6.4. Use Cases and Functional Requirements
Use cases are requirements; primarily they are functional requirements that indicate what the system will do. In terms of the FURPS+ requirements types, they emphasize the “F” (functional or behavioral), but can also be used for other types, especially when those other types strongly relate to a use case. In the UP—and most modern methods—use cases are the central mechanism that is recommended for their discovery and definition. Use cases define a promise or contract of how a system will behave.
To be clear: Use cases are requirements (although not all requirements). Some think of requirements only as “the system shall do...” function or feature lists. Not so, and a key idea of use cases is to (usually) ...
Get Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
