u/GrittySausages

Just a question regarding Cpk / Ppk tracking for attribute-style process outputs.

In some cases where the desired outcome is naturally biased toward one specification limit (rather than centred between LSL and USL), Cpk/Ppk may not always reflect the true process performance, since the metric favours centred distributions.

Would Cp (potential capability) be considered a more appropriate indicator in scenarios where the objective is to consistently perform as close as possible to one specification boundary while remaining within tolerance?

Has this topic or approach been discussed previously?