Exhibit 23


Consent of Independent Public Accountants


As independent  public  accountants,  we hereby consent to the  incorporation by
reference  of our  reports  included  in this  Form  10-K,  into  the  Company's
previously filed Registration  Statements:  (1) Registration  Statement File No.
33-40472 on Form S-8 of the 1986 Stock  Option  Plan,  the 1985 Stock  Incentive
Plan,  the 1985 Key  Employee  Incentive  Stock  Option Plan and the  Individual
Written  Compensation  Plan dated May 10, 1991, (2) Registration  Statement File
No.  33-44864 on Form S-8 of the 1986 Restated and Amended Stock Option Plan and
Directors' Stock Option Plan dated January 8, 1992, (3)  Registration  Statement
on Form S-8 of the 1992 Employee  Stock  Purchase Plan dated June 16, 1992,  (4)
Registration  Statement  File No.  33-86548 on Form S-3 dated November 21, 1994,
(5)  Registration  Statement  File No.  33-65463 on Form S-3 dated  December 28,
1995,  as amended on  February  9, 1996,  (6)  Registration  Statement  File No.
333-28565 on Form S-8 of the 1997  Non-Officer  Employee Stock Option Plan dated
June 5, 1997,  as amended on October 29, 1997,  and (7)  Registration  Statement
File No.  333-62523  on Form S-8 of the 1997  Equity  Participation  Plan  dated
August 31, 1998.

                                    /s/ Arthur Andersen LLP




Portland, Oregon
June 25, 2001