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GUIDE: 4 possible states of a process:
STABLE?
CAPABLE?
1 3
2
4
YES
YES
NO
NO
1. Comfortable situation
2. Limit case
4. Chaotic/disordered situation
3. Process close to chaos
100% of products conform to specifications
Not a constant situation
Good time to improve the process
Improve the process to go in 1
Decrease dispersion or recenter the process on
the target, or reconsider the definition of spec. limits
Unstable process where everything could happen.
100% of products conforms to spec. but probably for a short period of time
Find the special causes, eliminate them and
stabilize the process to go in 1 or 2.
Make large improvements to stabilize the process
First : STABILIZE the process
and then
Make it CAPABLE
A
NALYZE
03/10/17
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