Capability data collection plan

Define where data will come from and what conclusions they may support before calculating indices.

Define the question, feature, unit, part and revision. Record specification limits and their authority; do not derive them from the sample.

Document measurement method, instrument, preparation and system review. Flag missing metrological information.

Define the period, machines, cavities, shifts and material. Justify part selection, time sequence and subgroups technically.

Preserve every reading identity and process event. Define how missing data, repeat readings and unusual observations will be handled without erasing them.

Plan reviews of stability, distribution and the sigma estimate. Record the analyst, limitations and report review; do not infer acceptance from a single index.

Fictional example

FICTIONAL: study DEMO-S12 concerns length L on drawing revision D. Records are planned with time and cavity C1 or C2, retaining their separate identities. Sample count and frequency await technical approval. An incomplete form is not presented as a completed capability study.

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Use

Free for professional use and personal or internal adaptation. Retain VYRCO attribution and label changes. Do not resell or redistribute a modified version as an original VYRCO resource.

Sources

NIST/SEMATECH · Assessing Process Stability · Stability and time order as context for interpreting process data.

NIST/SEMATECH · What is Process Capability? · Capability index definitions and assumptions; does not set an acceptance criterion for your product.

info@vyrco.com · Accessed 2026-10-10