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A Ventity™ model simulates the behavior and interactions of a number of entities. Entities range from the real (a person, a rocket) to the abstract (a relationship), and many are a blend of both (a political party, a school).

 

Entities are of different types, and your first job as the modeler is to define the types of entities that will exist in your model:

 

•Your simulation of a construction project might require workers and tasks.

•Your simulation of an ecosystem might require rabbits and wolves.

•Your simulation of a retail bank might require buildings, customers, service representatives, and accounts.  

 

How many of each type there will be at the start, and their individual characteristics, will be set later, in the initialization stage. For now, we focus on describing what types of entities will exist in your simulation, and in writing the equations that will determine their evolution and behavior over time.