 It is a matter of some dispute whether event causation and agent causation can be combined in this fashion and, if they can be, whether the combination would provide what incompatibilists think necessary for free will. (For discussion of these points, see Clarke 2003b: 144–48 and 2011; Ginet 2002; O’Connor 2000b: 76–70; and O’Connor and Churchill 2004.)