What is the $1 Prototype Mobile Design Methodology? (Book Excerpt)

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The state of your prototype must reflect the state of completion of your system. This simple guideline is also very profound. The degree of certainty in your design should be reflected in the level of completion of your prototype. The project starts with a rough storyboard which is highly uncertain and full of assumptions: no one knows if
the audience will find the product useful, if they will pay for it, or even if the product can (or should) be built.