The ADBU (French national association for academic libraries executives, www.adbu.fr) initiated in 2018 a European comparative study focused on academic libraries and collected data in 13 countries. The ADBU published the first results that are publicly accessible on http://adbu.fr/ladbu-publie-une-etude-sur-lesindicateurs-cles-des-bu-en-europe/: context,purposes, methodology, figures. We are thrilled to present this first step and offer the opportunity to actively join this collaborative collection on a yearly updating basis. We are currently aiming at improving and enlarging the data collection through collaborative working methods, and are willing to promote the co-creation of a shared, open and non-profit comparative tool, accessible and usable to all academic libraries in Europe.