December 17, 2001

Barrett Business Services, Inc.
4724 SW Macadam Avenue
Portland, OR  97201

Dear Mike:

     This letter  amendment (this  "Amendment") is to confirm the changes agreed
upon  between  WELLS  FARGO  BANK,  NATIONAL  ASSOCIATION  ("Bank")  and BARRETT
BUSINESS SERVICES, INC. ("Borrower") to the terms and conditions of that certain
letter agreement  between Bank and Borrower dated as of May 31, 2000, as amended
from time to time (the "Agreement"). For valuable consideration, the receipt and
sufficiency  of which are hereby  acknowledged,  Bank and Borrower  hereby agree
that the Agreement shall be amended as follows to reflect said changes.

     1.  Paragraph V. 13 is hereby  deleted in its  entirety,  and the following
substituted therefor:

               "LOANS, ADVANCES,  INVESTMENTS. Not to make any loans or advances
          to or investments in any person or entity, except loans or advances to
          William  Sheretz in amounts not to exceed an aggregate of  $100,000.00
          outstanding at any one time."

     2. Except as specifically  provided herein, all terms and conditions of the
Agreement remain in full force and effect,  without waiver or modification.  All
terms  defined in the  Agreement  shall have the same  meaning when used herein.
This Amendment and the Agreement shall be read together, as one document.

     3. Borrower hereby remakes all representations and warranties  contained in
the Agreement and reaffirms all covenants set forth  therein.  Borrower  further
certifies that as of the date of Borrower's acknowledgment set forth below there
exists no  default  or  defined  event of  default  under the  Agreement  or any
promissory note or other contract, instrument or document executed in connection
therewith,  nor any  condition,  act or event which with the giving of notice or
the passage of time or both would  constitute such a default or defined event of
default.

UNDER OREGON LAW, MOST  AGREEMENTS,  PROMISES AND COMMITMENTS MADE BY BANK AFTER
OCTOBER 3, 1989 CONCERNING  LOANS AND OTHER CREDIT  EXTENSIONS WHICH ARE NOT FOR
PERSONAL,  FAMILY OR  HOUSEHOLD  PURPOSES  OR SECURED  SOLELY BY THE  BORROWER'S
RESIDENCE MUST BE IN WRITING,  EXPRESS CONSIDERATION AND BE SIGNED BY BANK TO BE
ENFORCEABLE.

     Your  acknowledgement of this Agreement shall constitute  acceptance of the
foregoing terms and conditions.

                                           Sincerely,

                                           WELLS FARGO BANK,
                                                 NATIONAL ASSOCIATION


                                           By:  /s/ Julie Wilson
                                               ---------------------------------
                                           Julie Wilson, Vice President

Acknowledged and accepted as of 12/19/01 :
                                ---------

BARRETT BUSINESS SERVICES, INC.

By: /s/ Michael D. Mulholland
    -----------------------------------
    Michael D. Mulholland, Vice President-Finance