The so-called value-added model is an “imperfect, but still informative” measure of teacher effectiveness, especially when it is combined with other measures, according to the preliminary results of a large-scale study funded by the Bill and Melinda Gates Foundation. The study’s early findings have ratcheted up the debate over whether student test scores should be used in evaluating teachers—and if so, how. [Read “Should student test scores be used to evaluate teachers?” [1]]
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