Write a motivational letter applying for PhD degree in social science with focus on social policy analysis . in the letter , mention why I am applying to such program even when my background in international political science – security studies , how my background will me help to apply for such program make me a fit candidate . mention why interested for such program , future goals. what are the reason applying to PhD .why the university will right place for me .mention how working as research assistance will help to get in phase of being a PhD student .