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“Value-added Models (VAM) of accountability are now the rage. And it is understandable why this is so. They involve predictions about “appropriate” student gains of performance. If results – almost always measured via state standardized test scores – fall within or above the “expected” gains, then you are a “good” school or teacher. If the gains fall below the expected gains that you are a “bad” school or teacher."
Yet there are also many questions about the way VAM is being implemented. Grant Wiggins explains why Value Added Models are good in theory and also discusses many of the issues around the implementation of VAM (and includes many references).
