Welfare policy change has long been studied dominantly from the perspective of domestic politics. Originating mainly from the debates on globalization and Europeanization, ever more scholarly attention has been paid to the relevance of international and transnational factors in the (re)calibration of welfare policies in both mature Western and especially in the developing welfare states. The first generation of analyses on international impacts focused mainly on independent responses on similar external pressures or incentives, the understanding of internationalization thus being merely a functional one. More recently attention has been paid to processes of policy diffusion due to growing density of interaction patterns across countries and the importance of transnational actors. In Europe, the austerity politics after the crisis of 2008 has made the importance of international factors apparent. Yet, the study of international influences on social policy still has major theoretical and methodological shortcomings especially with regard to the applicability for macro-comparative studies. Theoretical approaches on the impact of different mechanisms of internationalization and policy diffusion are fragmented and empirical measures and methods of analysis for capturing diffusion processes in this specific field are underdeveloped. Empirical evidence is either limited to case studies or single social policy programs, or restricted by simplified empirical measures in comparative studies. This workshop therefore invites scholars working on international impacts on welfare policies in order to develop a more coherent framework of analysis and more adequate empirical tools for studying the international impacts on welfare policy change.