The Utilitarianism of John Stuart Mill

There's an interesting departure, it seems to me, between that principle and the arguments that John Stuart Mill makes in On Liberty. One way to be a utilitarian is to think that on kind of a case-by-case basis, we should look at whether their action produced the most good. And because philosophers have a name for everything, we call that act utilitarianism. A different way to be one is to evaluate something like moral rules. The best rules are the rules that would best promote happiness for people generally to accept.