"Project QUEST" ("Quality Employment through Skills Training") provides comprehensive support services to help participants complete occupational training programs at local community colleges and professional training institutes, pass certification exams, and obtain well-paying jobs in targeted sectors of the local economy. "Project QUEST" started in 1992 in San Antonio, Texas, and has been adapted in other locations in Texas and Arizona under different names, including "VIDA" ("Valley Initiative for Development and Advancement") in the Rio Grande Valley of Texas, "Capital IDEA" in Austin, Texas and Houston, Texas, "Project ARRIBA" ("Advanced Retraining & Redevelopment Initiative in Border Areas") in El Paso, Texas, and "JobPath" in Tucson, Arizona. This What Works Clearinghouse™ (WWC) report, part of the WWC's Postsecondary Career and Technical Education topic area, explores the effects of "Project QUEST" on education and labor market outcomes. The WWC identified five studies of "Project QUEST." Three of these studies meet WWC standards. The evidence presented in this report is from studies of the impact of "Project QUEST" on students enrolled in occupational training programs--including Asian, Black, White, and Hispanic students--in community colleges and professional training institutes in urban, suburban, and rural settings. [For the Intervention Brief, see ED615789. For the Intervention Snapshot, see ED615790.]