The concept of possible worlds, originally introduced in philosophical logic, proves to be a productive tool when borrowed by literary theory to explain the notion of fictional worlds. Ruth Ronen develops a comparative reading of the use of possible worlds in philosophy and in literary theory. She suggests new criteria for the definition of fictionality; and through specific studies of domains within fictional worlds—events, objects, time and point of view—she proposes a radical rethinking of fictionality in general and fictional narrativity in particular.