More on UML Use Cases in Requirements Analysis
This section goes into more detail on use case diagrams for requirements. What components are in a use case diagram (actors, extensions, stereotypes, and notes)? How are different interactions and features depicted for people who use the application? How are these features mapped into a use case diagram? Remember that a use case diagram cares about "what", not "how". This discussion provides a "big picture" of use cases, their use, and their relationship with "white box" details. These essential elements comprise a use case, rules-of-thumb guidance, the importance of the narrative text connected to a use case diagram, and user stories as an alternative to a use case diagram.
Source: Mike Murphy, https://ia904600.us.archive.org/3/items/use-cases/Use%20Cases.mpeg4
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