THE 1986 ELECTION WAS THE BEGINNING OF ‘COHABITATION’ and 1988 was the end of it — at least of the Fifth Republic's first experience of it. Cohabitation between the President and a Prime Minister who was his chief political adversary was to be the last great test of the stability and adaptability of the Fifth Republic's political institutions. It had been the dominant theme in 1986 just as the fearsome prospect of cohabitation between left-wing parliamentary majorities and previous presidents had been to the forefront in the parliamentary elections of 1978 and even 1973. It was as the President of cohabitation that FranGois Mitterrand won his extraordinary 1988 victory. The survival of presidential legitimacy against the onslaught of prime ministerial power is what the 1988 presidential election will be remembered for. This is the principal theme of this article.