Lane Becker writes, "Rather than a validation done once before completing a product... internal, qualitative usability testing [should be] done earlier, more frequently, and as part of the design process - not separate from it."
Guidelines written for webmasters, communicators and marketers to assist with website design for maximum usability for seniors and older internet users.
Web site designers should think hard about how to keep users from muddling around on their sites. "Users muddle when it isn’t clear what they are supposed to do in any given situation."