The diagram below shows, how the different SysML artifacts are related to each other at the Requirements Analysis and
Functional Analysis level
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A Use Case Diagram may be associated with many Requirement Diagrams.
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A Use Case Diagram has at least one Use Case.
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A use case should be described by at least 5 Sequence Diagrams.
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A use case should always have one Activity Diagram that captures the functional flow.
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When it comes to building an executable use case model, the use case is translated into a Structure Diagram (BDD,
IBD).
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The structure diagram should have minimum two Blocks (use case block and at least one actor block).
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The behavior of each block is described by a Statechart Diagram.

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