Discusses how to develop teacher subject knowledge for effective delivery of the program of study at the primary level. Indicates that providing teachers with the necessary skills and confidence is complex. Contains 27 references. (DDR)

Explores high school students' and preservice teachers' knowledge of light, vision, and related topics before and after commonly practiced instruction. Suggests a hierarchical structure to represent the collective conceptual knowledge of students and teachers in terms of facets and schemes of knowledge. Makes suggestions for designing instruction…