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Chain indexing

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1. 1. CHAIN INDEXING Presented by Ezhilan
2. 2. Introduction • Indexing has to specify exactly the content of documents. This needs a language by which the contents could be described precisely (i.e. Indexing Language). • Indexing includes : a) Conceptual Analysis, and b) Representation (of the Contents)
3. 3. Types of Indexing Techniques : There are broadly two types of Indexing Techniques or Indexing Methods. They are : a) Pre-Coordinate Indexing, and b) Post-Coordinate Indexing. Pre-Coordinate Indexing Systems : It means the key works are Co ordinated at the time of indexing. ( PRECIS, POPSI and chain indexing) Post-Coordinate Indexing Systems: It means the key works are Co ordinated at the time of searching. Ex. Uniterm indexing.
4. 4. Chain Indexing • Dr. S. R. Ranganathan developed a method of indexing, called chain procedure of subject indexing or simply Chain Indexing. It is a method of deriving alphabetical subject entries from the chain of successive subdivisions of subjects needed to be indexed leading from general to specific level. •
5. 5. Definition • According to Ranganathan,chain indexing is a “procedure for deriving class index entry (i.e. subject indexentry) which refers from a class to its class number in a more or less mechanical way.”
6. 6. The basic steps in chain indexing are enumerated below: • a).Classify the subject of a document by following a preferred classification scheme. • b) Represent the class number in the form of a chain in which each link consists of two parts: class number and its verbal translation in standard term or phrase used in the preferred classification scheme.
7. 7. Cont…. • c) Determine different kinds of links: sought, unsought, false and missing links. • d) Derive specific subject heading for the specific subject entry from the last sought link and moving upwards by taking the necessary and sufficient sought links in a reverse rendering or backward rendering process.
8. 8. Cont… • e) Derive subject reference heading for the subject reference from each of the upper sought links. • g) Prepare ‘see’ references for each alternative and synonymous term used in the specific as well as subject reference headings.
9. 9. Cont… • h) Merge specific subject entries, subject references (i.e. ‘See also’ references) and ‘See’ references and arrange them in single alphabetical sequence.
10. 10. Thank you.
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