organization levels

[Alain Grumbach]

Being working on hybrid symbolic - connectionist systems,
I am wondering about the notion of "organization level",
which is underlying hybrid models.

A lot of people use this phrase, from neuroscience, to cognitive
psychology, via computer science, Artificial Intelligence :
(Anderson, Newell, Simon, Hofstadter,Marr, Changeux, etc).

But has anybody heard about a formal description of it ?
(formal but understandable !)

Thank you.

Alain Grumbach
grumbach at inf.enst.fr