EXHIBIT 10-A

                       			   MENTOR GRAPHICS CORPORATION

                       			     1982 STOCK OPTION PLAN

Mentor Graphics recognizes that its continuing success depends upon the
initiative, ability and significant contributions of officers and key
employees.  Mentor Graphics believes that by affording such employees the
opportunity to purchase shares in Mentor Graphics it will its ability to
attract and retain such employees and will provide an incentive for them
to exert their best efforts on its behalf.

	The Plan is as follows:

1.  Shares Subject to Option.

	1.1  Options granted under this Plan shall be for authorized but
	 unissued or reacquired common stock of Mentor Graphics.

	1.2  Options may be granted under paragraph 4 of the Plan and stock
	 appreciation rights may be granted under paragraph 8.2 of the Plan
	 for a total of not more than 18,670,000 shares of common stock,
	 subject to adjustment under paragraph 9.  Shares subject to 
	 appreciation rights granted under paragraph 8.2 that are terminated
	 or expire without being exercised, other than options that are
	 surrendered on exercise of a stock appreciation right granted under
	 paragraph 8.1, shall be added to the shares remaining or future
	 options and stock appreciation rights.

	1.3  No employee may be granted options or stock appreciation rights
	 under the Plan for more than an aggregate of 500,000 shares
	 of Common Stock in any calendar year.

2.  Effective Date; Duration.

    This Plan shall be effective January 1, 1982 and shall continue until
    all shares available for issuance under the Plan have been issued,
    unless sooner terminated by the Board of Directors of Mentor Graphics
    (Board of Directors).  Expiration or termination of the Plan shall not
    affect outstanding options, bonus rights or stock appreciation rights.

3.  Administration.

	3.1  The Plan shall be administered by a compensation committee
	  appointed by the Board of Directors (Committee).  The Committee
	  may delegate any of its administrative duties to one or more
	  agents and may retain advisors to assist it.

	3.2  The Committee shall have general responsibility to interpret
	  and administer the Plan.  Any decision by the Committee shall
	  be final and bind all parties.  Notwithstanding the foregoing the
	  Committee's exclusive power to make final and binding
	  interpretations of the Plan shall immediately terminate upon
	  the occurrence of a Change in Control (as defined in paragraph 7.2).
	  The Committee shall keep adequate records of options, bonus rights
	  and stock appreciation rights granted under the Plan and shall be
	  responsible for communication with optionees.

	3.3  No Committee member shall participate in the decision of any
	  question relating exclusively to an option, bonus right or stock
	  appreciation right granted to the member.

     3.4  The Board of Directors may appoint a committee of two or more
	  executive officers of the Company and delegate to it the authority
	  to grant options and take all other actions permitted to 
	  the Committee under paragraphs 4 through 8; provided, however,
	  that the committee of executive officers shall not be authorized
	  to approve or take any other action with respect to grant
	  persons who are executive officers, and the Board of Directors
	  may further limit the authority of the committee.

4.  Grant of Options.

	4.1  Options granted under the Plan may be either incentive stock
	  options within the meaning of Section 422 of the Internal Revenue
	  Code of 1986, as amended (the Code), or options other 
	  than incentive stock options (nonqualified stock options).  No
	  incentive stock options may be granted under the Plan on or after
	  the tenth anniversary of the last action by the Board of
	  Directors approving an increase in the number of shares available
	  for issuance under the Plan, which action was subsequently
	  approved within 12 months by the shareholders.

	4.2  Options may be granted to any officer or key employee of Mentor
	  Graphics and any subsidiary of Mentor Graphics and may be granted
	  in substitution for outstanding options of another corporation by
	  reason of merger, consolidation, acquisition of property
	  reorganization between such other corporation and Mentor Graphics
	  or any subsidiary of Mentor Graphics.  Additional options may be
	  granted to existing optionees and may be granted in exchange for
	  outstanding options.

	4.3  The Committee shall designate persons to receive grants, and as
	  to each option shall specify the number of shares, the option
	  price and term, the time or times at which the option may 
	  be exercised, whether the option is an incentive stock option or
	  a nonqualified stock option and all other terms and conditions
	  of the option.

    44.4  No employee may be granted incentive stock options under the Plan
	  such that the aggregate fair market value, on the date of grant,
	  of the shares with regard to which incentive stock options are
	  exercisable for the first time by that employee during any 
	  the Plan and under any other stock option plan of Mentor Graphics
	  or any parent or subsidiary of Mentor Graphics exceeds $100,000.
	  Fair market value shall be determined under subparagraph
	  5.1(c) as of the date of each grant.

5.  Option Terms.

	5.1  The option price shall be fixed by the Committee as follows:

	      (a)  Subject to (b) the option price for an incentive stock option
	    shall be not less than the fair market value of the shares on
	    the date of grant.  The option price for a nonqualified stock
	    option shall be not less than 50% of the fair market value of
	    the shares on the date of grant.

		(b)  If the optionee at the time of grant owns stock possessing more
	    than 10 percent of the combined voting power of all classes of
	    stock of Mentor Graphics, the option price for an incentive
	    stock option shall be not less than 110 percent of the fair
	    market value of the shares on the date of grant.  Stock owned
	    by the optionee shall include for this purpose, and for purposes
	    of paragraph 5.2, stock attributed to the optionee pursuant to
	    applicable provisions of the Code.

		(c) "Fair market value" means an amount determined by, or in an
	    manner approved by, the Committee.  The Committee may appoint
	    and rely on one or more qualified independent appraisers to   
	    value the stock or use such other evaluation as it considers
	    appropriate.

	5.2   The Committee shall fix a time limit of not over 10 years after
	  the date of grant for exercise of an incentive stock option. 
	  The Committee shall fix a time limit of not over 10 years 
	  plus seven days after the date of grant for exercise of a
	  nonqualified stock option.  For a more than 10 percent shareholder
	  the maximum limit for exercise of an incentive stock option shall
	  be 5 years.  The Committee may make the option exercisable in full
	  immediately or in graduated amounts over the option term.

	5.3   The option shall be evidenced by a stock option agreement executed
	  by Mentor Graphics and the optionee in a form prescribed by the
	  Committee.

	5.4   The option may not be assigned or transferred except on death, by
	  will or operation of law, or pursuant to a qualified domestic
	  relations order as defined under the Code or Title I of the 
	  Employee Retirement Income Security Act.  The option may be
	  exercised only by the optionee or by a successor or representative
	  after death.

 5.5   Unless otherwise determined by the Committee, if an officer of
	  Mentor Graphics subject to Section 16 of the Securities Exchange
	  Act of 1934 (1934 Act) exercises an option within six 
	  months of the grant of the option, the shares acquired upon
	  exercise of the option may not be sold until six months after the
	  date of grant of the option.

6.   Bonus Rights.

	6.1   The Committee may grant bonus rights in connection with
	  nonqualified stock options granted under the Plan.  Bonus rights
	  may be granted with the related option or at a later time
	  bonus right may not be assigned or transferred except on death,
	  by will or operation of law, or pursuant to a qualified domestic
	  relations order as defined under the Code or Title I of the
	  Employee Retirement Income Security Act.  Bonus rights will be
	  subject to such rules, terms, and conditions as the Committee may
	  prescribe.

	6.2   A bonus right will entitle an optionee to a cash bonus in
	  connection with the exercise in whole or in part of the related
	  option.  Subject to paragraph 6.3, the amount of the bonus
	  determined by multiplying the applicable bonus percentage by the
	  amount by which the fair market value, on the exercise date, of
	  the shares received on exercise of the related option exceeds the
	  option price.  The cash bonus will be payable within 30 days
	  following the date as of which its amount is determined.  For the
	  purpose of this paragraph, fair market value shall be
	  determined according to subparagraph 5.1(c).  The bonus percentage
	  applicable to a bonus right shall be determined by the Committee,
	  but shall in no event exceed 100 percent.

	6.3   The Committee may set a maximum dollar limit on the amount of
	  cash to be paid under any bonus right.

7.   Acceleration Upon Change in Control.

	7.1   The Committee may grant acceleration rights to holders of options
	  or stock appreciation rights which will provide that the options
	  or stock appreciation rights will become exercisable in 
	  full for the remainder of their terms upon the occurrence of a
	  Change in Control.  Acceleration rights may be granted with an
	  option or stock appreciation right or at a later time by amendment
	  of outstanding options or stock appreciation rights.

	7.2   "Change in Control" means the occurrence of any of the following
	   events, unless prior to the occurrence of the event, the
	   Committee determines that the specific event shall not be 
	   considered a Change in Control:

		(a)     the shareholders of Mentor Graphics shall approve:

		(i)  any consolidation, merger or plan of share exchange involving
	     Mentor Graphics (Merger) in which Mentor Graphics is not the
	     continuing or surviving corporation or pursuant to which shares
	     of common stock would be converted into cash, securities or
	     other property, other than a Merger involving Mentor Graphics
	     in which the holders of Mentor Graphics' common stock
	     immediately prior to the Merger have the same proportionate
	     ownership of common stock of the surviving corporation
	     immediately after the Merger;

		(ii)  any sale, lease, exchange or other transfer (in one transaction
	     or a series of related transactions) of all, or substantially
	     all, the assets of Mentor Graphics; or

		(iii)   the adoption of any plan or proposal for the liquidation or
	      dissolution of Mentor Graphics;

	(b)   at any time during a period of two consecutive years, individuals
	 who at the beginning of such period constituted the Board of
	 Directors (Incumbent Directors) shall cease for any reason to
	 constitute at least a majority thereof, unless each new director
	 elected during such two-year period was nominated or elected by
	 two-thirds of the Incumbent Directors then in office and 
	 voting (new directors nominated or elected by two-thirds of the
	 Incumbent Directors shall also be deemed to be Incumbent
	 Directors); or

		(c)   any person (as such term is used in Section 13(d) of the 1934 Act)
	 shall, as a result of a tender or exchange offer, open market
	 purchases, privately negotiated purchases or otherwise, 
	 have become the beneficial owner (within the meaning of Rule 13d-3
	 under the 1934 Act), directly or indirectly, of securities of
	 Mentor Graphics ordinarily having the right to vote in the 
	 election of directors (Voting Securities) representing twenty
	 percent (20%) or more of the combined voting power of the then
	 outstanding Voting Securities.

8.  Stock Appreciation Rights.

  8.1   (a)  The Committee, in its sole discretion, may grant both
  "general" and "limited" stock appreciation rights with all or any part of
  an incentive stock option or a nonqualified stock option granted under the
  Plan.  Stock appreciation rights may be granted with the any later time
  during the term of the option.

		(b)  A general stock appreciation right granted with all or any part
  of an option shall be exercisable only at the time or times established by
  the Committee and only to the extent that the related option could be
  exercised.  A limited stock appreciation right shall be exercisable only
  during the 60 calendar days immediately following a Change in Control and
  only if the immediate resale of shares acquired upon exercise of the related
  option would subject the optionee to liability under Section 16(b) of the
  1934 Act; provided, however, that a limited stock appreciation right
  may not be exercised within six months of its date of grant.  Upon exercise
  of a stock appreciation right, the option or portion thereof to which the
  stock appreciation right relates must be surrendered.  The shares subject to
  an option or portion thereof that is surrendered upon exercise of a stock
  appreciation right shall not be available for future option or stock
  appreciation right grants under the Plan.

		(c)  Each stock appreciation right  granted with all or any part of an
	   option shall entitle the holder to receive from Mentor Graphics
	   an amount equal to the excess of the fair market value at
	   the time of exercise of one share of Mentor Graphics common stock
	   over the option price per share under the related option,
	   multiplied by the number of shares covered by the related option
	   or portion of the related option.

		(d)  The terms of a limited stock appreciation right granted with a
	   nonqualified stock option may provide, if so determined by the
	   Committee, that the fair market value of the common stock for
	   purposes of subparagraph 8.1(c) shall be equal to the higher of:

			(i) the highest reported sales price of the common stock during
       the 60-day period ending on the date the limited stock appreciation
       right is exercised;

			(ii) the highest per share price paid for shares of common stock
       purchased in any tender or exchange offer during the 60 calendar days
       preceding the exercise of the limited stock appreciation right;

		(iii) the fixed or formula price to be received by holders of
       shares of common stock in or as a result of any transaction described
       in subparagraph 7.2(a) if such price is determinable on the date of
       exercise, provided that any securities or other property are part of
       the fixed or formula price shall be valued at the highes securities
       or property in any communication to the shareholders of Mentor Graphics
       by any party to the transaction; and

			(iv) the highest price per share shown on a Schedule 13D, or any
       amendment thereto, filed by the holder or holders of the specified
       percentage of common stock whose acquisition gives rise to the
       exercisability of the limited stock appreciation right.

	8.2  (a)   The Committee may grant general stock appreciation rights
without related options under the Plan to any officer or key employee of
Mentor Graphics and any subsidiary of Mentor Graphics.  Such stock
appreciation rights may be granted in substitution for outstanding stock
appreciation rights of another corporation by reason of merger,
consolidation, acquisition of property or stock, or other reorganization
between such other corporation and Mentor Graphics or any subsidiary of
Mentor Graphics.  Additional stock appreciation rights may be granted to
existing holders of stock appreciation rights and may be granted in
exchange for outstanding stock appreciation rights.

		(b)   The Committee shall designate persons to receive grants of
stock appreciation rights, and as to each stock appreciation right shall
specify the number of shares, the stock appreciation right price, the term,
the time or times at which the stock appreciation right all other terms and
conditions of the stock appreciation right.  The stock appreciation right
price shall not be less than 50% of the fair market value of the shares on
the date of grant.

		(c)   Each stock appreciation right granted without a related
option shall entitle the holder to receive from Mentor Graphics an amount
equal to the excess of the fair market value at the time of exercise of one
share of Mentor Graphics common stock over the stock appreciation right
price, multiplied by the number of shares covered by the stock appreciation
right or portion thereof that is exercised.  The shares subject to a stock
appreciation right or portion thereof that is exercised shall not be
available for future option or stock appreciation right grants under the Plan.

    8.3  (a)   Payment upon exercise of a general stock appreciation right
by Mentor Graphics may be made in shares of Mentor Graphics common stock
valued at fair market value, or in cash, or partly in shares and partly
in cash.  The Committee shall either specify the form of payment or 
retain the power to disapprove any election by a holder to receive cash
appreciation right.  For the purpose of this paragraph, fair market value
shall be determined according to subparagraph 5.1(c).

		(b) Payment upon exercise of a limited stock appreciation right by
Mentor Graphics may be made only in cash.

	8.4  No fractional shares shall be issued upon exercise of a stock
appreciation right.  In lieu thereof, cash may be paid in an amount equal
to the value of the fraction or, in the discretion of the Committee, the
number of shares may be rounded to the next whole share.

	8.5  Stock appreciation rights will be subject to such rules, terms,
and conditions, and shall be evidenced by an agreement in such form, as
the Committee may prescribe prior to the occurrence of a Change in Control.

    8.6  Stock appreciation rights may not be assigned or transferred
except on death, by will or operation of law, or pursuant to a qualified
domestic relations order as defined under the Code or Title I of the
Employee Retirement Income Security Act.  Stock appreciation rights may be
exercised only by the holder or by a successor or representative after death.

	8.7  Unless otherwise determined by the Committee, no stock appreciation
right may be exercised by an officer of Mentor Graphics subject to Section
16 of the 1934 Act during the first six months following the date of grant.

9.  Changes in Capital Structure.

	If any change is made in the outstanding common stock without Mentor
Graphics' receiving any consideration, such as a stock split, reverse stock
split, stock dividend, or combination or reclassification of the common
stock, a corresponding change shall be made in the number of shares
remaining available for grants of options or stock appreciation rights
under paragraph 1, disregarding fractional shares, without any further
approval of the shareholders.  The adjustment shall be made by the Committee
whose determination shall be conclusive.

10. Amendment or Termination of the Plan.

  10.1  The Board of Directors may amend or terminate this Plan at any
time subject to paragraph 10.2.

	10.2  Unless the amendment is approved by the shareholders, no amendment
shall be made in the Plan that would:

	(a) Increase the total number of shares available for options or
	stock appreciation rights;

		(b) Increase the maximum option term; or

		(c) Modify the requirements for eligibility under the Plan.