WebDewey is the easiest way to use the DDC. It includes all content from the Print Edition, including:
- Regular updates (new developments, new built numbers, and additional electronic index terms)
- An easy-to-navigate, simple user interface that is suitable for the novice as well as the power user
- BISAC-to-DDC mappings
Watch a WebDewey demo
This tutorial introduces you to WebDewey 2.0 where you can:
- Access the Dewey Decimal Classification (DDC) and related information
- Search or browse Dewey numbers, Library of Congress Subject Headings (LCSH), Mapped MeSH, and BISAC headings
- Access authority records from links in the WebDewey records
- Add your own notes and display them in context
Microsoft® PowerPoint 97 or higher is required to view the demo. If PowerPoint is not installed on the computer, you may download the free PowerPoint Viewer 2007 directly from Microsoft Office Online
The 23rd print edition, published in mid-2011, includes many new features that make the classification easier to use. The four-volume unabridged edition is published approximately every seven years.
Download highlights from DDC 23 below to help you better understand how the DDC organizes knowledge into a classification that is useful to library users worldwide.
- The DDC 23 Introduction provides a detailed overview of the DDC, including basic terminology and an explanation of DDC structure, complete with many helpful examples. If you are new to classifying with Dewey, this introduction will help you get started quickly.
- Relocations and Discontinuations summarizes Relocations and Discontinuations found in volume 4 of DDC 23. The file includes all relocations and discontinuations since Edition 22.
- The Glossary provides helpful definitions of DDC terms and gives users a common language for implementing the DDC.
- New Features concisely describes what's new in DDC 23, including changes implemented to enhance classifier productivity and a selected list of specific changes to DDC numbers. Look here if you want to quickly assess the changes from DDC 23 that you can apply to your collections.
- DDC 23 Errata is a list of corrections to address significant typographical errors in the print edition of DDC 23. Updates to the content of DDC 23 are available in WebDewey.
Abridged Edition 15 is well-suited for the classification needs of libraries with up to 20,000 titles in their collections. It was published in February 2012.
- The Abridged 15 Introduction provides a detailed overview of the DDC, including basic terminology and an explanation of DDC structure, complete with many helpful examples. If you are new to classifying with Dewey, this introduction will help you get started quickly.
- Relocations, Discontinuations and Reused Numbersincludes all relocations and discontinuations since Abridged 14.
- The Abridged 15 Glossary provides helpful definitions of DDC terms and gives users a common language for implementing the DDC.
200 Religion Class is intended to be used by libraries with in-depth religious collections and small general collections. It includes:
- An updated version of the 200 Religion schedule and the Manual notes for 200 Religion
- An updated and extended index to 200 Religion
- The 170 Ethics schedule
Another exciting feature of 200 Religion Class is an optional arrangement for the Bible and specific religions based on a chronological/regional view. For some time now, we have been exploring the development of an alternative view of 200 Religion to reduce Christian bias in the standard notational sequence for the Bible and specific religions.
In cooperation with Ia C. McIlwaine (University College London, and the former editor in chief of the Universal Decimal Classification [UDC]) we have prepared a chronological/regional view of the Bible and specific religions based on a similar development introduced in the UDC in 2000. The new optional arrangement appears in appendix A of the print version of 200 Religion Class, and in a new Manual note at 220-290 Optional arrangement for the Bible and specific religions in WebDewey.
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Learn more about organizing your materials with the world's most widely used library classification system.
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.
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