This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
If your customer doesn't know what they want, frame your solution - to give them just enough to get by; thus that should limit your scenarios. If they know what they want; they will tell you the scenarios. Cheers, Pho