The requirement level of 6 Sigma Quality is a numerical value almost close to no defect. (3.4ppm less) Then, what is different from the ‘Zero Defects’ concept set forth by Crosby in 1979?
“Zero Defects” set forth by Crosby was focused on no defect of a product. So, it is a concept to emphasize on a result rather than on a process. However, the concept of 6 Sigma focuses on a process, not a product. In other words, it values much of the course that prevents defects by improving processes. This is the different point between 6 Sigma and the existing “Zero Defects”. * ppm : A measuring unit based on 1 million defects.
