Difference between cp cpk and pp ppk pdf5/29/2023 ![]() Cpk is known as the “process performance index” or “process capability index.” The difference between Cp and Cpk shows that as well as being able to indicate the capability of the process to produce within specification, in Cpk, there is an indication of the ability of the process to conform to the target value. LSL = lower specification limit Cpk IndicatorĬpk is more like an adjustment of Cp for a non-centered distribution effect. Mathematically, Cp is expressed as follows: There is no indication of the ability of the process to adhere to a target value. It is measured using standard deviation and specification limits only. Cp is also referred to as “process potential index” this index indicates whether or not the process is capable of producing products to meet specifications. The Cp index is the simplest indicator of a process capability. Difference between Cp and Cpk Cp Indicator In any business, understanding the capability of a process is essential as this helps set achievable goals. ![]() ![]() They both compare the process spread to specification spread and are thus used to measure process capabilities. ![]() They are both used to indicate the ability of a process to make a product that meets the specified requirement. Cp and Cpk are commonly referred to as capability indices and we will look at the difference between Cp and Cpk.
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