Five Paper Prototyping Tips
http://www.uie.com/articles/prototyping_tips/

Klee, Matthew
User Interface Engineering
2000

Abstract:

Prototyping is a quick way to incorporate direct feedback from real users into a design. Paper-based prototyping bypasses the time and effort required to create a working, coded user interface. Instead, it relies on very simple tools like paper, scissors, and stickies. Even in applications where new technologies are deployed, paper provides maximum speed and flexibility.