Calls to advance students' ability to engage in mathematical reasoning practices including conjecturing, generalising and justifying (CGJ) place significant new demands on teachers. This case study examines how Mathematics Studio provided opportunities for a team of U.S. middle school teachers to learn about these practices and ways to promote…

This article presents findings from a study in which the author served as an expert coach and provided ongoing support to four elementary school teachers related to employing standards-based pedagogies in their mathematics classrooms. In addition to assisting teachers, the author examined which supports they sought and the impact of them on…

This study identified qualities of influential facilitators of elementary mathematics professional development. Extensive research relating to elementary mathematics professional development has emerged over the past three decades. Embedded in this body of research are recommendations for effective practices in professional development and…

Our purpose in this article is to propose a comprehensive, empirically grounded theory of action for improving the quality of mathematics teaching at scale. In doing so, we summarise current research findings that can inform efforts to improve the quality of mathematics instruction on a large scale, and identify questions that are yet to be…