7.4.4 .4 Relate and Verify Requirements Relationships Requirements may be related to each other in several ways when defining the requirements architecture. Business analysts examine and analyze the requirements to define the relationships between them. The representation of these relationships is provided by tracing requirements (see Trace Requirements (p. 79)). Business analysts examine each relationship to ensure that the relationships satisfy the following quality criteria: • Defined: there is a relationship and the type of the relationship is described. • Necessary: the relationship is necessary for understanding the requirements holistically. • Correct: the elements do have the relationship described. • Unambiguous: there are no relationships that link elements in two different and conflicting ways. • Consistent: relationships are described in the same way, using the same set of standard descriptions as defined in the viewpoints.

A. Defined. According to BABoK the criteria to assess requirements relationship is: Correct, Consistent, Unambiguous, Defined and Necessary. Complete is not a criterion for requirements relationships but rather to assess the quality of requirements/ designs themselves.