VYRCOWho it is for and what is included
Quality, engineering and process owners.
Level: Intermediate. Includes instructions, recording fields, a fictional example and reference sources.
How to use it
- 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.
Scope and limitations
Does not specify sample sizes, minimum indices or acceptance sampling plans. Does not establish stability or normality; those analyses and their assumptions need justification.
Sources consulted
- 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. - NIST/SEMATECH · Production Process Characterization
Planning manufacturing data collection and analysis.
Editorial review: 2026-10-10 · Original forms and general guidance. Always apply the drawing, manual and authorized procedure for your case.