This document summarizes a lecture on constructivism and international relations theories. It introduces constructivism and compares it to realism and neoliberalism. Constructivism emphasizes the role of ideas and identity in shaping state interests and behavior, rather than just material factors. It holds that identities give rise to interests and norms of appropriate behavior. The document then discusses structural constructivism and the role of norms, before examining identity and status concerns in international politics.