Additional Member System - Calculation Methods

Calculation Methods

At the regional or national level (i.e. above the constituency level) several different calculation methods have been used:

  • In the Scottish model of AMS, the regional seats are divided using a D'Hondt method. However, the number of seats already won in the local constituencies is taken into account in the calculations for the list seats, and the first average taken in account for each party follows the number of FPTP seats won. Similar system are used in Wales and London.
  • In the Italian model of AMS, used 1993-2005, for every constituency seat won by a party, that party's vote total was reduced by the number of votes received by the second-place candidate in the constituency, subject to the condition that the deduction cannot be less than either 25% of the total votes cast in the constituency, or the votes received by the winning candidate, whichever is less.

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