Plurality-rule family

Not to be confused with first-preference plurality, the original voting rule the family is named after.

The plurality-rule family of voting methods is a system of ranked voting rules based on, and closely-related to, first-preference plurality. These rules include Instant-runoff (ranked choice) voting, as well as the two-round system and descending acquiescing coalitions. The rules share several major features like center squeeze and tend to produce similar results. It is often contrasted with the two other major families of voting rules, the evaluative rules and the majority (or Condorcet) rules.