Establishing interdisciplinary research networks that bring researchers and innovators together is of utmost importance to all facets of academia. The European Cooperation in Science and Technology Association (COST) does just that. We hear from its Action Chair, María Pilar de Lara-Castells on the COST Action ‘COSY’ which aims to provide computational and experimental building blocks for a fundamental understanding and control of COnfined molecular Systems.Find out more: COST Action CA21101 Explore the growing COSY Action collection: doi.org/10.1039/D3CP90063K