In the past decade, research on learning trajectories has progressed from an agenda for research on student learning to include an agenda for research on teaching. In this paper, we use a design experiment to examine a professional development program created to support teacher learning of one learning trajectory. Using a re-interpretation of Ball…

As mathematics educators think about teaching that promotes students' opportunities to learn, attention must be given to the conceptualization of the professional development of teachers and those who teach teachers. In this article, we generalize and expand the instructional triangle to consider different interactions in a variety of teacher…

Explores elementary school teachers' beliefs, practices, and factors that influence the way teachers adapt mathematics reform rhetoric when trying to adopt it. Investigates beliefs beyond mathematics that influence teachers' decisions and choices for teaching mathematics. Discusses the issue of equity in mathematics teaching as one emerging…