Explanations of gang membership were studied in a population of 11,000
secondary school students. Lower self-esteem, perceived academic abil
ity, psychosocial health, and bonds with institutions appeared to prec
ede gang membership (selection model). Greater drug use, greater delin
quency, greater fear of harm, and being armed were precursors and cons
equences of gang membership (facilitation and selection models). ''Wan
nabes'' were partway between nonmembers and members. Findings were con
sistent with gang membership as a result of lack of social integration
.