The best known book in the field, Supervision: A Redefinition is a research-based guide to the practice and philosophy of supervision. Practical applications are supported by a conception of supervision as moral agency, and the book continues to promote a redefinition of supervision from a traditional top-down hierarchy to a shared activity involving all stake-holders in the school--including teachers, administrators, and parents. The eighth edition continues a thirty-plus year tradition of breaking new ground by reconsidering the field of supervision in response to changing school contexts, policies, and realities. The new edition shows even more clearly how the book's ideas can be used to help supervisors improve their effectiveness: practical suggestions abound.