Yield and quality control

Which diagram organizes the relationship between a problem (effect) and the factors that influence it in a shape like a fish skeleton?

  1. APareto chart
  2. BHistogram
  3. CCause-and-effect diagram
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Answer: C. Cause-and-effect diagram

A cause-and-effect diagram places the problem (effect) at the right end and writes the factors affecting it as branches, grouped into categories such as people, machines, materials and methods; from its shape it is also called a fishbone diagram. It is one of the seven QC tools and helps identify the causes of defects without omissions.

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More Yield and quality control questions

  1. What is the main purpose of analyzing wafer maps, which show wafer test results as pass/fail for each chip position on the wafer?
  2. With all else equal, about how many times larger does wafer area become when wafer diameter is increased from 200 mm to 300 mm?
  3. In a control chart, which is an example that should be judged abnormal even though all points are within the control limits?
  4. In the Poisson model Y = exp(−D × A), with defect density D = 0.1 /cm² and chip area A = 1 cm², approximately what is the yield?
  5. Among defects on a wafer, what are those called that actually cause electrical failure of a chip?