You are the best judge of what your reasonable root cause is. This is subjective and depends on your core problem. It is also possible that it took more than 5 whys for your root cause to be found. While the technique recommends asking why 5 times it may so happen, that you found your root cause before the fifth why was asked. Then repeat until we find the real root cause of the problem.īefore I conclude, here are a few points that one needs to keep in mind while using the 5 Why technique. We need to temporarily suspend our thinking of “How to fix the problem ?” and start thinking “Why is the problem occurring ?” and when we get an answer we start over again by suspending the “How to fix it” thought to think about “Why is it occurring”. This could have been avoided if we would have spent time analysing why the problem itself is happening in the first place instead of directly jumping to fix the visible symptom. Here in both the cases we took some action which would solve the problem only temporarily and the problem comes back sometimes in a more severe form or accompanied by one or more new problems. Change the oil pump drive: Doing this would have solved the problem for some time until the new oil pump drive ‘wears out’.
In the long term we would have damaged the machine by over using it in spite of it being overloaded.
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This blog goes into detail about how to effectively use 5 Whys in practice. The primary goal of the technique is to determine the root cause of a defect or problem by repeating the question “Why?” Each answer forms the basis of the next question. It is, simply put, an iterative way to discover root causes, hidden or otherwise.Ī more formal definition can be found on Wikipedia.ĥ Whys is an iterative interrogative technique used to explore the cause-and-effect relationships underlying a particular problem. In practice it is a lot subtler than that, as you will see further in this blog. 5 Whys is one of those frameworks. The definition of 5 Whys is as simple as it sounds, it is just a process of asking the question why 5 times.
Many effective solutions, methodologies and frameworks have come out from that research. Research to find solutions which prevent these tiny errors that cause cascading yet seemingly minor effects in a complex system that eventually cause it to fail. It is also a subject of lots of research across the world for the past hundred years or so. It is fascinating how something seemingly unimportant could have caused great failures. Both the poem and the proverb illustrate anecdotally how disasters happen seemingly due to innocuous causes. We all must have read the above poem or heard about the proverb “ For want of a Nail the kingdom was lost” at some point in our lives. For want of a rider, the message was lost,įor want of a message, the battle was lost,
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