End users think in terms of screens, if you can provide them with a fully functioning ui then you can get valuable feedback about useability up front. The clien

End users think in terms of screens, if you can provide them with a fully functioning ui then you can get valuable feedback about useability up front. The client knows in short order that they are getting all of the features they want because the get to touch and feel the system. After I adopted this method my project change orders slowed to a trickle.