Released in February 2017 by the Regional Educational Laboratory Program (REL), this IES four-part report series summarizes what is currently known about Social Emotional Learning (SEL) for students ages 3-8 and identifies effective SEL program characteristics. In the reports, you can find information about federal, state and district policies that support the implementation of SEL programs, teacher and classroom strategies that contribute to SEL, and how SEL outcomes can vary by student population.