This book is an authoritative examination of summer learning loss, featuring original contributions by scholars and practitioners at the forefront of the movement to understand-and stem-the "summer slide." The contributors provide an up-to-date account of what research has to say about summer learning loss, the conditions in low-income children's homes and communities that impede learning over the summer months, and best practices in summer programming with lessons on how to strengthen program evaluations. The authors also show how information on program costs can be combined with student outcome data to inform future planning and establish program cost-effectiveness. This book will help policymakers, school administrators, and teachers in their efforts to close academic achievement gaps and improve outcomes for all students.