At its most fundamental, mastery learning simply suggests that students should adequately comprehend a given concept before being expected to understand a more advanced one. While this seems straightforward and commonsensical enough, mastery learning has had a rocky and controversial history that is of interest for at least two reasons. First, it constitutes another instance of the education establishment failing to follow up on its own best research and soundest advice. Second, because of advances in technology, it is finally possible—nearly a century after the advantages of mastery learning
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