The constitution provides the framework of law by which the state is governed. It sets out the broad powers and rules under which the houses of parliament, Governor, executive government, judiciary, finances, government agencies and local government can operate. The NSW Constitution is an Act of Parliament introduced in 1902 after Federation, and followed on from several earlier Acts. It has been amended many times since. Most of it can be changed by an ordinary amendment Act in Parliament, although some sections, including those relating to major changes to the Legislative Council, can only be amended through a referendum of NSW voters.