The User Advocate: Interactive Prototyping, Part 1: Easy PDF Prototyping
http://www.gotomedia.com/gotoreport/may2005/news_0505_usable1.html

Rogers, David J.
GotoMedia
2005

Abstract:

I've often observed that once wireframing begins, it's off to the races! In the rush to launch, we sometimes forget end-users. Is there a way to ensure that they get a voice during this always-hectic phase?