Display product requirements, user flows, and design behaviors on each screen.

Our requirements:

There is obvious connections between the flow paths of a use case and its test cases. Deriving functional test cases from a use case through its scenarios (running instances of a use case) is straightforward.

With content based upon an action or event flow structure, a model of well-written use cases also serves as an excellent groundwork and valuable guidelines for the design of test cases

Use cases are not only texts, but also diagrams, if needed.

Analysis involves reaching a richer and more precise understanding of each requirement and representing sets of requirements in multiple, complementary ways.