Multi-winner voting methods
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Multi-winner voting methods generally fall into three categories:
- Block voting methods, where a majority of voters can generally elect all of the seats.
- Proportional representation (PR) methods, which give minorities representation relative to how large they are.
- Consensus multiwinner methods, which leave the least represented voter most represented. An example is Minimax approval.
Multi-winner methods can also be in a continuum between those i.e. a minority might be able to win some representation, but not a proportional amount. These types of multi-winner methods are often called semi-proportional.
Many multi-winner methods are based on or reduce to a known single-winner method in their single-winner case. For example, STV becomes IRV.
Notes[edit | edit source]
A common criterion for multi-winner methods is whether they allow a majority solid coalition to elect at least half of the seats. (Known as "Mehrheitsbedingung" in German). This is implied by the Droop proportionality criterion and a multi-winner form of the mutual majority criterion.
