Examine the SetTime and SetAlarmTime use cases you wrote in Exercises 4–2 and 4–3 Eliminate any redundancy by using an include relationship. Justify why an include relationship is preferable to an extend relationship in this case.
What will be an ideal response?
The solution to this exercise should include three use cases: SetTime, SetAlarmTime, and a third use case (which we
called SpecifyTime) made out of the common parts of SetTime and SetAlarmTime. The essential point is to factor out
as much common functionality as possible into the third use case. The rationale is that, by eliminating redundancy,
fewer inconsistencies are introduced in the future when the use cases are modified. Below is a sample solution for this
exercise.
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