Models of
Information
Retrieval
(Cognitive
model)
Md. Firdaus
MLIS 2nd Year
Pondicherry University
Introduction






By information model is meant those activities
a person may engage in when identifying
their own nee...
Ellis Model
 Ellis's

elaboration of the different behaviors
involved in information seeking .
 he uses the term 'featur...
Cont…







Starting: the means employed by the user to
begin seeking information, for
example, asking some knowledge...
…
 Monitoring:

Cont

keeping up-to-date or current
awareness searching;
 Extracting: selectively identifying relevant
m...
Figure
Bates Model
 There

are four layer of this model.
 1st layer: Infrastructure
 2nd layer: content combine with the
metad...
Ingwersen's cognitive model




From the perspective of the interaction of
users with IR systems. Ingwersen's cognitive
...
Figure
Cont….




He shows that various cognitive transformations
take place in moving from the life-world in which
the user ex...
Conclusion
 Most

of the model discussed based on
user information seeking behavior.
 On the basis of such kinds of mode...
Cognitive Retrieval Model
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Cognitive Retrieval Model

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Cognitive Retrieval Model

  1. 1. Models of Information Retrieval (Cognitive model) Md. Firdaus MLIS 2nd Year Pondicherry University
  2. 2. Introduction    By information model is meant those activities a person may engage in when identifying their own needs for information, Searching for such information in any way, and using or transferring that information. A model may be described as a framework for thinking about a problem and may evolve into a statement of the relationships among theoretical propositions.
  3. 3. Ellis Model  Ellis's elaboration of the different behaviors involved in information seeking .  he uses the term 'features' rather than 'stages'. These features are named and defined below:
  4. 4. Cont…     Starting: the means employed by the user to begin seeking information, for example, asking some knowledgeable colleague; Chaining: following footnotes and citations in known material or 'forward‘ chaining from known items through citation indexes; Browsing: 'semi-directed or semi-structured searching' . Differentiating: using known differences in information sources as a way of filtering the amount of information obtained.
  5. 5. …  Monitoring: Cont keeping up-to-date or current awareness searching;  Extracting: selectively identifying relevant material in an information source;  Verifying: checking the accuracy of information;  Ending: which may be defined as 'tying up loose ends' through a final search.
  6. 6. Figure
  7. 7. Bates Model  There are four layer of this model.  1st layer: Infrastructure  2nd layer: content combine with the metadata structure.  3rd layer: information retrieval system  4th layer: human part of system(user searching activities)
  8. 8. Ingwersen's cognitive model   From the perspective of the interaction of users with IR systems. Ingwersen's cognitive model which '...concentrates on identifying processes of cognition which may occur in all the information processing elements involved. Ingwersen brings the IR system into the picture, suggesting that a comprehensive model of information-seeking behaviour must include the system that points to the information objects that may be of interest to the enquirer.
  9. 9. Figure
  10. 10. Cont….   He shows that various cognitive transformations take place in moving from the life-world in which the user experiences a problem or identifies a goal to a situation in which a store of pointers to information objects can be satisfactorily searched and useful objects identified. Finally he points to the need for these models or cognitive structures and their transformations to be effectively communicated throughout the 'system', which will include the user, the author and the IR system designer.
  11. 11. Conclusion  Most of the model discussed based on user information seeking behavior.  On the basis of such kinds of model , libraries are developed IRS, where user are supposed to access and use information without direct involvement of any human intermediary .
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