During the thirteenth Knesset (1992–1996) it was decided to hold a separate ballot for prime minister modeled after American presidential elections. This system was instituted in part because the Israeli electoral system makes it all but impossible for one party to win a majority. While only two parties—Mapai/Labour and Likud—had ever led governments, the large number of parties or factions in a typical Knesset usually prevents one party from winning the 61 seats needed for a majority.