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.

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

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

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

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

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

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

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

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

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