As shifts in great power politics amplify debates on European defence integration, STRAX offers a novel take on analysing change in strategic cultures that shape security policies. Focussing on the impact of transnational epistemic communities, the project examines the reasons, drivers and venues for change – breaking down national silos and analysing interaction. STRAX looks at different European countries as well as forms and venues of practical cooperation, such as crisis management operations, strategy processes in the EU, and curriculum development in military education. On the level of theory-building, STRAX examines what strategic cultures can consist of and how they overlap and change. On the level of policy analysis, it develops a critical understanding of the actors and processes of change in contemporary Europe. It also contributes to the production of policy-relevant knowledge on change for policy-makers, as well as to pedagogical evolution in strategy-related education.