Universal Decimal Classification
UDC is one of the most widely used classification schemes for all fields of knowledge. It is used in libraries, bibliographic, documentation and information services in over 130 countries around the world and is published in over 40 languages.
Follow us:  
UDC Consortium
The UDCC is a non-profit association of publishers established to maintain, develop and distribute the UDC for the benefit of its users. Apart from its strategic, managerial and promotional responsibilities, the UDCC also appoints an editorial team and advisory board to oversee the content of the scheme and contribute to its regular revision in order to reflect new knowledge.
UDC Books and Schedules
UDCC Online Shop
UDC Summary
 
News
New data in UDC Online English
03/02/2019
UDC Online English has been updated with the new UDC Master Reference File data (MRF12). This includes changes to around 6,000 classes (over 2,000 new classes, 3,000 modifications and over 700 cancellations).
New UDC Master Reference File (MRF12) Released
09/01/2019
UDC MRF12 was released at the end of December 2018. It contains changes published in two double-issues of the Extensions & Corrections to the UDC: 34-35 and 36-37. The new UDC MRF now consists of around 72,000 classes and it brings changes to over 6,000 classes.
Events
April
11
9th Annual ISKO Italy Meeting (9' Incontro ISKO Italia) - in Biblioteca nazionale centrale di Firenze
Florence (Italy)
June
20
First ISKO-Low Countries Conference - "Morsels of Knowledge" (Conference and Inaugural Meeting)
Brussels (Belgium)
July
15
ISKO UK Biennial Conference - Creativity, ethics and AI in knowledge organization: The Human Position in an Artificial World
London (UK)
August
24
IFLA World Library and Information Congress - 85th IFLA General Conference and Assembly
Athens (Greece)
All News
All Events