Abstract
This chapter summarises some of the findings from the delinquency research in the Dunedin Study with an emphasis on the description of Moffitt's theory of adolescent-limited delinquency versus life-course- persistent delinquency. The characteristics of these two groups of delinquents (males only) are described in terms of some of the correlates and early childhood characteristics as well as later characteristics. The chapter concludes with some recommendations about how to prevent delinquency and how to deal with it when it occurs.