
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.Please visit the forum home page at to respond to the latest question open till the next Tuesday/ Friday evening 5 PM 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. This question is based on a suggestion by Aman Kumar Jha. If both of these can be computed independently, why do we sometimes need to derive one type of sigma level from the another by using 1.5 sigma shift?

41 Sigma Level is sometimes used as a method of assessing the performance of a process. The reporting of Sigma Levels as Long Term (Overall) and Short Term (Within) has continued for a long time.
