I have some questions regarding use case structuring:

1) I am working on one use case with several scenarios. Many of the
scenarios within this use case have common functionality between them.
However, the common functionality is only reused within the scenarios of the
same use case, not across use cases. How do I model this? 

2) When documenting the steps within a scenario, I came across a requirement
to repeat a number of the steps until a certain condition is true. How is
this iteration best communicated within a scenario? 

3) Can a use case extension itself have an extension, or is there some other
way to communicate this?

Thanks,
Bob Lawson

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