Over the last twenty years, education researchers have increasingly conducted randomised experiments with the goal of informing the decisions of educators and policymakers. Such experiments have generally employed broad, consequential, standardised outcome measures in the hope that this would allow decisionmakers to compare effectiveness of…

The purpose of this article is to present various single-case outcome assessment methods for evaluating school-based intervention effectiveness. We present several outcome methods, including goal attainment scaling, visual analysis, trend analysis, percentage of non-overlapping data, single-case mean difference effect size, reliable change index,…

This Study Snapshot highlights key findings from a study that examines up-to-date information about evidence-based practices that are essential for early childhood educators and policymakers as they support preschool children's language and literacy development. The study used a process modeled after the What Works Clearinghouse (WWC) methodology…

This paper contributes to the class size literature by analysing whether short-run class size effects are constant across grade levels in compulsory school. Results are based on administrative data on all pupils enrolled in Danish public schools. Identification is based on a government-imposed class size cap that creates exogenous variation in…

The Student Success Skills program is an evidence-based, counselor-led intervention founded on a variety of humanistic principles. Five studies and a recent meta-analysis provide evidence that integrating human potential practices into the school by teaching students foundational learning skills strengthens the link between school counseling…

This policy brief summarizes the positive results of a rigorous evaluation of Reading Partners, a widely used program that offers one-on-one tutoring provided by community volunteers to struggling readers in low-income elementary schools. A total of 1,265 students in 19 schools in three states were randomly assigned to receive Reading…

This paper presents an overview of 5 meta-analyses of early intensive behavioral intervention (EIBI) for young children with autism spectrum disorders (ASDs) published in 2009 and 2010. There were many differences between meta-analyses, leading to different estimates of effect and overall conclusions. The weighted mean effect sizes across…

There is broad conceptual consensus that the effectiveness and efficiency of early childhood intervention (ECI) for vulnerable children is correlated with the active involvement and full participation of parents. This requires a general understanding of each family's needs and desires and specific strategies for determining what each family needs…

Drawing on our five years of experience developing WWC evidence standards and reviewing studies against those standards as well as current literature on the design of impact studies, we highlight in this paper some of the most critical issues and common pitfalls in designing and conducting impact studies in education, and provide practical…

This report summarizes the complex research literature on quantitative methods for assessing how impacts of educational interventions on instructional practices and student learning differ across students, educators, and schools. It also provides technical guidance about the use and interpretation of these methods. The research topics addressed…

Schools are an important context for children's social and emotional development. In classrooms and other school settings, children and adolescents need to have skills such as managing negative emotions, being calm and focused, following directions, and navigating relationships with peers and adults. To build and support these skills, schools have…

The present article provides a primer on using effect sizes in research. A small heuristic data set is used in order to make the discussion concrete. Additionally, various admonitions for best practice in reporting and interpreting effect sizes are presented. Among these is the admonition to not use Cohen's benchmarks for "small," "medium," and…

A large body of literature documents the central importance of fidelity of program implementation in creating an internally valid research design and considering such fidelity in judgments of research quality. The What Works Clearinghouse (WWC) provides web-based summary ratings of educational innovations and is the only rating group that is…

The trends and findings from a descriptive analysis of 25 years of research studies examining the effectiveness of technology to support the compositional writing of students with learning and academic disabilities are presented. A corpus of 85 applied research studies of writing technology effectiveness was identified from among 249 items in the…

During the 2009-2010 school year, Marzano Research Laboratory (MRL) was commissioned by Promethean Ltd. to conduct a second year evaluation study of the effects of Promethean ActivClassroom on student academic achievement. This executive summary highlights the key findings. [For "A Second Year Evaluation Study of Promethean ActivClassroom. Final…