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I'm developing a real-time fraud detection system for a bank. The job of this fraud detection system is to decide whether the incoming transaction is fraud or not. The system has no interaction with the banking customer. The fraud detection system has use cases like capture incoming transaction data, calculate the risk level of the transaction, etc.

How to draw a use case diagrams for this type of a situation?

Arunoda Samarasinghe
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Actors in a use case diagram (or when identified in textual or tabular representations of use cases) do not need to be humans. Other systems can also be actors. The system can also be an actor that invokes use cases in other systems, but this would be indicated on a use case diagram for the other system and not your diagram for the fraud detection system.

Thomas Owens
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