Abstract
Information technology has developed new methods for accumulation of cultural artifacts, and has also changed social perspectives, while information shock caused unprecedented changes in the world in all areas of human activity including librarianship. Libraries strive to respond to these challenges adapting themselves to the change, questioning at the same time validity of the requirements defined by Paris Statements of Principles observed in wider context of global environment, as well as questions regarding suitability of catalogue requirements. The article presents context within the IFLA Studies Functional Requirements for Bibliographic Records (FRBR) and Functional Requirements for Numbering of Authority Records (FRANAR) and show conceptual changes occurring in descriptive cataloguing. Development of these Studies is conditioned by two requirements: improvement of quality of service towards traditional holders of recorded knowledge, and expansion and development of equivalent level of services for everything that is new in information environment.

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