Outline of the UDC

The following outline is not framed in the actual terms used in the tables of any specific edition of the UDC. It is simply a guide to the arrangement of disciplines and subdisciplines, expressed in the most commonly used terms.

UDC contains over 56 000 Main numbers and over 13 000 Common auxiliaries . See also subject coverage statistics in the UDC MRF 2004 and UDC Summary with approximately 400 divisions.

Main numbers