Document:

<PAGE>   1
                                 EXHIBIT 10(g)

                                THIRD AMENDMENT
                                       OF
                  USG CORPORATION SUPPLEMENTAL RETIREMENT PLAN

             (As Amended and Restated Effective as of July 1, 1997)

               WHEREAS, USG Corporation Supplemental Retirement Plan (the
          "Plan"), established effective January 1, 1976 and amended from time
          to time, was last amended and restated in its entirety effective as of
          July 1, 1997; and

               WHEREAS, further amendment of the Plan now is considered
          desirable;

               NOW, THEREFORE, pursuant to the authority delegated to the
          undersigned by resolution of the Board of Directors of USG
          Corporation, the Plan be and is further amended, effective November 8,
          2000, as follows:

               1. By adding the following new subsection 3.8 to the Plan:

     "3.8      OFFSET/REDUCTION FOR BENEFITS PROVIDED BY FUNDING ACCOUNTS

     Although the plan is an unfunded, non-qualified compensation arrangement,
funds may be paid to the Participant or contributed to an individual trust
intended to constitute a grantor trust of a Participant under Section 671-678 of
the Internal Revenue Code of 1986, as amended (the "Code") or other funding
account established and maintained by a Participant pursuant to a funding
agreement between the Participant and USG (a "Funding Agreement"). If a
Participant has a Funding Agreement with USG, upon the Participant's death or
termination of employment for any reason, the Participant's Part A Supplemental
Benefits and Part A Supplemental Death Benefits will be offset/reduced to the
extent provided in the Funding Agreement to reflect the value of payments made
to the Participant and his or her grantor trust."

               2. By substituting the following for subsection 5.3 of the Plan:

     "5.3      FUNDING

     Benefits payable under this Plan to a Participant or a Supplemental Plan
Beneficiary shall be paid directly by the Employers from their general assets in
such proportions as the Company shall determine to the extent such benefits are
not paid from a Special Retirement Account (established pursuant to Supplement A
of this Plan) or from a Funding Account (as defined in subsection 3.8) or from a
so-called "rabbi trust", an irrevocable grantor trust the assets of which are
subject to the claims of creditors of the Employers in the event of their
insolvency. The Employers shall not be required to segregate on their books or
otherwise any amount to be used for the payment of benefits under this Plan,
except as to any amounts paid or payable to a Funding Account or to a "rabbi
trust"."

                                       24
<PAGE>   2
          IN WITNESS WHEREOF, the Company has caused these presents to be signed
     on its behalf by an officer thereunto duly authorized this 19th day of
     December, 2000.

                                        USG CORPORATION

                                        By:
                                           -------------------------------------
                                           Its: Vice President, Compensation,
                                                Benefits And Administration

                                       25<PAGE>   1
                                 EXHIBIT 10(o)

                                   YEAR 2000

                                     ANNUAL

                              MANAGEMENT INCENTIVE

                                    PROGRAM

                                USG CORPORATION

                                       26
<PAGE>   2
                                     PURPOSE

To enhance USG Corporation's ability to attract, motivate, reward and retain key
employees of the Corporation and its operating subsidiaries and to strengthen
the existing mutual interest between such key employees and the Corporation's
stockholders by providing incentive award opportunities to such key employees
who discharge their accountabilities in a manner which makes a measurable
contribution to the Corporation's earnings.

                                  INTRODUCTION

This Annual Management Incentive Program is in effect from January 1, 2000
through December 31, 2000.

                                   ELIGIBILITY

Individuals eligible for participation in this Program are those officers and
other key employees occupying management positions in Broadband 13 or higher
(775 or more hay points). Employees who participate in any other annual
incentive program of the Corporation or any of its subsidiaries are not eligible
to participate in this Program.

                                      GOALS

For the 2000 Annual Management Incentive Program, Net Earnings, Goal Income and
Strategic Targets for USG Corporation, Subsidiaries and Profit Centers will be
determined by the Grants and Awards Subcommittee of the Compensation and
Organization Committee of the USG Board of Directors (the "Subcommittee") after
considering recommendations submitted from USG Corporation and Operating
Subsidiaries. Except in the case of a Named Executive Officer (as defined in the
Administrative Guidelines below), Profit Center goals may be adjusted by the
Chairman of USG Corporation if business conditions or other significant
unforeseen circumstances beyond the control of the Profit Center have a major
impact on opportunity.

                                       27
<PAGE>   3
                                  AWARD VALUES

For the Annual Management Incentive Program, position target incentive values
are based on level of accountability and are expressed as a percent of approved
annualized salary. Resulting award opportunities represent a fully competitive
incentive opportunity for 100% (target) achievement of Corporate, Operating
Subsidiary and/or Profit Center goals:

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------------------
                                                                                  POSITION TARGET INCENTIVE

<S>                                                                               <C>
Chairman, President & CEO, USG Corporation                                                     70%
---------------------------------------------------------------------------------------------------------------
Vice Chairman, USG Corporation;                                                                60%
President & CEO, L&W Supply Corporation
---------------------------------------------------------------------------------------------------------------
Executive Vice President & Chief Financial Officer, USG Corporation                            50%

Senior Vice President & General Counsel, USG Corporation

Vice President, USG Corporation;
President & CEO, United States Gypsum Company

Vice President, USG Corporation;
President & CEO, USG Interiors, Inc.
---------------------------------------------------------------------------------------------------------------
USG CORPORATION & OPERATING SUBSIDIARIES
         OFFICERS AND MANAGERS
         Vice President, USG Corporation;                                                      45%
         Executive Vice President Strategic Manufacturing & Capital
            Investments, North American Gypsum and Worldwide Ceilings

         Executive Vice President - Operations, North American Gypsum

         Senior Vice President & Controller, USG Corporation;
         Executive Vice President Financial Operations, North
            American Gypsum and Worldwide Ceilings
---------------------------------------------------------------------------------------------------------------
         Vice President Research & Technology, USG Corporation                                 40%
         Executive Vice President & COO, L&W Supply Corporation
         Senior Vice President International, USG Interiors, Inc
         Vice President Human Resources, USG Corporation
         Vice President & Chief Information Officer, USG Corporation
         Vice President Communications, USG Corporation
         Vice President Corporate Customer Relations
---------------------------------------------------------------------------------------------------------------
USG CORPORATION, OPERATING SUBSIDIARIES & PROFIT CENTERS
         OFFICERS AND MANAGERS
         Position Reference Point: $159,450 and over                                           35%
         Position Reference Point: $146,470 - $159,449                                         30%
         Position Reference Point: $133,500 - $146,469                                         25%
         Position Reference Point: $119,890 - $133,449                                         20%
         Position Reference Point: $106,900 - $119,889                                         15%
         Position Reference Point: $  94,060 - $106,899                                        10%
---------------------------------------------------------------------------------------------------------------
The par opportunity for the General Manager, Materials Division is 35%.
</TABLE>

                                       28
<PAGE>   4
AWARDS

Incentive awards for all participants in the 2000 Annual Management Incentive
Program will be reviewed and approved by the Subcommittee.

THE TOTAL OF ALL INCENTIVE AWARDS PAID UNDER THIS PROGRAM WILL NOT EXCEED 4.0%
OF USG CORPORATION'S 2000 CONSOLIDATED GOAL INCOME. IN THE EVENT THAT AWARDS
OTHERWISE PAYABLE PURSUANT TO THE ANNUAL MANAGEMENT INCENTIVE PROGRAM EXCEED
SUCH AMOUNT, ALL AWARDS WILL BE REDUCED PRORATA TO AN AGGREGATE AMOUNT EQUAL TO
4.0%.

For all participants, the annual incentive award opportunity is the annualized
salary in effect at the beginning of the calendar year (March 1 of the calendar
year for the twenty most senior executives) multiplied by the applicable
position target incentive value percent.

Incentive awards for 2000 will be based on:

          NET EARNINGS:                      20% - 60% OF INCENTIVE
          based on the Corporation's year-end financial statements.

          GOAL INCOME:                       20% - 60% OF INCENTIVE
          (net sales less cost of sales and selling and administrative expenses)
               based on the Corporation's year-end financial statements.

          STRATEGIC FOCUS TARGET:   20% OF INCENTIVE

          PERSONAL PERFORMANCE:     20% OF INCENTIVE
          [except in the case of the twenty (20) most senior executives whose
               awards are based solely on degree of achievement of Net Earnings
               and/or Goal Income (60%) and Strategic Focus Target (40%)
               results].

               Except in the case of a Named Executive Officer, other
               appropriate performance measures as approved by the Subcommittee.

1.   For participants to qualify for the NET EARNINGS and/or GOAL INCOME segment
     comprising 60% of their award, their respective organization (e.g.
     Corporation/Group/ Subsidiary, etc. as described on page 6) must achieve
     75% or higher of its net earnings or goal income target.

2.   NET EARNINGS and GOAL INCOME segment award amounts will be determined
     according to the following schedule:

             Net Earnings/               Adjustment Factor for Corporate, Group,
             Goal Income Achievement     Subsidiary or Profit Center Performance
             -------------------------------------------------------------------
             Below     75%                                 0%
                       75%                                50%
                       80%                                60%
                       90%                                80%
                      100%                               100%
                      110%                               120%
                      120%                               140%
                      140%                               180%
                      150%                               200%

                                       29
<PAGE>   5
3.   For participants to qualify for the STRATEGIC FOCUS TARGET segment
     comprising 20% (40% for the twenty most senior executives) of their
     incentive award, their respective organization must achieve a minimum level
     of performance related to the specified strategic focus. The Strategic
     Focus Targets will be measurable, verifiable and derived from the formal
     strategic planning process (e.g., cost reduction, sales growth, market
     share gain, margins, etc.). The award adjustment factor for this segment
     will range from 0.5 (after achieving minimum performance levels) to 2.0 for
     maximum attainment. Participants will receive schedules of Strategic Focus
     Targets upon approval by the Subcommittee.

4.   Except with respect to the twenty (20) most senior executives (including
     the Named Executive Officers) whose awards are based solely on achievement
     of Net Earnings, Goal Income and Strategic Focus Targets, participants will
     have a third segment comprising 20% of their incentive award based upon
     their individual Personal Performance Rating according to the following
     schedule:

          Personal                                    Personal Performance
          Performance Rating                          Adjustment Range
          ----------------------------------------------------------------------
          Far Exceeded Expectations                   1.70 - 2.00
          ----------------------------------------------------------------------
          Exceeded Expectations                       1.20 - 1.50
          ----------------------------------------------------------------------
          Achieved Expectations                       1.00 - 1.10
          ----------------------------------------------------------------------
          Partially Achieved Expectations             0.80 - 0.90
          ----------------------------------------------------------------------
          Did Not Meet Expectations                   No Award
          ----------------------------------------------------------------------

     The maximum incentive award including all segments of this Program is 200%
     of the target incentive opportunity.

5.   Target incentive award opportunities and calculations of awards for
     participants will be based on the achievement of specific Corporate, Group,
     Subsidiary and/or Profit Center net earnings, goal income and strategic
     focus targets as displayed on the following page or as otherwise may be
     established subject to approval of the Chairman:

                                       30
<PAGE>   6
<TABLE>
<CAPTION>
                                            BASIS FOR
                                            FINANCIAL MEASURES                            BASIS FOR
                                            INCENTIVE AWARD                               STRATEGIC FOCUS
PARTICIPANTS                                (60% OF TARGET INCENTIVE)                     INCENTIVE AWARD
-------------------------------------------------------------------------------------------------------------
<S>                                         <C>                                                  <C>
USG CORPORATION

-   Senior Executive Management             60% Net Earnings, USG Corporation                    40%

-   USG Corporation Staff                   60% Net Earnings, USG Corporation                    20%

NORTH AMERICAN GYPSUM

-   VP, USG Corporation;                    20% Net Earnings, USG Corporation                    40%
    President & CEO, U.S. Gypsum Co         40% Goal Income, U.S. Gypsum Company
-   Exec VP - Operations, NAG

-   General Mgr - IGD                       10% Goal Income, North American Gypsum               20%
-   General Mgr - Materials Division        20% Goal Income, U.S. Gypsum Company
-   Profit Center Staff                     30% Goal Income, Profit Center/Division

-   Sr VP & General Mgr, CGC, Inc           20% Net Earnings, USG Corporation                    40%
                                            20% Goal Income,  North American Gypsum
                                            20% Goal Income, CGC, Inc

-   President & General Mgr, YPSA           20% Goal Income, North American Gypsum               20%
                                            40% Goal Income, YPSA

-   Customer Service Staff                  20% Net Earnings, USG Corporation                    20%
                                            20% Goal Income, U.S. Gypsum Company
                                            20% Goal Income, USG Interiors, Inc.

-   U.S. Gypsum Staff                       25% Goal Income, North American Gypsum               20%
                                            35% Goal Income, U.S. Gypsum Company

-   CGC, Inc Staff                          20% Goal Income, North American Gypsum               20%
                                            40% Goal Income, CGC, Inc

WORLDWIDE CEILINGS

-   VP, USG Corporation;                    20% Net Earnings, USG Corporation                    40%
    President & CEO, USG Interiors          40% Goal Income, Worldwide Ceilings
-   Sr VP International, USG Interiors

-   USG Interiors, Inc Staff                25% Goal Income, Worldwide Ceilings                  20%
                                            35% Goal Income, USG Interiors, Inc

L&W SUPPLY CORPORATION

-   Exec VP & COO, L&W Supply               20% Net Earnings, USG Corporation                    40%
                                            20% Goal Income, North American Gypsum
                                            20% Goal Income, L&W Supply

-   L&W Supply Corporation Staff            20% Goal Income, North American Gypsum               20%
                                            40% Goal Income, L&W Supply

                                            10% Goal Income, North American Gypsum               20%
                                            20% Goal Income, L&W Supply Corporation
                                            30% Goal Income, Profit Center (Business Unit)
</TABLE>

6.   SPECIAL AWARDS

     In addition to the incentive opportunity provided by this Program, a
     special award may be recommended for any participant or non-participant,
     other than a Named Executive Officer, who has made an extraordinary
     contribution to the Corporation's welfare or earnings.

                                       31
<PAGE>   7
GENERAL PROVISIONS

1.   The Subcommittee shall review and approve the awards recommended for
     officers and other employees who are eligible participants in the 2000
     Annual Management Incentive Program. The Subcommittee shall submit to the
     Board of Directors, for their ratification, a report of the awards for all
     eligible participants including corporate officers approved by the
     Subcommittee in accordance with the provisions of the Program.

2.   The Subcommittee shall have full power to make the rules and regulations
     with respect to the determination of achievement of goals and the
     distribution of awards. No awards will be made until the Subcommittee has
     certified goal achievement and applicable awards in writing.

3.   The judgement of the Subcommittee in construing this Program or any
     provisions thereof, or in making any decision hereunder, shall be final and
     conclusive and binding upon all employees of the Corporation and its
     subsidiaries whether or not selected as beneficiaries hereunder, and their
     heirs, executors, personal representatives and assigns.

4.   Nothing herein contained shall limit or affect in any manner or degree the
     normal and usual powers of management, exercised by the officers and the
     Board of Directors or committees thereof, to change the duties or the
     character of employment of any employee of the Corporation or to remove the
     individual from the employment of the Corporation at any time, all of which
     rights and powers are expressly reserved.

5.   No award will be paid to a Program participant who is not a regular
     full-time employee in good standing at the end of the calendar year to
     which the award applies; except an award which would otherwise be payable
     based on goal achievement may be recommended in the event of retirement,
     disability or death or in the event the participant is discharged without
     cause from the employment of the company during the year.

6.   The awards made to employees shall become a liability of the Corporation or
     the appropriate subsidiary as of December 31, 2000 and all payments to be
     made hereunder will be made as soon as practicable after said awards have
     been approved.

ADMINISTRATIVE GUIDELINES

1.   Award values will be based on annualized salary in effect for each
     qualifying participant at the beginning of the year (March 1 for the twenty
     most senior executives). Any change in duties, dimensions or
     responsibilities of a current position resulting in a new evaluation and an
     increase or decrease in reference points will be applied for Incentive
     Program purposes on a prorata basis with the respective reference point and
     target incentive value to apply for the actual number of full months of
     service at each evaluation except for such a change with respect to a Named
     Executive Officer, in which case any change in reference points and target
     incentive value, for any reason, shall not become effective until January 1
     of the following year.

2.   As provided by the Program, no award is to be paid any participant who is
     not a regular full-time employee in good standing at the end of the
     calendar year to which the award applies. However, in the event an eligible
     participant with three (3) or more months of active service in the Program
     year subsequently retires, becomes disabled or dies, or is discharged from
     the employment of the Company without cause, the participant (or
     beneficiary) may receive an award which would otherwise be payable based on
     goal achievement, prorated for the actual months of active service during
     the year.

3.   Employees participating in any other incentive or bonus program of the
     parent Corporation or a Subsidiary who are transferred during the year to a
     position covered by the Annual Management Incentive Program (other than a
     Named Executive Officer) will be eligible to receive a potential award
     prorated for actual full months of service in the two positions with the
     respective incentive program and target incentive values to apply. For
     example, a Marketing Manager promoted to Director, Marketing on August 1,
     will be eligible to receive a prorata award for seven months based on the
     Marketing Manager Plan provisions and values, and for five months under the
     Annual Management Incentive Program provisions and target incentive values.

                                       32
<PAGE>   8
4.   In the event of transfer of an employee (other than a Named Executive
     Officer) from an assignment which does not qualify for participation in any
     incentive or bonus plan to a position covered by the Annual Management
     Incentive Program, the employee is eligible to participate in the Annual
     Management Incentive Program with any potential award prorated for the
     actual months of service in the position covered by the Program during the
     year. A minimum of three months of service in the eligible position is
     required.

5.   Participation during the current Program year for individuals employed from
     outside the Corporation is possible with any award to be prorated for
     actual full months of service in the eligible position. A minimum of three
     full months of service is required for award consideration.

6.   Exceptions to established administrative guidelines can only be made by the
     Subcommittee and only with respect to participants other than Named
     Executive Officers.

7.   For purposes of this Program, a "NAMED EXECUTIVE OFFICER" will include any
     executive officer who is deemed a "named executive officer" for 2000 under
     Item 402 (a)(3) of Regulation S-K under the Securities Exchange Act of 1934
     and was employed by the Corporation or a Subsidiary on the last day of the
     year.

                                       33

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00020-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00020-of-00352.parquet"}]]