When voting, each elector is called on to make a choice and one of the functions of the electoral system adopted is to govern how that choice is expressed. On the basis of the choice which the elector is asked to make, a distinction can be made between “categorical” voting methods which require the voter to make an absolute choice and “ordinal” voting methods under which the voter may qualify his or her choice. It should be made clear immediately that this analysis variable has no direct impact on the fragmentation of the party system and elected assemblies.