Library Science Cheat Sheet

The core ideas of Library Science distilled into a single, scannable reference — perfect for review or quick lookup.

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Quick Reference

Classification Systems

Systematic schemes for organizing materials by subject, such as the Dewey Decimal Classification (DDC) and the Library of Congress Classification (LCC). These systems assign notation to subjects so that related items are shelved together and can be located predictably.

Cataloging and Metadata

The process of creating structured descriptions of information resources so they can be discovered, identified, and accessed. Modern cataloging follows standards such as Resource Description and Access (RDA) and uses metadata schemas like MARC, Dublin Core, and MODS.

Information Retrieval

The science of searching for and extracting relevant information from large collections of data. It encompasses query formulation, indexing, relevance ranking, Boolean logic, and natural language processing techniques used in library catalogs, databases, and search engines.

Reference Services

The direct assistance provided by librarians to users seeking information, including answering factual questions, guiding research strategies, conducting literature searches, and teaching users how to evaluate and use information sources effectively.

Collection Development

The systematic process of building and maintaining a library's holdings to meet the informational needs of its community. It involves selecting, acquiring, evaluating, and weeding materials across all formats based on established policies.

Information Literacy

The set of competencies required to recognize when information is needed and to locate, evaluate, and use it effectively and ethically. Information literacy instruction is a core function of academic and school libraries.

Digital Preservation

The active management of digital content over time to ensure ongoing access despite technological obsolescence. It includes strategies such as format migration, emulation, checksum verification, and adherence to standards like OAIS (Open Archival Information System).

Controlled Vocabulary

A standardized set of terms used to index and retrieve information consistently. Examples include the Library of Congress Subject Headings (LCSH) and Medical Subject Headings (MeSH), which ensure that the same concept is always described with the same term.

Intellectual Freedom

The principle that all people have the right to seek, receive, and impart information and ideas through any media without restriction. Libraries champion intellectual freedom through policies opposing censorship and protecting patron privacy.

Ranganathan's Five Laws of Library Science

Five foundational principles articulated by S.R. Ranganathan in 1931: (1) Books are for use, (2) Every reader his or her book, (3) Every book its reader, (4) Save the time of the reader, and (5) The library is a growing organism. These laws continue to guide library philosophy and service design.

Key Terms at a Glance

Acquisitions:The process of obtaining materials for a library collection through purchase, gift, exchange, or licensing.

Authority Control:The maintenance of consistent and standardized headings for names, subjects, and titles in library catalogs.

Boolean Operators:Logical connectors (AND, OR, NOT) used in database searching to combine, expand, or exclude search terms.

Call Number:A unique identifier assigned to an item in a library that indicates its location on the shelf, typically based on a classification system.

Cataloging:The process of creating bibliographic records that describe library materials and provide access points for discovery.

Circulation:The lending and return of library materials to and from patrons, including tracking due dates, holds, and overdue items.

Classification:A systematic arrangement of materials by subject using a standardized scheme such as DDC or LCC.

Collection Development:The strategic process of building and maintaining library holdings to serve the needs of the user community.

Controlled Vocabulary:A curated list of standardized terms used to consistently index and retrieve information resources.

Digital Preservation:The set of strategies for maintaining long-term access to digital objects in the face of technological change.

Dublin Core:A simple metadata standard consisting of 15 core elements used to describe digital resources across domains.

FRBR:Functional Requirements for Bibliographic Records, a conceptual model identifying entities of Work, Expression, Manifestation, and Item.

Indexing:The process of assigning subject terms or descriptors to documents to facilitate retrieval.

Information Literacy:The ability to recognize information needs and to find, evaluate, and use information effectively and ethically.

Integrated Library System (ILS):Software for managing library operations including cataloging, circulation, acquisitions, and serials.

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