Exhibit 31.2

CERTIFICATION

I, Ben W. Perks, Executive Vice President and Chief Financial Officer of Navigant
Consulting, Inc. (the Company), certify that:



|1. | I have reviewed this Annual Report on Form 10-K of the Company;
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|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;
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|3. | Based on my knowledge, these financial statements, and other financial information included in this report, fairly present, in all material respects, the financial condition,
results of operations and cash flows of the Company as of and for the periods presented in this report;
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|4. | The Company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)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Company and have:
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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 Company, 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) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of
financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the Companys disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures as of the end of the period covered by
this report based on such evaluation; and

d) disclosed in this report any change in the Companys internal control over financial
reporting that occurred during the Companys most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the Companys internal control over financial reporting.



|5. | The Companys other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Companys independent
accountants and the Audit Committee of the Companys Board of Directors:
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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 Company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 Companys internal control over
financial reporting.



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|/s/    BEN W. PERKS                                                                   
|Ben W. Perks Executive Vice President and Chief Financial Officer Date: March 14, 2006