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The July 2007 revision of Government Auditing Standards supersedes the 2003 revision and updates the January 2007 revision. The July 2007 revision represents the complete 2007 revision of Government Auditing Standards, and is the version that should be used by government auditors until further updates and revisions are made. An electronic version of this document can be accessed on GAO's Yellow Book Web page at http://www.gao.gov/govaud/ybk01.htm.

The July 2007 revision of Government Auditing Standards will be effective for financial audits and ttestation engagements for periods beginning on or after January 1, 2008, and for performance audits beginning on or after January 1, 2008. Early implementation is permissible and encouraged. For financial audits, certain standards of the Auditing Standards Board (ASB) that affect Government Auditing Standards become effective prior to these dates.