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Dewey® Services

Dewey Decimal Classification for use with OCLC's online cataloging services®

The Dewey Decimal Classification (DDC) system is the world’s most widely used library classification system. The 23rd edition of the DDC enhances the efficiency and accuracy of your classification work in ways no previous editions have done.

You can use the DDC in several convenient formats. The four-volume print edition includes thousands of updates added to the system over the past seven years. The electronic version, WebDewey, enhances the print updates with online delivery that is updated continuously. Abridged Edition 15 is a simplified version perfect for smaller collections. Whether you choose the print or electronic format (or both), DDC 23 makes it easier than ever to organise your library collections.

The DDC evolves continually to keep up with recorded knowledge. You can find news about DDC developments in several ways, including a semiannual DDC newsletter, DDC conferences and workshops, OCLC Newsletter articles and case studies.

All copyright rights in the Dewey Decimal Classification system are owned by OCLC.
Dewey, Dewey Decimal Classification, DDC, OCLC and WebDewey are registered trademarks of OCLC.

We are a worldwide library cooperative, owned, governed and sustained by members since 1967. Our public purpose is a statement of commitment to each other—that we will work together to improve access to the information held in libraries around the globe, and find ways to reduce costs for libraries through collaboration.