"In human–computer interaction, paper prototyping is a widely used method in the user-centered design process, a process that helps developers to create software that meets the user's expectations and needs - in this case, especially for designing and testing user interfaces. 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."
Reference：
http://en.wikipedia.org/wiki/Paper_prototyping
延伸閱書：
Paper Prototyping: The Fast and Easy Way to Design and Refine User Interfaces
