[caption id="attachment_54431" align="alignleft" width="200" caption="Teachers who lead students to achievement gains in one year or in one class tend to do so in other years and other classes, the report said."][/caption]

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...

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