Open
System/Close System
A system with
exogenous activities is considered as open system and a system with strict
endogenous activities is called a closed system.
System
Environment
The external
components which interact with the system and produce necessary changes are
said to constitute the system environment. In modeling 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.
Example: In a
factory system, the factors controlling arrival of orders may be considered to
be outside the factory but yet a part of the system environment. When, we
consider the demand and supply of goods, there is certainly a relationship
between the factory output and arrival of orders. This relationship is
considered as an activity of the system.
Endogenous
System
The term
endogenous is used to describe activities and events occurring within a system.
Example: Drawing
cash in a bank.
Exogenous System
The term exogenous
is used to describe activities and events in the environment that affect the
system. Example: Arrival of customers.
Discrete System
Discrete system is one in which the state variables changes only at a
discrete set of time. For example: banking system in which no of customers
(state variable) changes only when a customer arrives or service provided to
customer i.e customer depart form system.
Continuous System
Continuous system is one in which the state variables change continuously
over time. For example, during winter seasons level of which water decreases
gradually and during rainy season level of water increase gradually. The change
in water level is continuous. The figure below shows the change of water level
over time.
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