Process Capability is a method used to demonstrate that a process is 'capable' of achieving the required tolerances (specifications). It is a routine requirement for all processes in the automotive industry, among others. Process Capability is measured using the indices Cp and Cpk.
Process Performance is a closely related concept, but the calculation of the performance indices Pp and Ppk is done in a way that takes into account longer term variation in the process. Process Performance is usually used for process improvement.
Topics in Process Capability and Process Performance include: