The document discusses information retrieval systems. It defines information retrieval as the process of searching collections of documents to identify those dealing with a particular subject. Information retrieval systems aim to facilitate literature searching. They involve representing, storing, organizing, and providing access to information items so that users can easily find information of interest. Information retrieval draws from multiple disciplines and involves subsystems for documents, users, and searching/matching.

1. By
N.Silambarasi
Dept of LIS
Pondicherry University

2.  The Information Retrieval System was coined
by Calvin Mooers in 1952.
 These information retrieval systems were,
truly speaking, document retrieval system,
since they were designed to retrieve
information.
 Information retrieval deals with storage,
organization and access to text, as well as
multimedia information resources.

3.  Information retrieval is the process of
searching some collection of documents, using
the term document in its widest sense, in order
to identify those documents which deal with a
particular subject. Any system that is designed
to facilitate this literature searching may
legitimately be called an information retrieval
system.

4.  Information Retrieval (IR) deals with the
representation, storage, organization of, and
access to information items.
 The representation and organization of
information items should provide the user
with easy access to the information in which
he is interested.

5.  Information retrieval is the science of
searching for documents, for information
within documents and for metadata about
documents, as well as that of searching
relational databases and the World Wide Web.

6.  Information retrieval is interdisciplinary,
based on computer science, mathematics,
library science, information science,
information architecture, cognitive
psychology, linguistics, statistics and physics.

7. According to Science and Technology
Dictionary , information retrieval is the
technique and process of searching,
recovering, and interpreting information from
large amounts of stored data.
Britannica Concise Encyclopedia says
information retrieval is recovery of
information, especially in a database stored in
a computer.

8. The concept of information retrieval is broad
and often employed in an imprecise meaning.
It is used to denote systems designed to
provide users or a group of users with
information.

9.  Salton /McGill (1983) gave this definition: An
information retrieval system is an information
system, that is, a system used to store items of
information that need to be processed,
searched, retrieved, and disseminated to
various user populations

10.  The document sub system
 The user sub system
 The searching/matching sub system

11.  A writer present a set of ideas in a document
using a set of concept.
ISAR system serve to match the writer’s ideas
expressed in user’s requirement or demand for
those.
ISAR system serve as a bridge between the
generator of information and the users of that
Information.

13. Representation
Matching
Function Query

14.  To identify the information (sources) relevant
to the areas of interest of the target user’s
community
 To analyze the contents of the sources
 To represent the contents of the analyzed
sources in a way that will be suitable for
matching user’s queries

15.  To analyze user’s queries and to represent
them in a form that will be suitable for
matching with the database
 To match the search statement with the
stored database
 To retrieve the information that is relevant
 To make necessary adjustments in the system
based on feedback from the users.

16. Located
Documents
Retrieval Matching
Document
Store
Content
Analysis
Descriptor
Standard
Vocabulary
Users Query
Analysis
Analyzed
Queries
Feedback Modification

17.  An information retrieval process begins when
a user enters a query into the system. Queries
are formal statements of information needs,
for example search strings in web search
engines.

18. Thank You