A prime minister is chosen by members of the legislature (what they call Parliament) from among their own number and, in practice, is the leader of the majority party in the legislature. The cabinet members must also belong to the legislature, where they are subject to the same kind of questioning that the prime minister experiences. If the prime minister loses the support of the majority in the legislature on a significant vote, he or she must resign, and elections are called immediately. Unitary system Parliamentary system Confederal system Federal system