As project manager of the Art Discovery Group Catalogue project, and on behalf of the artlibraries.net committee, Geert-Jan Koot explains the development of the Art Discovery Group Catalogue. This discovery service powered by WorldCat is a new, separate project developed by the Online Computer Library Center (OCLC) in Europe for art libraries, which became officially available on May 1st 2014. The project has been accepted within the international Future of Art Bibliography (FAB) initiative of the Getty Research Institute as its bibliographic component. The fact that the system is being developed in Europe provides an excellent equilibrium between Europe and America within the project. Following the invitation to participate, over 80 libraries have so far expressed interest, of which 60 have joined the catalogue. This project is a major step in one of the FAB goals of making art bibliographical information available worldwide through collaboration.