"Delinquency in a Birth Cohort is a turning point in criminological research in the United States," writes Norval Morris in his foreword. "What has been completely lacking until this book is an analysis of delinquency in a substantial cohort of youths, the cohort being defined other than by their contact with any part of the criminal justice system." This study of a birth cohort was not originally meant to be etiological or predictive...