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What Works Clearinghouse, 2015
The What Works Clearinghouse (WWC) Standards Briefs explain the rules the WWC uses to evaluate the quality of studies for practitioners, researchers, and policymakers. This brief explains what baseline equivalence is and why it matters. As part of the WWC review process for certain types of studies, reviewers assess whether the intervention group…
Descriptors: Control Groups, Participant Characteristics, Matched Groups, Research Methodology
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Topping, K. J.; Samuels, J.; Paul, T. – School Effectiveness and School Improvement, 2007
This study elaborates the "what works?" question by exploring the effects of variability in program implementation quality on achievement. Particularly, the effects on achievement of computerized assessment of reading were investigated, analyzing data on 51,000 students in Grades 1-12 who read over 3 million books. When minimum implementation…
Descriptors: Program Implementation, Achievement Gains, Reading Achievement, Independent Reading