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. Jeremy Burrus is Senior Director of the Center for Social, Emotional, and Academic Learning at ACT, Inc. Samuel H. Rikoon is a Research Scientist in the Center for Research on Validity, Equity, and Fairness in Learning and Assessment at Educational Testing Service. Meghan W. Brenneman is a social-emotional learning expert and currently works as a Research Manager at a technology company.