Principals reject ‘value-added’ assessment that links test scores to educators’ jobs

The Obama administration supports it — despite warnings from assessment experts.

“Last April, the  Statistical Association, the largest organization in the United States representing statisticians and related professionals, said in a report that value-added scores “do not directly measure potential teacher contributions toward other student outcomes” and that they “typically measure correlation, not causation,” noting that “effects — positive or negative — attributed to a teacher may actually be caused by other factors that are not captured in the model.” After the report’s release, I asked the Education Department if Education Secretary Arne Duncan was reconsidering his support for value-added measures, and the answer was no.”


The NASSP issued a release saying that its governing body has given preliminary approval and that the organization will meet early next to finalize the decision.  That release quotes Mel Riddile, a former National Principal of the Year and chief architect of the NASSP statement, as saying:

“We are using value-added measurement in a way that the science does not yet support. We have to make it very clear to policymakers that using a flawed measurement both misrepresents student growth and does a disservice to the educators who live the work each day.”

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