Document:

<PAGE>

                                                                    EXHIBIT 10.5

                      THIRD AMENDMENT TO CREDIT AGREEMENT
                      -----------------------------------

                                  BY AND AMONG

                           ATP OIL & GAS CORPORATION,
                                  AS BORROWER,

                                  BNP PARIBAS,
                            AS ADMINISTRATIVE AGENT,

                                      AND

                          THE LENDERS SIGNATORY HERETO

                         EFFECTIVE AS OF JUNE 30, 2001
<PAGE>

                               TABLE OF CONTENTS
                               -----------------

<TABLE>
<CAPTION>

<S>               <C>                                                                                  <C>
ARTICLE I.        DEFINITIONS...........................................................  1
Section 1.01      Terms Defined Above...................................................  1
Section 1.02      Terms Defined in Credit Agreement.....................................  1
Section 1.03      Other Definitional Provisions.........................................  1

ARTICLE II.       AMENDMENTS TO CREDIT AGREEMENT........................................  2
Section 2.01      Amendments and Supplements to Definitions.............................  2
Section 2.02      Amendments to Article II..............................................  2
Section 2.03      Amendments to Article IX..............................................  3
Section 2.04      Amendments to Schedules...............................................  3

ARTICLE III.      CONDITIONS............................................................  3
Section 3.01      Loan Documents........................................................  3
Section 3.02      Corporate Proceedings of Loan Parties.................................  3
Section 3.03      Representations and Warranties........................................  3
Section 3.04      No Default............................................................  3
Section 3.05      No Change.............................................................  3
Section 3.06      Security Instruments..................................................  3
Section 3.07      Other Instruments or Documents........................................  3
Section 3.08      Amendment Fee.........................................................  3

ARTICLE IV.       MISCELLANEOUS.........................................................  4
Section 4.01      Adoption, Ratification and Confirmation of Credit Agreement...........  4
Section 4.02      Successors and Assigns................................................  4
Section 4.03      Counterparts..........................................................  4
Section 4.04      Number and Gender.....................................................  4
Section 4.05      Entire Agreement......................................................  4
Section 4.06      Invalidity............................................................  4
Section 4.07      Titles of Articles, Sections and Subsections..........................  4
Section 4.08      Governing Law.........................................................  5
</TABLE>

                                       i
<PAGE>

                      THIRD AMENDMENT TO CREDIT AGREEMENT
                      -----------------------------------

     This THIRD AMENDMENT TO CREDIT AGREEMENT (this "Third Amendment") executed
effective as of the 30th day of June, 2001 (the "Effective Date"), is by and
among ATP OIL & GAS CORPORATION, a corporation formed under the laws of the
State of Texas (the "Borrower"); each of the lenders that is a signatory hereto
or which becomes a signatory hereto and to the hereinafter described Credit
Agreement as provided in Section 12.06 of the Credit Agreement (individually,
together with its successors and assigns, a "Lender" and, collectively, the
"Lenders"); and BNP PARIBAS, a financial institution formed under the laws of
France (in its individual capacity, "Paribas"), as agent for the Lenders (in
such capacity, together with its successors in such capacity, the
"Administrative Agent").

                              W I T N E S S E T H:
                              - - - - - - - - - -

     WHEREAS, the Borrower, Administrative Agent and Lenders are parties to that
certain Credit Agreement dated as of April 27, 2001 as amended and supplemented
by that certain First Amendment to Credit Agreement dated as of June 29, 2001
and that certain Second Amendment to Credit Agreement dated as of June 29, 2001
(the "Credit Agreement"), pursuant to which the Lenders agreed to make loans to
and extensions of credit on behalf of the Borrower; and

     WHEREAS, the Borrower, and the Lenders desire to amend the Credit Agreement
in the particulars hereinafter provided;

     NOW, THEREFORE, in consideration of the premises and the mutual covenants
herein contained, the parties hereto agree as follows:

                             ARTICLE I. DEFINITIONS

     Section 1.01  Terms Defined Above.  As used in this Third Amendment, each
of the terms "Borrower", "Credit Agreement", "Effective Date", "Third
Amendment", and "Lenders" shall have the meaning assigned to such term
hereinabove.

     Section 1.02  Terms Defined in Credit Agreement.  Each term defined in the
Credit Agreement and used herein without definition shall have the meaning
assigned to such term in the Credit Agreement, unless expressly provided to the
contrary.

     Section 1.03  Other Definitional Provisions.

     (a) The words "hereby", "herein", "hereinafter", "hereof", "hereto" and
"hereunder" when used in this Third Amendment shall refer to this Third
Amendment as a whole and not to any particular Article, Section, subsection or
provision of this Third Amendment.

     (b) Section, subsection and Exhibit references herein are to such Sections,
subsections and Exhibits to this Third Amendment unless otherwise specified.

                                       1
<PAGE>

                  ARTICLE II.  AMENDMENTS TO CREDIT AGREEMENT

     The Borrower, the Administrative Agent, and the Lenders agree that the
Credit Agreement is hereby amended, effective as of the Effective Date, in the
following particulars.

     Section 2.01  Amendments and Supplements to Definitions.

     (a)  The following term, which is defined in Section 1.02 of the Credit
Agreement, is hereby amended in its entirety to read as follows:

          "Agreement" shall mean this Credit Agreement, as amended and
     supplemented by the First Amendment, the Second Amendment and the Third
     Amendment and as the same may from time to time be further amended or
     supplemented.

     (b) Section 1.02 of the Credit Agreement is hereby further amended and
supplemented by adding the following new definition where alphabetically
appropriate, which reads in its entirety as follows:

          "Third Amendment" shall mean that certain Third Amendment to Credit
     Agreement dated as of July 31, 2001, by and among the Borrower, the
     Administrative Agent and the Lenders.

     Section 2.02  Amendments to Article VIII.

     (a) Section 8.11(a) of the Credit Agreement is hereby amended to replace
the reference to "July 31, 2001" contained therein with "December 31, 2001".

     Section 2.03  Amendments to Article IX.

     (a) Section 9.04 of the Credit Agreement is hereby amended by replacing the
figure "$500,000" appearing therein with the figure "$1,000,000".

     (b) Section 9.13 of the Credit Agreement is hereby amended in its entirety
to read as follows:

          "Section 9.13  Current Ratio  The Borrower will not permit its ratio
     of (i) consolidated current assets to (ii) consolidated current liabilities
     (excluding current maturities of the Notes) to be less than 1.00 to 1.00 at
     the end of any fiscal quarter of the Borrower beginning September 30, 2001
     and thereafter."

     Section 2.04  Amendments to Schedules.  Schedule 9.03 is hereby amended by
replacing item 2 thereof with the following:

          "2.  Loans from the Borrower to ATP (UK) of not more than $6,000,000
     at any one time outstanding as of the Closing Date and for a period not to
     extend past August 31, 2001."

                                       2
<PAGE>

                            ARTICLE III.  CONDITIONS

     The enforceability of this Third Amendment against the Administrative Agent
and the Lenders is subject to the satisfaction of the following conditions
precedent:

     Section 3.01  Loan Documents.  The Administrative Agent shall have received
multiple original counterparts, as requested by the Administrative Agent, of
this Third Amendment executed and delivered by a duly authorized officer of the
Borrower, the Administrative Agent, and each Lender.

     Section 3.02  Corporate Proceedings of Loan Parties.  The Administrative
Agent shall have received multiple copies, as requested by the Administrative
Agent, of the resolutions, in form and substance reasonably satisfactory to the
Administrative Agent, of the Board of Directors of the Borrower, authorizing the
execution, delivery, and performance of this Third Amendment, each such copy
being attached to an original certificate of the Secretary or an Assistant
Secretary of the Borrower, dated as of the Effective Date, certifying (i) that
the resolutions attached thereto are true, correct and complete copies of
resolutions duly adopted by written consent or at a meeting of the Board of
Directors, (ii) that such resolutions constitute all resolutions adopted with
respect to the transactions contemplated hereby, (iii) that such resolutions
have not been amended, modified, revoked or rescinded as of the Effective Date,
(iv) that the articles of incorporation and bylaws of the Borrower have not been
amended or otherwise modified since the effective date of the Credit Agreement,
except pursuant to any amendments attached thereto, and (v) as to the incumbency
and signature of the officers of the Borrower executing this Third Amendment.

     Section 3.03  Representations and Warranties.  Except as affected by the
transactions contemplated in the Credit Agreement and this Third Amendment, each
of the representations and warranties made by the Borrower in or pursuant to the
Loan Documents shall be true and correct in all material respects as of the
Effective Date, as if made on and of such date.

     Section 3.04 No Default. No Default or Event of Default shall have occurred
and be continuing as of the Effective Date.

     Section 3.05  No Change.  No event shall have occurred since December 31,
2000, which, in the reasonably opinion of the Lenders, could have a Material
Adverse Effect.

     Section 3.06  Security Instruments.  All of the Security Instruments shall
be in full force and effect and provide to the Administrative Agent the security
intended thereby to secure the Indebtedness, as amended and supplemented hereby.

     Section 3.07  Other Instruments or Documents.  The Administrative Agent or
any Lender or counsel to the Administrative Agent shall receive such other
instruments or documents as they may reasonably request.

     Sectin 3.08  Amendment Fee.  The Borrower shall pay to the Administrative
Agent for the benefit of the Lenders an amendment fee of $75,000.

                                       3
<PAGE>

                           ARTICLE IV.  MISCELLANEOUS

     Section 4.01  Adoption, Ratification and Confirmation of Credit Agreement.
Each of the Borrower, the Administrative Agent, and the Lenders does hereby
adopt, ratify and confirm the Credit Agreement, as amended hereby and
acknowledges and agrees that the Credit Agreement, as amended hereby, is and
remains in full force and effect.

     Section 4.02  Successors and Assigns.  This Third Amendment shall be
binding upon and inure to the benefit of the parties hereto and their respective
successors and assigns permitted pursuant to the Credit Agreement.

     Section 4.03  Counterparts.  This Third Amendment may be executed by one or
more of the parties hereto in any number of separate counterparts, and all such
counterparts taken together shall be deemed to constitute one and the same
instrument and shall be enforceable as of the Effective Date upon the execution
of one or more counterparts hereof by the Borrower, the Administrative Agent and
the Lenders.  In this regard, each of the parties hereto acknowledges that a
counterpart of this Third Amendment containing a set of counterpart execution
pages reflecting the execution of each party hereto shall be sufficient to
reflect the execution of this Third Amendment by each necessary party hereto and
shall constitute one instrument.

     Section 4.04  Number and Gender.  Whenever the context requires, reference
herein made to the single number shall be understood to include the plural; and
likewise, the plural shall be understood to include the singular.  Words
denoting sex shall be construed to include the masculine, feminine and neuter,
when such construction is appropriate; and specific enumeration shall not
exclude the general but shall be construed as cumulative. Definitions of terms
defined in the singular or plural shall be equally applicable to the plural or
singular, as the case may be, unless otherwise indicated.

     Section 4.05  Entire Agreement.  This Third Amendment constitutes the
entire agreement among the parties hereto with respect to the subject hereof.
All prior understandings, statements and agreements, whether written or oral,
relating to the subject hereof are superseded by this Third Amendment.

     Section 4.06  Invalidity.  In the event that any one or more of the
provisions contained in this Third Amendment shall for any reason be held
invalid, illegal or unenforceable in any respect, such invalidity, illegality or
unenforceability shall not affect any other provision of this Third Amendment.

     Section 4.07  Titles of Articles, Sections and Subsections.  All titles or
headings to Articles, Sections, subsections or other divisions of this Third
Amendment or the exhibits hereto, if any, are only for the convenience of the
parties and shall not be construed to have any effect or meaning with respect to
the other content of such Articles, Sections, subsections, other divisions or
exhibits, such other content being controlling as the agreement among the
parties hereto.

     Section 4.08  Governing Law.  This Third Amendment shall be deemed to be a
contract made under and shall be governed by and construed in accordance with
the internal laws of the State of Texas.

     THIS THIRD AMENDMENT, THE CREDIT AGREEMENT, AS AMENDED HEREBY, THE NOTES,
     AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE
     PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS,
     OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES.

                                       4
<PAGE>

     THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

                        [SIGNATURES BEGIN ON NEXT PAGE]

                                       5
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Third Amendment to
be duly executed and delivered by their proper and duly authorized officers as
of the Effective Date.

BORROWER:  ATP OIL & GAS CORPORATION

                                    By:  /s/ T. Paul Bulmahn
                                         -------------------
                                    T. Paul Bulmahn
                                    President

                                       1
<PAGE>

LENDER AND ADMINISTRATIVE AGENT:    BNP PARIBAS, INDIVIDUALLY AND AS
                                      ADMINISTRATIVE AGENT

                                    By:    /s/ Brian M. Malone
                                           -------------------------
                                    Name:  Brian M. Malone
                                    Title: Managing Director

                                    By:    /s/ Betsy Jocher
                                           -------------------------
                                    Name:  Betsy Jocher
                                    Title: Vice President

LENDER AND SYNDICATION AGENT        UNION BANK OF CALIFORNIA
                                    N.A., INDIVIDUALLY AND AS SYNDICATION
                                    AGENT

                                    By:
                                           -------------------------
                                    Name:
                                           -------------------------
                                    Title:
                                           -------------------------

                                       2<PAGE>

                                                                   Exhibit 10.44
                                             [As amended through April 18, 2001]

                        CSG SYSTEMS INTERNATIONAL, INC.
                 STOCK OPTION PLAN FOR NON-EMPLOYEE DIRECTORS

     1.   Purpose.  The purpose of the CSG Systems International, Inc. Stock
Option Plan for Non-Employee Directors (the "Plan") is to foster and promote the
long-term financial success of the Company and thereby increase stockholder
value by attracting and retaining as directors of the Company highly qualified
persons who are not employees of the Company or a Subsidiary.

     2.   Certain Definitions.

     "Board" means the Board of Directors of the Company.

     "Code" means the Internal Revenue Code of 1986, as amended from time to
time, or any successor thereto.  References to a particular section of the Code
shall include any regulations issued under such section.

     "Common Stock" means the Common Stock, $0.01 par value per share, of the
Company.

     "Company" means CSG Systems International, Inc., a Delaware corporation.

     "Director" means a person then serving as a member of the Board of the
Company.

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

     "Fair Market Value" means, as determined by the Board, the last sale price
of the Common Stock as quoted on the Nasdaq National Market System on the
trading day for which the determination is being made, or, in the event that no
such sale takes place on such day, the average of the reported closing bid and
asked prices on such day, or, if the Common Stock of the Company is listed on a
national securities exchange, the last reported sale price on the principal
national securities exchange on which the Common Stock is listed or admitted to
trading on the trading day for which the determination is being made, or, if no
such reported sale takes place on such day, the average of the closing bid and
asked prices on such day on the principal national securities exchange on which
the Common Stock is listed or admitted to trading, or, if the Common Stock is
not quoted on such National Market System nor listed or admitted to trading on a
national securities exchange, the average of the closing bid and asked prices in
the over-the-counter market on the day for which the determination is being made
as reported through Nasdaq, or, if bid and asked prices for the Common Stock on
such day are not reported through Nasdaq, the average of the bid and asked
prices for such day as furnished by any New York Stock Exchange member firm
regularly making a market in the Common Stock selected for such purpose by the
Board, or, if none of the
<PAGE>

foregoing is applicable, then the fair market value of the Common Stock as
determined in good faith by the Board in its sole discretion.

     "Stock Option" means an option to purchase Common Stock granted pursuant to
the Plan.

     "Subsidiary" means a corporation, domestic or foreign, of which not less
than 50% of the voting shares are held by the Company or by a Subsidiary,
whether or not such corporation now exists or hereafter is organized or acquired
by the Company or by a Subsidiary.

     3.   Administration.  The Plan shall be administered by the Board, and the
Board shall have authority to grant Stock Options to eligible Directors from
time to time pursuant to the Plan.  Subject to the applicable provisions of the
Plan, the Board shall have authority to interpret the provisions of the Plan and
to decide all questions of fact arising in the application of such provisions;
to select the Directors to whom Stock Options shall be granted; to determine
when, whether, and in what amounts Stock Options shall be granted; to determine
the amount, terms, and conditions of each Stock Option; to determine the Fair
Market Value of the Common Stock from time to time; to authorize persons to
execute on behalf of the Company any agreement required to be entered into under
the Plan; to adopt, alter, and repeal such administrative rules, guidelines, and
practices governing the Plan as the Board from time to time shall deem
advisable; and to make all other determinations necessary or advisable for the
administration of the Plan. Unless otherwise expressly provided in the Plan, all
decisions and determinations made by the Board pursuant to the provisions of the
Plan shall be made in the sole discretion of the Board and shall be final and
binding on all persons, including but not limited to the Company, the Directors
to whom Stock Options are granted, the heirs and legal representatives of such
Directors, and the personal representatives and beneficiaries of the estates of
such Directors.

     4.   Common Stock Subject to the Plan.  The Company shall reserve and keep
available for issuance under the Plan four hundred fifty thousand (450,000)
shares of Common Stock, subject to adjustment pursuant to Section 17.  Such
shares may consist in whole or in part of authorized and unissued shares or
treasury shares or any combination thereof. Except as otherwise provided in the
Plan, any shares subject to a Stock Option which expires or terminates
unexercised as to such shares shall again be available for the grant of Stock
Options.

     5.   Eligibility to Receive Stock Options.  Stock Options may be granted
under the Plan only to Directors who are not employees of the Company or a
Subsidiary on the date of the grant.

     6.   Stock Options.  All Stock Options shall be nonqualified stock options
for purposes of the Code.  Stock Options shall be evidenced by agreements in
such form as the Board shall approve from time to time; such agreements shall
contain in substance the following terms and conditions and may contain such
additional terms and conditions, not inconsistent with the terms of the Plan, as
the Board shall deem appropriate:

          (a) Type of Option.  Each option agreement shall identify the Stock
     Option evidenced thereby as a nonqualified stock option for purposes of the
     Code.

                                       2
<PAGE>

          (b) Option Price.  Each option agreement shall set forth the number of
     shares of Common Stock covered by the stock option and the applicable
     option exercise price per share, which price shall not be less than the
     Fair Market Value of the Common Stock on the date the Stock Option is
     granted or less than the par value of the Common Stock.

          (c) Term.  Each option agreement shall state the period or periods of
     time during which the Stock Option may be exercised, in whole or in part,
     which shall be such period or periods of time as the Board may determine at
     the time the Stock Option is granted; provided, that no Stock Option shall
     be exercisable more than ten years after the date of its grant; and
     provided further, that each Stock Option shall become and remain
     exercisable as provided in the option agreement relating to such Stock
     Option.

          (d) Payment for Shares.  Each option agreement shall provide that the
     option exercise price per share may be paid to the Company either (i) in
     cash, (ii) in shares of the Common Stock which already are owned by the
     option grantee (and have been owned by the option grantee for more than six
     months prior to the Stock Option exercise date) and which are surrendered
     to the Company in good form for transfer, or (iii) in any combination of
     cash and such shares of the Common Stock, except to the extent that the
     Board may restrict payment in shares of the Common Stock.  When payment is
     made in shares of the Common Stock, the value of such shares for such
     purpose shall be their Fair Market Value on the Stock Option exercise date.

     7.   Cessation of Service as a Director.  Unless the applicable option
agreement provides otherwise, if the grantee of a Stock Option ceases to be a
Director for any reason other than retirement from the Board under the
circumstances described in Section 8 or death, then each outstanding but
unexercised Stock Option held by such grantee shall continue to be exercisable
only to the extent that it was exercisable at the time that such grantee ceased
to be a Director and only until the earlier of (i) ninety days after such
grantee ceased to be a Director or (ii) the expiration of the term of such Stock
Option; and to the extent not exercisable or not exercised (if exercisable) by
such applicable date, such Stock Option shall terminate and be of no further
force or effect.

     8.   Retirement from Board.  Unless the applicable option agreement
provides otherwise, if the grantee of a Stock Option ceases to be a Director
(other than by reason of death) and at the time of such occurrence (the
"Retirement Date") is at least age 65 with ten or more years of service as a
Director or is at least age 70 with five or more years of service as a Director,
then each outstanding but unexercised Stock Option held by such grantee on the
Retirement Date shall continue to be or become exercisable in accordance with
its terms until the earlier of (i) five years after the Retirement Date or (ii)
the expiration of the term of such Stock Option; and to the extent not
exercisable or not exercised (if exercisable) by such applicable date, such
Stock Option shall terminate and be of no further force or effect.

                                       3
<PAGE>

     9.   Death.  Unless the applicable option agreement provides otherwise, if
the grantee of a Stock Option dies, then each outstanding but unexercised Stock
Option which had been held by such grantee for at least twelve months as of the
date of such grantee's death automatically shall become exercisable in full (if
not already exercisable) upon such grantee's death.  Each outstanding but
unexercised Stock Option which becomes exercisable pursuant to the preceding
sentence and each outstanding but unexercised Stock Option held by such grantee
which was exercisable on the date of such grantee's death may be exercised by
the legal representative of such grantee's estate or by the beneficiaries of
such estate to whom such Stock Option is distributed until the earlier of (i)
three years after the date of such grantee's death or (ii) the expiration of the
term of such Stock Option; and to the extent not exercisable or not exercised
(if exercisable) by such applicable date, such Stock Option shall terminate and
be of no further force or effect.

     10.  Acceleration of Exercisability.  The Board shall have the authority to
accelerate the exercisability of any outstanding Stock Option, subject to any
applicable requirements of the Plan, under such circumstances and upon such
terms and conditions as the Board shall deem appropriate.

     11.  General Restrictions.  Each Stock Option grant under the Plan shall be
subject to the requirement that if at any time the Board shall determine that
(i) the listing, registration, or qualification of the shares of Common Stock
subject or related thereto upon any securities market or securities exchange or
under any state or federal law, (ii) the consent or approval of any governmental
regulatory body, or (iii) an agreement by the grantee of such Stock Option with
respect to the disposition of the shares of Common Stock subject thereto is
necessary or desirable as a condition of, or in connection with, such grant or
the issuance of shares of Common Stock thereunder, then such Stock Option grant
may not be consummated and any rights under such Stock Option may not be
exercised in whole or in part unless and until such listing, registration,
qualification, consent, approval, or agreement shall have been effected or
obtained upon conditions acceptable to the Board.

     12.  Rights of a Stockholder.  The grantee of a Stock Option shall have no
rights as a stockholder of the Company with respect to the shares of Common
Stock subject to such Stock Option unless and until certificates for such shares
of Common Stock are issued to such grantee upon the timely and proper exercise
of such Stock Option.

     13.  No Right to Continue as a Director.  Nothing in the Plan or in any
agreement entered into pursuant to the Plan shall confer upon any Director the
right to continue to serve as a Director of the Company.

     14.  Indemnification.  No member of the Board, and no officer or employee
of the Company acting on behalf of the Board, shall be personally liable for any
action, determination, or interpretation taken or made in good faith with
respect to the Plan; and all members of the Board and each officer or employee
of the Company acting on behalf of the Board shall, to the extent permitted by
law, be fully indemnified by the Company in respect of any such action,
determination, or interpretation.

                                       4
<PAGE>

     15.  Non-Assignability.  No Stock Option granted under the Plan shall be
assignable or transferable by the grantee thereof except by will, by the laws of
descent and distribution, or by such other means (if any) or in such other
manner (if any) as the Board may approve from time to time.  No right or benefit
under the Plan or any Stock Option granted under the Plan shall be liable for
the debts, liabilities, or alimony obligations of the person entitled to such
right or benefit, either by assignment, attachment, or any other method, and
shall not be subject to be taken by the creditors of the person entitled to such
right or benefit by any process whatsoever.

     16.  Nonuniform Determinations.  The Board's determinations under the Plan
(including but not limited to determinations of the persons to receive Stock
Option grants, the amount and timing of such grants, and the terms and
provisions of such grants) need not be uniform and may be made by the Board
selectively among the Directors who receive, or are eligible to receive, Stock
Option grants.

     17.  Adjustments.  In the event of any change in the outstanding shares of
Common Stock by reason of a stock dividend or distribution, stock split,
recapitalization, merger, reorganization, consolidation, split-up, spin-off,
combination of shares, exchange of shares, or other change in corporate
structure affecting the Common Stock, the Board shall make appropriate
adjustments in (a) the aggregate number of shares of Common Stock (i) reserved
for issuance under the Plan and (ii) covered by outstanding Stock Option grants
and (b) the exercise price related to outstanding Stock Options; provided, that
the number of shares subject to any Stock Option always shall be a whole number.

     18.  Termination and Amendment.  The Board may terminate the Plan or amend
the Plan or any portion thereof at any time, including but not limited to
amendments to the Plan necessary to comply with the requirements of Section
16(b) of the Exchange Act or applicable regulations thereunder, except that the
Board may not increase the maximum number of shares which may be issued under
the Plan (other than by way of adjustments made pursuant to Section 17), extend
the maximum period during which any Stock Option  may be exercised, extend the
term of the Plan, decrease the minimum option price to less than the Fair Market
Value on the date of the grant of a Stock Option, or change the category of
persons eligible to participate in the Plan without stockholder approval if such
approval is required by the applicable rules of the Securities and Exchange
Commission, the Nasdaq National Market, or any national securities exchange on
which the Common Stock is listed.  The termination or any amendment of the Plan
shall not, without the consent of a Stock Option grantee, adversely affect such
grantee's rights under a Stock Option previously granted to such grantee.  The
Board may amend the terms and conditions of any Stock Option grant previously
made, prospectively or retroactively, as long as such amendment is not
inconsistent with the terms of the Plan; but, except as otherwise expressly
permitted by the Plan and subject to Section 17, no such amendment shall
adversely affect the rights of the grantee of such Stock Option without such
grantee's consent.

     19.  Term of Plan.  Subject to approval of the Plan by the stockholders of
the Company not later than December 31, 1997, the Plan shall become effective on
the date on which the Plan is approved and adopted by the Board and shall
terminate for purposes of further Stock Option grants

                                       5
<PAGE>

on the first to occur of (i) December 31, 2006, or (ii) the effective date of
the termination of the Plan by the Board pursuant to Section 18. No Stock
Options may be granted under the Plan after the termination of the Plan, but
such termination shall not affect any Stock Options outstanding at the time of
such termination or the authority of the Board to continue to administer the
Plan apart from the making of further Stock Option grants. The Board may grant
Stock Options under the Plan prior to approval of the Plan by the stockholders
of the Company, but any Stock Options so granted shall be subject in all
respects to such approval. Notwithstanding the provisions of any option
agreement evidencing a Stock Option granted prior to approval of the Plan by the
stockholders of the Company, such Stock Option may not be exercised to any
extent prior to such stockholder approval. If such stockholder approval is not
given by December 31, 1997, then the Plan and all Stock Options granted
thereunder automatically shall terminate and be of no further force or effect at
the close of business on December 31, 1997.

     20.  Governing Law.  The Plan shall be governed by and construed in
accordance with the laws of Delaware.

                                       6

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