A new approach of control design of internal model controller is proposed in this book. The proposed design method focuses on modifying the old general structure of IMC and develops a new model structure while saving the same general concept of using the invertible version of the system in the controller design. The new approach combines the IMC structure and the traditional structure of a control problem and this demonstrates an excellent performance and behavior against different disturbance inputs and model uncertainty presented in model parameter mismatch. Beside that a smith predictor is added to promote the design to compensate the delayed time systems. Also a proposed stabilizer has mentioned to deal with unstable systems. The IMC design with delay should help shed some light on this new and exciting method and should be especially useful to professionals in control This book is designed for the professional and academic audience interested primarily in applications of IMC in control engineering and technology.