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74 Model Driven Systems Development with Rational Products
So that we can add additional items to the white-box expansion, we use a tabular
format for an operation specification such as Figure 4-3. This template can be
customized to meet the needs of specific modeling situations.
Figure 4-3 Operation specification example
Enterprise operation: Initiate New Sale
Black-box perspective:
– Clerk starts new sale
– The system enables the scanner
White-box perspective:
– The Point-of-Sale subsystem clears the transaction, brings up a new
sales screen, and requests the Order Processing subsystem to create a
new sales list
– The Order Processing subsystem starts a new sales list
– The Point-of-Sale subsystem enables the scanner