4Céline Buchs,Fabrizio Butera. Complementarity of Information and Quality of Relationship in Cooperative Learning[J] 2001,Social Psychology of Education(3-4):335～357
8Chen Q,Liu R,Zhang J.Creating a constructive environment for learners to explore word problem solving[C].In:International Conference on Computers in Education,Beijing,1998
9Cerardo A.A collaborative Learning environment based on intelligent agents[J].Expert Systems with Applications,1998; 14(1-2):129～137
10Bruce M E,Chan L K S.Co-operative learning in integrated classroom[J].Curriculum and Teaching,1991 ;6(1):48～52
