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. A team from IRT SystemX in France used FOOPS! to assess the FAIRness of their semantic artefacts, with the goal of further improving the FAIRness of their data holdings.