Towards a generalized model of diagnostic behaviour

E.T. Keravnou, L. Johnson
1989 Knowledge-Based Systems  
A model of diagnostic behaviour shared by most diagnostic tasks is discussed. The model is, by-andlarge, presented at a conceptual (knowledge) level. Its expression at more concrete levels is task dependent. The modelS use can be seen as being twofold: first as an aid in the construction of more adequate shells for diagnostic tasks; and second, and more importantly, as the initial (albeit crude) interpretation model held by the knowledge engineer about to embark on the cumbersome task of
more » ... ng a particular expert diagnostician's behaviour. Two approaches to the use of computers in diagnosis can be identified: first, one can use the computer's speed, arithmetic capabilities and storage capacity to solve problems in ways that people cannot; and second, the computer's plasticity can be used to model human problem solving. Combining these approaches offers the prospect of extending the range of diagnostic procedures. The diagnostic model discussed in this paper is intended to be a framework for combining the two fundamental approaches. We believe that only a framework which is a global model of human diagnostic reasoning can form an adequate basis for such a combination. Our global model contains a fundamental division between what Chandrasekaranl has called the generic task, and the data handling capacities of human beings. In the model, intelligent data handling is performed through a multi-faceted procedure called Decide-Status: it is through Decide-Status that access to mathematical models and large amounts of data can be provided in ways that are congruent with the demands of the generic task. The diagnostic model, however, has a second very important function: it forms part of a well founded and
doi:10.1016/0950-7051(89)90021-x fatcat:hjeurijjtbdoblpdvjr3fwh4km