Independence of Judiciary in Australia a) How is the independence of the judiciary guaranteed in Australia? While the Westminster system had largely developed because of the doctrine of separation of powers, the Australian system of government is largely based on the Westminster. This doctrine of separation of powers proposes that the three institutions of government, the legislature, the executive and the judiciary should be exercised as separate and independent branches. It is this doctrine that stresses the need for the independence of the judiciary from the other two government institutions in order t