Presentation from keynote speaker What is successful interdisciplinary research collaboration, why is it difficult, and how can it be easier?Key-note speaker: Gemma Carr, Coordinator: Vienna Doctoral Programme on Water Resource Systems, and TU Wien Water Risk and Security Research Cluster Presentations from morning session Heterogeneous effects of a Swedish schooling reform: a GxE approach. Rafael Ahlskog, Uppsala UniversityCost-effectiveness for prostate cancer testing: bridging disciplines. Mark Clements, Karolinska InstitutetIntroducing NordInt.net: combining network-science and register data in the study of ethnic integration in Denmark, Finland and Sweden. Carl Nordlund, Linköping UniversityLong-term survival after sleeve gastrectomy versus gastric bypass. Dag Holmberg, Karolinska Institutet