Do It (2004)
>>The user tests were conducted in a specially constructed room featuring a one-way mirror, so observers could watch the tests without being intrusive. The tests were conducted by a moderator who made sure the user felt comfortable and showed her the basics of using a mouse. Then, with no further instruction, users were asked to perform specific tasks, without help from the moderator, like editing some text and saving it. The moderator encouraged each user to mumble under her breath while doing the tasks, revealing her current thinking as much as possible. Each session was audio or videotaped for later analysis.Amazing to see the importance they gave to UX/UI and the level of sophistication they had forty years back.