 Related and additional criticisms of Edgington’s proposal appear in Wright (1987), Williamson (1987b; 2000b) and Percival (1991). Formal developments on the proposal, including points that address some of these concerns appear in Rabinowicz and Segerberg (1994), Lindström (1997), Rückert (2003), Edgington (2010), Fara (2010), Proietti and Sandu (2010), and Schlöder (forthcoming).