Philosophy
Default: IQ-6.
This is the study of a system of principles to live by. You must specialize in a particular school of philosophy; e.g., Confucianism, Marxism, or Stoicism. (If you study a religious philosophy, buy Theology skill.) When confronted with someone who subscribes to this philosophy, a successful Philosophy roll might provide insights into his behavior.
You do not necessarily believe in the ideals of the philosophy you study. If you do, you may ask the GM to make a secret roll against your Philosophy skill when you are faced with a moral dilemma. On a success, the GM will "enlighten" you and provide a hint as to which course of action "feels" right given your beliefs.