K
L
M
Model – an idealized representation of a system in simplified form.
Modeling – the process of representing a system by a formal construct.
N
Negative Feedback – the process of regulating system input by means of system output.
Normative model – a formal representation of a system, usually quantitative, that determines an optimal course of action.
O
Open System – an entity that exchanges materials, energy or information with its environment.
