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A boundary system is a special external system that provides an interface to
another external system. For example, this can be a sender that enables contacting
another system. It is comparable to a user system, except that a boundary system
is a mediator for another system rather than for a human.
A boundary system is only used if it has a special modeling signifi cance.
Otherwise, the external system is a direct actor.
FIGURE 2-14
The user system ??? cell phone. ???
bdd [package] On-board computer context [study: access
via cell phone]
Customer
Cell phone
Customer
information
?«flow?»
?«system?»
On-board computer
50 CHAPTER 2 The Pragmatic SYSMOD Approach
Similar to an external system, a boundary system is denoted as a box with an
additional fi sh symbol ( Figure 2.15 ). The fi sh symbol is also known as a boundary
symbol in software class modeling.
Several factors from the environment infl uence the system without directly
interacting with it. This includes environmental effects such as temperature, precipitation,
or oxygen.


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