Dewey Updating Procedures
Updates to Dewey can be found on the Dewey web site at http://www.oclc.org/us/en/dewey/updates/ddc23/default.htm. There is also a link on each page in WebDewey to this Updates page. It is intended that PDFs of any major changes will be posted once a week on that page. Note that the updates will appear on a weekly basis even though changes can appear in WebDewey itself as frequently as daily. The PDFs contain replacement or additional records without further explanation. Individual changes to class records are not indicated.
An errata to the print edition of DDC 23 was published in July. It is available at http://www.oclc.org/us/en/dewey/versions/print/default.htm.
A review of the old PPT mappings and upgrading them to LCSH mappings in WebDewey is currently under way. This project has started with the 500s. Class 500 itself only had 2 LCSH mapped to it at the beginning of November—now there are 7 mapped to LCSH.
A major WebDewey upgrade was implemented on 6 November 2011. Among the enhancements are changes to the opening screen and user preferences, new icons for built numbers and Manual notes, and access to the history of numbers. The last will be available in a new History box on the results screen. If you click on the arrow in the right-hand corner of the History box, any history notes associated with the class will be displayed. WebDewey will also include the changes to South Sudan just approved by EPC.
More information about Dewey can be found on the OCLC website