The number of youth under juvenile justice supervision decreased over the period 2001-02 to 2004-05 by 7 percent nationally. The rate for 10-17 year-olds under juvenile justice supervision declined from 5.1 per 1,000 to 4.8 per 1,000. Approximately 65 percent of youth were at least 15 years old when they had their first experience of juvenile justice supervision. Most youth completed one supervision period during a year, with community-based supervision being more common than detention-based supervision. Short supervision periods were more likely to include episodes of presentence remand. Supervision periods of medium or longer lengths were more likely to include episodes of sentenced detention or community-based supervision, respectively. Differences were found according to demographics such as age, sex, and Indigenous status in both the length and type of supervision. Appendixes A-C