The authors argue for a reconceptualization of rigor that requires sustained, direct, and systematic documentation of what takes place inside programs to document how students and teachers change and adapt interventions in interactions with each other in relation to their dynamic local contexts. Building on promising new programs at the Institute…

This article describes elements of an approach to research and development called "design-based implementation research." The approach represents an expansion of design research, which typically focuses on classrooms, to include development and testing of innovations that foster alignment and coordination of supports for improving…