Electoral list in the context of "Mixed single vote"

An independent politician or non-affiliated politician is a politician formally not affiliated with any political party. In accordance with the applicable electoral law which regulates electoral process in a representative democracy, such non-affiliated politicians are not nominated by political parties, but most commonly by a qualified number of citizens, thus becoming independent candidates, or civic candidates. As in the case of party-candidates, an independent electoral candidacy can be individual (a single independent candidate for a single-seat electoral unit), or collective (electoral list of independent candidates for a multi-seat electoral unit).

Politicians may also become independents after losing or repudiating affiliation with a political party. Independents sometimes choose to form a party, alliance, or technical group with other independents, and may formally register that organization. Even where the word "independent" is used, such alliances can have much in common with a political party, especially if there is an organization which needs to approve the "independent" candidates.

A mixed electoral system is one that uses different electoral systems to elect different seats in a legislature. Most often, this involves a First Past the Post combined with a proportional component. The results of the combination may be mixed-member proportional (MMP), where the overall results of the elections are proportional, or mixed-member majoritarian, in which case the overall results are semi-proportional, retaining disproportionalities from the majoritarian component. Systems that use multiple types of combinations are sometimes called supermixed.

Mixed-member systems also often combine local representation (most often single-member constituencies) with regional or national (multi-member constituencies) representation, having multiple tiers. This also means voters often elect different types of representatives who might have different types of constituencies. Some representatives may be elected by personal elections where voters vote for candidates, and some by list elections where voters vote for electoral lists of parties.

Mixed-member proportional representation (MMP or MMPR) is a type of representation provided by some mixed electoral systems which combine local winner-take-all elections with a compensatory tier with party lists, in a way that produces proportional representation overall. Like proportional representation, MMP is not a single system, but a principle and goal of several similar systems. Some systems designed to achieve proportionality are still called mixed-member proportional, even if they generally fall short of full proportionality. In this case, they provide semi-proportional representation.

In typical MMP systems, voters get two votes: one to decide the representative for their single-seat constituency, and one for a political party, but some countries use single vote variants. Seats in the legislature are filled first by the successful constituency candidates, and second, by party candidates based on the percentage of nationwide or region-wide votes that each party received. The constituency representatives are usually elected using first-past-the-post voting (FPTP). The nationwide or regional party representatives are, in most jurisdictions, drawn from published party lists, similar to party-list proportional representation. To gain a nationwide representative, parties may be required to achieve a minimum number of constituency seats, a minimum percentage of the nationwide party vote, or both.

The additional-member system (AMS) is a two-vote seat-linkage-based mixed electoral system used for elections to the Scottish Parliament in the United Kingdom, although not for Westminster elections, in which most representatives are elected in single-member districts (SMDs), and a fixed number of other "additional members" are elected from a closed list to make the seat distribution in the chamber more proportional to the votes cast for party lists. It is a form of mixed-member proportional representation and is distinct from using parallel voting for the list seats (also known as the supplementary-member system) in that the "additional member" seats are awarded to parties taking into account seats won in SMDs (referred to as compensation or top-up) – these are ignored under parallel voting, which is a non-compensatory method.

AMS is the name given to a particular system used in the United Kingdom that aims to provide proportional representation. However, in theory it can fail to be proportional. This is commonly caused by dis-proportional district results caused by seat overhang. The proportionality of AMS depends on having enough additional ("top-up") seats and on how votes are cast in a specific election. During its use in the United Kingdom, AMS produced results closer to mixed-member proportional rather than mixed-member majoritarian representation.