In the EP, as the EU, the figure of the expert seems inescapable dimension of role definition and structuring of space. This article aims to show that the figure of the expert MEP corresponds to a well-founded illusion, a simplification whose credibility is sitting on institutionalized social processes. This institutional structure is the product of the encounter between a context and social properties and policies that crystallize in the role of the expert. This dominant definition of the function of MEP carries a number of consequences and constraints. However, it still remains subject to tensions and competing investments that make the institutionalization of PE a dynamic process.
