Each day, around 6,000 young people are under juvenile justice supervision in Australia. This report is the fifth in the series on young people under juvenile justice supervision. It shows that the number of young people in detention on an average day increased by 17% over four years from 2004-05 and that over half of those in detention on average day in 2007-08 were Aboriginal or Torres Strait Islanders. The report contains information on the characteristics of young people under community-based supervision and in detention as well the type and length of their supervision.