 Ross is not exactly right here, for one has to engage in a fair amount of comparison of rival acts open to one in terms of their balance of prima facie rightness over prima facie wrongness. The idea is our prima facie principles provide moral considerations or factors of direct relevance to the morality of each of the acts open to us. We have to judge with respect to each act open to us to what extent prima facie rightness outweighs prima facie wrongness and then compare acts with each other in terms of their balance of prima facie rightness over prima facie wrongness and then determine which act has on balance the greatest amount of prima facie rightness over prima facie wrongness. The act with the greatest balance of prima facie rightness over prima facie wrongness is what you ought all things considered to do and is therefore your actual obligation. The act which is one’s actual duty is the one for which one is most responsible or to which the weightier of one’s responsibilities attach of those acts open to one (FE 85; RG 41–42).