Analysis / R&D and engineering

Check process capability analysis assumptions

Check process capability assumptions in Proforma. Review measurement quality, stability and subgrouping before computing indices or interpreting specifications.

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Your starting prompt.

Review [process measurements] for a proposed capability analysis against [specification limits]. Check measurement adequacy, time ordering, subgroup logic, process changes and distribution assumptions before computing any requested index. Show stability and coverage limitations and explain when an index would mislead. Preserve excluded observations with reasons and prepare a review report. Do not certify process capability or confuse specification limits with statistical control limits.

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Method and review

Keep the assumptions visible.

Specify units, calibration, baselines and the experimental method. Check measurement quality and uncertainty before extending a result beyond the observed conditions.

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A process specialist should approve subgrouping, stability and distribution assumptions before using capability indices.

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Before you begin

Permitted measurement and specification records
Qualified process and measurement-system review

Work with permitted files or queryable data. Verify the result against the original records.

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