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3 Modeling the System Context
FIGURE 2-26
A SysML information fl ow.
ibd [block] On-board computer context
[with information flow]
?«system?»
:On-board
computer
:Car management
system
kfgVs:Configuration
Customer
ssig:KeySignal
:Reservation
system
nb:Usage right
:Car movement
data
km:Mileage
:Central
locking system
zvCmd:Car
command
wsCmd:Car
command
:Car drive-away
protection
:Billing
system
nd:Usage data
:Car service
employee
kfgFs:Configuration
:Car
ignition
eOff:EngineSignal
s:Status
:Temperature
:Battery
s:Current
:Car
vK:Vibration
This modeling offers no more than a small benefi t without system interaction
points: real objects instead of information can fl ow between actor and system.
Relationships between actors can be modeled using connectors where, in turn,
other object can fl ow (see car management system and car service employee in
Figure 2.26 ).
At this point it is a good idea to think about the required depth of details in
your information fl ow modeling for your project. Are the pieces of information,
i.


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