Book excerpt: The Migrant Integration Policy Index (MIPEX) is a unique comparative study on indicators of the legal integration of third-country nationals. Though comparing countries on the basis of various indicator types is common in the private sector and increasingly used in policy areas like development, good governance and equality, the exercise remains relatively new in justice and home affairs. The book lays out the instruments used to construct the MIPEX and then situates the study within current debates on integration indicators and policy evaluation. Each chapter considers what the study s key findings add to our understanding of the state of integration policy development across Europe and of recent legal and policy trends on anti-discrimination, naturalisation, labour market access, and political participation.