The goal of this study was to investigate the relationship between an adolescent's socioeconomic status (SES) and selected variables of the sub-subsystems of the River City High School senior class social system during the 1974-75 academic year. Variables for study were selected from each of the three sub-subsystems of the senior class social system: grade point average of the subjects was selected from the formal sub-subsystem; amount of cocurricular activities participated in by the subjects was selected from the semiformal subsubsystem; such family and community characteristics as sex, SES, and residence (town or farm) of the best friend of the subjects were selected from the informal sub-subsystem. Although more variables showed significant correlations with SES for girls than for boys, the boys showed higher correlations on those variables that did reach significance. It was concluded that the social behavior of adolescents in the subsubsystems of the River City High School senior class social system appears to be related functionally to the positions their families occupy in the social structure of the community. (Author/ND)