 Regardless of its status as a modal locution, Rosen recognizes that it is a very unsatisfying primitive: the notion of a proposition being true according to PW is an unlikely one to be considered basic and unanalysable. Whether or not this is a fatal flaw of Rosen’s proposal is, he acknowledges, “a matter of somewhat delicate judgement” (Rosen 1990, p. 349). What he does have to say about it, however, is that arguably many realists about possible worlds have also not provided a satisfactory analysis of the “according to the fiction …” operator, and so face the same  challenge.[7] 