Rule Utilitarianism vs. act utilitarianism
The key difference between act and rule utilitarianism is a matter of the criteria for judging moral actions. Act utilitarianism is interested only in an action's impact when judging if that action was good; a rule utilitarian, on the other hand, would be interested in the goodness or badness of the moral rule that the action follows. Rule utilitarian's prioritize good general rules over the particular consequences of a given action, whereas act utilitarian's focus on these particular
consequences and not on rules.