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Structure of an information System
An information system may be viewed as indicated in the Figure 1. Information systems accept (input), store (in files or database), and display (as output) strings of symbols that are grouped in various ways (digits, alphabetical characters, special symbols). Users of the information systems attribute some value or meaning to the string of symbols. Our emphasis here is on the characteristics of systems rather than on the meaning attached to the output.
Any organisation must seek to develop an information system that meets the majority of the information requirements of the organisation. Different types of information systems are used in different organisations. Generally library and information professionals are concerned with library management systems and Information Retrieval Systems. Library management systems are transaction processing systems and support the control of transactions associated with acquisitions, cataloguing, circulation and serials control, etc.
Storage The second aspect of information retrieval is storage. Information retrieval systems may use the computer itself to store both the document files as well the index fi
Problem: (i) ‘Many Information Systems projects in the public sector have failed due to poor change management procedures'. Discuss this statement with examples. (ii) An I
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INFORMATION MATERIALS: Let us study in brief how information materials are produced, the agencies that produce them and the information channels through which information abo
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Problem: (a) Describe some of the major changes that information systems are bringing to organizations. (b) How are information systems changing the management process?
Criteria for the Selection of Databases on CD-ROM The following criteria may be observed for the selection of databases on CD-ROM. i) Database Contents: Coverage and i
Problem: (a) One of the design principles of Norman is to provide a good conceptual model. Describe the conceptual model and how is it used by system designers? (b) List d
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