As part of "The Wallace Foundation's Principal Pipeline" initiative, six districts have been working to reshape their school leadership evaluation systems to provide better and more consistent feedback to principals--and ultimately to help them grow in their jobs. In this article, Pamela Mendels, a senior editor at Wallace, describes the…

Evaluators report effects of education initiatives as standardized effect sizes, a scale that has merits but obscures interpretation of the effects' practical importance. Consequently, educators and policymakers seek more readily interpretable translations of evaluation results. One popular metric is the number of years of learning necessary to…