This two-volume document provides the proceedings of a conference on the psychology of mathematics education. Plenary session themes were "Diversity and Equity," (with papers by Gilah Leder; Walter Secada; and Ubiratan D'Ambrosio), "Teacher Education," (with a paper by Thomas Cooney), and "Technology" (with papers by Jere Confrey; Sharon Dugdale; Celia Hoyles and Richard Noss; and Carolyn Kieran, Maurice Garancon, Lesley Lee, and Andre Boileau). The 2 volumes also contain 59 research papers, 45 short orals, and descriptions of 6 posters and 14 discussion groups presented at the conference. The research papers are organized into the following categories: (1) Advanced Mathematical Thinking; (2) Algebraic Thinking; (3) Assessment and Evaluation; (4) Epistemology and Cognitive Processes; (5) Functions and Graphs; (6) Language and Mathematics; (7) Modeling; (8) Number and Proportion; (9) Probability and Statistics; (10) Problem Solving; (11) Social and Cultural Factors Affecting Learning; (12) Students' Beliefs and Attitudes; (13) Teacher Education; and (14) Teachers' Beliefs and Attitudes. A list of authors and committee members is included at the end of volume 2. (MKR)