This report offers practical guidance for out-of-school-time (OST) programs and intermediaries that wish to incorporate social and emotional learning (SEL) activities into their programming for youth. The lessons are derived from RAND’s study over four years of more than 100 afterschool programs across six communities participating in the Wallace Foundation’s Partnerships for Social and Emotional Learning Initiative (PSELI). The cities are Boston, Dallas, Denver, Palm Beach County, Tacoma, and Tulsa.