 He seemed to change his mind about this in FE, where following Broad, he took the idea of a prima facie duty to be basic and he understood it in terms of fittingness to some aspect of a situation (FE 79–82, 84; Broad 1930, 218–220). In the simple case above, keeping your promise to your friend is a prima facie duty as it is fitting to one aspect of the situation and benefitting the accident victims is another prima facie duty as it is fitting to another aspect of the situation. It is not entirely clear whether in FE Ross relied on to the concept of duty proper or instead whether he relied on the idea of duty all things considered (Hurka 2014, 74–75). In any case, Ross’s view in FE is that we can understand prima face duty independently of the notion duty all things considered and we can define or understand the latter in terms of the former. 