LANDMARK GRAPHICS CORP
10-Q, 1996-05-13
COMPUTER INTEGRATED SYSTEMS DESIGN
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<PAGE>   1
================================================================================

                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                            Washington, D.C.  20549

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

                                   FORM 10-Q
 (Mark One)
 [X]       QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE
                       SECURITIES EXCHANGE ACT OF 1934

                FOR THE QUARTERLY PERIOD ENDED MARCH 31, 1996

                                     OR

 [ ]       TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (D) OF THE
                           SECURITIES ACT OF 1934

                        COMMISSION FILE NUMBER  0-17195

                         Landmark Graphics Corporation
             (Exact name of Registrant as specified in its charter)

          DELAWARE                                        76-0029459
(State or other jurisdiction of             (I.R.S. Employer Identification No.)
incorporation or organization)                                                  
                             
        15150 MEMORIAL DRIVE                              77079-4304
           HOUSTON, TEXAS                                 (Zip Code)
(Address of principal executive office)

                                 (713) 560-1000
              (Registrant's telephone number, including area code)

                                 NOT APPLICABLE
  (Former name, former address and former fiscal year, if changed since last
                                    report)

Indicate by check mark whether the Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
Registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.

                             YES   X            NO
                                 -----             -----

The number of shares outstanding of the Registrant's common stock, $0.05 par
value, as of May 1, 1996, was 17,260,896.

================================================================================
<PAGE>   2
                                     INDEX



                         PART I:  FINANCIAL INFORMATION

<TABLE>
<S>                                                                                               <C>
ITEM 1.  FINANCIAL STATEMENTS

    Consolidated Balance Sheets -
         As of March 31, 1996 and June 30, 1995 . . . . . . . . . . . . . . . . . .                1


    Consolidated Statements of Operations -
         For the Three Months and Nine Months Ended March 31, 1996
         and 1995 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                2


    Consolidated Statements of Cash Flows -
         For the Nine Months Ended March 31, 1996 and 1995  . . . . . . . . . . . .                3


    Notes to Consolidated Financial Statements  . . . . . . . . . . . . . . . . . .                4


ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                         CONDITION AND RESULTS OF OPERATIONS  . . . . . . . . . . .                9



                                               PART II:  OTHER INFORMATION


ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K . . . . . . . . . . . . . . . . . . . . .               16


    Signatures  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               17
</TABLE>
<PAGE>   3
                         LANDMARK GRAPHICS CORPORATION
                          CONSOLIDATED BALANCE SHEETS
                     (IN THOUSANDS, EXCEPT PAR VALUE DATA)


<TABLE>
<CAPTION>
                                                                        March 31,             June 30,
                                                                          1996                  1995
                                                                        ---------            ---------
                                                                        (Unaudited)
<S>                                                                     <C>                  <C>
                               ASSETS

Current assets:
Cash and cash equivalents . . . . . . . . . . . . . . . . . . .         $  55,028            $  64,099
Receivables:
   Trade accounts receivable, net of allowance  . . . . . . . .            47,003               51,984
   Current income tax receivable  . . . . . . . . . . . . . . .               873                1,003
   Accrued revenue and other receivables  . . . . . . . . . . .             8,456                7,838
Inventory . . . . . . . . . . . . . . . . . . . . . . . . . . .             4,153                4,340
Prepaid expenses  . . . . . . . . . . . . . . . . . . . . . . .             5,474                3,004
Deferred income taxes . . . . . . . . . . . . . . . . . . . . .             3,837                3,847
                                                                        ---------            ---------
     Total current assets . . . . . . . . . . . . . . . . . . .           124,824              136,115
Property and equipment, net . . . . . . . . . . . . . . . . . .            47,642               47,503
Software development costs, net . . . . . . . . . . . . . . . .            11,031                7,932
Intangibles, net  . . . . . . . . . . . . . . . . . . . . . . .            22,876               11,949
Other long-term assets, net . . . . . . . . . . . . . . . . . .             7,009                7,652
                                                                        ---------            ---------
Total Assets  . . . . . . . . . . . . . . . . . . . . . . . . .         $ 213,382            $ 211,151
                                                                        =========            =========
            LIABILITIES AND COMMON STOCKHOLDERS' EQUITY

Current liabilities:
  Accounts payable  . . . . . . . . . . . . . . . . . . . . . .         $  13,867            $   9,488
  Accrued liabilities . . . . . . . . . . . . . . . . . . . . .            13,029               10,823
  Deferred maintenance fees . . . . . . . . . . . . . . . . . .            19,530               14,597
  Income taxes payable  . . . . . . . . . . . . . . . . . . . .               121                2,683
  Current maturities of long-term debt  . . . . . . . . . . . .                 -                1,007
                                                                        ---------            ---------
     Total current liabilities  . . . . . . . . . . . . . . . .            46,547               38,598
Deferred income taxes . . . . . . . . . . . . . . . . . . . . .             2,590                2,590
Long-term debt  . . . . . . . . . . . . . . . . . . . . . . . .                 -               11,000
Other long-term liabilities . . . . . . . . . . . . . . . . . .             2,943                   65
                                                                        ---------            ---------
Total Liabilities . . . . . . . . . . . . . . . . . . . . . . .            52,080               52,253
                                                                        ---------            ---------
Common stockholders' equity:
  Common stock, $0.05 par value; 17,498 shares issued and 17,260
    outstanding at March 31, 1996, and 17,086 shares issued and
    outstanding at June 30, 1995  . . . . . . . . . . . . . . .               875                  854
  Paid-in capital . . . . . . . . . . . . . . . . . . . . . . .           128,419              122,407
  Retained earnings . . . . . . . . . . . . . . . . . . . . . .            36,143               35,637
  Treasury stock  . . . . . . . . . . . . . . . . . . . . . . .           (4,135)                    -    
                                                                        ---------            ---------
       Total common stockholders' equity  . . . . . . . . . . .           161,302              158,898
                                                                        ---------            ---------
Total Liabilities and Common Stockholders' Equity . . . . . . .         $ 213,382            $ 211,151
                                                                        =========            =========
</TABLE>

   The accompanying notes are an integral part of these financial statements





                                       1
<PAGE>   4
                         LANDMARK GRAPHICS CORPORATION
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
                                  (UNAUDITED)


<TABLE>
<CAPTION>
                                                             Three Months Ended          Nine Months Ended
                                                                  March 31,                   March 31,
                                                           -----------------------    ------------------------
                                                              1996        1995           1996          1995
                                                           ---------    ---------     ---------     ----------
                                                                        (Restated)                  (Restated)
<S>                                                        <C>          <C>           <C>           <C>
Revenue:
  Software product sales  . . . . . . . . . . . . .        $  18,887    $  22,634     $  57,623     $  59,553
  Hardware product sales  . . . . . . . . . . . . .            5,875        8,368        22,155        23,611
  Services  . . . . . . . . . . . . . . . . . . . .           18,576       13,968        53,542        38,821
                                                           ---------    ---------     ---------     ---------
    Total revenue . . . . . . . . . . . . . . . . .           43,338       44,970       133,320       121,985

Cost of revenue:
  Cost of software product sales  . . . . . . . . .            2,287        2,879         7,144         7,295
  Cost of hardware product sales  . . . . . . . . .            5,480        6,683        19,908        19,327
  Cost of services  . . . . . . . . . . . . . . . .            9,823        7,850        27,237        23,220
                                                           ---------    ---------     ---------     ---------
    Total cost of revenue . . . . . . . . . . . . .           17,590       17,412        54,289        49,842
                                                           ---------    ---------     ---------     ---------
      Gross profit  . . . . . . . . . . . . . . . .           25,748       27,558        79,031        72,143

Operating expenses:
  Research and development  . . . . . . . . . . . .            6,253        5,165        16,362        14,229
  Selling, marketing and administrative . . . . . .           16,488       15,295        48,952        42,631
  Acquired research and development costs . . . . .           11,250        3,700        11,250         3,700
  Restructuring, merger and other costs . . . . . .            1,000            -         4,172         2,962
                                                           ---------    ---------     ---------     ---------
    Total operating expenses  . . . . . . . . . . .           34,991       24,160        80,736        63,522
                                                           ---------    ---------     ---------     ---------
Income (loss) from operations . . . . . . . . . . .           (9,243)       3,398        (1,705)        8,621
Other, net  . . . . . . . . . . . . . . . . . . . .              811          898         2,671         2,548
                                                           ---------    ---------     ---------     ---------
Income (loss) before income taxes . . . . . . . . .           (8,432)       4,296           966        11,169
Provision (benefit) for income taxes  . . . . . . .           (2,464)       1,107           261         3,189
                                                           ---------    ---------     ---------     ---------
Net income (loss) . . . . . . . . . . . . . . . . .        $  (5,968)   $   3,189     $     705     $   7,980
                                                           =========    =========     =========     =========
Income (loss) per common and common equivalent
share . . . . . . . . . . . . . . . . . . . . . . .        $   (0.34)   $    0.18     $    0.04     $    0.46
                                                           =========    =========     =========     =========
Weighted average common and common equivalent
shares outstanding .  . . . . . . . . . . . . . . .           17,426       17,370        17,854        17,416
</TABLE>





   The accompanying notes are an integral part of these financial statements.





                                       2
<PAGE>   5
                         LANDMARK GRAPHICS CORPORATION
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                             (AMOUNTS IN THOUSANDS)
                                  (UNAUDITED)


<TABLE>
<CAPTION>
                                                                                          Nine Months Ended
                                                                                               March 31,
                                                                                       -------------------------
                                                                                         1996             1995
                                                                                       --------        ---------
                                                                                                       (Restated)
<S>                                                                                    <C>             <C>
Cash flows from operating activities:                                                                             
   Net income                                                                          $    705        $   7,980
    Adjustments to reconcile net income to net cash provided
      by operating activities:
       Acquired research and development  . . . . . . . . . . . . . . . . . . . . .      11,250            3,700
       Depreciation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       9,536            6,160
       Amortization of goodwill/other assets  . . . . . . . . . . . . . . . . . . .       1,508              904
       Amortization of capitalized software development costs . . . . . . . . . . .       2,655            2,349
       Restructuring charges/asset write-downs  . . . . . . . . . . . . . . . . . .       2,078                -
       Other  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       2,068            2,231
   Changes in assets and liabilities, net of the effects of purchased businesses:
      Receivables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       2,740           (2,233)
      Inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          10           (1,836)
      Prepaid expenses  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      (1,272)             122
      Other assets  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       1,014             (579)
      Accounts payable/accrued liabilities. . . . . . . . . . . . . . . . . . . . .       3,661            3,312
      Deferred maintenance fees . . . . . . . . . . . . . . . . . . . . . . . . . .       1,763           (2,015)
      Deferred income taxes/income taxes payable  . . . . . . . . . . . . . . . . .      (2,161)           1,097
                                                                                       --------        ---------
       Net cash provided by operating activities. . . . . . . . . . . . . . . . . .      35,555           21,192
                                                                                       --------        ---------
Cash flows from investing activities:
      Capital expenditures  . . . . . . . . . . . . . . . . . . . . . . . . . . . .     (10,564)         (10,205)
      Payment for business acquisitions, net of cash acquired   . . . . . . . . . .     (16,159)         (19,203)
      Capitalized software development costs  . . . . . . . . . . . . . . . . . . .      (4,358)          (2,501)
      Payment of guaranteed purchase price  . . . . . . . . . . . . . . . . . . . .      (1,808)               -
      Investment in equity securities . . . . . . . . . . . . . . . . . . . . . . .           -               (6)
      Proceeds from sale of property and equipment. . . . . . . . . . . . . . . . .          21              160
                                                                                       --------        ---------
       Net cash used in investing activities. . . . . . . . . . . . . . . . . . . .     (32,868)         (31,755)
                                                                                       --------        ---------
Cash flows from financing activities:
      Reductions of debt  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     (12,007)          (1,443)
      Proceeds from exercise of stock options . . . . . . . . . . . . . . . . . . .       6,055            1,333
      Acquisitions of treasury stock  . . . . . . . . . . . . . . . . . . . . . . .      (5,806)               -
      Distributions to pooled entities stockholders . . . . . . . . . . . . . . . .           -             (825)
                                                                                       --------        ---------
       Net cash used in financing activities  . . . . . . . . . . . . . . . . . . .     (11,758)            (935)
                                                                                       --------        ---------

Net increase (decrease) in cash and cash equivalents  . . . . . . . . . . . . . . .      (9,071)         (11,498)
Cash and cash equivalents at beginning of period  . . . . . . . . . . . . . . . . .      64,099           74,695
                                                                                       --------        ---------
Cash and cash equivalents at end of period  . . . . . . . . . . . . . . . . . . . .    $ 55,028        $  63,197
                                                                                       ========        =========
</TABLE>

   The accompanying notes are an integral part of these financial statements.



                                       3
<PAGE>   6
                         LANDMARK GRAPHICS CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

BASIS OF PRESENTATION OF INTERIM FINANCIAL STATEMENTS

         The accompanying unaudited consolidated financial statements of
Landmark Graphics Corporation and subsidiaries (the "Company" or "Landmark")
have been prepared pursuant to the rules and regulations of the Securities and
Exchange Commission. Accordingly, certain information and footnote disclosures
normally included in financial statements prepared in accordance with generally
accepted accounting principles have been condensed or omitted. Unless the
context otherwise requires, the term "Landmark" refers to Landmark Graphics
Corporation and the term "Company" refers to Landmark and its subsidiaries.
These financial statements should be read in conjunction with the audited
financial statements and accompanying notes included in the Company's 1995
Annual Report on Form 10-K.

         The consolidated financial statements for the three-month and
nine-month periods ended March 31, 1995 have been restated to give effect to
acquisitions which have been accounted for as poolings of interests (see
"Acquisitions" below).

         The unaudited consolidated financial statements reflect all
adjustments (consisting only of normal recurring adjustments) which the Company
considers necessary for a fair statement of the results of the interim periods
presented.  Results for the three-month and nine-month periods ended March 31,
1996, are not necessarily indicative of results for the fiscal year ending
June 30, 1996.  All significant intercompany balances and transactions have been
eliminated.

         Certain prior year amounts have been reclassified to conform to the
current year presentation.

ACQUISITIONS

Western Atlas International, Inc.

         On March 29, 1996, the Company purchased certain assets and assumed
certain liabilities of Western Atlas International, Inc. ("WAII") of Houston,
Texas in exchange for cash consideration of approximately $12.1 million. The
Company also incurred accounting, legal and investment banking costs of
approximately $750,000 related to the acquisition.  The assets acquired
primarily consisted of oil and gas exploration and production software
applications as well as in-process research and development activities. The
acquisition was accounted for using the purchase method of accounting and,
accordingly, the acquired operations have been included in the results of
operations since the date of acquisition and were not material.

Verticomp, Inc.

         In September, 1995, the Company entered into a note purchase agreement
with Verticomp, Inc. ("Verticomp"), a Houston, Texas-based company. The note
purchase agreement granted the Company the option to purchase certain assets
and assume certain liabilities of Verticomp in exchange for cash consideration
of approximately $650,000.  On January 1, 1996, the Company exercised the
option. Assets acquired primarily consisted of oil and gas production software 
applications as well as in-process research and development activities.  The 
acquisition





                                       4
<PAGE>   7
was accounted for using the purchase method of accounting and, accordingly, the
acquired operations have been included in the results of operations since the
date of acquisition and were not material.

Tech Logic, Inc.

         On September 20, 1995, the Company acquired all of the outstanding
common stock of Tech Logic, Inc. ("Tech Logic"), a Woodinville,
Washington-based company.  Tech Logic has developed an interactive, integrated
3D geological modeling system known as IREX.

         In connection with the acquisition, the Company issued a total of
74,637 shares of its Common Stock in exchange for all of the outstanding common
stock of Tech Logic in a transaction accounted for as a pooling of interests.
Due to the immateriality of this transaction and its effect on the historical
consolidated financial statements of the Company for prior periods, those
statements have not been restated to reflect the operating results and
financial condition of Tech Logic.

GeoGraphix, Inc.

         On June 5, 1995, the Company acquired all of the outstanding common
stock of GeoGraphix, Inc. ("GeoGraphix"), a Denver, Colorado-based company, in
a transaction accounted for as a pooling of interests and, accordingly, the
consolidated financial statements for the three-month and nine-month periods
ended March 31, 1995 have been restated to include the accounts of GeoGraphix.

DRD Corporation

         On February 28, 1995, the Company purchased certain assets and assumed
certain liabilities of DRD Corporation ("DRD") of Tulsa, Oklahoma in exchange
for cash consideration of approximately $5.8 million. The Company also incurred
accounting, legal and investment banking costs of approximately $600,000
related to the acquisition.  The assets acquired primarily consisted of
drilling and completion engineering software applications as well as in-process
research and development activities. The acquisition was accounted for using
the purchase method of accounting and, accordingly, the acquired operations
have been included in the results of operations since the date of acquisition.

MGI Associates, Inc.

         On September 29, 1994, the Company purchased all the issued and
outstanding capital stock of MGI Associates, Inc., ("MGA"), a company based in
Dallas, Texas, which develops personal computer-based economics and reservoir
engineering software products designed to aid asset teams, including production
and drilling engineers, in oil and gas exploration.  The Company acquired MGA
for initial consideration of approximately $13.3 million which consisted of
cash of $10.5 million paid to acquire the stock, $1.2 million paid to retire
certain related party debt and approximately $1.6 million of acquisition
related costs. The acquisition was accounted for using the purchase method of
accounting and, accordingly, the acquired operations have been included in the
results of operations since the date of acquisition.





                                       5
<PAGE>   8
         Under the terms of the original MGA acquisition agreement, the Company
was obligated to make earn-out payments, based upon the financial performance
of MGA, over a period of four years with a net present value (as of July 1,
1994) of up to $6.0 million. On September 29, 1995, the stock purchase
agreement was amended to guarantee a total earn-out of $6.9 million payable
over a three-year period starting September 30, 1995.

         Originally, in connection with the MGA transaction, the Company
acquired an option to purchase the equity interests of a corporation owned by
certain of the former shareholders of MGA ("Argus") in exchange for a $3.0
million line of credit guarantee. On April 29, 1996, this option agreement was
terminated and the Company was assigned ownership of certain software previously
owned by Argus. The Company's guarantee of the $3.0 million line of credit
remains in effect. The Company is currently making interest payments on behalf
of Argus and could be called upon to perform on the guarantee.

Stratamodel, Inc.

         On September 28, 1994, the Company acquired all of the equity
interests of Stratamodel, Inc. ("Stratamodel"), a Houston, Texas-based company,
in a transaction accounted for as a pooling of interests.

         Stratamodel's reservoir characterization and modeling software
products are designed to aid geoscientists in oil and gas exploration and
production.  In connection with the acquisition, the Company issued a total of
413,911 shares of its Common Stock in exchange for all of the equity interests
of Stratamodel, which included common stock, stock options and warrants.  In
addition, the Company retired all of Stratamodel's outstanding debt of
approximately $510,000 and paid certain acquisition-related expenses of
Stratamodel of approximately $293,000.

SOFTWARE DEVELOPMENT COSTS

          In addition to the $4.4 million of software development costs
capitalized during the nine months ended March 31, 1996, the Company recorded
approximately $1.5 million of software development costs in connection with the
Western Atlas purchase.  The amounts recorded in connection with the purchase
reflect the estimated fair market value to the Company of the software
acquired.

INTANGIBLES

         Intangibles consist primarily of goodwill, which represents the cost
in excess of the fair market value of the net assets of companies acquired and
is being amortized on a straight-line basis over a period of eight to twelve
years.  During the nine months ended March 31, 1996, the Company recorded
goodwill in connection with Western Atlas and Verticomp acquisitions of
approximately $5.2 million and recorded $6.9 million of guaranteed purchase
payments for the MGA acquisition.

LONG-TERM DEBT

          In October 1995, the Company paid in full the amounts outstanding
under its term loan and existing credit facility.  On December 15, 1995, the
Company terminated its $25.0 million





                                       6
<PAGE>   9
credit facility and entered into a $100.0 million revolving credit agreement
with a syndicate of seven banks.  The term of this credit facility is three
years.

         The agreement contains certain restrictive and financial covenants,
including those related to indebtedness, net worth and fixed charges, and
provides for guarantees by certain subsidiaries of Landmark.  At March 31,
1996, there were $2.7 million in letters of credit and no revolving loans
outstanding under this facility, and the Company was in compliance with the
loan covenants.

ACQUIRED RESEARCH AND DEVELOPMENT

         Acquired research and development costs for the three-month and
nine-month periods ended March 31, 1996 relate to in-process research and
development activities acquired in connection with the purchase of certain
assets and assumption of certain liabilities of WAII and of Verticomp.  The
Company evaluated the status of those acquired development activities and
determined that certain projects require further development by the Company,
had not reached technological feasibility under the Company's software
development plans and did not have alternative future uses to the Company.  The
Company performed a separate valuation of the replacement cost of these
activities and determined the replacement cost related to the activities of
WAII approximated $11.0 million.  The replacement cost related to the
in-process research and development activities of Verticomp was determined to
approximate $250,000.

         In the periods ended March 31, 1995, acquired research and development
costs relate to in-process research and development activities acquired in
connection with the DRD purchase.  The Company determined the replacement cost
of these activities was approximately $3.7 million.

RESTRUCTURING, MERGER AND OTHER COSTS

         In the three-month period ended March 31, 1996, the Company recorded
merger, restructuring and other non-recurring charges of $1.0 million. The
charge reflects the write-off of redundant assets and activities, including
capitalized software of the Company, that would be replaced by the acquired WAII
applications.

         In July 1995, the Company completed a strategic planning process which
concluded with the decision to proactively realign resources.  A restructuring
charge of $3.1 million is included in the results of operations for the nine
months ended March 31, 1996 to reflect severance costs for terminated
employees, facility consolidation and write-down of certain assets of the
Company.

         Merger costs in the prior year of $1.2 million consisted of advisor
costs in connection with the Stratamodel acquisition. Related to the
Stratamodel acquisition, the Company adopted a restructuring plan designed to
eliminate redundancies and consolidate operations.  Under the plan, the Company
recorded approximately $1.2 million in restructuring charges consisting of
severance costs for terminated employees and lease costs associated with
duplicate facilities.  Additionally, non-recurring charges of approximately
$600,000 were incurred in connection with the acquisition, including relocation
and other acquisition-related costs.





                                       7
<PAGE>   10
INCOME (LOSS) PER COMMON AND COMMON EQUIVALENT SHARE

         Income (loss) per common and common equivalent share is computed using
the weighted average number of shares of common stock and common stock
equivalents outstanding during the period.  Common stock equivalents include
the number of shares issuable upon exercise of stock options, less the number
of shares that could have been repurchased with the exercise proceeds using the
treasury stock method.  In the case of a net loss, no shares are assumed to be
issued upon exercise of stock options because such shares would have an
antidilutive effect on the calculation.

         For purposes of the income per share computation, the shares issued in
exchange for the equity interests of pooled entities have been treated as if
they had been issued and outstanding for all periods presented.

CASH FLOW INFORMATION

         Net cash provided by operating activities reflects cash payments for
interest and income taxes as follows (in thousands) (unaudited):

<TABLE>
<CAPTION>
                                                                          Nine  Months Ended
                                                                               March 31,
                                                                        ----------------------
                                                                          1996          1995
                                                                        --------    ----------
                                                                                    (Restated)
         <S>                                                            <C>          <C>
         Income taxes  . . . . . . . . . . . . . . . . . . . . . .      $  1,656     $  1,358
         Interest  . . . . . . . . . . . . . . . . . . . . . . . .      $    404     $    771
</TABLE>

         During the nine-month periods ended March 31, 1996 and 1995, there
were non-cash financing activities of $1.4 million and $356,000, respectively,
relating to tax benefits received from the exercise of non-qualified stock
options by employees.

TREASURY STOCK

         On November 6, 1995, Landmark's Board of Directors approved a plan for
the Company to repurchase shares of its Common Stock on the open market.  The
repurchase program is intended to minimize the dilutive effects of the
Company's employee stock option program on the Company's earnings per share.
During the nine-month period ended March 31, 1996, the Company repurchased
320,000 shares of its Common Stock, of which 82,000 shares have been reissued
upon the exercise of employee stock options.

OTHER
         In December 1995, ten of Landmark's officers executed severance
agreements that would be invoked upon a change in control of the Company.





                                       8
<PAGE>   11
ITEM 2   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
         CONDITION AND RESULTS OF OPERATIONS

GENERAL

         Management's Discussion and Analysis of Financial Condition and
Results of Operations ("MD&A") is the Company's analysis of its financial
performance and of significant trends which may impact future performance.  It
should be read in conjunction with the consolidated financial statements of the
Company and the related notes thereto.  Certain of the statements made in the
Company's MD&A are forward looking statements related to the transition to
integrated solution sales based on current expectations that involve a number of
risks and uncertainties.  The factors that could cause actual results to differ
materially include the following:  unanticipated delays in implementation/
transition to delivery of integrated solutions; lack of customer acceptance of
integrated solutions delivery; uncertainty in oil and gas markets; competitive
factors and pricing pressures; timing of development and acceptance of new
product/services releases; technical obsolescence of the Company's products/
services; inability to recruit required sales management, marketing and
consulting personnel; and the risks detailed from time to time in the Company's
SEC reports, including the Form 8-K filed on April 2, 1996 that identifies
certain of these important risk factors.

         The Company, incorporated in 1982, designs, markets and supports
software, services and systems which are used in exploration and production
efforts of oil and gas companies worldwide.  The Company derives revenue from
licensing software products, providing related professional and consulting
services, and reselling hardware.  In most instances, customers pay the Company
an initial license fee for the software.  Generally, revenue from software and
hardware product sales is recognized by the Company upon shipment.  Customers
have the option to pay an annual maintenance fee, calculated as a percentage of
current list price, which entitles them to routine support and product updates.
The Company generally recognizes revenue related to customer support agreements
ratably over the contract period.

         Many of the Company's customers are shifting from functional
organizations to interdisciplinary teams, which is creating the need for
integrated products and service sales.  Accordingly, the Company's sales,
marketing and support organizations are currently being reconfigured to better
address the emerging "solutions" market.  These solution sales have the longer
term potential of generating larger contracts and more recurring revenue;
however, they can also lengthen customers' decision-making processes. The
Company believes that its competitors are dealing with similar changes in their
sales and marketing organizations.

         The transition of the Company's sales organization may continue
throughout the fourth quarter of fiscal year 1996 and late through the fiscal 
year 1997.  The transition includes recruiting additional professional sales
management, strengthening market capabilities, as well as building a
professional and technical consulting organization.  This transition may have a
negative impact on the Company's growth during this period but should position
the Company for the ongoing prospects that the market has to offer over the
longer term. The Company believes it is very unlikely that it will generate
positive earnings growth for the 1996 fiscal year.

         On March 29, 1996, the Company acquired the general application
software operations of Western Atlas International, Inc. ("WAII") recorded
under the purchase method of accounting.  On September 20, 1995, the Company
acquired all of the outstanding common stock of Tech





                                       9
<PAGE>   12
Logic, Inc. ("Tech Logic") in an acquisition accounted for as a pooling of
interests.  On June 5, 1995, the Company acquired all of the outstanding common
stock of GeoGraphix, Inc. ("GeoGraphix") in an acquisition accounted for as a
pooling of interests. On February 28, 1995, the Company purchased certain
assets and assumed related liabilities of DRD Corporation ("DRD") in an
acquisition accounted for as a purchase.  On September 29, 1994, the Company
acquired all of the outstanding common stock of MGI Associates, Inc. ("MGA") in
an acquisition accounted for as a purchase.  On September 28, 1994, the Company
acquired all of the equity interests of Stratamodel, Inc. ("Stratamodel") in an
acquisition accounted for as a pooling of interests.  Accordingly, the
Company's consolidated financial statements included elsewhere herein give
effect to the acquisitions accounted for as pooling of interests (other than
Tech Logic) for all periods presented and include the results of acquired
operations accounted for as purchases and Tech Logic since the dates of
acquisition.  The following discussion should be read in conjunction with the
Company's consolidated financial statements and the related notes thereto.


RESULTS OF OPERATIONS -   FOR THE THREE MONTHS ENDED MARCH 31, 1996 AND 1995

         Total revenue.  Total revenue for the third quarter of fiscal 1996
("Current Quarter") decreased approximately $1.6 million, or four percent, as
compared with the third quarter of fiscal 1995 ("Comparable Quarter").  The
decrease is primarily due to a 20 percent reduction in software and hardware
product revenue, offset in part by a 33 percent increase in services revenue.
International revenue comprised 47 percent of total revenue for the Current
Quarter compared to 59 percent for the Comparable Quarter.

         Software product sales.  Software product sales consist of licensing
fees for the Company's proprietary and third party software.  Software product
sales decreased approximately $3.7 million, or 17 percent, from the Comparable
Quarter.  The decrease in software sales is mainly due to the lower revenues in
the Current Quarter from geophysical application sales.  Software product
revenue as a percentage of total revenue decreased from the Comparable Quarter.
The Company expects that this revenue should continue to be a significant but
declining portion of total revenue.  Future growth in software product sales is
partly dependent upon the Company's ability to bring innovative software
products to the market ahead of its competitors.

         Hardware product sales.  Hardware product sales relate to the resale
of third party computer hardware.  Hardware product sales decreased
approximately $2.5 million, or 30 percent, from the Comparable Quarter.  During
the Comparable Quarter, a large international order that contained a
significant hardware component contributed to the higher hardware product
revenue in that quarter.

         Services.  Services revenue relates to maintenance and support of the
Company's hardware and software products, and increasingly from revenue from a
variety of other professional services, including implementation, consulting
and integration of applications, offered to customers.  Services revenue
increased approximately $4.6 million, or 33 percent, in the Current Quarter
from the Comparable Quarter.  This increase is primarily attributable to a 25
percent increase in maintenance support sales and a 55 percent increase in
professional services revenue.  This increase in services revenue reflects the
Company's strategy to develop additional sources of recurring revenue streams.





                                       10
<PAGE>   13
         Cost of software product sales.  Cost of software product sales as a
percentage of software product sales was 12 percent in the Current Quarter as
compared with 13 percent in the Comparable Quarter.  As the Company develops
and releases new products or embeds third party software within its own
software, software product costs and the related amortization may continue
to increase and could negatively affect the Company's software product margin.

         Cost of hardware product sales.  Cost of hardware product sales as a
percentage of hardware product sales increased to 93 percent in the Current
Quarter compared to 80 percent in the Comparable Quarter.  The lower cost as
percentage of hardware product revenue in the Comparable Quarter was mainly a
result of the large international order discussed in "Hardware product sales"
above and the corresponding higher margin involved.  In addition, the Company's
offering of sales discounts to customers in response to competitive pressures,
particularly in the United States market, negatively affected margins on
hardware product sales in the Current Quarter.  As price competitiveness in the
computer hardware industry persists, discounts and the resulting impact on
hardware product margins may continue.  Since hardware revenue now contributes
a lower margin, the Company primarily offers hardware sales to customers who
desire comprehensive system solutions.

         Cost of services.  Cost of services decreased as a percentage of the
related revenue from 56 percent in the Comparable Quarter to 53 percent in the
Current Quarter.  This decrease in cost as a percentage of revenue is mainly
attributable to the combination of higher revenues associated with the
expanding installed base with only a minimal increase in related cost, offset
by costs from the higher revenue from professional services, which have higher
associated costs.

         Research and development.  Research and development ("R&D") costs
increased $1.1 million, or 21 percent, in the Current Quarter compared to the
Comparable Quarter.  As a percentage of revenue, R&D costs were 14 percent for
the Current Quarter and 11 percent for the Comparable Quarter.  The Company
capitalized $1.6 million, or 20 percent, of total R&D costs during the Current
Quarter, as compared to $884,000, or 15 percent, of total R&D costs during the
Comparable Quarter.  The Company amortized $774,000 and $864,000 of capitalized
software costs in the Current Quarter and Comparable Quarter, respectively.

         Selling, marketing and administrative.  Selling, marketing and
administrative expenses increased approximately $1.2 million, or eight percent,
for the Current Quarter from the Comparable Quarter. As a percentage of total
revenue, these costs were 38 percent in the Current Quarter and 34 percent in
the Comparable Quarter.  The increase is primarily a result of increased
personnel costs associated with the transition of the sales, marketing and
support organizations to facilitate the emerging solutions market.

         Acquired research and development costs.  Acquired research and
development costs of $11.2 million for the Current Quarter relate primarily to
the in-process research and development activities acquired in connection with
the WAII acquisition.  The Company reviewed the status of the acquired research
and development activities and determined that certain projects require further
development by the Company, that technical feasibility had not been established
for certain of these activities under the Company's software development plans
and method to account for software development costs.  In addition to
determining whether technological feasibility had been reached, the Company
determined that these projects did not have alternative future uses to the
Company.  Therefore, a separate valuation of the replacement cost of these
activities was performed and resulted in a valuation of $11.0 million.  In
accordance with generally accepted accounting principles, this amount was
expensed at the date of the WAII acquisition. The Company expects to incur
approximately $4 to $5 million during the next 12 to 18 months to document, 
merge and embed the acquired code and development activities into products 
expected to be released in the future.





                                       11
<PAGE>   14
         In the Comparable Quarter, $3.7 million was expensed as acquired
research and development costs as a result of a similar evaluation performed in
connection with the purchase of certain assets of DRD.

         Restructuring, merger and other costs.   During the Current Quarter, a
charge of $1.0 million was recorded to reflect the write-off of redundant
assets and activities as a result of the WAII acquisition.  This charge
included approximately $500,000 for capitalized software that would be replaced
by acquired WAII applications and the remainder for personnel and related
costs.

         Taxes.  A benefit for income taxes of $2.5 million was recorded in the
Current Quarter as compared to a provision for income taxes of $1.1 million in
the Comparable Quarter.  The benefit for income taxes relates primarily to the
acquired research and development costs recorded in connection with the WAII
purchase.

RESULTS OF OPERATIONS -   FOR THE NINE MONTHS ENDED MARCH 31, 1996 AND 1995

         Total revenue.  Total revenue for the nine months ended March 31, 1996
("Current Period") increased approximately $11.3 million, or nine percent, as
compared with the nine months ended March 31, 1995 ("Comparable Period").  The
increase is primarily due to a 38 percent growth in services revenue.
International revenue comprised 52 percent of total revenue for the Current
Period compared to 58 percent for the Comparable Period.

         Software product sales.  Software product sales decreased
approximately $1.9 million, or three percent, from the Comparable Period.
Software product revenue as a percentage of total revenue decreased from the
Comparable Period.  The Company expects that this revenue should continue to be
a significant but declining portion of total revenue in the future.  The
decrease in software sales is mainly due to the lower revenue from geophysical
application sales offset by higher revenue from sales of production engineering
applications.

         Hardware product sales.  Hardware product sales relate to the resale
of third party computer hardware.  Hardware product sales decreased
approximately $1.5 million, or six percent, from the Comparable Period.  During
the Comparable Period, a large international order that contained a significant
hardware component contributed to the higher hardware product revenue in that
period.

         Services.  Services revenue increased approximately $14.7 million, or
38 percent, in the Current Period from the Comparable Period.  This increase is
primarily attributable to a 30 percent increase in maintenance support sales
and a 59 percent increase in professional services revenue.  This increase in
services revenue reflects the Company's strategy of developing additional
sources of recurring revenue streams.

         Cost of software product sales.  Cost of software product sales as a
percentage of software product sales was 12 percent in the both the Current
Period and Comparable Period.

         Cost of hardware product sales.  Cost of hardware product sales as a
percentage of hardware product sales increased  to 90 percent in the Current
Period compared to 82 percent in the Comparable Period. The lower cost as
percentage of hardware product revenue in the Comparable Period was a partially
a result of the large international order discussed in "Hardware





                                       12
<PAGE>   15
product sales" above and the corresponding higher margin involved.  In
addition, the Company's offering of sales discounts to customers in response to
competitive pressures, particularly in the United States market, negatively
affected margins on hardware product sales in the Current Period.  As price
competitiveness in the computer hardware industry persists, discounts and the
resulting impact on hardware product margins may continue. Since hardware
revenue now contributes a lower margin, the Company plans offers hardware sales
to customers who desire comprehensive system solutions.

         Cost of services.  Cost of services decreased as a percentage of the
related revenue from 60 percent in the Comparable Period to 51 percent in the
Current Period.  This decrease in cost as a percentage of revenue is mainly
attributable to the higher revenues associated with the expanding installed
base with only a minimal increase in related cost to provide these services.

         Research and development.  R&D cost increased $2.1 million, or 15
percent, in the Current Period compared to the Comparable Period.  As a
percentage of revenue, R&D costs were 12 percent for both the Current Period
and Comparable Period.  The Company capitalized $4.4 million, or 21 percent, of
total R&D costs during the Current Period, as compared to $2.5 million, or 15
percent, of total R&D costs during the Comparable Period.  The Company
amortized $2.7 million and $2.3 million of capitalized software costs in the
Current Period and Comparable Period, respectively.

         Selling, marketing and administrative.  Selling, marketing and
administrative expenses increased approximately $6.3 million, or 15 percent,
for the Current Period from the Comparable Period. As a percentage of total
revenue, these costs were 37 percent in the Current Period and 35 percent in
the Comparable Period.  The increase is primarily a result of increased
personnel costs associated with the transition of the sales, marketing and
support organizations and higher costs related to the Company's upgrade of its
information systems.  Amortization of goodwill increased $510,000 in the
Current Period compared to the Comparable Period.

         Acquired research and development costs.  Acquired research and
development costs of $11.2 million for the Current Quarter relate primarily to
the in-process research and development activities acquired in connection with
the WAII acquisition.  The Company reviewed the status of the acquired research
and development activities and determined that certain projects require further
development by the Company, that technical feasibility had not been established
for certain of these activities under the Company's software development plans
and method to account for software development costs.  In addition to
determining whether technological feasibility had been reached, the Company
determined that these projects did not have alternative future uses to the
Company.  Therefore, a separate valuation of the replacement cost of these
activities was performed and resulted in a valuation of $11.0 million.  In
accordance with generally accepted accounting principles, this amount was
expensed at the date of the WAII acquisition. The Company expects to incur
approximately $4 to $5 million during the next 12 to 18 months to document,
merge and embed the acquired code and development activities into products
expected to be released in the future.

         In the Comparable Period, $3.7 million was expensed as acquired
research and development costs as a result of a similar evaluation in
connection with the purchase of certain assets of DRD.

         Restructuring, merger and other costs.  In March 1996, a charge of
$1.0 million was recorded to reflect the write-off of redundant assets and
activities as a result of the WAII acquisition.  This charge included
approximately $500,000 for capitalized software that would be replaced by
acquired WAII applications and the remaining for personnel and related costs.
In July





                                       13
<PAGE>   16
1995, the Company completed a strategic planning process which concluded with
the decision to proactively realign its resources.  A restructuring charge of
$3.1 million was recorded in the Current Period to reflect severance costs for
terminated employees, facility consolidation and write-down of certain assets
of the Company.

         Merger costs of $1.2 million for the Comparable Period consisted of
advisor costs related to the acquisition of Stratamodel.  In connection with
the Stratamodel acquisition, the Company adopted a restructuring plan in the
Comparable Period designed to eliminate redundancies and consolidate
operations.  Under the plan, the Company accrued approximately $1.2 million of
severance costs for terminated Stratamodel employees and lease costs for
Stratamodel's facilities.  Additionally, $600,000 of non-recurring costs were
recorded for relocation costs and other acquisition related charges.

         Other, net. Other, net increased approximately $123,000, or five
percent, from the Comparable Period to the Current Period. This increase is due
mainly to lower interest expense due to the payoff of the term loan and credit
revolver in October 1995.

         Taxes.  Provisions for income taxes of $261,000 and $3.2 million were
recorded in the nine months ended March 31, 1996 and 1995, respectively.

FINANCIAL CONDITION AND LIQUIDITY

         Cash and cash equivalents decreased approximately $9.1 million from
June 30, 1995.  Cash provided by operating activities for the nine months ended
March 31, 1996 was $35.6 million offset by cash used in investing activities of
$32.9 million and cash used in financing activities of $11.8 million.

         Trade accounts receivable decreased by $5.0 million due to improved
collections and higher revenues in the fourth quarter of fiscal 1995 as
compared to the current quarter.  Management continues its emphasis on
improving collections, which has impacted the trade accounts receivable balance
and reduced the significant fluctuations experienced in days sales outstanding.
Management intends to focus efforts on maintaining days sales outstanding
within a 85 to 95 day range.

         Software development costs, net increased by $3.1 million from June
30, 1995 due to the $1.5 million of software development costs recorded in
connection with the WAII acquisition and the $4.1 million of costs capitalized
during the Current Period.  These additions were offset by $2.7 million of
amortization of software development costs in the Current Period.

         Intangibles increased approximately $10.9 million from the balance at
June 30, 1995.  This increase is primarily due to the $4.6 million of goodwill
recorded from the WAII acquisition and to a guarantee of $6.9 million of
earn-out payments for the MGA acquisition.  The  initial MGA guaranteed payment
of $1.8 million was paid in September 1995.

         Accounts payable and accrued liabilities increased approximately $6.5
million from June 30, 1995 due partially to the recording of the $2.3 million
current liability related to the second MGA guaranteed payment that is due on
September 30, 1996.  The remainder of the difference was due to timing of the
receipt and payment of vendor invoices.  Based on the nature of these accounts,
period to period fluctuations can be expected to continue.





                                       14
<PAGE>   17
         Current maturities of long-term debt decreased $1.0 million and
long-term debt decreased $11.0 million from the balances at June 30, 1995 due
to the payoff of the term loan and credit revolver in October 1995.

         Other long-term liabilities increased approximately $2.8 million from
June 30, 1995.  This increase represents the final MGA guaranteed payment of
$2.8 million which is due September 30, 1997.

         During the Current Period, the Company repurchased 320,000 shares of
its Common Stock for $4.1 million and 82,000 of the shares were reissued upon
the exercise of employee stock options.  The Company plans to acquire additional
shares in the future for reissuance related to employee stock option activity.

         The Company's primary internal source of liquidity is cash flow
generated from operations.  External sources of liquidity include debt and
equity financing.  On December 15, 1995, the Company terminated its $25.0
million credit facility and entered into a $100.0 million revolving credit
agreement with a syndicate of seven banks.  The agreement contains certain
restrictive and financial covenants, including those related to indebtedness,
net worth and fixed charges, and provides for guarantees by certain
subsidiaries of Landmark.  At March 31, 1996 there were $2.7 million in letters
of credit, no revolving loans outstanding under this facility, and the Company
was in compliance with the aforementioned loan covenants.  The Company believes
funds generated from operations will be sufficient to meet liquidity
requirements in the foreseeable future.

        In connection with the MGA transaction, the Company acquired an option
to purchase the equity interests of a corporation owned by certain of the
former shareholders of MGA ("Argus") in exchange for a $3.0 million line of
credit guarantee. On April 29, 1996, this option agreement was terminated and
the Company was assigned ownership of certain software previously owned by
Argus. The Company's guarantee of the $3.0 million line of credit remains in
effect. The Company is currently making interest payments on behalf of Argus
and could be called upon to perform on the guarantee.

         The Company has not paid cash dividends since its inception and does
not intend to pay cash dividends in the future.  The Company presently intends
to retain earnings for use in its business, with any future decision to pay
cash dividends dependent on the Company's growth, profitability, financial
condition and other factors the Board of Directors may deem relevant.
Furthermore, certain provisions of the Company's revolving credit agreement
restrict the Company's ability to pay cash dividends.

         Management continues to evaluate opportunities to acquire product
technologies or businesses.  These acquisition opportunities may involve the
use of cash or, depending upon the size and terms of the acquisition, may
require debt or equity financing.  Expenses associated with these potential
acquisitions and post acquisition integration issues may have an adverse impact
on the Company's results of operations in the period the transactions are
consummated or the periods shortly thereafter.





                                       15
<PAGE>   18
PART II - OTHER INFORMATION


ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

    (a)  Exhibits
<TABLE>
<CAPTION>
                                                                     Incorporation by reference from
                   Exhibit number and description           Form            Date        File No.         Exhibit
                   ------------------------------           ----            ----        --------         -------
        <S>                                                 <C>             <C>         <C>              <C> 
        (2)        Plan of Acquisition, Reorganization, Arrangement, Liquidation or Succession      
                   ---------------------------------------------------------------------------      
                                                                                                    
            2.1        Purchase Agreement by and            NA               NA            NA               NA
                       between the Company and                                                          
                       Western Atlas International,                                                     
                       Inc. ("WAII") for certain                                                        
                       assets of WAII.                                                                  
                                                                                                    
                                                                                                    
        (27)       Financial Data Schedule                                                             
                   -----------------------                                                             
                                                                                                    
           27          Financial data schedule as of        NA               NA            NA               NA
                       and for the nine months ended                                                    
                       March 31, 1996.                                                                  
</TABLE>

    (b)  Reports on Form 8-K.

         Form 8-K dated April 2, 1996 which identified important factors that
         could cause the Company's actual results to differ materially from
         those projected in forward looking statements of the Company made by
         or on behalf of the Company.





                                       16
<PAGE>   19
                                   SIGNATURES

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


                                       LANDMARK GRAPHICS CORPORATION



Date:   May 10, 1996                   By: /s/ Robert P. Peebler
                                           -------------------------------------
                                           Robert P. Peebler
                                           President and Chief Executive Officer



                                       By: /s/ William H. Seippel
                                           -------------------------------------
                                           William H. Seippel
                                           Vice President, Finance and
                                           Chief Financial Officer
                                           (Principal Financial and Accounting
                                           Officer)





                                       17
<PAGE>   20

                                                  INDEX TO EXHIBITS


<TABLE>
<CAPTION>
      Exhibit
      Number                                   Description
      -------                                  -----------

        <S>        <C>                                                                     
        (2)        Plan of Acquisition, Reorganization, Arrangement, Liquidation or Succession      
                       
                                                                                                    
            2.1        Purchase Agreement by and between the Company and Western Atlas International, Inc. ("WAII") for certain  
                       assets of WAII.                                                                  
                                                                                                    
                                                                                                    
        (27)       Financial Data Schedule                                                             
                                                                              
                                                                                                    
           27        Financial data schedule as of and for the nine months ended March 31, 1996.       
</TABLE>


<PAGE>   1





                               PURCHASE AGREEMENT


                                 by and between


                         LANDMARK GRAPHICS CORPORATION,
                            a Delaware corporation,



                                      and


                       WESTERN ATLAS INTERNATIONAL, INC.,
                             a Delaware corporation





                           Dated as of March 29, 1996






<PAGE>   2
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                           Page
                                                                                                           ----
<S>                                                                                                         <C>               
ARTICLE I DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     1
         1.1       Terms Defined  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     1
         1.2       Number and Gender  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     5

ARTICLE II PURCHASE AND SALE OF ASSETS; CLOSING . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     6
         2.1       Purchase and Sale of the Assets  . . . . . . . . . . . . . . . . . . . . . . . . . . .     6
         2.2       License Grants.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     6
         2.3       Consideration  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .    9
         2.4       Closing  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .   10
         2.5       Items to be delivered at Closing   . . . . . . . . . . . . . . . . . . . . . . .  . . .   10
         2.6       Required Consents  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .   12
         2.7       Manufacturer/Vendor Warranties   . . . . . . . . . . . . . . . . . . . . . . . .. . . .   12
         2.8       Costs and Expenses  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   12
         2.9       Allocation of Purchase Price    . . . . . . . . . . . . . . . . . . . . . . . . . . . .   12
         2.10      Transfer Taxes    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   13
         2.11      WAII Engagement of Landmark   . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   13
                                                                                                               
ARTICLE III REPRESENTATIONS AND WARRANTIES OF WAII   . . . . . . . . . . . . . . . . . . . . . . . . . . .   14
         3.1       Organization and Good Standing    . . . . . . . . . . . . . . . . . . . . . . . . . . .   14
         3.2       Authorization; Enforcement    . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   14
         3.3       No Conflicts; Compliance with Obligations; No Consents    . . . . . . . . . . . . . . .   15
         3.4       Title to Assets   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   15
         3.5       Intellectual Property and Software    . . . . . . . . . . . . . . . . . . . . . . . . .   15
         3.6       Contracts   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   17
         3.7       Compliance with Law   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   19
         3.8       Customer List   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   19
         3.9       Adverse Agreements and Changes .  . . . . . . . . . . . . . . . . . . . . . . . . . . .   19
         3.10      Litigation and Claims   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   19
         3.11      Absence of Certain Developments   . . . . . . . . . . . . . . . . . . . . . . . . . . .   20
         3.12      Employee Benefit Plans    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   20
         3.13      Labor Matters   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   20
         3.14      Disclaimer    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   21
                                                                                                           
ARTICLE IV REPRESENTATIONS AND WARRANTIES OF LANDMARK  . . . . . . . . . . . . . . . . . . . . . . . . . .   21
         4.1       Organization and Good Standing    . . . . . . . . . . . . . . . . . . . . . . . . . . .   21
         4.2       Authorization; Enforcement    . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   21
         4.3       No Conflicts; Compliance with Obligations; No Consents    . . . . . . . . . . . . . . .   21
                                                                                                          
ARTICLE V COVENANTS AND AGREEMENTS   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   22
         5.1       Use of Facilities   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   22
         5.2       Employee and Labor Matters    . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   22
         5.3       Confidentiality   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   27
         5.4       Taking of Necessary Action    . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   29
         5.5       Press Releases    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   29


</TABLE>


                                    - 1 -


<PAGE>   3

<TABLE>
<CAPTION>
                                                                                                           Page
                                                                                                           ----
<S>                                                                                                         <C>               

         5.6       Change of Control of Landmark   . . . . . . . . . . . . . . . . . . . . . . . . . . . .   30
         5.7       Dispute Cooperation   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   32
         5.8       Agreement to Adopt Successor Tax Procedures   . . . . . . . . . . . . . . . . . . . . .   32
         5.9       Post-Closing Exchanges    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   33
         5.10      Broker's or Finder's Fees   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   33
         5.11      Use and Removal of Trademarks, Logos, etc.    . . . . . . . . . . . . . . . . . . . . .   33
                                                                                                          
ARTICLE VI INDEMNIFICATION   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   33
         6.1       Indemnification of Landmark   . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   33
         6.2       Indemnification of WAII   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   34
         6.3       Procedural Limitations on Indemnification   . . . . . . . . . . . . . . . . . . . . . .   34
         6.4       Claims for Reimbursement    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   34
         6.5       Defense and Settlement of Third-Party Claims    . . . . . . . . . . . . . . . . . . . .   35
         6.6       Monetary Limitations on Indemnification   . . . . . . . . . . . . . . . . . . . . . . .   36
         6.7       Arbitration   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   37
         6.8       Exclusive Remedies    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   39
                                                                                                          
ARTICLE VII MISCELLANEOUS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   39
         7.1       Effect of Due Diligence   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   39
         7.2       Notices   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   40
         7.3       Entire Agreement    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   40
         7.4       Amendments    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   41
         7.5       Survival    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   41
         7.6       Assignments   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   41
         7.7       Counterparts    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   41
         7.8       Section Headings    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   41
         7.9       GOVERNING LAW   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   41
         7.10      Further Assurances    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   41
         7.11      No Third Party Beneficiaries    . . . . . . . . . . . . . . . . . . . . . . . . . . . .   41
         7.12      Severability    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   42
         7.13      ACKNOWLEDGEMENT OF LANDMARK   . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   42
                                                                                                          

</TABLE>



                                      -2-
<PAGE>   4



SCHEDULES:


<TABLE>
     <S>                       <C>
     Schedule 2.2(a)           License Grants

     Schedule 2.3(b)           Certain Assumed Obligations

     Schedule 2.9              Allocation of Purchase Price

     Schedule 3.3              Consents, Approvals, Authorizations or Orders (WAII)

     Schedule 3.4              List of Equipment

     Schedule 3.5(a)           Intellectual Property and Software Owned by WAII

     Schedule 3.5(b)           Intellectual Property and Software Used by WAII

     Schedule 3.5(e)           Protection of Trade Secrets

     Schedule 3.6              Assumed Contracts

     Section 3.8               Customer List

     Schedule 4.3              Consents, Approvals, Authorizations or Orders (Landmark)

     Schedule 5.2(b)(i)        List of Employees

     Schedule 5.2(b)(ii)       List of Retained Employees

     Schedule 5.2(c)           List of Business Employees


</TABLE>




                                      -3-
<PAGE>   5



EXHIBITS:

     Exhibit A       Assignment of Lease

     Exhibit B       Assignments of Intellectual Property

     Exhibit C       Bill of Sale and Assignment

     Exhibit D       [Reserved]

     Exhibit E       Landmark Legal Opinion

     Exhibit F       Non-Competition Agreement

     Exhibit G       [Reserved]

     Exhibit H       WAII Lease

     Exhibit I       WAII Legal Opinion

     Exhibit J       [Reserved]

     Exhibit K       Western Atlas Service Agreement





                                      -4-


<PAGE>   6



                               PURCHASE AGREEMENT


        This PURCHASE AGREEMENT (the "Agreement") is made and entered into as
of the 29th day of March, 1996 (the "Agreement Date"), by and between Landmark
Graphics Corporation, a Delaware corporation ("Landmark"), and Western Atlas
International, Inc., a Delaware corporation ("WAII").

                                R E C I T A L S:

        A. WAII, through the Division (as defined in Section 1.1), is carrying
on and conducting, among other activities, the business of marketing,
licensing, maintaining and supporting certain computer software, including,
without limitation, the Software (as defined in Section 1.1), that is used in
oil and gas exploration and production (such business is sometimes referred to
in this Agreement as the "Business").

        B. WAII desires to sell the Assets (as defined in Section 1.1) to
Landmark and Landmark desires to acquire the Assets from WAII, subject to the
terms and conditions set forth in this Agreement.

        C. WAII and Landmark desire to provide for the continued development,
marketing, maintenance and support of the Software (as defined in Section 1.1),
subject to the terms and conditions set forth in this Agreement and in the
Related Agreements (as defined in Section 1.1).

                                   ARTICLE I

                               A G R E E M E N T:

        NOW, THEREFORE, in consideration of the premises, the mutual covenants
and agreements contained in this Agreement and the Related Agreements and other
good and valuable consideration, the receipt and sufficiency of which are
acknowledged, Landmark and WAII agree as follows:

                                  DEFINITIONS

        1.1  Terms Defined.  Capitalized terms used in this Agreement and not
otherwise defined shall have the following meanings:

        "Account Balances" shall have the meaning set forth in Section 5.2(i).

        "Affiliate" shall mean, with respect to any Person, any other Person
which, directly or indirectly, controls, is controlled by or is under, control
with the specified Person.

        "Agreement" shall mean this Purchase Agreement, including all
amendments and all Exhibits and Schedules.

        "Agreement Date" shall have the meaning set forth in the first
paragraph of this Agreement.

        "Assets" shall mean (i) WAII's rights under the Assumed Contracts, (ii)
the Equipment, (iii) the Intellectual Property and (iv) the Software; provided,
however, that the Assets shall not include any Excluded Assets.




<PAGE>   7
        "Assignment of Lease" shall mean an Assignment of Lease substantially
in the form of Exhibit A.

        "Assignments of Intellectual Property" shall mean the Assignments of
Intellectual Property substantially in the form of Exhibit B.

        "Assumed Contracts" shall mean the bids, tenders and proposals and the
contracts, leases, licenses and other agreements listed in Schedule 3.6.

        "Assumed Obligations" shall have the meaning set forth in Section
2.3(b).

        "Assuming Party" shall have the meaning set forth in Section 5.6(b).

        "Basket" shall have the meaning set forth in Section 6.6.

        "Bill of Sale and Assignment" shall mean a Bill of Sale and Assignment
in substantially the form of Exhibit C.

        "Business" shall have the meaning set forth in Recital A.

        "Business Combination" shall have the meaning set forth in Section
5.6(b)(ii).

        "Business Employees" shall have the meaning set forth in Section
5.2(c).

        "Buying Interests" shall have the meaning set forth in Section 6.1.

        "Change in Control" shall have the meaning set forth in Section 5.6(b)

        "Closing" shall mean the consummation of the purchase and sale of the
Assets pursuant to this Agreement.

        "Closing Date" shall mean the date on which the Closing occurs and with
respect to all transactions which this Agreement and the Related Agreements
state will occur on the Closing Date will be deemed to mean 11:59.59 p.m.
Houston, Texas time on such date.

        "Code" shall mean the Internal Revenue Code of 1986, as amended.

        "Confidential Information" shall have the meaning set forth in Section
5.3(c).

        "Customer List" shall have the meaning set forth in Section 3.8.

        "Direct Litigation Option" shall have the meaning set forth in Section
6.5.

        "Disputes" shall have the meaning set forth in Section 6.7.

        "Division" shall mean the Western Atlas Software Division of WAII.

        "Employee Benefit Plans" shall mean any employee benefit plan, together
with any other plan, program or arrangement to provide employee bonuses,
incentive, deferred compensation or workers compensation, including without
limitation, any stock purchase or stock option plan, stock appreciation right,
retirement, savings, medical, vacation, or similar benefit plans, trusts,
agreements or arrangements (whether or not maintained pursuant to a collective
bargaining agreement, employment contract or otherwise) applicable to
Transferring Employees and maintained, sponsored or contributed to by WAII or
any Affiliate (including, without limitation, any ERISA Affiliate) of WAII.




                                    - 2 -
<PAGE>   8

        "Employee Intellectual Property/Software" shall mean all copyrights,
patents, patent applications, trademarks or service marks and/or software
programs created in connection with or resulting from the performance of
services by the Business Employees for Landmark pursuant to Section 5.2(c).

        "Entity" shall have the meaning set forth in Section 5.6(b)(i).

        "Equipment" shall mean the items of computer hardware, equipment,
office furniture and similar personal property included on Schedule 3.4.

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

        "ERISA Affiliate" shall mean any member of a controlled group of
corporations (as defined in Section 414(b) of the Code), a group of trades or
businesses (whether or not incorporated) which are under common control (as
defined in Section 414(c) of the Code, an affiliate service group (as defined
in Section 414(m) of the Code, or a group of entities which is otherwise
required to be aggregated with any entity pursuant to Section 414(o) of the
Code, and the regulations issued under such sections, of which WAII is a
member.

        "Excluded Assets" shall mean all assets of WAII other than the Assets.

        "Exhibit" shall mean any referenced exhibit which is attached to this
Agreement.

        "Favorable Determination Letter" shall have the meaning set forth in
Section 5.2(i).

        "Good Title" shall mean good and indefeasible title which is free and
clear of all Liens.

        "Identified Landmark Patents" shall have the meaning set forth in
Section 2.2(d).

        "Identified WAII Patents" shall have the meaning set forth in Section
2.2(c).

        "Indemnified Party" shall have the meaning set forth in Section 6.4.

        "Indemnifying Party" shall have the meaning set forth in Section 6.4.

        "Investigation Period" shall have the meaning set forth in Section 6.4.

        "Intellectual Property" shall mean all copyrights, patents, patent
applications, trademarks or service marks of WAII used in connection with the
Software but shall not include the name Western Atlas International, Inc.,
Western Atlas Software Division or any name which is deceptively similar to
such names or any logos of WAII or WAI.

        "IRS" shall mean the United States Internal Revenue Service.

        "Knowledge" shall mean with respect to WAII the current actual
knowledge of any of the officers or directors of WAII or any of the officers or
product line directors of the Division.



                                    - 3 -
<PAGE>   9

        "Landmark" shall have the meaning set forth in the first paragraph of
this Agreement.

        "Landmark Legal Opinion" will mean the legal opinion of Winstead
Sechrest & Minick P.C. in substantially the form of Exhibit E.

        "Landmark Plan" shall have the meaning set forth in Section 5.2(i).

        "Lien" shall mean any lien, pledge, mortgage, deed of trust, security
interest or encumbrance of any nature, other than liens for property taxes for
the current calendar year which are not yet due and payable and minor
imperfections of title which do not interfere with the present use or value of
the property.

        "Loss" shall have the meaning set forth in Section 6.1.

        "Non-Assigned Obligation" shall have the meaning set forth in Section
2.3(c).

        "Non-Competition Agreement" shall mean the Non-Competition Agreement
substantially in the form of Exhibit F.

        "Offerees" shall have the meaning set forth in Section 5.2(h)(i).

        "Outstanding Landmark Common Stock" shall have the meaning set forth in
Section 5.6(b)(i).

        "Outstanding Landmark Voting Securities" shall have the meaning set
forth in Section 5.6(b)(i).

        "Party" shall mean either Landmark or WAII and "Parties" shall mean
Landmark and WAII collectively.

        "Person" shall mean an individual, partnership, joint venture,
corporation, trust or other unincorporated entity or organization. "Purchase
Price" shall have the meaning set forth in Section 2.3(a).

        "Records" shall mean, to the extent available, originals of (i) the
documents evidencing the Assumed Obligations, including, without limitation,
the Assumed Contracts, and (ii) the files, customer lists, vendor lists and
other records and data which relate primarily to the Assets.  Without limiting
the generality of the foregoing, the term "Records" will be deemed to include,
to the extent available, all registrations, applications and other documents
evidencing the ownership of Intellectual Property.

        "Related Agreements" shall mean each of the agreements and instruments
to be executed by Landmark or WAII pursuant to this Agreement, including
without limitation the Non-Competition Agreement and the Western Atlas Service
Agreement.

        "Required Consent" shall have the meaning set forth in Section 2.6.

        "Retained Employees" shall have the meaning set forth in Section
5.2(b).

        "Seller Favorable Determination Letter" shall have the meaning set
forth in Section 5.2(i).



                                    - 4 -
<PAGE>   10

        "Schedule" shall mean any referenced schedule which is attached to this
Agreement.

        "Section" shall mean, unless otherwise noted, a section or subsection
of this Agreement.
        
        "Selling Interests" shall have the meaning set forth in Section 6.2.

        "Settlement Review Period" shall have the meaning set forth in Section
6.5.

        "Software" shall mean all computer software applications programs
identified in Schedule 3.5(a), together with the object codes and source codes,
including all updates, upgrades, modifications and enhancements existing as of
the Closing Date and any user and technical manuals and documentation with
respect to such Software but shall not mean the Excluded Assets.

        "Third Party Claim" shall have the meaning set forth in Section 6.4.

        "Transferring Employee" shall have the meaning set forth in Section
5.2(b).

        "Vacation Accrual" shall have the meaning set forth in Section
5.2(h)(i).

        "Vacation Period" shall have the meaning set forth in Section
5.2(h)(i).

        "WAI" shall have the meaning set forth in Section 7.6.

        "WAII" shall have the meaning set forth in the first paragraph of this
Agreement.

        "WAII Lease" shall mean a lease in substantially the form of Exhibit H.

        "WAII Legal Opinion" will mean the legal opinion of James E. Brasher,
Vice President and General Counsel to WAII, in substantially the form of
Exhibit I.

        "WAII Plan" shall have the meaning set forth in Section 5.2(i).

        "WAII Software" shall have the meaning set forth in Section 5.6(c).

        "WARN" shall have the meaning set forth in Section 5.2(a).

        "Western Atlas Service Agreement" shall mean the Western Atlas Service,
Development and Marketing Agreement substantially in the form of Exhibit K.

        Number and Gender.  Whenever the context requires, references in this
Agreement to the singular number shall include the plural, and the plural
number shall include the singular, and words denoting gender shall include the
masculine, feminine and neuter.




                                    - 5 -
<PAGE>   11
                                 ARTICLE II

                      PURCHASE AND SALE OF ASSETS; CLOSING

        2.1  Purchase and Sale of the Assets.  Subject to the terms and
conditions set forth in this Agreement and in the Related Agreements (i) WAII
shall convey, sell, transfer and assign to Landmark, and Landmark shall purchase
and acquire from WAII, at the Closing, all of WAII's right, title and interest
in and to all of the Assets and all pending applications and registrations with
respect to Intellectual Property, (ii) WAII shall grant to Landmark and Landmark
shall accept the licenses contemplated by Section 2.2(a) and (iii) Landmark
shall grant to WAII and WAII shall accept the licenses contemplated by Section
2.2(b).

        2.2  License Grants.

        (a) License Grant to Landmark.  At Closing, WAII will be deemed to have
granted to Landmark

                (i) a fully paid, perpetual, irrevocable, nonexclusive,
        worldwide license to prepare derivative works based on the modules,
        executables, libraries, applications and utility programs listed in
        Schedule 2.2(a) for use only as part of software applications programs
        designated in Schedule 2.2(a) and/or Landmark products which replace
        such designated applications programs and to use, copy and distribute
        such modules, executables, libraries, applications and utility programs
        and derivative works, only as part of such software applications
        programs and Landmark products; and

                (ii) a fully paid, perpetual, irrevocable, non-exclusive,
        worldwide, transferable license to prepare derivative works based on the
        trade secrets embodied in or related to the Software, Intellectual
        Property and Employee Intellectual Property/Software and to use, copy,
        license, sub-license and distribute the trade secrets embodied in or
        related to the Software, Intellectual Property and Employee Intellectual
        Property/Software and such derivative works.

The license granted under Section 2.2(a)(i) for the items listed in Part C of
Schedule 2.2(a) titled "WINDlib Libraries from HALkit" may not be transferred
or extended by Landmark to any third party under any circumstances without
written authorization from WAII. The license granted under Section 2.2(a)(i)
for the other modules, executables, libraries, applications or utility programs
listed in Schedule 2.2(a) shall not be transferable or extendable by Landmark
except that the license for a specific module, executable, library, application
or utility program may be extended to a purchaser of substantially all of
Landmark's right, title and interest in a software applications program with
which the use and distribution of a specific module, executable, library,
application or utility is authorized under Section 2.2(a)(i).  However,
Landmark may not extend to any such purchaser any greater rights to such
module, executable, library, application or utility than are granted to
Landmark under Section 2.2(a)(i).  Subject to the license granted to Landmark
under Section 2.2(a)(i), WAII retains all right, title and interest, including
the copyright, to the modules, executables, libraries or utility programs
listed in Schedule 2.2(a).  The license granted under Section 2.2(a)(ii) shall
be freely transferable by Landmark without restriction.



                                    - 6 -
<PAGE>   12

        (b)  License Grant to WAII.  At the Closing, Landmark will be deemed to
have granted to WAII a fully paid, perpetual, irrevocable, nonexclusive,
worldwide license with respect to the Intellectual Property and Software to the
extent provided in the Related Agreements.

        (c)  Grant of Patent License to Landmark.  WAII grants to Landmark a
fully-paid, perpetual, irrevocable, non-exclusive license under the following
United States patent and patent application and all patents issuing pursuant to
such patent application and all divisions, reissues, continuations,
continuations-in-part, and substitutes for any such patent and patent
application as well as, all corresponding foreign patents and patent
applications (collectively "Identified WAII Patents"):

        Patent:

                "A Monte Carlo Method for Estimating Lithology from Seismic
        Data"; Patent No. 4,926,394; issued May 15, 1990.

        Patent Application:

                "A Method for Generating a Three Dimensional Locally
        Unstructured Hybrid Grid for Sloping Faults"; Serial No. 08/417,643;
        filed April 5, 1995.

WAII, at its own expense, shall prosecute and maintain Identified WAII Patents. 
If WAII elects to abandon or not to maintain one of the Identified WAII
Patents, it shall give Landmark three month's prior written notice of the
effective date of the abandonment of said patent.  If Landmark desires to
prosecute or maintain that patent or patent application, Landmark shall
promptly notify WAII of its desire and WAII shall assign such patent or patent
application to Landmark (at no additional cost to Landmark).  Landmark shall
give WAII prompt written notice of any infringement or potential infringement
of Identified WAII Patents of which Landmark becomes aware. Upon such notice,
WAII may elect to retain counsel of its own selection and at its own expense,
to investigate and defend against any such infringement. If WAII decides to
commence such proceedings, WAII shall be responsible for any legal costs
incurred and will be entitled to retain any damages recovered.  In the event
that WAII does commence such proceedings, Landmark agrees to render all
reasonable assistance to WAII without charge to WAII.  If WAII decides not to
commence proceedings against the alleged infringer within a reasonable period
of time after receiving written notice of infringement, then Landmark shall be
entitled to bring suit in its own name against the infringing party.  If
Landmark elects to commence a proceeding against the infringing party, WAII
agrees to provide Landmark with all reasonable assistance (at no additional
cost to Landmark) and Landmark will be responsible for any legal costs incurred
in connection with the proceeding and will be entitled to retain any damages
recovered.  In the event that WAII makes licenses available to other parties
under United States patent application serial number 08/494,603 entitled
"Bayesian Sequential Gaussian Simulation of Lithology with Non-Linear Data,"
any patent that issues therefrom, and all divisions, reissues, continuations,
continuations-in-part, and substitutes for such patent or patent application,
as well as, all corresponding foreign patents and patent applications, then
WAII shall grant to Landmark a royalty-free, perpetual, irrevocable,
non-exclusive license under such patent, patent application, and all divisions,
reissues, continuations, continuations-in-part and substitutes for such patent
or patent application, as well as, all corresponding foreign patents and patent
applications.



                                     - 7 -
<PAGE>   13


        (d)  Grant of Patent License to WAII.  Landmark grants to WAII and its
Affiliates a fully-paid, perpetual, irrevocable, non-exclusive license under the
following United States patent and patent application and all patents issuing
pursuant to such patent application and all divisions, reissues, continuations,
continuations-in-part, and substitutes for any such patent and patent
application as well as, all corresponding foreign patents and patent
applications (collectively "Identified Landmark Patents"):

        Patent:

                "Bayesian Sequential Indicator Simulator of Lithology from
        Seismic Data"; Patent No. 5,416,750; issued May 16, 1995.

        Patent Application:

                "Method for Interacting with Computer Graphics"; Serial No.
        08/393,252; filed February 23, 1995.

Landmark also grants to WAII the right to extend a fully-paid, perpetual
irrevocable, non-exclusive license to The Halliburton Company, its affiliates
and customers, under patent application Serial No. 08/393,252 and all patents
issuing pursuant to such patent application and all divisions, reissues,
continuations, continuations-in-part, and substitutes for any such patent and
patent application.  Landmark, at its own expense, shall prosecute and maintain
Identified Landmark Patents.  If Landmark elects to abandon or not to maintain
one of the Identified Landmark Patents, it shall give WAII three month's prior
written notice of the effective date of the abandonment of said patent.  If
WAII desires to prosecute or maintain that patent or patent application, WAII
shall promptly notify Landmark of its desire and Landmark shall assign such
patent or patent application to WAII (at no additional cost to WAII).  WAII
shall give Landmark prompt written notice of any infringement or potential
infringement of Identified Landmark Patents of which WAII becomes aware.  Upon
such notice, Landmark may elect to retain counsel of its own selection and at
its own expense, to investigate and defend against any such infringement.  If
Landmark decides to commence such proceedings, Landmark shall be responsible
for any legal costs incurred and will be entitled to retain any damages
recovered.  In the event that Landmark does commence such proceedings, WAII
agrees to render all reasonable assistance to Landmark without charge to
Landmark.  If Landmark decides not to commence proceedings against the alleged
infringer within a reasonable period of time after receiving written notice of
infringement, then WAII shall be entitled to bring suit in its own name against
the infringing party.  If WAII elects to commence a proceeding against the
infringing party, Landmark agrees to provide WAII with all reasonable
assistance (at no additional cost to WAII) and WAII will be responsible for any
legal costs incurred in connection with the proceeding and will be entitled to
retain any damages recovered.

        (e)  Grant of Patent Immunities.  WAII grants Landmark and its customers
a royalty-free immunity under any WAII patent or future patent, to the extent
that such patents or one or more claims of such patents are infringed, either
directly or under the doctrine of equivalents, by the "Division Software" (as
such term is defined in the Western Atlas Service Agreement).




                                    - 8 -


<PAGE>   14


        2.3  Consideration.

        (a)  Purchase Price. The purchase price which Landmark agrees to pay,
and which WAII agrees to accept, for the Assets, all pending applications and
registrations with respect to Intellectual Property and the licenses
contemplated by Section 2.2(a) (the "Purchase Price") is $15 million, payable by
bank cashier's check.

        (b)  Assumption.  Landmark hereby assumes, covenants to pay, perform,
observe the terms of, satisfy and/or discharge if, as, when, and to the extent
due in accordance with the terms thereof, all obligations accruing under or
pursuant to the Assumed Contracts and the other obligations of WAII identified
on Schedule 2.3(b) (hereinafter collectively referred to as the "Assumed
Obligations"), to the extent such obligations relate to any period after the
Closing Date.

        (c)  Notwithstanding the provisions of Section 2.3(b), Landmark shall
not assume, and will not be deemed to have assumed, any obligations under or
related to an Assumed Obligation (hereinafter individually referred to as a
"Non-Assigned Obligation" and collectively referred to as the "Non-Assigned
Obligations") unless and until WAII delivers to Landmark any Required Consent
relating to such Non-Assigned Obligation upon which occurrence, automatically
and without any further action on the part of Landmark or WAII, Landmark shall
be deemed to have assumed such Non-Assigned Obligation and from and after the
delivery of such Required Consent to Landmark such Non-Assigned Obligation will
be deemed to be an Assumed Obligation.  If any Non-Assigned Obligation
terminates prior to the delivery of a Required Consent, such Non-Assigned
Obligation will cease to constitute a Non-Assigned Obligation for purposes of
this Agreement and Landmark will not be deemed to have assumed any obligations
under, related to or arising out of such Non-Assigned Obligation.

        (d)  Exclusions. Notwithstanding the foregoing, Landmark does not assume
and Landmark will not be liable or responsible for any debt, liability, or
obligation of WAII not expressly assumed by Landmark in Section 2.3(b) of this
Agreement.  Without limiting the generality of the foregoing, Landmark does not
assume and will not be liable or responsible for any of the following debts,
liabilities or obligations of WAII:

                (i)  any federal or state income or franchise tax liability of
        WAII or any Affiliate of WAII;

                (ii)  any indebtedness for money borrowed by WAII or any
        Affiliate of WAII, including, without limitation, any amounts that may
        be owed to any Affiliate of WAII;



                                    - 9 -
<PAGE>   15

                (iii)  any debt, liability, obligation or damages (including,
        without limitation, direct, incidental, consequential, punitive or
        exemplary damages) arising as a result of any violation of law or a
        breach of any contract, agreement, lease, bid, proposal, tender or
        license (including, without limitation, the Assumed Obligations) by WAII
        or by any Affiliate of WAII; or

                (iv)  any monetary damages (including, without limitation,
        direct, incidental, consequential, punitive or exemplary damages) or
        other liabilities, obligations, losses or expenses for any personal
        injury, product liability or other tort to the extent arising as a
        result of acts or omissions by WAII or any Affiliate of WAII.

        (c)  Substitution and References.  From and after the Closing Date and
subject to the provisions of Section 2.3(c), (i) Landmark will be deemed to be
substituted for WAII and its predecessors throughout each document evidencing an
Assumed Obligation, (ii) all references to WAII and its predecessors in such
documents will be deemed to be references to Landmark and (iii) Landmark will be
entitled to exercise all of the rights and shall be obligated to perform all of
the obligations of WAII and its predecessors pursuant to the Assumed
Obligations.

        2.4  Closing.  The Closing shall take place at the offices of Winstead
Sechrest & Minick P.C., Suite 1700, 910 Travis Street, Houston, Texas
75270-5895, or such other place as shall be agreed upon by Landmark and WAII, at
10:00 a.m. on March 29, 1996, or on such other date mutually agreed to by the
Parties.

        2.5  Items to be delivered at Closing.

                (a)  WAII Deliverables.  At the Closing, WAII will:

                        (i)  execute and deliver to Landmark Assignments of
                Intellectual Property;

                        (ii)  execute and deliver to Landmark a Bill of Sale and
                Assignment;

                        (iii)  execute and deliver to Landmark such other
                instruments of transfer as are reasonably requested by Landmark
                to convey to Landmark Good Title in, possessory rights to or a
                valid right to use the Assets;

                        (iv)  execute and deliver to Landmark a Non-Competition
                Agreement;

                        (v)  deliver to Landmark possession of the Customer
                List;



                                   - 10 -
<PAGE>   16

                        (vi)  deliver or make available to Landmark possession
                of the Records, the Software and the Equipment;

                        (vii)  execute and deliver to Landmark an Assignment of
                Lease (Bellevue, Washington Lease);

                        (viii)  cause to be delivered to Landmark the WAII Legal
                Opinion;

                        (ix)  execute and deliver to Landmark the Western Atlas
                Service Agreement;

                        (x)  deliver to Landmark, by bank cashier's check, cash
                in an amount equal to the maintenance and support fees with
                respect to the Software which have been prepaid to WAII or its
                Affiliates prior to Closing and which relate to any period after
                the Closing during which Landmark will be providing maintenance
                and/or support with respect to the Software pursuant to the
                Assumed Contracts, this Agreement or any Related Agreement;

                        (xi)  deliver to Landmark a certificate of existence and
                good standing (or comparable certificate) of WAII issued by the
                Secretary of State of the State of Delaware, dated not earlier
                than ten (10) days prior to the Closing Date;

                        (xii)  deliver to Landmark a copy of resolutions of the
                Board of Directors of WAII, certified by the Secretary or
                Assistant Secretary of WAII, authorizing the transactions
                contemplated by this Agreement and the Related Agreements to
                which it is a party; and

                        (xiii)  execute and deliver to Landmark the WAII Lease.

                Subsequent to the Closing, WAII will, upon the request of
                Landmark, (i) assign Good Title to all of WAII's right, title
                and interest in, to and under the Employee Intellectual
                Property/Software or (ii) cooperate with Landmark , at
                Landmark's expense, in any litigation or proceeding relating
                to the Employee Intellectual Property/Software, including,
                without limitation, preparing affidavits, instruments or other
                documents necessary in connection with any (a) copyright,
                trademark, service mark, or patent application filed by
                Landmark in connection with or (b) attempt to enforce or
                otherwise protect such Employee Intellectual
                Property/Software.

                (b)  Landmark Deliverables.  At the Closing, Landmark shall:

                        (i) deliver the Purchase Price to WAII in accordance
                with Section 2.3;



                                   - 11 -
<PAGE>   17

                        (ii)  execute and deliver the Assignment of Lease;

                        (iii)  cause to be delivered to WAII the Landmark Legal
                Opinion;

                        (iv)  execute and deliver to WAII the Western Atlas
                Service Agreement;

                        (v)  deliver to WAII a certificate of existence and good
                standing of Landmark issued by the Secretary of State of the
                State of Delaware, dated not earlier than ten (10) days prior to
                the Closing Date;

                        (vi)  deliver to WAII a copy of resolutions of the Board
                of Directors of Landmark, certified by the Secretary or
                Assistant Secretary of Landmark, authorizing the transactions
                contemplated by this Agreement and the Related Agreements to
                which it is a party;  and

                        (vii)  execute and deliver to WAII the WAII Lease.

        2.6  Required Consents.  To the extent that the assignment by WAII of
any Assumed Obligation to be assigned to Landmark pursuant to this Agreement
shall require the consent or approval of any other party (a "Required Consent"),
and such Required Consent shall not have been obtained on or prior to the
Closing Date, this Agreement shall not constitute a contract to assign the same
if an attempted assignment would constitute a breach of such Assumed Obligation
or would in anyway adversely affect the rights of WAII (or Landmark as assignee)
under that Assumed Obligation.  If any Required Consent is not obtained on or
prior to the Closing Date, the Parties covenant and agree that in such case, the
Parties shall deal with such Assumed Obligation pursuant to Section 2.11.

        2.7  Manufacturer/Vendor Warranties.  All manufacturer/vendor warranties
relating to the Assets (to the extent such warranties are transferable) shall be
deemed to be transferred to Landmark on the Closing Date pursuant to the Bill of
Sale and Assignment, without any further action on the part of Landmark or WAII.

        2.8  Costs and Expenses.  Except as otherwise provided in this Agreement
or any Related Agreement, all legal, accounting, brokerage, finders or other
costs or expenses incurred by Landmark or WAII in connection with the
transactions contemplated by this Agreement shall be borne by the Party who
incurs such costs.

        2.9  Allocation of Purchase Price.  The Purchase Price shall be
allocated among the Assets and the Non-Competition Agreement as set forth on
Schedule 2.9; and Landmark and WAII covenant and agree with each other that they
will not take a position on any income tax return, before any governmental
agency charged with the collection of any income tax, or in any judicial
proceeding, that is contrary to the allocation of the Purchase Price as set
forth on Schedule 2.9 and they each shall timely file such income  tax returns,
together with all forms or statements attached to such returns related to the
allocation of the Purchase Price as set forth on Schedule 2.9, including without
limitation IRS Form 8594.



                                   - 12 -
<PAGE>   18

        2.10  Transfer Taxes.  Landmark shall pay all sales, use, transfer,
recording, registration, stamp and value added taxes and fees arising out of the
transfer to Landmark of the Assets.

        2.11  WAII Engagement of Landmark.  WAII engages Landmark to perform all
of WAII's obligations which first become performable after the Agreement Date
under the documents evidencing the Non-Assigned Obligations.  Landmark agrees to
timely perform or discharge the Non-Assigned Obligations evidenced by such
documents on behalf of WAII in strict accordance with the terms of such
documents.

                (a)  Allocation of Payments.  WAII shall hold all sums received
        with respect to the Non-Assigned Obligations (to the extent that such
        sums relate to obligations performed after the Closing Date) for the
        benefit of Landmark and shall deliver such sums to Landmark within
        thirty (30) days following receipt of such funds.

                (b)  Assignment.  WAII and Landmark agree to use all reasonable
        efforts (and bear their respective costs of such efforts) without
        payment of any penalty or fee to obtain and secure any and all Required
        Consents that may be necessary to effect the valid sale, transfer or
        assignment of the Non-Assigned Obligations to Landmark without change in
        any of the material terms or conditions of such Non-Assigned
        Obligations, including, without limitation, the formal assignment or
        novation of such Non-Assigned Obligations, if so required.  WAII and
        Landmark further covenant and agree to make or complete such transfers
        as soon as reasonably possible and to cooperate with each other in any
        other reasonable arrangement designed to provide for Landmark the
        benefits of and to such Non-Assigned Obligations (to the extent that
        such benefits relate to obligations performed after the Closing Date)
        and to provide for the discharge of any obligation under such
        Non-Assigned Obligations (to the extent such obligations first become
        performable after the Closing Date).

                (c)  Other Actions.  WAII agrees to take, after the Closing
        Date, for Landmark's benefit, such actions as Landmark, may from time to
        time, reasonably request to enforce the obligations of the other parties
        to the Non-Assigned Obligations, including, without limitation, any
        agreements or provisions pertaining to payment, confidentiality,
        nondisclosure, compliance with export laws and regulations or
        restrictions on the use of any software application program(s) or other
        product(s) licensed to such other parties, provided that Landmark shall
        reimburse WAII for the reasonable costs and expenses of any such action.
        Unless otherwise requested in writing by Landmark, WAII shall terminate
        in accordance with its terms (or not renew or cause to be renewed) any
        Non-Assigned Obligations which (i) requires WAII to perform ongoing
        obligations and (ii) is not assigned to Landmark on or before December
        31, 1996.  The Parties will cooperate with each other to accomplish the
        actions contemplated by this Section 2.11(c).



                                   - 13 -
<PAGE>   19
        
                   (d)     Termination.  The provisions of this Section 2.11
         shall terminate as to each of the Non-Assigned Obligations upon the
         earlier to occur of (i) the expiration of such Non-Assigned Obligation
         or (ii) the assignment to Landmark and assumption by Landmark of such
         Non-Assigned Obligation pursuant to Section 2.3(b).


                                  ARTICLE III

                     REPRESENTATIONS AND WARRANTIES OF WAII

        WAII represents and warrants to Landmark as follows:

         3.1     Organization and Good Standing.  WAII is a corporation duly
organized, validly existing and in good standing under the laws of the State of
Delaware, with full corporate power and authority to carry on that portion of
the Business that relates to the Assets as presently conducted and to own, lease
and/or operate the Assets in the places where such portion of the Business is
now conducted.

         3.2     Authorization; Enforcement.  WAII has full corporate power and
authority to execute and deliver this Agreement and the Related Agreements to
which it is a party and to perform its obligations under this Agreement and such
Related Agreements in accordance with their respective terms.  WAII has taken
all necessary corporate action to duly and validly authorize the execution and
delivery of this Agreement and the Related Agreements to which it is a party and
the consummation of the transactions contemplated by this Agreement and such
Related Agreements.  This Agreement has been duly executed and delivered by WAII
and constitutes and, when executed, each of the Related Agreements to which WAII
is a party will be duly executed and will constitute, the valid and legally
binding obligations of WAII, enforceable against WAII in accordance with their
respective terms, except (i) to the extent that enforcement may be limited by
any bankruptcy, insolvency, reorganization, moratorium or similar laws now or
hereafter in effect relating to or affecting creditors' rights generally or (ii)
as the remedy of specific performance and injunctive and other forms of
equitable relief are subject to certain equitable defenses and to the discretion
of the court or other similar person before which any equitable proceeding may
be brought.




                                     - 14 -
<PAGE>   20

         3.3     No Conflicts; Compliance with Obligations; No Consents.  The
execution and delivery by WAII of this Agreement and the Related Agreements to
which it is a party, the performance by WAII of its obligations under this
Agreement and under such Related Agreements and the consummation of the
transactions contemplated by this Agreement or such Related Agreements will not:

                 (a)    conflict with or constitute a breach of or a default 
         under, the organizational documents of WAII;

                 (b)    conflict with, constitute a breach of or a default 
         (with or without notice or lapse of time or both) under, or give rise
         to any right of termination or acceleration under, any loan or credit
         agreement, note, indenture, mortgage, deed of trust, permit, license or
         other agreement,instrument or undertaking to which WAII is a party or
         by which any of the Assets are bound;

                 (c)    constitute a violation of any law, regulation, judgment,
         order or decree applicable to WAII, the Assets or the portion of the
         Business related to the Assets;

                 (d)    result in the creation or imposition of any Lien upon 
         any of the Assets; or

                 (e)    except as set forth on Schedule 3.3, require any 
         consent, approval, authorization or order of any Person or any 
         governmental agency (all of which, except as noted on Schedule 3.3, 
         have been obtained and are in full force and effect);

except for such occurrences described in clause (b) (other than with respect to
any material loan or credit agreement, note, indenture or mortgage), (c) or (e)
that, individually or in the aggregate, could not reasonably be expected to
have a material adverse effect on the Assets or that portion of the Business
which relates to the Assets or  the ability of WAII to perform its obligations
under this Agreement and the Related Agreements to which it is a party or to
consummate the transactions contemplated by this Agreement and such Related
Agreements.

         3.4     Title to Assets.  WAII has Good Title to the Assets, or has a
valid leasehold interest in or a valid right to use, the Assets, free and clear
of any Liens and has the right to convey such rights to Landmark pursuant to
this Agreement.  A complete list of all Equipment included among the Assets is
attached as Schedule 3.4.

         Intellectual Property and Software.

                 (a)    Owned.  Schedule 3.5(a) contains a true and complete 
         list of each item of Intellectual Property or Software owned by WAII
         that is to be conveyed by WAII to Landmark pursuant to this Agreement.
         Except as noted on Schedule 3.5(a), and to the Knowledge of WAII with
         respect to trademarks or service marks, with respect to each item of
         Intellectual Property or Software:



                                   - 15 -
<PAGE>   21

                (i)    no proceedings are pending against WAII, and WAII has not
        received written notice that any proceedings are threatened against
        WAII which challenge the validity, enforceability, use or ownership of
        the item;

                (ii)    the item, as it exists on the Closing Date, (A) does not
        infringe upon or otherwise violate the existing trade secret rights,
        trademarks, service marks, copyrights or patents of others or the
        patents of others which issue subsequent to the Agreement Date pursuant
        to patent applications filed on or before the Agreement Date, (B) to
        the Knowledge of WAII, is not being infringed upon by others, and (C)
        is not subject to any outstanding order, decree, judgment or
        stipulation;

                (iii)    WAII has not received any written claim or charge of
        infringement with respect to the item; and

                (vi)    WAII has supplied or made available to Landmark true and
        complete copies of all written documentation in its possession
        evidencing WAII's ownership of the item and of all licenses and other
        contracts in its possession related to such ownership.

        (b)    Used.  Schedule 3.5(b) contains a true and complete list of each
item of  intellectual property and each computer software applications program
which WAII does not own and which WAII practices or uses and that is material to
that portion of the Business which relates to the Assets.  Except as noted on
Schedule 3.5(b), with respect to each such item:

                (i)    any license agreement to which WAII is named as licensee
        covering the item is a valid and binding agreement;

                (ii)    no event has occurred which constitutes a breach by 
        WAII of such license agreement, WAII has not repudiated or breached and
        no other party to such license agreement has repudiated, in writing to
        WAII or, to the Knowledge of WAII, breached any provision of such
        license agreement and there are no disputes or oral arrangements in
        effect as to any such license agreement;

                (iii)    WAII has supplied Landmark with a true and complete 
        copy of all license agreements to which WAII is a party covering 
        such item; and

                (iv)    WAII has not received any written claim that the 
        exercise of the rights granted to WAII with respect to such item
        infringes upon the intellectual property rights of any third party.



                                   - 16 -
<PAGE>   22

        (c)    Business Activity.  WAII is not aware of any infringement,
misappropriation or violation of the proprietary rights of any third party
which will occur as a result of the transfer of the Assets pursuant to this
Agreement.

        (d)    Software Restrictions.  To the Knowledge of WAII, each item of
Software and each other software application program listed on Schedules 2.2(a),
3.5(a) and 3.5(b) is virus-free and contains no undisclosed time control
mechanisms.

        (e)    Protection of Trade Secrets.  Except as set forth in Schedule
3.5(e), WAII has not disclosed the information contained in the Software to
others so as to materially adversely affect the ability of Landmark to protect
such information as a trade secret.  Except as set forth in Schedule 3.5(e), the
employees and consultants of WAII who, either alone or in concert with others,
developed, invented, discovered, derived, programmed or designed any Software or
trade secrets embodied in or used in connection with the Software have entered
into written agreements to protect the confidentiality of such trade secrets and
the Software and to assign to WAII all proprietary rights in such trade secrets
and the Software. A copy of a form of such written agreements has been furnished
to Landmark.  Except as listed in Schedule 3.5(e), all of such employees and
consultants have signed written agreements having substantially the same legal
effect as the terms and conditions contained in such form.  WAII is not aware
that any employee or consultant of WAII who has signed such an agreement is in
violation of such agreement.

        (f)    Computer Software.  Except as set forth in Schedule 2.2(a) or
Schedule 3.5(b) the use and operation of the Software does not require access to
or the use of any other software (excluding operating system software).

        3.6    Contracts.

        (a)    Schedule of Contracts.  Schedule 3.6(a) contains a true and
complete list of all the following bids, proposals, tenders, executory contracts
and written arrangements to which WAII is a party relating to the portion of the
Business which relates to the Assets, true and complete copies of which have
been delivered to Landmark:

                (i)    with respect to each item of Intellectual Property and
        Software, all licenses, leases, sublicenses, sales, royalty,
        distribution, maintenance or service agreements in effect with respect
        to the item;

                (ii)    all contracts included in the Assumed Contracts 
        pursuant to which WAII leases personal or real property;



                                   - 17 -
<PAGE>   23

                (iii)  all contracts for the sale of products (other than
        Software) marketed or created by the Division or for the furnishing of
        maintenance or support services by the Division, which contract calls
        for performance over a period of more than six (6) months or that
        reasonably could be expected to require the future payment by or to WAII
        of $50,000.00 or more;

                (iv)  all joint venture agreements;

                (v)  all agreements pursuant to which any third party (other
        than employees of WAII or its Affiliates) provides services as a sales
        representative;

                (vi)  all agreements between or among one or more subsidiaries
        or Affiliates of WAII, on the one hand, and the Division or WAII, on the
        other hand;

                (vii)  all management, service, consulting, maintenance, support
        or similar types of agreements or contracts to which the Division or
        WAII is a party;

                (viii)  all bids, tenders and proposals relating to the use,
        licensing, sale, leasing or sublicensing of the Software; and

                (ix)  any other contract or arrangement included in the Assumed
        Contracts.

All contracts, leases, subleases, licenses, sublicenses, commitments and
agreements listed in Schedule 3.6 are in full force and effect and represent
valid and binding obligations of WAII and, to the Knowledge of  WAII, the other
parties to such contracts, leases, subleases, licenses, sublicenses,
commitments and agreements, enforceable against such Persons in accordance with
their terms.  WAII is not and, to the Knowledge of the WAII, no other party is
in breach or default, and no event has occurred on the part of WAII or, to the
Knowledge of WAII, on the part of any other party to any such contracts,
leases, subleases, licenses, sublicenses, commitments and agreements which with
notice or lapse of time would constitute a breach or default or permit
termination under any such contracts, leases, subleases, licenses, sublicenses,
commitments and agreements.  None of such contracts, leases, subleases,
licenses, sublicenses, commitments and agreements will, in accordance with
their respective terms, be terminated or modified, or otherwise give any party
to such contracts, leases, subleases, licenses, sublicenses, commitments and
agreements other than WAII the right to terminate or modify any such contracts,
leases, subleases, licenses, sublicenses, commitments and agreements, by reason
of the consummation of the transactions contemplated by this Agreement.  WAII
is not a party to any verbal contract or arrangement which, if reduced to
written form, would be required to be listed in Schedule 3.6 under the terms of
this Section 3.6(a).

        (b)  Prior Payments.  Except as set forth in Schedule 3.6, there have
been no security deposits, escrow payments, prepayments, advance payments or
similar payments made by any Persons with respect to the contracts, leases,
subleases, licenses, sublicenses, commitments and agreements listed on Schedule
3.6.




                                   - 18 -
<PAGE>   24

        3.7  Compliance with Law.  WAII has complied with all, and is not in
violation of any, statutes, laws, regulations, decrees and orders of the United
States or any state, municipality and agency (federal, state and local) or
foreign jurisdiction applicable to the Assets or that portion of the Business
which relates to the Assets, including, without limitation, safety, health and
environmental statutes, laws, regulations, decrees and orders of the United
States, and such states, municipalities, agencies and jurisdictions applicable
to the Assets or that portion of the Business which relates to the Assets,
except such failures to comply or violations which could not, individually or in
the aggregate, reasonably be expected to have a material adverse effect upon the
Assets or that portion of the Business which relates to the Assets.

        3.8  Customer List.  Schedule 3.8 is a true and complete list (the
"Customer List") of all Persons who were, as of the date thereof (which shall
not be more than ten days prior to the Agreement Date), customers of WAII with
respect to that portion of the Business which relates to providing maintenance
and/or support services with respect to the Software.

        3.9  Adverse Agreements and Changes.  WAII is not (i) a party to any
agreement or instrument, or subject to any rule or regulation or (ii) aware of
any pending event or condition, in either case which, individually or in the
aggregate, reasonably could be expected to have a material  adverse effect on
the Assets or that portion of the Business which relates to the Assets.

        3.10  Litigation and Claims.  There is not (a) pending or, to the
Knowledge of WAII, threatened, any litigation, action, suit, arbitration,
investigation, inquiry, audit, complaint, charge or other proceeding before or
by any court or government or regulatory agency or body to which WAII is a party
involving the Assets or that portion of the Business which relates to the
Assets, or to which the Assets or that portion of the Business which relates to
the Assets are subject, or which, individually or in the aggregate, reasonably
could be expected to have a material adverse effect on the ability of WAII to
perform its obligations under this Agreement or the Related Agreements to which
it is a party or to consummate the transactions contemplated by this Agreement
and such Related Agreements or (b) any judgment, writ, decree, injunction, rule
or order of any court, governmental department, commission, agency,
instrumentality or arbitrator which is outstanding and binding upon or
enforceable against the Assets or that portion of the Business which relates to
the Assets or which otherwise is outstanding against WAII and relates to that
portion of the Business which relates to the Assets or which otherwise enjoins
or prohibits or restricts in any respect the ability of WAII to perform its
obligations under this Agreement or such Related Agreements or to consummate the
transactions contemplated by this Agreement or such Related Agreements.




                                   - 19 -
<PAGE>   25

        3.11  Absence of Certain Developments.  Since December 31, 1995, WAII
has not, with respect to that portion of the Business which relates to the
Assets:

                (a)  suffered any damage or loss, whether or not covered by
        insurance, with respect to any material Asset (including any loss of
        WAII's rights to use or market any Intellectual Property or Software);

                (b)  sold, assigned, leased, licensed or otherwise transferred
        or granted any rights in or to any Asset (other than Intellectual
        Property or Software) other than in the ordinary course of business;

                (c)  except licenses of Software made in the ordinary course of
        business consistent with practices in effect on December 31, 1995, sold,
        assigned, transferred or granted any rights under any Intellectual
        Property or Software;

                (d)  suffered any material adverse change in the Assets or that
        portion of the Business which relates to the Assets;

                (e)  operated that portion of the Business which relates to the
        Assets other than in the ordinary course of business consistent with
        practices in effect on December 31, 1995; or

                (f)  changed its pricing, accounting or revenue recognition
        policies.

        3.12  Employee Benefit Plans.  Neither of WAII nor any ERISA Affiliate
has, with respect to any Multiemployer Plan, as defined in Section 3(37) of
ERISA, suffered or caused or will, as a result of the consummation of the
transactions contemplated in this Agreement, suffer or cause a "complete
withdrawal" or "partial withdrawal" as such terms are respectively defined in
Sections 4203 and 4205 of ERISA.

        3.13  Labor Matters.  WAII (in respect of that portion of the Business
which relates to the Assets) has no collective bargaining agreements between
WAII and a labor union and there are no current negotiations between WAII and a
labor union.  WAII (in respect of that portion of the Business which relates to
the Assets) is in substantial compliance with all applicable laws respecting
employment and employment practices, terms and conditions of employment and
wages and hours, and is not engaged in any unfair labor practice.  There is no
unfair labor practice complaint against WAII (in respect of that portion of the
Business which relates to the Assets) pending before the National Labor
Relations Board.  There is no labor strike, dispute, slowdown or stoppage
actually pending or, to the Knowledge of WAII, threatened against or affecting
WAII (in respect of that portion of the Business which relates to the Assets).
No grievance is pending which, if determined adverse to WAII, reasonably could
be expected to have a material adverse effect on the Assets or that portion of
the Business which relates to the Assets.



                                   - 20 -
<PAGE>   26

        3.14  Disclaimer.  EXCEPT FOR THE REPRESENTATIONS AND WARRANTIES MADE IN
THIS AGREEMENT AND THE RELATED AGREEMENTS, WAII MAKES NO REPRESENTATIONS OR
WARRANTIES, WHETHER WRITTEN OR ORAL, EXPRESS OR IMPLIED, AS TO THE ASSETS OR THE
BUSINESS, INCLUDING WITHOUT LIMITATION ANY WARRANTIES AS TO DESIGN,
FUNCTIONALITY, RELIABILITY, OPERABILITY OR CONDITION, MERCHANTABILITY OR
FITNESS, CAPACITY OR DURABILITY FOR ANY PARTICULAR PURPOSE OR PROFITABILITY.

                                  ARTICLE IV

                   REPRESENTATIONS AND WARRANTIES OF LANDMARK

        Landmark represents and warrants to WAII as follows:

        4.1  Organization and Good Standing.  Landmark is a corporation duly
organized, validly existing and in good standing under the laws of the state of
Delaware, with full corporate power and authority to carry on its business as
presently conducted and to own, lease and/or operate its properties in the
places where such business is now conducted.

        4.2  Authorization; Enforcement.  Landmark has full corporate power and
authority to execute and deliver this Agreement and the Related Agreements to
which it is a party and to perform its obligations under this Agreement and such
Related Agreements in accordance with their respective terms.  Landmark has
taken all necessary corporate action to duly and validly authorize its execution
and delivery of this Agreement and the Related Agreements to which it is a party
and the consummation of the transactions contemplated by this Agreement and such
Related Agreements.  This Agreement has been duly executed and delivered by
Landmark and this Agreement constitutes and, when executed, each of the Related
Agreements to which Landmark is a party will be duly executed and will
constitute, the valid and legally binding obligations of Landmark, enforceable
against Landmark in accordance with their respective terms, except (i) to the
extent that enforcement may be limited by any bankruptcy, insolvency,
reorganization, moratorium, or similar laws now or hereafter in effect relating
to or affecting creditors' rights generally or (ii) as the remedy of specific
performance and injunctive and other forms of equitable relief are subject to
certain equitable defenses and to the discretion of the court or other similar
person before which any equitable proceeding therefor may be brought.

        4.3  No Conflicts; Compliance with Obligations; No Consents.  The
execution and delivery by Landmark of this Agreement and the Related Agreements
to which it is a party, the performance by Landmark of its obligations under
this Agreement and under such Related Agreements and the consummation of the
transactions contemplated by this Agreement and such Related Agreements will
not:

                (a)  conflict with or constitute a breach of or a default under,
        the organizational documents of Landmark;



                                   - 21 -
<PAGE>   27

                (b)  conflict with, constitute a breach of or a default (with or
        without notice or lapse of time or both) under, or give rise to any
        right of termination or acceleration under, any loan or credit
        agreement, note, indenture, mortgage, deed of trust, permit, license or
        other agreement, instrument or undertaking to which Landmark is a party;

                (c)  constitute a violation of any law, regulation, judgment,
        order or decree applicable to Landmark; or

                (d)  except as set forth on Schedule 4.3, require any consent,
        approval, authorization or order of any Person or any governmental
        agency;

except for such occurrences described in clause (b) (other than with respect to
any material loan or credit agreement, note, indenture or mortgage), (c) or (d)
that, individually or in the aggregate, could not reasonably be expected to
have a material adverse effect on the ability of Landmark to perform its
obligations under this Agreement and the Related Agreements to which it is a
party or to consummate the transaction contemplated by this Agreement and such
Related Agreements.

                                  ARTICLE V

                            COVENANTS AND AGREEMENTS

        5.1  Use of Facilities.  [Intentionally Omitted]

        5.2  Employee and Labor Matters.

        (a)  WAII Retained Liabilities.  Except to the extent of any obligations
expressly assumed by Landmark pursuant to this Agreement or any Related
Agreement, WAII is and shall remain solely liable for compensation and benefits,
including without limitation severance pay and accrued vacations, if any, to
which its employees are entitled, whether by operation of law, under employment
contracts, pursuant to any Employee Benefit Plan, or pursuant to collective
bargaining agreements or union agreements to which WAII is a party or is bound,
pursuant to any bargaining obligation that WAII may have incurred under any
applicable federal or state law or otherwise. Except to the extent of any
obligations expressly assumed by Landmark pursuant to this Agreement or any
Related Agreement, Landmark is not obligated to succeed, nor shall it be deemed
to be a successor, to any employment contract, whether express or implied,
written or oral, or any collective bargaining agreement or Employee Benefit Plan
to which WAII is a party or that otherwise is binding upon WAII.  Without
limiting the generality of the foregoing, WAII agrees that:  (i) Landmark shall
not be bound by any contract of employment or collective bargaining agreement
that WAII may have entered into or be bound by, (ii) WAII will be solely
responsible for providing any notice to employees of WAII which may be required
pursuant to the Federal Worker Adjustment and Retraining Notification Act of
1988 ("WARN") or any similar applicable law and (iii) WAII will be solely
responsible for any liability or obligation which may accrue under WARN or such
other law as a result of improper or untimely notice by WAII.



                                   - 22 -
<PAGE>   28

        (b)  Solicitation of WAII Employees.  Landmark shall offer employment to
a substantial number of those employees of the Division set forth on Schedule
5.2(b)(i) on compensation and benefit (including stock option program
participation) terms comparable to those afforded other potential employees of
Landmark.  Landmark acknowledges and agrees that WAII shall be entitled to
retain all employees listed on Schedule 5.2(b)(ii) ("Retained Employees") and
neither Landmark nor its Affiliates shall solicit the employment of or employ
any Retained Employees (while they are employed by WAII and for a period of six
months thereafter) for a period of two (2) years after the Closing Date unless
WAII consents in writing to such employment.  Subject to the proviso of the
preceding sentence (i) WAII agrees to release any Person previously employed by
WAII who is to be employed by Landmark as contemplated by this Agreement from
any obligation to continue employment with WAII and (ii) to the extent requested
by Landmark, WAII will use its commercially reasonable efforts (but shall not be
obligated to incur any expense) to assist in the transition to the employ of
Landmark of any employees of WAII hired by Landmark.  All employees of WAII who
accept Landmark's offer of employment as contemplated by this Agreement are
sometimes collectively referred to as the "Transferring Employees" and such
Transferring Employees will be deemed to become employees of Landmark as of the
later of the Closing Date, the date of their acceptance of employment or such
later date as may be agreed to by both Landmark and such Transferring Employees.
Neither WAII nor its Affiliates shall solicit the employment of or employ any
Transferring Employees (while they are employed by Landmark and for six months
thereafter) for a period of two (2) years after the Closing Date unless Landmark
consents in writing to such employment.

        (c)  Business Employees.  If any of the employees of WAII listed on
Schedule 5.2(c) to whom Landmark extends an offer of employment does not accept
Landmark's offer of employment as of the Closing, then, upon written request by
Landmark, WAII will use reasonable efforts to cause such employees who remain in
the employ of WAII after the Closing ("Business Employees") to provide services
for and at the direction of Landmark in connection with the further development
of the Software (or substantially equivalent software in replacement of such
Software) during such time as they remain employed by WAII. Landmark will
reimburse WAII during the time such Business Employees perform services for
Landmark at the rate of $540/day for United States payroll Business Employees
performing services outside of the United States in an expatriate status and at
the rate of $430/day for all other Business Employees. In addition, Landmark
will reimburse WAII for all meals, lodging and travel expenses required in
connection with the performance by such Business Employees of such duties.  WAII
shall make such Business Employees available to Landmark for such period of time
as may be requested by Landmark, such period not to exceed six (6) months after
the Closing and shall not terminate any Business Employee employed by WAII as of
the Closing who is performing such services for Landmark until the expiration of
such period except for good cause as determined by WAII in good faith in its
sole discretion.




                                   - 23 -
<PAGE>   29

        (d)  Employee Benefit Plans.  WAII shall, at its sole cost and expense,
retain the responsibility for the payment of any amounts accrued, payable or
arising in connection with any Employee Benefit Plan, including, without
limitation, all obligations under Part 6 of Subtitle B of Title I of ERISA.
Landmark is not obligated to succeed, nor shall it be deemed to be a successor,
to any Employee Benefit Plan.  WAII acknowledges that Landmark will establish or
maintain such employee benefit plans as it deems, in its sole discretion,
necessary or appropriate, and that Landmark's obligation and liability, if any,
to provide employee benefits in connection with or as a result of the purchase
of the Assets shall be limited to those persons employed by Landmark after the
Closing Date.

        (e)  Severance Payments.  Each of WAII and Landmark shall remain
severally responsible for all severance pay or termination benefits payable to
any employee terminated by it on or prior to the Closing Date.  Following the
Closing Date, (i) Landmark shall be responsible for all severance or termination
pay that becomes payable to any Transferring Employee with respect to any
termination of employment of such Transferring Employee by Landmark, giving full
credit for the length of service of such employee recognized by WAII on the
Closing Date and (ii) WAII shall be responsible for all severance or termination
pay that becomes payable to its employees with respect to any termination of
employment of such employees by WAII.

        (f)  Length of Service.  For purposes of eligibility, vesting and level
of benefits under any employee benefit plan provided to the Transferring
Employees by Landmark, Landmark shall credit such Transferring Employees with
the length of service recognized by WAII under its Employee Benefit Plans under
policies in effect as of January 1, 1996.  Nothing in this Agreement shall be
deemed to require Landmark to retain any Transferring Employee for any minimum
period of employment.




                                   - 24 -
<PAGE>   30

        (g)  Treatment of Medical Benefits.  Landmark agrees to waive
application of any pre-existing conditions provision of Landmark's medical
insurance plan with respect to any Transferring Employee and any covered
dependent of such Transferring Employee for any medical condition of such
Transferring Employee or covered dependent unless such medical condition was or
would have been excluded as a pre-existing condition under the medical insurance
plans of WAII. Landmark will credit each Transferring Employee in WAII's group
medical insurance plan (who will be employed by Landmark in the United States),
for the current program plan year with eligible expenses incurred by, and claims
paid on behalf of such Transferring Employee pursuant to WAII's group medical
insurance plan for purposes of satisfying the deductible provisions and the
out-of-pocket maximum provisions under Landmark's medical insurance plan, but
only to the extent the Landmark program plan year overlaps with the WAII current
plan year.

        (h)  Vacation for Transferring Employees.

                (i)  Earned Vacation.  Landmark shall make available to each of
        the Transferring Employees vacation that was earned but not taken by
        such employee while employed by WAII.  During the one-year period
        following the Closing Date (the "Vacation Period"), WAII shall pay to
        Landmark, on the first day of each calendar quarter during the Vacation
        Period, the amount equal to one-quarter of the amount of the vacation
        accrual on the books and records of WAII on the Closing Date in respect
        of the Transferring Employees (the "Vacation Accrual"); provided,
        however, that (i) the Vacation Accrual shall be determined in accordance
        with generally accepted accounting principles consistently applied, (ii)
        WAII shall update the Vacation Accrual on a monthly basis through March
        31, 1996, and (iii) the Vacation Accrual for March 1996 will treat each
        of the Transferring Employees as if they were employees of WAII for the
        entire month; and provided further, however, that the first such
        quarterly payment shall be estimated and paid based on available
        information regarding those employees of WAII to whom Landmark offers
        employment (the "Offerees"), and the second such quarterly payment shall
        be adjusted as necessary based on the earned vacation of those Offerees
        who become Transferring Employees.

                (ii)  Personal Leave.  During the Vacation Period, Landmark
        shall make available to each of the Transferring Employees personal days
        equal to the number of vacation days which such Transferring Employee
        would have earned during the period between his or her last employment
        anniversary date and the Closing Date, if such Transferring Employee had
        been covered under Landmark's vacation plan during such period. Landmark
        shall not be obligated to pay a Transferring Employee for any such
        personal days that are not taken during the Vacation Period.



                                   - 25 -


<PAGE>   31
        (i)  Defined Contribution Plan.  Landmark has established a defined
contribution plan ("Landmark Plan").  WAII has established that certain
Retirement/Profit Sharing Plan (the "WAII Plan") and desires to make a direct
trustee-to-trustee transfer of the Transferring Employees' vested and unvested
account balances, if any, under the WAII Plan (the "Account Balances") to the
Landmark Plan.  As soon as practicable after the Closing Date, Landmark shall
either (i) provide WAII with an opinion letter of counsel reasonably acceptable
to WAII to the effect that the Landmark Plan and its related trust satisfy the
requirements for qualification under Sections 401(a) and 401(k) of the Code as
of the later of the effective date of the Landmark Plan or the Closing Date,
(ii) deliver to WAII a favorable determination letter issued by the IRS
evidencing that the Landmark Plan and its related trust satisfy the requirements
for the qualification under Sections 401(a) and 401(k) of the Code (a "Favorable
Determination Letter") as of the later of the effective date of the Landmark
Plan or the Closing Date, or (iii) provide WAII with a Favorable Determination
Letter dated within 12 months prior to the Closing Date together with a
representation to the effect that no event has occurred that would adversely
affect the qualification of the Landmark Plan under Sections 401(a) and 401(k)
of the Code.  Prior to any transfer of Account Balances to the Landmark Plan,
WAII shall either (i) provide Landmark with an opinion letter of counsel
reasonably acceptable to Landmark to the effect that the WAII Plan and its
related trust satisfy the requirements for qualification under Sections 401(a)
and 401(k) of the Code - 8 - as of the later of the effective date of the WAII
Plan or the Closing Date, (ii) deliver to Landmark a Favorable Determination
Letter issued by the IRS evidencing that the WAII Plan and its related trust
satisfy the requirements for the qualification under Sections 401(a) and 401(k)
of the Code (a "Seller Favorable Determination Letter") as of the later of the
effective date of the WAII Plan or the Closing Date, or (iii) provide Landmark
with a Seller Favorable Determination Letter dated within 12 months prior to the
Closing Date together with a representation to the effect that no event has
occurred that would adversely affect the qualification of the WAII Plan under
Sections 401(a) and 401(k) of the Code.  As soon as practicable following the
later of (i) December 31, 1996 or (ii) the receipt by WAII and Landmark of the
opinions or determination letters described in the preceding sentence, WAII
shall cause the trustee of the trust forming a part of the WAII Plan to transfer
the Account Balances of the Transferring Employees to the trust forming a part
of the Landmark Plan, and Landmark shall cause the trustee of the trust forming
a part of the Landmark Plan to accept the transfer of the Account Balances from
the trust forming a part of the WAII Plan, by the transfer of cash (or with
respect to participant loans granted prior to the Closing Date, if any, such
loans and any promissory notes or other documents evidencing or securing such
loans) and/or other property designated by WAII and acceptable to Landmark which
is held in the trust forming a part of the WAII Plan and which has an aggregate
value equal to the value of the Account Balances as of the date of transfer.
Upon the transfer of the Account Balances, Landmark shall cause the Landmark
Plan to discharge the obligations of the WAII Plan with respect to the Account
Balances, and the WAII Plan shall be relieved of such obligations.  WAII shall
provide to Landmark copies of such records concerning the WAII Plan and the
participation of the Transferring Employees in the WAII Plan as Landmark shall
reasonably request for purposes of administering the Landmark Plan.



                                   - 26 -
<PAGE>   32

        5.3  Confidentiality.

        (a)  WAII's Covenant.  WAII agrees, from and after the Closing Date, not
to disclose to any Person (other than Landmark and its representatives) or to
use, in any manner, any trade secret embodied in or used in connection with the
Intellectual Property, Software or Employee Intellectual Property/Software,
without the written consent of Landmark; provided, however, (i) WAII's use of
such trade secret under any rights retained or license or right granted to WAII
or obligations undertaken by WAII pursuant to this Agreement or any Related
Agreement and (ii) such disclosures which (A) are reasonably necessary to
exercise such licenses or rights or perform such obligations and (B) will not
materially adversely affect the value of the Software, will not be deemed to be
prohibited by this Section 5.3(a).

        (b)  Landmark's Covenant.  Landmark agrees, from and after the Closing
Date, not to disclose to any Person (other than WAII and its representatives),
or to use in any manner, any trade secret of WAII which (i) does not pertain
directly to the Assets or that portion of the Business related to the Assets or
(ii) relates to the modules, executables, libraries, applications and utility
programs for which Landmark is granted a license or right pursuant to Section
2.2(a)(i), without, in each case, the written consent of WAII; provided,
however, (A) Landmark's use of such trade secrets under any license or right
granted to Landmark or obligation undertaken by Landmark pursuant to this
Agreement or any Related Agreement and (B) such disclosures which (1) are
reasonably necessary to exercise such license or rights or to perform such
obligations and (2) will not materially adversely affect the value of the
modules, executables, libraries, applications and utility programs, will not be
deemed to be prohibited by this Section 5.3(b).

        (c)  This Section 5.3 will govern the confidentiality obligations of the
Parties with respect to the subject matter of this Agreement and the Related
Agreements.  "Confidential Information" shall mean, all information disclosed by
a Party to the other Party (under this Agreement or a Related Agreement) which
the disclosing Party marks as "confidential" or with a similar legend and all
information referenced in Sections 5.3(a), 5.3(b) and 5.5. Information (other
than information referenced in Sections 5.3(a), 5.3(b) and 5.5) which is not
marked in the foregoing manner will not be deemed to be "Confidential
Information."  Information disclosed by a Party to the other Party orally or
visually (other than information referenced in Sections 5.3(a), 5.3(b) and 5.5)
will not be deemed to be "Confidential Information" unless the disclosing Party
informs the receiving Party at the time of disclosure that such information is
Confidential Information and furnishes the receiving Party with a written
summary of the portions of such information which are Confidential Information
within fifteen days of the disclosure.  All obligations of confidentiality and
non-use (other than information referenced in Sections 5.3(a), 5.3(b) and 5.5)
will terminate seven (7) years after the initial disclosure of such Confidential
Information or two (2) years after the termination of the Western




                                   - 27 -


<PAGE>   33

Atlas Service Agreement whichever date is earlier.  Any Party receiving, or
having in its possession, Confidential Information of the other Party pursuant
to this Agreement or a Related Agreement shall (i) maintain the confidential
and proprietary status of such Confidential Information, except to the extent
reasonably necessary to exercise its rights or obligations under this Agreement
or a Related Agreement, (ii) protect such Confidential Information in the same
manner as it protects its own confidential and proprietary information, which
shall not be less than reasonable care, (iii) use the Confidential Information
only in connection with the performance of its obligations or exercise of its
rights under this Agreement or a Related Agreement; provided, however, that
such restrictions shall not apply to any Confidential Information that is (a)
in the public domain on the Agreement Date or thereafter becomes part of the
public domain through no fault of the obligated Party, (b) lawfully received by
the obligated Party without an obligation of confidentiality from a third party
which the obligated Party reasonably believes has the right to disclose such
Information, (c) released from the restrictions of this Section 5.3 by the
express written consent of the Party to which such information is deemed
Confidential Information, (d) already in the possession of the receiving Party
at the time of receipt of the information from the disclosing Party, provided
the receiving Party is not obligated pursuant to Sections 5.3(a) or (b) to the
disclosing Party to keep the information confidential, or (e) developed by the
obligated Party independently of information for which the obligated Party is
under an obligation of confidentiality to the other Party to keep confidential. 
Without limiting the generality of the foregoing, each Party shall use
reasonable efforts to obtain, if not already in place, confidentiality and
non-use agreements from its respective employees and independent contractors to
protect the Confidential Information of the other Party and cooperate to
enforce such agreements.  In the event that disclosure by a Party of any of the
Confidential Information referred to in this Section 5.3(c) is compelled by
judicial or administrative process or by other requirements of law, such Party
shall provide the other Party with prompt prior written notice of such
requirement so that such other Party may seek a protective order or other
appropriate remedy and/or waive compliance with the provisions of this Section
5.3.  In the event that such protective order or other remedy is not obtained
and such other Party does not waive compliance with the provisions of this
Section 5.3, the Party from whom the Compelled Disclosure is sought (i) shall
furnish only that portion of such Confidential Information which such Party is
advised by legal counsel is legally required, and (ii) shall cooperate with the
other Party (at the expense of the other Party) in the other Party's attempt to
contest such disclosure.



                                   - 28 -
<PAGE>   34

        (d)  Use of General Knowledge.  With regard to Business Employees and
any other employees of WAII or its Affiliates and the Transferring Employees who
have acquired knowledge or expertise as a result of designing, developing or
utilizing the Software, this Agreement and the Related Agreements shall not
restrict the use of such acquired knowledge or expertise by such Business
Employees or other employees of WAII or its Affiliates or the Transferring
Employees.  Such acquired knowledge or expertise is defined as the ability to
utilize concepts, know-how and techniques contained in the Software.
Notwithstanding the foregoing, except as expressly set forth in this Agreement
or any Related Agreement no license is given to the Business Employees or other
employees of WAII or its Affiliates to use the Intellectual Property or
Software.

        (e)  Enforcement.  Each of the Parties agrees that (i) a violation of
the covenants set forth in this Section 5.3 regarding the disclosure of trade
secrets and confidential information will cause irreparable injury to the
non-breaching Party for which adequate remedy at law is not available; and (ii)
the non-breaching Party will be entitled, as a matter of right, to obtain an
injunction, restraining order, or other equitable relief to restrain any
threatened or further breach of such covenants.

        5.4  Taking of Necessary Action.  Subject to the terms and conditions of
this Agreement, the Parties agree, subject to applicable laws, to use their
commercially reasonable best efforts to promptly take or cause to be taken all
actions and to promptly do or cause to be done all things necessary, proper or
advisable under applicable laws and regulations to consummate and make effective
the transactions contemplated by this Agreement and the Related Agreements.
Without limiting the foregoing, Landmark and WAII shall use their commercially
reasonable best efforts to maintain and make all filings with and obtain all
consents, approvals, and/or assurances from third parties and appropriate
governmental agencies and authorities necessary or advisable for the
consummation of the transactions contemplated by this Agreement.  Each Party
shall cooperate with the other in good faith to help the other satisfy its
obligations set forth in this Section 5.4.

        5.5  Press Releases.  Neither Landmark nor WAII shall make any press
release or other public disclosure of matters related to this Agreement or the
Related Agreements without the prior written consent of the other Party as to
the form and substance of such press release or other public disclosure and the
media in which it is to be made; provided, however, that nothing in this Section
5.5 shall be deemed to prohibit any Party from making any disclosure that is
required to fulfill such Party's disclosure obligations imposed by law, or from
making such disclosure as such Party deems advisable (upon advice of such
Party's legal counsel) in connection with the requirements of any securities law
or any securities exchange on which the equity securities of such Party are
listed; provided, however, that prior written notice is given to the other Party
to the extent reasonably possible.



                                   - 29 -
<PAGE>   35

        5.6    Change of Control of Landmark.

        (a)    Third Party Bid.  If, after the Closing, any Person makes a
proposal to Landmark to acquire a majority of the outstanding voting securities
of Landmark (calculated on a fully-diluted basis after giving effect to the
exercise, exchange or conversion of all then outstanding securities exercisable,
exchangeable or convertible into voting securities of Landmark that would remain
outstanding after the consummation of such proposed offer) or to acquire more
than fifty percent (50%) (by value) of the assets of Landmark, Landmark will,
subject to entering into a confidentiality agreement with WAII in form and
substance reasonably acceptable to Landmark and WAII, (i) provide notice to WAII
of the receipt and terms of such proposal and (ii) in the event the Board of
Directors of Landmark determines to pursue proposals from other potential
purchasers, use its best efforts to enable WAII to make an acquisition proposal,
subject to the fiduciary responsibilities of the Board of Directors under
applicable law.

        (b)    Change of Control.  If a Change in Control (as hereinafter
defined) of Landmark occurs and WAII is not the acquiring party obtaining such
control, and the separate corporate existence of Landmark ceases or Landmark
disposes of all or substantially all of its assets in conjunction with the
Change in Control or as part of a plan pursuant to which the Change in Control
occurs, then the terms and provisions of this Agreement and the Related
Agreements to which Landmark is a party shall be binding upon the Person into
which Landmark is merged, consolidated or combined or which acquired
substantially all of the assets of Landmark (the "Assuming Party") to the same
extent as such agreements would then be binding upon Landmark.  A "Change in
Control" shall mean the happening of any of the following events:

               (i)    An acquisition by any individual, entity or group (within
        the meaning of Section 13(d)(3) or 14(d)(2) of the Exchange Act) (an
        "Entity") of beneficial ownership (within the meaning of Rule 13d-3
        promulgated under the Exchange Act) of 40% or more of either (A) the
        then outstanding shares of common stock of Landmark (the "Outstanding
        Landmark Common Stock") or (B) the combined voting power of the then
        outstanding voting securities of Landmark entitled to vote generally in
        the election of directors (the "Outstanding Landmark Voting
        Securities"); excluding, however, the following acquisitions of
        Outstanding Landmark Common Stock and Outstanding Landmark Voting
        Securities:  (1) any acquisition directly from Landmark or underwriters
        retained by it, (2) any acquisition by Landmark, (3) any acquisition by
        any Employee Benefit Plan (or related trust) sponsored or maintained by
        Landmark or any corporation controlled by Landmark or (4) any
        acquisition by any Entity pursuant to a transaction which complies with
        clauses (1), (2) and (3) of subsection (ii) of this Section 5.6(b); or



                                   - 30 -
<PAGE>   36

                (ii)    Consummation by Landmark of a reorganization, merger or
        consolidation or sale or other disposition of all or substantially all
        of the assets of Landmark ("Business Combination"); excluding, however,
        such a Business Combination pursuant to which (1) all or substantially
        all of the individuals and entities who are the beneficial owners,
        respectively, of the Outstanding Landmark Common Stock and Outstanding
        Landmark Voting Securities immediately prior to such Business
        Combination own, directly or indirectly, more than 50% of,
        respectively, the outstanding shares of common stock, and the combined
        voting power of the then outstanding voting securities entitled to vote
        generally in the election of directors of the corporation resulting
        from such Business Combination (including, without limitation, a
        corporation which as a result of such transaction owns Landmark or all
        or substantially all of Landmark's assets either directly or through
        one or more subsidiaries) in substantially the same proportions as
        their ownership, immediately prior to such Business Combination, of the
        Outstanding Landmark Common Stock and Outstanding Landmark Voting
        Securities, as the case may be, (2) no Entity (other than any Employee
        Benefit Plan (or related trust) sponsored or maintained by Landmark or
        any corporation controlled by Landmark or such corporation resulting
        from such Business Combination) will beneficially own, directly or
        indirectly, 40% or more of, respectively, the outstanding shares of
        common stock of the corporation resulting from such Business
        Combination or the combined voting power of the outstanding voting
        securities of such corporation entitled to vote generally in the
        election of directors except to the extent that such ownership existed
        with respect to Landmark prior to the Business Combination and (3) at
        least a majority of the members of the board of directors of the
        corporation resulting from such Business Combination were members of
        the board of directors of Landmark at the time of the execution of the
        initial agreement, or of the action of the board of directors of
        Landmark, providing for such Business Combination; or

                (iii)    The approval by the stockholders of Landmark of a 
        complete liquidation or dissolution of Landmark.

        (c)     Breach After Change in Control.  If an Assuming Party becomes
bound to the terms of this Agreement and the Related Agreements pursuant to
Section 5.6(b), and thereafter fails, in any material respect, to honor or
otherwise breaches the terms of Sections 3.1, 3.2, 3.3 or Article V of the
Western Atlas Service Agreement, and such failure or breach is not cured within
30 days after written notice of such failure or breach (specifying in reasonable
detail such failure or breach) is given by WAII to the Assuming Party, then WAII
shall have the right to receive and use for its own benefit (at no cost or
charge to WAII) the source code for all Software (or software provided by
Landmark in replacement of any such Software as contemplated by the Western
Atlas Service Agreement) then used by WAII in its operations, software jointly
developed by Landmark and WAII, Landmark's Open Works software program (or any




                                   - 31 -
<PAGE>   37

successor/replacement product), and each Landmark owned software applications
program licensed by WAII from Landmark pursuant to one or more licenses which,
in the aggregate, permit the use of such software applications program by fifty
(50) or more concurrent users ("WAII Software"); provided that WAII's use of
such source code shall be limited to providing maintenance and support services
for WAII Software (either in conjunction with WAII's use of WAII Software or to
third parties to whom WAII has sold a license to use such WAII Software
pursuant to the Western Atlas Service Agreement). Such WAII Software may not be
sold, licensed or otherwise disposed of by WAII, except as permitted in this
Agreement or in a Related Agreement.

        5.7     Dispute Cooperation.  In the event that any Party shall
participate in any dispute, audit, suit, action, proceeding or investigation
concerning the business or affairs of that portion of the Business related to
the Assets conducted on or prior to the Closing (other than litigation between
Landmark and WAII), including without limitation investigations and the like
related to any tax audit, customer dispute or insurance claim, the other Party
shall, upon the request of such Party, cooperate fully with such Party in
connection therewith, which cooperation shall include, without limitation,
making available the relevant Transferring Employees or the relevant employees
of WAII (subject to matters involving confidential (in the sense of legal
proceedings), documents, records and privileged information of such Party and
except with respect to proceedings where the Parties may not be similarly
situated or have different defenses or cross-claims).  The Party requesting
cooperation shall reimburse the Party providing assistance for reasonable
out-of-pocket expenses (excluding salaries but including reasonable attorneys
fees) incurred by the Party providing such assistance.

        5.8     Agreement to Adopt Successor Tax Procedures.

                (a)    Remuneration Subject to Income Tax.  WAII and Landmark
        agree that with respect to Transferring Employees, they respectively
        meet the definitions of "predecessor" and "successor" as defined in
        Revenue Procedure 84-77.  WAII and Landmark further agree that, for
        purposes of reporting employee remuneration to the IRS on Forms W-2 and
        W-3 for the calendar year 1996, they will utilize the "Standard
        Procedure" described in Section 4 of Revenue Procedure 84-77.

                (b)    Remuneration Subject to F.I.C.A.  WAII and Landmark agree
        that, for purposes of reporting employee remuneration for F.I.C.A.
        purposes for the calendar year 1996, WAII meets the definition of
        "predecessor" and Landmark meets the definition of "successor" as
        defined in IRS Regulation Section 31.3121(a)(1)-1(b). WAII agrees to
        supply Landmark with respect to all Transferring Employees, all
        cumulative payroll information as of the Closing Date that Landmark
        shall require in order to employ IRS Regulation Section
        31.3121(a)(1)-1(b).



                                   - 32 -
<PAGE>   38

        5.9    Post-Closing Exchanges.  The Parties agree that they will
promptly transfer or deliver to each other any cash or other property received
by one Party which is the property of the other Party, including, without
limitation, any funds paid by WAII to Landmark at Closing pursuant to Section
2.5(a)(x) which WAII is obligated to refund to third parties.

        5.10   Broker's or Finder's Fees.  WAII shall indemnify and hold
Landmark harmless from and against any and all claims by any Person as a broker
or finder in connection with the sale and purchase of the Assets, directly or
indirectly, by reason of an agreement or understanding with WAII but not paid by
WAII.  Landmark shall indemnify and hold WAII harmless from and against any
claims by any Person, as a broker or finder in connection with the sale and
purchase of the Assets, directly or indirectly, by reason of an agreement or
understanding with Landmark but not paid by Landmark.

        5.11   Use and Removal of Trademarks, Logos, etc.  WAII authorizes
Landmark to use the logos, service marks and trademarks of WAII which are
currently affixed to the Assets in connection with the use of such Assets by
Landmark; provided, however that Landmark shall indemnify WAII for any loss
suffered or incurred by WAII solely as a result of such use.  As soon as
reasonably practicable, but, with respect to items of Software, in no event
later than the next general release of such item of Software, Landmark agrees to
remove or obliterate all corporate names, division names, copyright notices,
logos, service marks and trademarks of WAII which are included within or affixed
to the Assets but are not included among the Intellectual Property and to
replace all written documentation delivered to Landmark which references such
corporate names, division names, copyright notices, logos, service marks and
trademarks with new documentation which does not contain such references. Except
as contemplated by this Agreement or the Related Agreements, neither WAII nor
Landmark shall hold itself out to the public as representing the other Party.


                                   ARTICLE VI

                                INDEMNIFICATION

        6.1    Indemnification of Landmark.  WAII shall indemnify and hold
Landmark and its officers, directors and agents (collectively the "Buying
Interests") harmless from and against any assessment, loss, damage, liability,
cost, and expense (including, without limitation, interest, penalties,
consequential damages payable to a third party and reasonable attorneys' fees
but excluding consequential damages sustained directly by a Party to this
Agreement) (a "Loss") imposed upon or incurred by any of the Buying Interests,
or to which any such parties may be subject, resulting from:

                (i)      a breach of any agreement, covenant, representation
        or warranty of WAII contained in this Agreement or in any Related
        Agreement;



                                   - 33 -
<PAGE>   39

                (ii)      any breach by WAII on or prior to the Closing Date
        with respect to WAII's obligations pursuant to the Assumed Obligations;
        or

                (iii)      any indebtedness, obligation, liability, or claim of
        any nature of or against WAII not specifically assumed by Landmark
        pursuant to this Agreement.

        6.2     Indemnification of WAII.  Landmark shall indemnify and hold WAII
and its officers, directors and agents (collectively the "Selling Interests")
harmless from and against any Loss imposed upon or incurred by any of the
Selling Interests, or to which any such parties may be subject, resulting from:

                (i)    a breach of any agreement, covenant, representation or
        warranty of Landmark contained in this Agreement or in any Related
        Agreement; or

                (ii)   any indebtedness, obligation, liability, or claim of any
        nature of or against WAII specifically assumed by Landmark pursuant to
        this Agreement.

        6.3     Procedural Limitations on Indemnification.  Notwithstanding the
foregoing, entitlement to indemnification pursuant to this ARTICLE VI shall be
conditioned upon claims in respect of indemnification being submitted, if at
all, within two years from and after the Closing Date; provided, that the right
to indemnity in respect of matters provided for in this ARTICLE VI shall not be
barred on the basis that the amount of the claim has not been ascertained,
liquidated or reduced to final judgment on or before the expiration of the
aforesaid period so long as the claim has been identified and asserted on or
before such expiration.

        6.4     Claims for Reimbursement.  In the event that any of the Buying
Interests or any of the Selling Interests shall have (i) suffered any Loss or
(ii) received any notice of the commencement of any action, investigation or
other proceeding, or the making of any claim or demand by a third party (a
"Third-Party Claim") and in respect of which indemnification may be sought by
such Party pursuant to this ARTICLE VI, the Party who shall have suffered such
Loss or received such notice of such Third-Party Claim and who shall seek
indemnification in respect of such Loss or Third Party Claim (the "Indemnified
Party") shall give the Party from whom indemnification is sought (the
"Indemnifying Party") prompt written notice of such Loss or Third Party Claim,
setting forth in reasonable detail such information as it shall have pertaining
to such Third Party Claim and the Indemnified Party's demand for indemnification
in respect of such Third Party Claim.  Written notice of Third-Party Claims or
Loss shall be given to the Indemnifying Party as promptly as practicable (and in
any event within 30 days after the service of the citation or summons);
provided, however, that the failure of any Indemnified Party to give timely
notice shall not affect any right to indemnification if (i) such failure to give
timely notice does not materially affect the ability or right of the
Indemnifying Party to participate in the defense of such Third-Party Claim and
(ii) to the extent that such failure to give timely notice causes the
Indemnifying Party to incur additional expense with respect to such Third-Party
Claim, the Indemnified Party promptly reimburses the Indemnifying Party for such
additional expense.  The Indemnifying Party shall have 30 days from the date of
receipt of each such notice (the "Investigation Period") to investigate and
dispute the nature, validity or amount of any such Loss or Third-Party Claim.
During the Investigation period, the Indemnifying Party shall have reasonable
access, during normal business hours, to the books and records of the
Indemnified Party relating to such Third Party Claim.  In




                                   - 34 -


<PAGE>   40

the event that the Indemnifying Party shall dispute the nature, validity or
amount of a Third Party Claim under this Section 6.4, the Indemnifying Party
shall give the Indemnified Party written notice of such dispute within the
Investigation Period, and the Parties shall meet promptly after receipt of such
notice of dispute and in good faith attempt to resolve such dispute.  In the
absence of a dispute, the Indemnifying Party shall promptly, and in any event
not later than the expiration of the Investigation Period relating to a notice
of a Loss, reimburse the Indemnified Party in full for any Loss set forth in
such notice.

        6.5  Defense and Settlement of Third-Party Claims.  In the event that an
Indemnifying Party acknowledges its obligation to indemnify the other Party for
a Third-Party Claim, then the Indemnifying Party shall have the option to take
control of the defense and investigation of such Third-Party Claim and to employ
and engage attorneys of its own choice (who are reasonably satisfactory to the
Indemnified Party) to handle and defend the same, at the Indemnifying Party's
sole cost, risk and expense (the "Direct Litigation Option").  The Indemnifying
Party may elect to exercise the Direct Litigation Option by giving prior written
notice of its election to the Indemnified Party. If the Indemnifying Party so
elects, the Indemnified Party shall cooperate (at the expense of the
Indemnifying Party) in all reasonable respects with the Indemnifying Party and
such attorneys in the investigation, trial and defense of such Third-Party Claim
and any appeal arising from such claim; provided, however, that the Indemnified
Party may, at its own cost, participate in (but not control) such investigation,
trial and defense of such Third-Party Claim and any appeal arising from such
claim.  If the Indemnifying Party does not elect the Direct Litigation Option,
then the Indemnified Party may defend against the Third-Party Claim in the
manner it deems appropriate.  The Indemnified Party (or the Indemnifying Party
if it has exercised the Direct Litigation Option) may settle a Third-Party Claim
upon 30 days prior written notice (the "Settlement Review Period") to the other
Party, and such settlement shall be binding upon all the Parties; provided,
however, that if within the Settlement Review Period the Indemnifying Party
shall have acknowledged its obligation to indemnify and objected to such
settlement, the Indemnified Party shall permit the Indemnifying Party to defend
the claim on its behalf and at its expense, provided that the Indemnifying Party
shall keep the Indemnified Party advised on a timely basis of all developments
with respect to such claim and permit the Indemnified Party to participate, at
its election and expense, in the defense of such claim; and, provided further,
that no settlement will be


                                   - 35 -

<PAGE>   41


made by the Indemnifying Party without the consent of the Indemnified Party
unless such settlement includes a complete release of the Indemnified Party.
Any payment or settlement resulting from such contest which is made in
accordance with this Section 6.5, together with the total expenses of such
contest, shall be binding on the Parties for purposes of this Agreement.  In no
event shall a Party enter into any settlement, adjustment or compromise of any
Third-Party Claim without the prior written consent of the other Party (which
consent shall not be unreasonably withheld or delayed), if as a result of such
settlement, adjustment or compromise (i) an injunction or other non-monetary
relief would be imposed against the Indemnified Party, or (ii) the Business
would suffer a material adverse effect.  Notwithstanding the foregoing, in
connection with a Third Party Claim asserted against an Indemnified Party, if
(i) the Indemnified Party has available to it defenses which are in addition to
those available to the Indemnifying Party, (ii) the Indemnified Party has
available to it defenses which are inconsistent with the defenses available to
the Indemnifying Party or (iii) a conflict exists or may reasonably be expected
to exist in connection with the representation of both the Indemnified Party
and the Indemnifying Party by the legal counsel chosen by the Indemnifying
Party, the Indemnified Party will have the right to select its own legal
counsel subject to the approval of such legal counsel by the Indemnifying
Party, such approval not to be unreasonably withheld.  If the Indemnified Party
selects its own legal counsel pursuant to the immediately preceding sentence
and the underlying Third Party Claim is otherwise subject to the scope of the
indemnification obligations of the Indemnifying Party pursuant to this ARTICLE
VI, the reasonable fees and expenses of such legal counsel will be included
within the indemnification obligations of the Indemnifying Party; provided that
under no circumstances will the Indemnifying Party be obligated to indemnify
the Indemnified Parties against the fees and expenses of more than one legal
counsel selected by them in connection with a single claim.

        6.6  Monetary Limitations on Indemnification.

                (a)  Basket.  Notwithstanding anything to the contrary contained
        in this ARTICLE VI, neither Landmark nor WAII shall be obligated to pay
        any claims for indemnification pursuant to this ARTICLE VI until the
        aggregate of all Losses sustained or incurred by the other Party equals
        or exceeds an amount equal to $300,000.00 (the "Basket"); provided,
        however, Landmark's obligation to pay the Purchase Price shall be
        absolute and cannot be offset against the Basket.  After the aggregate
        of all Losses sustained or incurred by a Party exceeds the Basket,
        indemnification shall be paid for all additional claims incurred;
        provided, however, there shall be no indemnification for claims which
        comprise the Basket.

                (b)  Actual Knowledge.  An Indemnifying Party shall not be
        obligated to indemnify an Indemnified Party under this ARTICLE VIfor a
        Loss resulting from any event relating to a breach of any representation
        or warranty made by the Indemnifying Party if the Indemnifying Party can
        establish that the Indemnified Party had actual knowledge of the breach
        and the extent thereof on or before the Closing Date and proceeded to
        consummate the transactions contemplated by this Agreement and the
        Related Agreements.



                                   - 36 -



<PAGE>   42


                (c)  Maximum Liability.  The maximum aggregate liability of an
        Indemnifying Party under this Article VI (regardless of whether such
        action is brought in contract, in tort or pursuant to some other theory)
        shall not exceed $15,000,000.00.

        6.7  Arbitration.

                (a)  General.  The Parties agree that all actions, claims,
        controversies or disputes of any kind (e.g. whether in contract or in
        tort, statutory or common law, legal or equitable or otherwise)
        ("Disputes") between them relating, directly or indirectly, to this
        Agreement or the Related Agreements are to be resolved by arbitration as
        provided in this Agreement. This agreement to arbitrate will survive the
        termination of this Agreement. All arbitration will be conducted
        pursuant to and in accordance with the following order of priority (i)
        the terms of this Agreement and the Related Agreements, (ii) the
        Commercial Arbitration Rules of the American Arbitration Association,
        and (iii) to the extent the foregoing are inapplicable, unenforceable or
        invalid, the laws of the State of Texas.  The arbitrator(s) used will be
        selected from a list of persons familiar with disputes regarding the
        acquisition of software businesses and software licenses to be provided
        by the American Arbitration Association.  Any hearing regarding
        arbitration will be held in Houston, Texas, or at another location
        mutually acceptable to Landmark and WAII. The Parties will use
        reasonable efforts to assure that the arbitrator(s) will use their best
        efforts to conduct the arbitration hearing as soon as practicable.

                (b)  Discovery.  Discovery will be conducted solely through
        depositions and requests for documents and things but otherwise will be
        governed by the Federal Rules of Civil Procedure. The arbitrator(s) will
        resolve any discovery disputes by such prehearing conferences as may be
        needed. All Parties agree that the arbitrator(s) will have the power of
        subpoena process as provided by law.  Disputes concerning the scope of
        depositions or document production, its reasonableness and enforcement
        of discovery requests will be subject to agreement by the Parties or
        will be resolved by the arbitrator(s).  All discovery requests will be
        subject to the proprietary rights and rights of privilege and other
        protections granted by applicable law to the Parties.  The arbitrator(s)
        will adopt procedures to protect such rights.  With respect to any
        Dispute, each Party agrees that all discovery activities shall be
        expressly limited to matters directly relevant to the Dispute and the
        arbitrator(s) will be required to fully enforce this requirement.

                (c)  Enforcement.  The decision of the arbitrator(s) will be
        final and binding on all Parties.  Any judgment upon the award rendered
        by the arbitrator(s) may be entered in any court having jurisdiction
        thereof. The decision of the arbitrator(s) will be enforceable in any
        court of competent jurisdiction. Except for proceedings seeking
        equitable remedies, an arbitration proceeding commenced pursuant to this
        Section 6.7 is a condition precedent to and is a complete defense to the
        commencement of any suit, action or proceeding in any federal or state
        court with respect to any Dispute. Either Party may bring an action in
        court to compel arbitration.  Any Party who fails or refuses to submit
        to binding arbitration following demand by the other Party shall bear
        all costs and expenses incurred by the opposing Party in compelling
        arbitration.




                                   - 37 -
<PAGE>   43
                (d)  Powers and Qualifications; Awards; Modification or Vacation
        of Award.  The arbitrator(s) are empowered to resolve Disputes by
        summary rulings substantially similar to summary judgments and motions
        to dismiss.  The arbitrator(s) will resolve all Disputes in accordance
        with the substantive laws of the State of Texas.  The arbitrator(s) may
        grant any remedy or relief deemed just and equitable and within the
        scope of this Agreement and may also grant such ancillary relief as is
        necessary to make effective any award.  The arbitrator(s) will be
        required to make specific, written findings of fact and conclusions of
        law, and the Parties will have the right to seek vacation or
        modification of an award only if (i) that award is based in whole, or in
        part, upon fraud or (ii) failure to follow the procedures set forth in
        this Section 6.7.  For these purposes, the award and judgment entered by
        the federal or state district court shall be considered to be the same
        as the award and judgment of the arbitrator(s).  To the extent permitted
        by applicable law, the arbitrator(s) will have the power to award
        recovery of all costs and fees (including attorneys' fees,
        administrative fees, and arbitrators' fees) to the prevailing Party.

                (e)  Limitation on Award.  The arbitrator(s) will be limited to
        interpreting the applicable provisions of this Agreement and the Related
        Agreements, and will not have the authority or power to alter, amend,
        modify, revoke or suspend any condition or provision of this Agreement
        or the Related Agreements, nor to create, draft or form a new agreement
        between the Parties, nor to render an award which, by its terms, has the
        effect of altering or modifying any condition or provision of this
        Agreement or the Related Agreements.

                (f)  Provisional Remedies and Multiple Parties.  No provision
        of, nor the exercise of any rights under, this Agreement or the Related
        Agreements will limit the right of any Party, during any Dispute, to
        resort to a court of applicable jurisdiction to seek such equitable
        remedies as may be available to such Party, and any such action will not
        be deemed an election of remedies.  Such rights will include, without
        limitation, rights and remedies relating to injunctive relief. Such
        rights may be exercised at any time except to the extent such action is
        contrary to an award or decision of the arbitrator(s).  The institution
        and maintenance of an action for equitable relief will not constitute a
        waiver of the right of any Party, to submit a Dispute to arbitration,
        nor render inapplicable the compulsory arbitration provisions of this
        Agreement.




                                   - 38 -

<PAGE>   44

                (g)  Choice of Arbitrator(s).  The arbitrator(s) will be chosen
        by mutual agreement of Landmark and WAII.  If they cannot agree within
        30 days upon a single arbitrator, each will, within 15 days thereafter,
        appoint an arbitrator and such arbitrators will appoint a third
        impartial arbitrator.  If more than one arbitrator is appointed, the
        decision of a majority of such arbitrators will be binding. Subject to
        the provisions of Section 6.7(d), (i) each Party will be responsible for
        the expenses and fees of the arbitrator appointed by it and one-half of
        the fees and expenses of the third arbitrator, (ii) if there is only one
        arbitrator appointed, WAII and Landmark will each be responsible for
        one-half of the fees and expenses of such arbitrator and (iii) each
        Party will bear its own attorney's and expert's fees. If either Party
        fails to timely appoint an arbitrator, the decision of the arbitrator
        who is timely appointed will be binding.

        6.8  Exclusive Remedies.  Except with respect to proceedings seeking
equitable remedies to enforce the provisions of this Agreement, the
indemnification provisions of this ARTICLE VI shall be the exclusive remedy of
the Parties for any breach of the representations, warranties or covenants of
this Agreement or the Related Agreements.  To the extent this Agreement permits
a Party to seek equitable remedies, the Parties acknowledge and agree that no
such proceeding may include a damages remedy.

                                  ARTICLE VII

                                 MISCELLANEOUS

        7.1  Effect of Due Diligence.  Except as noted in Section 6.6(b), no
investigation by Landmark or WAII into the business, operations and condition of
the other shall diminish in any way the effect of any representations or
warranties made by either Party in this Agreement or shall relieve such Party of
any of its obligations under this Agreement.




                                   - 39 -
<PAGE>   45

        7.2  Notices.  All approvals, consents, notices, requests, demands and
other communications shall be in writing and shall be deemed to have been duly
given upon delivery, if delivered in person or by any expedited delivery service
which provides proof of delivery; when electronically confirmed, if sent by
telefacsimile; or on the third business day after mailing, if mailed by
certified mail, postage prepaid, return receipt requested:

             (a)  To WAII:             Western Atlas International, Inc.
                                       10205 Westheimer Road
                                       Houston, Texas  77042
                                       Attn:  General Counsel
                                       Telephone: (713) 972-4915
                                       Telecopy: (713) 266-1717

              With a copy (which
              shall not constitute
              notice) to:              Western Atlas Inc.
                                       360 North Crescent Drive
                                       Beverly Hills, California  90210
                                       Attn: General Counsel
                                       Telephone: (310) 888-2700
                                       Telecopy:  (310) 888-2848

              (b)  To Landmark:        Landmark Graphics Corporation
                                       15150 Memorial Drive
                                       Houston, Texas   77079
                                       Attn: Corporate Secretary
                                       Telephone: (713) 560-1422
                                       Telecopy: (713) 560-1383

              With a copy (which
              shall not constitute
              notice) to:              Winstead Sechrest & Minick P.C.
                                       5400 Renaissance Tower
                                       1201 Elm Street
                                       Dallas, Texas  75270
                                       Attn: Robert E. Crawford, Esq.
                                       Telephone:  (214) 745-5120
                                       Telecopy: (214) 745-5390

        7.3  Entire Agreement.  This Agreement, the Related Agreements and the
other instruments contemplated in this Agreement and the Related Agreements
contain the entire agreement of WAII and Landmark with respect to the
transactions contemplated in this Agreement and no representation, promise,
inducement or statement or intention relating to the transactions contemplated
by this Agreement and the Related Agreements has been made by any Party which is
not set forth in this Agreement and the Related Agreements or in any Schedule or
Exhibit attached to this Agreement and the Related Agreements or any certificate
delivered in accordance with its terms.



                                   - 40 -
<PAGE>   46

        7.4  Amendments.  This Agreement may not be modified or amended except
by an instrument in writing signed by each of WAII and Landmark.

        7.5  Survival.  Subject to the provisions of ARTICLE VI, all
representations and warranties made by WAII and Landmark in this Agreement and
all covenants and agreements contained in this Agreement to be performed after
the Closing Date shall survive after the Closing Date.

        7.6  Assignments.  This Agreement may not be assigned by Landmark
without the prior written consent of WAII, except that Landmark may assign this
Agreement to one or more corporations or other entities which it controls;
provided, however, that in the event of any such assignment, Landmark shall
remain primarily liable for all of its obligations under this Agreement.  This
Agreement may not be assigned by WAII without the prior written consent of
Landmark, except that WAII may assign this Agreement to Western Atlas Inc.
("WAI"), the corporate parent of WAII, or to one or more corporations or other
entities which it controls or which is under common control with WAI; provided,
however, that in the event of any such assignment, WAII shall remain primarily
liable for all of its obligations under this Agreement.

        7.7  Counterparts.  This Agreement may be executed simultaneously in any
number of counterparts, each of which shall be deemed an original but all of
which together shall constitute one and the same instrument.

        7.8  Section Headings.  The Section headings are for convenience of
reference only and shall not constitute a part of this Agreement.

        7.9  GOVERNING LAW.  THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED
IN ACCORDANCE WITH, THE LAWS OF THE UNITED STATES AND THE STATE OF TEXAS AND
WILL, TO THE MAXIMUM EXTENT PRACTICABLE, BE DEEMED TO CALL FOR PERFORMANCE IN
HARRIS COUNTY, TEXAS.  FEDERAL AND STATE COURTS IN HARRIS COUNTY TEXAS WILL HAVE
EXCLUSIVE JURISDICTION OVER ANY EQUITABLE PROCEEDINGS BROUGHT BY A PARTY WITH
RESPECT TO THE SUBJECT MATTER OF THIS AGREEMENT OR ANY RELATED AGREEMENT.

        7.10  Further Assurances.  At, and from time to time after the Agreement
Date, at the request of any Party, but without further consideration, each Party
requested to do so shall execute and deliver such other instruments of
conveyance, assignment, transfer and delivery and take such other action as any
other Party may reasonably request in order more effectively to consummate the
transactions contemplated by this Agreement.

        7.11  No Third Party Beneficiaries.  Except as expressly provided in
ARTICLE VI and in Section 2.2(e), no Person not a Party to this Agreement shall
be deemed to be a third-party beneficiary under this Agreement or entitled to
any rights under this Agreement.






                                   - 41 -

<PAGE>   47
        7.12  Severability.  In the event that any provision of this Agreement,
or the application of such provision to any person or circumstance, is held by a
court of competent jurisdiction to be invalid, illegal or unenforceable in any
respect under present or future Laws effective during the effective term of any
such provision, such invalid, illegal or unenforceable provisions shall be fully
severable; and this Agreement shall then be construed and enforced as if such
invalid, illegal or unenforceable provision had not been contained in this
Agreement; and the remaining provisions of this Agreement shall remain in full
force and effect and shall not be affected by the illegal, invalid, or
unenforceable provision or by its severance from this Agreement.  Furthermore,
in lieu of each such illegal, invalid, or unenforceable provision, there shall
be added automatically as part of this Agreement a provision as similar in terms
to such illegal, invalid, or unenforceable provision as may be possible and be
legal, valid and enforceable.

        7.13  ACKNOWLEDGEMENT OF LANDMARK.  LANDMARK ACKNOWLEDGES THAT IT IS NOT
RELYING UPON ANY STATEMENTS, REPRESENTATIONS OR WARRANTIES OF WAII, WHETHER
WRITTEN OR ORAL, EXPRESS OR IMPLIED, OTHER THAN THE EXPRESS REPRESENTATIONS AND
WARRANTIES  MADE IN THIS AGREEMENT AND THE RELATED AGREEMENTS.





                                     - 42 -
<PAGE>   48
                             INDEMNIFICATION NOTICE

        UNDER CERTAIN CIRCUMSTANCES, THIS AGREEMENT (PARTICULARLY ARTICLE VI OF
THIS AGREEMENT) IMPOSES INDEMNIFICATION OBLIGATIONS UPON THE PARTIES.

        IN WITNESS WHEREOF, this Agreement has been executed by Landmark and
WAII as of the Agreement Date.

                                        Landmark:

                                        LANDMARK GRAPHICS CORPORATION,
                                        a Delaware corporation

                                        By:  /s/ JOHN W. GIBSON, JR.
                                           ---------------------------------    
                                             Name: John W. Gibson, Jr.
                                             Title: Executive Vice President
                                 



                                        WAII:

                                        WESTERN ATLAS INTERNATIONAL, INC.,
                                        a Delaware corporation



                                        By:  /s/ EMIL J. MATEKER, JR.
                                           --------------------------------- 
                                             Name: Emil J. Mateker, Jr.
                                             Title: Senior Vice President
                                 





                                     - 43 -

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
quarterly filing on Form 10-Q for the period ended March 31, 1996 and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          JUN-30-1996
<PERIOD-START>                             JUL-01-1995
<PERIOD-END>                               MAR-31-1996
<CASH>                                          55,028
<SECURITIES>                                         0
<RECEIVABLES>                                   49,042
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<INVENTORY>                                      4,153
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<PP&E>                                          90,583
<DEPRECIATION>                                  42,941
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<BONDS>                                              0
<COMMON>                                           875
                                0
                                          0
<OTHER-SE>                                     160,427
<TOTAL-LIABILITY-AND-EQUITY>                   213,382
<SALES>                                         79,778
<TOTAL-REVENUES>                               133,320
<CGS>                                           27,052
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<OTHER-EXPENSES>                                     0
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<INCOME-TAX>                                       261
<INCOME-CONTINUING>                                705
<DISCONTINUED>                                       0
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<CHANGES>                                            0
<NET-INCOME>                                       705
<EPS-PRIMARY>                                      .04
<EPS-DILUTED>                                      .04
        

</TABLE>


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