 In what follows, we focus our attention on the two most commonly cited features of free will: the freedom to do otherwise and sourcehood. While some seem to think that free will consists exclusively in either the freedom to do otherwise (van Inwagen 2008) or in sourcehood (Zagzebski 2000), many philosophers hold that free will involves both conditions—though philosophers often emphasize one condition over the other depending on their dialectical situation or argumentative purposes (cf. Watson 1987). In what follows, we will describe the most common characterizations of these two conditions.