Abstract
The application of fuzzy theory was limited to the engineering field in the beginning, but now it began to apply fuzzy theory to non-engineering fields. Many researchers find that fuzzy theory is also useful for the evaluation problems. This paper deals with the application of fuzzy reasoning to the total evaluation problem. It is shown that there are several differences between the structures of fuzzy conctrol and fuzzy evaluation, which make the difference in designing the rules of fuzzy reasoning. As an example, the data retrieval system considering customer's satisfaction is presented.
