This thesis applies collective action theory from a historical institutionalist perspective. With applying collective action theory on an international level, the boundaries of collective action...Show moreThis thesis applies collective action theory from a historical institutionalist perspective. With applying collective action theory on an international level, the boundaries of collective action theory are pushed further than before. Collective action theory from a historical perspective is used to investigate the scope of regime complexity intergovernmental organizations experience and the development of state membership of intergovernmental organizations.Show less