Post-coordinate indexing model, Humanities

Assignment Help:

POST-COORDINATE INDEXING MODEL 

All the pre-coordinate indexing models discussed so far are of unidimensional in nature based on the order of significance. The significance order is again based on the syntactical rules of the given pre-coordinate  indexing model. Rigidity of significance order may not meet the approaches of all users with a particular pattern of coordination, even with permutations. Therefore, the need was felt for a multidimensional system to permit access to subjects from any point of view. The alternative naturally was to prepare an index, where the subject concepts will be  kept separately  uncoordinated by the indexer. Coordination of concepts could be done  at the time  of search. It should be  noted that the process of coordination of concepts exists in both the pre-and post-coordinate indexing models, but it is done at two different stages. The indexing system which has the ability to freely coordinate terms  at the  time of search, thereby providing an unlimited number of access points to a document belongs to the post-coordinate or coordinate indexing models. 

Broadly, there are two types of post-coordinate indexing systems -Term Entry System and Item Entry System. In the Term Entry System, index entries are made for a document under each of the appropriate terms and are arranged in alphabetical sequence. A card catalogue using unit cards is of this kind. In this system, the number of index entries for a document is dependent on the number of terms representing the content of the document. Here terms are posted on the item. Uniterm Indexing and Optical Coincidence Card are examples of Term Entry System. Item Entry System takes the opposite approach and makes a single index entry for each document, using a physical form which permits access to the entry from all appropriate terms. Here, items are posted on the term. Edge-Notched Card or Punched Card System is the best example of item entry system. 

Most important features of the post-coordinate indexing system  are : (a) No  sequence of terms or citation order is necessary. Every term gets equal weight; (b) constituent concepts of a composite subject are kept separately uncoordinated by the indexer and the coordination of concepts is done by the searcher at the search stage; (c) The searcher has wide options of the free manipulation of the classes at the time of searching. As a result, the searcher has the complete freedom to coordinate the index terms in any combination or order required; (d) Multidimensionality in relationships of concepts can be retained. 

Post-coordinate indexing system was first conceived by Mortimer Taube in 1953 as a means of organising the research reports acquired by the US Armed Services Technical Information Agency. This indexing system became  very  popular due to its simplicity. Taube's system was based upon "uniterm cards", a card-based system. The principles of this system have been adapted and further evolved in computer-based bibliographic information retrieval systems. When Taube conceived the system, it was based on unit term. Soon he changed the idea of unit term to unit concept.  


Related Discussions:- Post-coordinate indexing model

Role of computers in library, ROLE OF COMPUTERS As you are aware, the ...

ROLE OF COMPUTERS As you are aware, the introduction of computers in the libraries has brought about sea-change in the various services provided by modern libraries. The use

Foundation course in science and technology, discuss briefly the scientific...

discuss briefly the scientific and technical achievements of bronze age

Evaluation of dictionaries, Evaluation of Dictionaries In this section...

Evaluation of Dictionaries In this section, we will touch upon some evaluation criteria which are useful for you in assessing the value of any dictionary you intend to acquire

Wellness and lifestyle analysis, Wellness and Lifestyle Analysis- Wellness ...

Wellness and Lifestyle Analysis- Wellness is a condition of most favorable well-being i.e. oriented toward maximizing potential of an individual. It is a life-long process of movin

Main entry, Why is it necessary to call the entries main and added?

Why is it necessary to call the entries main and added?

What is the method used to solve an ethical problem, What is the method use...

What is the method used to solve an Ethical problem?  Recognizing a problem or its requirements. Gathering information and explaining the problem to be solved or goal to be ach

Aacr-2r - rules for choice of heading, AACR-2R   In AACR-2R under 'Choi...

AACR-2R   In AACR-2R under 'Choice of Name' there are 19 rules of which four are about pseudonyms. Since pseudonyms are dealt with in Unit 12, we will leave these four rules fr

The significance of the bronze age, In terms of technological but also soci...

In terms of technological but also social development, what do you think was the significance of the Bronze Age?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd