Six Sigma Green Belt

Given below are some of the important interview questions on Six Sigma Green Belt (SSGB) asked by interviewers. Checkout them if you are looking for a job in Quality Management.


Q.1 How should you decide on the projects and their issues?
You are required to mention about VOC or VOP. VOC should be given by the clients or customers by reactive feedback or by conducting survey or the customer's ratings to the process. Using this approach, you can find the criteria as customer's dissatisfactions towards the products or services.
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Q.2 What is project scope?
The project scope is used to make boundaries for the project so that team should keep their focus inside of the boundary and anything beyond boundary is not questionable for the projects. Such that boundaries can be limited to one process, location, people and time durations.
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Q.3 How will you define the problem statement?
The problem statement to be defined should be clear and crisp. Also problem statement should be defined in metrics such that it is easier to make the stakeholders understand in case the problem has not been resolved, also the future consequences also should be shared with stakeholders.
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Q.4 What is Pareto chart
Pareto Chart is one of the most popular tool used in six sigma and quality management. You are suggested to describe the Pareto analysis to prioritize the issues, or causes and define each and every aspect of the Pareto chart. Also you must specify the data points needed for Pareto, cases if Pareto ratio 50:50. Giving all the information indicates that you are clear about each aspect of Pareto. Also you must describe hypothesis testing as this is one of the most critical part. We need to see also, the hypothesis tests performed, their implementation, significance of these tests, need for regression. You need to give complete information with testing results and what has been observed in the tests.
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Q.5 What is the Ishikawa diagram?
Ishikawa diagram also referred as cause and effect diagram or fishbone diagram. Primarily cause and effect diagram or Ishikawa diagram, is a visualization tool for categorizing the potential causes of a problem in order to identify its root causes.
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Q.6 What is the primary use of COQ?
COQ is primarily used to understand, analyze & improve the quality performance. COQ can be used by shop floor personnel as well as a management measure. It can also be used as a standard measure to study an organization’s performance vis-à-vis another similar organisation and can be used as a benchmarking indices.
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Q.7 How does the VOC information be gathered ?
Gathering VOC information can be done by direct interviews of customers like site intercepts, personal interviews, focus groups, customer feedback forms, or structured online surveys and indirect interviews with representatives like sales people or customer service representatives, who interface with the customer and report on their needs.
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Q.8 Which waste elimination technique focus on organizing the workplace?
5S is a discipline for creating and maintaining a clutter- free, clean, organized safe and high - performance workplace in 5 steps, which are seiri, seiton, seiso, seiketsu and shitsuke.
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Q.9 What will be the coefficient of correlation for two variables linearly related as y=2x?
It is provided that two variables are linearly related as y=2x, hence, for every value of x, y is twice of that. Thus, a positive correlation coefficient is obtained and for every given value of x, the resultant correlation coefficient will be +1
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Q.10 Which IDOV phase uses CTQs for calculating the tolerance level of a selected business process ?
Optimize phase uses CTQs for calculating the tolerance level of a selected business process by simulation tools. It predicts the performance capability of a business process, optimizing existing design and developing alternative design elements.
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Q.11 Which bar chart that depicts the frequencies of numerical or measurement data?
Histogram shows frequencies in data as adjacent rectangles, erected over intervals with an area proportional to the frequency of the observations in the interval. They are frequency column graphs that display a static picture of process behavior and require a minimum of 50-100 data points. It is characterized by the number of data points that fall within a given bar or interval or frequency.
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Q.12 What is a “Tree Diagram”?
A chart where a concept is successively broken down into sub concepts with increasingly higher levels of detail.
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Q.13 What is the role of Process Owner in a six sigma project?
The role of Process Owner in a six sigma project is : 1. They are required to provide the inputs at the beginning of the process. 2. They are expected to work in close co-ordination with the Project lead & validate the requirements that have been gathered. 3. They are supposed to be in charge of the improved six sigma process.
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Q.14 What is the purpose of Piloting the solutions?
The purpose of Piloting the solutions is to assess the impact of the solution in a control group setting; based on the qualitative and quantitative results, necessary alternations can be incorporated to the final solution.
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Q.15 Which phases utilizes DOE technique under DMAIC?
Improve phase ses tools like Design of Experiment (DOE). It is aimed only on making the improvement like improving the designing, testing and implementing of the solution. It involves enlisting statistically proven results from active study or pilot, creating the improvement plan, updating the stakeholder assessment, revising the business case with investment ROI, risk assessment and adding new process capability.
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Q.16 List non-parametric tests in a Six Sigma Green Belt project
Regression, 2 tailed 2 sample t-test and ANOVA are non-parametric tests
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Q.17 Which of the following is an effective technique used in a the define phase of a Six Sigma Green Belt project: Affinity diagram, Control chart, FMEA or Data collection checklist
A control chart is an effective technique compared to rest, for the define phase of a Six Sigma Green Belt project.
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Q.18 List a prioritization tool in a Six Sigma Green Belt project
Multi-voting is a most effective prioritization tool for Six Sigma Green Belt project.
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Q.19 What are the steps for data collection for a Six Sigma Green Belt project
Data collection for a Six Sigma Green Belt project depends upon the factors affecting the output function Y=f(x) which determine the data to be collected for the six sigma green belt project.
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Q.20 What do you mean by MSA in a Six Sigma Green Belt project
MSA refers to Measurement System Analysis which, refers to the analysis performed for verifying the measurement system for various parameters like accuracy, etc.
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Q.21 What does Gauge R & R means in a Six Sigma Green Belt project
The R & R expands to repeatability and reproducibility. The Gauge R & R is used to find the difference amongst the reproducibility and repeatability.
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Q.22 What is Normal distribution in a six sigma green belt project?
The normal distribution or bell curve has data being centered around a central value without any bias. It is characterized with value of mean, median and mode being the same and has symmetry about the center with 50% of values less and greater than the mean.
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Q.23 Calculate the mean and standard deviation for normally distributed data if 95% of policemen being 1.1m to 1.7m tall.
The Mean is: (1.1m + 1.7m) / 2 = 1.4m and 1 Standard deviation is = (1.7m-1.1m) / 4 = 0.15m
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Q.24 What is Process Capability for a process in a six sigma green belt project
Process capability is the measurement of a process's ability to output but within the specified limits consistently.
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Q.25 What does Pareto Principle refers to
The Pareto principle is also known as 80/20 rule and it states that 80 percent of the outcomes are due to 20 percent of causes.
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Q.26 What is meant by standard deviation
Standard deviation is the amount of variation of a set of values and a low value indicates data values are closer to mean and higher value indicates that data values are spread over a wide range.
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Q.27 Explain process sigma calculation
Process Sigma indicates variation in a process against the requirements and is expressed as a number of standard deviations on a normal distribution.
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Q.28 What is Regression?
Regression analysis shows the strength of relationships amongst a dependent variable and independent variable. It shows trends amongst two sets of data.
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Q.29 Explain FMEA
FMEA expands to failure mode and effects analysis, is an analysis technique to predict failures in a process or product and, prioritize failures as per probability and impact.
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Q.30 Illustrate the X bar and R charts and their utility in a six sigma green belt project.
The X bar and R charts are control charts for processes having 2 or more subgroups. The X-bar chart displays changes in mean over time and the R chart displays changes in the range of the subgroups over time.
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Q.31 What is brainstorming and its utility in six sigma green belt project
Brainstorming is a group technique involving group of people to contribute ideas for solving a problem.
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Q.32 What is Lean Six Sigma
Lean Six Sigma involves combining lean and six sigma techniques to reduce waste and variations from a process or product.
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Q.33 Describe VSM
VSM or Value Stream Mapping is a technique to visualize all steps of a process to highlight the value-adding and wasteful steps.
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Q.34 What is takt time
Takt time refers to time taken for meeting the customer demand vis-à-vis production i.e. product creation speed needed for fulfilling the customer demand. Its calculated by the formula: Time Available for Production/Customer's Daily Demand
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Q.35 Explain an affinity diagram and its use in a six sigma green belt project
An affinity diagram organizes ideas as per their affinity or similarity and their relationship. It is a creative group technique about a product, process or problem.
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Q.36 What is a control chart in a six sigma green belt project
Control chart analyzes process changes over a time period. It is a time series graph with horizontal line visualizing trends with UCL (upper control limit) and LCL (lower control limit)
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Q.37 Differentiate between a Histogram plot and Box plot
A histogram plot shows the distribution of the data whereas a box plot compares multiple data sets with lesser space and details.
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Q.38 Differentiate amongst the control and run chart
A run chart displays single data group variation over time to show trends in the process and process shifts. A control chart is similar to run chart but has UCL and LCL with a centreline and confirms if process is under control or going in correct direction or output is within limits.
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Q.39 Which statistical test verifies that the means is between 2 inter-related groups
The paired t-test verifies the means being in between the two inter-related groups.
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Q.40 What is the use for the 5S methodology in a six sigma green belt project
5S is a lean technique to create and maintain a safe, clean and efficient workplace by eliminating wastes.
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Q.41 What is OEE in six sigma
OEE expands to Overall Equipment Effectiveness measures if planned production time being productive or how fast production with no downtime, produces the required goods. It is calculated as: (Good Count or goods without defects× Ideal Cycle Time)/ Planned production time
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Q.42 Which technique is used for equipment effectiveness
The total productive maintenance (TPM) is used equipment effectiveness
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Q.43 What is a Fishbone diagram
It is a problem-solving technique involving a diagram similar to a fish skeleton to know the reasons for defects in a process or product. The diagram has problem at the head and the causes link into the spine. It is also called as Ishikawa diagram or cause and effect diagram
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Q.44 What is QFD
QFD expands to Quality function deployment used to transform customer requirements from voice of customer to product or service specifications.
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Q.45 Which of the following is performed first in Measure Phase: Stability, Capability, MSA or Normality
The MSA (measurement system analysis) is to be performed first in Measure phase.
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Q.46 Which of the following is ascertained first in MSA GAGE RR study for the Measurement System: Accuracy, Stability, Resolution or Linearity
Accuracy is ascertained first in MSA GAGE RR study for the Measurement System
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Q.47 What does the define phase in DMAIC determines in six sigma green belt project
The define phase of DMAIC determines all elements of the project like business opportunity, key problem areas, resources, and starting the project charter.
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Q.48 Define Poka-yoke
It is a Japanese term meaning, mistake proofing, and involves using automatic device or designing device to make it impossible for an error to occur or immediately obvious if it occurs. For example USB cable will connect in a specific direction into a USB port.
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Q.49 List the matrix diagram which shows relationship amongst 3 groups in a circular motion.
The Y-type matrix diagram displays relationship amongst 3 groups in a circular motion.
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Q.50 What is the count of opportunities which lie outside the specification limits in a 5 sigma level process?
233 opportunities lie outside the specification limits
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