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The purpose of authority control is to ensure consistency in representing a value - a name of a person, a place name, or a term or code representing a subject - in the elements used as access points in information retrieval. The primary purpose of this study is to produce a framework that will provide a clearly stated and commonly shared understanding of what the subject authority data/record/file aims to provide information about, and the expectation of what such data should achieve in terms of answering user needs.

Alphabetical cataloguing --- FRSAD (Conceptual model) --- Subject Headings. --- Subject headings. --- Controlled vocabularies (Subject headings) --- Headings, Subject --- Indexing vocabularies --- Lists of subject headings --- Structured vocabularies (Subject headings) --- Subject authorities (Information retrieval) --- Subject authority files (Information retrieval) --- Subject authority records (Information retrieval) --- Subject heading lists --- Subject headings, English --- Vocabularies, Controlled (Subject headings) --- Vocabularies, Structured (Subject headings) --- Thesauri (Controlled vocabularies) --- Authority files (Information retrieval) --- Subject cataloging --- FRSAR (Conceptual model) --- Functional Requirements for Subject Authority Data (Conceptual model) --- Functional Requirements for Subject Authority Records (Conceptual model) --- Entity-relationship modeling --- Subject headings

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Using Subject Headings for Online Retrieval is an indispensable tool for online system designers who are grappling with developing new systems or refining existing ones. This ready reference describes subject analysis and subject searching in online catalogs, including the limitations of retrieval, and demonstrates how such limitations can be overcome through system design and programming. The practical reference also describes the Library of Congress Subject Headings (LCSH) system and system characteristics; it shows how information is stored in machine-readable files; and it offers examples of and recommendations for successful retrieval methods. Tables are included to support these recommendations, and diagrams, graphs, and bar charts are used to provide results of data analysis. Practitioners in institutions using or considering the installation of an online catalog will continuously consult this book to generate specifications. The book also appeals to researchers in library systems, information retrieval, and user behavior because it details the results of an extensive, empirical study of the subject terms entered into online systems by end users. It also addresses the needs of advanced students in library schools and instructors in library automation, information retrieval, cataloging, indexing, and user behavior. It overviews the LCSH system and system characteristics. It describes how information is stored in machine-readable files. It offers examples of and recommendations for successful retrieval methods. Empirical evidence supports recommendations.

Information retrieval --- Library automation --- Subject indexing --- Bibliografische opzoekingen [Online ] --- Bibliographic searching [Online ] --- Information en ligne --- On-line bibliographic searching --- Onderwerpsontsluiting --- Onderwerpswoorden --- Online bibliografische opzoekingen --- Online bibliographic searching --- RDAO --- RDI --- RIAO --- Recherche bibliographique en ligne --- Recherche d'information assistée par ordinateur --- Recherche documentaire assistée par ordinateur --- Recherche documentaire automatisée --- Recherche documentaire en ligne --- Recherche documentaire informatisée --- Subject headings --- Trefwoorden --- Télématique documentaire --- Vedettes-matière --- 025.43 --- Online library catalogs --- -Controlled vocabularies (Subject headings) --- Headings, Subject --- Indexing vocabularies --- Lists of subject headings --- Structured vocabularies (Subject headings) --- Subject authorities (Information retrieval) --- Subject authority files (Information retrieval) --- Subject authority records (Information retrieval) --- Subject heading lists --- Subject headings, English --- Vocabularies, Controlled (Subject headings) --- Vocabularies, Structured (Subject headings) --- Thesauri (Controlled vocabularies) --- Authority files (Information retrieval) --- Subject cataloging --- FRSAD (Conceptual model) --- Electronic information resource searching --- Searching, Bibliographical --- 025.43 Trefwoordensystemen. Thesauri. Descriptorlijsten --- Trefwoordensystemen. Thesauri. Descriptorlijsten --- Catalogs, On-line --- Library online catalogs --- On-line catalogs (Libraries) --- Online catalogs --- Online public access catalogs (Libraries) --- OPACs (Libraries) --- Library catalogs --- Online information services --- Subject access --- Recherche documentaire automatisée --- Vedettes-matière --- Subject access. --- Controlled vocabularies (Subject headings) --- Subject access in online library catalogs --- Subject retrieval in online library catalogs --- Information storage and retrieval systems --- Online bibliographic searching. --- Subject headings.