Electoral system: Difference between revisions

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== Criteria in evaluating voting systems ==
== Criteria in evaluating voting systems ==


Various criteria are used in evaluating voting systems. However, it is impossible for one voting system to pass all criteria in common use. For example, [[Arrow's impossibility theorem]] demonstrates that the following criteria are mutually contradictory:
Various criteria are used in evaluating voting systems. However, it is impossible for one voting system to pass all criteria in common use. For example, [[Arrow's impossibility theorem]] demonstrates that the following criteria are mutually contradictory for an [[Ordinal voting]] system:


* The voting system should always give a result
* The voting system should always give a result
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*[[Proportional representation|Proportionality]]
*[[Proportional representation|Proportionality]]
*Simplicity - speed
*Simplicity - speed
*Resistance to strategy
*Resistance to [[Tactical voting]]
*Resistance to [[Vote splitting]]
*Reduction of potential for dispute after the fact
*Reduction of potential for dispute after the fact
*Reduction of potential for fraud
*Reduction of potential for fraud