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computation comparison table
Subject cause by complete before have example has definition be occur instantaneously
action^2one of the following situations: as sending a message, starting a hardware device or setting a variableSomething that takes place effectively instantaneously when a transition occurs in a state diagram, or upon entry or exit from a statesimple because it should take place with no noticeable consumption of time  
activity the system leaves the current state as the result of some transition Something that occurs over a period of time and takes place while the system is in a state   

Next eventexternal event    Upevent    Previous eventamount of elapsed time