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Exhibit 31

Certification of 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, Thomas M. Donnelly, 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:



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| | (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;          
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| | (b) [Paragraph omitted in accordance with SEC transition instructions]                                                                                                                                                                                                                                                                                                                     
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| | (c) 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                                                                                                     
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| | (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):



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| | (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
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| | (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: August 14, 2003

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| | ---------------------- | --------------------------------------------------------
| | /s/ Thomas M. Donnelly |                                                         
| |                        | Thomas M. Donnelly
President and
Chief Financial Officer