Migration Mobility Survey, waves 2016, 2018 and 2020. Codebook and metadata along DDI standard. The third wave of the Migration-Mobility Survey took place during the fall of 2020. Seven thousand three hundred-ninety three migrants were surveyed, 3282 of whom were surveyed 2 years ago (Panel). The remaining 4111 comprised the so-called Refresh sample. Among the 3282 members of the panel, 1293 where already interviewed in 2016. The topics included the migratory trajectory before arriving in Switzerland, characteristics of the arrival, information on the family, education level, labour market participation and topics referring to social integration and life in Switzerland. The 2020 wave also include a specific module referring to the Covid-19.