Began to change in the late 1960’s with the introduction of McMaster University’s new approach to medical education. and implement their curricula. PBL was thought to provide a method for students to integrate knowledge across subject boundaries and to develop problem-solving skills. To provide medical students receive integrated knowledge. To develop and apply their skills to solve problems with patients. structuring of knowledge in clinical contexts, clinical reasoning, self-directed learning skills and intrinsic motivation (Barrows, 1980). McMaster University was the first Canadian Medical School to adopt this model.