The article discusses the principles of designing and operating process control systems. It covers topics such as signals, systems, process hardware, control tasks, data communication, software, and the man-machine interface. The researchers explore how different types of signals are used in process control, the role of hardware and software, and how data is managed and visualized in these systems. Key findings include the importance of stratifying control tasks, the roles of software and hardware, and the significance of the man-machine interface in managing and controlling processes effectively.