W. D. Ross developed ideas as to how people choose between conflicting duties. He called this prima facie - first appearances - and these presented as a number of duties that one should follow, including to keep our promises and not harm innocent people. If there is a conflict between two or more duties, then I have to balance them and consider what to do. When moral intuition comes in, one is forced to consider conflicting duties. According to Ross’ prima facie, if you had to choose between lying or harming your friend, lying would come first.