The aim of this study was to obtain insight into the effect of a quality assurance system on the implementation of a PBL teaching strategy in courses in three Hong Kong universities. A total of nine research teams (each consisting of a few PBL-tutors) were involved. Before the implementation of PBL, the tutors attended specific orientation and training sessions on PBL. Twenty-one tutors were randomly selected for interview after the implementation. The results indicate that the quality assurance system within most institutions does affect the implementation of PBL. The reliance on research output and a standardised student feedback questionnaire as indicators of staff performance do have a detrimental effect on the implementation of PBL. On the other hand, resources and class size also have a direct effect on the willingness of academic staff adopt the PBL approach in teaching. Finally, student factors also play an important role in the successful implementation of PBL. To be successful PBL tutors need to be supported by a clear message from the university quality assurance system that this is the way to go forward. Without taking this seriously into consideration, one could predict serious difficulties in promoting PBL in the education sector.