Recent studies have suggested that quality of delivery matters to achieve better student outcomes in the context of school interventions. However, studies rarely measure quality of delivery and test its association with students' outcomes, perhaps due to lack of clarity regarding how to measure it. Here, we offer recommendations on how to select…

This study investigates, through an experimental design, the effectiveness of a professional development program on teacher knowledge and practices and on student learning. The program consisted of a series of video-based modules designed to respond to needs of U.S. teachers, as highlighted by findings from the 1999 Third International Mathematics…