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Immigration policies in most host nations of the west have undergone significant changes in recent years. Based on the four country-specific papers that appear in this section of the journal, and also on our own research, we present an overview of these changes and their context. In all countries, economic considerations play a central role in shaping immigration policy and greater importance is given to scientific research. Several common policy changes are noted in Australia, Canada and New Zealand which include: a shift away from a human capital focus toward more targeted selection based on labor market demand for specific skills, increased emphasis on temporary foreign worker programs, attraction of international students, an overhauling of the refugee system, and regionalization of immigration. In the U.S., while adoption of some of these changes has often surfaced in public policy and academic discussions, legalization of unauthorized migrants remains an important policy debate, with recent arguments focusing on the economic benefits of legalization. [ABSTRACT FROM AUTHOR]