J. De Soto, M. Keywords: European Coal and Steel Community | International relations | Mots clefs: Communauté européenne du charbon et de l acier | Relations internationales | ABSTRACT M. J. De Soto explains in the introduction to his course that the external competence of an international institution is less evident than the external competence of a State. There can be no question of competence of war. The author explains by quoting Reuter that the external competence means the right to participate in international affairs…