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The ideal source for the system use case model is a business model. If this is available,
then system actors and system use cases can be explicitly mapped from business actors,
business workers, primitive business processes and business worker responsibilities.
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Otherwise system actors and use cases will have to be found directly from a stakeholders
understanding of the system requirements. This would normally be done in a workshop with
the stakeholder.
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The diagram cannot be fully structured until the detail of the use case flow has been developed,
so don't spend a lot of time developing the diagram before developing the use case document.
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