Guiding questions
?– What information will the actors send to the system?
?– Does the information have domain relevance for our system?
?– How does the system integrate itself into its environment?
?– What information does the system send to its actors?
SysML elements
Block defi nition diagram, internal block diagram, block, actor, association, role,
connector, information, information fl ow.
Model system/actors
information flow
System context
[information flow]
System context
56 CHAPTER 2 The Pragmatic SYSMOD Approach
The diagram gives us a good insight into how the system is embedded in its
environment. The meaning of the term domain is relative. What is domainrelevant
depends on the type of system. If the system is very technical, such
as an engine control, then domain-relevant things would be much more
technical than in our system.
2. The information fl ow serves as basic information to determine the services
demanded from the system??”the use cases (see Section 2.4.1). The information
fl owing toward the system are potential requests for services from the
environment.
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