Walter A Shewhart

  • /
  • Blog
  • /
  • Walter A Shewhart

Born: March 18, 1891

Died: March 11, 1967

Walter Shewhart is best known for:

Control Charts - Control Charts laid the foundation of Statistical Process Control (SPC) and modern quality improvement practices, including Six Sigma.

Assignable and Chance Cause of Variation

PDCA Cycle

KEY Takeaways

  • Shewhart introduced the PDCA cycle 
  • Shewhart invented the concept of control charts.
  • Shewhart introduced the concept of assigning the cause of variation into two categories: assignable and chance.

A Brief Introduction:

Walter Andrew Shewhart was an American physicist engineer and statistician, sometimes known as the father of statistical quality control.

Most of Shewhart's professional career was spent as an engineer at Western Electric from 1918 to 1924, and at Bell Telephone Laboratories, where he served in several capacities as a member of the technical staff from 1925 until his retirement in 1956.

He also lectured on quality control and applied statistics at the University of London, Stevens Institute of Technology, the graduate school of the U.S. Department of Agriculture, and in India.


1917: Received doctorate in Physics from the University of California at Berkeley

1924: He introduced Control Charts as a tool to distinguish between the assignable and the random causes of variation.

1931: Published Economic Control of Quality of Manufactured Products.

Control Charts

Control charts are also known as Shewhart charts (after Walter A. Shewhart ).

Shewhart classified the causes of variation as "assignable cause" and "chance cause".

  • $130 course for just $15.99 today!
  • Learn Control Charts, Process Capability using Excel and Minitab
  • 7+ hours of videos, slides & quizzes
  • PDCA Cycle

    The original founder of the PDCA cycle (Plan-Do-Check-Act) is Walter A. Shewhart.  Edwards Deming promoted the use of the PDCA cycle for process improvement and later changed it to the PDSA cycle (Plan-Do-Study-Act).

    Customers served! 1

    Quality Management Course

    FREE! Subscribe to get 52 weekly lessons. Every week you get an email that explains a quality concept, provides you with the study resources, test quizzes, tips and special discounts on our other e-learning courses.

    Similar Posts:

    January 20, 2018

    Edwards Deming – Life Story and Teachings

    December 13, 2022

    9 Quality Gurus and their Contributions

    January 20, 2018

    Kaoru Ishikawa

    January 20, 2018

    Genichi Taguchi

    January 20, 2018

    Walter A Shewhart

    January 20, 2018

    Shigeo Shingo

    January 20, 2018

    Armand Feigenbaum

    32 Courses on SALE!