I agree that activity theory helps. So repeating my hunches in different
words, placing them in an activity system, I'd say that the OBJECT of an
activity is what we interact with, while the mediating artifacts we USE
towards that object.
Interactivity is then the play between the process of our activity and the
counterprocess of the object (this word is, again, a loan from Raeithel).
Use, on the other hand could be re-named intra-activity: a within-system pla=
y.
In applying this to concrete situations we must see the flow of things
between positions in the abstract system, and the changing boundaries.
Eva