The book provides valuable insight into the application, theory and practice of PID control technology. These tools of PID control are designed for researchers, students of process control, engineers and industry professionals. The book employs different applications so as to explain various functions such as process modeling, controller design and analysis with the help of conventional and heuristic schemes. It enriches the reader with information regarding important topics such as theoretical information of PID controllers, their design techniques, automated tunings, PID controllers of fractional order nature, and extended practical applications. This book is suited ideally for those seeking design methods and analysis of controllers. Though, it requires the reader to have pre-existing knowledge of transfer functions, regulation concepts, zeroes, poles and background. With advancements in this field, there has been a shift of preference to PDI by interdisciplinary researchers, real time process developers, control engineers, instrument technicians, etc.