Agent-based navel gazing: thesis ch.4

I've been giving copies of thesis chapters to people, but I haven't written about them properly here or got anything published yet. (Or indeed finished the corrections yet...) My unpleasant inner IP-protector is demanding some record I actually wrote it. So, chapter 4 attached: model-navel-gazing a-go-go. Apologies for lack of attached bibliograpy.