Education decisionmakers need access to the best evidence about the effectiveness of education interventions, including practices, products, programs, and policies. It can be difficult, time consuming, and costly to access and draw conclusions from relevant studies about the effectiveness of interventions. The What Works Clearinghouse (WWC)…

The What Works Clearinghouse (WWC) systematic review process is the basis of many of its products, enabling the WWC to use consistent, objective, and transparent standards and procedures in its reviews, while also ensuring comprehensive coverage of the relevant literature. The WWC systematic review process consists of five steps: (1) Developing…

Ms. Jones stared at the stack of biology quizzes and wondered what went wrong. She thought about the lesson plans and wondered what she should have done differently. Ms. Jones is not alone in wondering how to improve student learning and classroom instruction. To improve student achievement, educators must determine what is working and what is…

To facilitate a more definitive understanding of the usefulness of formative assessment, this meta-analysis examined the impact of formative assessment on student academic achievement in the K-12 classroom. The study analyzed 258 effect sizes from 118 primary studies published around the world. By applying a broad lens for defining and…

Propensity and prognostic score methods are two statistical techniques used to correct for the selection bias in nonexperimental studies. Recently, the joint use of propensity and prognostic scores (i.e., two-score methods) has been proposed to improve the performance of adjustments using propensity or prognostic scores alone for bias reduction.…

We present an aggregation scheme that increases power in randomized controlled trials and quasi-experiments when the intervention possesses a robust and well-articulated theory of change. Intervention studies using longitudinal data often include multiple observations on individuals, some of which may be more likely to manifest a treatment effect…

Research on teaching effectiveness, especially those concerning teaching approaches and instructional strategies, rarely shows conclusively the effectiveness of an intervention. Then, these (quasi-) experimental studies on teaching effectiveness often involve distal measures of teaching components. In this article, the focus is on another likely…

Group design research studies can provide evidence to draw conclusions about "what works," "for whom," and "under what conditions" in special education. The quality indicators introduced by Gersten and colleagues (2005) have contributed to increased rigor in group design research, which has provided substantial…

Context: Assessments of baseline equivalency of intervention and control groups, "balance," play a critical role in evaluating educational interventions. The highest What Works Clearinghouse (WWC) of the Institute of Educational Studies (IES) standard for educational studies, "Meets WWC Design Standards Without Reservations,"…

This study examined how practicing instructional designers manage cognitive load in a standardized scenario as they select and implement instructional strategies, message design, content sequencing, delivery medium, and technology within various domains with learners at different levels of expertise. The study employed a quasi-experimental, mixed…

This Monte Carlo simulation study compares methods to estimate the effects of programs with multiple versions when assignment of individuals to program version is not random. These methods use generalized propensity scores, which are predicted probabilities of receiving a particular level of the treatment conditional on covariates, to remove…

This integrative literature review takes up the ongoing discussion about the place of mixed methods designs in educational research. We focus on studies that investigate the role of argumentation in inquiry-based learning, either as a means for enhancing inquiry (argument-based inquiry) or as a learning outcome (inquiry-based argument). We argue…

Many language teachers spend countless hours correcting student writing in hopes of improvement in accuracy, but as of yet, there has been little consensus regarding the efficacy of written corrective feedback (CF) or the type of CF that is most efficient. Although many studies have been conducted on the topic, conflicting results have arisen. In…

Background: Information regarding how the Special Olympics programs affect volunteers' self-esteem and attitudes towards individuals with intellectual disability (ID) is limited. We conducted a quasi-experimental study to address this gap. Method: The intervention group participants (n = 120) were Chinese volunteers for the Special Olympics Eunice…

African-American boys who receive exclusionary discipline (i.e. in- or out-of-school suspensions) are overrepresented at the elementary (kindergarten through fifth grade) level. Although African-American boys comprised only 15% of the population of this school, they accounted for 70% of the exclusionary discipline incidents. This…