This is like the bible of the permaculture movement (or whatever you want to call permaculture) by one of the men who invented the term. It is not exactly light reading at nearly 600 pages. But, it is quite readable if such things interest you. The reader should have some basic knowledge of biology, chemistry and other physical sciences. I suspect that most people who call themselves permaculturalists have never read the thing. Sad, because it is a very thorough and complete treatment of what is really a pretty broad subject - from the ethical to the theoretical aspects to design techniques to practical examples of permaculture in practice from all over the world. Good luck finding it at the list price. Amazon wants hundreds of dollars for it, as does the publisher. The publisher describes it as a textbook for Permaculture design courses. It would be great for that, but I haven't seen it used that way.