Everything You Ever Wanted To Know About Usability Testing
Timothée Goguely

Usability tests check if people can use a product. Duh. But what does "usable" mean? Steve Krug, author of Don't Make Me Think, summed it up: "It really just means making sure that something works well: that a person of average ability and experience can use the thing-whether it's a website, a toaster, or a revolving door - for its intended purpose without getting hopelessly frustrated."