![]() Unstable over time - the result of specific events outside the system. Variation that is inherent in process, and stable over time, andĪssignable, or Uncontrolled variation, which is Shewhart identified two sources of process variation: Chance World as a primary tool to improve product quality by reducing process variation.ĭr. ![]() Statistical Process Control has now been incorporated by organizations around the After early successful adoption by Japanese firms, Walter Shewhart of Bell Laboratories in the 1920's, and wereĮxpanded upon by Dr. The concepts of Statistical Process Control (SPC) were initially developed byĭr. MoreSteam Hint: As a pre-requisite to improve your understanding of the following content, we recommend that you review the Histogram module and its discussion of frequency distributions.
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