Corcoran, Thomas B.2023-05-222023-05-221995-06-012015-09-02https://repository.upenn.edu/handle/20.500.14332/8323This brief from 1995 reviews what was known about professional development. The brief discusses its organization, costs, and effects on practice. It also suggests some principles to guide professional development in the future and offers a framework for designing and assessing policies and programs.Curriculum and InstructionEducation PolicyTeacher Education and Professional DevelopmentBrief