Establishing and controlling process capability - Meaning of Phrases

D

D.Salman

#1
#1
Dear All,
I’m a bit confused about the meaning of the following phrases?
1.The process is capable of yielding conforming service.
2.The process actually meets the requirements?
Any help will be appreciated.
 
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#2
#2
Re: Establishing and controlling process capability

D.Salman said:
Dear All,
I’m a bit confused about the meaning of the following phrases?
1.The process is capable of yielding conforming service.
2.The process actually meets the requirements?
Any help will be appreciated.
Click to expand...
A process in control is in the ideal state 100% conforming and predictable
-must remain stable over time
-must operate in a stable and consistent manner
-must be set at the proper level
-the natural process spread must not exceed the product’s specified tolerance

In essence, both of your statements are looking for the same results - the ideal process always yields the correct results (within specification), and can be proven to do so.
 
T

Tom Slack

#3
#3
These terms mean something very specific in the Quality field.

The word "capable" means if the process is stable, it will yield adequate results. Variability is the most important issue. For example, if specifications specify a variance of of 2 or less and the process has a variance of 4, we know there no use in attempting to use this process. In this case, we say the process is not capable. An engineer that tries to use the process by adjusting the set point is in for a great deal of frustration!

Even the phrase "Meets the requirements" is not as simple as it seems. The question is: whose requirements? This may be part of a Quality Function Deployment discussion. This phrase could also be a part of a discussion concerning "fitness for use", which is a Juran concept.

I hope this puts you in the right direction!

Best wishes,

Tom
 
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