The vital benefit of incorporating a fuzzy routine of the kind described is that, with a relatively short period of development, it is possible to utilized know-how gained through experience for representing woven fabrics. Using fuzzy set theory, it is possible, in an almost ideal way, to render existing expert knowledge usable for certain calculations, despite the absence of precise mathematically formulated physcial interrelationships. System development and testing with an appropriate development tool can be undertaken by the technologist without extensive programming knowledge. All that is required from the programmer is the setting-up of the appropriate interfaces and the provision of the correct analysis of the output of fuzzy system.