QMS 102 Lecture 10: Chapter 9
29 Dec 2017
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Document Summary
In this lesson, you will learn how to use statistical methods to control and monitor the quality of products and services. A process is the value-added transformation of inputs to outputs. The inputs and outputs of a process can involve machines, materials, measurement, people, methods, and the environment. Both input and the output are sources of variation. This variability can result in poor product or service quality, which often affect customer satisfaction. In a control chart, data that are collected sequentially over time are analyzed. We use control charts to study past performance, to evaluate present conditions, or to predict future outcomes. These charts are used at the beginning to study an existing process. The results of phase one control charts are used to improve the process. These charts are used to monitor the improvements once they are implemented. The principal focus of a control chart is to separate special causes of variation from common causes of variation.
