Most of time we use use cases to extract the domain model from the business people mind’s. As stated by the term itself, use cases should be created by the business user itself. But for a lot of persons(both analysts and business people), wrapping your head around the concept of a use case is very hard. Most of the time the only business persons you can ask for a use case have a technical background.
So I think it’s better to take another approach and don’t ask for a use case, ask for an example. If a business person cannot give you an example, you’re talking to the wrong person.
That implies that they are two different approaches to the same goal, both use cases and examples have their place in helping to understand and create the domain model.