3Osearson, M. Self-assessment of Language Proficiency: Ration- ale and Applieations[J]. Language Testing, 1989,6 ( 1 ) : 1-13.
4Boud,D.& Falehikov. N. Quantitative Studies of Self-assess- ment in Higher Education: A Critical Analysis of Findings [J]. Higher Education, 1989 (18) : 529-549.
5Boud, D Enhancing Learning Through Sel f-assessment[M]. London; Kegan Page, 1995 : 5.
6Knowles M S. Self-directed Learning : A Guide for Learners and Teachers [M]. New York: Association Press, 1975: 234- 245.
7Holec H.Autonomy and Foreign Language Learning[]..1981