Find the real cause of the door that keeps failing

Door C7 is found ajar three mornings in a row after the cleaning crew exits. Five Whys: ask why repeatedly until you reach a fixable cause, then test the answer with evidence. The novice move is to stop at "cleaners are careless." That may feel decisive, but it does not explain why this door, this week, at this time. Why 1 Why was C7 ajar? Because it did not latch after cleaners exited. The first why moves from condition to immediate mechanism. Why 2 Why did it not latch? The closer pulls slowly and the latch catches only if the…

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