Use Case Model

Chapter 6
USE-CASE MODEL: WRITING
REQUIREMENTS IN CONTEXT
The indispensable first step to getting the things
you want out of life: decide what you want.
Ben Stein
Objectives
Identify and write use cases.
Relate use cases to user goals and elementary business processes.
Use the brief, casual, and fully dressed formats, in an essential style.
Relate use case work to iterative development.
Introduction
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 con-
cepts 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 function-
ality and environment.
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