![]() Why wasn’t the pump feeding enough oil? Because the intake was clogged with metal shavings.Why weren’t the gears getting enough oil? Because the oil pump wasn’t feeding enough oil.Why did the engine overheat? Because the gears weren’t getting enough oil.Why did the engine stop working? Because the engine overheated.Simple 5 Whys exampleĪ traditional example of 5 Whys root cause analysis follows a pattern like the following: ![]() The 5 Whys root cause analysis gets you to the real problem so that you can identify a real solution. Root Cause Problem Solving (RCPS) encompasses several other tools, such as Failure Modes and Effects Analysis (FMEA) and Ishikawa diagrams (sometimes called fishbone diagrams).ĥ Whys root cause analysis is a useful tool anytime that the statement of a problem does not immediately reveal its solution.įrequently, the absence of a solution is because the initial problem statement is a symptom of an underlying problem that has not been clearly identified or stated. When you use the 5 Whys root cause analysis to identify a root cause, you’re also hoping that the identification of the root cause will enable you to identify countermeasures that prevent the problem from happening again.Īs with many Lean tools, 5 Whys root cause analysis is generally believed to have evolved alongside the rest of the Toyota Production System (TPS). Then, you answer the question, then ask “Why?” again.īy the time you have asked “Why?” the right amount of times, you should have an idea about how to proceed to solve the problem.Īlthough 5 is the number in the name, it’s possible that the technique will require you to ask “Why?” a different number of times. The simple description of 5 Whys root cause analysis is that you ask “Why?” you are having a problem. In different situations, you might apply the technique to identify root causes, testable hypotheses, or to give a clear definition of a problem. ![]() 5 Whys is a Lean Six Sigma technique for refining a problem statement. ![]()
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