How is it possible to get many nations, separated by history, culture, political structures, to live together? If the European community functioned well with 6 members, in a mediocre way at 9, and at 12 members with difficulty, beyond, the E.E.C. will be ineffectual and paralyzed. One solution is available: to change the institutions. The author, a former member of the European Parliament, proposes here a new theory of federalism, the only way according to him, to progressively substitute to the power of the technocrats that of the members of Parliament and citizens.