The workshop is organised in the framework of the Horizon 2020 project Integrating Diversity in the European Union (InDivEU) and is primarily an occasion for the researchers participating in Work Package 2 on Legal Feasibility and Constitutional Acceptability of Differentiated Integration to discuss the outcome of their work. Project members will present their reports and/or related publications. In order to enrich the debate, other scholars working on differentiated integration are invited to present their research or to act as discussants. The morning session of the workshop will deal with general aspects of internal differentiation (between EU member states), whereas the afternoon session will address differentiated integration in particular policy areas as well as external differentiation (in the relations between the EU and third countries).