The aim of this book is to educate the readers regarding the various design aspects of PID controllers. The design of PID controllers were first introduced in the market in 1939 and is still considered as a challenging field that needs novel approaches for the formulation of solutions for PID tuning complications while capturing the effects of noise and process variations. The intensified complexity of novel applications in fields like microsystems technology, dc motors, automotive applications, industry procedures, pneumatic mechanisms, needs controllers that embody significant characteristics of the systems into their design like system's nonlinearities, disturbance rejection needs, model uncertainties, time delays and performance criteria among others. This book aims to present distinct PID controller designs for several contemporary technology applications in order to satisfy the requirements of a wide audience of researchers, professionals and scholars interested in studying about the progresses in PID controllers and associated topics.