Requirement diagram

A requirement diagram is a diagram specially used in SysML in which requirements and the relations between them and their relationship to other model elements are shown as discussed in the following paragraphs.

Demonstration of requirements diagram for a basic lessons learned system.

Derive requirement relationship

If a requirement is derived from another requirement, their relation is named "derive requirement relationship".

Namespace containment

If a requirement is contained in another requirement, their relation is named "namespace containment".

Satisfy relationship

If a requirement is satisfied by a design element, their relation is named "satisfy relationship".

Copy relationship

If a requirement is a copy of another requirement, their relation is named "copy relationship".

Verify relationship

If there exists a relation between a requirement and a test case verifying this requirement, their relation is named "verify relationship".

Test case

A test case is defined by a flow checking whether the system under consideration satisfies a requirement.

Refine relationship

If a requirement is refined by other requirements / model elements, the relation is named "refine relationship".

Trace relationship

If there exists a relation between a requirement and an arbitrary model element traced by this requirement, their relation is named "trace relationship".

References

• Weilkiens, Tim (2008). Systems Engineering with SysML/UML: Modeling, Analysis, Design. Morgan Kaufmann / The OMG Press. ISBN 0-12-374274-9. http://www.system-modeling.com. 

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