The document discusses Selective Dissemination of Information (SDI) and its role in providing users with updates on new library resources tailored to their specific interests. Originating from a concept introduced by Hans Peter Luhn in the 1950s, SDI differs from Current Awareness Services (CAS) in that it offers personalized information rather than general updates. The document outlines the objectives, components, and differences between SDI and CAS, emphasizing SDI's automated and user-focused approach.

1. By
Pritee Sharma
Assistant Professor ( A.C.)
School of Library & Information Science
Uttarakhand Open University, Haldwani
Library Alerting Services (SDI & CAS)

2. SDI
SDI refers to tools and resources used to keep a user
informed of new resources on specified topics,
including the current-awareness services used to
inform about new library collection.
It is a type of current awareness service, by which
specific types of users have to inform by the
mechanism or program by the library the new library
collection according to their needs and interest...

3. Foundation
The concept of Selective dissemination of information
was concept firstly introduced by Hans Peter Luhn of
IBM in the 1950s.
The mechanized SDI system based on Luhn’s design
was first implemented in 1959 at the Advanced
Systems Development Division of IBM Corporation at
Yorktown Heights, New York.

4. Definition Continue…
 SDI service as a manual and automated service which attempts for a
personal service (CAS) selecting for each individual that are relevant to
him.
-- Judith Holt Connor
 “It is activity of supplying a clientele on a regular basis with requested,
specific type of information the emphasis is on the specific.”
-- Edmon Wearing.

5. Objective and Aims
To update researchers and Specialists.
To provide personalized CAS to Specialist to be
informed about new collection/documents
according to his/her interest.
To prevent parallel execution and replicable
research.
To save the time of researchers /Specialists.

6. Components
Component
of SDI
User profile
Document
Profile
Mechanism or
programme to
match the profile
User feedback
system

7. Process of SDI
Selection
Notification
Feedback
Modification

8. User’s need and
Interest
User’s profile
New Document
Analysis, Indexing
& Abstracting
User’s
Database
Library
Doc.
Database
Matching
Notification
User’s
feedback/responce
Analysis Document Delivery
Profile
Modificati
on

9. Difference Between CAS and SDI
 CAS is common to all
users.
 The Subject coverage is
the border
 It can be seen in all library
 SDI is a personalized
service.
 The Information is to
share with the specified
user according to his or
her need or interest.
 It is available in big and
special libraries, R & D,
and IITs libraries.

10. Difference Between CAS and SDI…
 This service can be operated
without a computer.
 Feedback is not required in
CAS.
 CAS is provided by
circulating the current list of
periodicals among all the
users
 To aware the user about the
new collection/ information
 SDI is a computerized
service.
 Feedback is an important
step in SDI
 The user/reader has received
the pinpointed or refined
information.
 We can Save the time of the
user by SDI.

11. Thanks