On Sun, 2 Mar 2003, Marco Paga wrote:

> and tell him about a message they recieved that is about to change their
> state. Perhaps it could be done with AspectS and implemented as an
> aspect (There is a way in java to do this). Or is there a way in "clean"
> squeaky smalltalk?

This was exactly what I was getting at with some kind of
AboutToChangeNotification.  Of course we could wrap it in a method on
object so that this looked like

self changing: [
  ... do something that changes state...
]