This document highlights some of the evidence base that shows well-designed and well-delivered summer enrichment and comprehensive afterschool can address “learning loss,” accelerate learning, and expand opportunities for student success. The findings are part of an extensive research- and evidence-base that supports local and state leaders’ efforts to address learning loss and acceleration by investing ESSER III and other funds to expand access, as called out in the law, for “summer learning or summer enrichment” and/ or “comprehensive afterschool programs” and to improve existing opportunities in high-need neighborhoods and schools. (author abstract)