As a bonus, I finally learned how to pronounce this author's name. As a practical use of 8 minutes this is hard to beat - a great video with fascinating visuals and an easy to understand summary of a book that's not an easy read. I'm sharing it so of course I can remember to watch it again later. It's also time to read the book again. Here's the video: Four Important Factors: Focus Freedom Feedback Four % Challenge It's well worth checking out the other quality material available at The Productivity Game .