RCA tool picker
Recall which RCA tool fits which common investigation need.
Narrow vs broad Five Whys or fishbone? Use fishbone for breadth, Five Whys for depth. Objection handler Let's run Five Whys on every defect category. Say this First, let's Pareto the categories so we deep dive the highest-leverage defect. Spreading RCA effort evenly across uneven problems. Pareto helps choose the target before cause analysis begins. Signal check When do you use a control chart? When you need to know whether process variation is stable or shows a special-cause signal. Do this before inventing a root cause for one high or low point. Leadership pressure We do not have time for…
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