Lean Six Sigma Black Belt KEY EXAM Questions
And CORRECT Answers
What is Six Sigma? - CORRECT ANSWERS Improvement methodology that uses DMAIC to
reduce variation and continually improve to perform defect free work with a failure rate of 3.4
parts per million, or 99.9997%'
What is customer feedback? - CORRECT ANSWERS The Voice of the Customer
How important are customers to quality (CTQ) outcomes? - CORRECT
ANSWERS Understanding your customers, their feedback, and prioritizing product issues.
What steps do you take to reduce poor quality? - CORRECT ANSWERS Determine internal
processes and variation; defect causes, ways to address defects, and metrics to standardize and
measure changes.
Who introduced Six Sigma and when? - CORRECT ANSWERS Bill Smith in 1986. Worked to
Motorola.
What is Sigma? - CORRECT ANSWERS Denotes variance from the mean average of an
event
What is DPMO? - CORRECT ANSWERS Defects per Million Opportunities. Event of non-
conformance to specification.
What is the defect rate for 6th, 5th, 4th, 3rd, 2nd, and 1st level of sigma? - CORRECT
ANSWERS 3.4 defects per million, 233, 6,210, 66,807, 308,538, 690,000.
, Who is the father of mass production and interchangeable equipment parts? - CORRECT
ANSWERS Eli Whitney
Why is sigma important to quality? - CORRECT ANSWERS Because understanding
deviations can help place them under control
Who is Joseph Juran? - CORRECT ANSWERS In 1954, he introduced quality concept to
Japanese factories.
When did ISO create a quality standard? - CORRECT ANSWERS 1987
How do companies save $$ with six sigma? - CORRECT ANSWERS Via reduced repair
times, increased customer satisfaction, reduced order delays, reduced defects, increased
productivity, and decreased measurement error.
Who explained that 3 sigma is bad? - CORRECT ANSWERS Walter Shewart in 1920.
Who is the father of system improvement and management? - CORRECT
ANSWERS Edwards Deming
What are the four parts of Deming's System of Knowledge? - CORRECT ANSWERS Theory
of Optimization, Theory of Variation, Theory of Knowledge, and Theory of Psychology.
What is the theory of optimization? - CORRECT ANSWERS Optimize whole system, not
each subsystem
What is theory of variation? - CORRECT ANSWERS Improve product service and variability
in design and manufacturing
And CORRECT Answers
What is Six Sigma? - CORRECT ANSWERS Improvement methodology that uses DMAIC to
reduce variation and continually improve to perform defect free work with a failure rate of 3.4
parts per million, or 99.9997%'
What is customer feedback? - CORRECT ANSWERS The Voice of the Customer
How important are customers to quality (CTQ) outcomes? - CORRECT
ANSWERS Understanding your customers, their feedback, and prioritizing product issues.
What steps do you take to reduce poor quality? - CORRECT ANSWERS Determine internal
processes and variation; defect causes, ways to address defects, and metrics to standardize and
measure changes.
Who introduced Six Sigma and when? - CORRECT ANSWERS Bill Smith in 1986. Worked to
Motorola.
What is Sigma? - CORRECT ANSWERS Denotes variance from the mean average of an
event
What is DPMO? - CORRECT ANSWERS Defects per Million Opportunities. Event of non-
conformance to specification.
What is the defect rate for 6th, 5th, 4th, 3rd, 2nd, and 1st level of sigma? - CORRECT
ANSWERS 3.4 defects per million, 233, 6,210, 66,807, 308,538, 690,000.
, Who is the father of mass production and interchangeable equipment parts? - CORRECT
ANSWERS Eli Whitney
Why is sigma important to quality? - CORRECT ANSWERS Because understanding
deviations can help place them under control
Who is Joseph Juran? - CORRECT ANSWERS In 1954, he introduced quality concept to
Japanese factories.
When did ISO create a quality standard? - CORRECT ANSWERS 1987
How do companies save $$ with six sigma? - CORRECT ANSWERS Via reduced repair
times, increased customer satisfaction, reduced order delays, reduced defects, increased
productivity, and decreased measurement error.
Who explained that 3 sigma is bad? - CORRECT ANSWERS Walter Shewart in 1920.
Who is the father of system improvement and management? - CORRECT
ANSWERS Edwards Deming
What are the four parts of Deming's System of Knowledge? - CORRECT ANSWERS Theory
of Optimization, Theory of Variation, Theory of Knowledge, and Theory of Psychology.
What is the theory of optimization? - CORRECT ANSWERS Optimize whole system, not
each subsystem
What is theory of variation? - CORRECT ANSWERS Improve product service and variability
in design and manufacturing
