Abstract and Objectives Over the past two decades, the European Union has experienced parallel and often conflicting dynamics of Europeanization and De-Europeanization, shaping both institutional development and key areas of public policy. The financial crisis, the COVID-19 pandemic, Brexit, the rise of populism, the war in Ukraine, as well as the growing tensions surrounding the Schengen area and internal border controls, have revealed increasing pressures between integration, national retrenchment, and policy fragmentation. This Working Group aims to provide an academic forum to advance conceptual and empirical debates on these processes. In particular, de-Europeanization is understood as a reversal, contestation, or re-nationalization of previously Europeanized policies (Copeland, 2016; Müller, Pomorska & Tonra, 2021). The WG will focus on the following objectives: To analyze Europeanization as a mechanism of domestic change induced by the EU (Radaelli, 2000, 2003). To examine dynamics of de-Europeanization and the partial reversibility of European integration (Copeland, 2016; Müller et al., 2021). To assess the role of crises as catalysts for institutional adaptation or the re-nationalization of public policies. To explore processes of erosion, contestation, and reconfiguration in common EU policies and governance regimes such as Schengen, migration, internal security, or economic governance. To identify the role of national, European, and transnational actors in compliance, resistance, and policy transformation. The Working Group explicitly welcomes theoretical contributions, comparative perspectives, and case-study-based research, as well as innovative empirical approaches exploring how and why EU policies are consolidated, eroded, or reconfigured over time. Particular attention will be paid to the temporal evolution of these policies in terms of Europeanization, contestation, and possible trajectories of de-Europeanization. Possible Paper Topics The WG particularly welcomes proposals addressing (but not limited to): The governance of Schengen and the reintroduction of internal border controls. Crisis-driven policy change, differentiated integration, and re-nationalization dynamics. Compliance, resistance, and institutional innovation across Member States. Conceptual and methodological tools for studying Europeanization and de-Europeanization. The role of political parties, courts, administrations, and societal actors in shaping EU policy trajectories. Inclusiveness and Language Statement The WG particularly encourages submissions from early-career researchers and interdisciplinary perspectives, fostering dialogue across political science, public policy, international relations and European studies. While the Working Group will primarily operate in English in order to facilitate broader international participation, paper proposals and presentations in Spanish are also welcome. Coordinator Esteban Arribas Reyes Universidad Complutense de Madrid Faculty of Political Science and Sociology estearri@ucm.es Discussant Rut Bermejo Casado Associate Professor (Profesora Titular), Universidad Rey Juan Carlos rut.bermejo@urjc.es Selected References Börzel, T. A., & Risse, T. (2018). From the euro to the Schengen crises. Journal of European Public Policy. Copeland, P. (2016). Europeanization and de-Europeanization in UK employment policy. Public Administration. Hooghe, L., & Marks, G. (2001). Multi-Level Governance and European Integration. Müller, P., Pomorska, K., & Tonra, B. (2021). From Europeanisation to de-Europeanisation? Journal of European Integration. Radaelli, C. M. (2000). Whither Europeanization? European Integration Online Papers. Radaelli, C. M. (2003). The Europeanization of public policy. In The Politics of Europeanization. Schimmelfennig, F. (2021). Crises and the dynamics of European integration. In Oxford Handbook of the EU. Stubb, A. (1996). A categorization of differentiated integration. Journal of Common Market Studies.