Abstract
The current proliferation of intergroups in the Italian Parliament can be considered a phenomenon strictly related to the ongoing transformations of political mediation and of parliamentary compromise. In the analysis that follows, it is described as the most recent demonstration of the traditional internal dynamism of parliamentary assemblies and interpreted as a further and most meaningful shifting of the parliamentary system, also in the perspective of the increasing fluidity of political representation as well as of the poor consistency of the social issues that should be represented in the parliament. The approach we adopt is multidisciplinary, in fact the topic is analyzed both from a public law and a quantitative perspective, using newly collected data on the dynamics of intergroups. This methodology is also applied to other parliaments.