Document Type : Article


1 Assistant Prof., Department of International and Public law, Farabi Faculty, University of Tehran, Tehran, Iran

2 Ph.D. Student in International Law, Farabi Faculty, University of Tehran, Tehran, Iran


Since the emergence of the international organizations, it was presumed two functions for these new entities: international organizations as independent actors and as vehicles for States. In light of these two functions, two points of view about legal nature of the law produced inside IOs are raised. According to the first point of view (constituent instruments as constitution) rules of international organizations just like rules of States, were considered part of the internal law of IOs and isolated from international law. According to the second point of view (constituent instruments as a contract) rules of organizations were merely part of international law. Each of these two views has totally different effects on areas of characterization of acts, international responsibility and sequence of rules of international organizations. In this article after enumerating gaps and insufficiencies of each of these two views, it is argued that adoption of a two-dimensional (internal and international) approach regarding nature of rules of international organizations, while protecting the legal autonomy of international organizations, will help to prevent fragmentation of international law.


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