The accurate prediction of violence has been in the spotlight of critical concern in recent years. To investigate the relative predictive power of peer pressure, youth perceived negative labeling, youth perceived access to educational and occupational roles, social alienation, self-esteem, sex, and age with regard to gang fight participation (GFP), 1,551 males and females, aged 10 to 19, representing a 6 percent systematic sample of youths from a Pennsylvania school system, completed the HEW Impact Scales and a demographic questionnaire. An analysis of the results showed that 74 percent of the sample could be correctly classified via the Impact Scales and by sex, with normative peer pressure towards delinquency being the most predictive variable for GFP level (low, medium, high). Youth perceived negative labeling by teachers was the second most predictive variable. Measures relating to alienation, youth perceived access to social roles, youth perceived negative labeling by parents and peers, parental rejection, self-esteem, age, and sex were unrelated to GFP level. The findings highlight the paramount role of peer relations in gang fight participation. (BL)