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The Distribution of Users’ Computer Skills: Worse Than You Think (2016)
(www.nngroup.com)
This is a most excellent place for technology news and articles.
Are the user levels an actual defined thing and are there more?
The article quotes extensively from the study about this and gives examples regarding what kinds of tasks qualify for those levels.
After actually reading the article I see they're well-defined. Thanks for pointing me there ^^
They defined it for the study.
Obviously you'd find a level 3+ in many population groups but each would a fraction of the alrady small <10% level 3 population pool.