Variation and What It Means to be in Control and Capable

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Statistical Process Control for Managers is an eight-chapter book published by Business Expert Press in 2014 and written by Victor E. Sower, professor emeritus of operations management at Sam Houston State University. The book provides a conceptual approach to using statistical process control (SPC) to inform and improve decision-making around business processes and quality improvement. The author reviews the basic methods of SPC and provides practical guidance for using specific tools. He incorporates real-world examples throughout the book and ends each chapter with a summary of key points, as well as questions for managers to ask when applying the concepts to their own organizations. Chapter 2, Variation and What It Means to be in Control and Capable (14 pages), addresses the concept of process variation. The author reviews the concepts of control and capability and offers illustrative examples. He explains how a control chart can be used to determine the level of control in a process. He also reviews measurement techniques and the importance of accuracy in quantitative measures and validity in qualitative measures.
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