There is an extensive literature devoted to developing models that can represent the players’ unawareness. See Board, Chung, &amp; Schipper (2011); Chen, Ely, &amp; Luo (2012); E. Dekel et al. (1998); Halpern (2001a); Halpern &amp; Rego (2008); and Heifetz, Meier, &amp; Schipper (2006) for a discussion of issues related to this entry. The Unawareness Bibliography (see Other Internet Resources) has an up-to-date list of papers in this area.