Transmedia is a set of techniques that use multiple media platforms (books, films, games, live performances, etc.) to create a single narrative. The thesis investigates how transmedia resources can be described and accessed within the conceptual framework provided by the FR family of data models and the FRBRoo ontology. Principal characteristics of transmedia compositions will be analysed in order to identify those relevant to the representation of this type of content in bibliographic and authority databases. These characteristics will be translated into entities, attributes and relationships (or classes and properties) defined in the conceptual models.