I would like to hear about the larger process: * Evaluating an interfaces usability quantitatively. * The ROI profile for good design. What's the sweet spo

I would like to hear about the larger process: * Evaluating an interfaces usability quantitatively. * The ROI profile for good design. What's the sweet spot, and when do you start yack shaving? * How do 'cool looking', 'compelling' and 'usable' relate to value. * Which of the above fall are squarely in the domain of UI designer? * What does a UI team look like? What skills? How are decisions made? * From a Designers perspective, how should a software product begin its life?