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© IRL Press

Ecological applications using a novel expert system shell

J.A. Bradshaw , K.J. Carden 1 and D. Riordan 2

Computer Laboratory, Corn Exchange Street, University of Cambridge Cambridge, CB2 3QG, UK
1Department of Computer Science, Rhodes University PO Box 94, Grahamstown, South Africa 6140
2School of Computer Science, Technical University of Nova Scotia, 1190 Barrington Street Halifax, Nova Scotia, Canada B3J 2X4

Much of the information used by ecologists in modelling and decision making is imprecise. The imprecision arises both from data that are inexact or incomplete and from the use of ecological principles that are sometimes less than fully reliable and may be conflicting. Nevertheless, expert ecologists are able to construct usable models and make decisions that are used to manage and control ecological resources. This paper describes a unique expert system shell, developed in conjunction with user ecologists, which incorporates features enabling ecologists to represent knowledge and uncertainty in their expert systems in a way that is natural and appropriate. The reasoning mechanism was similarly developed in conjunction with user ecologists. It produces solutions to a class of expert level problems along with explanatory mechanisms and an appropriate analysis of the reasoning process. Three expert systems have been constructed by ecologists using this expert system shell. This enabled the shell designers to evaluate features for inclusion in the shell. The successful use of the shell by the ecologists has shown that significant economies arise when expert system shell design is tailored to use by a specific class of experts, in this case ecologists.

Received on August 27, 1990; accepted on September 25, 1990

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