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Electoral Reform
Select Country / Region
Click any button to explore how elections could look under different electoral systems
Majoritarian Systems
Input your expected vote shares for all parties to see how many seats they could win. This creates a complete constituency level projection.
Just make sure they sum to 100%.
Preset Scenarios
Click a scenario to automatically fill the form with preset values:
Electoral System
Choose between First Past the Post or the Alternative Vote:
Results
Constituencies Map
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Additional Member System (AMS)
Input your expected vote shares for all parties to see how many seats they could win. This creates a complete constituency level projection.
Just make sure they sum to 100%.
Preset Scenarios
Click a scenario to automatically fill the form with preset values:
Region Configuration
Choose how list seats are allocated:
AMS Map
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Single Transferable Vote (STV)
Input your expected vote shares for all parties to see how many seats they could win. This creates a complete constituency level projection.
Just make sure they sum to 100%.
Preset Scenarios
Click a scenario to automatically fill the form with preset values:
STV Configuration
Choose the STV region size:
STV Results
STV Regions Map
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List Proportional Representation
Input your expected vote shares for all parties to see how many seats they could win. This creates a complete constituency level projection.
Just make sure they sum to 100%.
Preset Scenarios
Click a scenario to automatically fill the form with preset values:
List PR Configuration
Choose the region size:
PR Groupings Map
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The options provided give an idea of what future electoral reform could look like. All are based on current constituency boundaries but with nearby constituencies combined in different ways to mimic PR systems currently used other countries.
The example systems provided are all based on the current electoral systems in use in other modern democracies. We measure the Gallagher Index for each result to show how close it is to the wishes of voters and the Effective Number of Parties to show how divided the results are.
The difference between Open and Closed Lists is not distinguished here. In the real world, Closed lists allow parties to pick the order of their candidates whilst Open lists let voters override the party's preferred order. This can change which person wins a seat, but not which party they are from.