The Mathematics Teacher Preparation Content Workshop, held March 19-21, 1999, focused on two questions: (1) What is the mathematical knowledge teachers need to know in order to teach well? and (2) How can teachers develop the mathematical knowledge they need to teach well? Chapters include: (1) "Knowledge of Fundamental Mathematics for Teaching" (Liping Ma and Cathy Kessel); (2) "Elementary Teachers and Essential Mathematical Knowledge" (Mark Saul); (3) "What Is Fundamental Mathematics?" (Genevieve Knight); (4) "What Mathematical Knowledge Is Entailed in Teaching Children to Reason Mathematically?" (Deborah Loewenberg Ball and Hyman Bass); (5) "Reaction to the Presentation by Deborah Ball and Hyman Bass" (James Lewis); (6) "Analyzing Student Thinking" (Virginia Bastable); (7)"Remodeling Mathematical Tasks" (Olga G. Torres); (8) "Analyzing Student Work" (Michaele F. Chappell); (9) "Managing Class Discussion" (Erick Smith); (10) "Perspectives from a Mathematician" (Alan Tucker); (11) "Perspectives from a Mathematics Educator" (Deborah Schifter); (12) "Perspectives from the Community College" (Gladys Whitehead); (13) "Student Curriculum Materials: Japanese Teachers' Manuals" (Shin-ying Lee); (14) "Student Curriculum Materials: Investigations in Number, Data, and Space" (Marco Ramirez); (15) "Case Materials" (Carne Barnett); (16) "Programs and Practices" (Deborah Schifter, Virginia Bastable, and Jill Bodner Lester); (17) "Video as a Delivery Mechanism" (Bradford Findell and Deborah Loewenberg Ball); (18) "Looking at Textbooks" (Richard Askey); (19) "The Professional Growth of a Classroom Teacher" (Carol Midgett); (20) "The Importance of Mathematical Content" (Alice Gill); (21) "NSF and Teacher Preparation Programs" (James Lightbourne); and (22) "Where Are We? Moderator's Summary" (Joan Ferrini-Mundy). (ASK)