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You can see an allocate
activity partition in Figure 2.81 and other ways of using an allocate relationship
in Section 4.4.
FIGURE 2-80
Block defi nition diagram for our on-board computer.
bdd [package] On-board computer [section]
?«system?»
On-board computer
?«block?»
Card reader
?«block?»
Customer card
?«block?»
Communication unit
?«block?»
On-board computer
control
?«subsystem?»
Navigation system
?«block?»
GPS antenna
FIGURE 2-81
Allocating a fl ow to system structures.
?«essential?»
act Identify customer
Read customer
card
Identify
customer
Customer
?«allocate?»
Card reader
?«allocate?»
Customer card
Transmit
card data
Card data
?«allocate?»
On-board computer control
Customer
Card data Card data
Card data
124 CHAPTER 2 The Pragmatic SYSMOD Approach
We can do some further detailing of the blocks we previously identifi ed if
needed. If we do, we proceed in exactly the way we came from the entire system
and arrived at the system structure in Figure 2.76 . As an example, Figure 2.82
shows the customer card detailing.


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