The information fl ow leads to a better understanding of the domain. We are
interested only in domain-relevant information and not in technical details.
2.3 Modeling the System Context
Table 2.7 Summary: Modeling the system/actor information fl ow.
Reference card: Model system/actor information fl ow.
Incoming and outgoing data
System context:
System with associated actors.
System context [information fl ow]:
System with information fl ow from and to the
actors.
Motivation/description
Why? The system ??™ s information fl ow with its environment is required for a clear
understanding of the system embedding.
What? Describe the information that the system will exchange with its environment.
How? Relevant information that actors send to or receive from the system is
documented for each actor. Focus on the direction of the information fl ow from an
actor to the system.
Where? The information fl ows are used in the analysis to identify and describe use
cases. In the system design these information fl ows have to refl ect within the system
and correspond to the system interfaces.
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