This list shows a comprehensive history of all user category discussions on Knowledge (XXG), including CFDs since the closure of Knowledge (XXG):User categories for discussion, RFDs of user category redirects, Requests for undeletion, and deletion reviews. This list was created for the following uses:

• Finding user categories that have been re-created after a consensus has formed to delete (making them eligible for a WP:CSD#G4 deletion)
• Make sorting discussions by topic easier to get a sense of the appropriateness of a particular type of user category
• Make citation of discussions easier by providing links to each discussion

All user category discussions are listed with the exception of discussions resulting in re-listing or closed as being presented in the wrong venue, although the re-listed counterparts to these discussions will be listed. Deletion review discussions resulting in re-listing will also be included. Speedy merging or rename candidates, processed through the speedy section at CfD (and are thus uncontroversial and do not have a discussion linked to it) are also excluded, although the initial merged or renamed category is still WP:CSD#G4-able.

While this list includes a showing of discussion "precedent", it should be noted that consensus can change. Double standards for the same type of categories should be avoided, however. A disagreement with the closure of any of the below discussions needs to be brought to deletion review to be overturned, and should be discussed with the closing admin before bringing it there. Discussions resulting in retaining a category can be renominated freely in good faith, usually after some time has passed to determine if consensus has changed.