This dissertation proposal, first, outlines the different partner choice decisions a migrant can make,the current state of research on migrants' marriages, and the available data sources to study these. Second, it lays down a micro-level theoretical foundation of the three thematically related research projects, based on theexchange and value-expectancy theories. The frrst two subprojects intend toinvestigate the detennining factors of migrants' mate selection, h_ighlighting the decisionof choosing a partner from the (parental) country of origin. The focus will particularly be on cultural factors, e.g., religious norms and the influence of the family. I will analyze the relevance ofthese factors with data from the "The Integration ofthe European Second Generation" (TIES)survey. The second project will investigate this topic longitudinally with data from the "Socio-Economic Panel" (SOEP). Finally, to explain the low rates of intermarriage with the German native population, the third research project will study Germans' attitudes towards migrants, their determinants, and their effect on their actual marriage behavior with data from the "Gennan General Social Survey" (ALLBUS).