Solutions to problems such as dropping out of school, unemployment, and teen pregnancy must incorporate a full range of strategies that improve youths' life options. Giving youths opportunities to engage in service activities plays a part in such strategies by building self-esteem and giving youth a useful role in their communities. The programs described are based on four models. One model is that of school-based service programs in which students tutor and perform other tasks in the community, sometimes receiving academic credit for these activities. A second model consists of campus-based service programs that enlist college students in a wide range of community projects and activities. A third model involves conservation and urban corps programs that enable youth to work in crews in parks or community-improvement projects while acquiring skills, receiving modest compensation, and taking pride in their contributions to the community. A fourth model consists of part-time community-based or city-based service programs, including some focused on the summer months.