Administrative Appeals Office (AAO) Practice ManualAAO conducts administrative review of U.S. Citizenship and Immigration Services (USCIS) officers’ decisions regarding immigration benefit requests. Manual describes rules, procedures, and recommendations for practice before the AAO. Keyword search function, table of contents, and links to relevant primary authority. Citations to statutes, regulations, case law, authoritative sources, and other explanatory references generally appear in footnotes rather than the body of the text.