
3
1
Introduction to Six Sigma Quality
Six Sigma was developed and used by Motorola in 1986, followed by General
Electric and other companies in both manufacturing and service industries.
Essentially, Six Sigma is a methodology that is used to improve an existing
process (manufacturing/service). This chapter illustrates a number of terms
used in this methodology and also gives an introduction to the DMAIC
(dene-measure-analyze-improve-control) approach used to improve a
process.
Section 1.1 gives denitions of some important terms with examples.
Section 1.2 introduces the DMAIC approach of Six Sigma with an exam-
ple. It also gives the difference ...