An extensive number of studies evaluating educational interventions are conducted and disseminated through peer-reviewed articles and conference presentations annually, but there is limited uptake of research among key stakeholders--educators and administrators (henceforth, practitioners; Farley-Ripple et al, 2018; Hollands et al., 2019; Slavin,…

Introduction: The What Works Clearinghouse (WWC) reviews rigorous research on educational interventions with a goal of identifying "what works" and making that information accessible to educators and policymakers. In rating the quality of causal research, the WWC has historically prioritized internal validity over external validity. One…

I. Purpose of the Study: Detecting whether interventions work or not (through main effect analysis) can provide empirical evidence regarding the causal linkage between malleable factors (e.g., interventions) and learner outcomes. In complement, moderation analyses help delineate for whom and under what conditions intervention effects are most…

Background/Context: When a researcher tests an educational program, product, or policy in a randomized controlled trial (RCT) and detects a significant effect on an outcome, the intervention is usually classified as something that "works." When the expected effects are not found, however, there is seldom an orderly and transparent…

Literacy skills are instrumental to unlocking a child's full potential and have a well-established link to long-term life outcomes. Children who can't read at grade level by 3rd grade are four times more likely to drop out of school, have fewer career prospects, and earn lower incomes as adults. However, despite some progress on literacy rates,…

Background/Context: Chronic absenteeism is a serious problem that has been linked to lower academic achievement, diminished socioemotional skills, and an increased likelihood of high school dropout (Allensworth et al., 2021; Gottfried, 2014). As a result, many schools have begun to embrace early warning systems (EWS) as a tool to identify and flag…

Many public and private initiatives have focused on improving prekindergarten (PK) through Grade 12 mathematics education, given that the mathematics content learned before college is foundational for later learning and college success across STEM subjects. Although decades of educational research have studied PK-12 mathematics interventions, the…

Background: Over the years, the quantity and quality of educational research has been rapidly improving. This can be attributed to the growing call to use evidence of effectiveness in decision-making by policymakers and practitioners. In fact, evidence sufficient to establish programs as "small", "moderate", or…

Results from large-scale evaluation studies form the foundation of evidence-based policy. The randomized experiment is often considered the gold standard among study designs because the causal impact of a treatment or intervention can be assessed without threats of confounding from external variables. Policy-makers have become increasingly…

Around the world during the last decade, policymakers increasingly emphasize the use of data in education to enhance student achievement. As a result, the number of reform initiatives to promote "data-based decision making" (DBDM) or "data-driven decision making" (DDDM) has increased rapidly. At the University of Twente in the…

Meeting the What Works Clearinghouse (WWC) attrition standard (or one of the attrition standards based on the WWC standard) is now an important consideration for researchers conducting studies that could potentially be reviewed by the WWC (or other evidence reviews). Understanding the basis of this standard is valuable for anyone seeking to meet…

Prior reviews of evidence for the impact of formative assessment on student achievement suggest widely different estimates of formative assessment's effectiveness, ranging from 0.40 and 0.70 standard deviations in one review. The purpose of this study is to describe variability in the effectiveness of formative assessment for promoting student…

Recognizing that standardized instructional treatments may not be equally effective across contexts, a growing number of scholars are arguing that the strategy of adopting packaged programs and striving to implement them faithfully is neither realistic nor desirable. An alternative view is that scaling up educational treatments requires balancing…

Increasing diagnoses of autism have led to pressure to improve the quality of educational services for children with autism by incorporating evidence-based practices (EBPs) into school programs. However, this process has been difficult, and both autism researchers and educators report frustration concerning the gap between research and practice.…

Project READI defines reading for understanding as the capacity to engage in evidence-based argumentation from multiple text sources of information, situated within a discipline. This definition reflects what is thought of as central competencies needed for success in 21st century society. Yet the evidence indicates that students are graduating…