Introduction In library classification and knowledge organization, the Principle of Context Dependency is an important concept. It highlights how the meaning and classification of a subject can depend on the context in which it appears. This principle is especially important in faceted classification systems, such as Colon Classification developed by Dr. S. R. Ranganathan. What […]
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Introduction A library catalogue is a tool used to list and describe all the materials held by a library. It helps users find books and other resources by providing bibliographic details like title, author, subject, and classification number. The inner form of a library catalogue refers to the physical or digital structure used to present
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Introduction In library classification, notation refers to the system of symbols (such as numbers, letters, or a combination) used to represent subjects. It is a coded form that helps classify, arrange, and locate books or other materials on the library shelves. A good notation makes the classification system effective and user-friendly. Qualities of Notation For
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Introduction OPAC stands for Online Public Access Catalogue. It is a computerized system used by libraries to provide users access to the library’s collection through a computer or internet-connected device. OPAC replaces the traditional card catalogue and provides a modern, user-friendly, and efficient way to search for books, journals, and other library resources. Features of
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Introduction MARC stands for Machine-Readable Cataloging. It is a standard format developed to allow bibliographic information to be read and interpreted by computers. MARC records are used globally by libraries to share, store, and manage cataloging data electronically. The current and most widely used version is MARC 21. What is a MARC Record? A MARC
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Introduction In library classification, a clear and logical structure is essential for organizing knowledge. Canons for arrays are guiding principles that ensure subjects at the same level in a classification schedule are arranged meaningfully. These canons are particularly emphasized in faceted classification systems like Colon Classification, developed by Dr. S. R. Ranganathan, where precision and
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Introduction The Dewey Decimal Classification (DDC) system is one of the most widely used methods for classifying library materials. Traditionally available in print, it is now also available in a digital format known as the electronic version of DDC or WebDewey. The electronic version enhances access, usability, and efficiency in library cataloguing and classification tasks.
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Introduction The Anglo-American Cataloguing Rules, Second Edition, Revised (AACR-2R) is a widely used set of cataloguing rules for library materials. While it is commonly associated with cataloguing books, AACR-2R also provides detailed guidelines for cataloguing non-book materials such as maps, audiovisual resources, electronic resources, and microforms. These rules help maintain uniformity and consistency in the
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Introduction This post includes all the answers for the IGNOU assignment BLI-222: Information Sources and Services for the July 2025 and January 2026 sessions. Each answer is written in simple and easy-to-understand language, suitable for students of all backgrounds. The answers follow IGNOU’s assignment guidelines and cover key topics from Units 1 to 14. Assignment
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Introduction Mass media refers to the communication platforms used to reach a large audience. These include television, radio, newspapers, the internet, and social media. While mass media has many positive effects—such as spreading information and raising awareness—it also has some negative influences that affect individuals and society in various ways. Negative Influences of Mass Media
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