The study was intended to be exploratory and descriptive, a record of the perceptions and experiences of youth experts who are immersed in the youth gang/group problem. A qualitative approach based on personal narratives and responses to semistructured interviews was used to allow for more richness in the data. A total of 12 youths -- 11 males and 1 female -- ranging in age from 14 to 21, were interviewed. Interviews with adult key informants involved seven police officers, seven school officials, and three social workers. Interviews were also conducted with two parents of gang/group members and two adult victims. The researchers analyzed transcripts of participant interviews to develop a conceptual model of gang/group involvement and youth gang/group crime and violence. Chapters on study findings discuss youth perceptions of gangs/groups and youth violence, how youth become involved in youth gangs/groups, youth gang/group activities, participant suggestions for responding to youth gangs/groups, and a comparison of the views of youth and adult participants. According to study participants, youth gangs/groups and youth violence are a problem in southern Ontario and increasing in incidence and violence levels. Two primary types of gang/group configurations emerged from the interviews. One is the "group of friends," whose activities range from hanging out together to minor mischief. The second is the "hard core gang," which breaks down into three subsets: political/pseudo-political/paramilitary, mixed race organized and crime-focused/delinquent, and culturally homogeneous and organized crime-focused/delinquent. The findings support an exploratory model of youth gangs/groups that has eight categories for differentiating among subsets of the two main gang/group configurations. Each of these eight categories is described. Participant recommendations focus on the activities of police forces, schools, and government. 43 references and appended interview guides