The territory of Italy is divided into 100 constituencies electing between 3 and 9 deputies depending on their size. For each constituency, the parties designate a list of candidates: "head of list" candidates can run in up to 10 constituencies, while other candidates are limited to a single constituency. Gender balance is promoted by requiring that, in each region, head of lists of either sex for the same party should not exceed 60% of the total; additionally, candidates in all lists must be in a sequence alternating by gender.