The video shows a real case were prototyping is used to really find out the requirements for a project.
When showing the users the consequences of what they have told the project so far – the quality of the specification is taken to a much higher level… A level that makes even me think “Maybe even an offshore outsourced developer can deliver what we want in one go”.
But even faster would be to fire up the specification in ECO – The model driven framework for Visual Studio 2010.