The sample included 270 males and 103 females. Just over 75 percent of the participants were Hispanic; most of the rest were white. Results revealed that 56 students were currently active in a gang; another 45 had been members of gangs but were no longer involved; and 68 students had considered joining a gang but did not or could not. These 169 students represented 45 percent of the total sample. A more restrictive definition of actual gang membership, based on initiation rites and external symbols of membership, resulted in a smaller proportion of student being categorized as current or former gang members. Finally, findings suggested that self-definition demonstrates clearer ties to self-reported gang-related activities than does the more restrictive one and that policies based on the restrictive definition may be less useful than those based on the broader definition. Tables and 15 references (Author abstract modified)