To achieve best overall plant operation, it is often necessary to coordinate the operation of equipment in multiple process areas. In Chapter 16 of Control Loop Foundation – Batch and Continuous Processes, some examples are given where multi-loop techniques may be effectively used for such coordination. One of the examples from this chapter is power house steam generation. This example also illustrates how PID is used to coordinate the operation of boilers and steam generaton the importance of PID response for recovery from a Process Saturation Condition.