To ascertain the effects of participation in the Chattanooga Neighborhood Youth Corps, this study tested the null hypothesis that self concept was unaffected by participation, status in the program (in or out of school), and sex role. In an experimental pretest-posttest control group design, a series of three instruments were administered to 94 subjects, with a minimum of 3 months between tests. Failure to find many significant differences led to acceptance of the null hypothesis. Replication of the present research with groups equated as to sex and size and allowing more time between pre- and posttest would provide more valid information. (Author/BH)