In the last 2 decades, federally-funded research has contributed much to the understanding of teaching and learning and the critical nature of teachers' subject-matter knowledge and ability to translate academic content into effective learning activities for students of different developmental levels and backgrounds. Research findings have…

This paper, on the central and distinctive contribution of knowledge to teaching, combines philosophical analysis with a discussion of work in research on teaching, student conceptions, and curriculum. The hierarchical argument contains two main points: (1) that content knowledge is a logical precondition for the activities of teaching; and (2)…