2Spiro R J,Jehng J.Cognitive flexibility and hypertext:Theory and technology for the nonlinear and multidimensional traversal of complexes subject matter[M]//IN D Nix,R J Spiro Cognition,education and multimedia:Exploring ideas in high technology,1990.
4Jehng J J.The Psycho-social processes and cognitive effects of peer-based collaborative interaction with computers[J].Journal of Educational Computing Research.1997,17 (11):19-46.