9.1. What Are Use Cases?
When determining what the desired functionality of a system is to be, we must seek answers to the following questions:
Who will want to use the system?
What capabilities will the system need to provide to be of value to them?
When users interact with the system for a particular purpose, what is their expectation as to the desired outcome?
Use cases are a natural way to express the answers to these questions. Each use case is a simple statement, narrative or graphical in fashion, that describes a particular goal or outcome of the system, and by whom that outcome is expected. For example, a goal of the Student Registration System (SRS) could be to "enable a student user to register for a course" or to "allow a professor ...
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