The title of the post is a bit misleading, because Mark Guzdial isn't talking about 'taking a test' specifically, "the critical feature of learning is trying to understand, trying to generate an answer." According to the study, "students are better prepared to understand a theory after first exploring by themselves, and that tangible user interfaces are particularly well-suited for that purpose." Of course, Daniel Willingham, who is cited by Guzdial, looks at results like that and reads "test", which he then cites as 'the testing effect'. But the effect has nothing to do with the fact that it's a test, and everything to do with the fact that the student is trying to understand. But "understand" isn't part of the Willingham vocabulary. Guzdial should stick to more reliable sources.
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