European societies are becoming ever more diverse, culturally, and ethnically. However, for European societies to prosper citizens must be integrated so that they have shared goals and ambitions. Standing in the way of an integrated and inclusive Europe is the issue of segregation. Segregation (the physical separation of groups into different neighbourhoods) may have negative effects, such as poverty and labour market exclusion among minority groups. Unfortunately, there is no accepted standard for measuring segregation. ResSegr proposes an innovative new solution for this problem. The project aims to define neighbourhoods around individuals instead of administrative borders. This method will produce new socio-economic and ethnic data which can be compared across cities and countries, which produces a much clearer and holistic picture of segregation across Europe. This way of measuring segregation will facilitate the creation of a European database on segregation, which will be tremendously useful for academics and practitioners looking to combat segregation’s negative effects. The project will compare segregation in the cities of Amsterdam, the Netherlands; Brussels, Belgium; Copenhagen, Denmark; Oslo, Norway; and Stockholm, Sweden.