This systematic review and meta-analysis appraised and synthesized mathematics interventions research addressing rational number concepts for students with mathematics difficulties (MD) in Grades 3-9. Included studies (n = 28) meet the What Works Clearinghouse Group Design standards (Version 4.0) for study quality. Across all studies, we found…

This meta-analysis systematically reviewed the most up-to-date literature to determine the effectiveness of reading interventions on measures of word and pseudoword reading, reading comprehension, and passage fluency, and to determine the role intervention and study variables play in moderating the impacts for students at risk for reading…

The report of the national response to intervention (RTI) evaluation study, conducted during 2011-2012, was released in November 2015. Anyone who has read the lengthy report can attest to its complexity and the design used in the study. Both these factors can influence the interpretation of the results from this evaluation. In this commentary, we…

This article is intended to supplement a published research report (Gersten, Baker, Smith-Johnson, Dimino, & Peterson, in press) on an instructional intervention study by discussing some of the behind-the-scenes issues that typically do not appear in a published research report. In particular, I discuss how use of design experiments helped shape…

This article discusses critical issues related to conducting high-quality intervention research using experimental and quasi-experimental group designs. The importance of defining the nature of the independent variable, the value of measuring implementation, and the improvement of the quality of quasi-experiments are among the controversial topics…

This paper, a result of a series of meetings of researchers, discusses critical issues related to the conduct of high-quality intervention research in special education using experimental and quasi-experimental designs that compare outcomes for different groups of students. It stresses the need to balance design components that satisfy laboratory…

The site variability issue for Direct Instruction Follow Through sites is examined from a variety of perspectives--meta-analysis of the Abt Associates' data, norm-referenced comparisons, and a longitudinal look at stability of effects. Much of the seemingly unexplained variability found in both the Abt report and the reports by M. Kennedy and E.…

Conclusion about site-specific determinants of educational outcomes of the controversial longitudinal evaluation of the Follow Through programs (1976) are challenged again by reexamining the Direct Instruction model data. Reanalysis confirms earlier critiques and supports more recent research funding on the relationship between types of…

This report lays out the design for the Evaluation of Reading Comprehension Interventions, which is assessing supplemental reading comprehension programs for fifth-grade students in Title I schools. The key design parameters are described. The report itself provides the rationale for these decisions and discusses design and measurement issues,…

This article presents research-based examples of effective instructional approaches for improving the quality of stories and essays written by students with learning disabilities. A common goal of the studies examined was to teach students how to organize writing tasks, generate ideas about the writing topics, and produce final written products…

The observational study of effective instructional processes in kindergarten by DeVries and others is critiqued. It is maintained that (1) the study takes a narrow approach to constructivism that does not reflect current thinking; (2) there are flaws in the coding system used; and (3) the understanding of instructional issues involving minority…