Therefore, it is imperative that players hit their Imagine the coach wants the football to be hit on topmost of the centre of the goal posts (or any other part)? Why ? Because goalkeepers normally try to distract the kickers(football players) and makes a pre-meditated move. He/she would expect his/her wards toĬonsistently hit a target within the goal post. But the coach would like his/her wards to be highly consistent. The players think that putting the ball in between the posts is a goal (which it is). Assuming the goal posts on both the ends to be the specification(spec) limits. To explain the concept of Cp, Cpk more - let us take a couple of imaginary examples mimicking real time sports.Įxample 1: Imagine a football team practising penalty kicks. The formulas related to this areĬpk u=(USL-XBAR)/(3*SD) Cpk l=(XBAR-LSL)/(3*SD) where SD is Standard Deviation and is actually denoted by 'Sigma' symbol. Cpk splits the Cp into 2 parts, Cpk l and Cpk u.Ĭpk takes the lesser of the two values. Cpk addresses the proximity of the centring of a process related to the spec. The answer is that Cp does not consider how well the output is centred on the target value. If Cp portrays the capability to meet the customer specification limits, then why do we need Cpk. A Cp value of < 1 indicates that the process is poor. A Cp value of 2 represents that process performs at 6 sigma level. A Cp value of >= 1, indicates that process is technically capable. In other words, Cp = Voice of the Customer/Voice of the Process = (USL-LSL)/(6*SD) where SD= Standard Deviation and denoted by 'Sigma' symbol. Cp is the ratio of the specification limits (of a characteristic) to the natural process variation of a process (under a state of A capable process is one in which the output always adheres to the customer specifications. Process Capability is an inherent variability of a given characteristic in a stable process. The best answer is always shown at the top among responses and the author finds honorable mention in our Business Excellence dictionary at along with the related term.īefore we dwelve upon explaining the inferences of these Cp, Cpk values, let us quickly revisit Cp, Cpk definition.Ĭp, Cpk are Process Capability Indices.Please visit the forum home page at to respond to the latest question open till the next Tuesday/ Friday evening as per Indian Standard Time.All questions so far can be seen here.Note for website visitors - Two questions are asked every week on this platform. Cp and Cpk can be calculated using the calculator at Įxplain the inference of the Cp and Cpk values that you get for the given data and give some inputs on the kind of action required.
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