The Six Country Immigrant Integration Comparative Survey (SCIICS) is a large-scale telephone survey conducted in 2008. The aim was to collect comparable data across European countries (the Netherlands, Germany, France, Belgium, Austria and Sweden) with different integration policies as well as...

The question whether ethnic diversity is associated with declining social cohesion has produced much controversy. We maintain that more attention must be paid to cognitive mechanisms to move the debate ahead. Using survey data from 938 localities in Germany, France, and the Netherlands, we...

In this article, we first test theories on immigrant rights across 29 countries from Europe, Africa, the Middle East, East Asia, Oceania, and the Americas, using our Indicators of Citizenship Rights for Immigrants (ICRI) data set. We focus on trajectories of nationhood and current institutional...

Ethnic diversity is typically measured by the well-known Hirschman-Herfindahl Index. This paper discusses the merits of an alternative approach, which is in our view better suited to tease out why and how ethnic diversity matters. The approach consists of two elements. First, all existing...

In this article we develop and test an encompassing theoretical framework for explaining the geographical and temporal spread of extreme right violence. This framework combines structural factors related to ethnic competition, social disintegration, and political opportunity structures, which...