Defined as a ‘combination of diverse shares of social groups in a neighbourhood’. A social group has one or more factors in common, such as having similar economic resources (i.e. having low- or high-income), the same ethnic background or nativity (i.e. born in the same country), the same household structure (e.g. families with children or households of young singles) or the same tenure (i.e. being tenants or home owners/buyers).