Preface; Research in a Pioneer Constructivist Network-based Curriculum Project for Children's Learning of Fractions. Sharon Dugdale; The Development of a Dynamical Geometry Environment: Cabri-geometre. Colette Laborde and Jean-Marie Laborde; What Lies Behind Dynamic Interactive Geometry Software. E. Paul Goldenberg, Daniel Scher, and Nannette Feurzeig; From Network to Microcomputers and Fractions to Functions: Continuity in Software Research and Design. Sharon Dugdale; Linking Research and Software Development. Julie Sarama and Douglas H. Clements; Development of the Shape Makers Geometry Microworld: Design Principles and Research. Michael T. Battista; Integrating Intelligent Software Tutors with the Mathematics Classroom. Steven Ritter, Lisa Haverty, Kenneth R. Koedinger, William Hadley, and Albert T. Corbett; Research-Design Interactions in Building Function Probe Software. Jere Confrey and Alan Maloney; Changing Representational Infrastructures Changes Most Everything: The Case of SimCalc Algebra and Calculus. Jim Kaput and Roberta Schorr; Multiple Representations and Local Linearity - Research Influences on the Use of Technology in Calculus Curriculum Reform. Thomas P. Dick and Barbara S. Edwards; The Research Frontier: Where Technology Interacts with the Teaching and Learning of Data Analysis and Statistics. Susan N. Friel; Keeping the Faith: Fidelity in Technological Tools for Mathematics Education. Thomas P. Dick; Representations and Cognitive Objects in Modern School Geometry. Michael T. Battista; From Artifacts to Instruments: A Theoretical Framework Behind the Orchestra Metaphor. Paul Drijvers and Luc Trouche; Designing Tasks for the Co-development of Conceptual and Technical Knowledge in CAS Activity: An Example from Factoring. Carolyn Kieran and Luis Saldanha; Teacher Education: Technology's Conduit to the Classroom. Patricia S. Wilson; Perspectives on Research, Policy, and the Use of Technology in Mathematics Teaching and Learning. Joan Ferrini-Mundy and Nancy Nelson Knupfer; The Role of Research, Theory, and Practice in the Integration of Technology in Mathematics Teaching and Learning. M. Kathleen Heid and Glendon W. Blume.