The study reported in this article addresses the question of how professional development can increase teacher noticing of student thinking over time. The data come from five teachers' participation in a two-year professional development intervention that combined lesson study, video clubs, and animation discussions. The analysis focuses on…

Video clips and animations have been used to encourage discussions of teaching in professional development. While both representations are useful for teacher noticing of students' thinking, animations may be more viable for sharing with a wider audience. We describe a process for representing a video clip of students' thinking as an animation…

Launching a problem is critical in a problem-based lesson. We investigated teachers' perspectives on the use of a problem that was analogous to the one provided during a launch. Our goal was to identify teachers' underlying assumptions regarding what should constitute a launch as elements of the "practical rationality of mathematics…

The availability of technological resources for designing animations opens new possibilities for teacher education. However, there are limited examples illustrating the process of designing and writing stories that can be shown with animations or staged video in relation to specific teacher education goals. We use the case of a professional…

We used a situative perspective to examine teachers' perceptions of a professional development intervention that integrated lesson study, video clubs, and animation discussions. The analysis of interviews with the five geometry teachers who participated in the intervention during two consecutive years showed three characteristics of professional…