Quality & Quantity (2007) 41:387–400 © Springer 2006
Applied Product Capability Analysis Chart
in Measure Step of Six Sigma
K. S. CHEN
, and L. Y. OUYANG
Department of Industrial Engineering and Management, National Chin-Yi Institute of
Technology, Taichung, Taiwan, R.O.C.;
Graduate Institute of Management Science,
Tamkang University, Taipei, Taiwan, R.O.C.
Abstract. This paper will apply product capability analysis chart PCAC in Measure step of
Six Sigma. Because the test model is sampling, sampling error must be consider. Thus min-
imum value will be used to evaluate process capability. Besides the paper used minimum
value to evaluate process capability, we also applied the concept of Six Sigma in PCAC and
construct PCAC of Six Sigma standard. Finally, PCAC of Six Sigma standard will apply in
Six Sigma project of Offset Ratchet Wrenches which manufactured by Y company.
Key words: Six Sigma, process capability index, product capability analysis chart.
In the 1980s and early 1990s, Motorola was one of many US and Euro-
pean corporations whose lunch (along with all other meals and snacks) was
being eaten by Japanese competitors. Motorola’s top leaders conceded that
the quality of its products was awful. They were, to quote one Motoro-
la Six Sigma veteran, “In a word of hurt.” Like many companies at the
time, Motorola didn’t have one “quality” program, it had several. But in in
1987, a new approach came out of Motorola’s Communications Sector – at
the time headed by George Fisher, later top exec at Kodak. The innova-
tive improvement concept was called “Six Sigma” (Pande et al., 2000). Six
Sigma is named after the process that has six standard deviations on each
side of the speciﬁcation window. Such a process produces 3.4 defects per
one million opportunities in the long term (Wyper and Harrison, 2000).
Based on Tong et al. (2004), six sigma has been initiated using statistical
tools and techniques in business, transactional, and manufacturing process.
Author for Correspondence: K. S. Chen, Department of Industrial Engineering and
Management, National Chin-Yi Institute of Technology, No. 35, Lane 215, Section 1, Chung
Shan Road, Taiping, Taichung, 411, Taiwan ROC. E-mail: email@example.com