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NATO Modelling and Simulation - Glossary of Terms Project

The aim of this document is to create a common understanding of M&S terms and where agreement cannot ultimately be reached, to understand variations in definitions. The M&S community is kindly invited to help us improving this living document by using the dedicated feedback form.

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A simulation that is built into, or added into, operational systems to enhance capability.
Australian Defence Simulation Glossary
Modern battlespace systems typically include embedded simulation to aid training outcomes.
  
Any component in a system that requires explicit representation in a model or simulation system.
Australian Defence Simulation Glossary
Examples of entities: platforms (ship, submarine, aircraft), munitions (missile, torpedo), human beings, etc. ; any other components that interact within the simulation.
  
The texture or detail of the natural and human-built domain that is terrain relief, weather, day/night, terrain cultural features; roads, buildings, and the external objects, conditions, and processes that influence the behaviour of a system.
Australian Defence Simulation Glossary
  
A specific change of state of an entity portrayed in a simulation.
MSG-120
A specific event is characterized by the concerned entity and its time stamp.
  
Fair fight is when two or more simulation systems that are part of a distributed simulation environment interoperate in a way that does not lead to a systematic advantage or disadvantage for one of the systems.
”How to ensure fair fight in LVC Simulations” – MSG-087 Siegfried etc
  
An element of the synthetic environment that exists but does not actively participate in interactions.
MSG-120
  
A named component of a distributed simulation system.
MSG-120
In DSEEP a federate is called a “member” of simulation environment.
  
A named set of interacting federates, a common Federation Object Model (FOM) and supporting Runtime Infrastructure (RTI) that are used as a whole to achieve some specific objective.
MSG-120
In DSEEP a federation is called a “simulation environment”.
  
FOM
A High Level Architecture (HLA) specification that defines the information exchanged at runtime to achieve a given set of federation objectives.
MSG-120
  
The degree to which the representation within a model or simulation is similar to a real-world object, feature, or condition in a measurable or perceived manner.
MSG-120
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