The transformation of the political environment of Western Europe in the mid-1960's has been only partially completed. On the one hand, in many economic sectors relations among the six members1 of the European economic communities are set within the context of a new process and a new institutional method of community building and are being modified by the notion of a common interest beyond six sets of national interests. But, on the other hand, the relations among the Six in the “political” realm—that is, in the sphere of foreign and defense policy—have not yet been transformed by common institutions. It is in this area that the confrontation between traditional methods of interstate relations and the new community m thod is currently taking place, and it is here that the ultimate validity of the concept of European unification will face its most difficult test. Therefore, a crucial question in Europe today is whether or not the Six will be able to organize their political life on a collective basis as they have done in many economic sectors.