The Selling-Wolfgang scale was used to assess the severity of the crime. Milwaukee County, the State's largest urban area, had the most serious delinquency problems. Males were arrested more frequently than females; older juveniles accounted for most of the arrests; minority youth were overrepresented in the sample; and the relationship between socioeconomic status and arrest frequency was not straightforward. Delinquent behavior was prevalent, violent arrests were not commonplace, and prediction of violence in a delinquent career would be difficult. Most of the juveniles arrested for violent crime in 1980 were apprehended on robbery or battery charges. The juveniles were not likely to possess or use a weapon. The majority of victims did not sustain physical injury from the violent crime. In general, the juvenile court's response to the 1980 violent offenses was proportional to the offense severity. The majority of the 1,818 arrests in the sample resulted in no formal court action. Court dispositions appeared to have limited impact on crime. Programs for serious offenders should address the problems identified by the data, which include school failure, drug and alcohol abuse, and recidivism. Tabular data and a 136-item bibliography are provided.