Ivan Tomek wrote:

>Doesn't a stack-based  model like Collage presume a sequential form of
>development? The earlier discussion dealt with parallel and
>independent developments. How would the Collage model deal with
>this?
>
>Ivan
>
The stack-based model tries to mimic the sequential form, without 
making independent development difficult. One idea of Collage is that 
the stack can be reorganized at any time, making the system behave as 
if the different layers were filed in in another order.
I think that the main problem with non-intersecting application 
approaches such as ENVY is that they make 'patches' quite difficult 
to develop and maintain if you're not the owner of the application to 
be patched. In the highly delocalized culture of Squeak, where people 
from all corners contribute interesting things (which are often not 
in a production-quality state), this is simply unfeasible.

Hans-Martin