The first public RobMoSys Workshop took place on at the ERF in Edinburgh with more than 50 participants. When the interaction discussions began, the crowd split into small groups to discuss different topics of interest to share experiences and expectations in this workshop. After a warm welcome and introduction of the two new EU Horizon 2020 ICT26c projects, RobMoSys and ROSIN by Anne Bajart from the European Commission, the open call peculiarities of the individual projects were outlined by Christian Schlegel from HS Ulm (RobMoSys) and by Mirko Bordignon from Fraunhofer IPA (ROSIN). Table 1: Better Models, better Tools, better Systems: Building Blocks Supplier Perspective From the perspective of a building block supplier: how to make his building block composable and how to explicate and assure properties? Table 2: Better Models, better Tools, better Systems: System Builder Perspective From the perspective of a system builder who composes systems out of building blocks: How to express and assure relevant system-level properties?