ID is the multidisciplinary unit for social demography and population studies at the Vrije Universiteit Brussel (VUB). The main objective of ID is to address socio-demographic challenges related to social sustainability from a multidimensional perspective revolving around the notion of equity as a ‘cross-cutting theme’. The research program gravitates around six mutually interconnected research lines: (1) sustainable work and employment; (2) sustainable living environments; (3) equitable and non-discriminatory social relations; (4) global population issues and migration; (5) inequality in health and mortality and (6) data and research infrastructure.