 Grading scale stoles from a Goolge interview

I copied this grading scale mechanism from a failed Google interview ;-)

One problem with it is that I am always very hesitant to put a 5 on anything, who can not look at the documentation?

It is also hard to scope things right. Who can claim to be a C++ or Linux kernel expert, even if you wrote a book about it, since those are such humongous topics?

As a result, I haven't updated this in a while, and things may be out of date.

If your project does something that interests me, I can what it takes to contribute. Tell me what I must know, how long I have to learn it, and I'll call you back when I've mastered it.