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Knowledge organisation: classifications, and thesaurus systems

****. Knowledge organisation: classifications, and thesaurus systems. Introduction. ***-. Knowledge organisation: introduction.

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Knowledge organisation: classifications, and thesaurus systems

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  1. **** Knowledge organisation: classifications, and thesaurus systems Introduction

  2. ***- Knowledge organisation: introduction • To organise knowledge / documents / books / reports / information / data / records / things / items / materials for more efficient storage and retrieval, some related, similar tools / systems / methods /approaches are used. • Often but not yet always, this process is assisted by a computer system. • Good systems are expanded and updated when the need arises. • The organization system applied should ideally be clearly and immediately visible or even searchable on computer, by the user of the materials.

  3. ***- Knowledge organisation: some tools • Various tools / systems / methods / approaches are available: • Classification • Taxonomy • Thesaurus • Ontology • …

  4. **** Knowledge organisation: classifications, and thesaurus systems Classifications

  5. 5 **-- !? Question !? Task !? Problem !? Give examples of general, universal classification systems.

  6. ***-Examples Classification systems: introduction • Classification systems present the subjects in a logical order, usually going from the more general to the more specific.

  7. ***-Examples Classification systems: examples of universal systems • Universal means here: covering all subjects • Not just one but several competing systems exist. Examples • Universal Decimal Classification = UDC used mainly outside U.S.A. • Dewey Decimal Classification = DDC used mainly in U.S.A. • Library of Congress Classification used mainly in U.S.A. • ...

  8. **** Knowledge organisation: classifications, and thesaurus systems Thesaurus systems

  9. **** Thesaurus: description • Thesaurus (contents) = • system to control a vocabulary (= words and phrases + their relations) • the contents of this vocabulary • Thesaurus program = program to create, manage, modify and/or search a thesaurus using a computer

  10. **** Thesaurus relations Term(s) with broader meaning BT (= Broader Term) RT (= Related Term) UF (= Use(d) For) Other term(s) TermSynonym(s) NT (= Narrower Term) Term(s) with narrower meaning

  11. 11 ***- !? Question !? Task !? Problem !? Which applications do you see for a thesaurus?

  12. ***- Thesaurus applications • To find/choose index terms to add these to items in a database, when terms are taken from a controlled vocabulary. • To find more and/or better terms to search a database (to increase recall and precision)! • To find more and/or better terms during writing. • To understand the meaning of a term, by inspecting • the scope note of the term and/or • the relations with other terms.

  13. 13 **-- !? Question !? Task !? Problem !? Which thesauri do you know?

  14. ***-Examples Thesaurus systems covering all subjects: examples • General systems / universal systems / on all subjects = broad and shallow, horizontal systems • Examples: • thesaurus systems built into word processing software • Library of Congress Subject Headings (LCSH) • ... • An ideal, complete thesaurus covering all subjects does not exist.

  15. **** !? Question !? Task !? Problem !? Try to find suitable search terms to retrieve documents on “pollution”from a database on marine science, by using for instance the thesaurus included in the program for word processing that you use.

  16. ***-Examples Thesaurus systems focused on a particular subject: examples • Focused on a particular subject domain = narrow and deep, vertical systems • Examples: the thesaurus for • the Aquatic Sciences and Fisheries Information System • ERIC: education, information science,... • INSPEC: physics, electronics, information technology • Medline (the Medical Subject Headings = MeSH) • PsychologicalAbstracts/ PsycInfo • Sociological Abstracts / SocioFile;...

  17. **** Knowledge organisation: classifications, and thesaurus systems Classification systems versus thesaurus systems

  18. **** Knowledge organization:classifications versus thesauri • Classification • Good for placement of documents in a library (because documents on many related subjects can be kept together) • Not well suited for computer searching (too complicated) • Thesaurus • Not suited for placement of documents in a library (because documents with related subjects would NOT be kept together) • Well suited for computer searching (relatively simple alphabetic listing of keywords)

  19. 19 ***- !? Question !? Task !? Problem !? Use the Aquatic Sciences and Fisheries Thesaurusto find the appropriate terms to retrieve items about “fishing with dynamite” from the database of the Aquatic Science and Fisheries Information System.

  20. 20 ***- !? Question !? Task !? Problem !? Use the Aquatic Sciences and Fisheries Thesaurusto formulate a query to find general reviews about monitoring of sea pollution, in the database of the Aquatic Science and Fisheries Information System.

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