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                                                                       10-K 1999
                                                                   Exhibit 10(b)

                      SCHLUMBERGER 1994 STOCK OPTION PLAN
                  (As Established Effective January 26, 1994)

                               Second Amendment

   Schlumberger Limited, a Netherlands Antilles corporation, having heretofore
adopted the Schlumberger 1994 Stock Option Plan, effective January 26, 1994, as
amended, and having reserved the right under Section 12 thereof to amend the
Plan, does hereby amend the Plan, effective April 21, 1999, to read as follows:

   1. Section 2(d) of the Plan is hereby amended in its entirety to read as
      follows:

     "(d) If the exercise period of an outstanding Stock Option is continued
following a holder's termination of employment as provided in Section 5, and the
holder engages in 'detrimental activity' as described in Section 5, the
Committee shall have the authority in its discretion to cause such option to be
forfeited and certain option exercises thereunder to be rescinded as provided
for in Section 5."

   2. The Plan is hereby amended to add the following Section 5(c)(iv)(D):

     "(D) Notwithstanding the foregoing, if the optionee engages in `detrimental
activity' (as hereinafter defined) within one year following termination of
employment for any reason other than retirement, the Committee, in its
discretion, may cause the optionee's right to exercise such option to be
forfeited.  Such forfeiture may occur at any time after the Committee determines
that the optionee has engaged in detrimental activity and prior to the actual
delivery of all shares subject to the option pursuant to the exercise of such
option.  If an allegation of detrimental activity by an optionee is made to the
Committee, the Committee, in its discretion, may suspend the exercisability of
the optionee's options for up to two months to permit the investigation of such
allegation.  In addition, if the optionee engages in detrimental activity within
one year following termination of employment for any reason other than
retirement, the Committee, in its discretion, may rescind any option exercise
made within the period commencing six months preceding the date of the
optionee's termination of employment and ending three months following such
termination.  For purposes of this Section 5, 'detrimental activity' means
activity that is determined by the Committee in its sole and absolute discretion
to be detrimental to the interests of the Company or any of its subsidiaries,
including but not limited to situations where such optionee: (1) divulges trade
secrets of the Company, proprietary data or other confidential information
relating to the Company or to the business of the Company and any subsidiaries,
(2) enters into employment with a competitor under circumstances suggesting that
such optionee will be using unique or special knowledge gained as a Company
employee to compete with the Company, (3) uses information obtained during the
course of his or her prior employment for his or her own purposes, such as for
the solicitation of business, (4) is determined to have engaged (whether or not
prior to termination) in either gross misconduct or criminal activity harmful to
the Company, or (5) takes any action that harms the business interests,
reputation, or goodwill of the Company and/or its subsidiaries."

   3. Section 5(c)(v)(C) is hereby amended in its entirety to read as follows:

     "(D) Notwithstanding the foregoing, if the optionee engages in `detrimental
activity' (as defined in Section 5(c)(iv)(D)) within five years after
termination of employment by reason of retirement, the Committee, in its
discretion, may cause the optionee's right to exercise such option to be
forfeited.  Such forfeiture may occur at any time after the Committee determines
that the optionee has engaged in detrimental activity and prior to the actual
delivery of all shares subject to the option pursuant to the exercise of such
option.  If an allegation of detrimental activity by an optionee is made to the
Committee, the Committee, in its discretion, may suspend the exercisability of
the optionee's options for up to two months to permit the investigation of such
allegation.  In addition, if the optionee engages in detrimental activity within
five years following termination of employment by reason of retirement, the
Committee, in its discretion, may rescind any option exercise made within the
period commencing six months preceding the date of the optionee's termination of
employment by retirement and ending one year following such termination."

                                      61<PAGE>

                                                                       10-K 1999
                                                                   Exhibit 10(c)

                      SCHLUMBERGER 1994 STOCK OPTION PLAN
                  (As Established Effective January 26, 1994)

                                Third Amendment

          Schlumberger Limited, a Netherlands Antilles corporation, having
heretofore adopted the Schlumberger 1994 Stock Option Plan, effective January
26, 1994, as amended, and having reserved the right under Section 12 thereof to
amend the Plan, does hereby amend Section 3(c) of the Plan in its entirety,
effective July 13, 1999, to read as follows:

          "(c) For purposes of this Plan, employment with the Company shall
     include employment with any subsidiary of the Company, and Stock Options
     granted under this Plan shall not be affected by an employee's transfer of
     employment from the Company to a subsidiary, from a subsidiary to the
     Company or between subsidiaries.  The foregoing notwithstanding, with
     respect to an employee whose employment is transferred directly and without
     interruption to a corporation, limited liability company or other entity
     (an "M-I Company") pursuant to and in accordance with the terms of that
     certain Amended and Restated Organization Agreement and other agreements in
     connection therewith by and among Smith International, Inc., Schlumberger,
     et al., dated as of July 13, 1999, such employee's employment with the
     Company shall include employment with an M-I Company for purposes of
     exercising such employee's outstanding Stock Options as of the transfer
     date, and any such Stock Option shall not be affected by such employee's
     subsequent transfer of employment directly and without interruption from an
     M-I Company to the Company or any of its subsidiaries, from the Company or
     any of its subsidiaries to an M-I Company or between M-I Companies."

                                      62<PAGE>

                                                                       10-K 1999
                                                                   Exhibit 10(f)

                    SCHLUMBERGER 1989 STOCK INCENTIVE PLAN
                  (As Established Effective January 26, 1989)

                                Third Amendment

          Schlumberger Limited, a Netherlands Antilles corporation, having
heretofore adopted the Schlumberger 1989 Stock Incentive Plan, effective January
26, 1989, as amended, and having reserved the right under Section 15 thereof to
amend the Plan, does hereby amend Section 3(d) of the Plan in its entirety,
effective July 13, 1999, to read as follows:

          "(d) For purposes of this Plan, employment with the Company shall
     include employment with any subsidiary of the Company, and Stock Incentives
     granted under this Plan shall not be affected by an employee's transfer of
     employment from the Company to a subsidiary, from a subsidiary to the
     Company or between subsidiaries.  The foregoing notwithstanding, with
     respect to an employee whose employment is transferred directly and without
     interruption to a corporation, limited liability company or other entity
     (an "M-I Company") pursuant to and in accordance with the terms of that
     certain Amended and Restated Organization Agreement and other agreements
     entered into in connection therewith by and among Smith International,
     Inc., Schlumberger, et al., dated as of July 13, 1999, such employee's
     employment with the Company shall include employment with an M-I Company
     for purposes of exercising such employee's outstanding Stock Incentives as
     of the transfer date, and any such Stock Incentive shall not be affected by
     such employee's subsequent transfer of employment directly and without
     interruption from an M-I Company to the Company or any of its subsidiaries,
     from the Company or any of its subsidiaries to an M-I Company or between M-
     I Companies."

                                      63<PAGE>

                                                                       10-K 1999
                                                                   Exhibit 10(i)

                      SCHLUMBERGER 1998 STOCK OPTION PLAN
                  (As Established Effective January 21, 1998)

                                First Amendment

   Schlumberger Limited, a Netherlands Antilles corporation, having heretofore
adopted the Schlumberger 1998 Stock Option Plan, effective January 21, 1998, and
having reserved the right under Section 12 thereof to amend the Plan, does
hereby amend the Plan, effective April 21, 1999, to read as follows:

   1. Section 2(d) of the Plan is hereby amended in its entirety to read as
      follows:

     "(d) If the exercise period of an outstanding Stock Option is continued
following a holder's termination of employment as provided in Section 5, and the
holder engages in 'detrimental activity' as described in Section 5, the
Committee shall have the authority in its discretion to cause such option to be
forfeited and certain option exercises thereunder to be rescinded as provided
for in Section 5."

   2. The Plan is hereby amended to add the following Section 5(c)(iv)(D):

     "(D) Notwithstanding the foregoing, if the optionee engages in 'detrimental
activity' (as hereinafter defined) within one year after termination of
employment for any reason other than retirement, the Committee, in its
discretion, may cause the optionee's right to exercise such option to be
forfeited.  Such forfeiture may occur at any time after the Committee determines
that the optionee has engaged in detrimental activity and prior to the actual
delivery of all shares subject to the option pursuant to the exercise of such
option.  If an allegation of detrimental activity by an optionee is made to the
Committee, the Committee, in its discretion, may suspend the exercisability of
the optionee's options for up to two months to permit the investigation of such
allegation.  In addition, if the optionee engages in detrimental, activity
within one year following termination of employment for any reason other than
retirement, the Committee, in its discretion, may rescind any option exercise
made within the period commencing six months preceding the date of the
optionee's termination of employment and ending three months following such
termination.  For purposes of this Section 5, 'detrimental activity' means
activity that is determined by the Committee in its sole and absolute discretion
to be detrimental to the interests of the Company or any of its subsidiaries,
including but not limited to situations where such optionee: (1) divulges trade
secrets of the Company, proprietary data or other confidential information
relating to the Company or to the business of the Company and any subsidiaries,
(2) enters into employment with a competitor under circumstances suggesting that
such optionee will be using unique or special knowledge gained as a Company
employee to compete with the Company, (3) uses information obtained during the
course of his or her prior employment for his or her own purposes, such as for
the solicitation of business, (4) is determined to have engaged (whether or not
prior to termination) in either gross misconduct or criminal activity harmful to
the Company, or (5) takes any action that harms the business interests,
reputation, or goodwill of the Company and/or its subsidiaries."

   3. Section 5(c)(v)(C) is hereby amended in its entirety to read as follows:

     "(D) Notwithstanding the foregoing, if the optionee engages in 'detrimental
activity' (as defined in Section 5(c)(iv)(D)) within five years after
termination of employment by reason of retirement, the Committee, in its
discretion, may cause the optionee's right to exercise such option to be
forfeited.  Such forfeiture may occur at any time after the Committee determines
that the optionee has engaged in detrimental activity and prior to the actual
delivery of all shares subject to the option pursuant to the exercise of such
option.  If an allegation of detrimental activity by an optionee is made to the
Committee, the Committee, in its discretion, may suspend the exercisability of
the optionee's options for up to two months to permit the investigation of such
allegation.  In addition, if the optionee engages in detrimental activity within
five years following termination of employment by reason of retirement, the
Committee, in its discretion, may rescind any option exercise made within the
period commencing six months preceding the date of the optionee's termination of
employment by retirement and ending one year following such termination."

                                      64

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