The Juvenile Justice national minimum data set is based on the experience of the young person within juvenile justice supervision, making it somewhat different to other criminal justice collections, which focus on legal orders. The data in this first report of the new data set covers this three-year period, with the main focus of findings being on the latest year. The Juvenile Justice national minimum data set is based on the experience of the young person within juvenile justice supervision, making it somewhat different to other criminal justice collections, which focus on legal orders. The data in this first report of the new data set covers this three-year period, with the main focus of findings being on the latest year.