basically, a system of coordinated services should be established in every state, funded by state and federal resources. from a historical view point, several studies (see e.g., Leithwood & montgomery's 1982 review) indicate that in many schools the principal has played a key role as the curriculum gatekeeper. If the principal supports a curriculum change and works closely with governmental agencies, the process moves along well. If the principal opposes the change, major problems develop: meetings are canceled, requisitions are delayed, and space is unavailable. Central office supervisors who try to impose curriculum changes on resistant principals soon discover the folly of such attempts.