CaDDiS (Cattle Disease Diagnostic System)

Welcome to the VIE CaDDiS. CaDDiS is designed to serve as a component of a larger decision support system which will provide information to decision makers within the African agricultural community on the relative likelihood of a cow having different diseases given that you have observed that it exhibits particular clinical signs. The objective of this decision support module is to facilitate better differential diagnosis of tropical diseases. The linking together of different types of techniques such as expert systems, mathematical models, statistical analysis systems, hypertextualised media systems and databases to handle different types of information will produce a system which has analytical and advisory potential.

CaDDiS  is  a  Windows  application  consisting  of  an expert  system  which  uses  the Bayesian Belief Networks methodology. It will run under Windows 3.1, 3.11 and 95. It was  designed  and  developed by Dr. Yiqun Gu  using Microsoft Visual C++. The system is parameterised  using data collected  from  41 veterinary experts.  This data was analysed and converted into a suitable format for use in the belief network by Dr. Iain McKendrick. Two different analyses were carried out, giving subtly different parameter values. These have both been implemented within this system, since we are interested  in  evaluating  whether  either  or  both  are  capable  of  generating  accurate diagnoses. The user interface is identical for each system.

The system uses the Bayesian Belief Network methodology described in Lauritzen and Spiegelhalter (1988). The project team gratefully acknowledge the contributions of the 41 veterinary experts whose expert opinions are codified in the system. The system was developed within the Veterinary Informatics and Epidemiology group of the Universities of Glasgow and Strathclyde.

The properties of the system and advice on how to use it are described in the Guide to CaDDiS, while a simple introduction to the principles which underlie its operation is provided in the Dummy''s Guide to Belief Networks.

We hope that you will enjoy using CaDDiS and will take part in the evaluation exercise. We will be interested to hear whether veterinarians agree with the findings of the system.

Link to CaDDiS Page


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