This document contains the following full and short papers on cognition and conceptual change from ICCE/ICCAI 2000 (International Conference on Computers in Education/International Conference on Computer-Assisted Instruction): (1) "A Method of Creating Counterexamples by Using Error-Based Simulation" (Tomoya Horiguchi and Tsukasa Hirashima); (2) "An Interactive Game System To Stimulate Word Associations" (Naoko Nitsu, Takeyuki Kojima, Bipin Indurkhya, and Yoshiyuki Kotani); (3) "Applied the Gray Relationship Matrix and Learning Obstacles Analysis on the Discovery Teaching" (Chao-Fu Hong, En-Yih Jean, Pei-Chin Wu, Chien-Miing Lia, and Tsai-Hsia Wu); (4) "Collaborative Learning vs. Cognition" (Madhumita Bhattacharya); (5) "Impacts of Unintellect Factors on the Design of CAI Courseware" (Xiaohua Yu and Qinzhu Zhang); (6) "Towards a Meta-Knowledge Agent: Creating the Context for Thoughtful Instructional Systems" (Elspeth McKay); (7) "Microgenetic Analysis of Conceptual Change in Learning Basic Mechanics" (Gary Chon-Wen Shyi and Shih-Tseng Tina Huang); (8) "Scientific Revolutions and Conceptual Change in Students: Results of a Microgenetic Process Study" (Benson M. H. Soong and Yam San Chee); (9) "The Effect of Virtual Reality Learning Transfer with Different Cognitive Style" (Jia-Rong Wen and Li-Ling Hsu); (10) "The Externalization Support System of Self-Explanation for Learning Problem-Solving Process" (Kazuhide Kanenishi, Takahiko Mendori, Masafumi Sawamatsu, and Yoneo Yano); and (11) "The Use of Animation as a Tool for Concept Learning" (Hung-Liang Lee). (MES)