This is just worse than being a grammar nazi IMHO. It's not even about being correct - both representations are OK. If we're really nit-picking, we can say tha

This is just worse than being a grammar nazi IMHO. It's not even about being correct - both representations are OK. If we're really nit-picking, we can say that the language is shaped by the people speaking it, and thus Google Trend could be a good starting point: https://trends.google.com/trends/explore?q=Less%20data,Fewer%20data https://trends.google.com/trends/explore?q=Less%20data,Fewer... It seems like "less data" is far more common. But again, we're nit-picking, and this is taking my initial post to the extreme limit. If he would have marked off an applicant for such a thing, he really shouldn't evaluate CVs in the first place, as he would be doing some kind of gatekeeping towards people with the exact same "ideals".