PR uses multi-seat districts where representatives are elected in proportion to the votes they receive. In the implementation of PR systems, a threshold of votes is usually required to ensure that representatives have at least a minimum base of support. Party based, they elect parties in proportion to their share of the popular vote. These are the most widely used systems around the world, and are appropriate for federal and state legislative bodies. These do well in combining geographic and issue-based representation, and are also appropriate for federal and state legislative bodies.
Votes are transferred as candidates are eliminated, thus all votes help select the winner.
Applicable to all levels of government. Choice voting was successfully used to elect city councils in two dozen U.S. cities, until the 1950s. This success led to its downfall. Antiquated ballot machines also forced cities to count ballots by hand, which is unnecessary today because the count can be accomplished by computer. IRV allows voters to rank their choices first, second, third, etc., and operates like a series of runoff elections.