Document:

<PAGE>

                                                                   Exhibit 10.37

                          CREDENCE SYSTEMS CORPORATION
                               215 Fourier Avenue
                               Freemont, CA 94539

                                January 15, 2002

Mr. Keith L. Barnes

Dear Keith:

          Reference is made to (i) your employment agreement, dated March 25,
1998 (the "Employment Agreement"), by and between you and Integrated Measurement
Systems, Inc. and (ii) the letter agreement (the "Letter Agreement;" and
together with the Employment Agreement, the "Agreements"), dated August 1, 2001,
by and among, you, Integrated Measurement Systems, Inc. and Credence Systems
Corporation (the "Company").

          For good and valuable consideration, receipt of which is hereby
acknowledged, the parties agree that notwithstanding the terms of the Agreements
or the relevant stock option agreements, to the extent that you are terminated
"without cause" as described in your Employment Agreement, the final exercise
date of any options which you are vested in pursuant to the terms of the
Agreements or the relevant stock option agreement on the date of such
termination shall be extended until the earlier of (i) the expiration of the
                                        -------
option term or (ii) the end of the twelve (12) month period following the date
of such termination.

          Please indicate your acceptance of the foregoing by signing the
enclosed copy of this letter and returning it to the Company.

                                               Very truly yours,

                                               /s/ Graham J. Siddall
                                               ---------------------
                                               Graham J. Siddall
                                               Chief Executive Officer and
                                               Chairman of the Board

ACKNOWLEDGED AND AGREED:

/s/ Keith L. Barnes
-------------------
Keith L. Barnes<PAGE>

                                                                   Exhibit 10.38
                                                                   -------------

October 1, 2001

Mr. Fred Hall

________________

________________

Dear Fred,

I am pleased to offer you the position of Sr. Vice President, Human Resources,
reporting directly to me, with an effective date of October 1, 2001. This is an
exempt position with a biweekly base salary rate of $7,308.00 that annualizes to
$190,008. Effective April 30, 2001, the Company implemented a Pay Reduction
Program. Your annual base salary will be subject to this reduction and will be
reduced by the percentage appropriate to your position classification. Currently
this is 15%. You will continue to be on the IMS payroll through the year 2001.

Your specific job responsibilities will be based upon the position requirements
as described by me. These responsibilities will be subject to change, based on
the needs of the Company.

In addition, Credence offers an Executive Incentive Program. The goal of the
Credence Executive Incentive Program is to reward participating executives for
their efforts in meeting pre-defined personal objectives and helping Credence to
achieve financial performance goals. The Executive Incentive Program is
renewable on a yearly basis. If renewed, you will be eligible to participate in
the FY 2002 plan. Under the current program guidelines, as a participant, you
would be eligible for a target bonus of 40% of paid base salary. The specific
details of your plan participation will be documented and communicated to you
following the effective date of the program. You will continue to be eligible to
participate in the IMS incentive plan through the balance of calendar year 2001.

This offer includes a grant of incentive stock options (ISO) to purchase a total
of 40,000 shares of the Company's outstanding common stock (to the extent ISOs
may be granted to you under the federal tax laws with any remaining balance
granted as non-statutory stock options), vesting as hereafter provided, subject
to approval by the Company's Board of Directors. Options to purchase 20,000
shares will vest according to the Company's standard four-year vesting policy.
The remaining 20,000 options vest in one year, subject to the same guidelines as
outlined above (except that any shares treated as non-statutory stock options
will also vest in one year.) If approved, the exercise price of the stock
options will be equal to the fair market value of the common stock on the date
the options are approved by our Board of Directors. You will find that this ISO
grant may present favorable tax treatment compared to other non-qualified plans.
A copy of the 1993 Stock Option Plan will be made available to you. These stock
options do not preclude additional options being given in the future.

<PAGE>

Additionally, you will receive allowances in the form of ordinary income
totaling $791.50 monthly. These consist of a $500 monthly automobile allowance,
a $125 monthly financial and tax planning allowance, and a $166.50 monthly
health club allowance. These will be paid to you along with your normal biweekly
pay.

Employment with Credence is not for a specified term and can be terminated by
you or by Credence at any time and for any reason, with or without cause or
advance notice. Notwithstanding the foregoing, if the Company terminates you
without cause anytime during your employment, you will receive your Base Salary
and health benefits for a period of one year after the date of termination. For
purposes of this commitment, Base Salary will be defined as $147,500 annually.
In addition, for purposes of this obligation, "cause" shall be defined as (i)
any uncured breach of this Letter Agreement that remains uncured after you have
received thirty days prior written notice from Credence; (ii) any attempt by you
to secure personal benefit from the business of the Company except benefit
authorized by the Board of Directors; (iii) any misconduct by you in connection
with your duties hereunder, if, as a result of the misconduct, the business or
reputation of the Company is adversely affected, or if your ability to perform
your duties is adversely affected; or (iv) your conviction of or entry of a plea
of Nolo Contendre to any crime if it has or may have an adverse effect on the
reputation or business of the Company or your ability to perform your duties.

Credence provides a comprehensive and competitive benefits package, which
includes a group health insurance plan, a Flexible Spending Account Plan, an
Employee Stock Purchase Plan and a 401(k) Plan, as outlined in the enclosed
information. Credence also provides a biweekly 401(k) match for those employees
who make contributions to the 401(k) plan.

Please note that this offer is also contingent upon your execution of Credence's
Proprietary Information and Inventions Agreement.

This offer, if accepted, supercedes any other representation or agreement
relating to your employment that either the Company or Integrated Measurement
Systems, Inc. may have made to or with you, including without limitation your
Employment Agreement, dated May 10, 1995. This offer is open for five days from
the date of this letter. If you accept this offer, the terms of employment
described in this letter shall constitute the entire agreement between you and
Credence. Any modification or alteration of the at-will term of your employment
may only be made in writing, signed by you and me.

Fred, I believe you will be a valuable addition to my staff and hope that you
are as pleased in joining Credence as I am in welcoming you. I look forward to
our mutual success and growth.

<PAGE>

Sincerely,

/s/ Graham Siddall
Graham Siddall
Chairman and Chief Executive Officer

ACCEPTED  /s/ Fred Hall                     DATE______________________
          --------------------------

*Please sign and date above and send one copy to Paula Facka, Human Resources,
Credence Systems Corporation,215 Fourier Avenue, Fremont, CA 94539. Please
retain the other copy for your records<PAGE>

                                                                   Exhibit 10.39

                          CREDENCE SYSTEMS CORPORATION
                               215 Fourier Avenue
                               Freemont, CA 94539

                                January 15, 2002

Mr. Fred Hall

Dear Fred:

     Reference is made to your employment offer letter, dated October 1, 2001
(the "Employment Offer Letter"), by and between you and Credence Systems
Corporation (the "Company").

     For good and valuable consideration, receipt of which is hereby
acknowledged, the parties agree that notwithstanding the terms of the Employment
Offer Letter or the relevant stock option agreements, to the extent that you are
terminated "without cause" as described in your Employment Offer Letter, the
final exercise date of any options which you are vested in pursuant to the terms
of the Employment Offer Letter or the relevant stock option agreement on the
date of such termination shall be extended until the earlier of (i) the
                                                     -------
expiration of the option term or (ii) the end of the twelve (12) month period
following the date of such termination.

     Please indicate your acceptance of the foregoing by signing the enclosed
copy of this letter and returning it to the Company.

                                                 Very truly yours,

                                                 /s/ Graham J. Siddall
                                                 ---------------------
                                                 Graham J. Siddall
                                                 Chief Executive Officer and
                                                 Chairman of the Board

ACKNOWLEDGED AND AGREED:

/s/ Fred Hall
-------------
Fred Hall

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00033-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00033-of-00352.parquet"}], [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00033-of-00352.parquet"}]]