To model a system, it is necessary to understand the concept of a system and the system constraints. We define a system as a group of objects that are joined together in some interaction or interdependence toward the accomplishment of some purpose. An example is a production system manufacturing automobiles. The machines, component parts, and workers operate jointly along an assembly line to produce a high-quality vehicle.A system is often affected by changes occurring outside the system. Such changes are said to occur in the system environment. In modelling systems, it is necessary to decide on the boundary between the system and its environment. This decision may depend on the purpose of the study.
I.2.2 Components of a System