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Direct Instruction: What the Research Says

Prepared by the Education Consumers Foundation
28.11.2011

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Over the last 25 years several researchers have reviewed and summarized the vast literature on Direct Instruction, many using meta-analysis. Meta-analysis is the statistical analysis of a group of previous studies pertaining to a given intervention. The effect size for a teaching methodology reflects the gain in learning produced by the methodology expressed in standard deviation units. Effect sizes are typically based on comparisons to previous outcomes with the same group or outcomes attained during the same time period by a comparison group. An effect of 0.25 or greater is generally said to represent an educationally significant gain or difference.