The report examines the evolution of the Atlantic Alliance and the uncertainty of the current phase, which consists of forces not always appropriate to its cohesion. Alessandrini analyzes both the transformations in the international context and those inside NATO, the issue of political, economic and military consultation, the debate about the multilateral force and ANF. The conclusion underlines - despite all the current problems - the positive results of the history of NATO, an alliance that represents to date not only the deterrence against possible Soviet threats, but also the most important interlocutor in an eventual East-West dialogue.