Filed by Credence Systems Corporation
               Pursuant to Rule 425 under the Securities Act of 1933, as amended
                                 and deemed filed pursuant to Rule 14a-12 of the
                                     Securities Exchange Act of 1934, as amended

                           Subject Company: Integrated Measurement Systems, Inc.
                                                 Commission File No.: 000-026274

                                                                CREDENCE SYSTEMS
                                                    Moderator:    Graham Siddall
                                                                          Page 1


                                CREDENCE SYSTEMS

                          Moderator:    Graham Siddall
                                  May 16, 2001
                                  4:00 p.m. MT


Operator:        Ladies and gentlemen, thank you for standing by. Welcome to the
                 Credence second quarter earnings release conference call. At
                 this time all participants are in a listen only mode. Later we
                 will conduct a question and answer session. At that time, if
                 you have a question, you will need to press the one, followed
                 by the four on your push button phone. As a reminder this
                 conference is being recorded Wednesday, May 16, 2001. I would
                 now like to turn the conference over to John Detwiler, Senior
                 Vice President and Chief Financial Officer of Credence. Please
                 go ahead sir.

John Detwiler:   Thank you, I am here with Graham Siddall, our Chief Executive
                 Office and President, Dave Ranhoff, our Executive Vice
                 President and Chief Operating Officer, and a special guest, Mr.
                 Keith Barnes, the Chairman and Chief Executive Officer of
                 Integrated Measurement Systems, Inc. or IMS.

                 Welcome to the second fiscal quarter 2001 earnings release
                 conference call for Credence Systems. Graham will discuss with
                 you the highlights of the second fiscal quarter as well as the
                 state of the business. I will discuss business and operational
                 results as well as an analysis of the financials and share with
                 you the business outlook for Credence Systems in 2001. We will
                 not at this time discuss the business outlook for IMS, as
                 completion of


                                                                CREDENCE SYSTEMS
                                                    Moderator:    Graham Siddall
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                 the transaction is still pending IMS shareholder approval as
                 well as regulatory approval. We would refer you to IMS' SEC
                 filings and public disclosures for information about the
                 company. At the conclusion of my comments we will open the call
                 for questions. We intend to limit today's conference call to
                 one hour and therefore, our opening comments will be relatively
                 brief.

                 Before we begin, however, I would like to make some cautionary
                 statements. By now you have probably reviewed our press
                 release, which was e-mailed to you this afternoon. If you have
                 not received the release please call Patricia Ling at
                 (510) 623-4703 and she can provide it for you. During the
                 course of this conference call we will make forward-looking
                 statements regarding future events or the future performance of
                 our company. Any such projections are based on limited
                 information available to the company, which is subject to
                 change. Although projections and the factors influencing them
                 will likely change, we will not necessarily update the
                 information since the company is only providing guidance at
                 certain points during the year. Actual events or results could
                 differ materially and no reader of this release should assume
                 later in the quarter that the information we provide today is
                 still valid. Such information speaks only as of today. Specific
                 factors could change, causing our projections not to be
                 achieved. We refer you to the documents the company files from
                 time to time with the Securities and Exchange Commission.

                 I now turn the call over to Graham.

Graham Siddall:  Thank you John.   Overcapacity in the test sector, particularly
                 at our foundry and subcontract customers in Asia, continued in
                 the second fiscal quarter of 2001. During the quarter we booked
                 only $28 million of new orders, resulting in a book to bill
                 ratio of approximately 0.65. In addition, during this quarter
                 we experienced some order cancellations and in response to the
                 weak conditions in the industry decided to work pro-actively
                 with customers to clear out backlog that could not be scheduled
                 with


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                                                    Moderator:    Graham Siddall
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                 reasonable certainty. This activity led to a reduction in the
                 previous backlog of $78 million. Net de-bookings therefore were
                 $50 million for the fiscal quarter. It is clear that in the
                 current economic environment our customers will not be adding
                 significant additional testing capacity until utilization rates
                 improve.

                 With revenue at $43.3 million our sequential decline from Q1
                 2001 was 65 percent. As we have continually communicated, we
                 are in a cyclical downturn in the test and assembly section of
                 the industry that probably began in October 2000 and could last
                 several more quarters before the excess test capacity is fully
                 absorbed and growth in our business resumes. We stated at the
                 beginning of the year our belief that a recovery may not occur
                 until late calendar 2001 or early in 2002. We still adhere to
                 that view. Some of our customers and others in the industry are
                 forecasting a return to growth as early as the third quarter of
                 this calendar year. We would of course welcome that opportunity
                 and are managing our business to be prepared for this
                 possibility but we are skeptical and have adopted a more
                 cautious approach. For the purposes of managing our business we
                 are assuming that bookings growth will not resume until fiscal
                 Q4 at the earliest.

                 With revenues continuing to fall, we reduced our head count by
                 a further 8 percent last Thursday. In the last three months, we
                 have reduced our headcount by about 300 employees. From a peak
                 of 1,450 in the first fiscal quarter, our headcount has now
                 fallen to approximately 1,140 today. In addition, we have
                 implemented a salary reduction for all domestic employees and
                 continue to operate on a reduced work schedule. Our goal is to
                 reduce our recurring quarterly operating expenses to
                 approximately $42 to $43 million per quarter in the next few
                 months. This figure includes the amortization of purchased
                 intangibles of $6.1 million per quarter. Reaching these goals
                 brings our break-even revenue level to approximately $65
                 million per quarter, excluding the amortization, or about $75
                 million per quarter with the amortization charges.


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                                                    Moderator:    Graham Siddall
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                 Visibility is still very murky but without improvements in
                 business conditions we now expect the next fiscal quarter's
                 revenue to be down sequentially from Q2 2001. We will review
                 the outlook with you in more detail in a few moments.

                 I would now like to discuss where I believe we are in the
                 semiconductor equipment cycle, and in particular, how this
                 environment has impacted Credence's business. As we discussed
                 on our last conference call, test equipment bookings began
                 declining in the November-December time frame. Test capacity
                 utilization declined from over 90% last October to the 80%
                 range in January and has fallen steadily and dramatically to
                 about 50% in April. The decline in test capacity utilization in
                 the Asia Pacific region where Credence has most of its business
                 is much greater than the declines experienced by IDM companies
                 in the rest of the world. As a pure play test company with
                 approximately 60% of our business with the foundry and
                 subcontract test companies in Asia it is clear that our
                 business will be impacted negatively until the back end
                 overcapacity is worked off and this could take several more
                 quarters. This booking weakness has now spread to the front end
                 wafer fab area, particularly for 200 millimeter equipment, but
                 the situation is clearly worse in the capacity -driven test and
                 assembly sector.

                 In the end, resumption of growth for the whole industry will be
                 based on greater spending in the end user markets. We believe
                 that this will not reassert itself until very late calendar
                 2001 or 2002. Clearly the length and depth of this cycle will
                 also be driven by the general health of the economy and this is
                 where the current federal initiatives on interest rate and
                 income tax cuts could prove beneficial.

                 Our business in Europe during Q2 represented 9 percent of gross
                 bookings and 17 percent of revenue. Our North America business
                 represented 40 percent of our revenue and 14 percent of our
                 gross booking during Q1. Asia was 37 percent of revenue


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                                                    Moderator:    Graham Siddall
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                 and 77 percent of gross bookings. 40 percent of the canceled
                 orders during the quarter were from Taiwan, 24% were in North
                 America and 33% were in Southeast Asia outside of Taiwan.

                 The top 10 Credence customers represented 51 percent of our
                 business in Q2 and 58 percent for all of fiscal 2001. Our mixed
                 signal business represented 69 percent of our year-to-date
                 revenue. Logic represented 5 percent and non-DRAM memory,
                 primarily flash, represented 15 percent. The remaining 11
                 percent of our business was made up of service and software.

                 Successful companies in the semiconductor equipment business
                 have demonstrated time and again that it is during the
                 downturns in the industry that the seeds are sown for success
                 in the upturn. The expense reductions we effected in the last
                 three months were necessary since the company was gearing up to
                 an $800 million revenue level which is clearly not going to
                 happen in the current market environment. However, despite the
                 reduction in head count of 300 people we are minimizing the
                 impact of the cuts in customer support and engineering and are
                 preparing the company to catch the next wave in business which
                 we believe could surface in earnest in calendar 2002. We are
                 focused on four major new product initiatives in the areas of
                 mixed signal test, flash memory test, wireless test solutions,
                 and design for test initiatives that have the potential to
                 break the increasing cost of test trend. We are also using the
                 downturn to restructure the company for greater efficiency by
                 fully integrating the numerous acquisitions that we have made
                 over the past year.

                 We are determined to position the company strategically for
                 growth in new markets and with new customers as we come out of
                 this painful downturn. It is in this last regard that today we
                 announced a definitive agreement to acquire Integrated
                 Measurement Systems, Inc. in a pooling of interests
                 transaction. We also signed a shareholder's agreement with
                 Cadence, IMS' largest shareholder. The agreement still awaits
                 shareholder and


                                                                CREDENCE SYSTEMS
                                                    Moderator:    Graham Siddall
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                 regulatory approval. IMS specializes in providing high
                 performance integrated circuit validation systems, typically
                 for the design engineer in the design prototype stage for
                 validating and characterizing complex IC's. IMS is based in
                 Beaverton, Oregon with about 300 employees.

                 We believe IMS is an ideal strategic fit for Credence. Not only
                 are both companies' product lines fully complementary, but
                 together we will address the complex challenges of IC testing
                 from engineering through production. By pooling our resources
                 and strengths we can aggressively pursue opportunities in key
                 IDMs, increase our presence in North America, Asia and Europe,
                 and broaden our customer and relationship base. While IMS
                 supports the IC design engineer at the prototype stage for
                 validating and characterizing complex digital, mixed-signal,
                 and memory ICs, Credence focuses predominately on the high-
                 volume production-oriented customer. IMS provides stable,
                 technology-driven revenue in the down cycles of the industry
                 and hence will make the revenue stream of the combined company
                 less volatile. We believe that the combined company will be the
                 first test equipment manufacturer in the industry to provide
                 solutions from silicon characterization and validation to high
                 volume production test.

                 IMS will continue to operate in its current facility as a
                 wholly-owned subsidiary of Credence Systems Corporation. Our
                 Fluence subsidiary, which is only a few blocks away in
                 Beaverton, will be combined with IMS. Keith Barnes, IMS'
                 chairman and chief executive officer, will manage the new
                 subsidiary as executive vice president of Credence Systems and
                 president of Integrated Measurement Systems, Inc., a Credence
                 Company. Both Fluence and IMS have contracts with other tester
                 companies and we will continue to honor these contracts. I am
                 delighted to have Keith Barnes with us today and he will be
                 commenting on the acquisition later in this conference call.


                                                                CREDENCE SYSTEMS
                                                    Moderator:    Graham Siddall
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                 Overall we are naturally very disappointed with the Q2 business
                 level and realize that we are probably in for at least another
                 two quarters before business improves. However, we believe that
                 we are well positioned as a company and look forward to the
                 eventual upturn and opportunities of the future. I will now
                 turn the call over to John, who will review the financial and
                 operational details as well as the fiscal 2001 outlook.

J. Detwiler:     Thank you, Graham.  The highlights of the second fiscal
                 quarter's financials are as follows:

                 Bookings for the quarter were $28 million, representing a 0.65
                 book to bill before the canceled orders. After the canceled
                 orders, the book to bill is negative. Our revenue for the
                 quarter stood at $43.3 million, down $79.9 million from the
                 previous quarter, or 65 percent. The gross profit margins for
                 Q2 stood at 48.2 percent, as compared to 57.3 percent last
                 quarter. We also took a charge in the quarter for the provision
                 of excess inventory of $45 million. We made this decision as we
                 gained greater visibility on the length and depth of this
                 industry downcycle. This provision was largely earmarked for
                 our logic and mixed signal product lines. Our inventory levels
                 decreased by about $29 million from the Q1 levels after this
                 provision. We continue to work to slow the inventory pipeline
                 in light of the changing industry environment. We currently
                 believe the inventory levels will peak in the third quarter,
                 but this is dependent on the future revenue results. Our total
                 operating expenses for Q2 were $48.8 million, down from $51.4
                 million in Q1. Excluding the special charges for our recent
                 headcount reductions, the operating expenses stood at $46.8
                 million, or down $4.6 million from the last quarter.

                 As we articulated in our last conference call, our short term
                 operating goal was to reduce recurring operating expense levels
                 to approximately $46 million per quarter, which includes the
                 purchased amortization. We almost reached that goal this
                 quarter. For next quarter, our goal will be to reduce these


                                                                CREDENCE SYSTEMS
                                                    Moderator:    Graham Siddall
                                                                          Page 8

                 operating expenses to $42 to $43 million per quarter. The
                 ongoing intangible amortization charges for the DCI and Rabkin
                 acquisitions added approximately $900,000 per quarter to the
                 run rate.

                 Our head count, ending Q2, was 1,140. As we mentioned, we
                 reduced our head count a further 100 people last Friday. We
                 plan to hold our head count relatively constant at this level
                 as we move toward our goal of lowering our recurring operating
                 expenses to the $42 million goal per quarter.

                 Research and development expenses for the second fiscal quarter
                 were $19 million, as compared to $20.5 million in the first
                 quarter. For the year, we expect to have R&D expenses at
                 approximately the $76 million level.

                 Selling, general and administrative expenses were $21.7 million
                 for the first quarter, as compared to $25.8 million in the
                 prior quarter.

                 The amortization of purchased intangibles is expected to remain
                 at $6.1 million per quarter.

                 Our total cash plus marketable securities stood at $343 million
                 and our days sales outstanding rose to 130 days as the
                 collection and payment term environment continued to
                 deteriorate in the quarter. Net interest and other income for
                 our first fiscal quarter stood at $4.7 million. Taking account
                 of the disbursement of $6 million for the purchase of Rabkin
                 during the quarter, our net cash change for the quarter was
                 almost neutral.

                 Total outstanding average diluted shares for the second fiscal
                 quarter stood at 54.04 million, down about 300,000 shares. For
                 purposes of the EPS, options were ignored this quarter because
                 they are anti-dilutive in periods when we have a loss.

                 If you exclude the special charges in the quarter, our pro-
                 forma


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                                                    Moderator:    Graham Siddall
                                                                          Page 9

                 net loss stood at $13.6 million, or $0.26 per share. We used a
                 tax benefit rate of 35 percent for the year-to-date and for the
                 time being, we recommend that you use this rate for the
                 remainder of the year.

                 I now turn to the financial outlook for the rest of fiscal
                 2001. We believe Q3 revenue will be down in the $30 to $40
                 million range and that we will be at or near the bottom in Q3,
                 but we do not expect a significant rebound in Q4. We would
                 expect to have our recurring operating expenses down to the $42
                 to $43 million level, including the amortization charges. We
                 expect the loss for the third quarter to be in the $0.25 to
                 $0.35 range, including the amortization charges.

                 We believe our book to bill will remain below 1.0 in Q3. At
                 this point it is difficult to provide fair guidance on
                 bookings. This guidance is dependent on the current weak
                 business environment not getting any worse. As we have reviewed
                 with you, the business outlook for the next six months is very
                 uncertain. Despite the current market conditions, we are
                 excited about Credence's prospects and our future earning
                 opportunities. We completed a year of gaining significant
                 market share and diversifying our business and believe that
                 this provides the foundation for future growth.

                 We will now turn to Keith Barnes for a few words before we open
                 up the call for questions.

Keith Barnes

                 Good afternoon. For several years, we at IMS have known
                 Credence Systems. Both companies have roots that go back to
                 Tektronix and we have supported certain Credence ATE products
                 with our VT SW products. We have produced tester fixtures,
                 which make certain of our systems compatible with some of
                 theirs. This has assisted mutual customers to rapidly move from
                 the design environment using IMS systems to the production test
                 phase where they use Credence systems. We have had discussions


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                                                    Moderator:    Graham Siddall
                                                                         Page 10

                 in the past about combining their Fluence division with our VT
                 SW division, as well.

                 We make complementary systems and software products. While IMS
                 supports the design engineer in the design prototype stage for
                 validating and characterizing of complex digital, mixed-signal,
                 and memory ICs, Credence predominantly supports the backend
                 production oriented customer.

                 The flow from design validation to production test is a natural
                 flow and this combination is one, we believe, which will
                 provide great value to our customers and to our shareholders,
                 alike.

                 The unique marriage of IMS prototype validation test technology
                 with EDA technology has always been a key differentiator. We
                 have been strongly influenced by the needs of the IC designer.
                 Many of the world's leading semiconductor manufacturers and
                 systems manufacturers are our customers. These customers need
                 to move rapidly from design validation to production test with
                 confidence. The combination of IMS and Credence will assist
                 them with this flow.

                 We tie directly into the Cadence, Synopsys, and Mentor Graphics
                 design simulation environment to extract the design intent and
                 assist our customers during the prototype validation phase to
                 determine design, fabrication, and performance anomalies.

                 Our systems products are used to validate complex prototype IC
                 s which include Digital Processors including, but not limited
                 to, DSPs, fixed and floating point, leading microprocessors and
                 microcontrollers, embedded processors, etc... We also validate
                 leading edge Mixed Signal devices used in Graphics, Network
                 Processing, Wireless Communications, etc... And we validate
                 designs in the high speed memory area including DRAM, SRAM, DDR
                 RAM, and RAMBUS memories. Further, as these elements are
                 combined into complex SOC devices, we have systems which also
                 validate these integrated SOC devices.


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                                                    Moderator:    Graham Siddall
                                                                         Page 11

                 As I mentioned before, we also have a Virtual Test Software
                 division that provides tools for designers and test engineers
                 to move data from the design phase to the production phase.
                 These tools enable test IP development and simulation using
                 standard Verilog and VHDL simulation tools. Credence is one of
                 the ATE vendors we support with our VT products.

                 IMS and Credence have complementary offerings in each of these
                 categories. When combined we will be able to provide our
                 customers with a smooth flow from design to production test,
                 providing greater value to our customers from a single
                 supplier.

                 IMS's main customers include the leading IDM's as well as
                 fabless semiconductor companies, and systems manufacturers
                 located throughout the world. Credence's customers are mainly
                 test houses and contract manufacturers, and primarily located
                 in Asia. Together, we can expand our focus to a broader
                 customer base and more diversified geographical mix. More
                 customers in more companies with a broader mix of technologies
                 should add up to more value for the customer and for Credence
                 investors.

                 Other synergies exist on the technology development and
                 integration side. IMS deals in the newest high-speed, high-
                 complexity designs. The Credence production test products will
                 need to meet similar speed and pin count requirements within a
                 year or so after IMS build its products for the designers.
                 Sharing the technology development will lower the overall R&D
                 for both companies and allow us to get to market faster. We
                 should be able to achieve lower product costs because of higher
                 volumes of commonly used components and subsystems. And, by
                 having more of a prototyping phase on the IMS products before
                 ramping the production on Credence products, we should be able
                 to achieve better overall quality.

                 Like Credence, IMS is proud of its quality record. For seven
                 years in a row, IMS has been ranked by its customers as number


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                                                    Moderator:    Graham Siddall
                                                                         Page 12

                 one in the world for quality and customer service.

                 In summary, we believe this deal makes good business and
                 financial sense. It provides a great product flow for our
                 mutual customers, it allows us to leverage more technology to a
                 broader customer base worldwide, and this should translate to
                 better shareholder value for IMS and Credence shareholders as
                 we execute.


John Detwiler:   We will now turn the conference call over to the operator for
                 your questions.  Thank you.

Operator:        Ladies and gentlemen, we will now begin the question and answer
                 session. If you have a question, you will need to press the
                 one, followed by the four, on you push button phone. You will
                 hear a three tone prompt acknowledging your request, and your
                 questions will be polled in the order they are received. If
                 your question has been answered, and you would like to withdraw
                 your polling request, you may do so by pressing the one,
                 followed three, on your push button phone. If you are using a
                 speaker phone, please pick up your hand set before pressing the
                 numbers.

                 One moment please, for the first question.

        Keith Endres, Transcription Coordinator at 303-633-3879


Additional Information and Where to Find It

     Investors and security holders are advised to read the proxy
statement/prospectus regarding the transaction described in these materials,
when it becomes available, because it will contain important information. The
proxy statement/prospectus will be filed with the SEC by Credence and IMS.
Security holders may obtain a free copy of the proxy statement/prospectus, when
it becomes available, and other related documents filed by Credence and IMS at
the SEC's website at www.sec.gov or at the SEC's public reference room located
at 450 Fifth Street, NW, Washington D.C. 20549 or at one of the SEC's other
public reference rooms in New York, New York and Chicago, Illinois. Please call
the SEC at 1-800-SEC-0330 for further information on the public reference rooms.
When available, the proxy statement/prospectus and the other documents may also
be obtained by contacting by either company.