Scholarly interest in the mobilization of law and legal norms by citizens and collective actors and the impact of this activity on politics and social change has long featured in studies of American politics. In Europe however, research on legal activity was long the exclusive remit of legal scholars and the subject was only of peripheral interest to political scientists. However, with the growth of regulatory models of governance, increasing processes of legalization at both the state and supranational level, the rising influence of judicial institutions, EU enlargement, enhanced levels of access to justice and the growing prominence of rights talk among citizens, corporate firms and social movements, legal mobilization research is moving to centre stage among scholars who study political processes in European national and supranational settings. In order to develop a better theoretical understanding of the mechanisms at play, the goal of this workshop is two-fold: 1) to empirically explore cross-national and cross-policy field variation in levels of legal mobilization activity, rates of success and resulting judicial and policy decisions beyond a single setting, and 2) to contribute to developing a synthetic theoretical framework that accounts for both structural and contingent features that encourage or constrain litigation activity and success. The multiplicity of legal systems and institutions, on the national and EU level, form a unique socio-legal institutional context and offer many research puzzles. This workshop will take stock of existing research, debate theoretical and methodological approaches to the study of legal mobilization and move the empirical research agenda forward. Empirically-oriented comparative studies, which engage and challenge existing theoretical foundations are particularly welcomed. The overall aim of all papers should be to attempt to account for variation in legal mobilization activity and judicial policy-making across policy-fields or across countries. The goal is to identify and analyze patterns of legal mobilization and resulting judicial and policy decisions beyond a single setting in order to develop a better theoretical understanding of the mechanisms at play. The workshop welcomes qualitative as well as quantitative studies and is open to research from various epistemological points of view.