Mixed Member Proportional / Additional Member System
This election type is not available yet.
Description: AMS (Additional Member System)
MMP (Mixed Member Proportional) or "Top-Up"
SUP (Supplementary Member) or Parallel Voting
Often use a threshold of exclusion.
History: Fairly New System that has been widely adopted.
It was answer to making the counting process in a Quota Preferential Proportional Representation election a lot simpler.