Example of controlling a security camera online. user can pan camera, take a snapshot etc through an web browser. How do I draw a use case when user encounter problems eg. the network is down, unable to pan camera.
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The use case is still the same Control area with camera. What you now see is an error path in a scenario. This is business as usual. The error path will likely be to start camera maintenance (as another use case called Maintain defect camera). You might need to extend the UC with another one called Control area manually.
qwerty_so
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