On Tue, 10 Jan 2006, stéphane ducasse wrote:
[snip]
> how this is possible that we do not invent
> a way to deal with all these versions alltogether leaving happily in the same 
> "image". I trying to understand why we have the evolution problems. The 
> language seems not to take into account evolution and changes. But I do not 
> have concrete and reasonable solution.

This is not a solution, but I've always been fond of this discussion:

 	http://minnow.cc.gatech.edu/squeak/745

The Collage metaphor is appealing to me. I like the idea of having 
different version of my image coexisting as different layers, and being 
able to load thing into the "right" layer (i.e, the layer they were 
defined for).

Cheers,
Bijan.