In this report, Joel Rose describes his experience leading a nonprofit organization called New Classrooms Innovation Partners that works to develop a more modern and impactful classroom experience. New Classrooms developed an innovative learning model called "Teach to One: Math" that integrates live, collaborative, and independent learning in ways that enable personalized instruction for each student, each day. In developing this model, Rose learned how crucial it is to integrate academic expertise, operational prowess, and technological know-how into the model's design. He also also learned that no matter how strong the design, it is equally essential to work with enthusiastic school partners that serve as early adopters. Based on lessons learned from the Teach to One model, Rose addresses a fundamental paradox in K-12 innovation: Meaningful improvements to student outcomes require learning models that challenge the basic constructs of how classrooms operate--and yet, the more new education models do so, the harder they become for schools to adopt. Rose goes on to examine four reasons America's K-12 schools tend to resist efforts to redesign the classroom. He concludes that creating space for innovation in accountability policy, catalyzing investment to develop promising models, expanding ways to support early adopters of new learning models, and removing barriers to procurement are key to giving new models a chance to deliver for America's kids.