With a Fishbone Diagram we use the legs to define each source of a potential defect and along the legs we enter each potential means by which a defect could be introduced into our process.

Question

Options

• ATrue
• BFalse

• A
  94% (30)
• B
  6% (2)

Explanation

Option A is correct because a Fishbone Diagram (also called an Ishikawa or Cause-and-Effect Diagram) is structured precisely this way: the "spine" points to the effect (defect), while the major "bones" or legs represent broad categories of potential causes (e.g., People, Process, Equipment), and the smaller branches along each leg capture specific contributing factors within those categories. This two-level structure - categories on the legs, specific causes branching off them - is the defining feature of the diagram. Option B is incorrect because it contradicts the established definition and purpose of the tool; there is no alternative interpretation where this structure is inaccurate.

Memory tip: Think of the fishbone like an actual fish - the head is the problem, the big bones are your categories of cause, and the smaller bones along each big bone are the specific ways that category can cause the defect. "Bones on bones = causes within causes."

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