STV

Gabrielle Hamer
Mind Map by Gabrielle Hamer, updated more than 1 year ago
Gabrielle Hamer
Created by Gabrielle Hamer over 6 years ago
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Explanation of STV

Resource summary

STV
  1. Employs large multi-member constituencies. Voters may indicate as many preferences on their ballots as there are seats to fill, by numbering their choices (1, 2, 3 etc). In order to be elected, a candidate must achieve a quota - normally calculated using the Droop Formula
    1. (Total valid votes cast / seats in constituency +1) +1
    2. For example, in a 5-member constituency, a candidate would need to secure a sixth of the votes plus 1, as such a quota could only be achieved by 5 candidates.
      1. If 600 votes are cast, the candidate would need 101 votes to be awarded a seat.
      2. Once a quota is met, surplus votes for that candidate are transferred in accordance with 2nd preferences. Where no candidate is elected on 1st preferences, the lowest -placed candidate is eliminated & their votes redistributed. This process continues until all of the available seats have been filled.
        1. Aims to improve voter choice, achieve clear proportionality and eliminate wasted votes through a complex system of vote transference.
          1. Proportional system used in many elections in NI, in Scottish local (since 2007) and Eire.
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