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It is argued that problems encountered in educational practice usually stem from poor implementation of PBL. In many cases the way in which PBL is implemented is not consistent with the current insights on learning. Furthermore, it is argued that research on PBL should contribute towards a better understanding of why and how the concepts of constructive, self-directed, collaborative and contextual learning work or do not work and under what circumstances. Examples of studies are given to illustrate this issue.
Dolmans et al. (Thu,) studied this question.