Functional Requirements for Subject Authority Data (FRSAD), previously known as Functional Requirements for Subject Authority Records (FRSAR), is a conceptual entity-relationship model developed by the International Federation of Library Associations and Institutions (IFLA)[1] and published in 2010. It is a continuation of the work done on the FRBR model, detailing how "entities that serve as subjects of intellectual or artistic endeavor"[2] can be related and controlled within the bibliographic universe. The model is intended to support global sharing and reuse of subject authority data.