Is DCPS's new IMPACT Evaluation System Rigged?

On November 1, Valarie Strauss invited Columbia Teachers College professor, Aaron Pallas to analyze just how the new IMPACT teacher evaluation system works and his simple description (here) is a shocker. It turns out that teachers are not being evaluated against a standard of good teaching, but rather against the student test score achievement of similarly situated teachers in DCPS. So half the

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