company,
     whether or not the Agreement so lost, stolen, destroyed or mutilated shall
     at any time be enforceable by anyone.

          13.  Miscellaneous.

               (a)  Expenses.  Except as otherwise provided in the Merger
          Agreement or in Sections 7, 8 and 9 hereof, each of the parties hereto
          shall bear and pay all costs and expenses incurred by it or on its
          behalf in connection with the transactions contemplated hereunder,
          including fees and expenses of its own financial consultants,
          investment bankers, accountants and counsel.

               (b)  Waiver and Amendment. Any provision of this Agreement may be
          waived at any time by the party that is entitled to the benefits of
          such provision. This Agreement may not be modified, amended, altered
          or supplemented except upon the execution and delivery of a written
          agreement executed by the parties hereto.

               (c)  Entire Agreement; No Third Party Beneficiary; Severability.
          Except as otherwise set forth in the Merger Agreement, this Agreement
          (including the

                            Stock Option Agreement
                                     
                                     -11-
<PAGE>
 
          Merger Agreement and the other documents and instruments referred to
          herein) (i) constitutes the entire agreement and supersedes all prior
          agreements and understandings, both written and oral, between the
          parties with respect to the subject matter hereof and (ii) is not
          intended to confer upon any Person other than the parties hereto any
          rights or remedies hereunder.  If any term, provision, covenant or
          restriction of this Agreement is held by a court of competent
          jurisdiction to be invalid, void or unenforceable, the remainder of
          the terms, provisions, covenants and restrictions of this Agreement
          shall remain in full force and effect and shall in no way be affected,
          impaired or invalidated.

               (d)  Governing Law.  This Agreement shall be governed by, and
          construed in accordance with, the Laws of the State of Texas,
          regardless of the Laws that might otherwise govern under applicable
          principles of conflicts of law; provided, however, that any matter
          involving the internal corporate affairs of any party hereto shall be
          governed by the provisions of the GCL.

               (e)  Descriptive Headings.  The descriptive headings contained
          herein are for convenience or reference only and shall not affect in
          any way the meaning or interpretation of this Agreement.

               (f)  Notices.  All notices and other communications hereunder
          shall be in writing and shall be deemed given if delivered personally,
          telecopied (with confirmation) 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):

          If to the Company to:

               Landmark Graphics Corporation
               15150 Memorial Drive
               Houston, Texas  77079-4304
               Attention:  Patti Massaro, General Counsel
                          and Corporate Secretary
               Telecopier No.: (713) 560-1383

          with a copy to:

               Winstead Sechrest & Minick P.C.    Shearman & Sterling
               5400 Renaissance Tower             599 Lexington Avenue
               1201 Elm Street                    New York, New York 10022
               Dallas, Texas  75270                Attention:  David W. Heleniak
               Attention: Robert E. Crawford, Jr. Telecopier No.: (212) 848-7179
               Telecopier No.:  (214) 745-5390

                            Stock Option Agreement
                                     
                                     -12-
<PAGE>
 
          If to Grantee to:

               Halliburton Company
               3600 Lincoln Plaza
               500 North Akard Street
               Dallas, Texas  75201-3391
               Attention:  Lester L. Coleman, Executive Vice President
                              and General Counsel
               Telecopier No.:  (214) 978-2658

          with a copy to:

               Vinson & Elkins L.L.P.
               2300 First City Tower
               1001 Fannin Street
               Houston, Texas  77002-6760
               Attention:  William E. Joor III, Esq.
               Telecopier No.:  (713) 615-5282

               (g)  Counterparts.  This Agreement and any amendments hereto may
          be executed in two counterparts, each of which shall be considered one
          and the same agreement and shall become effective when both
          counterparts have been signed by each of the parties and delivered to
          the other party, it being understood that both parties need not
          execute the same counterpart.

               (h)  Assignment.  Neither this Agreement nor any of the rights,
          interests or obligations hereunder or under the Option shall be
          assigned by either of the parties hereto (whether by operation of law
          or otherwise) without the prior written consent of the other party,
          except that the Grantee may assign this Agreement to a wholly-owned
          Subsidiary of the Grantee; provided, however, that no such assignment
          shall have the effect of releasing the Grantee from its obligations
          hereunder.  Subject to the preceding sentence, this Agreement shall be
          binding upon, inure to the benefit of and be enforceable by the
          parties and their respective successors and assigns.

               (i)  Further Assurances.  In the event of any exercise of the
          Option by the Grantee, the Company and the Grantee shall execute and
          deliver all other documents and instruments and take all other action
          that may be reasonably necessary in order to consummate the
          transactions provided for by such exercise.

               (j)  Specific Performance.  The parties hereto agree that this
          Agreement may be enforced by either party through specific
          performance, injunctive relief and other equitable relief.  Both
          parties further agree to waive any requirement for the securing or
          posting of any bond in connection with the obtaining of any such

                            Stock Option Agreement
                                     
                                     -13-
<PAGE>
 
          equitable relief and that this provision is without prejudice to any
          other rights that the parties hereto may have for any failure to
          perform this Agreement.

     IN WITNESS WHEREOF, the Company and the Grantee have caused this Stock
Option Agreement to be signed by their respective officers thereunto duly
authorized, all as of the day and year first written above.

                                 LANDMARK GRAPHICS CORPORATION


                                 By:   _________________________________________
                                    Robert P. Peebler
                                    President, Chief Executive Officer
                                     and Chief Operating Officer


                              HALLIBURTON COMPANY


                                 By:   _________________________________________
                                    Lester L. Coleman
                                    Executive Vice President and General Counsel



                            Stock Option Agreement
                                     
                                     -14-

<PAGE>
 
                                                                    EXHIBIT 99.2

                               VOTING AGREEMENT


     VOTING AGREEMENT ("Agreement") dated as of June 30, 1996, between
Halliburton Company, a Delaware corporation (the "Acquiror"), and S. Rutt
Bridges and Barbara Ann Bridges (the "Stockholders"), holders of shares of
common stock, par value $0.05 per share, of Landmark Graphics Corporation, a
Delaware corporation (the "Company").

                                   RECITALS:

     The Stockholders beneficially own an aggregate of 1,971,263 shares
(together with any additional shares as to which beneficial ownership is
acquired by any member of the Stockholder Group described below, the "Company
Shares") of common stock, par value $0.05 per share ("Company Common Stock"), of
the Company.

     The Acquiror is prepared to enter into an Agreement and Plan of Merger with
the Company (the "Merger Agreement") providing for the merger of the Company
with and into a wholly-owned subsidiary of the Acquiror and the conversion in
such merger of each share of Company Common Stock into the number of shares of
the Common Stock, par value $2.50 per share, of the Acquiror set forth in the
Merger Agreement (the "Merger").

     To facilitate the Merger, the Stockholders are willing to enter into
certain arrangements with respect to the Company Shares.

     NOW, THEREFORE, in consideration of the premises set forth above, the
mutual promises set forth below, and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
agree as follows:

     1.   Stockholders' Support of the Merger.  From the date hereof until
February 28, 1997, or, if earlier, termination of the Merger Agreement:

          (a)  Except as contemplated by the Merger Agreement, neither the
     Stockholders nor any Person controlled by either Stockholder or any
     Affiliate or Associate thereof, other than the Company and its subsidiaries
     (collectively, the "Stockholder Group"), will, directly or indirectly,
     sell, transfer, pledge or otherwise dispose of, or grant a proxy with
     respect to, any Company Shares to any Person other than any member of the
     Stockholder Group or the Acquiror or its designee, or grant an option with
     respect to any of the Company Shares or enter into any other agreement or
     arrangement with respect to any of the Company Shares.

          (b)  The Stockholders agree that the Stockholders will vote, and will
     cause each member of the Stockholder Group to vote, all Company Shares
     beneficially owned by such Persons (i) in favor of the Merger and (ii)
     subject to the provisions of paragraph (c) below, against any combination
     proposal or other matter that may interfere or be inconsistent with the
     Merger (including without limitation a Competing Transaction).
<PAGE>
 
          (c)  The Stockholders agree that, if reasonably requested by the
     Acquiror in order to facilitate the Merger, they will not, and they will
     cause each member of the Stockholder Group not to, attend or vote any
     Company Shares beneficially owned by any such Person at any annual or
     special meeting of stockholders or execute any written consent of
     stockholders.

          (d)  The Stockholders hereby consent to the Acquiror's announcement in
     any press release, public filing, advertisement or other document, that the
     Stockholders have entered into this Agreement.

          (e)  To the extent inconsistent with the provisions of this Section 1,
     each member of the Stockholder Group hereby revokes any and all proxies
     with respect to such member's Company Shares or any other voting securities
     of the Company.
 
     2.   Miscellaneous

          (a)  The Stockholders, on the one hand, and the Acquiror, on the
     other, acknowledge and agree that irreparable damage would occur if any of
     the provisions of this Agreement were not performed in accordance with
     their specific terms or were otherwise breached. It is accordingly agreed
     that the parties hereto shall be entitled to an injunction or injunctions
     to prevent breaches of the provisions of this Agreement and to enforce
     specifically the terms and provisions hereof in any court of the United
     States or any state thereof having jurisdiction, in addition to any other
     remedies to which they may be entitled at law or equity.

          (b)  Descriptive headings are for convenience only and shall not
     control or affect the meaning or construction of any provision of this
     Agreement.

          (c)  All notices, consents, requests, instructions, approvals and
     other communications provided for herein shall be validly given, made or
     served, if in writing and delivered personally, by telecopier (subject to
     receipt of electronic confirmation) or sent by registered mail, postage
     prepaid:

          If to the Acquiror:

               Halliburton Company
               3600 Lincoln Plaza
               500 North Akard Street
               Dallas, Texas  75201-3391
               Attention:  Lester L. Coleman, Executive Vice President
                          and General Counsel
               Telecopier No.:  (214) 978-2658

                               Voting Agreement

                                      -2-
<PAGE>
 
          with a copy to:

               Vinson & Elkins L.L.P.
               First City Tower
               1001 Fannin
               Houston, Texas  77002-6760
               Attention:  William E. Joor III
               Telecopier No.:  (713) 758-2346

          If to the Stockholders:

               S. Rutt Bridges
               34 Silver Fox Circle
               Greenwood Village, Colorado  80121

          and

               Barbara Ann Bridges
               4200 East Plum Court
               Greenwood Village, Colorado  80121

     or to such other address or telecopier number as any party may, from time
     to time, designate in a written notice given in a like manner.  Notice
     given by telecopier shall be deemed delivered on the day the sender
     receives telecopier confirmation that such notice was received at the
     telecopier number of the addressee.  Notice given by mail as set out above
     shall be deemed delivered three days after the date the same is postmarked.

          (d)  From and after the termination of this Agreement, the covenants
     of the parties set forth herein shall be of no further force or effect and
     the parties shall be under no further obligation with respect thereto.

          (e)  Definitions.  For purposes of this Agreement, the following terms
               -----------                                                      
     shall have the following meanings:

               (i)   Affiliate.  "Affiliate" shall have the meaning ascribed to
                     ---------          
          it in Rule 12b-2 of the General Rules and Regulations under the
          Exchange Act, as in effect on the date hereof.

               (ii)  Associate.  "Associate" shall have the meaning ascribed to
                     ---------                                                 
          it in Rule 12b-2 of the General Rules and Regulations under the
          Exchange Act, as in effect on the date hereof.

                               Voting Agreement

                                      -3-
<PAGE>
 
               (iii)  Beneficial Owner.  A person shall be deemed a "beneficial
                      ----------------                                         
          owner" of or to have "beneficial ownership" of Company Shares in
          accordance with the interpretations of the term "beneficial ownership"
          as defined in Rule 13-d(3) under the Exchange Act, as in effect on the
          date hereof, provided that a Person shall be deemed to be the
          beneficial owner of, and to have beneficial ownership of, Company
          Shares that such Person or any Affiliate of such Person has the right
          to acquire (whether such right is exercisable immediately or only
          after the passage of time) pursuant to any agreement, arrangement or
          understanding or upon the exercise of conversion rights, exchange
          rights, warrant, options or otherwise.

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

               (v)    Person.  A "Person" shall mean any individual, firm,
                      ------                                              
          corporation, partnership, trust, limited liability company or other
          entity.

               (vi)   Significant Subsidiary.  "Significant Subsidiary" shall 
                      ----------------------        
          have the meaning ascribed to it in Rule 1-02 of SEC Regulation S-X as
          in effect on the date hereof.

          (g)  Due Authorization; No Conflicts.  The Stockholders hereby
               -------------------------------                          
     represent and warrant to the Acquiror as follows:  The Stockholders have
     full power and authority to enter into this Agreement; neither the
     execution or delivery of this Agreement nor the consummation of the
     transactions contemplated herein will (a) conflict with or result in a
     breach, default or violation of (i) any of the terms, provisions or
     conditions of the certificate of incorporation or bylaws of any member of
     the Stockholder Group or (ii) any agreement, proxy, document, instrument,
     judgment, decree, order, governmental permit, certificate, license, law,
     statute, rule or regulation to which any member of the Stockholder Group is
     a party or to which it is subject, (b) result in the creation of any lien,
     charge or other encumbrance on any shares of Company Common Stock or (c)
     require any member of the Stockholder Group to obtain the consent of any
     private nongovernmental third party; no consent, action, approval or
     authorization of, or regis tration, declaration or filing with, any
     governmental department, commission, agency or other instrumentality or any
     other person or entity is required to authorize, or is otherwise required
     in connection with, the execution and delivery of this Agreement (with the
     exception of an Amended Schedule 13D to be filed by the Stockholders
     pursuant to the Securities Exchange Act of 1934, as amended) or the
     Stockholders' performance of the terms of this Agreement or the validity or
     enforceability of this Agreement; neither Stockholder has any plan or
     intention to sell or otherwise dispose of any shares of Acquiror Common
     Stock to be received by the undersigned pursuant to the Merger.

          (h)  Successors and Assigns.  This Agreement shall be binding upon, 
               ----------------------      
     and inure to the benefit of, the parties hereto and their respective heirs,
     personal representatives,

                               Voting Agreement

                                      -4-
<PAGE>
 
     successors, assigns and Affiliates, but shall not be assignable by either
     party hereto without the prior written consent of the other party hereto.

          (i)  Waiver.  No party may waive any of the terms or conditions of 
               ------     
     this Agreement except by a duly signed writing referring to the specific
     provision to be waived.

          (j)  Governing Law.  This Agreement shall be governed by, and
     construed in accordance with, the laws of the State of Texas, regardless of
     the laws that might otherwise govern under applicable principles of
     conflicts of law; provided, however, that any matter involving the internal
     corporate affairs of any party hereto shall be governed by the provisions
     of the General Corporation Law of the State of Delaware.

          (k)  Entire Agreement.  This Agreement constitutes the entire 
               ----------------  
     agreement and supersedes all other and prior agreements and understandings,
     both written and oral, among the parties hereto and their Affiliates.

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

                               Voting Agreement

                                      -5-
<PAGE>
 
     IN WITNESS WHEREOF, the Stockholders have each executed this Agreement and
the Acquiror has caused this Agreement to be duly executed by an officer,
thereunto duly authorized, all as of the day and year first above written.

                                         HALLIBURTON COMPANY


                                         By:____________________________________
                                            Lester L. Coleman
                                            Executive Vice President and
                                            General Counsel


                                         STOCKHOLDERS


                                         _______________________________________
                                         S. Rutt Bridges

                                         _______________________________________
                                         Barbara Ann Bridges

                               Voting Agreement

                                      -6-

<PAGE>
 
                                                                    EXHIBIT 99.3

                                FIRST AMENDMENT

                                       to

                                RIGHTS AGREEMENT

                                 by and between

                         LANDMARK GRAPHICS CORPORATION

                                      and

                                 CHEMICAL BANK

                                       as

                                  Rights Agent


     This First Amendment ("First Amendment"), dated as of June 30, 1996,
evidences the amendment of that certain Rights Agreement (herein so called) by
and between Landmark Graphics Corporation (the "Company") and Chemical Bank as
Rights Agent, dated as of September 1, 1995.

                                    RECITALS

     Section 27 of the Rights Agreement provides that the Board of Directors of
the Company may, pursuant to Continuing Board Action (as defined in the Rights
Agreement), from time to time supplement or amend the Rights Agreement in such
manner as the Board of Directors deems necessary or desirable.

     The Company, Halliburton Company, a Delaware corporation ("Halliburton"),
and Halliburton Acq. Company, a Delaware corporation and a wholly-owned
subsidiary of Halliburton ("Halliburton Acq. Company"), intend to  enter into
that certain Agreement and Plan of Merger (the "Agreement and Plan of Merger")
pursuant to which the Company will be merged with and into Halliburton Acq.
Company and thereby become a wholly owned subsidiary of Halliburton.

     The Board of Directors of the Company has unanimously approved this First
Amendment.

     NOW, THEREFORE, in consideration of the premises and the mutual agreements
herein set forth, the parties hereby agree as follows:

     1.  Section 1(a) of the Rights Agreement is hereby amended to modify the
definition of "Acquiring Person" by adding a sentence to the end of such
definition as follows:
<PAGE>
 
     "Notwithstanding anything to the contrary stated herein, neither
     Halliburton Company nor Halliburton Acq. Company shall be deemed to be an
     Acquiring Person to the extent, and only to the extent, (i) Halliburton
     Company and/or Halliburton Acq. Company acquire Common Shares pursuant to
     the transactions contemplated by the Agreement and Plan of Merger or the
     Stock Option Agreement or (ii) Landmark is merged into Halliburton Acq.
     Company pursuant to the Agreement and Plan of Merger."

     2.   Section 1 of the Rights Agreement shall be further revised by adding
the following additional definitions thereto:

     "AGREEMENT AND PLAN OF MERGER" shall mean that certain Agreement and Plan
     of Merger to be entered into by and among Halliburton Company, Halliburton
     Acq. Company and the Company.

     "HALLIBURTON COMPANY" shall mean Halliburton Company, a Delaware
     corporation.

     "HALLIBURTON ACQ. COMPANY" shall mean Halliburton Acq. Company, a Delaware
     corporation.

     "STOCK OPTION AGREEMENT" shall mean that certain Stock Option Agreement to
     be entered into by and between Halliburton Company and the Company.

     3.   This First Amendment shall be deemed to be a contract made under the
laws of the State of Delaware and for all purposes shall be governed by and
construed in accordance with the laws of the State of Delaware applicable to
contracts to be made and performed entirely within the State of Delaware.

     4.   This First Amendment may be executed in any number of counterparts and
each of such counterparts shall for all purposes be deemed to be an original,
and all such counterparts shall together constitute but one and the same
instrument.

     5.   Except to the extent expressly amended by the First Amendment, the
Rights Agreement shall remain in full force and effect.
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed and attested, all as of the day and year first above written.


                                    LANDMARK GRAPHICS CORPORATION



Attest:


By:__________________________       By:_________________________________
Title:_______________________       Title:______________________________



                                    CHEMICAL BANK



Attest:


By:__________________________       By:_________________________________
Title:_______________________       Title:______________________________


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