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Model-Driven Development Process
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Return to Requirements Gathering Develop Use Case Diagram Task
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.
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.
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.
Suggested Step Flow
Download Develop Use Case Diagram Task Guidelines in Word
Guidelines, Templates and Examples
Download Develop Use Case Diagram Task Guidelines in Word    Download System Use Case Model Template in EA    Download an Example of a System Use Case Model EA    Download an Example of Business Model to System Use Case Model Mapping in EA   
System Requirements Definition Using Use Cases
System Requirements Definition and System Analysis using Use Cases and UML
Business Analysis, Requirements Definition and Systems Analysis using UML
Business Analysis and System Requirements Definition using UML and Use Cases
Object Oriented Analysis and Design using UML (OOAD)