# Talk:Dewey Decimal Classification

The information about DDC number building and synthesized DDC numbers is not obvious nor easy to understand so a more detailed description would help to better understand DDC. -- JakobVoss (talk) 16:02, 25 March 2021 (UTC)

This is summarised under §3 Design.  There needs to be a balance struck between three competing viewpoints: WP:COPYVIO – the tables are (I believe) copyright; WP:NOTHOWTO – the aim is to describe, not instruct and lastly a desire for WP to be as universal as possible.  I might be persuaded to have a go at explaining in more detail if others would indicate where the balance is, alternatively would a librarian would take up the task? Martin of Sheffield (talk) 16:32, 25 March 2021 (UTC)

Hi everyone! I was reviewing reference number 52 in relation to the section on the treatment of Homosexuality and I think the source was misread. It has an accurate Wikipedia:As of tag, but the source itself provides further information regarding a classification change. The OCLC no longer recommends the use of 363.49, directly contradicting the claim made by the post. I'm still new here, so I wanted to post a note before going in to settle on an edit that would work. Whisperwind1242 (talk) 00:23, 5 February 2024 (UTC)

I removed the statement that the Richardson copy was the only one extant. Comaromi is careful not to say that it is the only one and I can find at least 3 copies in HathiTrust - Harvard, UC Berkeley, and University of Michigan. The UC Berkeley one has some notes by J C Rowell, who himself developed a library classification that was used in the Berkeley library. Lamona (talk) 02:39, 2 September 2025 (UTC)