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In this article, I will start with a brief discussion of conceptual issues of migration research, and then focus on two main areas: likely trends in inter- national migration in the years ahead, and perspectives for migrant settlement and their consequences for multicultural societies and transnational communities. I will concentrate on receiving countries, but it is not possible to do so exclusively, as migration is a major force oftransformation in countries of on- gin, and therefore affects their international situation and their relations with receiving countries. Moreover, many countries are both sending and receiving countries for different types of migrants, or are in the process of transition from the one type to the other. Migration, development and international relations are thus closely linked (Castles, 1999, 2000a, 2OOOb)