Dennison asked excellent questions in response to How to Do Usability Testing Cheap and Fast:
Tell me if I follow correctly: Do you do the test only on users that have their own PC with them? So if you happen to be in a store where nobody has a machine or is willing to take the test, then, tough luck?
Why worry about having the users test in their own environment (PC)? The focus of the test is on usability. Testing to see if the site works properly across different systems should be part of QA work and can be done separately.
Bill Moore from RadioTime responded:
Gas Station Usability Problems
I go to various gas stations to fill up a thirsy car. The one in my neighborhood takes longer to use because of its strange set up. Most gas stations have the screen and buttons next to each other. Not this one. The buttons appear near the nozzle and the credit card slot. The screen … Read more