GAO Government Auditing Standards (The Yellow Book)Government Auditing Standards (the "Yellow Book") contains standards for audits of government organizations, programs, activities, and functions, and of government assistance received by contractors, nonprofit organizations, and other nongovernment organizations. These standards, often referred to as generally accepted government auditing standards (GAGAS), are to be followed by auditors and audit organizations when required by law, regulation, agreement, contract, or policy.