On top of that, i found annoying, that ClassOrganizer sends notifications using SystemNotification. While , IMO best place and only place where notifications should be sent from - is a class. A simple consistency check: | uncategorized | uncategorized := IdentityDictionary new. ClassDescription allSubInstances do: [:behavior | | invalidSels | invalidSels := behavior methodDict keys select: [:selector | (behavior organization categoryOfElement: selector) isNil ]. invalidSels ifNotEmpty: [ uncategorized at: behavior put: invalidSels] ]. uncategorized shows that , there is no uncategorized selectors for all classes in system, i.e. things like: Object organization categoryOfElement: #jjj => nil Then i did a little experiment: added the #blabla method to Object class, and then did Object organization removeElement: #blabla and now the consistency check above shows me that method is still in class, while not present in categorizer. A browser behaves interestingly in this case: - it lists this method only if you selecting '-- all --' metacategory. -- Best regards, Igor Stasenko AKA sig.