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What Works for Whom: Evidence Gap Maps of Study Data in the What Works Clearinghouse
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Betsy Wolf – Society for Research on Educational Effectiveness, 2023
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…
Descriptors: Evidence, Program Effectiveness, Educational Research, Validity
How to Decide Whether a Systematic Review Is Stable and Not in Need of Updating: Analysis of Cochrane Reviews
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Babic, Andrija; Poklepovic Pericic, Tina; Pieper, Dawid; Puljak, Livia – Research Synthesis Methods, 2020
Background: It is challenging to keep systematic reviews (SR) current and updated. Cochrane designated some of its SRs as "stable," that is, not in need of updating. The issue of stabilizing an SR is an important in research synthesis, because it could help reduce research waste. The aim of this study was to analyze publicly available…
Descriptors: Literature Reviews, Research Problems, Synthesis, Evidence
Methods for Evidence Synthesis in the Case of Very Few Studies
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Bender, Ralf; Friede, Tim; Koch, Armin; Kuss, Oliver; Schlattmann, Peter; Schwarzer, Guido; Skipka, Guido – Research Synthesis Methods, 2018
In systematic reviews, meta-analyses are routinely applied to summarize the results of the relevant studies for a specific research question. If one can assume that in all studies the same true effect is estimated, the application of a meta-analysis with common effect (commonly referred to as fixed-effect meta-analysis) is adequate. If…
Descriptors: Evidence, Synthesis, Meta Analysis, Research Problems
Applying Mixed Methods Research at the Synthesis Level: An Overview
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Heyvaert, Mieke; Maes, Bea; Onghena, Patrick – Research in the Schools, 2011
Historically, qualitative and quantitative approaches have been applied relatively separately in synthesizing qualitative and quantitative evidence, respectively, in several research domains. However, mixed methods approaches are becoming increasingly popular nowadays, and practices of combining qualitative and quantitative research components at…
Descriptors: Evidence, Literature Reviews, Educational Research, Research Methodology
Two Decades of Generalizable Evidence on U.S. Instruction from National Surveys
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Camburn, Eric M.; Han, Seong Won – Teachers College Record, 2011
Background: Students' instructional experiences--that is, their experiences working with subject matter during classroom instruction--are a major determinant of how they learn. Given the importance of classroom instruction, valid, generalizable evidence is needed by policymakers, researchers, and practitioners. Over the past two decades, a wealth…
Descriptors: Evidence, Income, Intellectual Disciplines, Standardized Tests
Advancements in Research Synthesis Methods: From a Methodologically Inclusive Perspective
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Suri, Harsh; Clarke, David – Review of Educational Research, 2009
The dominant literature on research synthesis methods has positivist and neo-positivist origins. In recent years, the landscape of research synthesis methods has changed rapidly to become inclusive. This article highlights methodologically inclusive advancements in research synthesis methods. Attention is drawn to insights from interpretive,…
Descriptors: Research Methodology, Synthesis, Critical Theory, Evaluation Criteria