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    Winners of Excellence Ambassador Episode 2 (October 2017) 

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    • Q 79. For Process Performance Assessment, one may use Capability / Performance Indices (Cp, Cpk, Pp, Ppk) or Sigma Level inter-changeably. Compare and contrast their utility and highlight why someone would prefer one over the other.    This question is a part of Excellence Ambassador initiative and is open for 3 days. There is a reward of 5000 points for best answer in 3 days. All rewards are mentioned here - https://www.benchmarksixsigma.com/forum/excellence-ambassador-rewards/.   The scoreboard is here -  https://www.benchmarksixsigma.com/forum/business-excellence-scoreboard/   All questions so far can be seen here - https://www.benchmarksixsigma.com/forum/lean-six-sigma-business-excellence-questions/
    • Long term performance of a process means Sigma Long Term and Short term performance of a process means Sigma short term. The question is why Sigma short term is calculated and treated differently than Sigma long term.   Sigma short term of a process is usually given higher value than Sigma long term of the same process because, it is without any noise and reflects the current state of the process. Smaller deviation is seen in the process when measured in the short term, similar to students performing excellently in Unit tests and weekly class tests. The person studies a smaller portion and answers a smaller set of questions, similar to having a smaller set of population to test the performance of the process.   In case of Long term performance of a process, the data points are more and hence more noise and more deviation.  Greater deviation can be attributed to lot of factors and indicates measuring performance of a population rather than a sample. Hence Long term performance is measured differently. An anology would be the student performing well in the Annual exams.   So simple answer is population and sample size determines it
    • Long Term & Short Term Process Capability:   The Capability indices [ Cp, CpK ] & the Performance indices[Pp & PpK] can be considered as the Long Term & Short term  on the Basis of Method used to calculate Sigma, an estimate of Process Standard Deviation.   - Cp & CpK represent the Long term Process Capability, while Pp & Ppk represents the Short term Process Capability. - The AIAG suggests us that we can use PpK for a Production run of less than 30 days & CpK for everything there after can be used   - Long Term Variability = Short Term Variability + 1.5 Sigma Shift. This Interpretation is based on the underlying assumption of Six Sigma, which indicated that the Process will drift or Shift  +/- 1,5 Sigma in the Long term. When this shift is taken into account, 6 Sigma process performance equates to 3.4 ppm, otherwise 4.5 Sigma Process performance equates to 3.4 ppm.   The Main reason why the Long term Performance is calculated & treated differently is that the Long term Process capability gives out the exact output of the current running Process. It also include the Common Causes that occur during the Process & gives us the result. During the Short term process, we cannot completely analyse the entire Process & Process Capability calculated during that period, may give us a hint only about the process. So Long term Process capability is preferred for complete understanding of the Process performance & calculate the Process capability
    • I have little knowledge on the statistics and Math abilities. Chapter 3 of the precourse material is already in explaining these subjects. Are we looking for intense course material in statestics and Math when we attend the 4 day course? Will teh Exam be based on solving problems with math abilities? Can we have a sample precourse quiz to take and have a feel of the course we are looking forward to attend? Any sample questions on the Exams?  
    • Long term performance is to be treated differently compared to short term performance as there is a scope of random variations that could be introduced in the process because of several changes which could be but not limited to new employees in the process, change in measuring standards and/or any abnormalities that could have run into the process. As the scope for this to happen in measuring short term performance is less, and as there would be more number of subsets in long term(of short term), the performance could most probably come down in long run.   This is even supported with the calculations of Short and long term sigma where usually the long term sigma is a difference of short term sigma and 1.5(one point five sigma) to attain long term sigma value. 
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