The set of papers collected in this anthology were developed from presentations given at the 16th meeting of the North American Chapter of the International Group for the Psychology of Mathematics Education (PME-NA), November 5-8, 1994, in Baton Rouge, Louisiana. These papers provide conceptual explorations of dimensions of teacher change such as the nature of teachers' mathematical knowledge and its role in informing their instructional options; the role that curricular and other material resources can play in the process of teacher change; and the effect of a new culture for teaching that legitimatizes curiosity, reflection, and critical colleagueship. Chapters contained in this report include: (1) "Learning Mathematics while Teaching" (Susan Jo Russell, Deborah Schifter, Virginia Bastable, Lisa Yaffee, Jill B. Lester, Sophia Cohen); (2) "Teachers' Changing Conceptions of the Nature of Mathematics: Enactment in the Classroom" (Deborah Schifter); (3) "Affective Issues in Developing Mathematics Teaching Practice" (Lynn T. Goldsmith and Linda Ruiz Davenport); (4) "Transforming Mathematics Teaching in Grades K-8: How Narrative Structures in Resource Materials Help Support Teacher Change" (Linda Ruiz Davenport and Annette Sassi); and (5) "Teacher Inquiry Groups: Collaborative Explorations of Changing Practice" (James K. Hammerman). (ASK)