Operations / Six Sigma
Process Capability (Cp / Cpk / Pp / Ppk) Cp, Cpk, Pp, Ppk
Whether a process's natural spread fits inside the spec limits, and whether it is centered between them, scored as a single ratio.
The fork, why two teams get different numbers
Two forks stack, and both move the index by a lot.
In the Metric Library
- The full fork, both definitions worked all the way through
- The trap that makes the number lie, on a real export
- Every formula variant, spelled out
- The reconciliation anchor, what to tie it to and when to refuse
Reference: AIAG SPC reference manual (Cp/Cpk vs Pp/Ppk) · ISO 22514 process-capability convention · ASQ