Use-case tree

Let's look at one use case associated with this system: the user obtaining a lottery ticket using the lucky dip option (Use Case 1, Scenario 2). To verify that our system satisfies this requirement, we must identify this sequence of events on the use-case tree as a sequence of branches, from the root node to a leaf node. This can be identified in Path 2 (Listing 1). The sequence of events in the use-case scenario can be mapped against the methods the branches in the paths represent