2Alan B & Stoller F L. Maximizing the benefits of project work in foreign language classrooms [ J ]. English Teaching Forum, 2005, 43(4) : 10-21.
3Buck Institute for Education. What Is PBL? [ EB/OL]. http ://www. bie. org/about/What_is_Pbl, 2010.
4Krashen S. The Input Hypothesis: Issues and Implications [ M ]. London: Longman, 1985.
5Markham T, Lanner J & Ravitz J. Project Based Learning Handbook: A Guide to Standards-focused Project Based Learning (2nd Ed. ) [ M]. Novato, California: Buck Institute for Education, 2003.
6Stoller F L. Project work: A means to promote language and content [ J]. English Teaching Forum, 1997, 35(4): 2-9, 37.
7Thomas J. A Review of Research on Project-based Learning [ EB/OL]. http://citeseerx, ist. psu. edu/viewdoc/ download? doi= 10.1.1. 148. 263&rep=repl&Type=pdf, 2000.
8Thomas R W & McGregor S K. Online project-based learning: How collaborative strategies and problem solving processes impact performance [ J ]. Journal of Interactive Learning Research, 2005, 16 (1) : 83-107.
