JSD: I’d like you to talk about two key aspects of your work. One is evaluating professional learning and the other is coaching. In Assessing Impact: Evaluating Staff Development, 2nd Edition, you write, “Evaluation — not just data — is increasingly important for changing schools. … The use of data, not just data alone, has the potential to transform teaching and learning and systems to support them.” How do educators and schools make the leap from gathering data to conducting evaluations? Joellen Killion: Data become information when they are analyzed and interpreted. To move from data to evaluation, we begin with a plan that sets a framework for the evaluation. The plan is created in the context of the professional learning we are evaluating. Data