M.Comm. / The present study comprises an investigation into and a discussion on the development of expert systems. The theme of the study is of topical interest, since expert systems form an important part of the latest developments in the domain of computer technology. At present, a general deficiency is being experienced in the computer industry in respect of a structured development methodology, and specifically in respect of cost-effective expert systems. The reasons for and causes of the said deficiency, as well as the different ways and means in which possibly to supply this deficiency, represent the issue to be investigated in the present study. Owing to the above-mentioned deficiency in respect of information system methodologies, certain applications and principles have been used throughout the study in a bid to illustrate the differences and similarities between the developmental aspects of certain conventional systems, compared to the same developmental aspects of expert systems. The importance of the various stages of development that the expert system undergo also comes under consideration, together with the development applications and resources, the criteria for cost effectiveness, knowledge engineering and information security. Hereafter, the Sphere Model, based on the introductory chapters, is presented as the solution to the problem posed in the study. This model can, for the entire life cycle of an expert system, be applied in respect of the analysis of the cost effectiveness of such system, and can, at the same time, assist in gathering vital information on the production of subsequent highquality and cost-effective expert systems.

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