138 Improving reliability and quality for product success
cannot exceed it. As shown in the rst line of Table7.1, a market defect rate
of 4.5% is much greater than an undetectable rate of 1.0%. This large dif-
ference between the undetectable rate and the market defect rate indicates
that managing the inspection process for this product is a mere formal-
ity. Perhaps the manufacturing head in this situation insists that quality
issues are due to design mistakes or that it is not possible to adhere to
the specications of a difcult design. While of course it is essential to
identify any design problems once the item goes to the manufacturing
site, it should nonetheless be required that manufacturing chiefs reach an
acceptable in-house defect ...