Abstract
Official criminal records are one of the most well-known sources of crime data. Accordingly, this chapter reviews the process whereby the criminal record searches were conducted in order to construct the life-course conviction records among the Cambridge Study in Delinquent Development males from ages 10 to 56. This rich offending information is then analyzed with a particular focus on the key criminal career dimensions of onset age, offending continuity, and criminal career length. The incarceration histories of the Cambridge Study in Delinquent Development males are briefly reviewed also.