RATIONAL SOFTWARE CORP
S-8, 1997-04-24
PREPACKAGED SOFTWARE
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<PAGE>
 
          As filed with the Securities and Exchange Commission on April 24, 1997
                                                           Registration No. 333-

                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
                            ----------------------
 
                                   FORM S-8
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933
                            ---------------------- 
 
                         RATIONAL SOFTWARE CORPORATION
                         (FORMERLY VERDIX CORPORATION)
            (Exact name of Registrant as specified in its charter)
  
Delaware                                                          54-1217099
(State or other jurisdiction of                               (I.R.S. Employer
incorporation or organization)                           Identification Number)
 
                           ---------------------- 
                          2800 San Tomas Expressway 
                         Santa Clara, California 95051
                                (408) 496-3600
   (Address, including zip code, and telephone number, including area code,
                 of Registrant's principal executive offices)
                                  
 
                           ---------------------- 
 
               PERFORMANCE AWARENESS CORPORATION 1997 STOCK PLAN
                 RATIONAL SOFTWARE CORPORATION 1997 STOCK PLAN
                            (Full title of the Plan)
                           ---------------------- 

                                ROBERT T. BOND
                            SENIOR VICE PRESIDENT,
                           CHIEF OPERATING OFFICER,
                     CHIEF FINANCIAL OFFICER AND SECRETARY
                               RATIONAL SOFTWARE
                                  CORPORATION
                           2800 SAN TOMAS EXPRESSWAY
                        SANTA CLARA, CALIFORNIA  95051
                                (408) 496-3600
                      (Name, address, including zip code,
                     and telephone number, including area
                          code, of agent for service)
                           ---------------------- 

                                   Copy to:

                           Gail Clayton Husick, Esq.
                          Martin A. Wellington, Esq.
                       Wilson Sonsini Goodrich & Rosati
                           Professional Corporation
                              650 Page Mill Road
                              Palo Alto, CA 94304
                                (415) 493-9300
                           ---------------------- 

                        CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
========================================================================================================
                                                                 PROPOSED      PROPOSED
                                                                 MAXIMUM       MAXIMUM      
TITLE OF EACH CLASS                             AMOUNT           OFFERING     AGGREGATE       AMOUNT OF
OF SECURITIES TO                                TO BE             PRICE        OFFERING     REGISTRATION
BE REGISTERED                                 REGISTERED        PER SHARE(1)     PRICE         FEE(2)
- --------------------------------------------------------------------------------------------------------
<S>                                       <C>                  <C>            <C>          <C>
 
Common Stock, $.01 Par Value             
   Performance Awareness Corporation                       
   1997 Stock Plan                        250,000  shares      $  14.945      $3,736,250   $      1,133
 
   Rational Software Corporation          
   1997 Stock Plan                      3,058,229  shares(3)          --              --             --
   (previously registered under 
    Rational Software Corporation
    1994 Stock Option Plan) (3)
========================================================================================================
</TABLE>

(1) All options under the Performance Awareness Corporation 1997 Stock Plan are
    exercisable for shares of the Company's Common Stock at the exercise price
    of $14.945 per share.
(2) Rounded up to the nearest dollar.
(3) The Rational Software Corporation 1997 Stock Plan allows for the issuance of
    shares of Common Stock previously reserved and available under the Rational
    Software Corporation 1994 Stock Option Plan (the "1994 Plan Shares"). The
    Company registered 800,000 1994 Plan Shares on a Registration Statement on
    Form S-8 (File No. 333-22687) on March 4, 1997. In the future additional
    1994 Plan Shares may become available pursuant to option lapses,
    terminations and returns. For this reason the Company is registering hereon
    an additional 3,058,229 1994 Plan Shares which includes (i) all of the
    shares of common stock reserved under the 1994 Stock Option Plan either
    subject to currently outstanding options or rolled over to the 1997 Plan
    pursuant to option returns, lapses and expirations, (ii) less the 800,000
    shares registered on File No. 333-22687. All of the 1994 Plan Shares
    Registered hereon (and all of the 1994 Plan Shares registered on File No.
    333-22687) have been previously registered on a Registration Statement on
    Form S-8 (File No. 333-15015) and a registration fee was paid according to
    Rule 457(c) upon the filing of such registration statement. Accordingly, the
    1994 Plan Shares registered hereon are not included for the purpose
    calculating the registration fee.
===============================================================================
<PAGE>
 
                         RATIONAL SOFTWARE CORPORATION
                       REGISTRATION STATEMENT ON FORM S-8

                                    PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT


Item 3.  Incorporation of Documents by Reference.
         --------------------------------------- 

        There are hereby incorporated by reference in this Registration
Statement the following documents and information heretofore filed with the
Securities and Exchange Commission (the "Commission"):

          (a) The Registrant's Annual Report on Form 10-K for the year ended
March 31, 1996, as amended, filed with the Commission.

          (b) The Registrant's Quarterly Reports on Form 10-Q for the quarterly
periods ended June 30, 1996, September 30, 1996, and December 31, 1996, filed
with the Commission.

        The Registrant's Current Reports on Form 8-K dated October 2, 1996,
October 3, 1996, as amended, December 6, 1996, February 27, 1997, April 9, 1997,
and April 14, 1997 filed with the Commission.

          (c) The description of the Registrant's Common Stock contained in the
Registration Statement on Form S-4 (File No. 333-19669) initially filed by the
Registrant with the Commission on January 13, 1997, and any amendment or report
filed hereafter for the purpose of updating such description.

        Item 1 of Registrant's Form 8-A dated May 25, 1984 as amended on Form 8-
A/A dated May 25, 1995, filed with the Commission.

        The Company hereby incorporates by reference in this Registration
Statement the contents of the Company's Registration Statements on Form S-8
(Registration Nos. 33-77382, 33-85906, 33-97044, 333-15015, 333-15007 and 333-
22687).

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

Item 4.  Description of Securities.
         ------------------------- 

         Not applicable.

Item 5.  Interests of Named Experts and Counsel.
         -------------------------------------- 

         Not applicable.

                                      II-1
<PAGE>
 
Item 6.  Indemnification of Directors and Officers.
         ----------------------------------------- 

         Section 145 of the Delaware General Corporation Law authorizes a court
to award, or a corporation's Board of Directors to grant, indemnity to directors
and officers in terms sufficiently broad to permit such indemnification under
certain circumstances for liabilities (including reimbursement for expenses
incurred) arising under the Securities Act of 1933, as amended. The Registrant's
Certificate of Incorporation, as amended, and Bylaws, as amended provide for
indemnification of its officers, directors, employees and other agents to the
maximum extent permitted by the Delaware Law. In addition, the Registrant has
entered into Indemnification Agreements with its officers and directors.

Item 7.  Exemption from Registration Claims.
         ---------------------------------- 
 
         Not applicable.

 
Item 8.      Exhibits
             --------
 
        Exhibit      
        Number       Description
 
        4.1          Performance Awareness Corporation 1997 Stock Plan
        4.2          Rational Software Corporation 1997 Stock Plan is
                     incorporated herein by reference to the Registration
                     Statement on Form S-8 (File No. 333-22687) filed with the
                     Commission on March 4, 1997.
        5.1          Opinion of Wilson Sonsini Goodrich & Rosati, P.C. with
                     respect to the securities being registered
        23.1         Consent of Ernst & Young LLP, Independent Auditors
        23.2         Consent of Counsel (contained in Exhibit 5.1)
        24.1         Power of Attorney (see page II-4)

Item 9.  Undertakings
         ------------

        (a) Rule 415 Offering.  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.

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

        provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply
        --------  -------                                                       
if the registration statement is on Form S-3 ((S)239.13 of this chapter) or Form
S-8 ((S)239.16(b) of this chapter), and the information required to be included
in a post-effective amendment by those paragraphs is contained in periodic
reports filed by the

                                      II-2
<PAGE>
 
registrant pursuant to section 13 or section 15(d) of the Exchange Act
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.

        (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, each filing of the
Registrant's annual report pursuant to section 13(a) or section 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Exchange Act) 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 an initial bona
fide offering thereof.

     (c) Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the Delaware General Corporations Law, the Certificate of
Incorporation of the Registrant, the Bylaws of the Registrant, Indemnification
Agreements entered into between the Registrant and its officers and directors,
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 Securities 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 the controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the
Securities Act and will be governed by the final adjudication of such issue.

                                      II-3
<PAGE>
 
                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the Registrant
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 Santa Clara, State of California, on April 21, 1997.

                                       RATIONAL SOFTWARE CORPORATION



                                       By:  /s/ Robert T. Bond
                                            ------------------
                                       Robert T. Bond
                                       Senior Vice President, 
                                       Chief Operating Officer, 
                                       Chief Financial Officer and Secretary


                               POWER OF ATTORNEY

     KNOW ALL THESE PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Paul D. Levy and Robert T. Bond and each
of them, jointly and severally, his attorneys-in-fact, each with full power of
substitution, for him in any and all capacities, to sign any and all amendments
to this Registration Statement on Form S-8 and to file the same, with exhibits
thereto and other documents in connection therewith, with the Securities and
Exchange Commission, hereby ratifying and conforming all that each said
attorneys-in-fact or his substitute or substitutes, may do or cause to be done
by virtue hereof.

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

 
Date:  April 21, 1997        /s/ Michael T. Devlin
                             -----------------------------------------
                             Michael T. Devlin, President and Director
                             
                             
Date:  April 21, 1997        /s/ Paul D. Levy
                             -----------------------------------------
                             Paul D. Levy, Chairman of the Board
                             and Chief Executive Officer
                             
Date:  April 21, 1997        /s/ Robert T. Bond
                             -----------------------------------------
                             Robert T. Bond, Senior Vice
                             President, Chief Operating Officer,
                             Chief Financial Officer and Secretary
                             
Date:  April 21, 1997        /s/ James S. Campbell
                             -----------------------------------------
                             James S. Campbell, Director
                             
Date:  April 21, 1997        /s/ Daniel H. Case III
                             -----------------------------------------
                             Daniel H. Case III, Director
                             
Date:  April 21, 1997        /s/ Leslie G. Denend
                             -----------------------------------------
                             Leslie G. Denend, Director

                                      II-4
<PAGE>
 
Date:  April 21, 1997                    /s/ John E. Montague
                                         --------------------------------------
                                         John E. Montague, Director
 
Date:  April 21, 1997                    /s/ Allison R. Schleicher
                                         --------------------------------------
                                         Allison R. Schleicher, Director
 
Date:  April 21, 1997                    /s/ Timothy A. Brennan
                                         --------------------------------------
                                         Timothy A. Brennan, Vice President,
                                         Finance and Administration (Principal
                                         Accounting Officer)
 

                                      II-5

<PAGE>
 
                                                                     Exhibit 4.1
                                                                     -----------

                       PERFORMANCE AWARENESS CORPORATION
                                1997 STOCK PLAN


     1.   Purposes of the Plan.  The purposes of this Stock Plan are:
          --------------------                                       

          .   to attract and retain the best available personnel for positions
              of substantial responsibility,

          .   to provide additional incentive to Employees, Directors and
              Consultants, and

          .   to promote the success of the Company's business.

     Options granted under the Plan may be Incentive Stock Options or
Nonstatutory Stock Options, as determined by the Administrator at the time of
grant. Stock Purchase Rights may also be granted under the Plan.

     2.   Definitions.  As used herein, the following definitions shall apply:
          -----------                                                         

          (a)  "Administrator" means the Board or any of its Committees as shall
                -------------                                                   
be administering the Plan, in accordance with Section 4 of the Plan.

          (b)  "Applicable Laws" means the requirements relating to the
                ---------------                                        
administration of stock option plans under U. S. state corporate laws, U.S.
federal and state securities laws, the Code, any stock exchange or quotation
system on which the Common Stock is listed or quoted and the applicable laws of
any foreign country or jurisdiction where Options or Stock Purchase Rights are,
or will be, granted under the Plan.

          (c)  "Board" means the Board of Directors of the Company.
                -----                                              

          (d)  "Code" means the Internal Revenue Code of 1986, as amended.
                ----                                                      

          (e)  "Committee" means a committee of Directors appointed by the Board
                ---------                                                       
in accordance with Section 4 of the Plan.

          (f)  "Common Stock" means the common stock of the Company.
                ------------                                        

          (g)  "Company" means Performance Awareness Corporation, a North
                -------                                                  
Carolina corporation.

          (h)  "Consultant" means any person, including an advisor, engaged by
                ----------                                                    
the Company or a Parent or Subsidiary to render services to such entity.
<PAGE>
 
          (i)  "Director" means a member of the Board.
                --------                              

          (j)  "Disability" means total and permanent disability as defined in
                ----------                                                    
Section 22(e)(3) of the Code.

          (k)  "Employee" means any person, including Officers and Directors,
                --------                                                     
employed by the Company or any Parent or Subsidiary of the Company. A Service
Provider shall not cease to be an Employee in the case of (i) any leave of
absence approved by the Company or (ii) transfers between locations of the
Company or between the Company, its Parent, any Subsidiary, or any successor.
For purposes of Incentive Stock Options, no such leave may exceed ninety days,
unless reemployment upon expiration of such leave is guaranteed by statute or
contract. If reemployment upon expiration of a leave of absence approved by the
Company is not so guaranteed, on the 181st day of such leave any Incentive Stock
Option held by the Optionee shall cease to be treated as an Incentive Stock
Option and shall be treated for tax purposes as a Nonstatutory Stock Option.
Neither service as a Director nor payment of a director's fee by the Company
shall be sufficient to constitute "employment" by the Company.

          (l)  "Exchange Act" means the Securities Exchange Act of 1934, as
                ------------                                               
amended.

          (m)  "Fair Market Value" means, as of any date, the value of Common
                -----------------                                            
Stock determined as follows:

               (i) If the Common Stock is listed on any established stock
exchange or a national market system, including without limitation the Nasdaq
National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market, its
Fair Market Value shall be the closing sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such exchange or system for
the last market trading day prior to the time of determination, as reported in
The Wall Street Journal or such other source as the Administrator deems
reliable;

               (ii)  If the Common Stock is regularly quoted by a recognized
securities dealer but selling prices are not reported, the Fair Market Value of
a Share of Common Stock shall be the mean between the high bid and low asked
prices for the Common Stock on the last market trading day prior to the day of
determination, as reported in The Wall Street Journal or such other source as
the Administrator deems reliable; or

               (iii) In the absence of an established market for the Common
Stock, the Fair Market Value shall be determined in good faith by the
Administrator.

          (n)  "Incentive Stock Option" means an Option intended to qualify as
                ----------------------                                        
an incentive stock option within the meaning of Section 422 of the Code and the
regulations promulgated thereunder.

          (o)  "Nonstatutory Stock Option" means an Option not intended to
                -------------------------                                 
qualify as an Incentive Stock Option.

                                       2
<PAGE>
 
          (p)  "Notice of Grant" means a written or electronic notice evidencing
                ---------------                                                 
certain terms and conditions of an individual Option or Stock Purchase Right
grant. The Notice of Grant is part of the Option Agreement.

          (q)  "Officer" means a person who is an officer of the Company within
                -------                                                        
the meaning of Section 16 of the Exchange Act and the rules and regulations
promulgated thereunder.

          (r)  "Option" means a stock option granted pursuant to the Plan.
                ------                                                    

          (s)  "Option Agreement" means an agreement between the Company and an
                ----------------                                               
Optionee evidencing the terms and conditions of an individual Option grant. The
Option Agreement is subject to the terms and conditions of the Plan.

          (t)  "Option Exchange Program" means a program whereby outstanding
                -----------------------                                     
Options are surrendered in exchange for Options with a lower exercise price.

          (u)  "Optioned Stock" means the Common Stock subject to an Option or
                --------------                                                
Stock Purchase Right.

          (v)  "Optionee" means the holder of an outstanding Option or Stock
                --------                                                    
Purchase Right granted under the Plan.

          (w)  "Parent" means a "parent corporation," whether now or hereafter
                ------                                                        
existing, as defined in Section 424(e) of the Code.

          (x)  "Plan" means this 1997 Stock Option Plan.
                ----                                    

          (y)  "Restricted Stock" means shares of Common Stock acquired pursuant
                ----------------                                                
to a grant of Stock Purchase Rights under Section 11 of the Plan.

          (z)  "Restricted Stock Purchase Agreement" means a written agreement
                -----------------------------------                           
between the Company and the Optionee evidencing the terms and restrictions
applying to stock purchased under a Stock Purchase Right. The Restricted Stock
Purchase Agreement is subject to the terms and conditions of the Plan and the
Notice of Grant.

          (aa)  "Rule 16b-3" means Rule 16b-3 of the Exchange Act or any
                 ----------                                             
successor to Rule 16b-3, as in effect when discretion is being exercised with
respect to the Plan.

          (bb)  "Section 16(b)" means Section 16(b) of the Exchange Act.
                 -------------                                          

          (cc)  "Service Provider" means an Employee, Director or Consultant.
                 ----------------                                            

          (dd)  "Share" means a share of the Common Stock, as adjusted in
                 -----                                                   
accordance with Section 13 of the Plan.

                                       3
<PAGE>
 
          (ee)  "Stock Purchase Right" means the right to purchase Common Stock
                 --------------------                                          
pursuant to Section 11 of the Plan, as evidenced by a Notice of Grant.

          (ff)  "Subsidiary" means a "subsidiary corporation", whether now or
                 ----------                                                  
hereafter existing, as defined in Section 424(f) of the Code.

     3.   Stock Subject to the Plan. Subject to the provisions of Section 13 of
          -------------------------                                            
the Plan, the maximum aggregate number of Shares which may be optioned and sold
under the Plan is 250,000 Shares.

     If an Option or Stock Purchase Right expires or becomes unexercisable
without having been exercised in full, or is surrendered pursuant to an Option
Exchange Program, the unpurchased Shares which were subject thereto shall become
available for future grant or sale under the Plan (unless the Plan has
terminated); provided, however, that Shares that have actually been issued under
             --------                                                           
the Plan, whether upon exercise of an Option or Right, shall not be returned to
the Plan and shall not become available for future distribution under the Plan,
except that if Shares of Restricted Stock are repurchased by the Company at
their original purchase price, such Shares shall become available for future
grant under the Plan.

     4.   Administration of the Plan.
          -------------------------- 

          (a)  Procedure.
               --------- 

          (i)   Multiple Administrative Bodies.  The Plan may be administered by
                ------------------------------                                  
different Committees with respect to different groups of Service Providers.

          (ii)  Section 162(m).  To the extent that the Administrator determines
                --------------                                                  
it to be desirable to qualify Options granted hereunder as "performance-based
compensation" within the meaning of Section 162(m) of the Code, the Plan shall
be administered by a Committee of two or more "outside directors" within the
meaning of Section 162(m) of the Code.

          (iii) Rule 16b-3.  To the extent desirable to qualify transactions
                ----------                                     
hereunder as exempt under Rule 16b-3, the transactions contemplated hereunder
shall be structured to satisfy the requirements for exemption under Rule 16b-3.

          (iv)  Other Administration. Other than as provided above, the Plan
                --------------------                                        
shall be administered by (A) the Board or (B) a Committee, which committee shall
be constituted to satisfy Applicable Laws.

          (b)  Powers of the Administrator.  Subject to the provisions of the
               ---------------------------                                   
Plan, and in the case of a Committee, subject to the specific duties delegated
by the Board to such Committee, the Administrator shall have the authority, in
its discretion:

               (i)    to determine the Fair Market Value;

                                       4
<PAGE>
 
               (ii)   to select the Service Providers to whom Options and Stock
Purchase Rights may be granted hereunder;

               (iii)  to determine the number of shares of Common Stock to be
covered by each Option and Stock Purchase Right granted hereunder;

               (iv)   to approve forms of agreement for use under the Plan;

               (v)    to determine the terms and conditions, not inconsistent
with the terms of the Plan, of any Option or Stock Purchase Right granted
hereunder. Such terms and conditions include, but are not limited to, the
exercise price, the time or times when Options or Stock Purchase Rights may be
exercised (which may be based on performance criteria), any vesting acceleration
or waiver of forfeiture restrictions, and any restriction or limitation
regarding any Option or Stock Purchase Right of the shares of Common Stock
relating thereto, based in each case on such factors as the Administrator, in
its sole discretion, shall determine;

               (vi)   to reduce the exercise price of any Option or Stock
Purchase Right to the then current Fair Market Value if the Fair Market Value of
the Common Stock covered by such Option or Stock Purchase Right shall have
declined since the date the Option or Stock Purchase Right was granted;

               (vii)  to institute an Option Exchange Program;

               (viii) to construe and interpret the terms of the Plan and
awards granted pursuant to the Plan;

               (ix)   to prescribe, amend and rescind rules and regulations
relating to the Plan, including rules and regulations relating to sub-plans
established for the purpose of qualifying for preferred tax treatment under
foreign tax laws;

               (x)    to modify or amend each Option or Stock Purchase Right
(subject to Section 15(c) of the Plan), including the discretionary authority to
extend the post-termination exercisability period of Options longer than is
otherwise provided for in the Plan;

               (xi)   to allow Optionees to satisfy withholding tax obligations
by electing to have the Company withhold from the Shares to be issued upon
exercise of an Option or Stock Purchase Right that number of Shares having a
Fair Market Value equal to the amount required to be withheld. The Fair Market
Value of the Shares to be withheld shall be determined on the date that the
amount of tax to be withheld is to be determined. All elections by an Optionee
to have Shares withheld for this purpose shall be made in such form and under
such conditions as the Administrator may deem necessary or advisable;

               (xii)  to authorize any person to execute on behalf of the
Company any instrument required to effect the grant of an Option or Stock
Purchase Right previously granted by the Administrator;

                                       5
<PAGE>
 
               (xiii) to make all other determinations deemed necessary or
advisable for administering the Plan.

          (c)  Effect of Administrator's Decision. The Administrator's
               ----------------------------------                     
decisions, determinations and interpretations shall be final and binding on all
Optionees and any other holders of Options or Stock Purchase Rights.

     5.   Eligibility.  Nonstatutory Stock Options and Stock Purchase Rights may
          -----------                                                           
be granted to Service Providers. Incentive Stock Options may be granted only to
Employees.

     6.   Limitations.
          ------------

          (a)  Each Option shall be designated in the Option Agreement as either
an Incentive Stock Option or a Nonstatutory Stock Option. However,
notwithstanding such designation, to the extent that the aggregate Fair Market
Value of the Shares with respect to which Incentive Stock Options are
exercisable for the first time by the Optionee during any calendar year (under
all plans of the Company and any Parent or Subsidiary) exceeds $100,000, such
Options shall be treated as Nonstatutory Stock Options. For purposes of this
Section 6(a), Incentive Stock Options shall be taken into account in the order
in which they were granted. The Fair Market Value of the Shares shall be
determined as of the time the Option with respect to such Shares is granted.

          (b)  Neither the Plan nor any Option or Stock Purchase Right shall
confer upon an Optionee any right with respect to continuing the Optionee's
relationship as a Service Provider with the Company, nor shall they interfere in
any way with the Optionee's right or the Company's right to terminate such
relationship at any time, with or without cause.

          (c)  The following limitations shall apply to grants of Options:

               (i)   No Service Provider shall be granted, in any fiscal year of
the Company, Options to purchase more than 250,000 Shares (as appropriately
adjusted pursuant to Section 13(a) ("Changes in Capitalization") hereof.

               (ii)  In connection with his or her initial service, a Service
Provider may be granted Options to purchase up to an additional 250,000 Shares
which shall not count against the limit set forth in subsection (i) above (as
appropriately adjusted pursuant to Section 13(a) ("Changes in Capitalization")
hereof.

               (iii) The foregoing limitations shall be adjusted proportionately
in connection with any change in the Company's capitalization as described in
Section 13.

               (iv)  If an Option is cancelled in the same fiscal year of the
Company in which it was granted (other than in connection with a transaction
described in Section 13), the cancelled Option will be counted against the
limits set forth in subsections (i) and (ii) above. For this purpose, if the
exercise price of an Option is reduced, the transaction will be treated as a
cancellation of the Option and the grant of a new Option.

                                       6
<PAGE>
 
     7.   Term of Plan. Subject to Section 19 of the Plan, the Plan shall become
          ------------                                                          
effective upon its adoption by the Board. It shall continue in effect for a term
of ten (10) years unless terminated earlier under Section 15 of the Plan.

     8.   Term of Option.  The term of each Option shall be stated in the Option
          --------------                                                        
Agreement. In the case of an Incentive Stock Option, the term shall be ten (10)
years from the date of grant or such shorter term as may be provided in the
Option Agreement. Moreover, in the case of an Incentive Stock Option granted to
an Optionee who, at the time the Incentive Stock Option is granted, owns stock
representing more than ten percent (10%) of the total combined voting power of
all classes of stock of the Company or any Parent or Subsidiary, the term of the
Incentive Stock Option shall be five (5) years from the date of grant or such
shorter term as may be provided in the Option Agreement.

     9.   Option Exercise Price and Consideration.
          --------------------------------------- 

          (a)  Exercise Price. The per share exercise price for the Shares to be
               --------------                                                   
issued pursuant to exercise of an Option shall be determined by the
Administrator, subject to the following:

               (i)  In the case of an Incentive Stock Option

                    (A) granted to an Employee who, at the time the Incentive
Stock Option is granted, owns stock representing more than ten percent (10%) of
the voting power of all classes of stock of the Company or any Parent or
Subsidiary, the per Share exercise price shall be no less than 110% of the Fair
Market Value per Share on the date of grant.

                    (B) granted to any Employee other than an Employee described
in paragraph (A) immediately above, the per Share exercise price shall be no
less than 100% of the Fair Market Value per Share on the date of grant.

               (ii)  In the case of a Nonstatutory Stock Option, the per Share
exercise price shall be determined by the Administrator. In the case of a
Nonstatutory Stock Option intended to qualify as "performance-based
compensation" within the meaning of Section 162(m) of the Code, the per Share
exercise price shall be no less than 100% of the Fair Market Value per Share on
the date of grant.

               (iii) Notwithstanding the foregoing, Options may be granted
with a per Share exercise price of less than 100% of the Fair Market Value per
Share on the date of grant pursuant to a merger or other corporate transaction.

          (b)  Waiting Period and Exercise Dates.  At the time an Option is
               ---------------------------------                           
granted, the Administrator shall fix the period within which the Option may be
exercised and shall determine any conditions which must be satisfied before the
Option may be exercised.

          (c)  Form of Consideration.   The Administrator shall determine the
               ---------------------                                         
acceptable form of consideration for exercising an Option, including the method
of payment. In the case of an Incentive Stock Option, the Administrator shall
determine the acceptable form of consideration at the time of grant.  Such
consideration may consist entirely of:

                                       7
<PAGE>
 
               (i)    cash;

               (ii)   check;

               (iii)  promissory note;

               (iv)   other Shares which (A) in the case of Shares acquired upon
exercise of an option, have been owned by the Optionee for more than six months
on the date of surrender, and (B) have a Fair Market Value on the date of
surrender equal to the aggregate exercise price of the Shares as to which said
Option shall be exercised;

               (v)   consideration received by the Company under a cashless
exercise program implemented by the Company in connection with the Plan;

               (vi)   a reduction in the amount of any Company liability to the
Optionee, including any liability attributable to the Optionee's participation
in any Company-sponsored deferred compensation program or arrangement;

               (vii)  any combination of the foregoing methods of payment; or

               (viii) such other consideration and method of payment for the
issuance of Shares to the extent permitted by Applicable Laws.

     10.  Exercise of Option.
          -------------------

          (a)  Procedure for Exercise: Rights as a Shareholder.  Any Option
               -----------------------------------------------             
granted hereunder shall be exercisable according to the terms of the Plan and at
such times and under such conditions as determined by the Administrator and set
forth in the Option Agreement. Unless the Administrator provides otherwise,
vesting of Options granted hereunder shall be tolled during any unpaid leave of
absence. An Option may not be exercised for a fraction of a Share.

     An Option shall be deemed exercised when the Company receives: (i) written
or electronic notice of exercise (in accordance with the Option Agreement) from
the person entitled to exercise the Option, and (ii) full payment for the Shares
with respect to which the Option is exercised. Full payment may consist of any
consideration and method of payment authorized by the Administrator and
permitted by the Option Agreement and the Plan. Shares issued upon exercise of
an Option shall be issued in the name of the Optionee or, if requested by the
Optionee, in the name of the Optionee and his or her spouse. Until the Shares
are issued (as evidenced by the appropriate entry on the books of the Company or
of a duly authorized transfer agent of the Company), no right to vote or receive
dividends or any other rights as a shareholder shall exist with respect to the
Optioned Stock, notwithstanding the exercise of the Option. The Company shall
issue (or cause to be issued) such Shares promptly after the Option is
exercised. No adjustment will be made for a dividend or other right for which
the record date is prior to the date the Shares are issued, except as provided
in Section 13 of the Plan.

                                       8
<PAGE>
 
     Exercising an Option in any manner shall decrease the number of Shares
thereafter available, both for purposes of the Plan and for sale under the
Option, by the number of Shares as to which the Option is exercised.

          (b)  Termination of Relationship as a Service Provider.  If an
               -------------------------------------------------        
Optionee ceases to be a Service Provider, other than upon the Optionee's death
or Disability, the Optionee may exercise his or her Option within such period of
time as is specified in the Option Agreement to the extent that the Option is
vested on the date of termination (but in no event later than the expiration of
the term of such Option as set forth in the Option Agreement). In the absence of
a specified time in the Option Agreement, the Option shall remain exercisable
for three (3) months following the Optionee's termination. If, on the date of
termination, the Optionee is not vested as to his or her entire Option, the
Shares covered by the unvested portion of the Option shall revert to the Plan.
If, after termination, the Optionee does not exercise his or her Option within
the time specified by the Administrator, the Option shall terminate, and the
Shares covered by such Option shall revert to the Plan.

          (c)  Disability of Optionee. If an Optionee ceases to be a Service
               ----------------------                                       
Provider as a result of the Optionee's Disability, the Optionee may exercise his
or her Option within such period of time as is specified in the Option Agreement
to the extent the Option is vested on the date of termination (but in no event
later than the expiration of the term of such Option as set forth in the Option
Agreement). In the absence of a specified time in the Option Agreement, the
Option shall remain exercisable for twelve (12) months following the Optionee's
termination. If, on the date of termination, the Optionee is not vested as to
his or her entire Option, the Shares covered by the unvested portion of the
Option shall revert to the Plan. If, after termination, the Optionee does not
exercise his or her Option within the time specified herein, the Option shall
terminate, and the Shares covered by such Option shall revert to the Plan.

          (d)  Death of Optionee.  If an Optionee dies while a Service Provider,
               -----------------                                                
the Option may be exercised within such period of time as is specified in the
Option Agreement (but in no event later than the expiration of the term of such
Option as set forth in the Notice of Grant), by the Optionee's estate or by a
person who acquires the right to exercise the Option by bequest or inheritance,
but only to the extent that the Option is vested on the date of death. In the
absence of a specified time in the Option Agreement, the Option shall remain
exercisable for twelve (12) months following the Optionee's date of death. If,
at the time of death, the Optionee is not vested as to his or her entire Option,
the Shares covered by the unvested portion of the Option shall immediately
revert to the Plan. The Option may be exercised by the executor or administrator
of the Optionee's estate or, if none, by the person(s) entitled to exercise the
Option under the Optionee's will or the laws of descent or distribution. If the
Option is not so exercised within the time specified herein, the Option shall
terminate, and the Shares covered by such Option shall revert to the Plan.

          (e)  Buyout Provisions. The Administrator may at any time offer to buy
               -----------------                                                
out for a payment in cash or Shares an Option previously granted based on such
terms and conditions as the Administrator shall establish and communicate to the
Optionee at the time that such offer is made.

     11.  Stock Purchase Rights.
          --------------------- 

                                       9
<PAGE>
 
          (a)  Rights to Purchase.  Stock Purchase Rights may be issued either
               ------------------                                             
alone, in addition to, or in tandem with other awards granted under the Plan
and/or cash awards made outside of the Plan. After the Administrator determines
that it will offer Stock Purchase Rights under the Plan, it shall advise the
offeree in writing or electronically, by means of a Notice of Grant, of the
terms, conditions and restrictions related to the offer, including the number of
Shares that the offeree shall be entitled to purchase, the price to be paid, and
the time within which the offeree must accept such offer. The offer shall be
accepted by execution of a Restricted Stock Purchase Agreement in the form
determined by the Administrator.

          (b)  Repurchase Option. Unless the Administrator determines otherwise,
               -----------------                                                
the Restricted Stock Purchase Agreement shall grant the Company a repurchase
option exercisable upon the voluntary or involuntary termination of the
purchaser's service with the Company for any reason (including death or
Disability). The purchase price for Shares repurchased pursuant to the
Restricted Stock Purchase Agreement shall be the original price paid by the
purchaser and may be paid by cancellation of any indebtedness of the purchaser
to the Company. The repurchase option shall lapse at a rate determined by the
Administrator.

          (c)  Other Provisions.  The Restricted Stock Purchase Agreement shall
               ----------------                                                
contain such other terms, provisions and conditions not inconsistent with the
Plan as may be determined by the Administrator in its sole discretion.

          (d)  Rights as a Shareholder.  Once the Stock Purchase Right is
               -----------------------                                   
exercised, the purchaser shall have the rights equivalent to those of a
shareholder, and shall be a shareholder when his or her purchase is entered upon
the records of the duly authorized transfer agent of the Company. No adjustment
will be made for a dividend or other right for which the record date is prior to
the date the Stock Purchase Right is exercised, except as provided in Section 13
of the Plan.

     12.  Non-Transferability of Options and Stock Purchase Rights. Unless
          --------------------------------------------------------        
determined otherwise by the Administrator, an Option or Stock Purchase Right may
not be sold, pledged, assigned, hypothecated, transferred, or disposed of in any
manner other than by will or by the laws of descent or distribution and may be
exercised, during the lifetime of the Optionee, only by the Optionee. If the
Administrator makes an Option or Stock Purchase Right transferable, such Option
or Stock Purchase Right shall contain such additional terms and conditions as
the Administrator deems appropriate.

     13.  Adjustments Upon Changes in Capitalization, Dissolution, Merger or
          ------------------------------------------------------------------
Asset Sale.
- ---------- 

          (a)  Changes in Capitalization.  Subject to any required action by the
               -------------------------                                        
shareholders of the Company, the number of shares of Common Stock covered by
each outstanding Option and Stock Purchase Right, and the number of shares of
Common Stock which have been authorized for issuance under the Plan but as to
which no Options or Stock Purchase Rights have yet been granted or which have
been returned to the Plan upon cancellation or expiration of an Option or Stock
Purchase Right, as well as the price per share of Common Stock covered by each
such outstanding Option or Stock Purchase Right and the limitations on issuance
as set forth in Sections 6(c)(i) and 6(c)(ii) hereof, shall be proportionately
adjusted for any increase or decrease in the number of issued shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the

                                       10
<PAGE>
 
Common Stock, or any other increase or decrease in the number of issued shares
of Common Stock effected without receipt of consideration by the Company;
                                                                         
provided, however, that conversion of any convertible securities of the Company
- --------  -------                                                              
shall not be deemed to have been "effected without receipt of consideration."
Such adjustment shall be made by the Board, whose determination in that respect
shall be final, binding and conclusive. Except as expressly provided herein, no
issuance by the Company of shares of stock of any class, or securities
convertible into shares of stock of any class, shall affect, and no adjustment
by reason thereof shall be made with respect to, the number or price of shares
of Common Stock subject to an Option or Stock Purchase Right.

          (b)  Dissolution or Liquidation. In the event of the proposed
               --------------------------                              
dissolution or liquidation of the Company, the Administrator shall notify each
Optionee as soon as practicable prior to the effective date of such proposed
transaction. The Administrator in its discretion may provide for an Optionee to
have the right to exercise his or her Option until ten (10) days prior to such
transaction as to all of the Optioned Stock covered thereby, including Shares as
to which the Option would not otherwise be exercisable. In addition, the
Administrator may provide that any Company repurchase option applicable to any
Shares purchased upon exercise of an Option or Stock Purchase Right shall lapse
as to all such Shares, provided the proposed dissolution or liquidation takes
place at the time and in the manner contemplated. To the extent it has not been
previously exercised, an Option or Stock Purchase Right will terminate
immediately prior to the consummation of such proposed action.

          (c)  Merger, Sale or Exchange of Stock or Asset Sale.  In the event of
               -----------------------------------------------                  
a merger of the Company with or into another corporation, the sale or exchange
of substantially all the outstanding capital stock to or with a third party, or
the sale of substantially all of the assets of the Company, each outstanding
Option and Stock Purchase Right shall be assumed or an equivalent option or
right substituted by the successor corporation or a Parent or Subsidiary of the
successor corporation. In the event that the successor corporation refuses to
assume or substitute for the Option or Stock Purchase Right, the Optionee shall
fully vest in and have the right to exercise the Option or Stock Purchase Right
as to all of the Optioned Stock, including Shares as to which it would not
otherwise be vested or exercisable. If an Option or Stock Purchase Right becomes
fully vested and exercisable in lieu of assumption or substitution in the event
of a merger or sale of assets, the Administrator shall notify the Optionee in
writing or electronically that the Option or Stock Purchase Right shall be fully
vested and exercisable for a period of fifteen (15) days from the date of such
notice, and the Option or Stock Purchase Right shall terminate upon the
expiration of such period.  For the purposes of this paragraph, the Option or
Stock Purchase Right shall be considered assumed if, following the merger, sale
or exchange of capital stock or sale of assets, the option or right confers the
right to purchase or receive, for each Share of Optioned Stock subject to the
Option or Stock Purchase Right immediately prior to the merger or sale of
assets, the consideration (whether stock, cash, or other securities or property)
received in the merger, sale or exchange of capital stock or sale of assets by
holders of Common Stock for each Share held on the effective date of the
transaction (and if holders were offered a choice of consideration, the type of
consideration chosen by the holders of a majority of the outstanding Shares);
provided, however, that if such consideration received in the merger or sale of
- --------  -------                                                              
assets is not solely common stock of the successor corporation or its Parent,
the Administrator may, with the consent of the successor corporation, provide
for the consideration to be received upon the exercise of the Option or Stock
Purchase Right, for each Share of Optioned Stock subject to the Option or Stock
Purchase Right, to be solely common stock of the successor corporation or its
Parent equal in fair market value to the per

                                       11
<PAGE>
 
share consideration received by holders of Common Stock in the merger, sale or
exchange of capital stock or sale of assets.

     14.  Date of Grant.  The date of grant of an Option or Stock Purchase Right
          -------------                                                         
shall be, for all purposes, the date on which the Administrator makes the
determination granting such Option or Stock Purchase Right, or such other later
date as is determined by the Administrator. Notice of the determination shall be
provided to each Optionee within a reasonable time after the date of such grant.

     15.  Amendment and Termination of the Plan.
          ------------------------------------- 

          (a) Amendment and Termination.  The Board may at any time amend,
              -------------------------                                   
alter, suspend or terminate the Plan.

          (b)  Shareholder Approval.  The Company shall obtain shareholder
               --------------------                                       
approval of any Plan amendment to the extent necessary and desirable to comply
with Applicable Laws.

          (c)  Effect of Amendment or Termination.  No amendment, alteration,
               ----------------------------------                            
suspension or termination of the Plan shall impair the rights of any Optionee,
unless mutually agreed otherwise between the Optionee and the Administrator,
which agreement must be in writing and signed by the Optionee and the Company.
Termination of the Plan shall not affect the Administrator's ability to exercise
the powers granted to it hereunder with respect to Options granted under the
Plan prior to the date of such termination.

     16.  Conditions Upon Issuance of Shares.
          ---------------------------------- 

          (a)  Legal Compliance.  Shares shall not be issued pursuant to the
               ----------------                                             
exercise of an Option or Stock Purchase Right unless the exercise of such Option
or Stock Purchase Right and the issuance and delivery of such Shares shall
comply with Applicable Laws and shall be further subject to the approval of
counsel for the Company with respect to such compliance.

          (b)  Investment Representations.  As a condition to the exercise of an
               --------------------------                                       
Option or Stock Purchase Right, the Company may require the person exercising
such Option or Stock Purchase Right to represent and warrant at the time of any
such exercise that the Shares are being purchased only for investment and
without any present intention to sell or distribute such Shares if, in the
opinion of counsel for the Company, such a representation is required.

     17.  Inability to Obtain Authority. The inability of the Company to obtain
          -----------------------------                                        
authority from any regulatory body having jurisdiction, which authority is
deemed by the Company's counsel to be necessary to the lawful issuance and sale
of any Shares hereunder, shall relieve the Company of any liability in respect
of the failure to issue or sell such Shares as to which such requisite authority
shall not have been obtained.

     18.  Reservation of Shares. The Company, during the term of this Plan, will
          ---------------------                                                 
at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

                                       12
<PAGE>
 
     19.   Shareholder Approval.  The Plan shall be subject to approval by the
           --------------------                                               
shareholders of the Company within twelve (12) months after the date the Plan is
adopted. Such shareholder approval shall be obtained in the manner and to the
degree required under Applicable Laws.

                                       13

<PAGE>
 
                                                                     Exhibit 5.1

                                 April 22, 1997

Rational Software Corporation
2800 San Tomas Expressway
Santa Clara, CA  95051-0951

        RE:    REGISTRATION STATEMENT ON FORM S-8
               ----------------------------------

Gentlemen:

          We have examined the Registration Statement on Form S-8 to be filed by
you with the Securities and Exchange Commission on or about April 22, 1997 (the
"Registration Statement") in connection with the registration under the
Securities Act of 1933, as amended, of 3,308,229 shares of your Common Stock
(the "Option Shares") reserved for issuance under the Performance Awareness
Corporation 1997 Stock Plan and the Rational 1997 Stock Plan (the "Plans"). As
your legal counsel, we have examined the proceedings taken and are familiar with
the proceedings proposed to be taken by you in connection with the sale and
issuance of such Common Stock under the Plan. In addition, for purposes of this
opinion we have assumed that the consideration received by the Company in
connection with each issuance of the Option Shares will include an amount in the
form of cash, services rendered or property that exceeds the greater of (i) the
aggregate par value of such Option Shares or (ii) the portion of such
consideration determined by the Company's Board of Directors to be "capital" for
purposes of the Delaware General Corporation Law.

          Based upon the foregoing, it is our opinion that, when issued and sold
in the manner referred to in the Plan and pursuant to the agreements which
accompany the Plans, the Common Stock issued and sold thereby will be legally
and validly issued, fully paid and non-assessable.

          We consent to the use of this opinion as an exhibit to the
Registration Statement and further consent to the use of our name wherever
appearing in the Registration Statement, including any Prospectus constituting a
part thereof, and any amendments thereto.  This opinion may be incorporated by
reference in any abbreviated registration statement filed pursuant to General
Instruction E of Form S-8 under the Securities Act with respect to the
Registration Statement.

                                        Very truly yours,
                                        WILSON SONSINI GOODRICH & ROSATI
                                        Professional Corporation

                                        /s/ WILSON SONSINI GOODRICH & ROSATI

<PAGE>
 
                                                                    Exhibit 23.1


              CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

        We consent to the incorporation by reference in the Registration
Statement (Form S-8) pertaining to the Performance Awareness Corporation 1997
Stock Plan and the Rational 1997 Stock Plan of Rational Software Corporation of
our reports dated April 22, 1996, with respect to the consolidated financial
statements of Rational Software Corporation incorporated by reference in its
Annual Report (Form 10-K) for the year ended March 31, 1996 and the related
financial statement schedule included therein, filed with the Securities and
Exchange Commission.


                                                      /s/ Ernst & Young


San Jose, California 
April 18, 1997




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