Process Capability Index (Cp, Cpk)

If Cp and Cpk are equal to 1, this indicates that the variation of μ ± 3σ matches the specification limits; however,
generally, the optimal values for Cp and Cpk are considered to be 1.33 (±4σ).

\(\normalsize Process\ capability\ index\\ USL:\ Upper\ specification\ limit\\ LSL:\ Lower\ specification\ limit\\ \normalsize C_{p} = \large \frac{USL-LSL}{6 \sigma}\\ \normalsize C_{pk} = \large \min \left[ \frac{USL-\mu}{3\sigma},\frac{\mu-LSL}{3\sigma} \right]　\\ \)

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