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a.
Use-case
Use-case represents one function or action being
perpetrated towards the system. Use-case is often
made in the early stages of development and later
will be revised in accordance with the development
progress. Shown in Figure 2.5 is the shape of use
case which is oval with the function name written
in the middle.
Figure 2.3
b.
Actors
Use-case occurs because of trigger from external
users called actors. Actors are everything which
interacts with the system to accomplish something.
Actors can be anything such as human,
organizations, another systems, items, or even time.
Use case symbol
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