The 8 Wastes of Lean: Examples and How to Spot Them

The 8 wastes of Lean are the categories of activity that add cost or time to your work without adding anything the customer would pay for. Naming them matters because waste is hard to see once you are used to it. A form that gets checked twice, an approval that takes two days, a report nobody opens: none of it looks like waste from the inside. This guide gives an example of each of the eight, explains the TIMWOODS and DOWNTIME acronyms and how they relate, and covers which waste you will find most often and which one costs the most.

What counts as waste in Lean

In Lean, waste is anything that adds cost or time but no customer or business value. That is a wider definition than most people expect. It is not only scrap and rework. Waiting counts. Moving things around counts. Doing more than the customer asked for counts.

The original seven wastes come from Taiichi Ohno and the Toyota Production System. An eighth, unused skills, was added later: the knowledge, creativity and ideas an organization has but does not use.

The point of a list is not to classify neatly. Plenty of real problems sit across two categories, and it does not matter which label you pick. The point is that eight named categories give a team something concrete to look for, instead of asking them to spot inefficiency in the abstract.

Value-adding, necessary, and pure waste

Waste is the step with no customer value and no business value. That makes three groups, not two, and the difference matters before you start removing anything.

• Value-adding. The customer would recognize this step and would pay for it. Treating the patient, building the product, answering the question.
• Necessary to run the business. The customer would not pay for it, but you cannot simply stop doing it. Regulatory checks, safety procedures, required documentation. The aim here is to make these steps lighter, not to delete them.
• Pure waste. No customer value and no reason it has to exist. This is where the eight categories live, and this is what you remove.

Teams that skip this distinction tend to run into resistance quickly, because someone hears “that step is waste” about a compliance check and reasonably pushes back. Naming the middle group keeps the conversation productive: a required check is not waste in itself, but the time spent hunting for the information it needs usually is.

The 8 wastes of Lean, with an example of each

We remember them with the acronym TIMWOODS. The examples below are deliberately taken from office and service work rather than a factory floor, because that is where most of our clients live and where the wastes are harder to see.

• Transport. Unnecessary movement of materials or information. Example: moving materials between several departments before they reach the customer.
• Inventory. Excess materials, work-in-process, finished goods or information. Example: keeping more supplies or unfinished work than is currently needed.
• Motion. Unnecessary movement by people. Example: an employee repeatedly walking to another room to retrieve tools or documents.
• Waiting. People, materials, information or equipment sitting idle. Example: a team cannot continue working because it is waiting for an approval.
• Overproduction. Producing more, earlier or faster than needed. Example: producing reports before they are needed, or that nobody uses.
• Overprocessing. Doing more work, steps, approvals or processing than necessary. Example: entering the same customer information into multiple systems.
• Defects. Errors, rework, corrections, scrap or failures. Example: correcting an invoice because it contains inaccurate information.
• Skills. Not fully using people’s skills, knowledge, creativity and ideas. Example: assigning a highly experienced employee routine work while not using their expertise.

DOWNTIME or TIMWOODS?

You will meet both acronyms, and they sometimes get presented as if one is correct. They are the same eight wastes in a different order.

DOWNTIME runs Defects, Overproduction, Waiting, Non-utilized talent, Transport, Inventory, Motion, Extra processing. TIMWOODS runs Transport, Inventory, Motion, Waiting, Overproduction, Overprocessing, Defects, Skills. Two names differ between the lists: non-utilized talent is the same waste as skills, and extra processing is the same waste as overprocessing.

We use TIMWOODS in our training curriculum. But one of our largest clients in the United States uses DOWNTIME, and we teach both in class, because the acronym matters far less than whether people can walk into their own process and recognize the eight. Use whichever one your organization already knows.

The waste you will find most often

Waiting. The majority of our clients are in services, and in service processes waiting is the most common form of waste.

It is also the easiest to miss, because nobody is doing anything wrong while it happens. A file sits in a queue for an approval. Someone needs information from another team before they can carry on. The customer is waiting on a signature from a manager who is in meetings all day. None of that shows up as a mistake, and often none of it reaches the reporting either. The work simply takes longer.

The waste that costs the most

Defects, and it is not the same as the most common one. That gap between frequency and cost is the reason it is worth measuring waste rather than guessing at it.

Defects are expensive because they do not stop at the error. They cause rework, returned products, repairs and warranty claims, and in a large organization that can run into millions. This is where Six Sigma earns its place: Lean will make a process faster, but eliminating the root causes of defects is a different piece of work. Where your problem sits between speed and quality is the subject of Lean vs Six Sigma.

How to spot the eight wastes in your own process

Reading the list is not the same as finding the wastes in your own process. Three things work, in this order:

1. Go and look. Walk the workplace and watch the process where it actually happens (Go-to-Gemba). Waiting and motion are almost invisible in a report and obvious on the floor.
2. Map the process. Lay out every step from start to finish and mark which ones add value for the customer. The wastes and bottle-necks tend to sit in the gaps between steps, not inside them.
3. Ask the people doing the work. They already know where the process fights them. Ask what they wait for most often, and what they would change to make the job easier.

Going to look and asking the people who do the work both sit inside a Gemba walk. For the second, start with process mapping tools. You do not need a formal project to start any of this.

Putting it to work

Removing waste is not a one-off exercise, and the eight categories are a lens rather than a checklist to complete. Teams that get value from them build the habit of looking, usually through daily improvement and Kaizen events, and the payoff shows up across all three dimensions that matter: financial, quality and customer experience.

The Lean Six Sigma Company runs in-company group training and full deployment support across the United States. If you want your teams able to spot these eight in their own work, that is the place to start.

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