APPLICATION OF FUZZY QUALITY FUNCTION DEVELOPMENT (FQFD) FOR PRODUCT OPTIMIZATION AND CORRECTION AND ECONOMIC EVALUATION (A CASE STUDY OF SINA BRICK PRODUCTION FACTORY IN SHAHREKORD CITY)

ABSTRACT In the present study, the FQFD is used in the brick production industry. Customers' demands or requests, for which relative and real weights are calculated in the form of fuzzy numbers, are initially gathered and are, entered into home of quality along with technical specifications obtained form the factory experts. Using the algorithm introduced in connection with the matrix of relations between requests, technical specifications and the matrix of correlations between the technical specifications themselves in the fuzzy environment, the importance of each technical specification is then known in relation to customers' requests. After defuzzification, these specifications, based on which the product will be optimized and corrected, are ranked