Policy Memorandum: Model Plan for Administrative Naturalization Ceremonies; Adjudicator's Field Manual (AFM) Update AD 10-53 [open pdf - 299KB]
"This policy memorandum describes the Model Plan for Administrative Naturalization Ceremonies. It supersedes several earlier memoranda specified below. [...] On October 1, 1991, the Immigration Act of 1990 (IMMACT 1990) extended the authority to naturalize individuals to the Attorney General, and that authority now belongs to the Secretary of the Department of Homeland Security. Under the Secretary's authority, USCIS [U.S. Citizenship and Immigration Services] organizes and oversees administrative naturalization ceremonies designed to welcome new citizens, recognize the value of citizenship, and offer participants practical information about the rights and responsibilities associated with United States citizenship."
Policy Memorandum: PM-602-0014
U.S. Citizenship and Immigration Services: http://www.uscis.gov/