Muda is the Japanese word for waste, and in the Toyota system it has a precise meaning: any step that uses time or effort without adding what the customer wants. Taiichi Ohno, who built the system, named seven kinds. They are taught in every factory in the world and almost never applied to a kitchen, which is odd, because a kitchen is where most people do their most repetitive work.
The seven are not about money. They are about motion, and they translate.
The seven, translated
Overproduction: making more than is needed now. Cooking rice for four days and throwing out two. Buying the large size because it is cheaper per gram and finding half of it in the bin.
Waiting: time spent stopped because something else is not ready. Standing at the kettle. Standing at the microwave. Waiting for the pan to heat because it was put on after the chopping, not before.
Transport: moving things that did not need moving. Carrying the bin bag through three rooms because the bin is far from the door. Bringing the shopping to the kitchen in four trips because there is no place to set it down.
Over-processing: doing more to a thing than is needed. Washing a vegetable that will be peeled. Ironing what will be folded. Wrapping the leftover twice.
Inventory: things held that are not being used. The third spatula. The spice bought for one recipe in 2023. The drawer of takeaway sauce.
Motion: movement of the body that does not produce anything. The tool four steps too far. The cup on the high shelf. Opening three drawers to find the one thing.
Defects: work that has to be redone. The burnt pan. The forgotten ingredient. The dish washed twice because it was stacked wet.
The practice
Pick one room and one week. Each day, name one muda from the list. Not fix it. Name it, and write down which of the seven it was.
By the end of the week there will be five or six, and most people find that they cluster: three motions, two inventories. That cluster is the finding. It says which kind of waste this room produces, and that is the kind worth fixing first.
Then fix one. The tool moved. The spatula given away. The pan put on before the chopping. One, in the kaizen way, and see what it does to the others.
What people notice
The first is that naming is enough to begin with. A muda seen is half removed, because the next time it happens the eye catches it, and the hand tends to go a different way without being told.
The second is that the categories argue with each other. Inventory is often the fix for waiting: the second kettle, so nobody stands. Overproduction is often the fix for motion: cook twice as much so the pan comes out half as often. Ohno’s seven are not a list of sins. They are a set of trade-offs, and the practice is finding the one that costs least here.
The third is that the word leaves the kitchen. After a week, the commute has muda. The inbox has muda. The meeting has all seven. That is the system arriving where it was always meant to go.
Where this fits
The kaizen guide covers the method: one small improvement, repeated. The sink practice is one week of one question. This is the vocabulary that question uses, and the reason kaizen has seven answers rather than one.
A free seven-day log. The Kaizen Friction Log is a seven-day version of this practice: one line a day for the obstacle that shows up most, whichever of the seven it is. You get it by email, free. → Get the free log
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This article is part of a series exploring Japanese philosophy and intentional living: