This document contains the full and short papers on collaborative learning from ICCE/ICCAI 2000 (International Conference on Computers in Education/International Conference on Computer-Assisted Instruction) covering the following topics: comparison of applying Internet to cooperative and traditional learning; a distributed backbone system for community-based collaborative virtual universities; a European learning environment; a flexible transaction model for virtual school environments; collaborative teaching for creating learning in an engineering class; the effectiveness of a World Wide Web-based collaborative learning system on school mathematics; an agent-based collaborative learning environment for intelligent tutoring systems (ITS); and agent-oriented support environment in Web-based collaborative learning; the effectiveness of Web-based application for mailing list; implementation of a campus distance learning system using Multicast; analyses of cognitive effects of collaborative learning processes on students' computer programming; building mathematics collaborative learning Web sites; collaborative learning using GSS (Group Support System) on the Internet; design and implementation of cooperative monitoring agent using mobile agent; designing extensible simulation-oriented collaborative virtual learning environments; development of the Web-based classroom system; the gap between the discourse and the application of socio-constructivist principles of pre-service teachers using information and computer technologies; domain specific information clearinghouses; developing successful collaborative projects among European initial teacher education students; evaluating children interacting, collaborating, and learning with computers; group composition methods for cooperative learning in Web-based instructional systems; initial evidence for representational guidance of learning discourse; forming effective collaborative learning groups with ontological engineering; learning protocols for knowledge discovery; supporting semantic indexing in a mediabase system that facilitates collaborative learning; peer help for problem-based learning; promoting student learning and development in computer-based cooperative learning; an XML (eXtensible Markup Language)-based knowledge sharing and management system supporting research activities; a collaborative problem-solving environment for synchronous discussion; scientific revolutions and conceptual change in students; the distance ecological model to support self-collaborative learning in the Internet environment; the impact of learning style on group cooperative learning; the project-based cooperative learning on the Internet; tracking and guiding tools for learning groups in a Web collaborative learning system; and development and evaluation of computer-supported collaborative learning software for teacher education. (MES)