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The article introduces constructivist approaches to research on European integration. While stressing middle-range theory, it recognizes that meta-theoretical choices also matter for theorizing and analysing European integration. Tracing developments in the philosophy of science and in international relations theory, social constructivism is introduced as a way of establishing the 'middle ground' in juxtaposition to rationalism and reflectivism - not as a grand theory for the study of European integration. Crucial aspects of the integration process - polity formation through rules and norms, the transformation of identities, the role of ideas and the uses of language - are thereby opened up to systematic inquiry.
Christiansen et al. (Fri,) studied this question.