It'll never work

I think you misunderstood the sense of model I was using.  I wasn't talking about "model code"
- e.g. a prototype.   I was talking about a theory of what it means for one interface to have
better usability than another.  Instead of Person A saying "I like GUI1 better" and Person B
saying "I like GUI2 better" we should have Engineer E saying "I'm going to use Model 1 to
define and measure the usability of GUI1 and GUI2 in order to quantify which one is better"
and then Engineer F can come along and say, "No we should use Model 2 to do that".