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A parallel state is one whose substates are performed concurrently. As such, no transitions are allowed between the substates of a parallel state.

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24. States: State Decomposition-2.sysml
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OMG Systems Modeling Language TM (SysML®) Version 2.0 formal/2025-09-03 (Sep 2025)
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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A parallel state is one whose substates are performed concurrently. As such, no transitions are allowed between the substates of a parallel state.
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In contrast, if a non-parallel state has substates then, exactly one of the substates shall be active at any point in time in the lifetime of the containing state after completion of the entry action (if any).
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