This document contains the proceedings of the 22nd annual meeting of the North American Chapter of the International Group for the Psychology of Mathematics Education held October 7-10, 2000, in Tucson, Arizona. Selected papers include: (1) "Dealing with Complexity: New Paradigms for Research in Mathematics Education" (Richard Lesh); (2) "Algebra Reasoning in Elementary Mathematics--Theory and Practice" (Euginio Filloy and Teresa Rojano); (3) "Portrait of the Construction of Mathematical Knowledge: The Case of a Deaf and Blind University Student" (Christine L. Ebert); (4) "Preparing to Teach in the New Millennium: Algebra through the Eyes of Preservice Elementary and Middle School Teachers" (Joyce Bishop and Sheryl Stump); (5) "Teachers' Perspectives on Performance Assessment" (Richard S. Kitchen); (6) "Mathematical Explanations: In-Action and as Re-Presentation" (L. Gordon Calvert); (7) "Growing Mathematical Understanding: Layered Observations" (Jo Towers, Lyndon Martin, and Susan Pirie); (8) "Modeling the Development of the Concept of Function" (Mindy Kalchman and Robbie Case); (9) "Student Conjectures in Geometry" (Anderson Norton); (10) "Young Children's Statistical Thinking: A Teaching Experiment" (Arsalan Wares, Graham A. Jones, Cynthia W. Langrall, and Carol A. Thornton); (11) "Symbols and Meanings in Teacher-Student Interaction During Mathematical Problem Solving" (Olive Chapman); (12) "Prospective Teachers' Part-Whole Division Problem Solution Strategies" (Walter E. Stone, Jr.); (13) "Epistemological Analyses of Mathematical Ideas: A Research Methodology" (Patrick W. Thompson and Luis A. Saldanha); (14) "Parents as Learners of Mathematics: A Different Look at Parental Involvement" (Marta Civil, Rosi Andrade, and Cynthia Anhalt); (15) "Teacher Change in the Context of Cognitively Guided Instruction: Cases of Two Novice Teachers" (Nancy Nesbitt Vacc, Anita H. Bowman, and George W. Bright); (16) "Thought and Action in Context: An Emerging Perspective of Teacher Preparation" (Sarah B. Berenson and Laurie O. Cavey); (17) "Models of Curriculum Use in the Context of Mathematics Education Reform" (Miriam Gamoran Sherin and Corey Drake); (18) "Students Exploring Geometrical Concepts Using Teachers' Web Pages" (Armando L. Bezies); and (19) "Integers versus Fractions: A Study with Eighth Grade Students" (Aurora Gallardo and Rogelio Novoa). (ASK)