Australian Electoral System: Preferential VotingPreferential Voting, the voting system known in the United Kingdom as the Alternative Vote and in the USA as Instant Run-off Voting , is widely used for Australian lower house elections. With Fiji and Papua New Guinea (the latter from 2007), Australia is one of only three nations to use this system for national elections. Some Australian elections use full Preferential Voting, some use optional Preferential Voting.