Off topic here, but CAST is one of my favourite topics. CAST is one reason why I think co-existing dumb AIs are a bigger risk than the singularity. CAST is also how I look at information flows around parts of a complex system - there are particular patterns that helps you segment the system and thus understand it more easily. For example, thinking about a database diagram as a CAST meant it was easy to quickly derive rules for where to look for the conceptual objects first time I looked at a diagram and then point out where problems might occur.
It's an extremely helpful conceptual tool. Equilibriums, dampening effects, amplifying effects - all good stuff.