عنوان مقاله [English]
One of the concepts discussed in meta ethics which is applied in moral situations and has an important role in moral judgments, is obligation or duty which is normative. William David Ross was a philosopher who talked about this subject in detail and differentiated this concept with that of value. He was highly influenced by Prichard’s thoughts, therefore it is important to scrutinize his moral ideas. This paper tries to examine his intuitionism and meta ethical view in light of Prichard’s thoughts. The method of this research is comparative- analytic, and has used books and on line resources in order to see in what extent he accepted Prichard’s ideas and in what extent we can call his thought new. Finally, this research concludes that although Ross was was highly influenced by Prichard, he could overcome his difficulty and bring up his new idea about primafacie duties and differentiate the concept of obligation with that of good according to his meta ethical views.