Functional Requirements: the FRBR Family of Models

The "FRBR family" of conceptual models consists of three entity-relationship models which are not cataloguing rules but rather conceptual models on how bibliographic data may be configured as the basis for the implementation of such rules.

• Functional Requirements for Bibliographic Records (FRBR), published in 1998. 
• Functional Requirements for Authority Data (FRAD), published in 2009. 
• Functional Requirements for Subject Authority Data (FRSAD), published in 2010.

The FRBR family of conceptual models is maintained and reviewed by the IFLA FRBR-Review Group. The Group aims to publish a consolidated model combining the three different models.