Document:

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                                                                   EXHIBIT 10.24

                              VIGNETTE CORPORATION
                          NOTICE OF STOCK OPTION GRANT

You have been granted the following option to purchase shares of the Common
Stock of Vignette Corporation (the "Corporation"):

    Name of Optionee:                  Jeanne Urich

    Total Number of Shares:            1,000,000

    Type of Option:                    Nonstatutory Stock Option

    Exercise Price Per Share:          $2.8200

    Date of Grant:                     February 22, 2002

    Vesting Commencement Date:         February 13, 2002

    Vesting                            Schedule: This option becomes exercisable
                                       in equal increments. The first 6.25% of
                                       the Shares subject to this option shall
                                       become exercisable when you complete
                                       three (3) months of Service from the
                                       Vesting Commencement Date. An additional
                                       6.25% of the Shares subject to this
                                       option shall become exercisable when you
                                       complete each quarter of Service
                                       thereafter.

    Expiration                         Date: 8 years from Grant Date; however,
                                       this option will expire earlier if your
                                       Service terminates earlier, as described
                                       in the Stock Option Agreement.

Nothing in this Notice or in the Stock Option Agreement shall confer upon you
any right to continue in Service for any period of specific duration or
interfere with or otherwise restrict in any way your rights or the rights of the
Corporation (or any parent or subsidiary employing or retaining you), which
rights are hereby expressly reserved by each, to terminate your Service at any
time for any reason, with or without cause.

You further agree that the Corporation may deliver by email all documents
relating this option (including, without limitation, prospectuses required by
the Securities and Exchange Commission) and all other documents that the
Corporation is required to deliver to its security holders (including, without
limitation, annual reports and proxy statements). You also agree that the
Corporation may deliver these documents by posting them on a web site maintained
by the Corporation or by a third party under contract with the Corporation. If
the Corporation posts these documents on a web site, it will notify you by
email.

By accepting this option, you and the Corporation agree that this option is
granted under and governed by the terms and conditions of the Stock Option
Agreement, which is attached to and made a part of this document.

OPTIONEE:                              VIGNETTE CORPORATION

                                       By:
---------------------------------         -----------------------------------

                                       Title:
                                             --------------------------------

<PAGE>

                              VIGNETTE CORPORATION
                             STOCK OPTION AGREEMENT

Tax Treatment       This option is intended to be an incentive stock option
                    under section 422 of the Internal Revenue Code or a
                    nonstatutory stock option, as provided in the Notice of
                    Stock Option Grant.

Vesting             This option becomes exercisable in installments, as shown in
                    the Notice of Stock Option Grant. No additional shares
                    become exercisable after your service as an employee,
                    consultant or outside director of the Corporation or a
                    parent or subsidiary of the Corporation ("Service") has
                    terminated for any reason. In addition, this option becomes
                    exercisable in full if your Service terminates because of
                    death.

                    This option will in no event become exercisable for
                    additional shares after your service as an employee,
                    consultant or outside director of the Corporation or a
                    parent or subsidiary of the Corporation ("Service") has
                    terminated for any reason. It is intended that the exercise
                    schedule for this option is commensurate with a full-time
                    work schedule. For possible adjustments that may be made by
                    the Corporation, see the Section below entitled "Leaves of
                    Absence and Part-Time Work."

Change in Control   In the event of a Change in Control, then the vesting of
                    this option will automatically accelerate so that this
                    option will immediately before the effective date of the
                    Change in Control, become fully exercisable for all of the
                    shares of Common Stock at the time subject to this option
                    and may be exercised for any or all of those shares as
                    fully-vested shares of Common Stock. However, this option
                    will not so accelerate if and to the extent this option is,
                    in connection with the Change in Control, either to be
                    assumed by the successor corporation (or its parent) or to
                    be replaced with a comparable option for shares of the
                    capital stock of the successor corporation (or its parent).
                    The determination of option comparability will be made by
                    the Corporation's Board of Directors, and its determination
                    will be final, binding and conclusive.

                    Change in Control is defined in the Corporation's 1999
                    Equity Incentive Plan.

                                       2

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Involuntary         If the option is assumed by the successor corporation (or
Termination         its parent) and you experience an Involuntary Termination
                    within eighteen months following a Change in Control, the
                    vesting of this option will automatically accelerate so that
                    this option will, immediately before the effective date of
                    the Involuntary Termination, become fully exercisable for
                    all of the shares of Common Stock at the time subject to
                    this option and may be exercised for any or all of those
                    shares as fully-vested shares of Common Stock.

                    An Involuntary Termination means the termination of your
                    Service by reason of: your involuntary dismissal or
                    discharge by the Corporation for reasons other than
                    Misconduct (as defined below), neglect of duties, any breach
                    of an agreement between you and the Corporation or of any
                    Corporation policy, or any act or omission involving moral
                    turpitude, or (b) your voluntary resignation following (1) a
                    change in your position with the Corporation which
                    materially reduces your level of responsibility, (2) a
                    reduction in your level of compensation (including base
                    salary, fringe benefits and participation in bonus or
                    incentive programs) by more than 15% or (3) a relocation of
                    your place of employment by more than fifty (50) miles,
                    provided and only if such change, reduction or relocation is
                    effected by the Corporation without your consent.

Term                This option expires in any event at the close of business at
                    Corporation headquarters on the day before the 8th
                    anniversary of the Date of Grant, as shown in the Notice of
                    Stock Option Grant. (It may expire earlier if your Service
                    terminates, as described above.)

Regular             If your Service terminates for any reason except death,
Termination         Misconduct, Permanent Disability or a termination by the
                    Corporation without Cause, then this option will expire at
                    the close of business at Corporation headquarters on the
                    date three (3) months after your termination date. If your
                    Service is terminated by the Corporation without Cause, then
                    this option will expire at the close of business at
                    Corporation headquarters on the date six (6) months after
                    your termination date. The Corporation determines when your
                    Service terminates for this purpose.

                    However, the six (6) month time period provided for
                    exercising your vested options will not apply unless you
                    sign a general release of claims (in a form prescribed by
                    the Corporation) of all known and unknown claims that you
                    may then have against the Corporation or persons affiliated
                    with the Corporation. The benefit of the extension of this
                    option, together with the severance benefits provided in
                    your offer letter dated January 18, 2002 shall be the only
                    consideration for such a release. For purposes of this
                    provision, "Cause" means misconduct, neglect of duties, any
                    breach of an agreement between you and the Corporation, or
                    any act or omission involving moral turpitude.

                                       3

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Death               If you die while this option is outstanding, then this
                    option will expire at the close of business at Corporation
                    headquarters on the date 12 months after the date of death.

Disability          If your Service terminates because of your Permanent
                    Disability, then this option will expire at the close of
                    business at Corporation headquarters on the date 12 months
                    after your termination date.

                    For all purposes under this Agreement, "Permanent
                    Disability" means that you are unable to engage in any
                    substantial gainful activity by reason of any medically
                    determinable physical or mental impairment which can be
                    expected to result in death or which has lasted, or can be
                    expected to last, for a continuous period of not less than
                    one year.

Leaves of Absence   For purposes of this option, your Service does not terminate
and Part-Time       when you go on a military leave, a sick leave or another
Work                bona fide leave of absence, if the leave was approved by the
                    Corporation in writing. Your Service terminates when the
                    approved leave ends, unless you immediately return to active
                    work.

                    If you go on a leave of absence that lasts or is expected to
                    last seven days or longer, then this option shall not become
                    exercisable for any additional shares and vesting will be
                    suspended during the leave to the extent provided for in the
                    Corporation's leave policy. Upon your return to active work,
                    vesting will resume; however, unless otherwise provided in
                    the Corporation's leave policy, you will not receive credit
                    for any vesting during the period of your leave.

                    If you and the Corporation agree to a reduction in your
                    scheduled work hours, then the Corporation reserves the
                    right to modify the rate at which this option becomes
                    exercisable or vests, so that the rate of vesting is
                    commensurate with your reduced work schedule. Any such
                    adjustment shall be consistent with the Corporation's
                    policies for part-time or reduced work schedules or shall be
                    pursuant to the terms of an agreement between you and the
                    Corporation pertaining to your reduced work schedule.

                    The Corporation shall not be required to adjust the exercise
                    or vesting schedule of any option pursuant to this
                    subsection.

Misconduct          If your Service terminates for Misconduct, then this option
                    will terminate immediately and cease to be outstanding.
                    "Misconduct" includes fraud, embezzlement, dishonesty or any
                    unauthorized use or disclosure of confidential information
                    or trade secrets of the Corporation or any parent or
                    subsidiary or any other intentional misconduct adversely
                    affecting the business or affairs of the Corporation or a
                    parent or subsidiary of the Corporation.

                                       4

<PAGE>

Restrictions on     The Corporation will not permit you to exercise this option
Exercise            if the issuance of shares at that time would violate any
                    law, regulation or corporate policy.

Notice of Exercise  When you wish to exercise this option, you must notify the
                    Corporation by filing the proper "Notice of Exercise" form
                    at the address given on the form. Your notice must specify
                    how many shares you wish to purchase. Your notice must also
                    specify how your shares should be registered. The notice
                    will be effective when the Corporation receives it.

                    If someone else wants to exercise this option after your
                    death, that person must prove to the Corporation's
                    satisfaction that he or she is entitled to do so.
                    Furthermore, in no event shall the Corporation's request for
                    satisfactory documentation in connection with an option
                    exercise extend the option's expiration date beyond the time
                    period specified in the above section entitled "Death."

Form of Payment     When you submit your notice of exercise, you must include
                    payment of the option exercise price for the shares that you
                    are purchasing. To the extent permitted by applicable law,
                    payment may be made in one (or a combination of two or more)
                    of the following forms:

                    o    Your personal check, a cashier's check or a money
                         order.

                    o    Certificates for shares of Corporation stock that you
                         own, along with any forms needed to effect a transfer
                         of those shares to the Corporation. The value of the
                         shares, determined as of the effective date of the
                         option exercise, will be applied to the option exercise
                         price. Instead of surrendering shares of Corporation
                         stock, you may attest to the ownership of those shares
                         on a form provided by the Corporation and have the same
                         number of shares subtracted from the option shares
                         issued to you. However, you may not surrender, or
                         attest to the ownership of, shares of Corporation stock
                         in payment of the exercise price if your action would
                         cause the Corporation to recognize compensation expense
                         (or additional compensation expense) with respect to
                         this option for financial reporting purposes.

                    o    Irrevocable directions to a securities broker approved
                         by the Corporation to sell all or part of your option
                         shares and to deliver to the Corporation from the sale
                         proceeds an amount sufficient to pay the option
                         exercise price and any withholding taxes. (The balance
                         of the sale proceeds, if any, will be delivered to
                         you.) The directions must be given by signing a special
                         "Notice of Exercise" form provided by the Corporation.
                         However, payment pursuant to this procedure shall not
                         be permitted if such payment would violate applicable
                         law or a policy of the Corporation.

                                       5

<PAGE>

                    o    Irrevocable directions to a securities broker or lender
                         approved by the Corporation to pledge option shares as
                         security for a loan and to deliver to the Corporation
                         from the loan proceeds an amount sufficient to pay the
                         option exercise price and any withholding taxes. The
                         directions must be given by signing a special "Notice
                         of Exercise" form provided by the Corporation. However,
                         payment pursuant to this procedure shall not be
                         permitted if such payment would violate applicable law
                         or a policy of the Corporation.

Withholding         You will not be allowed to exercise this option unless you
Taxes and Stock     make arrangements acceptable to the Corporation to pay any
Withholding         withholding taxes that may be due as a result of the option
                    exercise. With the Corporation's consent, these arrangements
                    may include withholding shares of Corporation stock that
                    otherwise would be issued to you when you exercise this
                    option. The value of these shares, determined as of the
                    effective date of the option exercise, will be applied to
                    the withholding taxes.

Restrictions on     You agree not to sell any option shares at a time when
Resale              applicable laws, regulations, Corporation trading policies
                    (including the Corporation's Insider Trading Policy, a copy
                    of which can be found on the Corporation's intranet) or an
                    agreement between the Corporation and its underwriters
                    prohibit a sale. This restriction will apply as long as your
                    Service continues and for such period of time after the
                    termination of your Service as the Corporation may specify.

Transfer of         In general, only you may exercise this option prior to your
Option              death. You may not transfer or assign this option, except as
                    provided below. For instance, you may not sell this option
                    or use it as security for a loan. If you attempt to do any
                    of these things, this option will immediately become
                    invalid. You may, however, dispose of this option in your
                    will or in a beneficiary designation.

                    Regardless of any marital property settlement agreement, the
                    Corporation is not obligated to honor a notice of exercise
                    from your former spouse, nor is the Corporation obligated to
                    recognize your former spouse's interest in your option in
                    any other way.

                    If another person wants to exercise this option after it has
                    been transferred to him or her, including a transfer upon
                    your death, that person must prove to the Corporation's
                    satisfaction that he or she is entitled to exercise this
                    option. That person must also complete the proper "Notice of
                    Exercise" form (as described above) and pay the exercise
                    price (as described below).

Retention Rights    Your option or this Agreement does not give you the right to
                    be retained by the Corporation or a subsidiary of the
                    Corporation in any capacity. The Corporation and its
                    subsidiaries reserve the right to terminate your Service at
                    any time, with or without cause.

                                       6

<PAGE>

Stockholder         You, or your estate or heirs, have no rights as a
Rights              stockholder of the Corporation until you have exercised this
                    option by giving the required notice to the Corporation and
                    paying the exercise price. No adjustments are made for
                    dividends or other rights if the applicable record date
                    occurs before you exercise this option.

Adjustments         In the event of a stock split, a stock dividend or a similar
                    change in Common Stock, the number of shares covered by this
                    option and the exercise price per share may be adjusted
                    pursuant to the terms and conditions specified in Section
                    11.1 of the Corporation's 1999 Equity Incentive Plan.

Applicable          Law This Agreement will be interpreted and enforced with
                    respect to issues of contract law under the laws of the
                    State of Texas and with respect to issues of corporation law
                    under the laws of the State of Delaware.

Other               Agreements This Agreement constitutes the entire
                    understanding between you and the Corporation regarding this
                    option. Any prior agreements, commitments or negotiations
                    concerning this option are superseded. This Agreement may be
                    amended only by another written agreement, signed by both
                    parties.

   BY SIGNING THE COVER SHEET OF THIS AGREEMENT, YOU AGREE TO ALL OF THE TERMS
                        AND CONDITIONS DESCRIBED ABOVE.

                                       7<PAGE>

                                                                   EXHIBIT 10.25

                              VIGNETTE CORPORATION
                          NOTICE OF STOCK OPTION GRANT

You have been granted the following option to purchase shares of the Common
Stock of Vignette Corporation (the "Corporation"):

    Name of Optionee:                   Thomas E. Hogan

    Total Number of Shares:             862,500

    Type of Option:                     Nonstatutory Stock Option

    Exercise Price Per Share:           $3.8800

    Date of Grant:                      April 6, 2001

    Vesting Commencement Date:          April 6, 2001

    Vesting                             Schedule: This option becomes
                                        exercisable in equal increments over
                                        twelve months. The first 25% of the
                                        Shares subject to this option shall
                                        become exercisable when you complete
                                        three (3) months of Service from the
                                        Vesting Commencement Date. An additional
                                        25% of the Shares subject to this option
                                        shall become exercisable when you
                                        complete each quarter of Service
                                        thereafter.

    Expiration                          Date: 8 years from Grant Date; however,
                                        this option will expire earlier if your
                                        Service terminates earlier, as described
                                        in the Stock Option Agreement.

Nothing in this Notice or in the Stock Option Agreement shall confer upon you
any right to continue in Service for any period of specific duration or
interfere with or otherwise restrict in any way your rights or the rights of the
Corporation (or any parent or subsidiary employing or retaining you), which
rights are hereby expressly reserved by each, to terminate your Service at any
time for any reason, with or without cause.

You further agree that the Corporation may deliver by email all documents
relating this option (including, without limitation, prospectuses required by
the Securities and Exchange Commission) and all other documents that the
Corporation is required to deliver to its security holders (including, without
limitation, annual reports and proxy statements). You also agree that the
Corporation may deliver these documents by posting them on a web site maintained
by the Corporation or by a third party under contract with the Corporation. If
the Corporation posts these documents on a web site, it will notify you by
email.

By accepting this option, you and the Corporation agree that this option is
granted under and governed by the terms and conditions of the Stock Option
Agreement, which is attached to and made a part of this document.

OPTIONEE:                               VIGNETTE CORPORATION

                                        By:
-----------------------------------        -----------------------------------

                                        Title:
                                              --------------------------------

<PAGE>

                              VIGNETTE CORPORATION
                             STOCK OPTION AGREEMENT

Tax Treatment       This option is intended to be an incentive stock option
                    under section 422 of the Internal Revenue Code or a
                    nonstatutory stock option, as provided in the Notice of
                    Stock Option Grant.

Vesting             This option becomes exercisable in installments, as shown in
                    the Notice of Stock Option Grant. No additional shares
                    become exercisable after your service as an employee,
                    consultant or outside director of the Corporation or a
                    parent or subsidiary of the Corporation ("Service") has
                    terminated for any reason. In addition, this option becomes
                    exercisable in full if any of the following events occurs:

                    o    Your Service terminates because of death, or

                    o    If the Corporation terminates your Service for any
                         reason other than for Cause, or if you Resign with Good
                         Reason, then vesting of this option shall immediately
                         accelerate as if your Service had continued for one
                         additional year. In no event shall acceleration exceed
                         25% of the then unvested shares. For purposes of this
                         Agreement, Resign with Good Reason shall mean your
                         resignation following 1.) a change in your position
                         which materially reduces your level of responsibility;
                         2.) a material reduction in your level of compensation;
                         or 3.) a relocation of your place of employment by more
                         than 50 miles without your consent. For purposes of
                         this provision, "Cause" means misconduct, neglect of
                         duties, any breach of the Corporation's Proprietary
                         Information and Inventions Agreement, or any act or
                         omission involving moral turpitude.

                    o    If the Corporation appoints a new Chief Executive
                         Officer (CEO) and you are not offered the position, and
                         as a result you resign within 90 days from the
                         appointment of a new CEO, then vesting of this option
                         shall accelerate as if your Service had continued for
                         one additional year.

                    o    However, the acceleration provided for in the preceding
                         two bullets will not apply unless you sign a general
                         release of claims (in a form prescribed by the
                         Corporation) of all known and unknown claims that you
                         may then have against the Corporation or persons
                         affiliated with the Corporation.

                                       2

<PAGE>

Change in Control   In the event of a Change in Control, then the vesting of
                    this option will automatically accelerate so that this
                    option will immediately before the effective date of the
                    Change in Control, become fully exercisable for all of the
                    shares of Common Stock at the time subject to this option
                    and may be exercised for any or all of those shares as
                    fully-vested shares of Common Stock. However, this option
                    will not so accelerate if and to the extent this option is,
                    in connection with the Change in Control, either to be
                    assumed by the successor corporation (or its parent) or to
                    be replaced with a comparable option for shares of the
                    capital stock of the successor corporation (or its parent).
                    The determination of option comparability will be made by
                    the Corporation's Board of Directors, and its determination
                    will be final, binding and conclusive.

                    Change in Control is defined in the Corporation's 1999
                    Equity Incentive Plan.

Involuntary         If the option is assumed by the successor corporation (or
Termination         its parent) and you experience an Involuntary Termination
                    within eighteen months following a Change in Control, the
                    vesting of this option will automatically accelerate so that
                    this option will, immediately before the effective date of
                    the Involuntary Termination, become fully exercisable for
                    all of the shares of Common Stock at the time subject to
                    this option and may be exercised for any or all of those
                    shares as fully-vested shares of Common Stock.

                    An Involuntary Termination means the termination of your
                    Service by reason of: (a) your involuntary dismissal or
                    discharge by the Corporation for reasons other than
                    Misconduct (as defined below), or (b) your voluntary
                    resignation following (1) a change in your position with the
                    Corporation which materially reduces your level of
                    responsibility, (2) a reduction in your level of
                    compensation (including base salary, fringe benefits and
                    participation in bonus or incentive programs) or (3) a
                    relocation of your place of employment by more than fifty
                    (50) miles, provided and only if such change, reduction or
                    relocation is effected by the Corporation without your
                    consent. The foregoing shall include any resignation for
                    reasons outlined above in numbers 1-3 in the definition of
                    Resign with Good Reason.

Term                This option expires in any event at the close of business at
                    Corporation headquarters on the day before the 8th
                    anniversary of the Date of Grant, as shown in the Notice of
                    Stock Option Grant. (It may expire earlier if your Service
                    terminates, as described above.)

Regular             If your Service terminates for any reason except death,
Termination         Misconduct or Permanent Disability, then this option will
                    expire at the close of business at Corporation headquarters
                    on the date three (3) months after your termination date.
                    The Corporation determines when your Service terminates for
                    this purpose.

                                       3

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Death               If you die while this option is outstanding, then this
                    option will expire at the close of business at Corporation
                    headquarters on the date 12 months after the date of death.

Disability          If your Service terminates because of your Permanent
                    Disability, then this option will expire at the close of
                    business at Corporation headquarters on the date 12 months
                    after your termination date.

                    For all purposes under this Agreement, "Permanent
                    Disability" means that you are unable to engage in any
                    substantial gainful activity by reason of any medically
                    determinable physical or mental impairment which can be
                    expected to result in death or which has lasted, or can be
                    expected to last, for a continuous period of not less than
                    one year.

Leaves of Absence   For purposes of this option, your Service does not terminate
and Part-Time       when you go on a military leave, a sick leave or another
Work                bona fide leave of absence, if the leave was approved by the
                    Corporation in writing. Your Service terminates when the
                    approved leave ends, unless you immediately return to active
                    work.

                    If you go on a leave of absence that lasts or is expected to
                    last seven days or longer, then this option shall not become
                    exercisable for any additional shares and vesting will be
                    suspended during the leave to the extent provided for in the
                    Corporation's leave policy. Upon your return to active work,
                    vesting will resume; however, unless otherwise provided in
                    the Corporation's leave policy, you will not receive credit
                    for any vesting during the period of your leave.

                    If you and the Corporation agree to a reduction in your
                    scheduled work hours, then the Corporation reserves the
                    right to modify the rate at which this option becomes
                    exercisable or vests, so that the rate of vesting is
                    commensurate with your reduced work schedule. Any such
                    adjustment shall be consistent with the Corporation's
                    policies for part-time or reduced work schedules or shall be
                    pursuant to the terms of an agreement between you and the
                    Corporation pertaining to your reduced work schedule.

                    The Corporation shall not be required to adjust the exercise
                    or vesting schedule of any option pursuant to this
                    subsection.

Misconduct          If your Service terminates for Misconduct, then this option
                    will terminate immediately and cease to be outstanding.
                    "Misconduct" includes fraud, embezzlement, dishonesty or any
                    unauthorized use or disclosure of confidential information
                    or trade secrets of the Corporation or any parent or
                    subsidiary or any other intentional misconduct adversely
                    affecting the business or affairs of the Corporation or a
                    parent or subsidiary of the Corporation.

                                       4

<PAGE>

Restrictions on     The Corporation will not permit you to exercise this option
Exercise            if the issuance of shares at that time would violate any
                    law, regulation or corporate policy.

Notice of Exercise  When you wish to exercise this option, you must notify the
                    Corporation by filing the proper "Notice of Exercise" form
                    at the address given on the form. Your notice must specify
                    how many shares you wish to purchase. Your notice must also
                    specify how your shares should be registered. The notice
                    will be effective when the Corporation receives it.

                    If someone else wants to exercise this option after your
                    death, that person must prove to the Corporation's
                    satisfaction that he or she is entitled to do so.
                    Furthermore, in no event shall the Corporation's request for
                    satisfactory documentation in connection with an option
                    exercise extend the option's expiration date beyond the time
                    period specified in the above section entitled "Death."

Form of Payment     When you submit your notice of exercise, you must include
                    payment of the option exercise price for the shares that you
                    are purchasing. To the extent permitted by applicable law,
                    payment may be made in one (or a combination of two or more)
                    of the following forms:

                    o    Your personal check, a cashier's check or a money
                         order.

                    o    Certificates for shares of Corporation stock that you
                         own, along with any forms needed to effect a transfer
                         of those shares to the Corporation. The value of the
                         shares, determined as of the effective date of the
                         option exercise, will be applied to the option exercise
                         price. Instead of surrendering shares of Corporation
                         stock, you may attest to the ownership of those shares
                         on a form provided by the Corporation and have the same
                         number of shares subtracted from the option shares
                         issued to you. However, you may not surrender, or
                         attest to the ownership of, shares of Corporation stock
                         in payment of the exercise price if your action would
                         cause the Corporation to recognize compensation expense
                         (or additional compensation expense) with respect to
                         this option for financial reporting purposes.

                    o    Irrevocable directions to a securities broker approved
                         by the Corporation to sell all or part of your option
                         shares and to deliver to the Corporation from the sale
                         proceeds an amount sufficient to pay the option
                         exercise price and any withholding taxes. (The balance
                         of the sale proceeds, if any, will be delivered to
                         you.) The directions must be given by signing a special
                         "Notice of Exercise" form provided by the Corporation.
                         However, payment pursuant to this procedure shall not
                         be permitted if such payment would violate applicable
                         law or a policy of the Corporation.

                                       5

<PAGE>

                    o    Irrevocable directions to a securities broker or lender
                         approved by the Corporation to pledge option shares as
                         security for a loan and to deliver to the Corporation
                         from the loan proceeds an amount sufficient to pay the
                         option exercise price and any withholding taxes. The
                         directions must be given by signing a special "Notice
                         of Exercise" form provided by the Corporation. However,
                         payment pursuant to this procedure shall not be
                         permitted if such payment would violate applicable law
                         or a policy of the Corporation.

Withholding Taxes   You will not be allowed to exercise this option unless you
and Stock           make arrangements acceptable to the Corporation to pay any
Withholding         withholding taxes that may be due as a
                    result of the option exercise. With the Corporation's
                    consent, these arrangements may include withholding shares
                    of Corporation stock that otherwise would be issued to you
                    when you exercise this option. The value of these shares,
                    determined as of the effective date of the option exercise,
                    will be applied to the withholding taxes.

Restrictions on     You agree not to sell any option shares at a time when
Resale              applicable laws, regulations, Corporation trading policies
                    (including the Corporation's Insider Trading Policy, a copy
                    of which can be found on the Corporation's intranet) or an
                    agreement between the Corporation and its underwriters
                    prohibit a sale. This restriction will apply as long as your
                    Service continues and for such period of time after the
                    termination of your Service as the Corporation may specify.

Transfer of         In general, only you may exercise this option prior to your
Option              death. You may not transfer or assign this option, except as
                    provided below. For instance, you may not sell this option
                    or use it as security for a loan. If you attempt to do any
                    of these things, this option will immediately become
                    invalid. You may, however, dispose of this option in your
                    will or in a beneficiary designation.

                    Regardless of any marital property settlement agreement, the
                    Corporation is not obligated to honor a notice of exercise
                    from your former spouse, nor is the Corporation obligated to
                    recognize your former spouse's interest in your option in
                    any other way.

                    If another person wants to exercise this option after it has
                    been transferred to him or her, including a transfer upon
                    your death, that person must prove to the Corporation's
                    satisfaction that he or she is entitled to exercise this
                    option. That person must also complete the proper "Notice of
                    Exercise" form (as described above) and pay the exercise
                    price (as described below).

Retention Rights    Your option or this Agreement does not give you the right to
                    be retained by the Corporation or a subsidiary of the
                    Corporation in any capacity. The Corporation and its
                    subsidiaries reserve the right to terminate your Service at
                    any time, with or without cause.

                                       6

<PAGE>

Stockholder         You, or your estate or heirs, have no rights as a
Rights              stockholder of the Corporation until you have exercised this
                    option by giving the required notice to the Corporation and
                    paying the exercise price. No adjustments are made for
                    dividends or other rights if the applicable record date
                    occurs before you exercise this option.

Adjustments         In the event of a stock split, a stock dividend or a similar
                    change in Common Stock, the number of shares covered by this
                    option and the exercise price per share may be adjusted
                    pursuant to the terms and conditions specified in Section
                    11.1 of the Corporation's 1999 Equity Incentive Plan.

Applicable Law      This Agreement will be interpreted and enforced with respect
                    to issues of contract law under the laws of the State of
                    Texas and with respect to issues of corporation law under
                    the laws of the State of Delaware.

Other Agreements    This Agreement constitutes the entire understanding between
                    you and the Corporation regarding this option. Any prior
                    agreements, commitments or negotiations concerning this
                    option are superseded. This Agreement may be amended only by
                    another written agreement, signed by both parties.

   BY SIGNING THE COVER SHEET OF THIS AGREEMENT, YOU AGREE TO ALL OF THE TERMS
                        AND CONDITIONS DESCRIBED ABOVE.

                                       7

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