Aptitude is define as natural/inherent talent to acquire certain skills/ability in the future through appropriate training. Aptitude can both mental as well as physical. The basis of APPTITUDE TOPICS is the inner interest of a Person. However, APPTITUDE TOPICS of a person is always checked or evaluated by some outer agency . For ex: UPSC, MPPSC etc.So skills refer to the things which we have learnt in the past. And ability refers to the things which we can do or perform now due to the skills acquired in the past through Training. But the relation between the Ability and Skills and APPTITUDE TOPIC can understood through the following diagram and Accountability. And It refers to the post-factor mechanism to ensure responsibility.So in simple words Accountability is the responsibility of a person for his action.And also inaction during the performance of his duty.