A process whereby a program of study or an institution is recognized by an external body as meeting certain predetermined standards. For facilities, accreditation standards are usually defined in terms of physical plant, governing body, administration, and medical and other staff. Accreditation is often carried out by organizations created for the purpose of assuring the public of the quality of the accredited institution or program. The state or federal governments can recognize accreditation in lieu of, or as the basis for licensure or other mandatory approvals. Public or private payment programs often require accreditation as a condition of payment for covered services. Accreditation may either be permanent or may be given for a specified period of time.