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Environmental effect [SYSMOD] : A factor in the environment that infl uences the system
without communicating directly with it.
Essential activity [SYSMOD] : An essential activity denotes activities that describe the details
of an essential use case step.
Essential requirement [SYSMOD] : A requirement describing the pure domain intention,
regardless of the technical implementation (solution).
Event [UML] : An occurrence, the time and location of which can be measured, that can trigger
behavior in an object. SysML/UML distinguishes between call, change, signal, and time events.
Execution specifi cation [UML] : Specifi es that the object represented by the lifeline
executes behavior at this point.
288 Glossary
Exit behavior [UML] : An optional behavior that is executed immediately prior to exiting
a state.
Exit point [UML] : An exit point stops a state machine. When a transition in any region of
the state machine reaches an exit point, then the state machine is terminated, and the transition
outgoing from the exit point is activated.


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