Paper Prototyping

Such a wonderful thing as paper prototyping has often been overlooked as unprofessional in appearance, a first step but nothing you should test, or unnecessary. These are all fallacies. The utility of paper prototypes stems from their low-resolution appearance and quick turn around time. You can test one user in the morning and correct any flaws by your afternoon session. The low-res appearance makes the tester more likely to point out functional flaws and not design, which is the goal of initial testing. So buy a good book on the subject (I suggest "Paper Prototyping" by Carolyn Snyder) and try it out on your product development today.