It has become evident to most of us, I believe, that the language and ideas of the Cold War are no longer adequate as a guide to international politics today. For almost twenty years, the basic notions of the Cold War have dominated our thinking about world affairs, but these notions are in need of change. This is not because the conflict of purposes described by the Cold War no longer exists, but because this conflict is no longer the dominating fact of international politics and because the sources of this conflict have been changing. We are more than ready for some fresh conceptual approaches to deal with the complex currents which are now transforming the political world in unfamiliar ways.