This book represents an important part of the extension and expansion of the Functional Requirements for Bibliographic Records. It contains an analysis of attributes of various entities that are the centre of focus for authority data (persons, families, corporate bodies, works, expressions, manifestations, items, concepts, objects, events, and places), the name by which these entities are known, and the controlled access points created by cataloguers for them. The conceptual model describes the attributes of these entities and the relationships between them.