Keywords: International law, International investment law, StandardFormform, Vienna Convention, ILO, ICSID, non-excluded measures, essential security interests, treaty interpretation In a significant number of international investment agreements, these are provisions that allow States to invoke essential security interests in times of emergency in order to limit the application of substantive contractual agreements. These provisions, largely without explicit intent on the part of the signatory, have given rise to an enhanced debate on their scope and importance, in the light of the recent investor-state arbitration proceedings against Argentina. Law &Society: International &Comparative Law eJournal Subscribe to this paid journal for further articles on the topic 15 Journal of International Economic Law 481 (2012) 28 pages Published: 14 Apr 2012 Last revised: 3 Sep 2014. . . .