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Control Chart for Monitoring Performance of Process

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Dil Bishkarma Centreville, Va, United States
When a control chart is used to monitor performance of a process, which of the following will be set by the projct manager and the appropriate stakeholders to reflect the point (s) at which corrective action will be taken to prevent exceeding the specification limits?
A. Upper and lower control limits,
B. Upper and lower specification limits,
C. Process Mean, and
D. Data Points.
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Keith Novak Tukwila, Wa, United States
A) Control limits

C) is probably meant to trick you. A centerline is required to depict your ideal process output, but the true mean is based on your output, not your target value.
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1 reply by Dil Bishkarma
Nov 17, 2021 11:35 AM
Dil Bishkarma
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Thank you very much Keith for your straightforward response.
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Kiron Bondale Retired | Mentor| Retired Welland, Ontario, Canada
I'd agree with Keith that the correct answer is A. Upper and lower spec limits are important but they are closing the barn door after the horse has left if we are worried about exceeding them. The process mean and individual data points are of value but only in the context of whether the process is in control or not and within specifications or not.

Of course, this does assume that the UCL and LCL fall within the USL and LSL. If not, then nothing else matters :-)

Kiron
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1 reply by Dil Bishkarma
Nov 17, 2021 11:37 AM
Dil Bishkarma
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Hello Kiron,
I appreciate for your elaborative response. It makes much more clear. Sensational!!!
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Dil Bishkarma Centreville, Va, United States
Nov 17, 2021 10:51 AM
Replying to Keith Novak
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A) Control limits

C) is probably meant to trick you. A centerline is required to depict your ideal process output, but the true mean is based on your output, not your target value.
Thank you very much Keith for your straightforward response.
avatar
Dil Bishkarma Centreville, Va, United States
Nov 17, 2021 10:54 AM
Replying to Kiron Bondale
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I'd agree with Keith that the correct answer is A. Upper and lower spec limits are important but they are closing the barn door after the horse has left if we are worried about exceeding them. The process mean and individual data points are of value but only in the context of whether the process is in control or not and within specifications or not.

Of course, this does assume that the UCL and LCL fall within the USL and LSL. If not, then nothing else matters :-)

Kiron
Hello Kiron,
I appreciate for your elaborative response. It makes much more clear. Sensational!!!
avatar
Rami Kaibni
Community Champion
Senior Projects Manager | Field & Marten Associates New Westminster, British Columbia, Canada
Totally agree with Keith and Kiron, you are good with A as an answer.

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