-party system is a system in which multiple political parties across the political spectrum run for national election, and all have the capacity to gain control of GOVERNMENT offices, separately or in coalition.[1] Apart from one-party-dominant and two-party systems, multi-party systems tend to be more common in parliamentary systems than presidential systems and far more common in countries that use proportional representation compared to countries that use first-past-the-post elections. First-past-the-post requires concentrated areas of support for large representation in the legislature whereas proportional representation better reflects the range of a population's views. Proportional systems may have multi-member districts with more than one representative elected from a GIVEN district to the same legislative body, and thus a greater number of viable parties. Duverger's law states that the number of viable political parties is one plus the number of seats in a district. Argentina, Austria, Belgium, Brazil, Croatia, Denmark, Finland, France, Germany, Iceland, India, Indonesia, Ireland, ISRAEL, Italy, Lebanon, Maldives, Mexico, Moldova, Nepal, the Netherlands, New Zealand, Norway, Pakistan, the Philippines, Poland, Portugal, Romania, Serbia, Spain, Sri Lanka, SWEDEN, Switzerland, Taiwan, Tunisia and Ukraine are examples of nations that have used a multi-party system effectively in their DEMOCRACIES. In these countries, usually no single party has a parliamentary majority by itself. Instead, multiple political parties are compelled to form compromised coalitions for the purpose of developing power blocks and attaining legitimate mandate.