Bis 100

Only available on StudyMode
  • Download(s) : 49
  • Published : April 2, 2013
Open Document
Text Preview
IS Description Framework

Information Systems Description Framework
Business Information Systems 100
A.Aitken 23/7/12 • v2.5

Introduction
This is a simple framework for describing information systems. The goal of this framework is to provide a structure in which an information system can be described and documented from both an external viewpoint (independent of the information and communication technology used to realise it) and from an internal viewpoint (in terms of the information processors, information stores, and communication networks).

This framework could be used as a tool in information system analysis or information system design by a business analyst or a systems analyst from the external viewpoint and by a systems architect from the internal viewpoint. A systems architect is responsible for bringing different technologies together to create a required information system. Please Note: This is really an information systems modelling framework but we will not get into a discussion of models and what they are in this unit. You will learn more about models and modelling if you do any "systems analysis and design” units. For this unit you will not need to know any more about modelling than it is a way of describing something.

Information Systems Concepts
The concepts involved with information systems are introduced in Learning Unit 2 in BIS100 (presented in Lecture 2, and discussed and practiced in Workshop 3 and Worksheet 3). Please refer to them for more details. Here is a quick introduction to some of the concepts in information systems description: ●













BIS100

Information systems description involves investigating an information system to find out more about it and describe and document what you have found using text and diagrams. An information system may process information and may store and retrieve information. An information system has inputs that submit information into the information system. Inputs may come from people or from external (other) information systems. An information system has outputs that receive information from the information system. Outputs may go to people or to external (other) information systems. An information system has a boundary that defines what is inside and what is outside of the information system.

Information processors are the components of an information system that do the information processing (i.e. processing of information).
Information processing can be done, for example, by people, machines, and computers running software. Information stores are the components of an information system that store and retrieve information. Information storage can be done, for example, using paper, folders, filing cabinets, computer files and databases.

Communication (or information) networks are components of an information system that can transfer information from one point to another.

1

IS Description Framework




Information can be transferred, for example, directly in person, by foot, by post, by computer networks, and by telephone networks.
Information systems description can involve a textual description as well as a graphical representation (i.e. diagrams) of the the information system and these compliment each other.

Information processors (e.g. computers running software or people) are active things in that they do something, i.e. process information, whereas information stores (e.g. databases and filing cabinets) are passive things in they they have don’t do anything on their own. Computers write to and read from databases, just as people write on and read from paper from filing cabinets.

Communication (or information) networks in information systems connect information processors, which may send information across the network to one another. Communication is between two information processors. Information processors can also read and write to information stores, and information flows across this...
tracking img