Under Article 58 of the Italian Constitution, any voter of 40 years of age or over can be elected. He or she may be proposed to stand for election by political parties, political groups or individual citizens. The candidates compete for the attribution of a seat in a single-member constituency. Those candidates who form associations between themselves compete on a group basis and thus also for the seats assigned on a proportional basis. The symbols and names of lists are filed with the Ministry of the Interior. Later, the names of the candidates standing for a seat are also filed therewith.