The DeepRain cooperation agreement has been finalized and signed by all project partners. This constitutes the formal basis for a fruitful collaboration among Forschungszentrum Jülich as coordinator, the German Weather Services (DWD), the Universities of Osnabrück and Bonn and Jacobs University in Bremen. “The DeepRain project adopts the principles of Open Science and Open Data. Therefore the collaboration agreement imposes as little constraints as possible, but some rules are necessary.”, says Dr. Martin Schultz, who coordinates the project.