Immigration into Sweden during the last 60 years has mainly taken place in three waves. The first wave comprised refugees who arrived during the war or at the end of the war. The second wave went on from the late 1940s up to the mid 1970s, primarily consisting of European labour immigrants. The third wave is largely made up of non-European refugees and their relatives. Swedish research on immigrants' social, labour, market and economic situation has essentially dealt with the second and third immigration waves and their children born in Sweden. In contrast, less information about these aspects is available concerning the first wave. We lack a systematic knowledge of how this group and its Swedish-born children and grandchildren have managed in the long run. This lack is probably due to the lack of high-quality data. However, with the longitudinal register built up within the Department of Economics at Växjö university and supplemented by recently conducted development work at Statistics Sweden, the situation has improved. The register is suitable for the use of advanced econometric methods. Economists at Växjö university have for many years developed research in the field international migration.