Studies on Fuzzy Logic and Dispositions for Medical Diagnosis

For designing and developing a knowledge-based system we need to store expert’s knowledge in a suitable form, known as knowledge base, and then applying a suitable reasoning process to arrive at a decision. Formal logic, a two-valued logic, known as predicate logic, is suitable for developing and inferring for systems like mechanical theorem proving. But if we want to develop a serious real life knowledge-based system like Medical Diagnosis, formal logic fails to describe the knowledge-base, and obviously Fuzzy logic and extension of Fuzzy logic, known as dispositions as proposed by Zadeh, come in to rescue and ultimately enabling us to use linguistic variables. In this article an attempt has been made to show how fuzzy logic and it’s extension, particularly dispositions, can be used for modeling a medical diagnosis system.