In 2018, over 37% of the permanent resident population of Switzerland aged 15 and over had a migration background. While 30% belonged to the first generation, over 7% were part of the second generation. This population represents the population for which integration into Swiss society is to be measured.
To measure integration, the reference typology of the population by migration status is adapted slightly: The population with a migration background includes all persons with foreign nationality (including third generation foreigners). This population also includes first generation naturalised Swiss citizens, second generation naturalised Swiss citizens with at least one parent born abroad and Swiss nationals from birth both of whose parents were born abroad.