UDC Consortium

The Universal Decimal Classification (UDC) is a knowledge classification scheme used to organize and retrieve information across a broad range of subjects. It is used by libraries, bibliographic services, documentation centres, and information services in more than 130 countries, and is published in over 40 languages. The UDC Consortium (UDCC) is a non-profit association of publishers responsible for maintaining, developing, and distributing the scheme for its users. It oversees regular revisions so the classification can reflect new knowledge, supported by an appointed editorial team and advisory board.

The UDCC provides access to UDC editions and publications, including the UDC Summary, through its online shop and digital services. Its offerings also include UDC Online, licensing, data services, consultancy, and training. The organization shares resources about the classification’s history, structure, notation, subject coverage, and use, as well as updates, extensions, and corrections. It also supports a community through news, events, seminars, discussion forums, and publications, helping information professionals and other users apply and understand UDC.