I am developing a theory of interaction (!). In the process of doing that, I am trying to categorize my theory. To do that I need to know what are the (common) categories of theories in HCI. So, this is where I need some help. I have decided that the categories should be based on what the theory is about, that is, defined by its object of study. As a first draft, it is possible to distinguish three kinds of theories with three distinct objects of study.
The first category are theories that has human computer interaction as the object of study, that is, theories that say something about the interaction between humans and interactive artifacts.
The second kind of theories are those that have the design process as a core object of study. Based on intuitive statistics (!) I think this is where we find the major part of theories in the field.
The third kind are theories that address how interaction and interactive technology changes society and environments, that is, theories that have the relation technology--society as the object of study.
So, what else? Any ideas?