Role qualifier is a controlled vocabulary that serves as a subset or refinement of the Role controlled vocabulary. Initially, it provided the quality of the interveners at the Court of Justice. Role qualifier can be used as a pick list to refine the various roles of persons more precisely. The range of users includes Court of Justice, Whoiswho and Directorate-General for Communication of the Commission. Labels are provided in all 24 EU languages. It is maintained by the Publications Office of the European Union and disseminated on the EU Vocabularies website.