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EXHIBIT 31.1 CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO SECTION 302
OF THE SARBANES-OXLEY ACT OF 2002 I, David Mitchell, President and Chief Executive Officer of webMethods, Inc., have executed this
certification in connection with the filing with the Securities and
Exchange Commission of the registrants Amendment No. 2 to Form 10-K for the fiscal year ended March 31, 2004. I certify that:  1.
    I have reviewed this Amendment No. 2 to Form 10-K of webMethods, Inc.;2.
    Based on my knowledge, this Amendment No. 2 to Form 10-K 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 Amendment No. 2 to Form 10-K;3.
    Based on my knowledge, the financial statements, and other financial
information included in this Amendment No. 2 to Form 10-K 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
Amendment No. 2 to Form 10-K;4.
    The registrants other certifying officer and I are 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 our
supervision, 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 Amendment No. 2 to Form 10-K is being prepared;(b)
    evaluated the effectiveness of the registrants disclosure controls
and procedures and presented in this Amendment No. 2 to Form 10-K our conclusions about the
effectiveness of the disclosure controls and procedures as of the end
of the period covered by this Amendment No. 2 to Form 10-K based on such evaluation; and(c)
    disclosed in this Amendment No. 2 to Form 10-K any change in the registrants internal
controls over financial reporting that occurred during the
registrants most recent fiscal quarter (the registrants fourth
quarter in the case of an annual report) that has materially affected,
or is reasonably likely to materially affect, the registrants
internal controls over financial reporting; and  5.
    The registrants other certifying officer and I have disclosed, based
on our 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 fulfilling the equivalent
function):  (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:
February 14, 2005/s/
DAVID MITCHELLName: David MitchellTitle: President and Chief Executive Officer