Hi, at Synectique, we are using cache for lots of projects and for now we were always using another instance variable or a dictionary to store many. It is complicated to maintain and we are always reinventing the wheel. That's why i created a first implementation (very naive but functional, documented and tested) of a cache. It is available here (with usage explication): http://smalltalkhub.com/#!/~GuillaumeLarcheveque/SmallCache and you can get it by doing: Metacello new smalltalkhubUser: 'GuillaumeLarcheveque' project: 'SmallCache'; configuration: 'SmallCache'; version: #development; load Tell me if you are interested in it or if you have ideas about it. -- *Guillaume Larcheveque*