Test Paper Prototypes to Save Time and Money: The Mozilla Case Study (Susan Farrell)

We often advocate using a parallel and iterative design process to explore design diversity, because it produces much better user experiences. A cheap way of implementing this type of design process is rapid paper prototyping. Paper prototyping is not only efficient for progressing designs quickly and allowing designers to find their best-of-breed with minimal investment, but it is also fast, fun, and easy to learn. (nngroup.com)