Book excerpt: Expanding Minds and Opportunities: Leveraging the Power of Afterschool and Summer Learning for Student Success presents an impressive and significant body of work that comprises almost 70 reports, research studies, essays, articles, and commentaries by more than 100 authors representing a range of researchers, educators, policy makers, and professionals in the field, as well as thought leaders and opinion influencers. Collectively, these writings boldly state that there is now a solid base of research and best practices clearly showing that quality afterschool and summer learning programs-including 21st Century Community Learning Centers-make a positive difference for students, families, schools, and communities.