In the current talk, a chapter from a 2014 upcoming European Hand-book of Criminal Careers and Life-course Criminology will be present-ed. The chapter is a summary of the key findings concerning criminality from a Swedish large scale prospective longitudinal research program: the IDA-program (Individual Development and Adaptation; previously named The Örebro Project). It is an ongoing longitudinal research program in which individuals have been followed from 1965, when they were at the age of 10, in a mid-sized Swedish municipality. Crime has been assessed from childhood to adulthood primarily by using official registers. The program has been listed as a key longitudinal criminological study and has thus far contributed with many original research studies on both the description and explanation of the development of criminal behavior. In this chapter, the focus is on the nature and prevalence of crime, stability of criminal behavior over developmental age-spans, early individual and social school age risk factors predicting registered criminality in general (through age 35), and criminal pathways more specifically, and the type of adulthood maladjustments associated with the different criminal path-ways, among both males and females. Results will be presented in relation to the theoretical assumptions of Moffitt’s life-course theory and Thorn-berry and Krohn’s Interactional theory. Several studies from the IDA-pro-gram are unique and have often been cited because of the holistic-inter-actionistic theoretical perspective on crime and the novel person-oriented methodological approaches to study crime, and not the least because both males and females are studied