Quality Management 2017
3. Goal: Reaching the target with minimal variation
• Two types of causes of variability :
Part 1 :
Common causes (or random causes) Inherent in the process, responsible from small varia tions Special causes (or assignable causes) Not inherent in the process, their effects significantly disturb the normal evolution of the process
Introduction to SPC
Part 2 :
Essential concepts to start with SPC
‘In-control’ process
‘Out of control’ process
Part 3 :
SPC in practice
Common causes of variability
Common and special causes of variability
Part 4
Conclusion
Statistically predictable
Statistically unpredictable
Aim of SPC: to make processes in control
03/10/17
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