French to English Bus/Financial Human Resources skills matrix headings

I'm translating a job description for a data analyst, but I have no idea what type of company it's for. The skills matrix contains the usual selection of knowledge, technical and social skills, with "x" marked in one of four columns headed D, O, M and D. This is explained at the bottom of the matrix:
D-O-M-D = Débute-Occupe-Maîtrise-Domine
I believe this is a standard term used by Auchan, Carrefour, etc. (but as I say, I have no way of knowing the sector here). What I don't know is whether there is standard wording in English. I've often found them with numeric values (e.g. 0, 0.25, 0.5, 0.75, 1) or with an alphabetic notation (e.g. A-H). I've seen "simple, intermediate, complex" but that wouldn't suit the 4-column context. If there aren't standard terms in English, I'm open to suggestions for the four levels. My first suggestion would be
"Basic; Competent; Mastered; Expert". Any views?

TIA, Sheila