Continuous professional development is a process that requires constant and active learning for a teacher throughout his/her professional life. In this process, teachers are expected to perform activities aiming at increasing both their professional development and the quality of teaching within the classroom. One of these is lesson study. This…

Success for All, a multi-tiered school reform program, has its origins in the US and has recently expanded to the Netherlands. Using a multiple case study approach, we investigated similarities and differences in the way struggling readers are supported at two Success for All schools in the US and two in the Netherlands. First- and second-grade…

Teachers' ability to elicit and build on students' mathematical thinking during instruction is critical in order to support students' mathematical growth. An emerging hypothesis in the field is that the construct of a "learning trajectory" (LT) has the potential to support teachers in making sense of and using student…

This article begins to unravel the question, "What curricular materials work best under what kinds of conditions?" The authors address this question from the point of view of teachers and their ability to implement mathematics curricula that place varying demands and provide varying levels of support for their learning. Specifically, the…