Vienna formula --- Yes, the Vienna formula is in force. It is part VIII of the Vienna Convention on the Law of Treaties (1969). The Vienna Convention is also called 'treaty of treaties' as it regulates how international treaties are defined, drafted, amended, interpreted, etc. When following the Vienna formula here, only UN member states or UN agencies are allowed to participate. The UN member state then can decide whether it would like to do so.

Source author: Pavlina Ittelson pavlinai@diplomacy.edu