Document:

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                                                                EXHIBIT 10.10(a)

                                 AMENDMENT NO. 5
                                     TO THE
                 SUPPLEMENTAL RETIREMENT PLAN FOR EXECUTIVES OF
                        NATIONAL SERVICE INDUSTRIES, INC.

         THIS AMENDMENT made as of the 31st day of August, 2001, by National
Service Industries, Inc., a Delaware corporation ("NSI");

                              W I T N E S S E T H:

         WHEREAS, NSI has previously established the Supplemental Retirement
Plan for Executives of National Service Industries, Inc. (the "Plan") for the
benefit of its eligible employees and their beneficiaries; and

         WHEREAS, effective as of August 31, 2001, NSI will restructure its
business operations and form several new subsidiary corporations; and

         WHEREAS, NSI desires to amend the Plan in connection with the
restructuring; and

         WHEREAS, pursuant to the power of amendment contained in Article XI of
the Plan, the Plan is hereby amended as follows:

                                       1.

         The Plan is hereby amended by incorporating the following as the new
Schedule 1:

                                   "Schedule 1
                               Adopting Employers

         National Service Industries, Inc. (CA) f/k/a NSI Enterprises, Inc.
         L&C Spinco, Inc.
         The Zep Group, Inc.
         L&C Lighting Group, Inc."

                                       2.

         This Amendment shall be effective August 31, 2001.

                                       3.

         Except as provided herein, the provisions of the Plan shall remain in
full force and effect.

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         IN WITNESS WHEREOF, NSI has caused this Amendment No. 5 to be executed
by its duly authorized corporate officers as of the date and year first written
above.

ATTEST:                             NATIONAL SERVICE INDUSTRIES, INC.

By: /s/ Carol E. Morgan             By: /s/ Kenyon W. Murphy
   ----------------------------        --------------------------------<PAGE>

                                                                EXHIBIT 10.10(b)
                                 AMENDMENT NO. 6
                                       TO
                        SUPPLEMENTAL RETIREMENT PLAN FOR
                 EXECUTIVES OF NATIONAL SERVICE INDUSTRIES, INC.

         THIS AMENDMENT made as of the 30th day of November, 2001 by NATIONAL
SERVICE INDUSTRIES, INC., a Delaware corporation ("NSI");

                              W I T N E S S E T H:

         WHEREAS, NSI previously established the Supplemental Retirement Plan
for Executives of National Service Industries, Inc. (the "Plan") for the benefit
of its eligible executives and their beneficiaries; and

         WHEREAS, effective November 30, 2001, NSI is spinning off (the
"Spin-Off") its lighting and chemicals businesses through a tax-free
distribution of the stock of Acuity Brands, Inc. ("Acuity") to NSI's
stockholders; and

         WHEREAS, in connection with the Spin-Off, NSI and Acuity entered into
an Employee Benefits Agreement ("Benefits Agreement"), dated November 30, 2001,
which, among other things provides for the transfer to a supplemental retirement
plan to be established by Acuity ("Acuity SERP") of the liability for the
accrued benefits of certain participants in the Plan; and

         WHEREAS, NSI desires to provide for the transfer of such liabilities to
the Acuity SERP as provided in the Benefits Agreement and as hereinafter
provided; and

         WHEREAS, NSI also desires to amend the Plan to change the eligibility
rules for the Plan;

         NOW, THEREFORE, the Plan is hereby amended as follows:

                                       1.

         Effective as of November 30, 2001 ("Effective Date"), the Plan's
liability for the accrued benefits of employees and former employees of NSI and
its subsidiaries who were participants in the Plan and (i) who became or
remained employees of Acuity and its subsidiaries as of the Effective Date, or
(ii) who were formerly employed by the businesses transferred to Acuity by NSI
or (iii) who were formerly employed by the corporate office of NSI, shall be
transferred to the Acuity SERP. This transfer shall be accomplished in
accordance with the Benefits Agreement. In connection with such transfer to the
Acuity SERP, current Appendices A, B, C, D, E, F, G, and H shall be deleted in
their entirety and a new Appendix A and Schedule 1 in the form attached hereto
shall be added to the Plan.

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                                       2.

         Section 1.1(w) is hereby amended by deleting the present section in its
entirety and substituting the following in lieu thereof:

                  "(w) Executive - Any officer of the Company (or an affiliated
         company) designated by the Board or the Chief Executive Officer of the
         Company as eligible to participate in the Plan and who is listed on an
         Appendix attached hereto. The Appendix may designate the terms and
         conditions of Executive's participation in the Plan."

                                       3.

         This Amendment No. 6 to the Plan is effective as of November 30, 2001.
Except as hereby modified, the Plan shall remain in full force and effect.

         IN WITNESS WHEREOF, NSI has caused this Amendment No. 6 to be executed
as of the day and year first above written.

                                            NATIONAL SERVICE INDUSTRIES, INC.

                                            By: /s/ Brock A. Hattox
                                                -------------------

ATTEST:

/s/ Helen D. Haines
-------------------

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                                   APPENDIX A
                       (Effective As Of November 30, 2001)

A.1      Eligible Individual        Brock A. Hattox

A.2      Effective Date             Pursuant to Section 2.1(b), the Eligible
Individual's date of participation shall be September 18, 1996.

A.3      Special Provisions         The following special provisions shall apply
to the Eligible Individual's participation in the Plan.

         (a) The Eligible Individual will qualify as a Vested Terminee if he
completes 5 years of employment with NSI from September 9, 1996 to his
Termination Date.

         (b) If the Eligible Individual terminates employment with NSI after
attaining age 55, the Eligible Individual shall be eligible for Early Retirement
under Sections 1.1(a)(2) and 3.3, and his benefit will be determined as if he
had completed an additional five (5) years of service (including Credited
Service and Eligible Service, but not to exceed a total of 20 years) and was
five (5) years older (but not to exceed age 65).

         (c) If the Eligible Individual terminates employment with NSI after
attaining age 55, he shall have the right to elect (in a manner provided by the
Company) to be paid his retirement benefit (i) in an immediate lump sum payment
calculated by discounting the future payment stream at an interest rate equal to
the lesser of the GATT interest rate or the PBGC immediate annuity rate (or
similar rate which replaces such rate), with an assumed life span to age 85,
(ii) annual installments over a period of up to five (5) years or (iii) in
accordance with the usual rules of the Plan.

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                                   SCHEDULE 1

                               ADOPTING EMPLOYERS

National Service Industries, Inc. (CA) f/k/a NSI Enterprises, Inc.<PAGE>

                                                                EXHIBIT 10.11(a)

                                 AMENDMENT NO. 2
                                     TO THE
                        NATIONAL SERVICE INDUSTRIES, INC.
                     EXECUTIVES' DEFERRED COMPENSATION PLAN
                 (As Amended And Restated As Of October 4, 2000)

         THIS AMENDMENT made as of the 31st day of August, 2001, by National
Service Industries, Inc., a Delaware corporation ("NSI");

                              W I T N E S S E T H:

         WHEREAS, NSI has previously established the National Service
Industries, Inc. Executives' Deferred Compensation Plan (the "Plan") for the
benefit of its eligible employees and their beneficiaries; and

         WHEREAS, effective as of August 31, 2001, NSI will restructure its
business operations and form several new subsidiary corporations; and

         WHEREAS, NSI desires to amend the Plan in connection with the
restructuring; and

         WHEREAS, the Plan is hereby amended as follows:

                                       1.

         The Plan is hereby amended by incorporating the following as the new
Appendix A:

                                   "Appendix A
                               Adopting Employers

         National Service Industries, Inc. (CA) f/k/a NSI Enterprises, Inc.
         L&C Spinco, Inc.
         The Zep Group, Inc.
         L&C Lighting Group, Inc."

                                       2.

         This Amendment shall be effective August 31, 2001.

                                       3.

         Except as provided herein, the provisions of the Plan shall remain in
full force and effect.

<PAGE>

         IN WITNESS WHEREOF, NSI has caused this Amendment No. 2 to be executed
by its duly authorized corporate officers as of the date and year first written
above.

ATTEST:                                     NATIONAL SERVICE INDUSTRIES, INC.

By: /s/ Carol E. Morgan                     By: /s/ Kenyon W. Murphy
   -------------------------                   --------------------------------<PAGE>

                                                                EXHIBIT 10.11(b)

                                 AMENDMENT NO. 3
                                     TO THE
                        NATIONAL SERVICE INDUSTRIES, INC.
                     EXECUTIVES' DEFERRED COMPENSATION PLAN
                 (As Amended And Restated As Of October 4, 2000)

         THIS AMENDMENT made as of the 28th day of November, 2001, by National
Service Industries, Inc., a Delaware corporation ("Company");

                              W I T N E S S E T H:

         WHEREAS, the Company has previously established the National Service
Industries, Inc. Executives' Deferred Compensation Plan (the "Plan") for the
benefit of its eligible employees and their beneficiaries; and

         WHEREAS, in connection with the planned distribution of the shares of
common stock of Acuity Brands, Inc. to the stockholders of the Company (the
"Spin-Off"), the Company desires to amend the Plan to provide for the transfer
of accounts for certain employees and former employees of Acuity Brands, Inc.
and its subsidiaries to a deferred compensation plan being established by Acuity
Brands, Inc.;

         NOW, THEREFORE, the Plan is hereby amended as follows:

                                       1.

         The Plan is hereby amended by inserting the following as a new Section
10.02:

                  "10.02 Spin-Off of Acuity Brands, Inc. - Transfer of Accounts.
         Pursuant to an Employee Benefits Agreement dated as of November 30,
         2001, between the Company and Acuity Brands, Inc. ("Acuity") and in
         connection with the distribution of the shares of Acuity to the
         stockholders of the Company (the "Spin-Off"), the "Class Year Accounts"
         (and each sub-account) of each Participant who becomes or remains an
         employee of Acuity or its subsidiaries as of November 30, 2001 and of
         each Participant (including Participants and their beneficiaries in pay
         status) who was formerly employed by the businesses transferred to
         Acuity by the Company (including former employees of the corporate
         office of the Company) (collectively, the "Transferred Participants"),
         shall be transferred to the Acuity Brands, Inc. Executives' Deferred
         Compensation Plan ("Acuity Plan") as of November 30, 2001 or as soon as
         practical thereafter. The elections made by Transferred Participants
         under this Plan shall be carried over and shall apply for purposes of
         the Acuity Plan (subject to any change of election rights under the
         Acuity Plan)."

<PAGE>

                                       2.

         The Plan is hereby amended by incorporating the following as the new
Appendix A:

                                   "Appendix A
                               Adopting Employers

         National Service Industries, Inc. (CA) f/k/a NSI Enterprises, Inc."

                                       3.

         This Amendment shall be effective November 30, 2001. Except as provided
herein, the provisions of the Plan shall remain in full force and effect.

         IN WITNESS WHEREOF, the Company has caused this Amendment No. 3 to be
executed by its duly authorized corporate officers as of the date and year first
written above.

ATTEST:                                     NATIONAL SERVICE INDUSTRIES, INC.

By: /s/ Helen Haines                   By:  /s/ Brock A. Hattox
    -----------------------------           -----------------------------------

                                       2

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