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.
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".