Abstract
The purpose of this paper is to review the historical developments of the planning systems in the socialist countries from the controlability point of view and to indicate the direction to be pursued. The "mixed model" of the 1965 and after can be taken to be an trial to overcome the difficulties of the centralised model which intends to control the whole economy as "one factory". However, more than 17 years experience of this model in the USSR shows that this too has its own difficulties. At the same time, even the more reformed model in Hungary with its heavy emphasis on market orientation is not free from many contradictions, the typical one being reflected in the dilemma between "the efficiency system and the socialist value system" and it is pointed out that the future model must be constructed upon the acknowledgement of these limitations of the parametric control model.
