NATIONAL SERVICE INDUSTRIES INC
S-8, 1999-03-01
ELECTRIC LIGHTING & WIRING EQUIPMENT
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<PAGE>   1
     As filed with the Securities and Exchange Commission on March 1, 1999


                                                      Registration No. 33-
                                                                          ------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ----------------------

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                           --------------------------

                        NATIONAL SERVICE INDUSTRIES, INC.
             (Exact name of Registrant as specified in its charter)

           DELAWARE                                           58-0364900
           --------                                           ----------
(State or other jurisdiction of                              (IRS Employer
incorporation or organization)                               Identification No.)


               1420 PEACHTREE STREET, N.E., ATLANTA, GEORGIA 30309
               ---------------------------------------------------
               (Address of Principal Executive Offices) (Zip Code)


                          ENFORCER PRODUCTS 401(K) PLAN
                            (Full title of the Plan)


                                 Helen D. Haines
                        National Service Industries, Inc.
                                   NSI Center
                           1420 Peachtree Street, N.E.
                             Atlanta, Georgia 30309
                             ----------------------
                     (Name and address of agent for service)

   Telephone number, including area code, of agent for service: (404) 853-1207
                                                                --------------

<TABLE>
<CAPTION>
                                           CALCULATION OF REGISTRATION FEE
- ----------------------------------------------------------------------------------------------------------------------

 Title of securities to be      Amount to be           Proposed maximum       Proposed maximum           Amount of
         registered            registered (1)      offering price per share   aggregate offering      registration fee
                                                             (2)                 price (2)
- ----------------------------------------------------------------------------------------------------------------------
<S>                            <C>                 <C>                        <C>                      <C>    
National Service
Industries, Inc. Common
Stock, $1.00 par value and               50,000               $32.125            $1,606,250.00              $446.54
Preferred Stock Purchase                                                                         
Rights (3)
                                            
Participation in the                         (4)                   (5)                      (5)                  (5)
Enforcer Products 401(k)
Plan
</TABLE>

(1)      Pursuant to Rule 416(a) under the Securities Act of 1933, this
         Registration Statement also covers any additional shares that may
         hereafter be issued as a result of the adjustment provisions of the
         Enforcer Products 401(k) Plan.

<PAGE>   2

(2)      Estimated solely for purposes of calculating the registration fee.
         Determined in accordance with Rule 457(c) and Rule 457(h) under the
         Securities Act of 1933, based on the average of the high and low prices
         reported on the New York Stock Exchange on February 22, 1999.

(3)      The Preferred Stock Purchase Rights initially trade with the Common
         Stock.

(4)      In addition, pursuant to Rule 416(c) under the Securities Act of 1933,
         this registration statement also covers an indeterminate amount of
         interests to be offered or sold pursuant to the employee benefit plan
         described herein.

(5)      Not applicable.

         PART II. INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3.  INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE.

         The following documents filed by the registrant with the Commission are
incorporated herein by reference:

         (a)      the registrant's annual report on Form 10-K filed pursuant to
Section 13(a) of the Securities Exchange Act of 1934, as amended, for its fiscal
year ended August 31, 1998;

         (b)      the Proxy Statement dated November 23, 1998 filed by the
registrant pursuant to Section 14(a) of the Securities Exchange Act of 1934 for
the Annual Meeting of Stockholders held January 6, 1999, and all other reports
filed by the registrant pursuant to Section 13(a) or 15(d) of the Securities
Exchange Act of 1934 since August 31, 1998; and

         (c)      the description of the class of securities to be offered
hereby which is contained in any registration statements filed under Section 12
of the Securities Exchange Act of 1934, including any amendments or reports
filed for the purpose of updating such description.

         All other documents filed by the registrant pursuant to Sections 13(a),
13(c), 14 and 15(d) of the Securities Exchange Act of 1934 after the date of
filing of this Registration Statement and prior to the filing of a
post-effective amendment which indicates that all securities offered hereby have
been sold, or which deregisters all securities then remaining unsold, shall be
deemed to be incorporated herein by reference and to be a part hereof from the
date of filing of such documents.

ITEM 4.  DESCRIPTION OF SECURITIES.

         Omitted; inapplicable.

ITEM 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL.

         Omitted; inapplicable.

ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         Section 145 of the Delaware General Corporation Law ("Section 145")
generally provides that a director or officer of a corporation: (i) shall be
indemnified by the corporation for expenses in defense of any action or
proceeding in connection with his service to the corporation, if he is
successful in defense of the claims made against him; (ii) may, in actions other
than "derivative" and similar actions, be indemnified for expenses, judgments
and settlements even if he is not successful on the merits, if he acted in good
faith and in a manner he reasonably believed to be in or not opposed to the best
interests of the corporation (and in a criminal proceeding, if he had no
reasonable cause to believe his conduct was unlawful); and (iii) may be
indemnified by the corporation for expenses (but not judgments or settlements)
incurred to defend or settle any action by the corporation or a derivative
action (such as a suit by a shareholder alleging a breach by the director or 


                                       2
<PAGE>   3
officer of a duty owed to the corporation), even if he is not successful,
provided that he acted in good faith and in a manner he reasonably believed to
be in or not opposed to the best interests of the corporation, provided that no
indemnification is permitted without court approval if the individual was found
to be liable to the corporation. Before the permissive indemnification described
in clauses (ii) and (iii) above may be made pursuant to Section 145, either (i)
a majority of disinterested directors, (ii) a committee of one or more
disinterested directors designated by a majority of disinterested directors,
(iii) the stockholders, or (iv) under certain circumstances, independent legal
counsel in a written opinion, must determine that indemnification is appropriate
in the circumstances because the applicable standards of conduct have been met.

         Delaware law permits the advancement of expenses incurred by a proposed
indemnitee by the corporation in advance of final disposition of the action
provided the indemnitee undertakes to repay such advanced expenses if it is
ultimately determined that he is not entitled to indemnification. The
corporation may purchase insurance on behalf of an indemnitee against any
liability asserted against him in his designated capacity, whether or not the
corporation itself would be empowered to indemnify him against such liability.

         Delaware law also provides that the above rights will not be deemed
exclusive of other rights of indemnification or advancement of expenses granted
by by-law, agreement, vote of stockholders or disinterested directors or
otherwise, as to action in an indemnitee's official capacity and as to action in
another capacity while holding such office. The registrant's Certificate of
Incorporation and By-laws provide such additional rights.

         Article Fifteenth of the registrant's Certificate of Incorporation,
which provides contractual indemnification rights, was initially approved by the
registrant's stockholders in 1987. It provides for mandatory indemnification of
directors and officers to the full extent now authorized by the Delaware General
Corporation Law (as described above) or to the further extent indemnification
under the Delaware General Corporation Law is broadened in the future. Article
Fifteenth also mandates advancement of expenses incurred by a proposed
indemnitee, provided that, as long as Delaware law so requires, an undertaking
to repay (as described above) is delivered to the registrant.

         Article Fifteenth permits persons indemnified thereunder to bring suit
against the registrant to recover unpaid amounts claimed thereunder, with the
expense of bringing a successful suit to be paid by the registrant. Article
Fifteenth also provides that rights conferred therein are nonexclusive and that
the registrant may maintain insurance to protect a director or officer against
any expense, liability, or loss, whether or not the registrant had the power
under the Delaware General Corporation Law to indemnify such person against that
expense, liability, or loss.

         Section 7.8 of the registrant's By-laws provides rights to
indemnification with respect to conduct on or before January 5, 1987, when
Article Fifteenth was initially adopted. Section 7.8 provides indemnification
rights which are similar to, but somewhat narrower than, the rights extended by
Article Fifteenth.

         The registrant's directors and officers are insured against losses
arising from any claim against them in such capacities for wrongful acts or
omissions, subject to certain limitations.

ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMS.

         Omitted; inapplicable.


                                       3
<PAGE>   4

ITEM 8.  EXHIBITS.1

         4(i)     Relevant portions of the Restated Certificate of Incorporation
of registrant, filed as Exhibit 3(a) of registrant's Form 10-Q for the quarter
ended November 30, 1998 are incorporated herein by reference.

         4(ii)    Relevant portions of the By-Laws of registrant, filed as
Exhibit 3(b) to registrant's Annual Report on Form 10-Q for the quarter ended
November 30, 1998, are incorporated herein by reference.

         4(iii)   Enforcer Products 401(k) Plan.

         23       Consent of Arthur Andersen LLP

         24       Powers of Attorney authorizing David Levy and Brock Hattox to
sign this Registration Statement and amendments to this Registration Statement
on behalf of directors of the registrant.

         Neither an opinion of counsel concerning compliance of the plan with
ERISA nor an Internal Revenue Service (the "Service") determination letter is
submitted as an exhibit to the Registration Statement. In lieu thereof, the
Registrant undertakes to submit the Plan and any amendments thereto to the
Service in order to secure a determination letter in a timely manner and will
make all changes required by the Service in order to qualify the Plan and obtain
such letter.

ITEM 9.  UNDERTAKINGS.

         (a)      The undersigned registrant hereby undertakes:

                  (1)      To file, during any period in which offers or sales
are being made, a post-effective amendment to this registration statement:

                           (i)      To include any prospectus required by
         section 10(a)(3) of the Securities Act of 1933;

                           (ii)     To reflect in the prospectus any facts or
         events arising after the effective date of the registration statement
         (or the most recent post-effective amendment thereof) which,
         individually or in the aggregate, represent a fundamental change in the
         information set forth in the registration statement; and

                           (iii)    To include any material information with
         respect to the plan of distribution not previously disclosed in the
         registration statement or any material change in such information in
         the registration statement;

provided, however, that paragraphs (A)(1)(i) and (A)(1)(ii) above do not apply
if the information required to be included in a post-effective amendment by
those paragraphs is contained in periodic reports filed by the registrant
pursuant to section 13 or section 15(d) of the Securities Exchange Act of 1934
that are incorporated by reference in the registration statement.

                  (2)      That, for the purpose of determining any liability
under the Securities Act of 1933, each such post-effective amendment shall be
deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

- ---------------------
1 Exhibits are numbered in accordance with Item 601 of Regulation S-K.


                                       4
<PAGE>   5

                  (3)      To remove from registration by means of a
post-effective amendment any of the securities being registered which remain
unsold at the termination of the offering.

         (b)      The undersigned registrant hereby undertakes that, for
purposes of determining any liability under the Securities Act of 1933, each
filing of the registrant's annual report pursuant to section 13(a) or section
15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing
of an employee benefit plan's annual report pursuant to section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

         (c)      Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of the registrant pursuant to the provisions described under Item 6, or
otherwise, the registrant has been advised that in the opinion of the Securities
and Exchange Commission such indemnification is against public policy as
expressed in the Act and is, therefore, unenforceable. In the event that a claim
for indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a director, officer or controlling
person of the registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.

                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
registrant, National Service Industries, Inc., certifies that it has reasonable
grounds to believe that it meets all of the requirements for filing on Form S-8
and has duly caused this Registration Statement to be signed on its behalf by
the undersigned, thereunto duly authorized, in the City of Atlanta, State of
Georgia, on the 24th day of February, 1999.

                                     NATIONAL SERVICE INDUSTRIES, INC.



                                     By:   /s/ Helen D. Haines
                                           ------------------------------------
                                           Helen D. Haines
                                           Vice-President and Secretary


         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated:

SIGNATURES                           TITLE                            DATE


/s/ James S. Balloun     Chairman of the Board, President      February 24, 1999
- -----------------------  and Chief Executive Officer
James S. Balloun            


/s/ Brock Hattox         Executive Vice President and Chief    February 24, 1999
- -----------------------  Financial Officer
Brock Hattox               



                                       5
<PAGE>   6



/s/ Mark R. Bachmann         Vice President and Controller    February 24, 1999
- -------------------------
Mark R. Bachmann


/s/ John L. Clendenin    *   Director                         February 24, 1999
- -------------------------
John L. Clendenin


/s/ Thomas C. Gallagher  *   Director                         February 24, 1999
- -------------------------
Thomas C. Gallagher


/s/ Robert M. Holder, Jr.*   Director                         February 24, 1999
- -------------------------
Robert M. Holder, Jr.


/s/ David Levy               Director                         February 24, 1999
- -------------------------
David Levy


/s/ Charles W. McCall   *    Director                         February 24, 1999
- -------------------------
Charles W. McCall


/s/ John G. Medlin, Jr. *    Director                         February 24, 1999
- -------------------------
John G. Medlin, Jr.


/s/ Sam Nunn            *    Director                         February 24, 1999
- -------------------------
Sam Nunn


/s/ Herman J. Russell    *        Director                    February 24, 1999
- -------------------------
Herman J. Russell


/s/ Betty L. Siegel      *        Director                    February 24, 1999
- -------------------------
Betty L. Siegel


/s/ Barrie A. Wigmore    *        Director                    February 24, 1999
- -------------------------
Barrie A. Wigmore


*By: /s/ David Levy
     ----------------------------                        
     David Levy, Attorney-in-Fact


                       (Signatures continued on next page)




                                       6
<PAGE>   7




         Pursuant to the requirements of the Securities Act of 1933, the
trustees (or other persons who administer the employee benefit plan) have duly
caused this registration statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Atlanta, State of Georgia
on February 24, 1999.


                                 ENFORCER PRODUCTS 401(K) PLAN

                                 By:  National Service Industries, Inc., Plan
                                      Administrator



                                 By: /s/ James S. Balloun
                                     -----------------------------------------
                                          James S. Balloun
                                          Chairman of the Board, President
                                          and Chief Executive Officer



















                                       7
<PAGE>   8




                                INDEX TO EXHIBITS


<TABLE>
<CAPTION>
                                    Description                                       Page No.
                                    -----------                                       --------

<S>               <C>                                                              <C>
Exhibit 4(i)      Relevant portions of the Restated Certificate of Incorporation   Incorporated by 
                  of registrant, filed as Exhibit 3(a) of Registrant's Form 10-Q      reference
                  for the quarter ended November 30, 1998.

Exhibit 4(ii)     Relevant portions of the By-Laws of registrant, filed as         Incorporated by
                  Exhibit 3 to  registrant's Annual Report on Form 10-Q for the       reference
                  quarter ended November 30,  1998.

Exhibit 4(iii)    Enforcer Products 401(k) Plan

Exhibit 23        Consent of Arthur Andersen LLP

Exhibit 24        Powers of Attorney authorizing David Levy and Brock Hattox to
                  sign this Registration Statement and amendments to this
                  Registration Statement on behalf of directors of the
                  Registrant.
</TABLE>
















                                       8

<PAGE>   1
                                                                  EXHIBIT 4(iii)


                         ENFORCER PRODUCTS 401(K) PLAN

                       (Effective As Of January 1, 1999)



                            SUMMARY PLAN DESCRIPTION




- -------------------------------------------------------------------------------

This document constitutes part of the prospectus covering securities that have 
been registered under the Securities Act of 1933

- -------------------------------------------------------------------------------



Date of Distribution:
                     -----------------------

<PAGE>   2

                               TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                                                                        PAGE NUMBER
                                                                                                        -----------

<S>                                                                                                     <C>
ABOUT THIS BOOKLET................................................................................................1

SUMMARY OF KEY FEATURES...........................................................................................2

PARTICIPATION IN THE PLAN.........................................................................................4

CONTRIBUTIONS TO THE PLAN.........................................................................................4

INVESTMENT OF YOUR ACCOUNT........................................................................................7

BENEFITS AND PAYMENT OF BENEFITS.................................................................................11

FEDERAL INCOME TAX CONSIDERATIONS................................................................................16

WITHDRAWALS AND LOANS UNDER THE PLAN.............................................................................17

YEARS OF SERVICE, VESTING AND REEMPLOYMENT.......................................................................19

PLAN ADMINISTRATION..............................................................................................21

CLAIMS UNDER THE PLAN............................................................................................22

AMENDMENT AND TERMINATION OF THE PLAN............................................................................24

MISCELLANEOUS....................................................................................................25

BASIC PLAN DATA..................................................................................................27

GLOSSARY.........................................................................................................28

INVESTMENT FUNDS AND INVESTMENT PERFORMANCE......................................................................31
</TABLE>

<PAGE>   3

                               ABOUT THIS BOOKLET


General

This booklet provides the Summary Plan Description for the ENFORCER PRODUCTS
401(K) PLAN (the "Plan"), as amended and restated effective as of January 1,
1999. The Plan covers eligible employees of Enforcer Products, Inc. (the
"Employer") and certain of its affiliates. The purpose of the Plan is to
encourage eligible employees to regularly save a part of their compensation on a
tax-deferred basis and to provide them a way to accumulate additional amounts
for retirement.

This booklet is intended to provide a summary of the major provisions of the
Plan. Your benefits are described as clearly as possible with minimal use of
technical words and phrases appearing in the legal documents. However, the
official plan documents remain the final authority on the Plan's terms and, in
the event of conflict with this booklet, shall govern in all cases. Also, this
booklet is subject to amendment for changes required to the Plan by the
Internal Revenue Service and for any other changes to the final Plan document.

Prospectus

This document also constitutes part of a prospectus relating to 50,000 shares
of National Service Industries, Inc. Common Stock, par value $1.00 per share,
and interests in the Plan, which are offered pursuant to the provisions of the
Plan.



                                      -1-
<PAGE>   4

                            SUMMARY OF KEY FEATURES

                  This section summarizes the key features of the Plan; more
detailed information follows this Summary. This Summary is cross-referenced for
your convenience to the Questions which immediately follow. Also, a "Glossary"
of important Plan terms appears at pages 28 through 30.

                  ELIGIBILITY: Any employee of Enforcer Products, Inc. who has
(i) attained age 21, and (ii) completed 6 months of service is eligible to
participate in the Plan by completing the Plan enrollment form. (See Question
1.)

                  EMPLOYEE CONTRIBUTIONS: You may contribute 1% to 15% of your
Compensation by payroll deduction to the Plan on a "pre-tax" basis. You can
change the amount of your Pre-Tax Contributions at any time. (See Questions 3
and 5.) There is an annual dollar limit on your Pre-Tax Contributions, and
certain highly compensated employees may be subject to additional limitations.
(See Question 6.) Pre-tax contributions are not subject to federal (and in most
cases, state) income tax in the year in which they are made. Taxes on your
Pre-Tax Contributions (and any investment earnings on those contributions) are
delayed until your Plan account is paid to you. (See Questions 21 and 22.)

                  EMPLOYER CONTRIBUTIONS: The Employer will make a Matching 
Contribution to the Plan on your behalf. The amount of the Matching
Contribution will be determined by the Employer each year in its discretion.
(See Question 7.) The Employer, at its discretion, may also make a Profit
Sharing Contribution to the Plan on your behalf. The amount of any Profit
Sharing Contributions will be determined by the Employer. (See Question 7.)

                  VESTING: The Matching Contributions and Profit Sharing
Contributions made by the Employer on your behalf are subject to a "vesting
schedule" that is based on your Years of Service. (See Questions 19 and 26.)
You will receive a Year of Service for each Plan Year in which you complete
1,000 or more Hours of Service. You are always fully (100%) Vested in the
Pre-Tax Contributions and Rollover Contributions (if any) you make to the Plan.

                  DISTRIBUTIONS: Your Vested Interest in the Plan will
generally be paid to you as soon as possible after you terminate employment,
retire, or become Disabled. However, if the value of your Account exceeds
$5000, you may choose to delay payment until a later date. If you die, your
beneficiary will receive your Plan Account. If you became a Participant on or
after January 1, 1999, your Plan Account will automatically be paid to you in a
single lump sum. If you became a Participant prior to January 1, 1999, you may
elect among other forms of payment. Depending on the balance of your Account at
the time it is to be paid to you, certain portions of it may be paid to you in
shares of NSI Common Stock. (See Questions 16 through 20.)

                  INVESTMENTS: The Plan gives you the right and responsibility
to direct the investment of your Plan Account, except for Matching
Contributions and Profit Sharing Contributions, which will automatically be
invested in the NSI Stock Fund. (See Question 11.)



                                      -2-
<PAGE>   5

You may invest the remainder of your Plan Account among the Investment Funds
available under the Plan, and change your investment election on any business
day. (See Question 12.)

                  HARDSHIP WITHDRAWALS: If you have an immediate and
substantial financial hardship that meets one of the purposes specified in IRS
rules (see Question 23), you will be permitted to withdraw a portion of your
Plan Account due to the hardship. However, you will be suspended from making
Pre-Tax Contributions to the Plan for 12 months following your withdrawal. The
minimum amount of a hardship withdrawal is $1,000. You may make only one
hardship withdrawal each calendar year. Hardship withdrawals are subject to
ordinary income tax and, in most cases, a 10% premature withdrawal penalty tax.

                  LOANS: You may also elect to take a loan from your Plan
Account once each calendar year. The minimum loan amount is $1,000 and is
secured by your vested interest. The maximum amount you may borrow is 50% of
your vested interest (but not more than $50,000). Loans are repaid through
payroll deduction over a period of 5 years or less. The interest rate is
determined by the Plan Administrator. You may only have one loan outstanding at
a time. (See Question 24.)

                  ACCOUNT INFORMATION AND BENEFITS PHONE: As described in
Questions 4, 5 and 12, you may obtain information about your Plan Account,
change the amount of your Pre-Tax Contributions, or change the investment of
your Plan Account by calling a special 24-hour "800" telephone number called
the "Benefits Phone". The Benefits Phone provides you a convenient way to keep
track of your investments and change how your Plan Account is invested.



                                      -3-
<PAGE>   6

                           PARTICIPATION IN THE PLAN

1.       WHO IS ELIGIBLE TO PARTICIPATE IN THE PLAN AND WHEN?

                  (a)      Eligible Employees - You are eligible to participate
in the Plan if you are an employee of Enforcer Products, Inc. You will not be
eligible to participate in the Plan if you are (i) a leased employee, (ii) an
independent contractor, or (iii) a union employee whose collective bargaining
agreement does not provide for Plan participation.

                  (b)      Participation - If you have completed at least 6
months of service and have attained age 21, you are eligible to participate in
the Plan.

                  (c)      Enrollment - Once you have met the age and service
requirements, you can begin to participate on the first day of the following
month. You must also complete the necessary enrollment forms within the time
prescribed by the Plan Administrator. If you do not elect to participate
immediately upon meeting the eligibility requirements, you may defer your
enrollment to any future time, as long as you remain an eligible employee.

                  (d)      Continued Participation in the Plan - You will
continue to participate in the Plan until you retire, become Disabled, die,
terminate employment, or otherwise cease to be in the eligible employee group.

                  (e)      Impact on Other Benefits - Your participation in the
Plan will not affect your entitlement to federal Social Security benefits or
any other retirement benefits provided by the Employer for which you may be
eligible.

                           CONTRIBUTIONS TO THE PLAN


2.       WHO CONTRIBUTES TO THE PLAN?

                  Both you and the Employer contribute to the Plan. You can
elect to contribute a portion of your Compensation each year to the Plan on a
pre-tax basis. The Employer makes Matching Contributions based on the amount
you contribute, and may, at its discretion, make Profit Sharing Contributions
to the Plan on your behalf.



                                      -4-
<PAGE>   7

3.       HOW CAN I MAKE PRE-TAX CONTRIBUTIONS?

                  You may elect to contribute from 1% to 15% of your annual
Compensation, in 1% increments, to the Plan on a pre-tax basis. These Pre-Tax
Contributions will be credited to your Pre-Tax Account.

                  You elect to make Pre-Tax Contributions by completing an
election form provided by the Plan Administrator. Your initial election to make
Pre-Tax Contributions will become effective as soon as practicable after you
become eligible to participate and will generally be effective for the first
payroll period beginning or after the date you become eligible. Your election
will continue in effect until you change it or stop participating in the Plan.

4.       WHAT IS THE "BENEFITS PHONE"?

                  The Benefits Phone is provided through the Plan recordkeeper,
INVESCO, and it is a convenient way to make changes in your Pre-Tax
Contributions, obtain information about the value of your Plan Account, and
make changes regarding the investment of your Account. After you enroll in the
Plan, you will be assigned a Personal Identification Number ("PIN") which will
allow you to use the 24-hour, "800" telephone number to make these changes and
find out about your Account and the amount in each Investment Fund. You will
receive a written confirmation of any changes you make through use of the
Benefits Phone.

5.       CAN I CHANGE OR STOP MY PRE-TAX CONTRIBUTIONS?

                  You may change your existing Pre-Tax Contribution election by
using the Benefits Phone or by delivering an executed change form to the Plan
Administrator. Any changes must be made in 1% increments and will be effective
as soon as practicable after the Plan Administrator receives your executed
change form. Once your new election becomes effective, it will remain in effect
until you stop participating in the Plan or until you make a subsequent change.

                  You may also elect to stop your Pre-Tax Contributions by
following the same procedure for changing your election. Unless you are
prevented from making Pre-Tax Contributions because of a hardship withdrawal,
you may resume making Pre-Tax Contributions as of the first day of any month,
provided adequate advance notice is given.



                                      -5-
<PAGE>   8

6.       ARE MY PRE-TAX CONTRIBUTIONS TO THE PLAN LIMITED?

                  IRS rules restrict the amount of Pre-Tax Contributions you
can make to the Plan. During any calendar year, you may never contribute more
than an IRS dollar limit (which is "indexed" annually to reflect increases in
the cost of living). The 1999 calendar year limit on Pre-Tax Contributions, for
example, is $10,000. This indexed limit applies not only to Pre-Tax
Contributions under this Plan, but also to any other pre-tax contributions you
may have made to other 401(k) plans, simplified employee pension plans, or
tax-favored annuity plans, whether maintained by the Employer or another
employer. You should notify the Plan Administrator by March 1 if you made
contributions to another such plan during the prior calendar year.

                  In addition, a special nondiscrimination test, known as the
"average deferral percentage" test, may limit the amount that Highly
Compensated Employees may contribute to the Plan on a pre-tax basis during a
Plan Year. To the extent that actual Pre-Tax Contributions exceed this limit,
that excess will be distributed to the appropriate Highly Compensated
Employee(s), with earnings (if any). The Plan Administrator reserves the right
to reduce or limit Pre-Tax Contributions during the year if it appears that
excess deferrals will otherwise occur.

7.       HOW MUCH DOES NSI CONTRIBUTE AS A MATCHING CONTRIBUTION OR A PROFIT 
         SHARING CONTRIBUTION?

                  For each month in which you make Pre-Tax Contributions, the
Employer will make a Matching Contribution to your Matching Contribution
Account in an amount determined at its discretion. Matching Contributions will
be made in the form of NSI Common Stock, or in cash which will be used to
purchase NSI Common Stock, and are subject to special IRS nondiscrimination
rules similar to those described in Question 6. If Matching Contributions on
your behalf are restricted by these rules, you will be notified.

                  The Employer, at its discretion, may also make a Profit
Sharing Contribution to the Plan on your behalf. The amount of any Profit
Sharing Contributions will be determined by the Employer at its discretion.

8.       CAN I MAKE ROLLOVER CONTRIBUTIONS TO THE PLAN?

                  Yes, in accordance with rules established by the Plan
Administrator, you may elect to make a direct transfer of your account balance
from another employer's qualified retirement plan to this Plan. However, the
Plan will not accept rollover contributions from an individual retirement
account ("IRA").



                                      -6-
<PAGE>   9

9.       WHEN WILL I RECEIVE A STATEMENT SHOWING THE VALUE OF MY ACCOUNTS?

                  You will receive a statement showing the value of your Plan
Account as of the last day of each calendar quarter. This statement will
indicate how your Account is invested and the activity in your Account since
the preceding statement. You may also call the Benefits Phone to determine the
value of your Account.


10.      ARE THERE ANY LIMITATIONS ON THE AMOUNTS THAT MAY BE CONTRIBUTED TO MY
         PLAN ACCOUNTS?

                  Yes, the total amount of Pre-Tax Contributions, Matching
Contributions, and Profit Sharing Contributions that can be allocated to your
Account each year is limited by law to the lesser of (i) 25% of your
Compensation, or (ii) $30,000. The $30,000 limit may be increased in the future
in accordance with the tax laws and cost-of-living increases.

                           INVESTMENT OF YOUR ACCOUNT

11.      WHO IS RESPONSIBLE FOR THE INVESTMENT OF MY ACCOUNT IN THE PLAN?

                  The assets of the Plan are held in a trust fund by the
Trustee. However, the Plan is designed so that you have the responsibility for
directing how your Pre-Tax Account and Rollover Account are invested. Your
Matching Contribution Account and Profit Sharing Account are automatically
invested in the NSI Stock Fund. The Investment Funds presently offered by the
Plan are described briefly below. Additional information on the Investment
Funds and their investment performance will be provided to you with this
Summary Plan Description (see "INVESTMENT FUNDS AND INVESTMENT PERFORMANCE"
starting on page 31). The Investment Funds are:

                  (1)      Stable Value Fund - This fund is a fixed income fund
         which is designed to provide a steady level of current income and
         preservation of principal. The fund is invested in a diversified
         portfolio of investment contracts issued by highly-rated financial
         institutions. The fund's rate of return will fluctuate and it is not
         intended to provide a guaranteed rate of return.

                  (2)      The Balanced Fund - This fund is invested in a
         changing mix of high quality stocks and bonds. The fund is designed to
         provide capital growth and current income while limiting the risk of
         principal loss. This fund has a greater level of risk than the Stable
         Value Fund. Investments in the fund are subject to fluctuations in
         value and there is no guarantee of investment performance.



                                      -7-
<PAGE>   10

                  (3)      Diversified Equity Fund - This fund is a diversified
         stock fund designed to invest in a broad range of common stocks and to
         provide capital growth through investment in the stocks of large
         well-known companies. This fund has a higher level of risk than the
         Balanced Fund. Investments in the fund are subject to fluctuations in
         value and there is no guarantee of investment performance.

                  (4)      NSI Stock Fund - This fund is invested primarily in
         NSI Common Stock, although it may hold other short-term investments
         from time to time. The objective of the fund is to provide long-term
         capital appreciation through the ownership of NSI Common Stock.
         Because the fund will only hold one stock, it lacks diversification
         and may be subject to higher risks and greater fluctuations than a
         diversified portfolio. You may not direct that more than 50% of your
         Pre-Tax Account and if applicable, Rollover Account, be invested in
         this fund. The entire amount of your Matching Contributions and Profit
         Sharing Contributions will automatically be invested in this fund.

                  (5)      S&P 500 Index Fund - This fund is invested in stocks
         in the Standard & Poor's 500 Composite Stock Price Index. The
         objective of the fund is to match the performance and risk
         characteristics of the unmanaged S&P 500 Index in order to provide
         long-term growth. Investments in this fund are subject to
         fluctuations, and there is no guarantee of investment performance.


                  (6)      Small Company Growth Fund - This fund is designed to
         provide long-term growth by investing primarily in a diversified group
         of stocks in small or undiscovered companies that show potential for
         increased size, profitability and market awareness. This fund does not
         seek current income, and is designed more for long-term gains.
         Investments in this fund are subject to fluctuations, and there is no
         guarantee of investment performance.

                  (7)      International Fund - This fund is invested in stocks
         of companies outside the United States. This fund is designed to
         achieve long-term growth through investing in companies with
         significantly better financial and return characteristics than their
         peer groups. This fund, which is well diversified and not heavily
         traded, achieves its return primarily from capital appreciation (an
         increase in stock prices) rather than dividends. Investments in this
         fund are subject to fluctuations, and there is no guarantee of
         investment performance.

                  (8)      Bond Index Fund - This fund is invested in U.S. 
         Treasury, agency, corporate, mortgage-backed, and asset-backed
         securities. This fund is designed to match the returns of the Lehman
         Brothers Aggregate Bond Index by investing in a well-diversified
         portfolio that is representative of the domestic investment grade bond
         market.



                                      -8-
<PAGE>   11

         Investments in this fund are subject to fluctuations, and there is no
         guarantee of investment performance.

The Investment Funds may be changed or modified from time to time by the Plan's
Investment Committee.

12.      HOW DO I DIRECT THE INVESTMENT OF MY ACCOUNT?

                  You will be provided with a form by the Plan Administrator on
which you will indicate how you want your existing Pre-Tax and Rollover Account
balances invested, as well as your future Pre-Tax and/or Rollover Contributions
to the Plan. You must direct the investment of your Pre-Tax and Rollover
Accounts in 5% increments. If you fail to submit an investment election which
properly directs the investment of your entire Pre-Tax Account and Rollover
Account, the portions not designated for investment will be invested in the
Stable Value Fund.

                  You may change your investment on any business day. Any
change can be made using the Benefits Phone. Changes made on the Benefits Phone
before 4:00 p.m. Eastern Time will be effective as of the close of business on
the same business day. Changes made after 4:00 p.m. will be effective as of the
close of the following business day. You may also make an investment change by
completing a new investment election forms provided by the Plan Administrator.

                  As described earlier, you will be provided a statement
showing the investment and value of your Plan Account as of the end of each
calendar quarter. If you have any questions concerning the status of your
Account, you should use the Benefits Phone or contact the Plan Administrator.


13.      BECAUSE I CHOOSE MY INVESTMENTS, AM I RESPONSIBLE FOR THE INVESTMENT
         PERFORMANCE OF MY ACCOUNT?

                  Yes. Because you control the investment of your Account, you
are responsible for the investment results. The Plan is intended to be covered
by a special provision of federal law - Section 404(c) of ERISA and related
Department of Labor regulations. Under this provision, fiduciaries of the Plan
are relieved of liability for any losses which are the direct and necessary
result of any investment instruction given by you.

                  The Investment Funds available under the Plan are described
in Question 11. Question 11 and the other materials provided to you regarding
the Investment Funds give information concerning the investment objectives and
risk and return characteristics of each fund, information relating to the type
and diversification of assets held by each fund, a description of any
transaction fees and expenses which may affect your Account, and the designated
investment manager (if any) for each fund.



                                      -9-
<PAGE>   12

                  Question 12 gives a description of how to invest in the
various Investment Funds, an explanation of how to change the investment of
your existing Pre-Tax and Rollover Account balances and your future
contributions, and any limitations relating to your investment choices.
Question 14 provides additional information concerning your investment in the
NSI Stock Fund, as well as information about your ability to exercise voting,
tender and similar rights with respect to the NSI Common Stock allocated to
your Account.

                  All Participant investment elections are made by using the
Benefits Phone or by completing investment election forms, both of which are
administered by the Plan's recordkeeper. The recordkeeper also maintains your
Account balance records and, together with the Trustee, is responsible for
distributing Account statements and proxy materials related to NSI Common Stock
to you. As a result of these procedures, your investment transactions and
Account information remain confidential, including information relating to your
holding of NSI Common Stock.

14.      WHO EXERCISES THE VOTING AND SIMILAR RIGHTS WITH RESPECT TO THE NSI
         COMMON STOCK HELD BY THE PLAN?

                  You must direct the Trustee how to vote the shares of NSI
Common Stock allocated to your Account on all matters presented to the NSI
shareholders. You will be given the proxy materials provided to NSI
shareholders, along with instructions as to how to direct the Trustee to vote
your shares. If you do not direct the Trustee how to vote, the shares allocated
to your Account will not be voted.

                  If there is a tender offer or exchange offer for the NSI
Common Stock, you must also direct the Trustee whether to tender or exchange
the shares allocated to your Account. If you fail to direct the Trustee
regarding a tender or exchange offer, it will be treated as a direction not to
tender or exchange the shares.

                  All Participant directions regarding the voting, tender, or
exchange of NSI Common Stock will be transmitted directly to the Trustee. That
way, your direction will remain confidential and no one at NSI will know how
you voted.

                  If the Plan holds any shares of NSI Common Stock that are not
allocated to Participants, the Investment Committee will determine how such
shares are voted, and whether they will be tendered or exchanged.



                                     -10-
<PAGE>   13

15.      WHAT IF I NEED ADDITIONAL INFORMATION ABOUT AN INVESTMENT FUND?

                  You can obtain additional information through the Benefits
Phone or by contacting the Plan Administrator at the address and telephone
number listed in the Basic Plan Data (see page 27). The following information
will be provided upon request for each Investment Fund (to the extent such
information is relevant and available):

         -        annual operating expenses of the Investment Fund that may 
                  affect the investment return;

         -        copies of prospectuses, financial statements and reports, and
                  listings of fund assets that have been furnished to the Plan;
                  and

         -        the value of shares or units in the Investment Fund
                  (including those held in your Plan Account), as well as the
                  past and current investment performance of the Investment
                  Fund.

                  The Plan recognizes that it is important for you to have
sufficient information concerning your investment choices, so please do not
hesitate to use the Benefits Phone or contact the Plan Administrator to obtain
the information you need.

                        BENEFITS AND PAYMENT OF BENEFITS

16.      WHEN CAN I RETIRE AND HOW MUCH OF MY ACCOUNT WILL BE PAID TO ME?

                  You will be entitled to receive the entire balance of your
Plan Account if you retire at your Normal Retirement Date (the date you reach
age 65). You may continue working for the Employer past your Normal Retirement
Date and continue to participate in the Plan until you actually retire, as long
as you continue to meet the Plan's eligibility requirements.

                  You will also be entitled to receive the entire balance of
your Account if you retire on or after your Early Retirement Date (the date you
reach age 55 and complete at least 6 Years of Service).


17.      WHAT WILL I RECEIVE IF I BECOME DISABLED?

                  If you become Disabled while actively working for the
Employer, you will become 100% Vested and entitled to receive the entire amount
in your Account. The Plan Administrator will determine whether you are Disabled
based on competent medical evidence.



                                     -11-
<PAGE>   14

In making its determination, the Plan Administrator may require you to be
examined by a physician at the Employer's expense. If it is determined that you
are not Disabled, you will have the right to a review of that determination
under the claims review procedure described in Question 33.

18.      WHAT WILL MY BENEFICIARY RECEIVE IF I DIE?

                  If you die while you are actively working for the Employer,
you will become 100% Vested and your beneficiary (or beneficiaries) will be
entitled to receive the entire amount in your Account paid in a single lump
sum. When you become a Participant, the Plan Administrator will give you a form
on which you will designate one or more beneficiaries. If you are married and
wish to designate someone other than your spouse as your beneficiary, you will
have to obtain a written, properly witnessed or notarized statement from your
spouse consenting to the designation of an alternate beneficiary. If you are
married at the time of death and have not properly designated another
beneficiary, your surviving spouse will receive the entire amount of your
Account.

                  Certain special rules apply to any Employee who became a
Participant in the Plan prior to January 1, 1999:

                  -        If you die before payment of your benefits start and
                           you are married at the time of your death, your
                           spouse will receive the entire amount in your
                           Account payable in the form of an annuity for the
                           life of your spouse. In lieu of a life annuity, your
                           spouse may elect any of the optional forms of
                           payment discussed in Question 20.

                  -        If you are not married at the time of your death, or
                           if your spouse consented in writing to your
                           designation of another beneficiary, your entire
                           Account will be paid to your designated beneficiary
                           in a single lump sum payment.

                  -        If you die after payment of your Vested Interest has
                           begun, payments will continue to be made in
                           accordance with your elected form of payment.

19.      WHAT WILL I RECEIVE IF I TERMINATE EMPLOYMENT PRIOR TO RETIREMENT?

                  If you quit your job or you are discharged by the Employer
before you reach either your Normal Retirement Date or Early Retirement Date,
you will be entitled to 100% of your Pre-Tax Contributions and Rollover
Contributions (if any). You will also be entitled to the Vested portion of the
Matching Contributions and Profit Sharing Contributions credited to your
Account. Your Vested Interest in your Matching Contribution Account and Profit
Sharing Account depends upon your Years of Service at the time you terminate
employment. You will



                                     -12-
<PAGE>   15

be credited with one Year of Service for each Plan Year in which you complete
1,000 or more Hours of Service with the Employer (see Question 26). If you
worked at least one Hour of Service on or after January 1, 1999, your Vested
Interest will be determined in accordance with the vesting schedule below:

<TABLE>
<CAPTION>
            Completed                                 Amount Subject
         Years of Service       Vested Percentage     to Forfeiture 
         ----------------       -----------------     --------------
         <S>                    <C>                   <C>
            Less than 1               0%                  100%
                  1                  20%                   80%
                  2                  40%                   60%
                  3                  60%                   40%
                  4                  80%                   20%
              5 or more             100%                    0%
</TABLE>

                  For example, if you have earned 3 Years of Service for
vesting purposes at the time you terminate employment, you will be entitled to
60% of your Matching Contribution Account and Profit Sharing Account. If you
are credited with 4 Years of Service, you would be 80% Vested, and so forth.
The portions of your Matching Contribution Account and Profit Sharing Account
in which you are not Vested will be "forfeited" and used to reduce the
Employer's Matching Contributions for the Plan Year in which the forfeiture
occurs. If you did not work an Hour of Service after December 31, 1998, your
Vested Interest will be determined under the Plan's prior vesting schedule.

                  If your employment terminates when you are only partially
Vested and any part of your Vested Interest is paid to you, you may have a
right to "buy-back" the amount you forfeited. This "buy-back" right only
applies if you are rehired before you have incurred 5 consecutive Breaks in
Service, and you pay back to the Plan the full amount that was paid to you when
you terminated employment. Any such repayment must be made not later than the
5th anniversary of your rehire. If you pay back the amount which you previously
received, then the amount of forfeited Matching and/or Profit Sharing
Contributions will also be restored. If you are rehired after 5 consecutive
Breaks in Service, you cannot buy back the amount of Matching and/or Profit
Sharing Contributions you forfeited.

                  If you have no Vested Interest in your Matching Contribution
Account and Profit Sharing Account when you terminate employment, those
accounts will be forfeited at the time your employment with the Employer
terminates.

20.      WHEN AND HOW WILL MY ACCOUNT BE PAID?

                  Payment of your Account will generally be paid to you in a
lump sum as soon as reasonably possible following the date on which you retire,
become Disabled, or otherwise terminate employment. However, if your Vested
Interest exceeds $5,000, you can delay payment



                                     -13-
<PAGE>   16

until the date you attain age 65. In the event of your death, your Vested
Interest will be paid to your beneficiary(ies) as described in Question 18.

                  In general, lump sum distributions will be paid in cash.
However, if your Vested Interest exceeds $5,000, your Matching Contribution
Account and Profit Sharing Account (which are automatically invested in the NSI
Stock Fund) will be distributed in whole shares of NSI Common Stock, with any
fractional shares paid in cash. If the number of whole shares of NSI Common
Stock to be distributed is less than 100, you may elect to receive cash instead
of shares. A Participant receiving a lump sum distribution may also elect to
receive any remaining portion of his Account that is invested in the NSI Stock
Fund in whole shares of NSI Common Stock (with fractional shares paid in cash).

                  When your Account becomes payable to you, you may also direct
the Plan Administrator to transfer the amount in your Account directly to an
IRA or to another tax-qualified retirement plan that accepts direct rollovers.
At the time your Account becomes payable to you, the Plan Administrator will
provide you with more information concerning this right.

                  Certain special distribution rules apply to any employee who
became a Participant in the Plan prior to January 1, 1999:

         -        If you are not married at the time your Plan Account is to be
                  paid to you, you will automatically receive your benefits in
                  the form of a single life annuity. This means that you will
                  receive monthly annuity payments for the duration of your
                  lifetime. Upon your death, no further payments will be made.
                  In lieu of a life annuity, you may elect any of the optional
                  forms of payment described below.

         -        If you are married at the time your Plan Account is to be 
                  paid to you, you will automatically receive your benefits in
                  the form of a qualified joint and survivor annuity. This
                  means that you will receive monthly payments during your
                  lifetime, and upon your death, your spouse will continue to
                  receive monthly payments equal to 50% of the monthly payments
                  you were receiving for the duration of his or her lifetime.
                  In lieu of a qualified joint and survivor annuity, you and
                  your spouse may elect any of the optional forms of payment
                  described below. Your spouse's consent to an optional form of
                  payment must be in writing and must be witnessed by a notary
                  public or a Plan representative. The Plan Administrator will
                  provide a form for this purpose.

         If you are subject to the special distribution rules described above,
you may elect to receive your benefit in any of the following optional forms of
payment. However, if the value of your Vested Interest is $5000 or less at the
time it is to be paid to you, payment will automatically be made in a single
lump sum.



                                     -14-
<PAGE>   17

                      Lump Sum -- Under this option, you will receive your
                      Vested Interest in a single sum payment. If you elect
                      this option, this single payment is the only payment you
                      will receive from the Plan.

                      Installments -- Under this option, you will receive your
                      Vested Interest in substantially equal, periodic
                      installments over a period of time designated by you (not
                      to exceed your life expectancy).

                      Single Life Annuity -- Under this option, you will
                      receive your Vested Interest in monthly annuity payments
                      for the duration of your lifetime. Upon your death, no
                      further payments will be made.

                      Single Life Annuity with Period Certain -- Under this
                      option, you will receive your Vested Interest in monthly
                      annuity payments for a guaranteed period of 5,10 or 15
                      years (as you elect). This option is available with or
                      without an installment refund.

                      50% or 100% Survivorship Annuities -- Under these
                      options, you will receive reduced monthly annuity
                      payments for the duration of your lifetime so that, upon
                      your death, 50%, 66-2/3%, or 100% (as you choose) of the
                      monthly amount you were receiving will continue to be
                      paid to your beneficiary for his or her lifetime. (Your
                      beneficiary may, but need not, be your spouse.)

                      Fixed Period Annuity -- Under this option, you will
                      receive your Vested Interest in monthly annuity payments
                      for a guaranteed number of months which is not less 60
                      and not more than the life expectancy of you and your
                      beneficiary.



                                     -15-
<PAGE>   18

                       FEDERAL INCOME TAX CONSIDERATIONS

21.      HOW ARE CONTRIBUTIONS TO THE PLAN TREATED FOR FEDERAL INCOME TAX
         PURPOSES, AND WHEN WILL I BE TAXED ON AMOUNTS CREDITED TO MY ACCOUNT?

                  The Plan and its related trust are intended to be qualified
under Sections 401(a), 401(k), and 501(a) of the Internal Revenue Code of 1986,
as amended. This means that, for federal income tax purposes, the Employer's
Matching Contributions and Profit Sharing Contributions and your Pre-Tax
Contributions are not taxed to you as income in the year such contributions are
made. Instead, these amounts are taxed at the time your Account is paid to you.
Taxes on the investment earnings on these contributions are also deferred until
your Plan Account is paid to you.

                  Pre-Tax Contributions, as well as Matching Contributions and
Profit Sharing Contributions made by the Employer, will be deductible by the
Employer for federal income tax purposes.

22.      WHAT TAXES WILL APPLY TO MY PLAN DISTRIBUTION?

                  Any amounts paid to you from the Plan will generally be fully
taxable as ordinary income in the year in which they are paid to you. However,
if your lump sum distribution includes shares of NSI Common Stock, you may
exclude from current taxation any "net unrealized appreciation" on such shares
(i.e., the value of such stock at the time of distribution over its cost basis
to the Plan). Also, if you receive a lump sum distribution after you attain age
59 1/2, special tax rules could apply to reduce the amount of income tax you
would otherwise pay. If you receive a distribution before age 59 1/2 and it is
not on account of your death, becoming Disabled, or termination of employment
after attainment of age 55, you may have to pay a 10% excise tax in addition to
regular income taxes.

                  You can postpone paying tax on your Plan distribution by
rolling it over or having it directly transferred to another qualified plan or
IRA. However, unless you have your distribution directly transferred to another
qualified plan or an IRA, federal income tax will automatically be withheld.

                  You will receive additional information regarding special tax
rules, rollovers, and direct transfers at the time you receive your Plan
distribution.

                  TAX LAWS CHANGE FREQUENTLY. IF YOU HAVE SPECIFIC QUESTIONS
CONCERNING THE INCOME TAX EFFECTS OF ANY PARTICULAR PLAN DISTRIBUTION, YOU ARE
ENCOURAGED TO CONSULT A TAX ADVISOR.



                                     -16-
<PAGE>   19

                      WITHDRAWALS AND LOANS UNDER THE PLAN

23.      MAY I WITHDRAW AMOUNTS FROM MY PLAN ACCOUNT PRIOR TO TERMINATION OF
         EMPLOYMENT?

                  Because the Plan is designed to help you save for your
retirement, withdrawals while you are still employed should only be made when
absolutely necessary. There are 2 types of withdrawals: (i) hardship
withdrawals, and (ii) withdrawals after age 59 1/2.

                  HARDSHIP WITHDRAWALS

                  In the event you incur a financial hardship (as described
below), you may request a hardship withdrawal by making written application on
a form prescribed by the Plan Administrator. The amount you can withdraw is
limited to your Pre-Tax Contributions, unless you were a Participant prior to
January 1, 1998, in which case the amount available for withdrawal includes the
Vested portion of your Matching Contribution Account and Profit Sharing
Account. Earnings on your Pre-Tax Contributions may not be withdrawn.

                  You will only be eligible for a hardship withdrawal in the
following circumstances:

         -        The withdrawal must be due to a financial emergency involving
                  (i) the payment of uninsured or unreimbursed medical expenses
                  for you and/or your spouse or dependent (or necessary for
                  those persons to obtain such services); (ii) the purchase of
                  your principal residence (but not mortgage payments or rent);
                  (iii) the payment of post-secondary educational expenses for
                  the next 12 months for your education or the education of
                  your spouse, children, or dependents; or (iv) the payment of
                  amounts necessary to prevent your eviction from your
                  principal residence or the foreclosure on the mortgage on
                  your principal residence. The existence of a financial
                  emergency will be determined by the Plan Administrator.

         -        The withdrawal request must state that you cannot satisfy the
                  financial need (i) through insurance or other reimbursement,
                  (ii) by the sale of nonessential assets owned by you, your
                  spouse, or minor children which are reasonably available to
                  you, (iii) by ceasing or reducing your contributions to the
                  Plan, (iv) by other distributions or loans available from any
                  retirement plan, or (v) by obtaining a loan from a commercial
                  source on reasonable terms.

         -        Any hardship withdrawal must be for at least $1,000, and only
                  one withdrawal will be permitted during any calendar year.



                                     -17-
<PAGE>   20

         -        The amount of the withdrawal request must not exceed the
                  amount necessary to satisfy the financial need, less any
                  available resources described above. However, the amount of
                  the withdrawal may include income taxes or penalties
                  reasonably expected to result from the distribution.

         -        If your request for a hardship withdrawal is approved, you
                  will be suspended from making Pre-Tax Contributions (and
                  receiving related Matching Contributions) for 12 months.

         -        You must promptly submit any information required by the Plan
                  Administrator regarding your hardship withdrawal request.

         -        If your Account is invested in more than one Investment Fund,
                  withdrawals will be made proportionately from each Investment
                  Fund in which your Account is invested. All hardship
                  withdrawals will be distributed in cash.

                  AGE 59 1/2 WITHDRAWals

                  Once you have reached age 59 1/2, you may, upon written
notice to the Plan Administrator, withdraw all or any portion of your Vested
Interest. You are limited to 2 such withdrawals during any 12-month period.

24.      CAN I GET A LOAN FROM THE PLAN?

                  If you are an actively-employed Participant, you may obtain a
loan from the Plan by making a written request on the form prescribed by the
Plan Administrator (or, if available, by using the Benefits Phone). The maximum
amount you may borrow is the lesser of (i) 50% of your Vested Interest, or (ii)
$50,000 (reduced by any outstanding loan balance due). The minimum amount you
may borrow is $1,000. You cannot request more than one loan during any calendar
year, and you can never have more than one Plan loan outstanding at a time.

                  If your Plan loan is approved, you must sign a promissory
note agreeing to repay the amount of the loan, including interest, to the
Trustee. The loan will be treated as a segregated investment of your Account
and payments of principal and interest on the loan will be credited directly to
your Account. The rate of interest on the loan will be determined by the Plan
Administrator and it will reflect the rate in effect for similar loans on the
date you apply for the loan. Loan initiation charges and annual loan
maintenance fees will be charged against your Account.

                  All Plan loans will be subject to the following requirements:



                                     -18-
<PAGE>   21

         -        payments must be substantially equal in amount over the term
                  of the loan and must be made by payroll deduction (these
                  payments are on an after-tax basis), although the final loan
                  payment may be made by check,

         -        the loan must be repaid within 5 years,

         -        prepayment of the loan will be permitted, but only if the
                  total outstanding balance is paid in full,

         -        50% of your Vested Interest (or the amount of your loan, if
                  less) will be security for the loan, and

         -        if you leave employment or die, the balance of your loan will
                  become immediately due and payable, and will be offset
                  against any Plan distribution to you or your beneficiary.

You can obtain more information regarding loans from the Plan Administrator.

25.      CAN MY PLAN ACCOUNT BE ASSIGNED OR ATTACHED TO PAY A DEBT?

                  No. In general, your Plan Account cannot be pledged,
assigned, encumbered, or attached in any way. Thus, for example, you cannot
pledge your Plan Account to secure a personal loan from a bank. However, your
Plan Account can be attached or assigned pursuant to a Qualified Domestic
Relations Order ("QDRO"). A QDRO is a decree or order of a court relating to
the provision of child support, alimony payments, or marital property rights to
a spouse, former spouse, child or other dependent. In some cases, the Plan
Administrator will need time to review a QDRO to make sure it meets certain
legal requirements and, during that time, the Plan may restrict any withdrawals
or distributions to you from your Plan Account.

                   YEARS OF SERVICE, VESTING AND REEMPLOYMENT

26.      WHAT IS A YEAR OF SERVICE AND HOW DO YEARS OF SERVICE AFFECT MY 
         INTEREST IN THE PLAN?

                  Subject to the Break in Service rules, you will accumulate
one Year of Service for each Plan Year in which you complete 1,000 or more
Hours of Service working for the Employer, including Plan Years prior to the
date the Plan was established. Years of Service are used to determine the
portion of your Plan Account in which you are "Vested". For a more detailed
description of vesting and the vesting schedule, see Question 19. You are
always 100% Vested in your Pre-Tax Contributions and Rollover Contributions.



                                     -19-
<PAGE>   22

27.      IF I TERMINATE EMPLOYMENT AND AM LATER REHIRED, HOW CAN I BECOME A
         PARTICIPANT AGAIN?

                  As described earlier, you will cease to be an active
Participant in the Plan if you retire or otherwise terminate employment. If you
were a Participant in the Plan when you stopped working for the Employer, you
will be eligible to participate in the Plan again as soon as practicable
following your return to active employment with the Employer. You must complete
a new election form before you may resume making Pre-Tax Contributions. If you
stop working for the Employer, and you were not previously a Participant in the
Plan, you must generally satisfy the participation requirements as if you were
a new employee.

28.      IF I BECOME A PARTICIPANT AGAIN, WHAT HAPPENS TO MY EARLIER YEARS OF
         SERVICE?

                  If you terminate employment and incur a Break in Service,
your earlier Years of Service will be counted upon your rehire if you had a
Vested Interest in your Matching Contribution Account and/or Profit Sharing
Account at the time of your Break in Service. Even if you did not have a Vested
Interest in these accounts at the time of your Break in Service, your earlier
Years of Service will be counted unless the number of consecutive Breaks in
Service you incur is 5 or more. In all other cases, your prior Years of Service
will not be counted upon your rehire.

                  For purposes of the Plan, a "Break in Service" is a Plan Year
in which you are credited with 500 or less Hours of Service. Solely for the
purpose of determining whether a Break in Service has occurred, however, if you
are not working because of pregnancy, adoption, or the related care of a new
child, you will receive credit for the service which would have been performed
during that time except for such an absence.

                  An authorized leave of absence for military service does not
constitute a Break in Service for Plan purposes. Any period during which you
are on leave for military service will be considered service for the Employer,
provided you return to work for the Employer at the end of such leave.

29.      WHAT IF I TRANSFER TO OR FROM EMPLOYMENT WITH ANOTHER DIVISION OF NSI?

                  If you transfer employment to a class of Employees not
eligible to participate in the Plan, your Pre-Tax Contributions to the Plan
will stop at the time of your transfer. You will, however, continue to receive
vesting credit under the Plan for your subsequent employment with the
NSI-related entities.



                                     -20-
<PAGE>   23

                  The amount in your Plan Account will not be paid to you at
the time of transfer, but it will remain in the Plan. Your Account will be paid
to you when you terminate employment with all NSI-related entities.

                  If you transfer employment to a class of Employees eligible
to participate in the Plan, your prior service with NSI-related entities will
be counted for eligibility and vesting purposes under the Plan. If you meet the
eligibility requirements as of your date of transfer, you can participate in
the Plan as soon as administratively practical after your transfer.

30.      WHO CAN ANSWER QUESTIONS CONCERNING YEARS OF SERVICE AND BREAKS IN 
         SERVICE?

                  Generally, the Plan Administrator should be able to answer
your questions. Because the rules governing these matters are very complicated,
please feel free to ask questions when you have problems or are unclear as to
the application of the rules in a particular situation.

                              PLAN ADMINISTRATION

31.      WHO MANAGES THE PLAN AND WHO PAYS THE PLAN'S EXPENSES?

                  The Plan is administered by the Plan Administrator, which is
NSI. The Plan has retained INVESCO as recordkeeper to perform a number of
administrative duties for the Plan. The Plan Administrator has the exclusive
discretionary authority to interpret and construe the Plan and direct the
payment of benefits under the Plan. Any interpretation or determination made
pursuant to such discretionary authority will be upheld on judicial review,
unless it is shown that the interpretation or determination was arbitrary and
capricious. You should direct all claims for Plan benefits, as well as any
questions concerning your rights under the Plan, to the Plan Administrator.

                  The fees and expenses related to investments under the Plan,
including the investment management fees for the Investment Funds and the
brokerage commissions, fees and other expenses related to the purchase and sale
of NSI Common Stock, will be charged to the Investment Funds and the return
earned by the funds will be net of such fees and expenses. Although the Plan
provides for payment of administrative expenses from Plan assets, it is NSI's
current intention to pay the Plan's administrative fees and expenses, including
the administrative costs of the recordkeeper.



                                     -21-
<PAGE>   24

32.      WHAT YEAR DOES THE PLAN USE FOR ACCOUNTING AND OTHER PURPOSES?

                  The Plan and all of its records are kept on a Plan Year
basis. The Plan Year is January 1 through December 31.

                             CLAIMS UNDER THE PLAN

33.      WHAT DO I DO IF I HAVE A DISPUTE OR A CLAIM RELATING TO MY ACCOUNT?

                  In the event your request for a Plan benefit is wholly or
partially denied, you will receive a written notice of the denial from the Plan
Administrator within 60 days of the date the dispute arose or the date the Plan
Administrator received your initial claim. If special circumstances require an
extension of the time in which to reply, written notice of such extension will
be given to you before the end of the initial 60-day period. In no case will
the additional period extend more than 60 days beyond the end of the initial
decision period. If you do not receive a response to your claim for a Plan
benefit within 60 days of the date you filed the claim, it will be considered
denied.

                  The written notice of the decision will contain (i) specific
reasons for the denial, (ii) specific references to the particular provisions
in the Plan on which the denial is based, (iii) a description of any additional
material or information necessary for you to submit, and (iv) an explanation of
why such material or information is necessary. You will also be provided with
the description of the Plan's claim review procedure which includes the right
to examine all Plan documents and other papers which directly relate to your
claim. You may have a representative (lawyer or other person) assist you in
reviewing these documents and you or this representative may argue against the
denial in writing by submitting your arguments and comments to the Plan
Administrator. You have 60 days after receipt of the claim denial in which to
request this review.

                  The Plan Administrator will generally make its decision on
review within 60 days after receipt of your request for review or in some
special circumstances within an additional period (not to exceed another 60
days) as may be necessary to decide the claim. It will be written in an
understandable manner and will contain specific reasons for the decision and
specific references to pertinent Plan provisions on which the denial is based.
If you receive no response at all within the time allowed, the claim is
considered denied.

                  As described earlier, the Plan Administrator has the
discretionary authority to make determinations regarding claims for Plan
benefits.



                                     -22-
<PAGE>   25

34.      IS THE PLAN COVERED BY ERISA AND WHAT RIGHTS ARE AVAILABLE TO 
         PARTICIPANTS UNDER THE PLAN OR UNDER ERISA?

                  The Plan is subject to certain provisions of ERISA, including
those provisions that set standards of responsibility for Plan fiduciaries,
establish minimum standards for participation and vesting, and require that
each Participant be furnished with information concerning the Plan and its
operations.

                  As a Participant in the Plan, you are entitled to certain
rights and protections under ERISA. ERISA provides that all Plan participants
shall be entitled to:

                  (i)      Examine, without charge, at the Plan Administrator's
         office and at other principal employer facilities, all Plan documents,
         including copies of all documents filed by the Plan with the U.S.
         Department of Labor, such as annual reports and plan descriptions;

                  (ii)     Obtain copies of all Plan documents and other Plan
         information upon written request to the Plan Administrator, for which
         the Plan Administrator may make a reasonable charge;

                  (iii)    Receive a summary of the Plan's annual financial
         report, which the Plan Administrator is required by law to furnish
         you;

                  (iv)     Obtain a statement telling you whether you have a
         right to receive benefits under the Plan at normal retirement age and
         if so, what your benefits would be at normal retirement age if you
         stop working now. If you do not have a right to a benefit, the
         statement will tell you how many more years you have to work before
         you have a right to a benefit. This statement must be requested in
         writing and is not required to be given more than once a year. The
         Plan must provide the statement free of charge.

                  In addition to creating rights for the Plan participants,
ERISA imposes duties upon the people who are responsible for the operation of
the Plan. The people who operate your Plan, called "fiduciaries" of the Plan,
have a duty to do so prudently and in the interest of you and other Plan
participants and beneficiaries.

                  No one, including NSI or any other person, may terminate your
employment or otherwise discriminate against you in any way to prevent you from
obtaining a Plan benefit or exercising your rights under ERISA. As described
above, if your claim for a Plan benefit is denied in whole or in part, you must
receive a written explanation of the reason for the denial. You have the right
to have the Plan Administrator review and reconsider your claim.

                  Under ERISA, there are steps you can take to enforce the
above rights. For instance, if you request materials from the Plan and do not
receive them within 30 days, you may



                                     -23-
<PAGE>   26

file suit in a federal court. In such a case, the court may require the Plan
Administrator to provide the materials and pay you up to $110 a day until you
receive the materials, unless the materials were not sent because of reasons
beyond the control of the Plan Administrator. If you have a claim for benefits
which is denied or ignored, in whole or in part, you may file suit in a state
or federal court. If it should happen that Plan fiduciaries misuse the Plan's
money, or if you are discriminated against for asserting your rights, you may
seek assistance from the U.S. Department of Labor, or you may file suit in a
federal court. The court will decide who should pay court costs and legal fees.
If you are successful, the court may order the person you have sued to pay
these costs and fees. If you lose, the court may order you to pay these costs
and fees, for example, if it finds your claim is frivolous.

                  If you have any questions about the Plan, you should contact
the Plan Administrator. If you have any questions about this statement or about
your rights under ERISA, you should contact the nearest office of the Pension
and Welfare Benefits Administration, U.S. Department of Labor, listed in your
telephone directory or the Division of Technical Assistance and Inquiries,
Pension and Welfare Benefits Administration, U.S. Department of Labor, 200
Constitution Avenue, N.W., Washington, D.C. 20210.

                     AMENDMENT AND TERMINATION OF THE PLAN

35.      WHO HAS THE AUTHORITY TO AMEND THE PLAN?

                  NSI retains the authority to amend or revise the Plan at any
time in its discretion. However, no such amendment can have the effect of
taking away your Vested Interest in the Plan or causing any part of the trust
fund to revert to NSI. Any amendment shall be pursuant to resolution of the
Board of Directors of NSI or such other procedures as may be authorized by
resolution of the Board.

36.      HOW LONG WILL THE PLAN BE CONTINUED?

                  The Plan has been established by NSI with the intention that
it will be continued indefinitely. However, NSI reserves the right, at any
time, to terminate or partially terminate the Plan. In the event of a
termination or partial termination of the Plan, each Participant who is then
actively employed by the Employer and who is affected by such action will
become 100% Vested in his Plan Account, regardless of his Years of Service.



                                     -24-
<PAGE>   27

                                 MISCELLANEOUS

37.      IS THIS PLAN INSURED?

                  No. The insurance coverage of the Pension Benefit Guaranty
Corporation only applies to certain types of pension plans and does not apply
to defined contribution plans (such as this Plan) in which each Participant has
an individual account.

38.      WHAT IS A TOP-HEAVY PLAN AND HOW DOES THE PLAN CHANGE IF IT BECOMES
         TOP-HEAVY?

                  Federal law requires the Plan to contain special provisions
that apply in the event a significant portion of the Plan's assets become
payable to highly-paid employees. These provisions, called "top-heavy rules",
provide for more rapid vesting of Plan Accounts and certain minimum
contribution levels if the Plan becomes top-heavy. The Plan is not top-heavy at
the present time and it is unlikely it will ever become top-heavy. Therefore,
the top-heavy rules will most likely not affect you. However, if the Plan ever
becomes top-heavy, you will be notified.

39.      WHAT ADDITIONAL INFORMATION RELATING TO NSI IS AVAILABLE UPON REQUEST?

                  The following documents filed by NSI with the Securities and
Exchange Commission are incorporated in and made a part of the prospectus by
reference and are available without charge, upon written or oral request to the
individual identified below:

         -        NSI's latest Annual Report on Form 10-K filed pursuant to
                  Section 13 of the Securities Exchange Act of 1934 (the
                  "Exchange Act");

         -        All reports filed by NSI pursuant to Sections 13(a) or 15(d)
                  of the Exchange Act since the end of the year covered by
                  NSI's annual report on Form 10-K referred to above;

         -        The description of common stock contained in NSI's
                  Registration Statement filed under Section 12 of the Exchange
                  Act, including all amendments or reports filed for the
                  purpose of updating such description; and

         -        All other documents subsequently filed by NSI and the Plan
                  pursuant to Sections 13(a), 13(c) 14 and 15(d) of the
                  Exchange Act prior to the filing of a post-effective
                  amendment which indicates that all securities offered by this
                  prospectus have been sold or which deregisters all such
                  securities that remain unsold.



                                     -25-
<PAGE>   28

                  The consolidated financial statements of NSI incorporated
into this prospectus have been audited by Arthur Andersen & Co., independent
auditors, at the dates and as set forth in their report incorporated herein,
and are included in reliance upon such report given upon the authority of such
firm as experts in accounting and auditing.

                  Other documents which are required to be delivered to
employees pursuant to Rule 428(b) under the Securities Act of 1933 are
available without charge, upon written or oral request.

                  Requests for additional documents should be directed to: 
National Service Industries, Inc., NSI Center, 1420 Peachtree Street, N.E.,
Atlanta, Georgia 30309, Attention: Allan Zeitlin, Vice President - Employee
Benefits (telephone: (404) 853-1231).




                                     -26-
<PAGE>   29

                                BASIC PLAN DATA

<TABLE>
<S>                                 <C>
Name of Plan:                       Enforcer Products 401(k) Plan


Plan Number:                        068


Plan Sponsor:                       National Service Industries, Inc.
                                    NSI Center
                                    1420 Peachtree Street, N.E.
                                    Atlanta, Georgia 30309


Plan Sponsor's                      58-0364900
Employer Identification Number
("EIN"):


Plan Administrator:                 National Service Industries, Inc.
                                    NSI Center
                                    1420 Peachtree Street, N.E.
                                    Atlanta, Georgia 30309
                                    Tel. No.: (404) 853-1000

                                    The Plan Administrator can be contacted
                                    through Allan Zeitlin, Director - Employee
                                    Benefits, at the address and telephone
                                    number set forth above.


Agent for Service                   David Levy, Executive Vice President, 
of Legal Process:                   Administration 
                                       and Counsel
                                    National Service Industries, Inc.
                                    NSI Center
                                    1420 Peachtree Street, N.E.
                                    Atlanta, Georgia 30309

                                    Legal notices may also be served upon the
                                    Plan Trustee and Plan Administrator.


Plan Trustee:                       Institutional Trust Company
                                    400 Colony Square, Suite 2200
                                    1201 Peachtree Street, N.E.
                                    Atlanta, Georgia 30361

Plan Year:                          January 1 through December 31.
</TABLE>



                                     -27-
<PAGE>   30

                                    GLOSSARY


         Benefit plans are a specialized subject and, of necessity, include
some technical terms. Here, to help you understand them, are brief definitions:

         ACCOUNT - The combination of the Participant's accounts in the Plan -
his Pre-Tax Account, his Matching Contribution Account, his Profit Sharing
Account and his Rollover Account.

         BENEFITS PHONE - The automated telephone system which may be utilized
to obtain information on, and engage in various transactions involving, your
Plan Account.

         BREAK IN SERVICE - A Plan Year in which you are credited with 500 or
less Hours of Service with the Employer or an affiliated company.

         COMPENSATION - The amount you are paid by the Employer during the Plan
Year as wages, salary, overtime pay, bonuses, commissions, and all pre-tax
contributions made by the Employer on your behalf to this or any other plan, to
the extent not in excess of $160,000 (as adjusted by the Secretary of the
Treasury for changes in the cost of living). Indirect payments such as
(non-pre-tax) Employer contributions to this or any other plan, employee moving
expenses, and income derived from stock purchase plans or stock options are
excluded from Compensation.

         DISABLED - Your lasting inability, due to illness, accident, or other
mental or physical incapacity to perform the customary duties of your job.

         EARLY RETIREMENT DATE - The date on which a Participant has both (i)
attained age 55, and (ii) completed 6 Years of Service.

         EMPLOYER - Enforcer Products, Inc. and any affiliated company which is
authorized by NSI to adopt the Plan.

         EMPLOYER CONTRIBUTION ACCOUNTS - Collectively, your Matching
Contribution Account and your Profit Sharing Account.

         ERISA - The Employee Retirement Income Security Act of 1974, as
amended from time to time.

         FORFEITURE - The respective portions of both your Matching
Contribution Account and Profit Sharing Account in which you are not Vested at
the time you terminate employment and which are used to reduce the Employer's
Matching Contributions and/or Profit Sharing Contributions.



                                     -28-
<PAGE>   31
         HIGHLY COMPENSATED EMPLOYEE - An employee whose compensation is in
excess of $80,000 (as adjusted by the government from time to time for changes
in the cost of living).

         INVESCO - INVESCO Solutions, Inc., the recordkeeper for the Plan,
which also provides the Benefits Phone and assists in providing information
about your Plan Account.

         INVESTMENT COMMITTEE - The committee appointed by NSI which has the
authority to establish the Investment Funds under the Plan, to select the
investment advisors, and to manage and maintain the investment activities of
the Plan.

         INVESTMENT FUNDS - The investment options under the Plan among which a
Participant may direct the investment of his Account.

         MATCHING CONTRIBUTIONS - The contributions made by the Employer to
match your Pre-Tax Contributions.

         MATCHING CONTRIBUTION ACCOUNT - The account to which the Matching
Contributions made on your behalf are credited.

         NORMAL RETIREMENT DATE - The date on which a Participant attains age
65.

         NSI - National Service Industries, Inc.

         NSI COMMON STOCK - The common stock of National Service Industries,
Inc., $1.00 par value.

         PARTICIPANT - An employee or former employee who has begun
participating in the Plan and whose Plan Account has not yet been fully paid to
him or her.

         PLAN - Enforcer Products 401(k) Plan, as set forth
herein and as amended and/or restated from time to time.

         PLAN ADMINISTRATOR - NSI, or any person, group, or entity appointed by
NSI to administer the Plan.

         PLAN YEAR - January 1 through December 31.

         PRE-TAX ACCOUNT - The account to which your Pre-Tax Contributions are
credited.

         PRE-TAX CONTRIBUTIONS - The contributions you make to the Plan on a
pre-tax basis, via payroll deduction.

         PROFIT SHARING ACCOUNT - The account to which any Profit Sharing
Contributions made on your behalf are credited.



                                     -29-
<PAGE>   32

         PROFIT SHARING CONTRIBUTIONS - The contributions made by the Employer
(at its discretion) to the Profit Sharing Accounts of Participants.

         ROLLOVER ACCOUNT - The account to which any rollover contributions are
credited.

         ROLLOVER CONTRIBUTIONS - Any amounts transferred by (or for) you to
your Plan Account from another tax-qualified retirement plan.

         VESTED or VESTED INTEREST - The portion of your Account which is
non-forfeitable.

         YEAR OF SERVICE - A Plan Year in which you complete 1,000 or more
Hours of Service for the Employer or an affiliated company. Your Years of
Service will be determined starting with the Plan Year during which you
commence employment.



                                     -30-
<PAGE>   33

                  INVESTMENT FUNDS AND INVESTMENT PERFORMANCE

                  This section provides additional information relating to the
Investment Funds available under the Plan and an indication of the performance
history of the Funds (or similarly managed investment vehicles). This material
should be read in conjunction with the information in Questions 9 through 13 of
this booklet.

INVESTMENT FUNDS

         Stable Value Fund

                  The Stable Value Fund is designed to preserve principal value
while providing consistently high levels of current income and liquidity.
Because interest rates paid in the market for short term investments change
over time, the returns from the fund will also fluctuate. But, unlike stocks
and bonds whose principal values go up and down, the Fund is designed to
provide a stable principal value.

                  The Stable Value Fund is managed by PRIMCO Capital
Management, an affiliate of INVESCO. PRIMCO is one of the largest managers of
stable value funds in the United States, with over $15 billion in assets under
management. The Stable Value Fund will be a separately managed account for
participants in various plans sponsored by NSI.

                  The Fund invests in a diversified portfolio of investment
contracts with insurance companies, banks, or other financial institutions. It
may also invest in short-term securities such as commercial paper and
certificates of deposit. Additionally, the Fund may invest in other fixed
income securities such as bonds.

                  An investment contract is an agreement with an insurance
company, bank or other financial institution that promises a specific rate of
return for a period of time. The quality of the promise is based on the
financial health of the issuing entity. Some contracts are enhanced by
high-quality marketable securities.

                  Each investment is researched by the manager to ensure that
it fits within the investment criteria. Every investment must have a minimum
quality rating of AA-. As an additional quality control, the amount and the
maturity of investment is determined by the quality rating. The lower the
rating, the shorter the maturity of the investment and the smaller the amount
of the portfolio that can be committed to the investment. Finally, the
portfolio is structured in such a way that there is minimal risk of fluctuation
of principal balances on a quarterly basis.

                  The overall portfolio will have an average quality rating of
AA+. The average maturity of the Fund is to remain under 3 years.



                                     -31-
<PAGE>   34

                  The Stable Value Fund is operated as a "no-load" fund,
meaning there are no fees to invest in, or transfer out of, the Fund. The Fund
will pay PRIMCO an annual management fee not to exceed 0.15% of average net
assets.

         The Balanced Fund

                  The Balanced Fund is a balanced portfolio of stocks and
high-quality fixed income securities (primarily bonds). The Balanced Fund is
managed by INVESCO Capital Management ("INVESCO Capital"), an affiliate of
INVESCO and an internationally recognized investment management firm managing
over $260 billion around the world. The assets of the balanced fund are
invested in a commingled fund. Only employee benefit trusts qualified under
Section 401 of the Code are eligible to invest in this INVESCO Capital Fund.

                  The investment objective of the Balanced Fund is to achieve a
high total return on investment through capital appreciation and current
income, while reducing risk through diversification. Funds having an investment
objective of seeking a high total return may be limited in their ability to
obtain their objective due to limitations on the types of securities in which
they may invest. Therefore, no assurance can be given that the Fund will be
able to achieve its investment objective.

                  No more than 70% of the Fund's assets can be invested in
either stocks or bonds. The portfolio manager employs a tactical asset
allocation strategy to determine the appropriate mix between stocks and bonds
based upon current market conditions. The manager will use measures of current
market conditions to control risk by decreasing or increasing the equity
exposure within the allowable ranges.

                  The Fund will have a minimum exposure to stocks and bonds of
30% each. The remaining 40% is adjusted between stocks and bonds based on
current market conditions versus historical norms. The principal measure used
to make this decision is the yield relationship between INVESCO Capital's stock
universe and the 20-year Treasury bond. When the current relationship is in
line with the historical norms, the portfolio's asset allocation is 60% in
stocks and 40% in bonds. As the yield spread widens, stocks are emphasized; as
it narrows, bonds are emphasized.

                  The stock portion of the portfolio focuses on the top 800
stocks on the New York Stock Exchange that have at least ten years of financial
history. These stocks are subject to computer analysis to identify the top 250
companies that most effectively utilize their capital. This analysis is based
on a proprietary model developed by INVESCO Capital.

                  Once the top 250 companies are identified, they are subjected
to fundamental analysis by the portfolio managers. In this analysis, the
manager seeks to identify those firms that are attractively priced, and those
that appear likely to continue to perform in line with their historical
financial patterns. This list is reduced to 100 stocks that the manager can use
to build the stock portion of the portfolio. The manager typically holds
between 40-50 stocks in the account.



                                     -32-
<PAGE>   35

                  The fixed income portion of the portfolio can invest in
investment-grade bonds. The account is typically invested in intermediate (3-5
year average maturity) U.S. Government bonds. This fund may at times hold some
investment-grade corporate bonds when the current yield on corporate bonds is
sufficiently above U.S. Government securities to merit the additional risks. As
with the asset allocation and equity decision, all fixed income decisions are
based on current market conditions. No forecasting of interest rates is
utilized.

                  The Balanced Fund is operated as a "no-load" fund, meaning
there are no fees to invest in, or transfer out of, the Fund. The Fund will pay
INVESCO Capital an annual management fee of 0.60% of the first $25 million of
the Fund's average net assets and 0.25% on the Fund's average net assets above
$25 million.

                  The Balanced Fund is described in a prospectus provided by
the offeror of such fund, and you may obtain a copy upon request.

         Diversified Equity Fund

                  The investment objective of the Diversified Equity Fund is to
achieve above average total return, consisting of capital appreciation and
income. Amounts directed to the Diversified Equity Fund will be invested by the
Plan in the John Hancock Independence Diversified Core Equity Fund ("John
Hancock Fund"), an investment fund for institutional investors such as the
Plan. The investment manager for the John Hancock Fund is Independence
Investment Associates, Inc., an affiliate of John Hancock Life Insurance
Company.

                  The Fund will diversify its investments to create a portfolio
with a risk profile and characteristics similar to the Standard & Poor's 500
Stock Index. Consequently, the Fund will invest in a number of industry groups
without concentration in any particular industry. The Fund's investments will
be subject to the market fluctuation and risks inherent in all securities.
There can be no assurance that the Fund will achieve its objective.

                  Under normal conditions, the Fund invests approximately 90%
of its total assets in common stocks. On average, the Fund's investment in
common stocks will exceed 90% of its total assets. The Fund will focus on
securities of companies which the Fund's management believes offer outstanding
capital growth and/or income potential over both the intermediate and long
term. The Fund's management considers stocks which combine value and improving
fundamentals to be attractive investments for the Fund. In determining what
constitutes "value," the Fund's management seeks stocks with the following
attributes: high growth relative to price/earnings ratio, rising dividend
stream, and high asset value. To determine whether a company's stock exhibits
improving fundamentals, the Fund's management looks for accelerating earnings
growth, positive earnings surprises when compared to the market's expectations
and favorable cyclical timing.

                  The Fund may invest in the securities of foreign issuers in
the form of American Depository Receipts (ADRs). ADRs (sponsored and
unsponsored) are receipts, typically issued by U.S. banks, which evidence
ownership of underlying securities issued by a foreign



                                     -33-
<PAGE>   36

corporation. An investment in foreign securities including ADRs may be affected
by changes in currency rates and in exchange control regulations.

                  The Fund may also invest in fixed-income securities. All
fixed income securities purchased by the Fund, however, must be rated A or
better by Moody's Investors Service, Inc. or Standard and Poor's Corporation
or, if unrated, determined to be of comparable quality by the Fund's Adviser.

                  The Fund is operated as a "no-load" fund, meaning there are
no fees to invest in, or transfer out of, the Fund. The Fund pays a monthly fee
to the Adviser for managing the Fund's investment and business affairs, which
is equal on an annual basis to 0.50% of the Fund's average daily net assets.
The Fund pays fees to its independent Trustees, the expenses of the continuing
registration and qualification of its shares for sale, the charges of
custodians and transfer agents, and auditing and legal expenses. The Adviser
may, from time to time, agree that all or a portion of its fee will not be
imposed for specific periods or make other arrangements to limit the Fund's
expenses to not more than a specified percentage of average net assets. The
Adviser retains the right to impose such fees and recover any other payments to
the extent annual expenses fall below the limit at the end of the fiscal year.
Currently, the Adviser has voluntarily agreed to limit the Fund's total annual
expenses until further notice to 0.70% of the Fund's average net assets.

                  The Fund has adopted a distribution plan under Rule 12b-1
under the Investment Company Act of 1940, but payment of fees under the plan
has been suspended until further notice is given to shareholders. The Fund does
not intend to activate the distribution plan payments in the immediate future.

                  The John Hancock Fund is described in a prospectus provided
by the offeror of such fund and you may obtain a copy upon request.

         NSI Stock Fund

                  This Fund will invest primarily in NSI Common Stock. Because
the Fund will only hold one stock, it lacks diversification and may be subject
to higher risks and greater fluctuation than a diversified portfolio. You may
not direct that more than 50% of your Account be invested in this Fund.

                  Shares of NSI Common Stock will be purchased in the open
market in privately negotiated transactions, or from NSI at prices not in
excess of the fair market value of the NSI Common Stock on the date of
purchase. All dividends received will be reinvested in the Fund. Sales of
shares will also be made in the open market, in privately negotiated
transactions or, under certain circumstances, to NSI. The Trustee, or the agent
designated to acquire or sell shares, may limit the daily volume of purchases
and sales to the extent it believes it will be in the interest of the Fund to
do so.

                  With respect to these purchases and sales, the cost charged
or proceeds credited to each affected Participant's Account shall be the
average cost for all shares purchased or sold



                                     -34-
<PAGE>   37

under the Plan during a period elected by the Plan Administrator or its
designee. Brokerage commissions, transfer taxes and other expenses, if any,
shall be included in the cost or subtracted from the gross proceeds of
purchases or sales of NSI Common Stock. There are no separate fees to invest
in, or transfer out of, this Fund and this Fund has no separate management fee.

                  Any NSI Common Stock received by the Trustee as a stock split
or dividend, or as a result of a reorganization or other recapitalization of
NSI, shall be allocated to each Participant's Account in the same manner as the
NSI Common Stock to which it is attributable has been allocated. Any rights to
subscribe to additional shares of NSI Common Stock shall be sold by the
Trustee, and the proceeds from the sale of any such rights shall be used to
purchase additional shares of NSI Common Stock, which additional shares shall
be allocated to each Participant's Account in the same manner as the NSI Common
Stock has been allocated.

                  With regard to shares of NSI Common Stock distributed to
Participants, persons who are not "affiliates" of NSI may freely resell such
stock. Resales of NSI Common Stock by persons who may be considered
"affiliates" of NSI, which may include executive officers, directors and 10%
shareholders, may be made only in compliance with all of the provisions of Rule
144, promulgated under the Securities Act of 1933, other than the one-year
holding period requirement, or pursuant to a registration statement for the
sale of such shares. In general, with respect to shares acquired by affiliates
pursuant to the Plan, under Rule 144 an affiliate (and persons whose shares are
aggregated with such affiliate) is entitled to sell within any three-month
period a number of shares (including shares received other than pursuant to the
Plan) that does not exceed the greater of one percent of the then outstanding
shares of NSI's Common Stock or the average weekly trading volume of such stock
on the New York Stock Exchange during the four calendar weeks preceding the
sale.

                  International Fund

                  The investment objective of the International Fund is to 
achieve long-term growth of capital. The International Fund is managed by
Templeton Investment Counsel, Inc.

                  The Fund seeks to achieve long-term capital growth through a 
flexible policy of investing in equity securities and debt obligations of
companies and governments outside the U.S. The Fund will invest at least 65% of
its total assets in foreign equity securities, and may also invest up to 35% of
its total assets in debt securities when, in the judgment of the investment
manager, the capital appreciation available through such investment outweighs
the potential for capital growth through investment in stocks. In selecting
securities for the Fund, the investment manager attempts to identify those
companies in various countries and industries where economic and political
factors, including currency movements, are likely to produce above-average
opportunities for capital appreciation. The Fund may invest up to 5% of its
assets and warrants (excluding warrants acquired in units or attached to
securities), and up to 10% of its assets in illiquid securities. The Fund will
not invest more than 5% of its total assets in any of the following: (i) debt
securities rated lower than BBB by S&P or Baa by Moody's, (ii) structured
investments, and (iii) securities of Russian issuers. The Fund may borrow up to
one-third of the value of its total assets and may lend portfolio securities
with an aggregate market



                                     -35-
<PAGE>   38

value of up to one-third of its total assets. The Fund may purchase and sell
put and call options on securities or indices, provided that (i) the value of
the underlying securities on which options may be written at any one time will
not exceed 25% of the Fund's total assets, and (ii) the Fund will not purchase
put or call options if the aggregate premium paid for such options would exceed
5% of its total assets. The Fund may enter into forward foreign currency
contracts and may purchase and write put and call options on foreign
currencies. For hedging purposes only, the Fund may buy and sell financial
futures contracts, stock index futures contracts, foreign currency futures
contracts and options on any of these futures contracts, provided that (i) the
Fund will not commit more than 5% of its total assets to initial margin
deposits on future contracts and related options, and (ii) the value of the
underlying securities on which futures contracts will be written at any one
time will not exceed 25% of the total assets of the Fund.

                  The Fund's investments are subject to market fluctuation and 
risks inherent in all securities. There can be no assurance that the Fund will
achieve its objectives.

                  The Fund is operated as a "no-load" mutual fund, meaning there
are no fees to invest in, or transfer out of, the Fund. The Fund pays a fee to
its investment manager for managing the Fund's investment and business affairs,
as well as the operating expenses of the Fund. For the fiscal year ending
December 31, 1997, the Fund paid management fees equal to .70% of average net
assets; the total operating expenses including management fees equaled .84% of
average net assets.

                  The International Fund is described in a prospectus provided 
by the offeror of such fund, and you may obtain a copy upon request.

                  Small Company Growth

                  The investment objective of the Small Company Growth Fund is
to achieve long-term capital growth. The Small Company Growth Fund is managed by
INVESCO Funds Group, Inc., a wholly owned subsidiary of AMVESCAP PLC., an
internationally recognized investment management firm managing over $260 billion
around the world.

                  The Fund will invest 65% or more of its assets in equity 
securities of companies with market capitalizations of one billion dollars or
less at the time of purchase ("Small Cap Companies"). The balance of the Fund's
assets may be invested in the equity securities of companies with market
capitalizations in excess of one billion dollars, debt securities and short-term
investments. The Fund's investments in debt securities include U.S. government
and corporate debt securities. The short term investments of the Fund (used to
meet current cash requirements, such as to satisfy requests to redeem shares
from the Fund) may consist of U.S. government and agency securities, domestic
banks' certificates of deposit and bankers' acceptances and commercial paper.

                  When investing in Small Cap Companies, the Fund primarily 
looks for companies in the developing stages of their life cycle, which are
undervalued in the marketplace, have earning which may be expected to grow
faster than the U.S. economy in general, and/or offer the



                                     -36-
<PAGE>   39

potential for accelerated earnings growth due to rapid growth of sales, new
products, management changes or structural changes in the economy. The Fund is
actively traded. Because the Fund's strategy highlights many short-term factors
- - current information about a company, investor interest, price movements of
the company's securities and general market and monetary conditions -
securities may be bought and sold relatively frequently, the Fund's portfolio
turnover may be higher than many other mutual Funds, sometimes exceeding 200%.

                  The Fund's investments are subject to market fluctuation and 
risks inherent in all securities. There is no assurance that the Fund's
investment objective will be met.

                  The Fund is operated as a "no-load" mutual fund, meaning there
are no fees to invest in, or transfer out of, the Fund. The Fund will pay
INVESCO a monthly management fee based upon a percentage of the Fund's average
net assets determined daily. The management fee is computed at the annual rate
of .75% on the first $350 million; .65% on the $350 million; and .55% on the
Fund's average net assets over $700 million. The Fund's expenses, which are
accrued daily, are deducted from total income before dividends are paid. Total
expenses of the Fund (prior to any expense offset arrangements) for the fiscal
year ended May 31, 1998, including investment advisory fees amounted to 1.48% of
the Fund's net assets. If necessary, certain Fund expenses will be absorbed
voluntarily by INVESCO in order to ensure that the Fund's total operating
expenses (after expense offset arrangements) will not exceed 1.5% of the Fund's
average net assets.

                  The Small Company Growth Fund is described in a prospectus 
provided by the offeror of such fund, and you may obtain a copy upon request.

                  S&P 500 Index

                  The investment objective of the S&P 500 Index Fund is to 
parallel the performance of the Standard and Poor's 500 Composite Stock Price
Index, which emphasizes stock of large U.S. companies. The S&P 500 Index Fund is
managed by Vanguard Group, a family of more than 30 investment companies with
more than 95 distinct investment portfolios and total net assets of more than
$360 billion.

                  The Fund employs a passively managed investment or index 
approach. The Fund holds each stock found in the S&P 500 Index in roughly the
same proportions as represented in the index itself. For example, if 5% of the
S&P 500 Index were made up of the assets of a specific company, the Fund would
invest the same percentage of its assets in that company.

                  The Fund's investments will be subject to market fluctuation 
and risks inherent in all securities. The Fund is also subject to objective
risk, which is the possibility that the returns from the S&P 500 Index will
trail returns from the overall stock market.

                  The Fund is operated as a "no-load" mutual fund, meaning that 
there are no fees to invest in, or transfer out of, the Fund. Expenses of the
Fund relating to investment advisory fees as well as fees for administering the
Fund, providing services, and other activities are deducted from the



                                     -37-
<PAGE>   40

Fund's income. The Fund's operating expenses for the fiscal year ending
December 31, 1997 was .19% of net assets.

                  The S&P 500 Index Fund is described in a prospectus provided 
by the offeror of such fund, and you may obtain a copy upon request.

                  Bond Index

                  The investment objective of the Bond Index Fund is to match to
total rate of return of the Lehman Brothers Aggregate Index during a calendar
year. The Bond Index Fund is managed by State Street Global Investors.

                  The Fund employs a passive bond indexing strategy. It seeks to
match the returns of the Lehman Brothers Aggregate Index by investing in a
well-diversified portfolio that is representative of the domestic investment
grade bond market. The Fund will invest in U.S. Treasury, agency, corporate,
mortgage-backed and asset-backed securities. Overall sector and quality ratings
are also matched to the index, with individual securities selection based upon
criteria generated by the Fund's credit research group, security availability,
and its impact on the portfolio's weightings.

                  The Fund is operated as an institutional commingled fund. 
Expenses of the Fund relating to investment advisory fees as well as fees for
administering the Fund, providing services and other activities are deducted
from the Fund's income. The Fund's operating expenses for the year ending
December 31, 1997 were .20% of net assets.

INVESTMENT PERFORMANCE

The following table reflects historical percentage gain (loss) if investments
had been made during such period in the Investment Funds (or in a similarly
managed fund or investment). The performance data represents past performance
and the results may not be indicative of future performance. The footnotes to
the table should be read in conjunction with the performance figures presented
for each Fund.

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------
                                             INVESTMENT GAIN (LOSS) PERCENTAGE
- -----------------------------------------------------------------------------------------------------------------------
                                                                                       SMALL        S&P 
               STABLE                  DIVERSIFIED       NSI                          COMPANY       500        BOND
               VALUE      BALANCED       EQUITY         STOCK       INTERNATIONAL      GROWTH       INDEX      INDEX
- -----------------------------------------------------------------------------------------------------------------------
    Year
- -----------------------------------------------------------------------------------------------------------------------
   <S>         <C>        <C>          <C>              <C>         <C>               <C>           <C>       <C>
    1998        6.41%      13.57%         30.16%       -21.13%          10.16%          14.90%      28.79%     8.84%
- -----------------------------------------------------------------------------------------------------------------------
    1997        6.80%      25.50%         29.40%        36.30%          11.43%          -7.08%      33.20%    12.07%
- -----------------------------------------------------------------------------------------------------------------------
    1996        6.90%      14.50%         19.90%        17.50%          21.58%          55.78%      23.10%       NA
- -----------------------------------------------------------------------------------------------------------------------
    1995        7.18%      29.85%         36.57%        31.29%          13.00%           4.98%      37.50%       NA
- -----------------------------------------------------------------------------------------------------------------------
    1994        7.80%       3.40%         -1.40%         4.30%           0.24%          15.34%       1.30%       NA
- -----------------------------------------------------------------------------------------------------------------------
    1993        5.80%       13.9%         16.80%         3.20%          34.03%          30.95%      10.00%       NA
- -----------------------------------------------------------------------------------------------------------------------
                                    ANNUAL COMPOUND RATES OF RETURN ENDING DECEMBER 31, 1997
- -----------------------------------------------------------------------------------------------------------------------
   3 Year       6.62%      17.69%         26.49%         7.67%          14.28%          14.91%      28.33%       NA
- -----------------------------------------------------------------------------------------------------------------------
   5 Year       6.95%      16.87%         22.02%          N/A           11.07%          13.69%      24.13%       NA
- -----------------------------------------------------------------------------------------------------------------------
</TABLE>



                                     -38-
<PAGE>   41

Stable Value - Numbers for years 1993-1998 represent performance of the INVESCO
Retirement Trust Stable Value Fund.

Balanced - Numbers represent the composite performance of the INVESCO
Retirement Trust Flex Fund and conform to standards set by the Association of
Investment Management Research, a non-profit organization that maintains
standards for professional investment advisers.

Diversified Equity - Numbers represent the composite performance of
Independence Investment Associates for all core diversified equity assets under
management and conform to standards set by the Association of Investment
Management Research, a non-profit organization that maintains standards for
professional investment advisers.

NSI Stock - Numbers represent the change in value, including dividends, of a
share of NSI stock for the appropriate years.

International - Numbers represent the total return of the Fund, including the
reinvestment of dividends and capital gains.

Small Company Growth - Numbers represent the total return of the Fund,
including the reinvestment of dividends and capital gains.

S&P 500 Index - Numbers represent the total return of the Fund, including the
reinvestment of dividends and capital gains.

Bond Index - Inception date of the Bond Index Fund was January 1, 1997.

Further information regarding performance, portfolio composition, etc. is
available upon request. All material is compiled from sources believed to be
reliable, but accuracy cannot be guaranteed.



                                     -39-

<PAGE>   1


                                                                      EXHIBIT 23

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



As independent public accountants, we hereby consent to the incorporation by
reference in this Registration Statement of our report dated October 9, 1998,
included in the Annual Report on Form 10-K of National Service Industries, Inc.
for the fiscal year ended August 31, 1998 and to all references to our firm
included in this Registration Statement.



                              s/Arthur Andersen LLP


Atlanta, Georgia
February 25, 1999
















                                       

<PAGE>   1
                                                                      EXHIBIT 24

                               POWER OF ATTORNEY



     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints DAVID LEVY and BROCK HATTOX, and each of them individually, his true
and lawful attorneys-in-fact (with full power of substitution and
resubstitution) to act for him in his name, place, and stead in his capacity as
a director or officer of National Service Industries, Inc., to execute and file
a Registration Statement on Form S-8 for the $1.00 par value National Service
Industries, Inc. Common Stock and plan interests to be offered in connection
with the Enforcer Products 401(k) Plan, and any and all amendments thereto, with
any exhibits thereto, and other documents in connection therewith, with the U.S.
Securities and Exchange Commission, granting unto said attorneys-in-fact, and
each of them individually, full power and authority to do and perform each and
every act and thing requisite and necessary to be done in the premises, as fully
to all intents and purposes as he might or could do in person, hereby ratifying
and confirming all that said attorneys-in-fact or either of them, or their
substitutes, may lawfully do or cause to be done by virtue hereof.




                                                    /s/ John L. Clendenin
                                           ------------------------------------
                                                       John L. Clendenin



Dated: January 6, 1999


<PAGE>   2

                               POWER OF ATTORNEY



     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints DAVID LEVY and BROCK HATTOX, and each of them individually, his true
and lawful attorneys-in-fact (with full power of substitution and
resubstitution) to act for him in his name, place, and stead in his capacity as
a director or officer of National Service Industries, Inc., to execute and file
a Registration Statement on Form S-8 for the $1.00 par value National Service
Industries, Inc. Common Stock and plan interests to be offered in connection
with the Enforcer Products 401(k) Plan, and any and all amendments thereto, with
any exhibits thereto, and other documents in connection therewith, with the U.S.
Securities and Exchange Commission, granting unto said attorneys-in-fact, and
each of them individually, full power and authority to do and perform each and
every act and thing requisite and necessary to be done in the premises, as fully
to all intents and purposes as he might or could do in person, hereby ratifying
and confirming all that said attorneys-in-fact or either of them, or their
substitutes, may lawfully do or cause to be done by virtue hereof.


                                              /s/ Thomas C. Gallagher
                                              ---------------------------------
                                                     Thomas C. Gallagher


Dated: January 6, 1999
<PAGE>   3

                               POWER OF ATTORNEY



     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes 
and appoints DAVID LEVY and BROCK HATTOX, and each of them individually, his 
true and lawful attorneys-in-fact (with full power of substitution and 
resubstitution) to act for him in his name, place, and stead in his capacity as 
a director or officer of National Service Industries, Inc., to execute and file 
a Registration Statement on Form S-8 for the $1.00 par value National Service 
Industries, Inc. Common Stock and plan interests to be offered in connection 
with the Enforcer Products 401(k) Plan, and any and all amendments thereto, 
with any exhibits thereto, and other documents in connection therewith, with 
the U.S. Securities and Exchange Commission, granting unto said 
attorneys-in-fact, and each of them individually, full power and authority to 
do and perform each and every act and thing requisite and necessary to be done 
in the premises, as fully to all intents and purposes as he might or could do 
in person, hereby ratifying and confirming all that said attorneys-in-fact or 
either of them, or their substitutes, may lawfully do or cause to be done by 
virtue hereof.



                                    /s/ Robert M. Holder, Jr.
                                    ----------------------------------
                                        Robert M. Holder, Jr.


Dated: January 6, 1999
<PAGE>   4
                               POWER OF ATTORNEY



     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints DAVID LEVY and BROCK HATTOX, and each of them individually, his true
and lawful attorneys-in-fact (with full power of substitution and
resubstitution) to act for him in his name, place, and stead in his capacity as
a director or officer of National Service Industries, Inc., to execute and file
a Registration Statement on Form S-8 for the $1.00 par value National Service
Industries, Inc. Common Stock and plan interests to be offered in connection
with the Enforcer Products 401(k) Plan, and any and all amendments thereto, with
any exhibits thereto, and other documents in connection therewith, with the U.S.
Securities and Exchange Commission, granting unto said attorneys-in-fact, and
each of them individually, full power and authority to do and perform each and
every act and thing requisite and necessary to be done in the premises, as fully
to all intents and purposes as he might or could do in person, hereby ratifying
and confirming all that said attorneys-in-fact or either of them, or their
substitutes, may lawfully do or cause to be done by virtue hereof.



                                             /s/ Charles W. McCall
                                             ----------------------------------
                                                 Charles W. McCall


Dated: January 6, 1999

<PAGE>   5

                               POWER OF ATTORNEY




     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints DAVID LEVY and BROCK HATTOX, and each of them individually, his true
and lawful attorneys-in-fact (with full power of substitution and
resubstitution) to act for him in his name, place, and stead in his capacity as
a director or officer of National Service Industries, Inc., to execute and file
a Registration Statement on Form S-8 for the $1.00 par value National Service
Industries, Inc. Common Stock and plan interests to be offered in connection
with the Enforcer Products 401(k) Plan, and any and all amendments thereto, with
any exhibits thereto, and other documents in connection therewith, with the U.S.
Securities and Exchange Commission, granting unto said attorneys-in-fact, and
each of them individually, full power and authority to do and perform each and
every act and thing requisite and necessary to be done in the premises, as fully
to all intents and purposes as he might or could do in person, hereby ratifying
and confirming all that said attorneys-in-fact or either of them, or their
substitutes, may lawfully do or cause to be done by virtue hereof.




                                      /s/  John G. Medlin, Jr.
                                      --------------------------
                                           John G. Medlin, Jr.



Dated: January 6, 1999
<PAGE>   6


                               POWER OF ATTORNEY




     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints DAVID LEVY and BROCK HATTOX, and each of them individually, his true
and lawful attorneys-in-fact (with full power of substitution and
resubstitution) to act for him in his name, place, and stead in his capacity as
a director or officer of National Service Industries, Inc., to execute and file
a Registration Statement on Form S-8 for the $1.00 par value National Service
Industries, Inc. Common Stock and plan interests to be offered in connection
with the Enforcer Products 401(k) Plan, and any and all amendments thereto, with
any exhibits thereto, and other documents in connection therewith, with the U.S.
Securities and Exchange Commission, granting unto said attorneys-in-fact, and
each of them individually, full power and authority to do and perform each and
every act and thing requisite and necessary to be done in the premises, as fully
to all intents and purposes as he might or could do in person, hereby ratifying
and confirming all that said attorneys-in-fact or either of them, or their
substitutes, may lawfully do or cause to be done by virtue hereof.


                                                    /s/ Sam Nunn
                                             ------------------------------
                                                        Sam Nunn
 

Dated: January 6, 1999
<PAGE>   7
                               POWER OF ATTORNEY



     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints DAVID LEVEY and BROCK HATTOX, and each of them individually, his true
and lawful attorneys-in-fact (with full power of substitution and
resubstitution) to act for him in his name, place, and stead in his capacity as
a director or officer of National Service Industries, Inc., to execute and file
a Registration Statement on Form S-8 for the $1.00 par value National Service
Industries, Inc. Common Stock and plan interests to be offered in connection
with the Enforcer Products 401(k) Plan, and any and all amendments thereto, with
any exhibits thereto, and other documents in connection therewith, with the U.S.
Securities and Exchange Commission, granting unto said attorneys-in-fact, and
each of them individually, full power and authority to do and perform each and
every act and thing requisite and necessary to be done in the premises, as fully
to all intents and purposes as he might or could do in person, hereby ratifying
and confirming all that said attorneys-in-fact or either of them, or their
substitutes, may lawfully do or cause to be done by virtue hereof.



                                                /s/  Herman J. Russell
                                                --------------------------
                                                     Herman J. Russell
 
Dated: January 6, 1999
<PAGE>   8

                               POWER OF ATTORNEY



     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes 
and appoints DAVID LEVY and BROCK HATTOX, and each of them individually, her
true and lawful attorneys-in-fact (with full power of substitution and
resubstitution) to act for her in her name, place, and stead in her capacity as
a director or officer of National Service Industries, Inc., to execute and file
a Registration Statement on Form S-8 for the $1.00 par value National Service
Industries, Inc. Common Stock and plan interests to be offered in connection
with the Enforcer Products 401(k) Plan, and any and all amendments thereto, with
any exhibits thereto, and other documents in connection therewith, with the U.S.
Securities and Exchange Commission, granting unto said attorneys-in-fact, and
each of them individually, full power and authority to do and perform each and
every act and thing requisite and necessary to be done in the premises, as fully
to all intents and purposes as she might or could do in person, hereby ratifying
and confirming all that said attorneys-in-fact or either of them, or their
substitutes, may lawfully do or cause to be done by virtue hereof.



                                                /s/  Betty L. Siegel
                                                --------------------------
                                                     Betty L. Siegel
 
Dated: January 6, 1999
<PAGE>   9

                               POWER OF ATTORNEY



     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes 
and appoints DAVID LEVY and BROCK HATTOX, and each of them individually, his 
true and lawful attorneys-in-fact (with full power of substitution and 
resubstitution) to act for him in his name, place, and stead in his capacity as 
a director or officer of National Service Industries, Inc., to execute and file 
a Registration Statement on Form S-8 for the $1.00 par value National Service 
Industries, Inc. Common Stock and plan interests to be offered in connection 
with the Enforcer Products 401(k) Plan, and any and all amendments thereto, 
with any exhibits thereto, and other documents in connection therewith, with 
the U.S. Securities and Exchange Commission, granting unto said 
attorneys-in-fact, and each of them individually, full power and authority to 
do and perform each and every act and thing requisite and necessary to be done 
in the premises, as fully to all intents and purposes as he might or could do 
in person, hereby ratifying and confirming all that said attorneys-in-fact or 
either of them, or their substitutes, may lawfully do or cause to be done by 
virtue hereof.

                                             /s/ Barrie A. Wigmore
                                             ----------------------------------
                                                       Barrie A. Wigmore

Dated: January 6, 1999


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