Sure if I would have an actual problem I would use strategy to mitigate the problem. With strategy you can extend the single dimensionality of single inheritance but you cannot acquire new behavior. Or better it is even more cumbersome if you use it to make it acquire new things.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.would strategy not solve your problem?