Between 3−4 stars rating, 23 September 2020This book is not about steps or ways to think clearly. This book contains ninety-nine different ways of thinking unclearly. Each type is given a brief description, brief case examples, and a summary of the related research results. All in 3-4 pages per kind of way of thinking. These examples of unclear thinking make it easier to interpret clear thinking, that is, by avoiding unclear thinking. Although brief, the message conveyed by Rolf Dobelli can be caught clearly. Because it is concise, this book is easy to read little by little, to fill the gap. It seems that this book is not suitable to be read at once finished in a few hours, because it will feel boring and lack the meaning. There are some thoughts of Rolf Dobelli that I disagree with, however, most of the contents of this book can be understood with logic and are worthy of consideration for application.