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Simulation

Is the imitation of the operation of a real-world process or system over time.

System

is a set of elements that interrelate to function as a whole; (from a simulation point of view, the elements must have a clear boundary)

Entity

Attribute

It’s an object of interest in the system.

It’s an entity property.

Activity

It represents a specific time period. It is a property of an entity.

State of a System

It is defined as the collection of variables needed to describe the system at any time, in relation to the objectives of the study.

Event

It is defined as an instantaneous occurrence that can change the state of the System.