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table [package] On-board computer requirements
ID
R1
R2.1
Name Text
Car rental without staff The cars must be picked up and returned
by customers without assistance.
Enclosure size
R2.2 On-board computer weight The on-board computer must not
exceed the admissible weight of 2.5 kg.
The on-board computer has to fit
in a DIN compartment.
FIGURE 4-20
Table notation for requirements with relationships.
table [package] On-board computer requirements [with relationships]
ID
R1
R2.1
Name Relation ID Name
Car rental without staff deriveReqt R7.8
trace ...
...
Enclosure size
239
The object fl ow allocation is used to connect an item fl ow in a structure diagram
with an object fl ow edge in an activity diagram ( Figure 4.21 ).
The structure allocation allows you to separate logical structures from physical
structures. In a fi rst approach, the systems engineer can build the system logically,
while building the concrete hardware structure of the system in a second step.
The structure allocation binds elements of both levels.


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