+ 0 Votes Bingo JamesRL 1 year ago I've interviewed and hired a fair number of developers in the last 10 years. There is a huge delta between, used in school, or done a couple of small projects, in a technology and used the technology in some major applications. It isn't even necessarily about how long you've used a technology, it is how deep you got into it, and how you used it. I've used Excel for over 20 years, but I am no expert. I'ved Visio for a quarter of that time, and I'm pretty good. The matrix might help you weed out people you don't need to interview, but it won't help you make a hiring decision. That is what interviews are for.