While in plurality/majority systems in SMDs, only individual (party) candidatures are possible, in PR systems different list forms are applied. Such lists may be closed, open or free. With closed lists the political parties determine the ranking order of candidates on the electoral ballot, and the voter endorses the entire list without any possibility of changing the order in which the seats are allocated to the candidates. In contrast, with open lists the voter may express a preference for particular candidates by casting a certain number of preference votes, thus changing the ranking order of the list. With free lists, the voter may even choose between candidates from different lists.