The "Equipment" category of Root Causes on a Fishbone Diagram would be used primarily used to generate ideas as to which of the following are possible causes for defects?

Question

Options

• AOut of calibration measurement system
• BTolerance changes in milling machines
• CWorn bearings on a shaft
• DAll of these answers are correct

• A
  6% (1)
• C
  6% (1)
• D
  88% (14)

Explanation

All three options - A, B, and C - are legitimate examples of equipment-related root causes, which is precisely why D is the correct answer. The "Equipment" (or "Machine") category on a Fishbone Diagram encompasses any physical device, tool, or instrument involved in the process: an out-of-calibration measurement system (A) represents faulty measurement equipment; tolerance changes in milling machines (B) reflect mechanical degradation in production machinery; and worn bearings on a shaft (C) indicate physical wear in equipment components. None of A, B, or C individually is wrong - the question is testing whether you recognize that all three belong to the same Equipment category rather than getting tricked into choosing just one.

Memory tip: Think of "Equipment" as anything you can physically touch that does work or measures work - if it has moving parts, needs calibration, or wears out over time, it belongs in the Equipment branch of your fishbone.

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