In this study, 224 ninth graders from two similar Kentucky towns were obtained by means of the Minnesota Multiphasic Personality Inventory. They were divided into various groups and analyzed in relation to a number of background factors and their resulting personality patterns. The emergence of various group patterns in this study demonstrates that the complexity of human personality necessitates complex analytic procedures.

The authors surveyed over 9,000 seventh grade students in the Houston Independent School District up to three times during their junior high school years and once as young adults between 1971 and 1980. Drawing on the extensive data gathered from this longitudinal survey, Kaplan and Johnson develop and test a comprehensive theoretical statement about the social and social psychological processes involved in the onset and course of deviant behavior.

Beyond Adolescence traces the lives of adolescents and youth from the late 1960s into the late seventies and early eighties. It is unusual because of the period of time in which the study took place, as well as because of the portion of the lifespan it covers - early adulthood. Concerned with understanding the role of problem behaviour in young adulthood and the factors that influence it, the study also traces outcomes on young adulthood of earlier involvements in problem behaviour, with an emphasis on personality and social environment. The research extends and tests the theoretical framework that guided the study - Problem Behaviour Theory - and shows its usefulness for understanding young adult problem behaviour and development.