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                                                                    EXHIBIT 31.1

           PRINCIPAL EXECUTIVE OFFICER AND PRINCIPAL FINANCIAL OFFICER
   REQUIRED BY RULE 13A-14(a) OR RULE 15D-14(a) OF THE SECURITIES EXCHANGE ACT
  OF 1934, AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Nigel P. Ekern, certify that:

1.  I have reviewed this quarterly report on Form 10-Q of Net Perceptions, Inc.;

2.  Based on my knowledge, this 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 report;

3.  Based on my knowledge, the financial statements, and other financial
information included in this 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 report;

4.  I am responsible for establishing and maintaining disclosure controls and
procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the
registrant and have:

         (a) Designed such disclosure controls and procedures, or caused such
         disclosure controls and procedures to be designed under my supervision,
         to ensure that material information relating to the registrant,
         including its consolidated subsidiaries, is made known to me by others
         within those entities, particularly during the period in which this
         report is being prepared;

         (b) Evaluated the effectiveness of the registrant's disclosure controls
         and procedures and presented in this report my conclusions about the
         effectiveness of the disclosure controls and procedures, as of the end
         of the period covered by this report based on such evaluation; and

         (d) Disclosed in this report any change in the registrant's internal
         control over financial reporting that occurred during the registrant's
         most recent fiscal quarter (the registrant's fourth fiscal quarter in
         the case of an annual report) that has materially affected, or is
         reasonably likely to materially affect, the registrant's internal
         control over financial reporting; and

5.  I have disclosed, based on my most recent evaluation of internal control
over financial reporting, to the registrant's auditors and the audit committee
of the registrant's board of directors (or persons performing the equivalent
functions):

         (a) All significant deficiencies and material weaknesses in the design
         or operation of internal control over financial reporting which are
         reasonably likely to adversely affect the registrant's ability to
         record, process, summarize and report financial information; and

         (b) Any fraud, whether or not material, that involves management or
         other employees who have a significant role in the registrant's
         internal control over financial reporting.

Date:  November 15, 2004

                                                /s/ Nigel P. Ekern
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                                                Nigel P. Ekern
                                                Chief Administrative Officer
                                                (Principal Executive Officer
                                                and Principal Financial Officer)
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