**EXHIBIT 31.1** **CHIEF    EXECUTIVE OFFICER CERTIFICATION**     I, Mitchell C. Hill, Chief Executive Officer of Avanade Inc.    (the “Registrant”), certify that:     1.     I have reviewed the Registrant’s Quarterly Report on    Form 10-Q    for the period ended March 31, 2006, as filed with the    Securities and Exchange Commission on the date hereof;     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 period presented in this quarterly report;     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 report is being prepared;      b)     Evaluated the effectiveness of the Registrant’s disclosure    controls and procedures and presented in this quarterly report    our conclusions about the effectiveness of the disclosure    controls and procedures, as of the end of the period covered by    this quarterly report based on such evaluation; and      c)     Disclosed in this quarterly report any change in the    Registrant’s internal control over financial reporting that    occurred during the Registrant’s most recent fiscal quarter    that has materially affected, or is reasonably likely to    materially affect, the Registrant’s internal control 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 Registrant’s board of    directors (or persons performing the equivalent functions):      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 controls over financial reporting.     Dated: May 15, 2006     /s/  Mitchell C. Hill    Mitchell C. Hill    Chief Executive Officer