The Concept of "Interfaces"
Novell recently released some video of "usability" testing featuring 11 people who were familiar with Windows trying to accomplish various tasks under the Linux Desktop.
Now, to me, that doesn't sound really effective. The reason is that you'll have only two groups of test subjects:
A. The Ignorant
B. The Tainted
The Ignorant are the ones that have not used any other systems. Which, in this case, pretty much means that they haven't used any system.
The Tainted are the ones that have used at least one other system.