345 / 879
Aim of SPC: to make processes in control
•
Two types of causes of variability
:
Common and special causes of variability
Statistically
unpredictable
‘Out of control’
process
Common causes of variability
Statistically
predictable
‘In-control’
process
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
3. Goal: Reaching the target with minimal variation
Part 1
:
Introduction to
SPC
Part 2
:
Essential
concepts to
start with SPC
Part 4
Conclusion
Part 3
:
SPC in
practice
10
03/10/17