1. Observe measurements over time
Invented by Shewhart, whose disciple Deming considered himself to be, the theory of variation has been taken up by Six-Sigma, TPS and SPC, but its applications are more general than in industry or the service sector. The theory was designed to be simple. It can therefore be easily applied to all the measures and indicators monitored in an organization, with a minimum of information.
The theory of variations is a key management tool, insofar as it can be used to interpret variations in measurements or indicators over time, and to guide decisions or actions for improvement.
A common practice is to compare the observed period (day, week, month...) with the previous period or with the same period of the previous year, and to draw a conclusion (improvement or deterioration)....
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Observe measurements over time
Listen to the voice of the process
Bibliography
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Bibliography
Deming, Hors de la Crise , Éditions Economica
Shewhart, Les fondements de la maîtrise de la qualité , Éditions Economica
Wheeler, Understanding variations , Éditions SPC Press (Very didactic book, detailing concrete examples from the management of industrial companies. I have borrowed from this author the terms "natural process limits",...
ToolWebsites
Association française Edwards Deming
Website of the Association Française Edwards Deming. This site offers a biography of Deming, as well as a series of free resources on Deming: a selection of articles, e-books and statistical software. You'll also find a French translation of Western Electric's Manual of Statistical Quality Control....
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