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System context:
System with actors.
Motivation/description
Why? The system actors are direct interaction partners, for which services and
interfaces have to be developed. They describe the system boundaries.
What? All users and systems that will interact with the system under development
are identifi ed and their roles are modeled.
How? The system actors are primarily derived from the requirements and modeled in
the system context diagram.
Where? The services and interfaces for the system are identifi ed on the basis of the
actors.
Guiding questions
?–  Who or what belongs to the system?
?–  Who or what interacts with the system?
?–  What communication partners do you want to focus on?
?–  What aspects do you want to emphasize with an actor category?
SysML elements
Block defi nition diagram, internal block diagram, SYSMOD: system, actor (SYSMOD:
actor categories, e.g., environmental effect), association, role, connector.
Identify system
actors
System context
Requirements
48 CHAPTER 2 The Pragmatic SYSMOD Approach
The system ??™ s interaction partners, i.


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