High-quality preschool programs are heralded as an effective policy tool to promote the development and life-long wellbeing of children from low-income families. Yet evaluations of recent preschool programs produce puzzling findings, including negative impacts, and divergent, weaker results than were shown in demonstration programs implemented in…

Implementation intentions are self-regulatory strategies that increase the probability that desired goals will be achieved. While their effectiveness in the short term is well established in the literature, the long-term effects are not. The present study, which was conducted in France during the COVID-19 lockdown, aimed to test whether reminders…

In this randomized control study, we evaluated science teachers' pedagogical practices via classroom observations following ongoing, intensive, and structured instructional support sessions. These sessions included virtual professional development (VPD) and virtual mentoring and coaching (VMC) that accompanied a literacy-infused science…

We report the results of a preregistered, cluster randomized controlled trial of a mathematics learning intervention known as interleaved practice. Whereas most mathematics assignments consist of a block of problems devoted to the same skill or concept, an interleaved assignment is arranged so that no 2 consecutive problems require the same…

In a randomized controlled trial of a teacher data-use intervention, the Linking Study tested the impacts of a cyclical and collaborative process that linked teachers' data on instructional practice with data on their students' learning. This article describes the theory of the intervention and its roots in the literature as a backdrop for an…

We report the results of a pre-registered, cluster randomized controlled trial of a mathematics learning intervention known as interleaved practice. Whereas most mathematics assignments consist of a block of problems devoted to the same skill or concept, an interleaved assignment is arranged so that no two consecutive problems require the same…

Field trips to see theater performances are a long-standing educational practice; however, there is little systematic evidence demonstrating educational benefits. This article describes the results of five random assignment experiments spanning 2 years where school groups were assigned by lottery to attend a live theater performance or, for some…

This article reports the results of a randomized control trial of a semester-long intervention designed to promote ninth-grade science students' use of text-based investigation to create explanatory models of biological phenomena. The main research question was whether the student participants in the intervention outperformed the students in the…

Mixed-attainment teaching has strong support from research and yet English schools are far more likely to teach students in "ability" groups. Although research has considered some of the specific benefits of mixed-attainment grouping, there has been little attention to the reasons schools avoid it. This article explores data from the…

In a common approach for scaling up effective educational practice, schools adopt evidence-based programs to be implemented with fidelity. An alternative approach assumes that programs should be adapted to local contexts. In this randomized trial of a reading intervention, we study a scaffolded sequence of implementation in which schools first…

Research has shown that teacher effectiveness is the most important school-based factor that influences student outcomes, including student achievement. Studies have also shown that there is substantial variation in teacher effectiveness, such that some teachers improve student outcomes at a much faster rate than others. The strong influence of…

The purpose of this article was to summarize results from 5 randomized control trials assessing the effects of intervention to improve the fraction performance of 4th-grade students at-risk for difficulty in learning about fractions. We begin by explaining the importance of competence with fractions and why an instructional focus on fractions…

American Institutes for Research (AIR) is conducting an impact evaluation of The United Nations Children's Emergency Fund's (UNICEF's) teacher-training program and reinforcing text messages that aim to provide meaningful knowledge regarding the transformative potential of positive gender socialization in education for peace building in the region…

Restorative practices in schools lack rigorous evaluation studies. As an example of rigorous school-based research, this article describes the first randomized control trial of restorative practices to date, the Study of Restorative Practices. It is a 5-year, cluster-randomized controlled trial (RCT) of the Restorative Practices Intervention (RPI)…

A web-based activity and testing system (WATS) has features such as adaptive problem sets, videos, and data-driven tools for instructors to monitor and scaffold student learning. Central to WATS adoption and use are questions about the implementation process: What constitutes "good" implementation and how far from "good" is…