Hi, Consider the following scenario: 1- create class A 2- create class B with a method m that references class A 3- delete class A . As a result B>>#m holds a reference to ObsoleteA 4- create a new class A. B>>#m continues to hold a reference to ObsoleteA. This is even more disturbing, since the source of B>>#m displays A. Is this behavior desired? If yes, in which situations. because I'd rather prefer to have B>>#m updated. This can be done, by moving the association of a removed class (or global in the general case) from the system dictionary to the Undeclared. Side note: just noticed that Undeclared is a dictionary. I was expecting it to be a WeakSet. Noury Ecole des Mines de Douai http://car.mines-douai.fr/noury -- Afin de contribuer au respect de l'environnement, merci de n'imprimer ce courriel qu'en cas de necessite Please consider the environment before you print