Intervention Effectiveness Ratings for Middle School Math

Each middle school math curriculum that had at least one study meeting WWC standards (with or without reservations) received a rating of effectiveness in 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 between the average math achievement for students in the intervention and comparison conditions, and the consistency of findings across studies.

The research evidence 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 for the 7 middle school math curricula.