22 ). Blocks are a concept of the SysML language. We will be looking at
blocks more closely in Section 4.5.
2.3 Modeling the System Context
FIGURE 2-20
Information fl ow between actors.
Car management
system
Car service
employee
Status request
?«flow?»
bdd [package] System context [information flow between actors]
?«system?»
On-board computer
PROJECT DIARY
Project Time 5942
We managed to excellently use the system context diagram in a workshop with
the domain experts. Though not all of the participating domain experts came from
the engineering field none of them had trouble understanding and commenting the
diagram. That ??™ s very beneficial for our project, since we can coordinate the models
directly with the principal, who will now be jointly responsible.
In contrast, there were fierce discussions about the planned navigation system.
Though they considered it a very good service, they feared, on the other hand,
that customers may feel they are being watched, because SpeedyCar would be
technically able to determine the current position of a car at any given time.
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