What started the movement to evaluate teacher performance by test scores?
For the last several decades, as far back as the 1970s, researchers have been estimating teachers’ impact on their students’ standardized test scores, and have found substantial variation among teachers. The students of some teachers consistently made more growth on tests than the students of other teachers did. They also generally found that teachers’ ability to raise test scores was only modestly correlated with concrete characteristics, such as experience and education.
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