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Here is another example of 5 Why, this time in a restaurant.

Here is another example of how to use the 5 Whys, this time in a service environment.  For example, in a restaurant, the symptom is a customer complaining about the waiting time.  Unfortunately, the way many people would fix this is by apologizing to the customer and make sure that he or she gets the food as fast as possible.  What is the problem?  What is the root cause of the problem?

Remember our friends from Yummy Broth?  They are a small restaurant specialized in soups, but they also served salads and sandwiches.  One day, not one or two, but four customers were complaining about the service.  The truth is that the food was not arriving in a reasonable amount of time, and the front-end supervisor was concerned.  They managed to get food in front of the customers to fix the immediate problem.  The manager does not want this to happen again.  She knows how to use 5 Whys, so next day during their stand-up meeting, she went ahead to analyze the root cause of the situation.

For this problem, probably most people will choose to expedite the food for the complaining customers, a second group would try to find a root-cause and will stop with the third or the fourth why.  Only if you keep digging, will find that the root cause is that there is no standard work.  Even if team members want to help, they could not do the right thing because there is no instruction to do the work.  Without a standard, effective cross-training is not possible.  At least the manager knows better and keeps asking why until the real reason was uncovered.  Now, she should be creating that standard work with the team to organize cross-training.

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What is Root Cause Analysis?

Root Cause Analysis

Many times, when a problem happens, actions are taken to fix it without knowing what the problem is. To avoid that, PDCA gives a structure for the problem-solving process.

Understanding the problem is critical for the success of PDCA, and knowing the root cause is an important piece. Without identifying the underlying cause, it is impossible to implement corrective actions that prevent a recurrence. If all we need to stop a problem from repeating itself is find the root cause, why we keep fighting with the same situations?

Root cause analysis (RCA) is one of those things that is easier said than done. While it is not complicated, finding the root cause requires patience, attention to detail, and the ability to look at things from different perspectives. RCA is a structured process for identifying the most basic causal factor(s) that if corrected or removed will prevent recurrence of an undesired outcome.

It is common to engage in finding a solution when the situation is almost out of control. At this point, patience is out of the picture you want to see fast results. RCA requires persistence to keep asking why that happens until finding the end cause. If you stop digging before finding the most basic cause, the process fails. You end up working with the physical cause, which is a symptom or a proximate cause.

A proximate or physical cause is the source of the symptoms that you see as the problem. Recommendations to fix this type of cause are corrective actions, but they do not prevent a recurrence.

To have different points of view of the situation, brainstorm ideas with the affected members of the team. Create a blame-free, safe environment where people can talk honestly. Encourage thinking out of the box, and asking why to find buried reasons.
Root causes are specific basic causes that management has control to fix and develop effective recommendations to avoid recurrence. For example, human error is not specific. Why the person errs? There is another uncover reason like, Is the work instruction clear? Is it complete? Is there any distraction that affects performance? An example of something you cannot control is the weather. Because you cannot control the weather, it is necessary to keep digging what reason is hiding behind weather conditions.

The goal of RCA is to identify one or two reasons, that, if corrected will reduce recurrence. Tools like fishbone or the 5 Why facilitate this process. The rule of thumb is that if there are three or more root causes, you can assume the root cause has not yet been found, and you need additional investigation. In summary, keep digging!