The author has an enormous breadth and depth of knowledge but he also writes in a really easily accessible manner - a combination which makes this a wonderful book.
I expected it to be about encouraging readers to use fresh perspectives to problems - and it was that, but it seemed to me it was much more about how sloppy thinking has characterised known problems - i.e. that we need to be much more serious minded about the things that matter.
The author introduces this thought early in the book with the best summary of Simon's 'bounded rationality', which I have ever read, concluding: "[Our human] limits meant that we tended to solve complex problems by breaking them down and focusing on their most digestible parts. By using these intellectual shortcuts, people have a tendency to leave an awful lot of information out of the picture." p.19
The book's conclusion (p.209) echoes this: "...we can look at the complex world around us but miss the deeper issues in play. We are attracted to ... little pockets of certainty which mask larger uncertainties."
I loved this book, it is both thoughtful and easy to read.