Narratology refers to both the theory and the study of narrative and narrative structure and the ways that these affect our perception. While in principle the word may refer to any systematic study of narrative, in practice its usage is rather more restricted. It is an anglicisation of French narratologie, coined by Tzvetan Todorov (Grammaire du Décaméron, 1969). Narratology is applied retrospectively as well to work predating its coinage.