The data set provides information on 298,847 cases and 50 variables. It covers offender characteristics and traces patterns of court action and case disposition. All offenders reaching final case disposition during 1980 are included, regardless of the date an offender entered the criminal justice system. Using the adult offender as the unit of analysis, selected information is provided about the offender, the arrest, the prosecution, and court disposition. The data set are available in two formats: card image and OSIRIS. A sample of the machine-readable information appearing for a typical variable and an explanation of each component of the information are provided.