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Controlled terms used to describe and index content by topic in catalogs, databases, and repositories.
DESCRIPTION
Subject headings are standardized terms assigned to works to represent their topics, enabling consistent retrieval and browsing. They form part of controlled vocabularies and taxonomies, such as LCSH. Catalogers and information professionals maintain headings to reduce ambiguity and improve search precision. Mappings, synonyms, and hierarchical relations support navigation and discovery. Modern systems integrate subject headings with tags, facets, and ontologies for richer information access.
ALTERNATIVE DEFINITIONS
Wikipedia
Library of Congress Subject Headings (LCSH) is a controlled vocabulary used for subject indexing.
Identifies subject headings as controlled terms used in library indexing.
Library of Congress
Subject Headings are controlled terms maintained by the Library of Congress for describing the topical content of resources.
Emphasizes authority control and topical description in a national standard.
RELATED TERMS
Value Set Class Hierarchy Thesaurus Library of Congress Subject Headings Indexing Metadata Cataloging Descriptor Subject Indexing Classification Authority Control
COMPETING TERMS
KNOWLEDGE AREAS
Semantic & Knowledge Modeling Document & Content Management Metadata Management
TARGET AUDIENCE
Information Analyst Data Steward BI Specialist Data Modeler Data Architect
EXTERNAL SOURCES
- Wikipedia - Library of Congress Subject Headings
- Library of Congress - Official LCSH authority service
- Library of Congress - Subject cataloging policies and resources
TOP QUESTIONS
Why use Subject Headings rather than free-text keywords?
Subject headings provide controlled, consistent descriptors that improve precision and reduce ambiguity compared to ad hoc keywords.
Category: Relevancy
How are Subject Headings maintained?
Through authority control, editorial review, and updates by governing bodies like the Library of Congress.
Category: Management
What is a common mistake with Subject Headings?
Assigning overly broad headings that obscure specificity. Choose the most precise headings supported by policy.
Category: Mistakes
How do Subject Headings support discovery?
They standardize topical access, enabling effective faceted search, browsing, and linking across catalogs.
Category: Impact
Can Subject Headings coexist with Tagging?
Yes. Use headings for authoritative indexing and tags for user-generated signals to enrich discovery.
Category: Opinion
What are examples of Subject Heading systems?
Library of Congress Subject Headings, Medical Subject Headings, and various domain thesauri.
Category: Example
How are Subject Headings chosen for a record?
Indexers analyze content, consult policies, select headings that best represent the resource’s aboutness.
Category: Application
What risks arise from incorrect Subject Headings?
Misleading discovery, poor user satisfaction, and compromised analytics based on topical facets.
Category: Risk
What standards relate to Subject Headings?
ISO 25964 for thesauri and W3C SKOS for modeling controlled vocabularies and publishing them as linked data.
Category: Standard