Parliamentary government - The Australian Constitution establishes the Federal Government by establishing the Parliament, the Executive Government, and the Judicature (more commonly known as the Judiciary)—sometimes referred to as the "three arms of government." However, some of the most important aspects of Australia's government (described as parliamentary or responsible government) are not enshrined in the Constitution and are instead based on custom and convention. Parliamentary government means that the Executive Government is appointed by the Parliament, whereas responsible government means that the Executive Government is accountable to the Parliament. This is the central feature of a Westminster-style government modelled after the United Kingdom, as opposed to other systems of government in which the Executive is quite separate and not directly answerable to the Legislature, as in the United States.