The 8 Wastes of Lean (DOWNTIME)
Quick answer: Lean defines waste as anything that doesn't add value for the customer. The eight wastes are easy to remember with the acronym DOWNTIME: Defects, Overproduction, Waiting, Non-used talent, Transport, Inventory, Motion, and Extra processing. Spotting and removing them is how lean frees capacity without spending money.
The Eight Wastes
- Defects — products or information that require rework, scrap, or correction.
- Overproduction — making more, sooner, or faster than the next step needs. Often considered the worst waste because it hides the others.
- Waiting — idle people, parts, or machines waiting for the next step, approval, or materials.
- Non-used talent — failing to tap employees' ideas, skills, and knowledge.
- Transport — unnecessary movement of materials and product between locations.
- Inventory — excess raw material, work-in-process, or finished goods tying up cash and space.
- Motion — unnecessary movement of people: reaching, walking, searching.
- Extra processing — doing more work than the customer values, like extra inspections or over-tight tolerances.
How to Hunt for Waste
Go to where the work happens and watch a full cycle. For every step, ask: would the customer pay for this? Walking, waiting, re-checking, and moving inventory rarely add value. A 5S program exposes motion and inventory waste, and a value stream map reveals waiting and overproduction across the whole flow.
Why It Pays
Most processes are far less than half value-added time. Removing waste shortens lead time, frees floor space and cash, and improves quality — usually with little or no capital. It's the engine behind nearly every lean improvement.
Frequently Asked Questions
Is it 7 wastes or 8?
The original Toyota model listed seven; "Non-used talent" was added later, giving the modern eight and the tidy DOWNTIME acronym.
Which waste should I attack first?
Overproduction often hides the others, but start where you can see the biggest, most visible drain in your own flow.
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