Abstract
International organizations, for the purpose of further considerations are these established by multilateral treaties constituting their internal legal order and establishing legal personality for them, which is independent and separate from their member states. The emphasis in this article is on the UN and its Specialized Agencies. Since in practice their constituent instruments are interpreted on the daily basis in the continuous process of performing their functions and filling the gaps, some of extensive interpretations may lead to informal modifications of the constitutional instruments. To examine whether there are any limits to the dynamic / evolutive (extensive) interpretations is of grave significance both for international law doctrine and practice, as well as political reality. In conclusion: the Report and the IDI Resolution adopted on 4th September, 2021, are the good ground for better understanding of recent developments in the daily lives of the UN System.