This book presents findings from a series of interlocking case studies of nationally visible R&D projects, with a unique focus on how researchers and practitioners actually worked together, and the policy, social, and institutional processes that either enabled or hindered their work. By investigating the roles played by research and practice in these efforts, the book illuminates lessons for those who seek to do this kind of work in the future. It suggests implications for designers, funders, school and district leaders, and universities.