By now I think I have read about fifteen of De Bono's books and this is certainly the best. Many of the others seem to be mostly regurgitations of the the same old stuff. Does he get paid by the word? He claims to have written about 25 books, but I think he has to a great extent written one book over and over again. And he seems so pompous and arrogant. How can someone with such arrogance be creative? He never quotes others (perhaps to him there are no others) or cites other works on creativity, even in cases where his ideas were clearly not first his. This is an excellent book, but by an ego-centric author and that unfortunately colors all his writing.