Statistics and Measurement
Good measurement is fundamental to quality assurance. That which cannot be measured cannot be guaranteed to a customer. If Brinell hardness 220 is needed for certain castings and one has no means of reliably measuring hardness, there is no way to provide the castings. So successful companies devote substantial resources to the development and maintenance of good measurement systems. In this chapter, we consider some basic concepts of measurement and discuss a variety of statistical tools aimed at quantifying and improving the effectiveness of measurement.