This activity-oriented book for preservice mathematics teachers who are taking methods courses or who have been student teaching offers a framework for teacher reflection and self- assessment. It supplies detailed observation instruments for observing other teachers, reflective activities, and guidelines and instruments for supervisors. There are eight chapters in three parts. Part 1, "Philosophical Basis for the Model," includes (1) "Toward an Understanding of Student-Centered Teaching"; (2) "A Framework for the Examination of Instructional Practice"; (3) "A Framework for the Examination of Teacher Cognition"; and (4) "Putting It All Together." Part 2, "How To Use This Model," includes (5) "Using the Model to Examine the Instructional Practice and Cognitions of Other Teachers"; (6) "Using the Model to Examine Your Own Instructional Practice and Cognitions"; and (7) "Using a Portfolio to Document How You Engage in Self-Assessment and Reflection." Part 3, "Evidence: The Model in Action," includes (8) "Case Studies of the Model in Action: Five Cases." Four appendixes present research results, observation forms, observation charts made by preservice teachers, and guides and forms for supervised observations. (Contains 100 references.) (SM)