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…

Teachers must meet a variety of students' mathematics learning needs but are often not trained to do so. Little is known about how teachers perceive their efficacy to meet diverse math learning needs. The purpose of this qualitative collective case study was to explore teacher attitudes and perceptions of professional development (PD) and…