An ongoing controversy exists in the prototyping community about how closely in form and function a userinterface proto- Low vs. Hightype should represent the final product. This dispute is referred to as the “Low-versus High-Fidelity Prototyping Debate.’’ In this article, we discuss arguments for and against low-and highfidelity prototypes, guidelines for the use of rapid userinterface prototyping, and the implications for user-interface designers. 00 76 interactions . . . january 1996