Walter Shewhart, the developer of control charts, believed quality is associated with consistency of performance.

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Walter Shewhart's philosophy was based on the idea that quality is achieved through consistency in performance, and that variability can be controlled and reduced through the use of statistical process control. Control charts were developed as a tool to monitor and manage this variability, helping to ensure consistent quality over time.

Walter Shewhart, the Developer of Control Charts, Believed Quality Is