This study was conducted in two high schools located in suburban, Long Island, New York, with a predominantly white population. The respondents in this study consisted of 234, 11th grade students. The data was analyzed using the structural equation model. Findings show that there is a positive correlation between percent of participation in organizations and academic self-concept. There is a positive correlation between self-concept and academic self-concept, as well as a correlation between self-concept and percent of participation in sports. An inverse correlation was found between the percent of participation in an organization and self-concept.