EXHIBIT(a)(5)(C)


FOR IMMEDIATE RELEASE


    MENTOR GRAPHICS ANNOUNCES EXPIRATION OF HART-SCOTT-RODINO WAITING PERIOD
                   ON PROPOSED ACQUISITION OF IKOS SYSTEMS

WILSONVILLE, OR -- January 15, 2002 -- Mentor Graphics Corporation (Nasdaq:
MENT) today announced that the applicable waiting period required under the
Hart-Scott-Rodino Act has expired without the Federal Trade Commission taking
any action in opposition to the proposed acquisition of IKOS Systems, Inc.
(Nasdaq: IKOS).

Pursuant to an all cash tender offer, Mentor Graphics is offering to acquire
IKOS Systems for $11.00 in cash per share of IKOS common stock. The offer
represents a premium of 37% over the Nasdaq closing price of IKOS stock on
December 6, 2001 and a premium of 49.5% over IKOS' closing price on June 29,
2001, the last trading day before IKOS announced its proposed acquisition by
Synopsys, Inc. (Nasdaq: SNPS). Furthermore, the offer represents a premium of
87% over the average closing price of IKOS stock for the thirty trading days
ended December 6, 2001. In addition, Mentor Graphics' offer is subject to
fewer conditions than the Synopsys proposal and can be consummated months
earlier than the Synopsys proposal. Mentor Graphics' offer is not subject to
any financing condition and is scheduled to expire at 12:00 Midnight, New York
City time on Friday, January 25, 2002, unless extended.

ABOUT MENTOR GRAPHICS

Mentor Graphics Corporation (Nasdaq: MENT) is a world leader in electronic
hardware and software design solutions, providing products, consulting services
and award-winning support for the world's most successful electronics and
semiconductor companies. Established in 1981, Mentor Graphics reported revenues
over the last 12 months of more than $600 million and employs approximately
3,000 people worldwide. Corporate headquarters are located at 8005 S.W.
Boeckman Road, Wilsonville, Oregon 97070-7777; Silicon Valley headquarters are


located at 1001 Ridder Park Drive, San Jose, California 95131-2314. World Wide
Web site: www.mentor.com.

Mentor Graphics is a registered trademark of Mentor Graphics Corporation. All
other company or product names are the registered trademarks or trademarks of
their respective owners.

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CONTACTS

Mentor Graphics Corporation            The Abernathy MacGregor Group
Ryerson Schwark                        Chuck Burgess
Tel: 503-685-1660                      Jason Thompson
                                       Tel: 212-371-5999