Intervention ratings for Elementary School Math

Each elementary school math program that had at least one study meeting WWC standards (with or without reservations) received a rating of effectiveness for math achievement. The rating aims to characterize the existing evidence, taking into account the quality of the research design, the statistical significance of the findings, the size of the difference in mean outcomes between students in the intervention and comparison conditions, and the consistency in findings across studies.

The research can be rated as positive, potentially positive, mixed, no discernible effects, potentially negative, or negative (see the WWC Intervention Rating Scheme). Table 1 shows the effectiveness ratings and extent of evidence for the five elementary school math curricula.