Resolvability criterion can refer to any

voting system criterion Electoral systems are the rules for conducting elections, a main component of which is the algorithm for determining the winner (or several winners) from the ballots cast. This article discusses methods and results of comparing different elector ...

that ensures a low possibility of tie votes. * In

Nicolaus Tideman Thorwald Nicolaus Tideman (, not ; born August 11, 1943 in Chicago, Illinois) is a Georgist economist and professor at Virginia Tech. He received his Bachelor of Arts in economics and mathematics from Reed College in 1965 and his PhD in economics ...

's version of the criterion, for every (possibly tied) winner in a result, there must exist a way for one added vote to make that winner unique. *

Douglas R. Woodall Douglas Robert Woodall (born November 1943 in Stoke-on-Trent) is a British mathematician and psephologist. He studied mathematics at the University of Cambridge, and earned his Ph.D. at the University of Nottingham in 1969, his thesis being "S ...

's version requires that the proportion of profiles giving a tie approaches zero as the number of voters increases toward infinity. Methods that satisfy both versions include approval voting,

range voting Score voting or range voting is an electoral system for single-seat elections, in which voters give each candidate a score, the scores are added (or averaged), and the candidate with the highest total is elected. It has been described by various ...

Borda count The Borda count is a family of positional voting rules which gives each candidate, for each ballot, a number of points corresponding to the number of candidates ranked lower. In the original variant, the lowest-ranked candidate gets 0 points, th ...

instant-runoff voting Instant-runoff voting (IRV) is a type of ranked preferential voting method. It uses a majority voting rule in single-winner elections where there are more than two candidates. It is commonly referred to as ranked-choice voting (RCV) in the U ...

minimax Condorcet In voting systems, the Minimax Condorcet method (often referred to as "the Minimax method") is one of several Condorcet methods used for tabulating votes and determining a winner when using ranked voting in a single-winner election. It is sometime ...

plurality Plurality may refer to: Voting * Plurality (voting), or relative majority, when a given candidate receives more votes than any other but still fewer than half of the total ** Plurality voting, system in which each voter votes for one candidate and ...

, Tideman's

ranked pairs Ranked pairs (sometimes abbreviated "RP") or the Tideman method is an electoral system developed in 1987 by Nicolaus Tideman that selects a single winner using votes that express preferences. The ranked-pairs procedure can also be used to create ...

, and Schulze. Methods that violate both versions include

Copeland's method Copeland's method is a ranked voting method based on a scoring system of pairwise "wins", "losses", and "ties". The method has a long history: * Ramon Llull described the system in 1299, so it is sometimes referred to as "Llull's method" * The ...

and the

Slater rule A slater, or slate mason, is a tradesperson who covers buildings with slate Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low ...

References

{{voting systems Electoral system criteria