Sometimes prototyping can seem like a big investment of time, but I find it is always worth it.
In this article on User Experience Prototyping, Paul Boag, who has been in the field of user experience for over a decade, writes about the benefits of prototyping.
When most people think of prototyping they are thinking about mocking up a user interface. There is no doubt that prototyping can help in this area. Organisations use prototyping to define and test experiences using all kinds of interfaces. Interfaces from mobile apps to enterprise systems.