 While this argument is simple, eloquent, and rather intuitive, it has been widely criticized by compatibilists and libertarians alike (see, e.g., Hurley 2000; Clarke 2005a; Bernstein 2005; Fischer 2006; Kane 2000; Coates 2017; for replies see Istvan 2011; Parks 2009). Some critics question Strawson’s notion of ultimate responsibility, which he defines as 