British Standard BS 6208:1990 treats the ultrasonic inspection of steel castings and the consequent assignment of quality levels. This standard is considered as a case study for reframing such specifications in terms of fuzzy sets. The advantage of using fuzzy sets is the elimination of sharp boundaries between quality levels and between cross-section zones with their attendant borderline cases, thus producing smooth natural changes with improved quality control. The standard does not specify a method for estimating a consolidated quality level rating from the individual quality levels obtained from the several criteria in the standard. Such a method, a consequence of the fuzzy sets treatment, is proposed here.
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