A section of the Social Security Amendments of 1972, which authorizes the Secretary of HEW to undertake, with respect to Medicare, studies, experiments or demonstration projects on: prospective reimbursement of facilities, ambulatory surgical centers (surgicenters), intermediate care and homemaker services (with respect to the extended care benefit under Medicare); elimination or reduction of the three-day prior hospitalization requirement for admission to a skilled nursing facility; determination of the most appropriate methods of reimbursing the services of physicians’ assistants and nurse practitioners; provision of day care services to older persons eligible under Medicare and Medicaid; and possible means of making the services of clinical psychologists more generally available under Medicare and Medicaid. Studies, experiments and demonstration projects are now in progress in most of these areas.