A System is an interactive or dependent group of elements that form a unified whole. Each system is bounded by its spatial and temporal boundaries surrounded and influenced by its environment described by its structure and purpose and expressed in its function. System theory sees the world as a complex system of interconnected parts choose a system at the border that is to choose which devices are present within the system and which are included in the environment. A simplified representation of the system can be done to understand and predict or influence their future behavior these models can define the structure and behavior of the system. A System where there are natural and artificial systems natural systems may not have an obvious goal but their behavior can be interpreted by who as an observer of an observer. Systems made by man to meet a need identified and declared for purposes achieved by delivering desired products must be related must be designed to act as a coherent device otherwise they would be two or more different systems.
The system has input and output flows that represent the exchange of matter, energy or information with the environment. An open system replaces matter and energy with its environment. Most systems are open systems such as a car, coffee maker or computer. A closed system switches energy but it does not matter to the environment or the isolated system in the project does not exchange matter or energy with the environment a theoretical example of such a system is the universe an open system can also be seen as a limited transformation process that is a black box that is a process or assembly process that converts inputs to output inputs consumed.
The term entry and exit here is very wide includes several views artificial systems can have such views as a concept analysis design, implementation structure, behavior input data, and output data. A system model is required to describe and represent all these multiple views a system architecture that uses a single integrated model for multi-view description such as concept design of implementation design implementation structure, behavioral behavior coalescence data entry and output data display is a type of System model.