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Actor categories distinguish the different types of an actor, helping us to better
understand the system context and the use cases ( Figure 5.1 ). Each category
requires a different modeling approach, e.g., when identifying the use cases
(Section 2.4.1). The categories defi ned here are customary and have proven in
practice. Nevertheless, there may be a need for additional categories, or a subset
of the categories suggested here in a specifi c project, of course.
Figure 5.2 shows the symbols of actor categories. The fi gure does not list the
user who is a standard UML actor, i.e., users are not part of the profi le. The user
is denoted as a stick man. In our approach, we introduce the actor categories in
Section 2.3.1.
273
bdd [package] SYSMOD profile (actor categories)
?«metaclass?»
UML4SysML::Actor
?«stereotype?»
External system
?«stereotype?»
User system
?«stereotype?»
Boundary system
?«stereotype?»
Actuator
?«stereotype?»
Sensor
?«stereotype?»
Environmental
effect
?«stereotype?»
Mechanical
system
FIGURE 5-1
Stereotypes for actor categories.


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