An analysis was conducted of the What Works Clearinghouse (WWC) research evidence base on the effectiveness of replicable education interventions. Most interventions were found to have little or no support from technically adequate research studies, and intervention effect sizes were of questionable magnitude to meet education policy goals. These…

Strength and integrity issues are central to planning and interpreting evaluation studies. In the absence of actual data from previous studies, estimates of strength and integrity can often be derived in other ways. These issues of strength and integrity are described in the context of resource allocation in evaluation research. (Author/BS)