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Classified Index• is arranged in hierarchy of related  topics and working down to the  specific.
Advantages conceptually an aid to search.Make searching simple if the users wants to conduct generic searches; since the...
Disadvantage• A secondary file, an alphabetical list, is  necessary, so that a search will generally  require two-step pro...
ExamplesEngineering Index. New York:EngineeringInformation. Inc., 1884- .Index Medicus. Bethesda,Md.:National Libraryof Me...
Coordinate Indexare created by combining two or more single index terms to create a new class.
For example , if the Individual index terms“Black,” “Polecats,” and “Texas” are combined, the result is distinctive class:...
A classic example of coordinate index is the marginal –hole punched card system.Index terms were presented by notching o...
Marginal-hole punched cardCats        Dogs Cows       Birdboy, Samel W.       Cats and Cows. Journal of Animals, v.2 (Oct....
 To Search this type of coordinate index, a needle was  inserted through a file of cards at the desired position  (e.g., ...
 Coordinate indexing was a natural consequence  of the application of the punch-card techniques  to information retrieval...
Classified and coordinate indexes clydee
Classified and coordinate indexes clydee
Classified and coordinate indexes clydee
Classified and coordinate indexes clydee
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Classified and coordinate indexes clydee

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Classified and coordinate indexes clydee

  1. 1. Classified Index• is arranged in hierarchy of related topics and working down to the specific.
  2. 2. Advantages conceptually an aid to search.Make searching simple if the users wants to conduct generic searches; since the hierarchy is visually presented.
  3. 3. Disadvantage• A secondary file, an alphabetical list, is necessary, so that a search will generally require two-step procedure of going to the alphabetical list to identify the right position in the classified list.
  4. 4. ExamplesEngineering Index. New York:EngineeringInformation. Inc., 1884- .Index Medicus. Bethesda,Md.:National Libraryof Medicine, 1960- .Index to Theses Accepted for Higher Degreesin the Universities of Great Britain and Ireland. London: AsLib, 1953-.
  5. 5. Coordinate Indexare created by combining two or more single index terms to create a new class.
  6. 6. For example , if the Individual index terms“Black,” “Polecats,” and “Texas” are combined, the result is distinctive class: “Black Polecats of Texas”
  7. 7. A classic example of coordinate index is the marginal –hole punched card system.Index terms were presented by notching out holes in known positions around the card
  8. 8. Marginal-hole punched cardCats Dogs Cows Birdboy, Samel W. Cats and Cows. Journal of Animals, v.2 (Oct. 1990, 1-3)
  9. 9.  To Search this type of coordinate index, a needle was inserted through a file of cards at the desired position (e.g., “Cats” and “Dogs”) and the card were shaken so that the notched cards would fall. In this case all cards with notches for cats and dogs would drop out, thus identifying the papers that were indexed under two terms
  10. 10.  Coordinate indexing was a natural consequence of the application of the punch-card techniques to information retrieval,since the presence or absence of a hole in a card can represent a binary indication of a specific bit of in information.

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