The Medical Faculty of International Medical University, (IMU) has adopted PBL since it was founded in 1992. A comprehensive monitoring programme on the effectiveness of PBL was initiated recently in IMU to study the students’ perception of PBL. Survey forms were distributed to students who have completed semester 1 (half a year), 3 (one and a half years) and 5(two and a half years) of their medical programme. Feedback was obtained from more than 95% of the students in each semester. Information obtained included the educational background of students, perceived benefits of PBL, participation in PBL and group dynamics, role of the facilitator, the role of PBL in assessment and the average time spent preparing for PBL. This feedback is useful for both the implementers and facilitators, as students have stated reasons for their perception of the PBL programme.