This book could be boiled down into a single sentence: don’t make important decisions without considering different scenarios. The book assumes the reader is overconfident and gives a variety of incredibly basic tips for thinking through your options and considering the possibility that your rosy predictions might be wrong. It’s very focused on business and based almost entirely on TED-Talk like anecdotes. They really should have spent a bit of time interrogating whether the problem they describe applies to everyone or actually a very narrow slice of the population. Unless you are an overconfident CEO or investor who has suddenly turned to business self-help books for insight, you can skip this one.