The purpose of grants-in-aid made under this act shall be: (a) To encourage the development of local community initiative in establishing, maintaining, and operating community based group boarding homes for children and youth or community based services for children and youth; (b) to maintain minimum standards for the operations of such programs; (c) to review the experience of individual programs as they develop; (d) to foster the progress of community based group boarding homes for children and youth and community based services to children and youth to successively higher levels of quality and service.