Began to change in the late 1960’s with the introduction of McMaster University’s new approach to medical education. This moment in history has changed the way many medical schools all over the world design 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.