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Nintil - On Bloom's two sigma problem: A systematic review of the effectiveness of mastery learning, tutoring, and direct instruction

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One of the Collison questions is Is Bloom's "Two Sigma" phenomenon real? If so, what do we do about it? Educational psychologist Benjamin Bloom found that one-on-one tutoring using mastery learning led to a two sigma (!) improvement in student performance. The results were replicated. He asks in his paper that identified the "2 Sigma Problem": how do we achieve these results in conditions more practical (i.e., more scalable) than one-to-one tutoring? In a related vein, this large-scale meta-analysis shows large (>0.5 Cohen's d ) effects from direct instruction using mastery learning. "Yet, des

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