[PDF.87sk] Prototyping for Designers: Developing the Best Digital and Physical Products

Prototyping and user testing is the best way to create successful products, but many designers skip this important step and use gut instinct instead. By explaining the goals and methodologies behind prototyping—and demonstrating how to prototype for both physical and digital products—this practical guide helps beginning and intermediate designers become more comfortable with creating and testing prototypes early and often in the process.

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You can specify the type of files you want, for your gadget.Prototyping for Designers: Developing the Best Digital and Physical Products   |  Kathryn McElroy. A good, fresh read, highly recommended.