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An introduction to assigning subject descriptors to an information object, including subject headings (LCSH, Sears) and other controlled vocabularies like thesauri (Getty AAT).
Citation preview
Subject Analysis
LIS 653
Starr Hoffman
How it All Fits Together
Record(representation of bibliographic
information)
Code (rules:
AACR2, RDA)
Encoding (MARC, XML)
Authority control (standardized author name: J. R. R. Tolkien)
Structure (ISBD, XML)
Subject headings (LCSH, Sears,
AAT)
Classification (shelving: LC,
Dewey)
Model (FRBR, trad.
model)
Record is displayed in an OPAC, online database, etc.
Format(MARC,
Dublin Core)
Goals of Subject Analysis
Collocation of similar items: On the shelf
Classification In the catalog
Subject headings
Goals of Subject Analysis
Collocation of similar items: On the shelf
Classification In the catalog
Subject headings
Enable high precision & recall Precision: most of the results are relevant Recall: most of the relevant items are retrieved
Find all items in a library on a given topic
Subject Analysis Strategies
Classification Dewey Decimal Classification Library of Congress Classification
Subject Headings & Thesauri (controlled vocabularies)
Subject Headings (general) Library of Congress Subject Headings (LCSH) Sears List of Subject Headings
Thesaurus (specific subject domain) Art & Architecture Thesaurus (AAT) Legislative Indexing Vocabulary (LIV)
1 topic per item
multiple topics
per item
Subject Analysis Strategies
Classification
Subject Headings (5, LCSH)
1 topic per item
multiple topics
per item
Controlled Vocabularies: Guiding Principles
Basis for including terms in a vocabulary:
Literary warrant Is this term used in the literature of the topic?
In art literature (AAT): “iconography” LCSH “lit” = all books held by Library of Congress
Use warrant Principle of common usage (Cutter)
“cat” vs. “feline” Terms useful for your users
Structural warrant Supply missing links in a hierarchy
Controlled Vocabularies: Guiding Principles (LCSH)
Literary warrant Is this book held by Library of Congress?
User needs (access, current usage) Uniform headings, unique headings
One heading per subject… Bank (Financial institution) Bank (River)
Specific & direct entry Use the most specific term
Stability Weigh change against impact (users, catalogers) & cost
Consistency Form & structure
Controlled Vocabularies:
FAST (Faceted Application of Subject Terminology)
Controlled Vocabularies…
Precoordinate: Keywords are combined (LCSH, Sears)
LCSH: Plants--Nutrition--Genetic Aspects Sears: Salt in animal nutrition
Postcoordinate: Keywords/concepts are not combined (most thesauri)
Example: Plants Nutrition Genetics Salt
Term Mapping in Controlled Vocabularies
BT = broader term NT = narrower term RT = related term UF = used for
lists non-preferred headings USE = gives a preferred
heading SA = see also
lists potentially related or similar headings
Challenges in Subject Analysis
Complex subjects Comparing Methods in Sociological Research in Panama, Peru, and Spain
Differences in cultural background Consistency Non-textual items Exhaustivity: What level?
precision vs. recall
Objectivity bias, beliefs
Different Methods of Subject Analysis
Langridge What is it? (category of knowledge) What is it for? What is it about?
Wilson’s methods Purposive method Figure-ground method Objective method Cohesion method
Use-based approach What is it about? Why has it been added to our collection? What aspects will our users be interested in?
Different Methods of Subject Analysis
Combine & improvise as-needed…
Starr’s Method: What is it?
category of knowledge physical format, genre
What is it for? Who is it for?
Who was it created for? Which of our local user groups will use it?
What is it about? Why has it been added to our collection?
child reading Percy
Jackson
literature professor
Process of Conceptual Analysis
Examine the item Bibliographic features Visual elements
Examine the content Topics mentioned Names as subjects Chronological elements
Content characteristics Language, tone Intellectual level, audience Point of view Research methods Form and genre
But in the end…There’s no one correct method.
Happy Halloween!