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A Guide to Six Sigma and Process Improvement for Practitioners and Students: Foundations, DMAIC, Tools, Cases, and Certification, Second Edition by David M. Levine, Howard S. Gitlow, Richard Melnyck

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Chapter 13. Dmaic Model: ‘I’ is for Improve

What is the Objective of This Chapter?

The objective of this chapter is to take you through the various steps of the Improve phase of the Six Sigma DMAIC model so that you can apply them on projects at your organization. We will use a case study to demonstrate how the steps of each phase are executed in real world projects.

Purpose of the Improve Phase

Let’s go back to our equation CTQ is a function of one or more Xs or CTQ = f(X1, X2, Xi,....Xn) where:

• CTQ is a measure of your problematic key indicator.

• Xi represents the ith factor that causes your CTQ to be problematic.

First, we completed the Define phase and identified our CTQ(s). Second, we completed the Measure phase by operationally defining, ...

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