The CARIOQA-PHA team held its first workshop at the CNES in Toulouse at the end of March. This workshop defined the mission’s objectives and the main specifications, discussed the various orbit concepts envisaged for CARIOQA Quantum Pathfinder mission and identified the types of platform that could meet the specifications. Based on this workshop, detailed analyses will be carried out in order to identify the possible system and operations concepts for CARIOQA. This workshop was also an opportunity to bring together teams from different partners and establish links between them.