One Model

One Model, Many Interests, Many Views

Mapping for the Requirement Diagram

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 <>) reflecting the partitioning of a complex requirement without the addition of meaning (e.g., the decomposition of a compound requirement into its atomic statements); • <> reflecting decomposition into a more detailed requirement where analysis was used to arrive at the new requirement statement; • <> reflecting an assertion that the model element (generally an activity or a block) satisfies the requirement; and • <> referencing a test case or other aspect of verification.

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