3Das M, Mpofu D, Dunn E, et al. Self and tutor evaluations in problem-based learning tutorials: is there a relationship? [J] Med Educ, 1998,32:411-418.
4Dodds AE, Osmond RH, Elliott SL. Assessment in problembased learning: the role of the tutor [J ]. Ann Acad Med Singapore, 2001,30(4): 366 - 370.
5Caplow JA, Donaldson JF, Kardash C, et al. Learning in a problem-based medical curriculum: students' conceptions [J ]. Med Educ, 1997, 31(6) :440 - 447.
6Houlden RL, Collier CP, Frid PJ, et al. Problems identified by tutors in a hybrid problem-based learning curriculum [J]. Acad Med, 2001,76(1) :81.
7Menahem S, Paget N. Role play for the clinical tutor: towards problem-based learning [J ]. Med Teach, 1990, 12( 1 ): 57 - 61.
8Perterson M. Skills to enhance problem-based learing [J ]. Med Educ Online [ serial online], 1997, 2: 3. Available from: URL http://www. utmb. edu/meo/.