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Intelligent systems A system is a small part of the universe that we are interested in. It may be natural like the weather or man-made like an automobile; it may be an object like a machine or abstract like a system for electing political leaders. The surroundings are everything else that interacts with the system. The system may sometimes be further subdivided into subsystems that also interact with each other. This division into subsystems is not necessarily unique. In this study, we are mostly interested in mechanical devices that we design for some specific purpose. This by itself helps us define what the system to be considered is.