A grand coalition is an arrangement in a multi-party parliamentary system in which the two largest political parties of opposing political ideologies unite in a coalition government. The term is most commonly used in countries where there are two dominant parties with different ideological orientations, and a number of smaller parties that have passed the election threshold to secure representation in the parliament. The two large parties will each try to secure enough seats in any election to have a majority government alone, and if this fails each will attempt to form a coalition with smaller parties that have a similar ideological orientation. Because the two large parties will tend to differ on major ideological issues, and portray themselves as rivals, or even sometimes enemies, they will usually find it more difficult to agree on a common direction for a combined government with each other than with smaller parties.