This paper reviews the comparative multi-level quantitative research on the links between integration policies, the integration situation of immigrants and a wide range of individual and contextual factors. Twenty-one reviewed studies and additional supporting articles indicate that a number of individual and contextual variables explain most of the variation between countries in terms of immigrants’ labour market integration, educational attainment, naturalisation and political participation. Thanks to the use of MIPEX and similar indices, some evidence is emerging that certain integration policies can be related to the specific integration outcomes that they aim to address. This review illustrates that future research needs to pay greater attention to linking a specific integration policy with its actual target group and target outcomes. Studies must also take into account time-sensitive contextual factors and general policies. International surveys can improve their measurement of integration policy outcomes in terms of long-term residence, family reunification, anti-discrimination, language learning, and, to some extent, political participation.
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