Findings indicate that within the overall secondary school population, heavy involvement in youthful violence tends to be as prevalent as heavy involvement in other types of delinquent behaviors, such as truancy but less prevalent than heavy involvement in alcohol and drug use. In regards to the relationship between youthful violence and other problem behaviors, the hierarchical multiple regression analyses indicated that gang involvement, the use of alcohol and illicit drugs, and other delinquent behaviors remained strongly associated with violent behavior even after “common cause” variables such as genders and academic performance were held constant. Based on a sample of 7th through 12th graders, this study examined the relative contributions to violent behavior of substance use and other delinquent behaviors and provides findings for a wider range of age groups than what has typically been found in many school-based studies. Appendixes A and B and references