The mission of EuroCC 2 and EuroCC4SEE is to continue the establishment of a network of National Centres of Competence (NCC) in the most efficient way, while continuing to address the differences in the maturity of HPC deployment in Europe, for which improvement has already been noted. Therefore, in addition to high-level management to monitor progress in the NCCs’ development, the main task of the overall activity is to support national centres in setting up their individual operational frameworks, while accessing and making the most of the experience and expertise currently available at national and European level. To support this, EuroCC 2 and EuroCC4SEE work together closely with CASTIEL 2, a Coordination and Support Action that is tailored towards the needs of the NCCs, as well as the Centres of Excellence.