Most interactive designers of any sort will recognize Fitts' Law, and generally know some very small subset of the lessons of it. How do those apply with touchscreens though? As it turns out, not very well, and in fact this is a case where it didn't fit well into the computer era. Learn about the actual history of how human factors turned into HCI and now usability standards, what we lost along the way, and what guidelines and principles we can derive from this that do apply to modern PC, tablet, and mobile computing today.