If you remember this one thing you will practically never go wrong with getting your use cases at the right level of granularity.
Use cases end whenever the user would comfortably get a cup of coffee. This probably goes for process tasks as well. All my ramblings about Elementary Business Processes are just commentary to this idea.
(For a long time I was walking around saying this without realising it was a Cockburn line. So I hereby retroactively credit him for all my past uses of this concept without accreditation. It wasn't until a recent IIBA newsletter I even realised it came from him.)
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