9.6. System Events and the System Boundary
To identify system events, it is necessary to be clear on the choice of system boundary, as discussed in the prior chapter on use cases. For the purposes of software development, the system boundary is usually chosen to be the software (and possibly hardware) system itself; in this context, a system event is an external event that directly stimulates the software (see Figure 9.3).
Figure 9.3. Defining the system boundary.
Consider the Process Sale use case to identify system events. First, we must determine the actors that directly interact with the software system. The customer interacts with the cashier, ...
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