Example: NextGen SSD - UML

An SSD shows, for a particular course of events within a use case, the external actors that interact directly with the system, the system (as a black box), and the system events that the actors generate. Time proceeds downward, and the ordering of events should follow their order in the scenario.

The Figure example is for the main success scenario of a cash - only Process Sale scenario. It indicates that the cashier generates makeNeivSale, enterltem, endSaie, and makePayment system events. These events are implied or suggested by reading through the use case text.

SSD for a Process Sale scenario

SSD for a Process Sale scenario

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