A true practical guide, this book brings together all elements necessary for the practice of PID control in industries. The first part presents the different characteristics of the PID controller: continuous, digital, architectures, realization algorithms implementation. The second part describes different adjustment methods that are practiced in the industry, all illustrated with numerous response curves to show their specificities. We will also find elements concerning simple methods, often graphic, to identify the usual processes to be controlled, without identification software. The book is intended to be practical with many summary tables, for immediate use of knowledge with as few calculations as possible. This book is aimed at students wishing to learn the practice of PID control, as well as teachers, engineers and technicians of the profession.