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 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".

Demonstration of requirements diagram for a basic lessons learned system.