2Hmelo, C. E. &Ferrari. The problem-based learning tutorial: Cultivating higher order thinking skills.Journal of the education of the gifted, 1997(4):401-422.
3Problem-based learning,especially in the context of large classes [ EB/OL ] .http://www.chemeng.mcmaster.ca/pbl/pbl,htm.
4what is PBL? [EB/OL].http://edweb.sdsu.eduMrit/learning resource/ PBL/what is PBL.html.
6PBL2002组委会Univ.of Delaware.An international conference on Problem Based Learning [EB/OL]. http://www.udel.edu/ce/pbl2002/index.html, 2002-09.
7Woei Huang.The 3C3R Model-A Conceptual Framework for Designing Problems in PBL [J]. The Interdisciplinary Journal of Problem- based Learning, 2006, 1(1) :55-77.
