Great suggestions. Can we plan to chat some more once I have more data? I can tell you some more of my observations and you can give more suggestions. Also, if you think of anything else do not hesitate.
Sure.
One last thing, which you probably already know -- the model for skills is multiplicative, which means that any regression you want to run should have the logs of skills on the right-hand side.
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."