you might be right. The way talents work is basically what I am asking for. I never got into depth with talents and thought it is much more than adjustment of behavior on per object base. I was hoping there are some easy things available to use in order to modify behavior lookup. I should have a look at talents. Thanks for the tip.Hi Norbert,It sounds like you want something like talents Talents http://scg.unibe.ch/research/bifrost/talents.However, there is no running version on pharo 3.0 yet.I am not aware of work on object-specific traits, I could be wrong though.