Common Mobile Group Actions

I've just finished shortening a paper for publication at CTS'05 in St. Louis (anyone else going?) The paper had to be shortened and this was one of the diagrams that didn't make it in.

I've been thinking about how there are broad categories in mobility. Every activity groups do while on the move is different, but there are similar things that people do in different circumstances. Perhaps viewing mobile group behavior from this perspective will show areas that we are concentrating too much on or types of mobile actions we are neglecting. Perhaps common classes of actions have similarities across diverse situations? I'm not so much trying to artificially categorize mobility as to show common areas in the ethnographic research.

Here is my first attempt at a taxonomy of this. Please send me any comments, corrections, thoughts, etc, or post them to the discussion forum.