Great article on Decision Modeling from Gamasutra.com. I'm looking forward to this series as I love tools that allow exploration of the decision space a given game exists within.
"Many design questions are subjective, with no “right” or “wrong” answers. But in some cases – many more than you might think – there undeniably are. And in those cases, we should want to know how to get the right answer, or at least understand how we would go about defining the “right” answer and searching for that solution if it exists."