One of the primary objectives of constructing an X-Y Diagram is to separate the vital few Y's from the trivial many Y's.

Question

Options

• ATrue
• BFalse

• A
  19% (6)
• B
  81% (26)

Explanation

Option B is correct because the X-Y Diagram (also called the Cause-and-Effect Matrix) is designed to prioritize X's - the input variables or process factors - based on how strongly they correlate to the Y's (outputs/responses), not to separate vital Y's from trivial Y's. The tool ranks which inputs (X's) matter most to the desired outputs, helping teams focus improvement efforts on the highest-impact variables.

Why A is wrong: Option A incorrectly attributes the "vital few vs. trivial many" purpose to the X-Y Diagram. That concept belongs to Pareto Analysis (the 80/20 rule), which is a different tool used to identify the few defects, causes, or problems that account for the majority of the effect - and it focuses on prioritizing Y-related categories, not correlating X's to Y's.

Memory tip: Think "X-Y = X drives Y." The X-Y Diagram maps inputs (X's) to outputs (Y's) to rank which X's you should investigate. When you see "vital few vs. trivial many," think Pareto - the tool named after the economist who observed that 80% of outcomes come from 20% of causes.

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