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Quality Management (QMS) 13 items

Process Capability (Cp/Cpk) Study Checklist

A checklist for planning and executing a process capability (Cp/Cpk, Pp/Ppk) study on identified special characteristics, verifying data validity and reacting to non-capable processes per IATF 16949 Clause 9.1.1.1.

IATF 16949:2016AIAG SPC

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Study Planning

  • Are the special/critical characteristics requiring capability study identified (e.g., from control plan)? *
  • Are the specification limits and target values defined for each characteristic? *
  • Has the measurement system been validated (MSA/GR&R acceptable) before the study? *

Data Collection

  • Is a sufficient sample size collected (e.g., 25 subgroups / 100+ pieces) under normal production? *
  • Is the data collected in rational subgroups over a representative time period? *
  • Are the process conditions during data collection representative of normal production? *

Statistical Validity

  • Has the process been confirmed to be stable (in statistical control) before assessing capability? *
  • Has the data distribution been checked for normality (or an appropriate model applied for non-normal data)? *
  • Are Cp/Cpk (capability) and Pp/Ppk (performance) indices distinguished and calculated correctly? *

Results & Reaction

  • Are the calculated indices compared against the customer/internal acceptance criteria (e.g., Cpk >= 1.33)? *
  • For characteristics that are not capable, is a documented reaction plan (100% inspection/containment) implemented? *
  • Is a corrective action initiated to improve non-capable processes toward the required capability? *
  • Calculated Cpk value

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