Hi, An object A have a collection of objects B. each objects B have a collection of objects C, and finnaly each object C have an attribute wich references an object B take in the collection of A. A 1<=>* B 1<=>* C 1<=>1 B among the Collection of A My problem : In a description can I acces to the object which is currently describe? I use a class variable style 'myCurrentObject' which I feel before compute the descritption but it smells bad... :-/ I hope that I've been understandable ;-) Florent. :-)