Fuzzy Sets Approach to Quality Control

The quality characteristics are made up of different types of sets and can be classified as variables from the instrument measurements based on infinite natural sets, and attributes for non conforming descriptions based on the binary or natural sets. However, there is also a type of quality characteristics-linguistic-which is used in this paper for the subjective estimations of casting defects. The goal of this paper is to show how a fuzzy set theory can be applied to well-known powerful techniques of the quality control, using linguistic data for the casting defects.