Plurality voting refers to electoral systems in which a candidate who polls more than any other is elected. In systems based on single-member districts, it elects just one member per district and may also be referred to as first-past-the-post (FPTP), single-member plurality (SMP/SMDP), or single-choice (choose-one) voting. A system that elects multiple winners elected at once with the plurality rule and where each voter casts multiple X votes in a multi-seat district is referred to as plurality block voting. A semi-proportional system that elects multiple winners elected at once with the plurality rule and where each voter casts just one vote in a multi-seat district is known as single non-transferable voting.
Single non-transferable vote or SNTV is an electoral system used to elect multiple winners. It is a generalization of first-past-the-post, applied to multi-member districts with each voter casting just one vote. Unlike FPTP, which is a single-winner system, in SNTV multiple winners are elected, typically in electoral districts; additionally, unlike FPTP, SNTV produces mixed representation and makes it unlikely for a single party to take all the seats in a city or a set area, which can happen under FPTP.
The additional-member system (AMS) is a mixed electoral system under which most representatives are elected in single-member districts (SMDs), and the other "additional members" are elected to make the seat distribution in the chamber more proportional to the way votes are cast for party lists. It is distinct from parallel voting in that the "additional member" seats are awarded to parties taking into account seats won in SMDs, which is not done under parallel voting.
First-past-the-post voting is an electoral system wherein voters cast a vote for a single candidate, and the candidate with the most votes wins the election. Analogous systems for multi-winner contests are known as plurality block voting or "block voting" systems; both FPTP and block voting are "plurality" systems in that the winner needs only a plurality of the votes and not an absolute majority. The term first-past-the-post is a metaphor from horse racing of the plurality-voted candidate winning such a race; the electoral system is formally called single-member plurality voting (SMP) when used in single-member districts, and informally called choose-one voting in contrast to ranked voting or score voting.
Parallel voting is a type of mixed electoral system in which representatives are voted into a single chamber using two or more different systems, most often first-past-the-post voting (FPTP) with party-list proportional representation (PR). It is the most common form of mixed member majoritarian representation (MMM), which is why these terms are often used synonymously with each other. In some countries, parallel voting is known as the supplementary member (SM) system, while in academic literature it is sometimes called the superposition method within mixed systems.
A majoritarian electoral system is an electoral system where the candidate with the most votes takes the seat using the winner-takes-all principle and in this way provides majoritarian representation. However, there are many electoral systems considered majoritarian based on different definitions, including types of at-large majoritarian representation such as block voting or party block voting, but district-based majoritarian systems such as first-past-the-post voting (FPTP/SMP). Where two candidates are in the running, the one with the most votes will have a majority, but where there are three or more candidates, it often happens that no candidate takes a majority of the votes.
Lombardy elected its first delegation to the Italian Senate on April 18, 1948. This election was a part of national Italian general election of 1948 even if, according to the newly established Italian Constitution, every senatorial challenge in each Region is a single and independent race.
Lombardy elected its second delegation to the Italian Senate on June 7, 1953. This election was a part of national Italian general election of 1953 even if, according to the Italian Constitution, every senatorial challenge in each Region is a single and independent race.
Lombardy elected its third delegation to the Italian Senate on May 25, 1958. This election was a part of national Italian general election of 1958 even if, according to the Italian Constitution, every senatorial challenge in each Region is a single and independent race.
Lombardy elected its forth delegation to the Italian Senate on April 28, 1963. This election was a part of national Italian general election of 1963 even if, according to the Italian Constitution, every senatorial challenge in each Region is a single and independent race.
A mixed electoral system or mixed-member electoral system combines methods of majoritarian and proportional representation (PR). The majoritarian component is usually first-past-the-post voting (FPTP/SMP), whereas the proportional component is most often based on party-list PR. 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.
The Italian electoral law of 2017, colloquially known by the nickname Rosatellum bis or simply Rosatellum after Ettore Rosato, the Democratic Party (PD) leader in the Chamber of Deputies who first proposed the new law, is a parallel voting system, which acts as a mixed electoral system, with 37% of seats allocated using a first-past-the-post electoral system and 63% using a proportional method, with one round of voting. The Chamber and Senate of the Republic did not differ in the way they allocated the proportional seats, both using the largest remainder method of allocating seats.
Lombardy elected its fifth delegation to the Italian Senate on May 19, 1968. This election was a part of the national Italian general election of 1968 even if, according to the Italian Constitution, every senatorial challenge in each Region is a single and independent race.
Lombardy elected its seventh delegation to the Italian Senate on June 20, 1976. This election was a part of national Italian general election of 1976 even if, according to the Italian Constitution, every senatorial challenge in each Region is a single and independent race.
Lombardy elected its eighth delegation to the Italian Senate on June 3, 1979. This election was a part of national Italian general election of 1979 even if, according to the Italian Constitution, every senatorial challenge in each Region is a single and independent race.
Lombardy elected its ninth delegation to the Italian Senate on June 26, 1983. This election was a part of national Italian general election of 1983 even if, according to the Italian Constitution, every senatorial challenge in each Region is a single and independent race.
Lombardy elected its tenth delegation to the Italian Senate on June 14, 1987. This election was a part of national Italian general election of 1987 even if, according to the Italian Constitution, every senatorial challenge in each Region is a single and independent race.
Lombardy elected its eleventh delegation to the Italian Senate on April 5, 1992. This election was a part of national Italian general election of 1992 even if, according to the Italian Constitution, every senatorial challenge in each Region is a single and independent race.
Mixed member majoritarian representation (MMM) is type of a mixed electoral system combining majoritarian and proportional methods, where the disproportional results of the majoritarian side of the system prevail over the proportional component. Mixed member majoritarian systems are therefore also as a type of semi-proportional representation, and are usually contrasted with mixed-member proportional representation (MMP) which aims to provide proportional representation via additional compensation ("top-up") seats.
The next Italian general election will occur no later than 22 December 2027, although it may be called earlier as a snap election.
