single-winner voting system

Single-winner voting systems are voting systems in which a predetermined constituency elects a single person to some office; they contrast generally with proportional representation, in which constituencies are combined to elect several representatives at once.If there is to be only one officeholder - often the case for executive positions, such as president, mayor, or governor - single winner systems are the only option. If there are various officeholders - for instance, for a legislature - there are other voting systems available.Some examples of single winner systems are: Plurality, Runoff voting, IRV, Approval voting, Range voting, Borda count, Minimax, Schulze, and Ranked Pairs. Of these, Plurality and Runoff voting are the most commonly used in conjunction with single-seat constituencies, and their advantages and disadvantages are often conflated with the advantages and disadvantages listed below.
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