**Exhibit 31.1**

 

CERTIFICATION PURSUANT TO RULES 13a-14(a) AND 15d-14(a)

UNDER THE SECURITIES EXCHANGE ACT, AS AMENDED

 

I,Jerre L. Stead, certify that:

 

1.I have reviewed this Amendment No. 1 to the quarterly report on Form 10-Qof IHS Inc.;

 

2.Based on my knowledge, this report does not contain any untrue statement of amaterial fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances under which such statements were made, notmisleading with respect to the period covered by this report;

 

3.[This certification is intentionally omitted because this Amendment No. 1to the quarterly report on Form 10-Q/A does not contain financialstatements or other financial information.];

 

4.The registrant’s other certifying officer and I are responsible forestablishing and maintaining disclosure controls and procedures (as defined inExchange Act Rules 13a-15(e) and 15d-15(e)) and internal control overfinancial reporting (as defined in Exchange Act Rules 13a-15(f) and15d-15(f)) for the registrant and have:

 

a) Designed such disclosure controls and procedures,or caused such disclosure controls and procedures to be designed under oursupervision, to ensure that material information relating to the registrant,including its consolidated subsidiaries, is made known to us by others withinthose entities, particularly during the period in which this report is beingprepared;

 

b) Designed such internal control over financialreporting, or caused such internal control over financial reporting to bedesigned under our supervision, to provide reasonable assurance regarding thereliability of financial reporting and the preparation of financial statementsfor external purposes in accordance with generally accepted accounting principles;

 

c) Evaluated the effectiveness of the registrant’sdisclosure controls and procedures and presented in this report our conclusionsabout the effectiveness of the disclosure controls and procedures, as of theend of the period covered by this report based on such evaluation; and

 

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

 

5.The registrant’s other certifying officer and I have disclosed, based on ourmost recent evaluation of internal control over financial reporting, to theregistrant’s auditors and the audit committee of the registrant’s board ofdirectors (or persons performing the equivalent functions):

 

a) All significant deficiencies and materialweaknesses in the design or operation of internal controls over financialreporting which are reasonably likely to adversely affect the registrant’sability to record, process, summarize and report financial information; and

 

b) Any fraud, whether or not material, that involvesmanagement or other employees who have a significant role in the registrant’sinternal control over financial reporting.

 

Date:July 28, 2009

 
| /s/  Jerre L. Stead                   |   |
|---------------------------------------|--------|
| Jerre  L. Stead                       |   |
| Chairman  and Chief Executive Officer |   |

 

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