Further my post at Nov 9, 2013 6:24 PM (http://mathforum.org/kb/message.jspa?messageID=9320075), find that I had attached the wrong document to that post; I believe there was no model in that document - please instead see the model herewith attached titled "DECISION!! Math or Computer Science???". (Here I have just now added some notes on Joe Niederberger's post that came later, though I've not added his elements to the model).
Please read the preliminary notes before you try to read the model. However, do keep in mind that the model you would construct for yourself would be very different from the one I have constructed - the idea is to create an effective representation of YOUR OWN mental model on the issue.
I also emphasize that this model is highly dynamic in nature. For example, if I were to reconstruct the model now, it would probably be quite different in several aspects from the one illustrated at the attachment - this is an indication that I've learned something from the exercise.
If you decide to use this process, you will need to understand just how such models become effective Action Planning as you develop them. (As noted, it would take a couple of months of a little learning - along with a fair bit of 'unlearning' to learn how to use the process effectively).