Found Effects

The WWC found Project GRAD to have no discernible effects on progressing in school and completing school

Improvement index

The WWC computes an improvement index for each individual finding. In addition, within each outcome domain, the WWC computes an average improvement index for each study and an average improvement index across studies (see Technical Details of WWC-Conducted Computations). The improvement index represents the difference between the percentile rank of the average student in the intervention condition versus the percentile rank of the average student in the comparison condition. Unlike the rating of effectiveness, the improvement index is based entirely on the size of the effect, regardless of the statistical significance of the effect, the study design, or the analyses. The improvement index can take on values between -50 and +50, with positive numbers denoting results favorable to the intervention group.

The average improvement index for progressing in school is –4 percentile points, with a range of –2 to –7 percentile points. The improvement index for the single outcome in the completing school domain is –3 percentile points.

Summary

The WWC reviewed five studies of Project GRAD. One study met WWC standards with reservations; the remaining studies did not meet WWC evidence screens. Based on this one study, the WWC found no discernible effects on progressing in school and completing school. The evidence presented in this report may change as new research emerges.