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In political science, parallel voting or superposition refers to the use of two or more electoral systems to elect different members of a legislature. More precisely, an electoral system is a superposition if it is a mixture of at least two tiers, which do not interact with each other in any way; one part of a legislature is elected using one method, while another part is elected using a ...
An electoral system (or voting system) is a set of rules that determine how elections and referendums are conducted and how their results are determined.. Some electoral systems elect a single winner (single candidate or option), while others elect multiple winners, such as members of parliament or boards of directors.
This is distinct from other mixed electoral systems that use parallel voting (superposition) or compensatory voting. For example, the rural-urban proportional (RUP) proposal for British Columbia involved the use of a fully proportional system of list-PR or STV in urban regions, combined with MMP in rural regions. [3]
MSV is a type of mixed systems using only a single vote that serves both as a vote for a local candidate and as a party list vote, split ticket voting is not possible. The system was used in Germany in a mixed proportional system, [ 12 ] and is currently used in Hungary as a semi-proportional system as well as Italy in a non-compensatory system.
For example, in the 2008 New Zealand general election the Māori Party won 2.4% of the party vote, which entitled it to 3 seats in the House but won 5 constituency seats, leaving an overhang of 2 seats. This was compensated for giving two additional seats to other parties, which resulted in a 122-member house.
Vote linkage systems can be compared to the mixed-member proportional systems (MMP)/ additional member system (AMS) and the common form of mixed-member majoritarian representation, parallel voting. Like in parallel voting, a party that can gerrymander local districts can win more than its share of seats. So parallel systems need fair criteria ...
Reforms can include changes to: Voting systems, such as adoption of proportional representation, Single transferable voting,a two-round system (runoff voting), instant-runoff voting (alternative voting, ranked-choice voting, or preferential voting), Instant Round Robin Voting called Condorcet Voting, range voting, approval voting, citizen initiatives and referendums and recall elections.
Semi-proportional voting systems are generally used as a compromise between complex and expensive but more-proportional systems (like the single transferable vote) and simple winner-take-all systems. [2] [3] Examples of semi-proportional systems include the single non-transferable vote, limited voting, and parallel voting.