<PAGE>

                                                         EXHIBIT 31.1


                       CERTIFICATION PURSUANT TO
                            SECTION 302 OF
                     THE SARBANES-OXLEY ACT OF 2002


I, Charles R. Kokesh, President, Chief Executive Officer, Chief
Financial Officer and Chairman of Technology Funding Inc. and Managing
General Partner of Technology Funding Ltd., certify that:

1. I have reviewed this quarterly report on Form 10-Q of Technology
Funding Partners IV, An Aggressive Growth, L.P.;
2. Based on my knowledge, this quarterly 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 quarterly report;
3. Based on my knowledge, the financial statements, and other
financial information included in this quarterly 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 quarterly report;
4. I am 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 is made known to me by
others within the entity, particularly during the period in which this
quarterly 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 quarterly report (the Evaluation Date); and
c) presented in this quarterly report my conclusions about the
effectiveness of the disclosure controls and procedures based on my
evaluation as of the Evaluation Date;
5. I have disclosed, based on my most recent evaluation, to the
registrant's auditors and the audit committee of registrant's board of
directors (or persons performing the equivalent function):
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 significant role in the registrant's
internal controls; and
6. I have indicated in this quarterly report whether or not there were
significant changes in internal controls or in other factors that
could significantly affect internal controls subsequent to the date of
my most recent evaluation, including any corrective actions with
regard to significant deficiencies and material weaknesses.

Date:  May 9, 2006             By:     /s/Charles R. Kokesh
                               --------------------------------
                                     Charles R. Kokesh
                                     President, Chief Executive
                                     Officer, Chief Financial
                                     Officer and Chairman of
                                     Technology Funding Inc. and
                                     Managing General Partner of
                                     Technology Funding Ltd.


Technology Funding Partners IV, L.P.
(a Delaware limited partnership)

Page 1 of 2