The program's inference engjne is the forward chaining type that goes fmm facts to conclusions. This has to be chosen The purpose of this study is to establish a medical expert because development tool has only forward cbaining type system for diagnosis in the domain of cardiological diseases. rules. The decision-making tree or disease tree, which is This medical expert system will be useful for both patients and binary, is used to be the method of inference engine that physicians. This medical expert system is developed by using decides which rules are satisfied by facts and prioritizes the a public domain rule based expert system (RES). In this sati&ed rules and executes the rule with the highest Every program, fact and rules represent expert and reference book's question goes down one level in this disease tree and has two knowledge. A cardiological disease tree is formed for possible answers, which are "yes" or "no". At first, the most program's inference engine. This disease tree has "yes" or important symptom, which is "chest pain" is chosen. It goes "no" answers to questions. The database of this program has from geneml to speciiic. Fidly, it diagnoses the disease and thirteen diseases. The evaluation of this program is made by advises a recommendation.twenty-five patient data Results are compatible with physician's diagnoses.

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