About Universal Decimal Classification

Universal Decimal Classification (UDC) is the world’s foremost classification scheme for all fields of knowledge, used for sophisticated indexing and retrieval.

Since first published over 100 years ago, UDC has developed into a highly flexible and effective system for organizing bibliographic records for all kinds of information in any medium, and is used internationally by:

  • libraries
  • museums archives
  • bibliographies
  • bibliographic databases
  • information services
  • internet.

Click here for current UDC standards and publications.

Free two week trial of UDC Online
For the trial please contact our UDC Customer Services department on +44 345 086 9001, email at udc@bsi-global.com.

Click here for further information on the structure and use of UDC.

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