In any particular structure, certain beliefs, beliefs about belief, …, will be present and others won’t be. So, there is an important implicit assumption behind the choice of a structure. This is that it is “transparent” to the players that the beliefs in the type structure—and only those beliefs—are possible ….The idea is that there is a “context” to the strategic situation (e.g., history, conventions, etc.) and this “context” causes the players to rule out certain beliefs. (Brandenburger &amp; Friedenberg 2010: 801)