8. Mistakes to avoid
8.1 Don't focus on indicators alone
When monitoring an indicator, it is essential to ask whether it is relevant. This must be done by looking at the system as a whole, as it can happen that improving an indicator on a process can deteriorate the system's overall performance.
For example, if you drastically reduce inventories, especially WIP, you'll improve the inventory value indicator. But if the production processes themselves are not stable (which can be assessed with process behavior graphs), the drop in buffer stock levels may result in an overall drop in productivity...
So we need to ask ourselves what the "meaning" of our measurement is, and how it might interact with other processes in the system.
Keep...
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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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