Updates: Status: Accepted Comment #3 on issue 3957 by marianopeck: MethodWrappers left method after uninstall http://code.google.com/p/pharo/issues/detail?id=3957 "I think that's ok to follow the lookup, because the inherited selectors are part of the behavior of the class, but i think it's a good idea to have a form to restrict that." yes, because the user can do a mess with that. The easiest way is to trhow an error. Then the user can always do the method lookup by himself and do a installOn: with the correct class and selector. "Anyway, in any of the two cases, after the uninstall process, the class should be clean" I agree. I will try to provide a solution (taking int account yours). I will let you know. Daniel...BTW, which is your particular use for MethodWrappers? I mean, why are you using them for? I am just curious...