The Westminster system is a democratic parliamentary system of government modelled after the politics of the United Kingdom. This term comes from the Palace of Westminster, the seat of the Parliament of the United Kingdom.The system is a series of procedures for operating a legislature. It is used, or was once used, in the national legislatures and subnational legislatures of most Commonwealth and ex-Commonwealth nations upon being granted responsible government, beginning with the first of the Canadian provinces in 1848 and the six Australian colonies between 1855 and 1890.There are other parliamentary systems whose procedures differ considerably from the Westminster system.