Purpose – This paper aims to present a quality and business improvement framework based on Six Sigma/design, measure, analyze, improve, and control (DMAIC); design for Six Sigma (DFSS); and Lean principles. An historical perspective on these methods is also provided....

Three functions are identified and integrated into one unique control scheme for multivariate quality control. The control scheme will identify any out‐of‐control samples, select the subset of variables that are out of control, and diagnose the out‐of‐control variables. New control...

The content of this dissertation is divided into two main topics: 1) nonlinear profilemonitoring and 2) an improved approximate distribution for the T^2 statistic based on thesuccessive differences covariance matrix estimator. (Part 1) In an increasing number of cases the quality of a product or...