exv31w1

/s/ Peter Gyenes

Peter Gyenes

Chief Executive Officer

(Principal Executive Officer)

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO RULE 13a-14(a)/
RULE 15d-14(a) OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED
CERTIFICATION

I, Peter Gyenes, certify that:

1. I have reviewed this Annual Report on Form 10-K/A of Ascential Software Corporation;

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. [Intentionally omitted since the information to which this paragraph relates is not included in this Annual Report on Form 10-K/A];

4. [Intentionally omitted since the information to which this paragraph relates is not included in this Annual Report on Form 10-K/A]; and

5. [Intentionally omitted since the information to which this paragraph relates is not included in this Annual Report on Form 10-K/A].

Date: April 22, 2005

1.		I have reviewed this Annual Report on Form 10-K/A of Ascential Software Corporation;

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.		[Intentionally omitted since the information to which this paragraph relates is not included in this Annual Report on Form 10-K/A];

4.		[Intentionally omitted since the information to which this paragraph relates is not included in this Annual Report on Form 10-K/A]; and

5.		[Intentionally omitted since the information to which this paragraph relates is not included in this Annual Report on Form 10-K/A].