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A 2006 report described that many researchers perceived the WWC to be passive cataloger of available research. In contrast to that view, the paper described a series of opinionated subjective decisions which the WWC made about providing some educational research and declining to index another sort.
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Some of the concerns expressed about WWC are that it appears to have difficulty keeping up with the research so it may not be current; and when a program is not listed on their database, it may be that it did not meet their criteria or they have not yet reviewed it, but it's not clear which. In
66:’ Evidence-Based Policy team , on January 16, 2018 expressed concerns about the validity of the ratings provided by WWC. It says WWC in some cases reported a "preliminary outcome when high-quality RCTs found no significant effects on more important and final educational outcomes".
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Kim, Min Kyung; McKenna, John
William; Park, Yujeong (July 2017). "The Use of Computer-Assisted Instruction to Improve the Reading Comprehension of Students With Learning Disabilities: An Evaluation of the Evidence Base According to the What Works Clearinghouse Standards".
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Hitchcock, John H.; Horner, Robert H.; Kratochwill, Thomas R.; Levin, Joel R.; Odom, Samuel L.; Rindskopf, David M.; Shadish, William R. (May 2014). "The What Works
Clearinghouse Single-Case Design Pilot Standards: Who Will Guard the Guards?".
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Maggin, Daniel M.; Briesch, Amy M.; Chafouleas, Sandra M. (January 2013). "An
Application of the What Works Clearinghouse Standards for Evaluating Single-Subject Research: Synthesis of the Self-Management Literature Base".
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Song, Mengli; Herman, Rebecca (September 2010). "Critical Issues and Common
Pitfalls in Designing and Conducting Impact Studies in Education: Lessons Learned From the What Works Clearinghouse (Phase I)".
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Confrey, Jere (January 2006). "Comparing and
Contrasting the National Research Council Report On Evaluating Curricular Effectiveness With the What Works Clearinghouse Approach".
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The WWC recommendations for interpreting the results of single-case educational studies is the subject of discussion.
360:"WWC, Robert Slavin's blog, Director of the Center for Research and Reform in Education at Johns Hopkins University"
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Wolery, Mark (January 2013). "A Commentary: Single-Case Design
Technical Document of the What Works Clearinghouse".
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