说明：  In Part I we have focused on process modelling and dynamics analysis. In this part, we will extend our discussion to include the whole control system. A control system consists of several elements. Each element can be modelled and analysed by using the techniques explained in Part I. These individual elements are connected together to form a control system. A new model, the closed-loop transfer function is to be introduced to describe the whole control system. Based on the closed-loop transfer function, various control system design methods are to be introduced.