It was developed in the late 1960s in medical education to facilitate learning basic science concepts in the context of clinical cases (Box 2). It is today used in most medical schools in the United States and in many other countries around the world (Wood, 2008). Moreover, PBL has been successfully adapted across various disciplines in higher education, including natural sciences, social sciences, or humanities. Schools of architecture, business, law, engineering, forestry, police science, social work, education and many other professional fields have picked up PBL (Ball and Pelco, 2006; Camp, 1996).