While I didn't do any additional looking into it -- this is often my biggest gripe. Is the _goal_ to have better exam scores and require less time studying or is the goal to be a better problem-solver holistically?
When faced with a novel problem that neither the problem-based learning group nor the traditional schooling group - which performed better and by what metrics?
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It seems silly to say "This group who was instructed to rote memorize material could indeed perform better on a direct memory recall examination." and then close the door on problem-based learning.
When I first went into the workplace, it took me a bit of time to adjust to the non-academic setting. You think differently, you work differently. I discovered and learned problem-solving skills that I was not taught in school. Frankly, though, I'm glad I was not taught those skills in school, because they are easy to learn in the workplace, especially if you have a solid theoretical grounding (something which is a lot harder to pick up on the job).
To the extent that generalized problem-solving is a real thing, I think it probably boils down to the ability to quickly internalize information and draw connections, which conventional schooling already focuses on anyway.