4. What kind of decisions should be made to improve the system?
As well as alerting us to truly abnormal variations, the theory of variations guides us as to the nature of the decisions we need to take to improve a process or system. As mentioned above, these can be of two kinds.
4.1 Variation is abnormal
A particular cause (also called special or assignable) must be sought. The measure is often an aggregation (sum or average) of the various data collected during the observation period. A first analysis can be made by detailing these different data.
SCROLL TO TOP4.2 Variation...
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What kind of decisions should be made to improve the system?
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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",...
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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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