Board Thread:Support Requests - Community Management/@comment-23932365-20141129182929/@comment-5558012-20141130151011

452 wrote:
 * There is a problem that when an images is added to only one article, and not all relevant articles, there are occasionally similar duplicates. But I do not see how categories could fix this, as the same problem occurs in both of these situations:
 * UserA uploads File:Bob doing stuff in MissionX.jpg and adds it to Bob#Gallery or Category:Bob
 * UserB uploads File:MissionX - Bob doing stuff.jpg and adds it to MissionX#Gallery or Category:MissionX

Maybe it your case. Our category structure prevents overlap in this way by excluding categories that could be used in an either/or fashion. The vast majority of images have one and only one category they can be applied to. Some images include two categories when noted on their category pages.