This chapter is worth studying during a first read of the book because use cases are a widely used mechanism to discover and record requirements (especially functional); they influence many aspects of a project, including OOA/D. It is worth both knowing about and creating use cases.
Writing use cases—stories of using a system—is an excellent technique to understand and describe requirements. This chapter explores key use case concepts and presents sample use cases for the NextGen application.
The UP defines the Use-Case Model within the Requirements discipline. Essentially, this is the set of all use cases; it is a model of the system's functionality and environment.
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