The project Decisions and Dilemmas: Learning about the EU from a historical perspective engages a cross-border and mixed group of academics and school educators in the fields of history and citizenship into the collaborative development, testing and implementation of online cross-border educational modules for both history and citizenship at secondary school level. These modules will offer multi-perspective sources and learner-centered activities setting the emergence of post-1945 European cooperation into its historical context. The project will build the capacity of over 50 history and citizenship educators from the EUROCLIO network to teach the history of European integration in a way that is both academically sound and relevant for nowadays’ youth. It will engage a highly motivated and capable group of practitioners into cross-border cooperation and collaborative tool development that will bring them into direct contact with recent research in the field of the history of European integration. The modules will be integrated to a comprehensive body of sources, case studies and learning activities featuring on Historiana (historiana.eu), an online educational portal developed by EUROCLIO to provide access to high-quality resources that are selected, developed and tested in order to promote active learning, critical thinking and multi-perspectivity in history.