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Are LCSH still effective?

Are LCSH still effective?. Why not use keyword searching instead?. Presented by Carol Bradsher October 29, 2004. Problems. What are the problems with subject analysis in general and the Library of Congress Subject Headings, specifically?. Survey says….

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Are LCSH still effective?

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  1. Are LCSH still effective? Why not use keyword searching instead? Presented by Carol Bradsher October 29, 2004

  2. Problems • What are the problems with subject analysis in general and the Library of Congress Subject Headings, specifically?

  3. Survey says… • Complexity, which impacts ability of catalogers to assign and general public to use • 75% of users do not understand; • 50% of librarians don’t either; • No guidance on determining “aboutness” • Inconsistency of heading assignment, influenced by subjectivity, cultural biases, differing perspectives of catalogers

  4. Aboutness… • Assigning subject headings is an art, not a science • Cataloging standards favor the known item

  5. This boils down to… • Subject search is the most widely used (50% of catalog searches are subject searches) and the most frustrating one for information seekers WHAT THE HELL DO YOU MEAN NO MATCH FOUND?

  6. Discussion point • What are the advantages of controlled vocabulary? • Advantages of keyword searching? • Disadvantages of keyword?

  7. Advantages of controlled vocabulary • Can handle variations in language and terminology • Synonyms • Homographs • Can combine terms into phrases, relate phrases to one another • Cross reference structure to direct users to valid terms

  8. Advantages of keyword • Greater recall • Requires less knowledge to search • Can access entire bibliographic record, table of contents, summary • pre-coordinate indexing vs. post-coordinate, which allows multiple headings to be accessed (Dancers AND Musicians)

  9. Disadvantages of keyword Success of keyword searching depends on 2 assumptions: • Authors writing about the same concepts will use the same words in their writings; • Searchers will be able to guess what words those authors used for the concepts

  10. Language—the biggest obstacle for keyword searching • Synonyms • Homographs • Determining the meaning of words

  11. Synonyms • Words can have the same meaning, or not, e.g. • Attire, dress, clothing • Various styles of dress • She is wearing a lovely dress

  12. Synonyms • Singular vs. plural form doesn’t always have the same meaning • Apple (fruit and/or tree) • Apples (fruit only) • Art (visual art) • Arts (various subdisciplines including visual, literature, performing)

  13. What about synonym lists? • not large or general enough • Implemented in small and specialized domains • No knowledge of adjectives and nouns and which kind of words could be used together to make a phrase • Aircraft = planes • Big = large • Big aircraft = large planes

  14. Homographs • Words that look the same but have different meanings: • Mercury: liquid metal, planet, car, Roman God or Freddie • Bridge: structure, dental device, card game, musical conveyance

  15. Keyword’s biggest weakness • “Subject analysis so far has defied automatic techniques such as word counting; only a human can attach words to a concept that is the subject of a document but is never explicitly named in that document.” -- Arlene Taylor

  16. What’s the solution? • Disadvantages to both controlled vocabulary and keyword, what do we do? • Throw out LCSH • Throw out keyword • Start over?

  17. Suggested solutions • Hildreth: keep LCSH, change automated systems so they search more intelligently

  18. Index worthy books • Paul Frantz: expand scope of EGLI and use it to address content of nonfiction books contained in the Book Review Digest (ca. 5000 titles) • Could be accomplished by 3 or 4 catalogers doing 7-8 books per day

  19. Standardize order of subdivisions in LCSH • Study by Karen Drabenstott (1998) on understanding subject headings • Endorses recommendation of Subject Subdivision conference (1991) • Simplify cataloging and save money • No training needed on the ordering of subdivisions • Staff time saved in verification • Makes machine verification of headings possible

  20. FAST • OCLC research project, Faceted Application of Subject Terminology • Derived from LCSH, but simpler syntax • Intended audience: web resources

  21. FAST background • Response to an ALCTS subcommittee recommendation for subject analysis of web resources • Built on LCSH to take advantage of: • Existing schema with strong history and LC support • rich terminology • Extensive use • Post-coordinate searching • Dogs AND Housing

  22. Mechanics 6 facets at this point: • Topical (includes topical subdivisions) • Geographic • Form • Period • Personal name • Corporate name (rest to be added later)

  23. New rules • Everybody in the pool! • All topical headings and their subdivisions in the Authority File as strings • West Side Story for subdivisions • stick with your own kind, topical headings subdivided by topical sbd, geographic headings by geographic sbd, etc. • Back to the future • Geographic headings formulated in indirect order, e.g. Ohio—Columbus; Ohio—Columbus—German Village

  24. LCSH: 650 Authority files (Information retrieval) $z Italy $z Florence $v Congresses FAST: Topical: Authority file (Information retrieval) Geographic: Italy $z Florence Form: Congresses examples

  25. Summary • What’s our purpose today?

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