As we look at other fl ows we will
see that the interfaces will gradually contain more elements.
We also consider interaction points that are not used by messages in the
sequence diagrams. There are vibration forces that affect the system over this port.
This is not an interaction that could be meaningfully described by a standard port
and interfaces. CarPort is an atomic object fl ow port, which transports objects of
the type vibration to one direction??”from the outside to the system.
A SysML design rule says that the interfaces of the standard ports should
specify only operations. Signals and data fl ows run across object fl ow ports. The
SYSMOD approach deviates from this rule with regard to the system ports if their
interaction partner is a human user. In this case, we always have to use standard
ports, and the interfaces may also contain signals.
PROJECT DIARY
Project Time 8042
The transition from the analysis to the design often leads to conflicting discussions
in the team. Some members headjump from the analytical board into the depths
of the design, arguing about minor details.
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