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Multiwinner approval voting
Multiwinner approval voting, sometimes also called approval-based committee (ABC) voting, refers to a family of multi-winner electoral systems that use approval ballots. Each voter may select ("approve") any number of candidates, and multiple candidates are elected.
Multiwinner approval voting is an adaptation of approval voting to multiwinner elections. In a single-winner approval voting system, it is easy to determine the winner: it is the candidate approved by the largest number of voters. In multiwinner approval voting, there are many different ways to decide which candidates will be elected.
In approval block voting (also called unlimited voting), each voter either approves or disapproves of each candidate, and the k candidates with the most approval votes win (where k is the predetermined committee size). It does not provide proportional representation.
Proportional approval voting refers to voting methods which aim to guarantee proportional representation in case all supporters of a party approve all candidates of that party. Such methods include proportional approval voting, sequential proportional approval voting, Phragmen's voting rules and the method of equal shares. In the general case, proportional representation is replaced by a more general requirement called justified representation.
In these methods, the voters fill out a standard approval-type ballot, but the ballots are counted in a specific way that produces proportional representation. The exact procedure depends on which method is being used.
Party-approval voting (also called approval-based apportionment) is a method in which each voter can approve one or more parties, rather than approving individual candidates. It is a combination of multiwinner approval voting with party-list voting.
Other ways of extending approval voting to multiple winner elections are satisfaction approval voting, excess method, and minimax approval. These methods use approval ballots but count them in different ways.
Many multiwinner voting rules can be manipulated: voters can increase their satisfaction by reporting false preferences.
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Multiwinner approval voting AI simulator
(@Multiwinner approval voting_simulator)
Multiwinner approval voting
Multiwinner approval voting, sometimes also called approval-based committee (ABC) voting, refers to a family of multi-winner electoral systems that use approval ballots. Each voter may select ("approve") any number of candidates, and multiple candidates are elected.
Multiwinner approval voting is an adaptation of approval voting to multiwinner elections. In a single-winner approval voting system, it is easy to determine the winner: it is the candidate approved by the largest number of voters. In multiwinner approval voting, there are many different ways to decide which candidates will be elected.
In approval block voting (also called unlimited voting), each voter either approves or disapproves of each candidate, and the k candidates with the most approval votes win (where k is the predetermined committee size). It does not provide proportional representation.
Proportional approval voting refers to voting methods which aim to guarantee proportional representation in case all supporters of a party approve all candidates of that party. Such methods include proportional approval voting, sequential proportional approval voting, Phragmen's voting rules and the method of equal shares. In the general case, proportional representation is replaced by a more general requirement called justified representation.
In these methods, the voters fill out a standard approval-type ballot, but the ballots are counted in a specific way that produces proportional representation. The exact procedure depends on which method is being used.
Party-approval voting (also called approval-based apportionment) is a method in which each voter can approve one or more parties, rather than approving individual candidates. It is a combination of multiwinner approval voting with party-list voting.
Other ways of extending approval voting to multiple winner elections are satisfaction approval voting, excess method, and minimax approval. These methods use approval ballots but count them in different ways.
Many multiwinner voting rules can be manipulated: voters can increase their satisfaction by reporting false preferences.