What’s So Good About Problem-Based Learning?

In a systematically designed and controlled experiment conducted in a naturalistic instructional setting, we examined adult students’ learning of two concepts. Two intact classes taught by the same instructor were assigned to 1 of 2 conditions. In 1 class, instruction was problem based for 1 concept. For a second concept, lecture/discussion was theexclusivemethod. In theotherclass,matchingofconceptandmethod(problem based or lecture/discussion) was reversed. Two forms of assessment of learning occurred 6 and 12 weeks following instruction. At the initial assessment, the lecture/discussion group showed superior learning for 1 concept and the groups performed equivalently for the other concept. At the later assessment, however, the 2 groups showed equivalentability toaccesseachof theconcepts,buteachgroupshowedsuperiorexplanation of the concept for which they had experienced problem-based learning. Results support the hypothesis of integration of new information with existing knowledge structures activated by the problem-based experience as the mechanism by which problem-based learning produces its benefits.