4Wenger, E. Community of Practice : Learning, meaning and identity [M]. Cambridge University Press, 1998.
5David H. Jonassen & Susan M. Land. Theoretical Foun- dations of Learning Environmens [M]. Lawrence Erlbaum Associates, Inc. 2000: 37.
6Waibel-Fischer M, Dick M, Wehner T. Local knowledge in activity systems: the socio-cuhural perspective of knowl- edge development [J]. European perspectives on learning at work : the acquisition of work process knowledge. Cedefop Reference Series, 2004 (56) : 71 - 95.
7David H. Jonassen & Susan M. Land, Theoretical Foundations of Learning Environmens. Lawrence Erlbaum Associates, Inc. 2000: 37.
