The title of the book gives away the main idea behind the book, i.e., ways to separate skill and luck in any outcome. Take any field, be it sports, investing, business , etc. all we get to see is the outcome. In games like chess, the outcome is clearly attributed to player’s “Skill” and in games like slot-machines / casino games, the outcome is clearly attributed to “Luck”. However there are a lot of activities that fall somewhere in between this Luck-Skill continuum.