Each year, educators engage in hours of professional learning to enhance their practice. Those hours are limited, both by contract and the imperative of keeping teachers in classrooms as much as possible. It is essential that this professional learning time is well-spent and pays dividends toward the goal of all public education: ensuring that each student succeeds. Evaluation is fundamental for assessing the quality, effectiveness, and impact of professional learning. It provides data for planning and strengthening educators' learning and, ultimately, explaining and justifying school systems' investments in it. This article presents the following 7 reasons to evaluate professional learning: (1) Problem Identification; (2) Planning; (3) Quality; (4) Implementation; (5) Effectiveness; (6) Impact; and (7) Social Justice and Human Rights.