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An interaction represents an event in time that has no continuing state, e.g. a change in an ATC clearance or the firing of a weapon
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An interaction, unlike an object does not persist; it occurs at a specified time
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Federations subscribe to classes of interactions. They are then notified when another federate sends an interaction of that class
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Each interaction class specifies the set of parameters for each instance of that class
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Like object classes, one interaction class can inherit from another
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An interaction is instantiated by messages which are essentially sent and received by methods of objects
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