Not sure if you noticed, but the linked article is on
http://cooper.com, which was founded by Alan Cooper.
Ironically and incredibly, with current Chrome on Mac, I am unable to scroll to the bottom of the page on their site describing the book: http://www.cooper.com/#about:books
>http://www.cooper.com/#about:books
It's horrible on safari as well and a little better on firefox (mac also), but the "Experiencing technical issues?" link to the plain vanilla version at the bottom left hints at the experimental state of the interface.
Ironically and incredibly, with current Chrome on Mac, I am unable to scroll to the bottom of the page on their site describing the book: http://www.cooper.com/#about:books
Kindly, the old working version of their site is still available: http://www.cooper.com/about/books.html