From the original database of 161 programs identified as potentially within the scope of this study, 77 positive youth development programs had evaluations that appeared to meet the initial criteria for the analysis. Eight-four programs were not included for one of the following reasons:
- No evaluation existed;
- The "evaluation" contained no data beyond a narrative case study;
- The study sample was an indicated population (symptomatic or in treatment); or,
- Despite comprehensive efforts, adequate evaluation information could not be retrieved.