In relation to the referral of powers, say something like; The referral of powers is where state parliaments pass an Act which refers their legislative powers on a particular topic to the Commonwealth, they all have to agree; an example of this would be the Road's Case (1926). Then, outline briefly the facts of the case and its' impact on the law-making powers of the Commonwealth. So in essence, it confirmed the Commonwealth's power to provide tied financial grants to the states, it dramatically increased the authority of the parliament to determine on which projects the states spent money, for example, education, hospitals etc. A modern-day example would be Eastlink, the Commonwealth provided funding to the Victorian government with the condition that it be a toll-free freeway.