1916- . French socialist politician, president from 1981. He held ministerial posts in 11 governments 1947-1958. He founded the French Socialist Party (PS) 1971. In 1985 he introduced proportional representation, allegedly to weaken the growing opposition from left and right. Mitterrand studied law and politics in Paris. During World War II he was prominent in the Resistance. He entered the National Assembly as a centre-left deputy for Nievre. Opposed to Gen de Gaulle's creation of the Fifth Republic 1958, he formed the centre-left anti-Gaullist Federation of the Left in the 1960s. In 1971 he became leader of the new PS. An electoral union with the Communist Party 1972-77 established the PS as the most popular party in France. Mitterrand was elected president 1981. His programme of reform was hampered by deteriorating economic conditions after 1983. When the socialists lost their majority Mar 1986, he was compelled to work with a right-wing prime minister, Jacques Chirac, and grew in popularity. He defeated Chirac to secure a second term in the presidential election May 1988.