Lean Manufacturing and Six Sigma Definitions

Glossary terms, history, people and definitions about Lean and Six Sigma

Walter Shewhart

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Walter A. Shewhart (March 18, 1891 – March 11, 1967) was known as the father of statistical quality control (SQC or SPC) and is also the founder of the “Shewhart cycle” or Plan Do Check Act (PDCA).

He developed his skills while working at Bell Telephone to improve the reliability of their transmission systems, and later improve the voice clarity of the carbon transmitters in the company’s telephone handsets.

Shewhart’s work focused on reducing variation in a manufacturing process. He framed the problem in terms of assignable-cause (special cause) and chance-cause (common cause) variation, and introduced the control chart as a tool for distinguishing between the two.

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