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description:
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"Underlying much of the debate about teacher quality is a fundamental rift over what to make of the existing body of research on the topic. There's actually little disagreement about what's in the research, but experts from different camps quickly part ways when it comes to how the data should be interpreted and how policymakers should respond... In large measure, that is because while the past 30 years have seen a multitude of studies on the characteristics of effective teachers, what's lacking are large-scale, controlled studies that get at one of the most crucial questions: How should teachers be trained?"
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