Paul Allen examines the importance of website usability testing and an easy way to do it as prescribed by Jakob Nielsen. From the article: “Invite 5 people to use your web site and you will find 85% of the usability problems. The cost of doing this is ridiculously low and yet most companies never watch real people try to use their web site. Therefore, many usability issues go unresolved, costing companies money every day.”
Family members and casual web users work just fine and are ideal.