The plans for a field test of teaching tenth grade plane geometry through transformations is described. Text and homework materials have been written, and teachers have been trained. Eight intact classes are now being taught utilizing the materials. Data to be collected will include: (1) teacher descriptions of the course via questionnaire; (2)…

The author presents a research-oriented approach to teacher training intended to aid teachers in being able to reason about the content, methods and goals of their teaching activities. The model research procedure is then illustrated by exploring a particular teaching unit in three-dimensional geometry. (MN)