Vision and principles is a good method. This is a great talk about that https://...

Vision and principles is a good method. This is a great talk about that https://vimeo.com/36579366

Covers the inventions at Xerox PARC, how they were motivated by removing modes. Then how Brett Victor of Kill Math http://worrydream.com/KillMath/ fame comes up with his ideas. They all stem from a single unifying principle.

First world problems though and no concern with markets and customer validation.