It supplements GAO's Yellow Book (Government Auditing Standards, 1994 Revision), which defines the generally accepted government auditing standards (GAGAS), and replaces the earlier GAO guidance, Assessing the Reliability of Computer-Processed Data (GAO/OP-8.
GAO's Yellow Book defines the generally accepted auditing standards for the government.
Built in the 16th century and formerly the Old Customs House (Alfandega Velha), the oldest parts of this building lie inside the imposing gateway.