The 8 wastes — Defects, Overproduction, Waiting, Non-utilisation of talent, Transportation, Inventory, Motion, and Extra Processing — are the categories that structure waste identification in lean. Most teams can name them. Fewer can identify them specifically on their own floor and build an actionable elimination backlog from what they find.
The original seven wastes were identified by Taiichi Ohno at Toyota in the development of the Toyota Production System. The eighth — non-utilisation of talent — was added later as lean thinking spread beyond manufacturing to knowledge work environments. Together they form a complete taxonomy of non-value-adding activity that applies across industries and processes.
The purpose is not to categorise waste for its own sake. The purpose is to give teams a structured lens for seeing waste that would otherwise be invisible — because waste that has existed long enough becomes the background, the way things are.
Any output that does not meet specification and requires rework, scrap, or inspection.
Defects consume labour twice — once to produce and once to correct. Scrap consumes material with zero customer value. Rework delays shipment and erodes confidence in the process.
Producing more than the customer requires, sooner than required, or faster than downstream can consume.
Overproduction is the worst waste because it creates all the others — it generates inventory, requires transportation, hides defects, and ties up capacity that should respond to actual demand.
Time when work — product, people, or information — is idle and not progressing through the process.
Waiting is often invisible because the product is still in the building and the operator may appear busy with other tasks. But it is the primary driver of long lead time and low PCE.
Failing to use the knowledge, skills, creativity, and experience of the people doing the work.
Often called the 8th waste because it was added to the original 7 after Toyota codified the others. The knowledge gap between what workers know and what management acts on is enormous in most organisations.
Moving product, material, or information that does not add value to the transformation.
Every move is an opportunity for damage, loss, delay, and labelling error. Transport also obscures the sequence of operations — when parts travel, the process is harder to see and manage.
More material, WIP, or finished goods than is needed to support current demand.
Inventory ties up cash, occupies space, and hides problems. When a quality issue is discovered in 500 units of WIP, the cost is exponentially higher than discovering it in 5. Inventory is the buffer that makes all other wastes tolerable — and therefore invisible.
Unnecessary movement of people that does not add value to the product.
Motion waste is the most visible waste on a properly run time study — and the most ignored. It accumulates in seconds per cycle, but at 480 cycles per shift, minutes per hour become hours per week.
Doing more to a product than the customer requires, or using a more complex process than the task demands.
Extra processing consumes capacity without producing value. It often originates in well-intentioned process additions that were never revisited — the inspection step added after a quality escape ten years ago, still running on every part.
Identifying waste is only the first step. The output of a waste identification exercise should be a prioritised backlog of specific observations — not "we have inventory waste" but "there are 4.2 days of WIP between Station 3 and Station 4 due to the batch size mismatch, and reducing it to 0.5 days would save 14 hours of lead time."
VeSiMy's Waste ID tool walks through all 8 wastes per process step. For each waste you identify, you add a specific observation note. These roll up automatically into the project report as a prioritised waste register — so the output of the waste walk is a Kaizen backlog, not just a list.
VeSiMy's Waste ID tool covers all 8 wastes per step and builds your improvement backlog automatically.
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