A great interview with one of the great software minds involved in the creation of Mac and Newton. Highlights 1. "your fingers are smarter than you are" ie when designing go with how the software feels 2. "it's really hard to eat your young" sometimes you have to cannibalize your own inventions to move forward (or even to avoid obsolescence) this can take a few forms, from deleting a feature to restarting completely... https://www.youtube.com/watch?v=KsaGx0loR3M