Following its political break with Stalin's Russia, Yugoslavia has, since the early 1950s, increasingly turned away from the centralized socialist planning that characterizes the Soviet economic system. The main impulse for the gradual elaboration of a distinctive national system came from two directions. First, the Yugoslav conception of federalism was based on the association of six regions (Serbia, Croatia, Slovenia, Bosnia and Hercegovina, Macedonia, Montenegro) with very distinct national, historical, and social traditions and in different stages of economic development. This meant balancing central economic direction with concern for regional needs and interests. Second, the break with Stalinist Russia in 1948 no doubt stimulated a desire to develop, together with political and ideological independence, a distinctive national economic philosophy of communism in contrast to the overcentralized planning bureaucracy of the Soviet Union.