About 19% of the population living in Germany possesses a migration background. A migration background is given if the person or its physical parents is born abroad and if the persons or his/her parents possesses a foreign citizenship or did so in the past. More than half of the persons with migration background, i.e. 10% of Germanys population, possesses the German nationality and/or the legal status of a German without German nationality (status German). The portion of the foreign population amounts to 9% of the total population in Germany. In that project, the following questions have been analyzed: 1) Characterisation of the different groups of persons with migration background (e.g. repatriates, former immigrant workers) on the basis labour market-relevant characteristics. 2) Determination of the education net yields, whereby differences in composition and significance of the measured variables are to be identified. The regulation is to take place thereby for the different groups with migration background and in the comparison to the reference group, German nationals without migration background. 3) Investigation of wage inequality: The analyses are based on data from the German Socio-Economic Panel (SOEP) and the Microcensus for the year 2005.