Additional Member System
The Additional Member System is an electoral system used to produce a more proportional result than Plurality voting, also known as First Past The Post. It is s…
The Additional Member System is an electoral system used to produce a more proportional result than Plurality voting, also known as First Past The Post. It is sometimes referred to as Mixed Member Proportional but these two electoral systems have different ways of allocating list seats. The term additional member system is almost only used in the United Kingdom but has been used to describe Italy's Electoral system from 1993 to 2005.
Method of voting & calculation
Method of voting
In the Additional Member System the voter has two votes ; one vote goes to an local representative or multiple representatives from a geographical electoral district. This is commonly referred as a constituency vote. The other vote goes to a political party. This is commonly referred as a list vote and is to represent the voter in a wider region.
Calculation
Firstly, the Constituency vote is counted: the votes are counted and the candidate with the most votes, even if the candidate did not reach a majority, wins the seat.
Next, each party's Member Score is calculated using a formula:
V = Party List Vote
S = Seat already won
Once the party's member score is calculated the list seats are given to each political party using the D'hondt formula.
Example
In this Hypothetical Example there is 100,000 voters and there are: 3 political Parties, 10 total Seats (6 constituency seats and 4 list seats).
| Party | Constituency | Party List | Total
Seats |
Total Seat
Share | ||||
|---|---|---|---|---|---|---|---|---|
| Votes | Vote
Share |
Seats | Votes | Vote
Share |
Seats | |||
| Party X | 43,000 | 43% | 4 | 45,000 | 45% | 1 | 5 | 50% |
| Party Y | 36,000 | 36% | 2 | 36,000 | 36% | 1 | 3 | 30% |
| Party Z | 21,000 | 21% | 0 | 19,000 | 19% | 2 | 2 | 20% |
List seats calculation
| Party | Votes | Member
Score |
/1 | /2 | /3 | /4 | Seats
Allocated |
|---|---|---|---|---|---|---|---|
| Party X | 45,000 | 9,000 | 9,000 | 4,500 | 3,000 | 2,250 | 1 |
| Party Y | 36,000 | 12,000 | 12,000 | 6,000 | 4,000 | 3,000 | 1 |
| Party z | 19,000 | 19,000 | 19,000 | 9,500 | 6,333 | 4,750 | 2 |
Current usage
References
- ↑ "London Elections: How The Voting System Works". Londonist. 2012-05-02. Retrieved 2017-10-25.
- ↑ "Scottish Parliament Fact sheet: Scottish Parliament Electoral System" (PDF). Archived from the original (PDF) on 2017-11-07.
- ↑ Owen, Paul (2007-02-05). "How the Welsh electoral system works". The Guardian. ISSN 0261-3077. Retrieved 2017-10-25.
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