Abstract

In several avenues of contemporary research, much attention is devoted to the contrast between the real authority of institution and their formal power, in the analysis of institutional funtionings; also in the study of the relationships between institutions on the one hand, rules, principles or norms on the other hand. Such a contrast appears to be based on familiar observations: the capacity of institutions to get their preferred outcomes is sometimes loosely connected with the hierarchical prerogatives of the considered institutions. More particularly, current studies of the „migration authority” bring out possible shitts in real authority while there is no changein the formal structure of power. This article will partly consist in the explanation of recent results of common reaserch in project „Delicom”, in which a formal treatment of the distinction has been put foward. This approach will be set against the background of recent contributions in political science or economics. The revelance of the problematic for the study of competence delegation among institutions will be stressed all along.