This report summarizes the Bridgespan's Group latest research project, "School District Innovation Zones: A New Wave of District-Led Efforts to Improve Economic Mobility." The report focuses on a new wave of district-led "innovation zones" that holds promise to overcome the challenges of turning around failing schools and deliver significant improvements in student outcomes. Innovation zones in Chicago; Denver; Indianapolis; Memphis, Tennessee; and Springfield, Massachusetts reveal certain design features that place a focus on improving teaching and learning over multiple years--the heart of any successful turnaround effort. Research identified three primary types of innovation zones: (1) district-led; (2) third-party led; and (3) autonomous improvement zones. Each type takes a different approach to reach the same goal--improving student outcomes for a subset of schools by providing guaranteed school-based autonomy in return for higher expectations and accountability for performance. This report also provides guidance for philanthropists considering district investments. [For "School District Innovation Zones: A New Wave of District-Led Efforts to Improve Economic Mobility," see ED582407.]