Dewey® Services

Stay current with ongoing updates to the DDC®

The Dewey Decimal Classification® (DDC) system is updated on an ongoing basis. Check the list of DDC updates regularly to keep your collections organized and current. Or, browse the archive of new and changed entries.

You may also be interested in the archive of LCSH/DDC numbers of interest, which suggest how classifiers can treat materials in topics that were introduced after the current print edition of the DDC was published.

All libraries face myriad challenges in classifying their library materials. The Dewey editors seek the advice of Dewey users on ways to improve treatment of specific subject areas in occasional discussion papers with instructions for returning comments. Subscribe to 025.431: The Dewey blog for ongoing advice on the use of the DDC.

Your subscription to WebDewey® services or Abridged WebDewey includes regular updates that keep your cataloging and classification efforts aligned with the latest updates to the DDC. Both services contain the latest versions of the schedules, tables and Manual and Relative Index entries (print and electronic) from the respective enhanced DDC databases. The hierarchical displays in WebDewey and Abridged WebDewey feature updated main class and division captions (e.g., 700 Arts & recreation; 790 Sports, games & entertainment).

Using WebDewey, you can have ongoing access to all updates to the DDC and to the complete list of LCSH/DDC postings. 

The Dewey Decimal Classification® (DDC®) system is the world’s most widely used way to organize library collections. The DDC constantly updates to enable better discovery across any topic in multiple languages. Because the DDC is easy to use, you can increase the visibility of your materials quickly and efficiently.

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Download the Dewey Services brochure

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The Dewey blog is a great source for news and views on classification issues as well as interesting and unusual DDC resources and curiosities. It's also a convenient way to share feedback directly to the DDC editors to help shape the future of the DDC.

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.