Assessing Competencies for Social and Emotional Learning explores the conceptualization, development, and application of assessments of competencies and contextual factors related to social and emotional learning (SEL). As programs designed to teach students social and emotional competencies are being adopted at an ever‐increasing rate, new measurements are needed to understand their impact on student attitudes, behaviors, and academic performance. This book integrates standards of fairness, reliability, and validity, and lessons learned from personality and attitude assessment to facilitate the principled development and use of SEL assessments. Education professionals, assessment developers, and researchers will be better prepared to systematically develop and evaluate measures of social and emotional competencies.