It Takes an Ecosystem explores the idea and potential of the Allied Youth Fields—an aspirational term that suggests increased connection across the multiple systems in which adults engage with young people. Recent research and initiatives make a strong case for what developmentalists have argued for decades: A young person's learning and development is shaped in positive and negative ways by the interactions they have with all the adults in their life. Now is the time to reshape our systems to support this scientific understanding. The chapters in this book provide ideas, tools, examples, and visions for a more connected, more equitable world for young people and the adults in their lives.Endorsements for It Takes an Ecosystem"It Takes an Ecosystem offers a powerful and timely engagement of the possibilities and challenges facing the Out-of-School Time sector...this book charts a path forward for scholars, practitioners, community members to imagine OST anew—-in ways that are socially just and affirming, centered on the optimal development of youth and the power of community."— Bianca BaldridgeUniversity of Wisconsin Madison"The book's emphasis on an ecosystem approach, anchored in commitments to equity and racial justice, combines evidence-based analyses with a future-oriented call to action for the allied youth fields. This book will be a must-read for those committed to radically re-thinking how we bring sectors together to support thriving for children and youth."Ben KirshnerUniversity of Colorado