Although it's a long book, I could read it over and over again. I read the library's book, but ended up buying it on my Nook so I could read it again. I love that it's based on science, not observations alone. Kahneman is a Nobel Prize winner in the field of science. My background (both in education and work) is in science, but his writing is so well done, that I think most people who like the subject would have no trouble understanding it. He gives real life examples that just make so much sense. I have a lot of books about different kinds of "thinking," but this is by far my favorite.