White Paper One Model

One Model, Many Interests, Many Views

A node on a requirement diagram represents a given element and shows its type, name, and description.

The lines connecting nodes represent relationships with the requirement diagram standardized to

represent the following semantics:

• A circle with a plus sign (or, less frequently, the label <<containment>>) reflecting the

partitioning of a complex requirement without the addition of meaning (e.g., the

decomposition of a compound requirement into its atomic statements);

• <<deriveRqt>> reflecting decomposition into a more detailed requirement where analysis was

used to arrive at the new requirement statement;

• <<satisfy>> reflecting an assertion that the model element (generally an activity or a block)

satisfies the requirement; and

• <<verify>> referencing a test case or other aspect of verification.

Mapping for the Requirement Diagram