Six Thinking Hats: Popular PenguinsEdward de Bono's Six Thinking Hats is the groundbreaking psychology manual that has inspired organisations and individuals all over the world. De Bono's innovative guide divides the process of thinking into six parts, symbolized by the six hats, and shows how the hats can dramatically transform the effectiveness of meetings and discussions. This is a book to open your mind, unleash your creativity and change the way you think about thinking.