Full Idea
The doctrine of the mean does not require the doctrine of moderation: if I say we should drink lots of alcohol once a week, but you propose a little each day, your view is more in line with moderation, but we can agree on the doctrine of the mean.
Gist of Idea
One drink a day is moderation, but very drunk once a week could exhibit the mean
Source
comment on Aristotle (Nicomachean Ethics [c.334 BCE], 1106b16) by J.O. Urmson - Aristotle's Doctrine of the Mean p.162
Book Reference
'Essays on Aristotle's Ethics', ed/tr. Rorty,Amélie Oksenberg [University of California 1980], p.162
A Reaction
So two people could agree on the doctrine, but end up behaving differently. This is important for virtue theory. In a moral dilemma there might be several right things that could be done.