Teacher professional development (PD) is among the most prominent levers used to improve teaching quality. The findings of research studies examining PD interventions are heterogeneous, with meta-analyses indicating mean positive impacts but also the existence of many ineffective programs. "Educational Researcher" has served as a…

Why, when so many educational interventions demonstrate positive impact in tightly controlled efficacy trials, are null results common in follow-up effectiveness trials? Using case studies from literacy, this article suggests that replication failure can surface hidden moderators--contextual differences between an efficacy and an effectiveness…

The widely publicized opposition to the implementation of the Common Core State Standards (CCSS) is in marked contrast to its relatively uncontroversial development and adoption--a contrast that points to the importance of understanding how the politics of enactment differs from the politics of implementation. In this article, we draw on the…