Lesson study, especially when conducted with support from targeted resources, is often identified as a potentially effective means to support teacher learning. In this study, 80 school-based teams of educators, representing 80 classrooms of third- or fourth-grade students in the US, were randomly assigned to one of four conditions: lesson study…

The article examines the results of two quasi-experimental studies of the implementation and impact of the Literacy Design Collaborative (LDC), an intervention designed to support secondary teachers' transition to Common Core State Standards in English language arts. The first study examines LDC implementation by eighth-grade social studies and…