I was fortunate enough to visit Jef Raskin while the Cat under development. In his office was a fold-out futon chair and electronic piano. He even played a piec

I was fortunate enough to visit Jef Raskin while the Cat under development. In his office was a fold-out futon chair and electronic piano. He even played a piece. Humane indeed! He recommended "The Psychology of Human-Computer Interaction" (Card, Moran, et al) From that point forward, all roads led from Fitt's Law.