A good way to describe a use case scenario is with a state chart.

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A state chart is a graphical representation of the states an object, system, or process can be in, and the events that cause it to change from one state to another. While a state chart may be used to help model a use case scenario, it is not the only or necessarily the best way to describe a use case scenario. Use case scenario descriptions typically start with a narrative that describes the actors involved, the goals of the scenario, and the steps involved in achieving those goals.

A Good Way to Describe a Use Case Scenario Is