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It is basically clear to all project participants what belongs to the system and
what doesn ??™ t. However, these views can blur directly at the system boundary. What
clearly belongs to a system for some parties could be seen as external interaction
partners by others.
The system context diagram shows the system ??™ s environment and thus the
system boundary. It is not a predefi ned diagram of SysML or UML, but a variant of
block diagrams. 9 In the center of the diagram is the system under development. It
is a block with the stereotype ?«system?» . This clearly distinguishes this block from
other system blocks yet to be identifi ed. All currently known interaction partners
are denoted all around the system and associations are used to connect them.
2.3 Modeling the System Context
9 In UML class or composite structure diagrams. The use case diagram can also be used for the simple
variant.
Table 2.6 Summary: Identify system actors.
Reference card : Identify system actors.
Incoming and outdoing data
Requirements:
General requirements to the system.


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