The Study of Social and Emotional Skills (SSES) is an international effort led by the Organization for Economic Co-operation and Development (OECD). The Houston Independent School District (HISD) served as the only U.S. site for this study. Over 6,400 10-year-old and 15-year-old students from 119 HISD schools participated in the SSES in the fall of 2019. This series of briefs looks at how social and emotional skills are related to academic outcomes, absenteeism, and exclusionary discipline; the context of SSES skills; and the commonalities and differences between students’ self-ratings and teachers’ ratings of students’ SE skills.