“Apparentement” declarations generally have to be made before the election, but it is possible to conceivable to have a system in which such declarations are not disclosed until after the election. In systems involving two rounds of voting, “apparentements” may be authorised only for the second round so as to allow electors to express their choices. “Apparentement” is often subject to conditions. For example, in France, under the 1951 Electoral Act for the election of the National Assembly “apparentement” was permitted only between lists of national parties or groupings, that is to say parties or groupings putting forward candidates in at least thirty départements. It should be added that “apparentements” are sometimes operative only for the allocation of remainders in the basic constituency or in groups of constituencies.