The application of control charting techniques is not only limited the to manufacturing industry but it covers a wide range of disciplines, such as nuclear engineering (cf. Hwang, Lin, Liang, Yau, Yenn & Hsu 2008), health care (cf. Woodall 2006), education (cf. Wang & Liang 2008) and analytical laboratories (cf. Masson 2007, Abbasi 2010), among many others.