Six Sigma (6σ) is a set of techniques and tools for process improvement. This data-driven and disciplined methodology can be used in any processes from manufacturing to transactional and from product to service. It was first introduced by Bill Smith while he was working in Motorola in 1986 and over the years it has gained popularity in different industries and sectors for business improvement.
There are a lot of advantages in using Six Sigma and its positive effects have been the driving force in the effective functioning of many businesses. This is the reason why Six Sigma professionals are still in great demand in various industries. If you are appearing for a Six Sigma job interview, the following commonly asked questions (with answers) will help you to be well prepared.
#1. What is COPQ in Six Sigma ?
Cost of Poor Quality (COPQ) is the cost caused through producing defects.
#2. Cost and Savings in Six Sigma ?
In the world of Six Sigma quality, the saying also holds true: it takes money to save money using the Six Sigma quality methodology. You can’t expect to significantly reduce costs and increase sales using Six Sigma without investing in training, organizational infrastructure and culture evolution.
#3. Name some of the Quality Management Tool in Six Sigma
There are a number of quality management tools. Some of them are cost-benefit analysis, CTQ Tree, SIPOC analysis, COPIS analysis and Taguchi methods.
#4. Who forms part of the Six Sigma Implementation team ?
The Six Sigma implementation team usually consists of the following members:
- Six Sigma Deployment Leader
- Six Sigma Champion
- Six Sigma Master Black Belt (MBB)
- Six Sigma Black Belt (BB)
- Six Sigma Green Belt (GB)
- Six Sigma Yellow Belt (YB)
#5. What is the difference between Six Sigma DMAIC and DMADV ?
The DMAIC methodology, instead of the DMADV methodology, should be used when a product or process is in existence at your company but is not meeting customer specification or is not performing adequately.
The DMADV methodology, instead of the DMAIC methodology, should be used when:
- A product or process is not in existence at your company and one needs to be developed
- The existing product or process exists and has been optimized (using either DMAIC or not) and still does not meet the level of customer specification or Six Sigma level
#6. What is the difference between Cpk and Ppk ?
Cpk is process capability index, which measures how close a process is running to its specification limits, relative to the natural variability of the process and Ppk is process performance index, which verifies if the sample that have been generated from the process is capable of meeting Customer CTQs (requirements).
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