According to UNESCO / Library of Congress Survey, bibliographic control means “the mastery over written and published records which is provided by and for the purpose of bibliography”. Effective bibliographic control should be made at subject and national level.
A) National Bibliographic Control: The national library ensures the bibliographic control of all the books or book-like documents published in that particular country. It has the provision of legal deposit by a host of different programs such as a cataloguing in publication service or similar mandatory practices. By cataloguing in publication service, the Library of Congress gives a complete catalogue entry of a book to any publisher who sends a final draft or some form of galley proof of a book currently in production.
B) International Bibliographic Control: One of the main goals of a national library is fulfilling their nation's part of the common international goal of universal bibliographic control. The International bibliographic control is done by the exchanges and also by fostering the creation of standard conceptual tools such as library classification systems and cataloguing rules. The most commonly used of these tools is the International Standard Bibliographic Description (ISBD). It applies to books and periodicals, but also has variants for other book-like material such as the ISBD (ER) for Electronic Resources or digital documents or the ISBD (A) for Antiquarian documents.
C) Conclusion: New ideas are generated in each and every branch of human activity from time to time. Apart from new ideas we give new interpretation to old ideas, at times we also borrow ideas from other discipline and try to apply them in a new content. As a result more and more information are produced in a variety of forms leading to information explosion. There is a need to keep track of this information explosion by way of bibliographic control.