Control theory for physicists This book extends a tutorial I wrote on control theory (Bechhoefer 2005). In both the article and this book my goal has been to make the strange familiar and the familiar strange. 1 The strange is control theory feedback and feedforward transfer functions and minimum phase H8 metrics and Z transforms and many other ideas that are not usually part of the education of a physicist. The familiar includes notions such as causality measurement robustness and entropy concepts physicists think they know that acquire new meanings in the light of control theory. I hope that this book accomplishes both tasks