2022 marked the fourth anniversary of the CESSDA Resource Directory (RD). Since 2018, the RD team members have gained experience and knowledge about the service and curation process and the RD has grown both in quantity and in quality. This deliverable thus answers a need to formalise the RD’s collection development policy and the curation process created and followed by the RD editors. It also suggests different developments for the RD and proposes a maintenance strategy to foster its sustainability.