3Johnson, D. W, Johnson, R. Cooperation and competition:Theory and research, Edina, MN: Interaction Book Company (1989).
4Singhanayok, C, Hooper, S. "The Effects of Cooperative Learning and Learner Control on Students' Achievement, Option Selections, and Attitudes", ETR & D. Vol. 46, No. 2, 17-33(1998).
5Steeples, C, Mayes, T. A Special Section on Computer-Supported Collaborative Learning, Computers Educ. Vol. 30, No. 3/4, pp219-221(1998).
6Tolmie, A, Boyle, J. Factors Influencing the Success of Computer Mediated Communication (CMC) Environments in University Teaching t a Review and Case Study · Computer &Education, Vo134,119-140 (2000).
7Xiaodong Lin. Reflective Adaptation of a Technology Artifact : A Case Study of Classroom Change, Cognition and Instruction, Vol. 19, No. 4, 395-440 (2001).
