Melvil Dewey was one of the most influential librarians of his day and is still one of the most recognized names in librarianship.
- Read more about his life and his contributions.
- Review a timeline of milestones in the development of the Dewey Decimal Classification® (DDC®) system.
Resources for teachers and students
Resources for librarians
- Dewey updates
- Dewey Decimal Classification News (the DDC newsletter)
- Dewey news, events and recorded presentations
- Dewey translations
- The Dewey blog
- Mapping new LCSH with DDC numbers
- The Dewey Cutter Program
- Dewey Summaries
Additional Dewey resources
- Editorial Policy Committee
- Discussion papers
- Dewey Religion Browser
- Cookbook Finder
Since the DDC system was created more than 135 years ago, it's easy to assume that the Dewey name is in the public domain. However, it never has been, and since 1988, OCLC Online Computer Library Center has held the trademark on the Dewey name.
If you have interest in licensing the Dewey name for a legitimate business purpose, please contact OCLC first. We have established licensing arrangements that enable other organizations to use the Dewey name while protecting OCLC's trademark rights.
"The DDC is a quick way to give our patrons a place to start to browse on the shelves and uncover resources not detected through a simple catalog search."
Oaklyn Branch Library
Evansville Vanderburgh Public Library
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.
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.
Watch this space for Dewey Services news.
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.