The Workforce Investment Act (WIA) measures participant labor market outcomes to drive program performance. This article uses statistical analysis to examine the relationship between participant characteristics and key outcome measures in one large California local WIA program. This study also measures the impact of different training interventions on program outcomes while controlling for participant characteristics. The findings suggest that adjusting future performance measures for participant characteristics would create more valid performance measures. Further, we find that WIA training interventions do not yield consistent positive labor market outcomes after controlling for participant demographics. Finally, we recommend directions for future research. (Contains 5 tables.)