The Uniform Standards of Professional Appraisal Practice (USPAP) are the generally recognized ethical and performance standards for the appraisal profession in the United States. USPAP was adopted by Congress in 1989, and contains standards for all types of appraisal services, including real estate, personal property, business and mass appraisal. Compliance is required for state-licensed and state-certified appraisers involved in federally-related real estate transactions. USPAP is updated every two years so that appraisers have the information they need to deliver unbiased and thoughtful opinions of value.
The Yellow Book is the book of standards and guidance for auditors and audit organizations, outlining the requirements for audit reports, professional qualifications for auditors, and audit organization quality control. Auditors of federal, state, and local government programs use these standards to perform their audits and produce their reports.
Each state (and the Federal Government) has its own statutes governing the use of its eminent domain powers and basis for just compensation. Provided is a link to the Pennsylvania Eminent Domain Code.