Problem-Based Learning in K–12 Education

Enthusiasm for problem-based learning (PBL) is widespread, yet there exists little rigorous experimental evidence of its effectiveness, especially in K–12 populations. Reported here is a highly controlled experimental study of PBL in a middle school population. Between- and within-subject comparisons are made of students learning the same material under three instructional conditions: lecture/discussion, characteristic small-group PBL, and solitary PBL. Assessments of comprehension and application of concepts in a new context 9 weeks after instruction showed superior mastery in both PBL conditions, relative to the lecture condition, and equivalent performance in the two PBL conditions, the latter indicating that the social component of PBL is not a critical feature of its effectiveness.