Quality Management 2017

A NALYZE

6. Effects of variability on the process

• A normal distribution is fully characterized with only two parameters:  The mean : information on process’ position.  The standard deviation  : information on process’ dispersion .

Part 1 :

Introduction to SPC

Mean drift

Lower Specification Limit (LSL)

Upper Specification Limit (USL)

Part 2 :

Essential concepts to start with SPC



Part 3 :

SPC in practice

Mean

Séri

2 causes increasing the proportion of data out of the specification limits

Part 4

Conclusion

in control process

Dispersion drift

 monitor their evolution

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