With its sixteen years, experience of pluralism, the FDF appears to represent a new type of political party in Belgian politics. Owing to the multiplicity of its origins the federalist party of Brussels was obliged in an initial stage to reconcile manifold philosophical, ideological and political tendencies; in later years it has succeeding in giving an even more concrete contents to this pluralism. lt now consciously tends to make this pluralism a political advantage in its competition with the traditional parties. Both the evolution and the structure of the party were strongly determined by this specific characteristic.