This report discuses the supervision and enforcement of probationers and parolees in Australia. It outlines the movement of probationers and parolees among Australian states and territories. It discusses the disadvantages in a system of informal arrangements, predominantly the absence of legislative provision within the receiving state. It also outlines the legislation for formal arrangements in each state and territory. It provides information, and comparisons, on probationers and parolees within the United States and Europe. It outlines problems facing the introduction of formal interstate supervision and enforcement, this includes the distribution of probation officers throughout Australia. It outlines constitutional matters within the Commonwealth and limitations upon state power. It provides recommendations.