Costco 2002 Annual Report Download - page 20

CERTIFICATIONS
I, James D. Sinegal, certify that:
1) I have reviewed this annual report on Form 10-K of Costco Wholesale Corporation.
2) Based on my knowledge, this annual report does not contain any untrue statement of a material fact or omit
to state a material fact necessary to make the statements made, in light of the circumstances under which
such statements were made, not misleading with respect to the period covered by this annual report;
3) Based on my knowledge, the financial statements, and other financial information included in this annual
report, fairly present in all material respects the financial condition, results of operations and cash flows of
the registrant as of, and for, the periods presented in this annual report;
4) The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure
controls and procedures (as defined in Exchange Act Rules 13a-14 and 15d-14) for the registrant and have:
a) designed such disclosure controls and procedures to ensure that material information relating to the
registrant, including its consolidated subsidiaries, is made known to us by others within those entities,
particularly during the period in which this annual report is being prepared;
b) evaluated the effectiveness of the registrant’s disclosure controls and procedures as of a date within 90
days prior to the filing date of this annual report (the “Evaluation Date”); and
c) presented in this annual report our conclusions about the effectiveness of the disclosure controls and
procedures based on our evaluation as of the Evaluation Date;
5) The registrant’s other certifying officers and I have disclosed, based on our most recent evaluation, to the
registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the
equivalent functions):
a) all significant deficiencies in the design or operation of internal controls which could adversely affect
the registrant’s ability to record, process, summarize and report financial data and have identified for
the registrant’s auditors any material weaknesses in internal controls; and
b) any fraud, whether or not material, that involves management or other employees who have a sig-
nificant role in the registrant’s internal controls; and
6) The registrant’s other certifying officers and I have indicated in this annual report whether there were sig-
nificant changes in internal controls or in other factors that could significantly affect internal controls sub-
sequent to the date of our most recent evaluation, including any corrective actions with regard to significant
deficiencies and material weaknesses.
James D. Sinegal
President, Chief Executive Officer
Date: November 22, 2002
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