5-Why RCA: Are You Dissatisfied?
TapRooT® Changing the Way the World Solves Problems
English - September 10, 2020 14:56 - 16 minutes - 15.6 MB - ★★★★★ - 4 ratingsBusiness Technology incidentinvestigation investigation quality risk rootcauseanalysis safety taproot Homepage Download Apple Podcasts Google Podcasts Overcast Castro Pocket Casts RSS feed
We don’t find it surprising that you find 5-Whys root cause analysis lacking. The lack of effectiveness of 5-Whys RCA has been shown in simple investigations and major investigation. Even smart, well-trained users (Like Taiichi Ohno, himself) frequently jump to conclusions, follow a single root cause trail, and fail to adequately analyze the causes of human error. That’s why we find it so surprising that people still recommend 5-Whys root cause analysis because it is “easy.” Easy but wrong is the wrong answer when you are counting on your root cause analysis to save lives, stop injuries, improve equipment reliability, or stop quality issues. And there are other techniques that are easy but effective. Let’s look at one of the most famous 5-Why examples used by Taiichi Ohno), who created the 5-Why root cause analysis technique. He is quoted using the following 5-Why example to teach 5-Whys to others. Here is an example: 1. “WHY did the robot stop?” The circuit has overloaded, causing a fuse to blow. 2. “WHY is the circuit overloaded?” There was insufficient lubrication on the bearings, so they locked up. 3. “WHY was there insufficient lubrication on the bearings?” The oil pump on the robot is not circulating sufficient oil. 4. “WHY is the pump not circulating sufficient oil?” The pump intake is clogged with metal shavings. 5. “WHY is the intake clogged with metal shavings?” Because there is no filter on the pump. That’s it. The fifth WHY. Taiichi Ohno says the “Root Cause” is: “NO FILTER ON THE PUMP” Would you call that a root cause? I wouldn’t. What would the corrective action be? Probably to install a filter on the pump. What is wrong with this root cause analysis? To find out, we would have to dig deeper into the failed robot’s root causes. In our video, we will look at the three main problems with 5-Why root cause analysis and see how another technique, TapRooT® Root Cause Analysis, might produce a more thorough root cause analysis.
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