What's the best way to evaluate teachers? It is certainly a controversial subject in the world of education reform policy, and recently a group of education scholars came together to take a critical look at the subject. This 13-page report from the Brookings Institution's Brown Center Task Group on Teacher Quality looks into the nature of value-added evaluation. Published in November 2010, the report defines the term "value-added" as the "evaluation of teachers based on the contributions they make to the learning of their students." The report looks at the potential pitfalls and uses of using this metric in the educational setting, and it draws on related research done by other Brookings scholars and affiliates.