This document contains the four keynote papers from ICCE/ICCAI 2000 (International Conference on Computers in Education/International Conference on Computer-Assisted Instruction). "Using Technologies To Model Student Problem Spaces" (David Jonassen) contrasts examples of semantic network, expert system, and systems modeling representations of problems and presents a research agenda for examining the efficacy of these tools. "Millennium eLearning: The Next Killer Application: Implications for Educators and Information Professionals" (Ching-Chih Chen) describes the millennium eLearning development, particularly in the United States, and discusses related problems and issues. "Social and Technological Innovations for a Knowledge Society" (Marlene Scardamalia) discusses core facets of knowledge creation, knowledge building technology, and knowledge building social structures. "Computer-Based Strategies for Articulate Reflection (and Reflective Articulation)" (John Self, Erol Karakirik, Ah-Lian Kor, Patricia Tedesco, and Vania Dimitrova) discusses reasons for the increased emphasis on learning systems providing an environment not just for practice, but also for articulation and reflection. Strategies for promoting articulate reflection are illustrated with reference to five systems. (MES)