There's a forum called Process: UP, RUP, XP, etc. a little further down the ranch where this kind of conversation goes on all the time. You'll get more responses down there. Meanwhile, look at Scott Ambler's AgileModeling.com and search for use cases. He's pretty level headed about them. If you have a good library or budget for a book, look for Alistair Cockburn's Writing Effective Use Cases. And be aware that the "agile" crowd will bad-mouth use cases and push you toward "user stories". See http://www.extremeprogramming.org for an overview of an agile method called XP. See ya down the page!
A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi
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