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Q. 157 While solving problems, root cause analysis is considered as an obvious step. When is it that one should refer to a “cause” as the “root cause”? (or a set of “causes” as “root causes”) The most comprehensive answer wins. Do try to consider varying situations. If answers are similar in detail, those with examples will get preference over others. Note for website visitors - Two questions are asked every week on this platform. One on Tuesday and the other on Friday. All questions so far can be seen here - https://www.benchmarksixsigma.com/forum/lean-six-sigma-business-excellence-questions/ Please visit the forum home page at https://www.benchmarksixsigma.com/forum/ to respond to the latest question open till the next Tuesday/ Friday evening as per Indian Standard Time. The best answer is always shown at the top among responses and the author finds honorable mention in our Business Excellence dictionary at https://www.benchmarksixsigma.com/forum/business-excellence-dictionary-glossary/ along with the related term.
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Sensitivity Analysis
Vishwadeep Khatri posted a question in We ask and you answer! The best answer wins.
Q. 144 How does Sensitivity Analysis relate with Root Cause Analysis? Note for website visitors - Two questions are asked every week on this platform. One on Tuesday and the other on Friday. All questions so far can be seen here - https://www.benchmarksixsigma.com/forum/lean-six-sigma-business-excellence-questions/ Please visit the forum home page at https://www.benchmarksixsigma.com/forum/ to respond to the latest question open till the next Tuesday/ Friday evening as per Indian Standard Time. The best answer is always shown at the top among responses and the author finds honorable mention in our Business Excellence dictionary at https://www.benchmarksixsigma.com/forum/business-excellence-dictionary-glossary/ along with the related term. -
Q. 128 A consensus driven guess or SWAG is a part of Lean Terminology. Knowing fully well that we are taking a risk of wrong decision, are SWAGs unavoidable? Give example(s) to support your response. Note for website visitors - Two questions are asked every week on this platform. One on Tuesday and the other on Friday. All questions so far can be seen here - https://www.benchmarksixsigma.com/forum/lean-six-sigma-business-excellence-questions/ Please visit the forum home page at https://www.benchmarksixsigma.com/forum/ to respond to the latest question open till the next Tuesday/ Friday evening as per Indian Standard Time. The best answer is always shown at the top among responses and the author finds honorable mention in our Business Excellence dictionary at https://www.benchmarksixsigma.com/forum/business-excellence-dictionary-glossary/ along with the related term.
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8D Problem Solving
Vishwadeep Khatri posted a question in We ask and you answer! The best answer wins.
Q 43. While DMAIC is a more popular approach as compared to 8D Problem Solving, would you prefer to use 8D over DMAIC in some situations? Why/ Why not? Note for website visitors - Two questions are asked every week on this platform. One on Tuesday and the other on Friday. All questions so far can be seen here - https://www.benchmarksixsigma.com/forum/lean-six-sigma-business-excellence-questions/ Please visit the forum home page at https://www.benchmarksixsigma.com/forum/ to respond to the latest question open till the next Tuesday/ Friday evening 5 PM as per Indian Standard Time. The best answer is always shown at the top among responses and the author finds honorable mention in our Business Excellence dictionary at https://www.benchmarksixsigma.com/forum/business-excellence-dictionary-glossary/ along with the related term. -
Root Cause Analysis
Vishwadeep Khatri posted a question in We ask and you answer! The best answer wins.
Q2. Root cause analysis is essential to problem-solving. However, there are four possibilities - (you may watch this video to understand more - https://tinyurl.com/ybtjmnof ) A cause may be necessary but not sufficient for a problem to occur. A cause may be sufficient but not necessary for a problem to happen. A cause may be neither sufficient nor necessary for a problem to occur. A cause may be both sufficient and necessary for a problem to occur. How should our approach to problem-solving change for each of the above situations? Note for website visitors - Two questions are asked every week on this platform. One on Tuesday and the other on Friday. All questions so far can be seen here - https://www.benchmarksixsigma.com/forum/lean-six-sigma-business-excellence-questions/ Please visit the forum home page at https://www.benchmarksixsigma.com/forum/ to respond to the latest question open till the next Tuesday/ Friday evening 5 PM as per Indian Standard Time. The best answer is always shown at the top among responses and the author finds honorable mention in our Business Excellence dictionary at https://www.benchmarksixsigma.com/forum/business-excellence-dictionary-glossary/ along with the related term. -
How do you think Pareto Analysis is misused? Please remember your answer should not exceed three sentences.
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With respect to complex process improvement projects - One argument goes like this - "Most of the times, it is not difficult to find a solution to a problem. The most difficult part is nailing the root cause. If the root cause is unclear or misunderstood, the attempts at solution do not work; it just seems that the solution is so hard to find. However, if the root cause is understood precisely, the solution shall just come and sit on your lap. (or you will know soon that there is no solution if the root cause is absolutely out of your span of control)". Another argument goes like this - "In most projects, the root cause of problems are found spending lesser time and effort. It is the sustainable solution that is tough to find. One needs to try various alternative solutions and this means some sort of trials/ pilots/ benchmarking/ brainstorming/ simulations are needed. More energy therefore needs to spent in evaluating alternative solutions so that we choose nothing but the best" If you dig into your experience and think hard on this, which point of view would you support over the other?
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Fishbone Diagram or the Ishikawa Diagram is criticized for an inability to distinguish between necessary and sufficient conditions. The Ishikawa diagram merely shows causes of an event. Necessary conditions - A set of circumstance in absence of which, the event cannot occur. Sufficient set of conditions - A set of conditions which if present will ensure that the event will occur. Just to distinguish these, here is an example. Writing an exam is a necessary condition to pass the exam but is not a sufficient condition. If you are drawing a fishbone diagram for "only a few people pass an exam" - you may mention "many people do not write the exam" as one reason. This is not a sufficient condition - even if more people had written the exam, it may not have ensured that more would have cleared. In many cases, people who do not write are the people who lack confidence or knowledge. Well, this opens a room for debate. How would the necessary/sufficient distinction make our root cause analysis more useful? Please explain with an example.