Yield and quality control

Which technique digs into a problem by repeatedly asking 'why' to find its true cause?

  1. APareto analysis
  2. B5 Whys analysis
  3. CHistogram
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Answer: B. 5 Whys analysis

5 Whys analysis asks why a problem occurred, then asks 'why' again of each answer, tracing past superficial causes to the root cause. It is used when devising measures to prevent recurrence.

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More Yield and quality control questions

  1. A wafer has 600 chips and the yield is 80%. How many good chips are there?
  2. If wafer process yield is 95% and wafer test yield is 90%, approximately what is the overall yield obtained by multiplying them?
  3. What is the system called that tracks each product's manufacturing history, needed to identify products that may have been affected when an abnormality is found?
  4. Which technique rejects chips that are within specification in test but show values far outside the distribution of the same lot?
  5. Which correctly describes the difference between the control limits of a control chart and a product's specification limits?