A research data steward from Erasmus University Rotterdam used two different tools, F-UJI and FDMM, to assess and improve the FAIRness of their institutional data repository. FAIRness Assessment Challenge. During the 3-month challenge participants took part in three virtual workshops to self-assess and incrementally improve the FAIRness of their selected outputs. During the support action, participants benefited from interacting with a group of mentors representing the various FAIRness assessment tools and methods.