1. Start with the so-called Frankfurt cases (these are due to Harry Frankfurt (1969), which show elegantly that with regard to the concept of ‘free will’ neither leeway (access to alternatives) nor sourceness (singular agent initiative) are sufficient. Here are two simplified adapted Frankfurt cases: 1) Someone (Person A) believes he/she choses to stay in a room, but unbeknownst to A, the door has been locked locked from outside; 2) Person B can choose to do behavior X, but unbeknownst to B, if some behavior other than X would have been chosen by B, a drug would have been administered to B to ensure that B did do behavior X.