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Statistical Process Control
Statistical Process Control is not an overnight cure for production
problems. To work well, SPC must be used as an ongoing program
involving all levels of personnel with a joint goal of improving quality
efficiently and continuously.
We know how the process acts normally, and we know how each cause
affects the process; then we can make educated corrections when the
process strays from the norm.
Remember: If the effect each cause has on the process and what can
be expected from that process are known, then corrective action can
be taken when the results are not those desired. This is a key concept
in SPC.
7.Deming and the SPC Story
Dr. W. Edwards Deming has been called the “Father of SPC” because
his work in developing and promoting its basic concept played an
important role in SPC’s growing use.
In the mid-1920s Deming left a teaching post at the University of
Wyoming to join the Federal Bureau of Statistics as a mathematical
advisor. In Washington, he was also responsible for teaching courses
in mathematics and statistics for the Department of Agriculture from
1933-1946. His interest in process control, however, was apparently
sparked by his meeting Dr. W. W. Shewhart in 1928. Dr. Shewhart,
developer of the SPC control charts still in use today, was then a
member of the technical staff at Bell Telephone Laboratories.
Deming recognized the impact Shewhart’s methods could have on
American industry and he soon had a chance to put those methods
to work. After the beginning of World War II, Stanford University
wanted to aid the war effort. Deming suggested that Stanford teach
the simple yet powerful techniques of statistics to engineers and
others. He believed this would bring about better precision and higher
productivity to the nation’s plants. Stanford accepted his offer to teach
the first few courses, and after the first class in July of 1942, Deming
AIDT - Statistical Process Control - October 5, 2006