Expert systems are well known area of artificial intelligence and have a huge impact in various fields of life. It has been widely used in managing uncertainty and vague information, which models the ability of humans to make rational decisions. One of the challenges that expert system faced is to deal with uncertainty. Even though there are many uncertainties management approaches which can deal with problems of different types. This paper reviews the trends and general information regarding the expert systems in order to highlight, classify the different approaches in terms of the applications and target area of problem solving. The concepts and techniques used in the development of selected expert systems have discussed which are medical, agriculture, and education. These can serve as a guide in selecting suitable expert systems in their area of problem solving. It is concluded that while expert systems have great potential, they remain un-established as a useful technology due to a lack of research and documentation.
Artificial intelligence, Expert systems, Uncertainty, Fuzzy logic
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