Centrality areas usually have cleared defined features: reasonable densities, mixed uses, accumulation of functions with social facilities, free spaces and accessibility. They are opportunity attraction spaces for the employment market and, consequently, they can be defined as spaces of intensive sociability.

The metropolitan area of Barcelona is a multicentric territory with heterogeneity of centres. In this regard, both historic and more contemporary centres linked to the new metropolitan dynamics, as well as open spaces. The way to address this diversity of centres might be the significant contribution that the metropolitan plan could give to the new urban planning.

Another important aspect for these new citizen relationships is the link between the centres, and for this reason it is necessary to ensure first-rate public transport and strengthen metropolitan streets and avenues that join this heterogenous constellation of centres.