In human–computer interaction, __paper prototyping__ is a widely used method in the user-centered design, a process that helps developers to create software that meets the user's expectations and needs—in this case, especially for user interface design and usability testing user interfaces.
Paper prototyping in action
- wikimedia 
It is throwaway prototyping and involves creating rough, even hand-sketched, drawings of an interface to use as prototypes, or models, of a design. While paper prototyping seems simple, this method of usability testing can provide a great deal of useful feedback which will result in the design of better products. This is supported by many usability professionals - wikipedia 
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