Institutionalism was the dominant tradition of political analysis until the 1950s. In a sense it can be traced back to classical political theory of Plato(427-347 BCE) and Aristotle (384-22BCE) and was developed by Machiavelli(1469-1527), Hobbes(1588-1679),Locke(1632-1704) and Rousseau (1712-1778) in that such thinkers not only grappled with political ideals such as justice order and freedom but also examined the political institutions most likely too secure these political goods, In the nineteenth and early twentieth centuries this developed into a constitutional-institutional approach to political analysis that emphasised for instance differences between codified and uncodified constitutions parliamentary and presidential systems ad federal and unitary systems. However the institutional approach became distinctively less fashionable in the 1950s and 1960s in the light of the rise of behaviourlism systems theory and subsequently growing interest in Marxism