- One of the most misunderstood concepts in progressive educational curricula is that of problem-based learning (PBL). Often confused with problem solving, the two are quite different. Courses conducted in a PBL format use problems as a launch pad for resulting study. This article reviews a course designed to enable students to learn and understand the principles of human reproductive physiology using PBL. The learning process is situation based, student directed, and takes place in small groups. The rationale for some of these innovations is discussed and the way in which they were implemented is described.