For instance, Colliver contends that the popularity of PBL is predicated on a kind of mass enthusiasm rather than empirically based scientific evidence (p.259). Colliver asserts that PBL has not proven valid and lacks confirmation as successful teaching model. His article is largely a condemnation of the assertions that proponents of PBL assert. (He also implicates the cognitive sciences that underscore PBL.)

Colliver believes medical educators must abandon their support of PBL until there is sufficient empirical proof that PBL is, in fact, an effective way to teach people.

After ten years of administering Problem-Based Learning at the University of Missouri's

School of Medicine, Hoffman and her research team sought to examine the overall efficacy of PBL training. Hoffman believes the PBL curriculum emphasizes learning in tandem with practical problem solving. Hoffman believes that PBL helps students access their own knowledge and also grasp relevant information they will use in real practice.

In order to discern the effects, if any, of problem-based learning on its medical students

Hoffman and her team chose several research methods. First, she divided her medical students into two categories: Students learning via traditional teaching methods and students reliant on PBL. Both groups had equal numbers of respondents. The mean age was...

Hoffman's team relied on four indices to determine the potential outcomes: Students' academic aptitudes; grade point averages; students' performances on the USMLE (Step 1 and 2); residency program directors responses to each student. Altogether,
Hoffman and her team asserted that the changes her team observed in traditionally trained students differed from PBL students. They came to believe PBL trained graduates acquired skills needed for professional practice. This outcome, she felt, was especially important given the complexities inherent in today's health care system.

Nurses

In 2010, Szogedi and his research sought evidence to determine if PBL is more effective than traditional learning in the when training nurses. Szogedi's results suggest that PBL is more effective than traditional teaching for nurses who were taught cardiopulmonary resuscitation. (Parenthetically, the research was conducted in Hungary.)

Szogedi conducted research on the effects of PBL on 1,775 nurses who had received cardiopulmonary resuscitation training. A comparative analysis was used at three major universities. The research consisted of a comparison of the outcomes of PBL students vs. students who were traditionally trained.

The researchers relied on t-tests and exam grades. The t-tests yielded significant differences (t=3.569; p