6Jonassen, D. & Rohrer-Murphy, L. Activity theory as a framework for designing coastmctivist learning environment[J].Educational Technology, Re.search and Devdopment, 1999, 47(1) :61-79.
7Barab, S., Schatz, S & Scheckhr, R. Using activity theory to conceptualize online community and using using online community to conceptualize activity theory[J]. Mind, Culture and Activity, 2004, 4(3) : 149-158.
8Leont'ev, A. N. The problem of activity in psychology[J]. Soviet Psychology, 1974, 13(2):4-33.
9Shee, D. Y. & Wang, Y-S. Multi-criteria evaluation of the web-based e-learning system: A methodology based on learner satisfaction and its applications[J]. Computers & Education, 2008, 50(3):894-950.
10Hasan, H. & Crawford, K. Codifying or enabling: The challenge of knowledge management systems[J]. The Journal of the Operational Research Society, 2003, 54(2) : 184-193.