Ethnic identity is central to many contemporary discussions of belonging and assimilation of migrant-origin youth. Studies typically focus on a single minority identity. Identity theory implies, however, that individuals may hold multiple ethnic identities, or none, and these may find expression to a greater or less extent depending on context. Using a nationally representative, longitudinal study of Dutch teenagers, we investigate the role of classroom ethnic composition in shaping multiple ethnic identity expression. Framing identity choices as a relational process, we show that the number of ethnic identities that children with a migrant-origin background choose is greater for those students who are exposed to a more ethnically diverse context, while less diverse classrooms foster ethnic identification with no or fewer minority groups. Classification of migrant-origin students with a single (minority) ethnicity may thus be an oversimplification of ethnic identity, even for those from a single country of origin.
This thesis focuses on the relationship between ethnic composition and both schooling outcomes and classroom behaviour, making the crucial distinction between the share of migrant-origin students and ethnic diversity. Ethnic school composition is seen as one of the explanations for the inequality of school performance between native- and migrant-origin students in Western societies. Although the use of the concept migrant origin is contested concept, the relationship between ethnic school composition and school performance is of interest to policymakers and social scientists in both the United States and Europe.
