The studies carried out within this research axis are centred on the evaluation of the justice and legitimacy of social institutions, conceived as bodies of rules allowing cooperation between individuals on both national and international scales. This task is twofold. Firstly, it involves examining the foundational concepts and arguments of contemporary political practices (freedom, equality, tolerance, deliberation, representation, etc.). Secondly, it involves studying the application of these concepts to particular institutional frameworks such as schools, the healthcare system, judicial institutions, etc. The studies carried out by the members of this axis are organized around four research projects which encompass cross-disciplinary collaborations.