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Process capability uses the process sigma value determined from either the Moving Range, Range, or Sigma control charts. Pp and PPk are used for Process Performance. Generally, you use this when a process is too new to determine if it is under statistical control.
The process capability is a measurable property of a process to the specification, expressed as a process capability index (e.g., C pk or C pm) or as a process performance index (e.g., P pk or P pm).
Process capability is defined as a statistical measure of the inherent process variability of a given characteristic. You can use a process-capability study to assess the ability of a process to meet specifications.
Process Capability Analysis is a key method used in Lean Six Sigma and Quality Control and Management. It is primarily used in manufacturing and production processes to evaluate how well a process can consistently produce outputs within specifications (usually set by the customer).
Process Capability (Cp) is a statistical measurement of a process’s ability to produce parts within specified limits on a consistent basis.
What is Process Capability Index (Cpk)? The Process Capability Index is a statistical measure that quantifies a process’s ability to meet specifications. It outputs a numerical value indicating the level of process performance in relation to specification limits.
Manufacturing processes, and all others, must fit this narrow range and be well-centered relative to the specs. In short, process capability processes will help you understand the potential for meeting specifications, identify root causes of defects or deviations, and improve overall process output.