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Everything about Process capability index

Statistical measure of process capability

The process capability index, or process capability ratio, is a statistical measure of process capability: the ability of an engineering process to produce an output within specification limits. The concept of process capability only holds meaning for processes that are in a state of statistical control. This means it cannot account for deviations which are not expected, such as misaligned, damaged, or worn equipment. Process capability indices measure how much "natural variation" a process experiences relative to its specification limits, and allows different processes to be compared to how well an organization controls them. Somewhat counterintuitively, higher index values indicate better performance, with zero indicating high deviation. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Process capability indexA 5-minute orientation
  2. Skim a recent paper: Maintaining viability by rapid supply chain adaptation using a process capability indexInfluential work since 2022
  3. Pick up a classic book: Modern Operating SystemsThe most-reprinted book on the subject
  4. Read the landmark paper: A new process capability index for non‐normal distributionsCited 59 times
  5. Go sideways: Process performance indexA closely related topic
  6. Go sideways: Z-factorA closely related topic

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