Ethnologists have shown an interest in migrations since only the mid of the 80's. Using postclassical and poststructuralist theories they have analyzed the problems resulting from a decreasing classical workers' immigration and the passage to postclassical forms of migration. Cultural problems are getting less important compared wih topics such as migration and health, urban integration policy, naturalization, and state policy in matters of migrations. It is only in the future that one will be able to determine wether this new form of cooperation between science and politics, that the ones qualify as pragmatic, the others as praxeologic, does not raise new ethic problems.