I am a beginning spinner, trying to learn how to work the wheel to get the different kinds of yarn I want. Admittedly, much of Amos's book is technical, with mathematical equations that are more daunting than anything else, but there is an astounding array of knowledge, that, while not directly helpful to my goals is fascinating, nonetheless. So far (I'm up to chapter 5) I've learned a few techniques that have helped to craft my spinning into something more advanced than bumbling, but more than that, the book has sparked my further interest into the world of spinning. For example, I don't plan on growing, harvesting and preparing flax for spinnng, but I was fascinated with learning about the process.All in all, a great read.