The social exclusion is the process by which determined individual and groups have systematically blocked their access to positions that would allow an independent subsistence them within the social levels determined by the institutions and the values in a given context (Castells, 1998, P. 97 – 99). The definition expresses a dynamic phenomenon that can affect to different groups at different moments from its vital trajectory, and that contains a great diversity of explanatory factors. For Ricard Gom and Joan Subirats (2003, P. 127 – 128), as structural phenomenon implies in " sprouting of a new social split in term of inside/fuera" and as multi-factor and multidimensional phenomenon points " an accumulation of unfavorable circumstances strongly interrelacionadas" – sort, age, ethnic origin, incapacity, type of home, social class: scholastic failure, labor uncertainty, weakness of affective bonds, infra house and on incidence of diseases. A PARADIGM DE Participation the changes lived in Barcelona would be influenced by the effective crisis in the system of political representation of the present time that was demanding the conformation of new democratic models that contemplated the necessity of the individuals to exercise their participation in the deliberations of the governments. As it affirms Celso Capilongo (1987, P. 96 – 97), the aging of the traditional practices remains latent to make policy and generally the system of political representation went to the length of the time revealing itself little qualified for the function of social integration and production of collective identities, showing more and more acute its incapacity to filter the social demands and transfrmalas in political decisions. Ismael Blanco and Ricardo Rubber (2002, P. 7) describe the crisis of the model of traditional government like departure point for a new logic of governability: " the traditional democratic government is today with increasing difficulties to react of effective and efficient way before complex, uncertain and more and more dynamic surroundings, and the democratic legitimacy of the public institutions is deteriorated before a reflective and more and more critical citizenship, with new values that cannot satisfy with simple the technocratic provision with services pblicos." The moment historical it has produced in Barcelona like in many other places in the world, the necessity to legitimize itself to action of new political institutions that happened to integrate new emergent subjects and that universalised the strategy of participating citizenship.