This cross-sectional study investigated a model of risk and protective factors of the family, school, and peer environment that predict adolescent delinquent behaviour. Three social groups were compared: newcomer ethnic German adolescent immigrants, experienced ethnic German adolescent immigrants, and native adolescents. Based on theoretical assumptions about processes of acculturation, it was hypothesized that the strength of associations between the variables in the theoretical model would vary between newcomer immigrants and native adolescents and also between newcomer and experienced immigrants, but would be similar for experienced immigrants and native adolescents; these hypotheses were supported. Findings suggest that certain risk factors, such as parental violence and involvement with delinquent peers, are more strongly related to delinquency among newcomer immigrants than among experienced immigrants and native adolescents, whereas certain protective factors, such as parental knowledge and school bonding, seem to be relevant for experienced immigrants and native adolescents only... [ABSTRACT FROM AUTHOR]