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Six Sigma Interview Questions and Answers

What are the different kinds of variations used in SIX Sigma?

The following are the kids of variations used in SIX Sigma:

Mean: The variations are measured and compared using the averaging techniques of mathematics. The measures are taken for a specific application and the mean is calculated

Median: The variations are measured and compared using the mid point in a given range of data. It is measured by finding the highest and lowest value then dividing it by two. The lowest value is added to the same

Range: The values of a specific data range. It is the difference between highest and lowest values in a specific data range.

Mode: Mode is the most occurred values in a given data range.

Explain Six Sigma?

The measure of variation in a process which is statistical in nature is known as Sigma. The Six Sigma process is derived if the quality is 3.4 Defect per Million Opportunities (DPMO). Six Sigma is a problem solving methodology. This methodology is applicable to a process for eliminating the root cause of defects and the costs that are associated with the same.

Who forms the part of Six Sigma implementation team?

Six Sigma implementation team has five key players:

  • Executive leaders
  • Champions
  • Master black belt
  • Black belts
  • Green belts

Executive leaders: The decision of to six sigma is taken by the main team – Executive Leaders. They promote the six sigma throughout the enterprise and ensure the commitment of the enterprise in six sigma. The executive leaders are mainly CEO, or some of the board of directors. The six sigma initiative is funded by Executive leaders. The executive leaders should be confident and determine that six sigma will improve organization process and it is succeeded.

Champions: Champions are normally the senior manager of the enterprise. He promotes six sigma mainly among the users of the business. He acts as a coach, mentor, selects projects, decides the objectives, allocates the resources and removes hurdles from black belt players. The champions fight for removing black belt hurdles.

Master Black-Belt: This role highly demands the technical capability in six sigma. All organizations are not started with six sigma and will not have the same. Normally outsiders are recruited for it. The key role of Master Black-belt is train, mentor and guide. He supports the executive leaders in candidate’s selection; teach the fundamentals and train resources and right project for resources.

Black-Belt: Black-belt always leads a selected project team for show casing six sigma. Their responsibilities include finding out the variations and looking after minimizing the variations. Black belt normally selects the projects, train resources, and they are the real implementers of the project. They are the core resources to six sigma as the actual implementation of six sigma is done by black belt, in the enterprise.

Green Belt: The green belt resources supports black belt in the functionality areas. They are part time resources who work mainly on projects for six sigma implementation. The six sigma methodologies for solving problems are applied by green belt and help for defining the basic six sigma implementation of the enterprise. The too support black belt in implementing six sigma in the enterprise.

Explain Six Sigma Levels?

It is a methodology and set of tools for the measurement of process quality. It demonstrates that the business process is well controlled. Six Sigma level can be achieved when the accuracy of your process gets only 3.4 defects per million opportunities.

Here’s the list of acceptable number of defects per million to correspond to each Sigma level:

Sigma level Defects per million opportunities

  1. 690,000
  2. 308,537
  3. 66,807
  4. 6,210
  5. 233
  6. 3.4
Explain SIX Sigma variation kinds?

Six Sigma aims to deliver quality products to the customers. It also intends to reduce output variation by predicting process results. Processes here would be measure, analyze, improve and control, Variation here means how much has the output deviated from the actual. Six sigma means as the process deviation increases the sigma number is decreased. Having the sigma number as 6 would mean that there will be no items that don’t meet with the specifications.

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