Yeah I don't buy this either. I do think the original Dunning-Kruger plot is a bit of an odd presentation. The way I look at it is just to say that people's s

Yeah I don't buy this either. I do think the original Dunning-Kruger plot is a bit of an odd presentation. The way I look at it is just to say that people's self-estimates of their ability fall into a relatively narrow range (e.g., 55-75th percentile on the graph), whereas their actual abilities of course cover the whole range from 0-100th percentile. You don't really need the plot of "x versus x" (average score in each quartile). You just need to say "people's self-assessments seem to start unrealistically high and only go up a little, even as their ability goes up a lot".