Lean is like eating an apple. There’s the skin that we all see-it has a color, a texture, and a stem. However, once you break through the skin with your teeth you see a different color, texture, and the core. This is the same principle in Lean and problem solving through the use of the five why’s.
You’re given a scenario (the skin), you see the results of the problem (the color), you see the repercussions of the results (the texture), and you may even see a sliver of the actual problem (the stem). Yet, until you sink your teeth into the scenario you won’t truly see what’s underneath. By taking a bite you slowly begin revealing a new color, a new texture, and eventually the core, or in this case the root cause.
For a moment let’s pretend that it only takes five bites to get to the core of the apple. Each bite represents one of the five why’s.
Imagine a woman who cuts off the ends of a ham before putting it in the oven. Her husband asks “Why do you cut the ends off of the ham before cooking it?” *Bite* She replies, “because it’s how my mother cooked it.” So the husband goes to his mother-in-law and asks, “why do you cut off the ends of the ham before cooking it?” *Bite* She replies, “because it’s how my mother always made it.” So the husband goes to the grandmother and asks why she cooked ham this way *Bite* here he got the same answer that he got from his wife, and his mother-in-law. Finally, he asks the great grandmother “Why have you always cooked your ham without the ends on?” *Bite* She replies, “so I could cook as much ham as possible,” the husband then asks, “why couldn’t you cook the whole ham at once?” *Bite* and she replies, “because the pan I had was too small.”
For generations, the women thought this was how they were supposed to cook a ham simply because their mother before them had cooked it that way, but not once did they stop to recognize that there may be an underlying method to their madness. Over the years this resulted in much ham, time, and money wasted for no real reason.
By asking ourselves five why questions we allow ourselves to get to the root cause. Now, if the husband had only asked four why questions, his last answer would’ve been, “so I could cook as much ham as possible,” this really wouldn’t have answered his question-it would’ve gotten him closer but not to the root cause. The same is true with eating an apple-by taking few too little bites you don’t ever the see the core, all you recognize is the apple in your hand. However, if you take another bite you may just find the seeds, and your perspective and appreciation for the apple in your palm has changed.
*Note: The example of the ham is one that was introduced to me by Daniel Bennett of Public Safety and Police Services here at MTU.
What are some areas of waste around you? Have you properly identified the root cause? If not, try utilizing the ‘5 why’s” they may be able to help you find a problem you didn’t originally see.