Article | REF: R290 V1

Statistical process control - Using control cards

Authors: Françoise BOULANGER, Georges CHÉROUTE, Valérie JOLIVET

Publication date: March 10, 2006

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1. Process parameters and product characteristics to be controlled

1.1 Process parameters

To control a process, it is necessary to work on the parameters of that process rather than on the characteristics of the product, i.e. to identify cause-effect relationships and quantify them at least summarily (for example, the effect of temperature on the viscosity of a polymer).

Various tools can be used for this research, including :

  • fault tree or cause tree ;

  • cause-effect diagram (also called "fishbone" or "Ishikawa" diagram);

  • correlation and regression studies ;

  • experience plans ;

  • data analysis: principal components...

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Process parameters and product characteristics to be controlled