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Aphrodite Tsalgatidou
University of Athens,
Department of Informatics

Organisational and Information Systems
Approaches to Information Systems Development
A Framework for Systems Analysis and Development
Problem Analysis
Process Analysis
Conceptual Data Modelling
System Design (Process, Data and U.I. Design)

Organisational Systems
System: A collection of interrelated parts which act as a whole towards a common goal
Externally, systems have boundaries and interact with their environment (regarded as open systems)
Internally, systems contain subsystems interacting to serve a common goal
Interaction is governed by a set of rules and stimuli from ext.envrironment

Information Systems
Defined as the mechanism providing the means for storing, generating and distributing infromation for supporting operations and management functions of an organisation. Can be manual, semi- or fully-automated.
Information can be of two main kinds;
operational information
management information

Developing an Information System
What is the technology that makes information systems work ?
Databases, data communications, development environments, programming languages, etc.
How are Information Systems developed ?
What is the process of developing software which constitutes the automated information system of an organisation

The Information Strategy Planning Phase

identify system goals and scope of system development
define a technical architecture which provides a statement of direction for h/w and s/w facilities
outline proposed arrangements for management and control of the information systems activity within the organisation
formalise a problem definition which will act as a control mechanism for the remaining phases of the development process

The Requirements Analysis Phase

accurately model the part of the system in which the analyst is interested
accurately model the user requirements
encourage user involvement
produce an analysis specification which can be transformed easily into a design specification
fully document the existing system
coordinate the work of many analysts working on a large complex system and consider many user views, thus resolving conflicts, interderminancies, redundacies, etc.
view the system as a whole, I.e. a set of interrelated parts which all act together towards a common goal



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