I have now interviewed 2 people who initially claimed they were "LINUX" experts. Using SLin - I gave them a task to complete in 30 minutes or less. To break in and move a 25MB file from one partition - to another, and to perform a list of tasks (as many as they could before the time ran out). You should have seen the first "interviewee" - he was a wreck and about ran out of the office within 5 minutes. Second "interviewee" did almost every task - on point - and was definitely worthy of a title: Linux Expert. I hired both of them for my "Linux Team" - the latter being the senior addition to the team. This tool allows not just to test the skill level of a person with Linux - but also - how they deal with stress, their honesty and their ability to recover.