Gov/en/Portal:Voting/Methods: Difference between revisions
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= Voting methods under study = | = Voting methods under study = | ||
''Status: first hypothesis (draft). WikiDeal has not adopted any voting method yet. This page documents the options being explored. Rules of procedure are on the [[Gov/en/Portal: | ''Status: first hypothesis (draft). WikiDeal has not adopted any voting method yet. This page documents the options being explored. Rules of procedure are on the [[Gov/en/Portal:Voting/Rules|Voting rules]] page; evidence and sources are on the [[Gov/en/Portal:Voting/Research|research page]].'' | ||
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=== The Condorcet paradox and the Schulze completion === | === The Condorcet paradox and the Schulze completion === | ||
Sometimes there is no Condorcet winner: A can beat B, B beat C, and C beat A, like rock-paper-scissors. This is the [https://en.wikipedia.org/wiki/Condorcet_paradox Condorcet paradox], and it happens in real elections (the Wikimedia Board election of 2008 contained such a cycle among mid-ranked candidates, see the [[Gov/en/Portal: | Sometimes there is no Condorcet winner: A can beat B, B beat C, and C beat A, like rock-paper-scissors. This is the [https://en.wikipedia.org/wiki/Condorcet_paradox Condorcet paradox], and it happens in real elections (the Wikimedia Board election of 2008 contained such a cycle among mid-ranked candidates, see the [[Gov/en/Portal:Voting/Research|research page]]). | ||
The [https://en.wikipedia.org/wiki/Schulze_method Schulze method] resolves these cycles by comparing chains of victories (beatpaths): a chain is only as strong as its weakest link, and the option with the strongest chains wins. The Schulze method always elects the Condorcet winner when one exists, satisfies [https://en.wikipedia.org/wiki/Monotonicity_criterion monotonicity] and [https://en.wikipedia.org/wiki/Independence_of_clones_criterion independence of clones] (adding a similar option does not change the outcome), and is used by free software communities such as [https://en.wikipedia.org/wiki/Debian Debian]. This combination of properties is why the initial hypothesis reserves it for complex multi-option decisions. | The [https://en.wikipedia.org/wiki/Schulze_method Schulze method] resolves these cycles by comparing chains of victories (beatpaths): a chain is only as strong as its weakest link, and the option with the strongest chains wins. The Schulze method always elects the Condorcet winner when one exists, satisfies [https://en.wikipedia.org/wiki/Monotonicity_criterion monotonicity] and [https://en.wikipedia.org/wiki/Independence_of_clones_criterion independence of clones] (adding a similar option does not change the outcome), and is used by free software communities such as [https://en.wikipedia.org/wiki/Debian Debian]. This combination of properties is why the initial hypothesis reserves it for complex multi-option decisions. | ||
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* The [https://en.wikipedia.org/wiki/Gibbard%E2%80%93Satterthwaite_theorem Gibbard-Satterthwaite theorem] shows that every reasonable voting method can, in some situations, be manipulated by strategic voting. | * The [https://en.wikipedia.org/wiki/Gibbard%E2%80%93Satterthwaite_theorem Gibbard-Satterthwaite theorem] shows that every reasonable voting method can, in some situations, be manipulated by strategic voting. | ||
The practical conclusion is not that voting is pointless, but that methods must be chosen for the properties that matter most in each context, and that the choice of method is itself a governance decision. This is the basis of the principle stated on the [[Gov/en/Portal: | The practical conclusion is not that voting is pointless, but that methods must be chosen for the properties that matter most in each context, and that the choice of method is itself a governance decision. This is the basis of the principle stated on the [[Gov/en/Portal:Voting/Main|portal main page]]: match the method to the complexity of the decision. | ||
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'''See also:''' [[Gov/en/Portal: | '''See also:''' [[Gov/en/Portal:Voting/Main|Voting at WikiDeal]] · [[Gov/en/Portal:Voting/Rules|Voting rules]] · [[Gov/en/Portal:Voting/Research|Voting research and experience]] · [[Gov/en/Portal:Meta/Licensing-and-Credits|Licensing and credits]] | ||
[[Category:Migration June 2026]] | [[Category:Migration June 2026]] | ||
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