01. The one-liner
Eight kinds of effort that quietly burn time and energy without leaving anything useful behind, in factories and in normal life.
02. Where it came from
The short history
The original list came out of Toyota in postwar Japan. Taiichi Ohno was running a factory that was tiny compared to Ford or GM. He couldn't outspend his way to market share, and Japan didn't have the raw materials to waste. So he watched. He noticed that most of what happened on a factory floor wasn't actually adding any value. Stuff was being moved. Stuff was being stored. People were walking back and forth. Defects were being fixed. Ohno's gift to the rest of us was simple. He named seven specific kinds of waste so workers could spot them. Once you can name a thing, you can fight it.
The Japanese word is muda. There were seven wastes in the original Toyota Production System. Skills was added later, in the early 2000s, by Lean practitioners who realized that underused human talent might be the most expensive waste of all. Western shorthand turned the eight into the acronym TIMWOODS, which is more memorable than it has any right to be. The whole framework is really just a checklist of things to look at, in any process, anywhere. That's why it travels so well. It's not a Toyota thing or a manufacturing thing. It's a 'how human systems quietly fail' thing.
03. How it works at work
The Belt textbook version
Pick a workflow you actually live in. A standing meeting. The way feedback travels in your team. A monthly report you produce. Walk it through the eight lenses. The goal isn't to fix anything yet. The goal is to see what's there.
Transport
Moving things from place to place without adding value. The PDF that gets emailed to Bob, who forwards it to Sue, who saves it to a shared drive, where someone eventually opens it. Three transfers. One file. Nobody changed anything along the way.
Inventory
Work sitting around waiting to be acted on. Open tickets older than 30 days. Drafts in your team's Notion. Approvals stuck in someone's inbox. Inventory isn't evil. Too much of it is just buried potential, and it quietly stresses everyone who walks past it.
Motion
People moving around the system more than they need to. Hunting for the doc. Tab-switching to find which Slack channel had the answer. Asking three people before finding the one who knows. Hours a week, often invisible.
Waiting
Idle time you can't actually use because you're waiting for input, an answer, a sign-off, the meeting, a decision. Most knowledge work is mostly waiting if you look at it honestly. The waiting just hides inside calendar blocks marked 'work.'
Over-production
Making more than's needed, or making it before it's needed. The 40-page deck for a 15-minute meeting. Five A/B tests when one would have answered the question. Five quarterly priorities when the team can really only ship two.
Over-processing
Adding more steps than the work actually requires. The four-stage approval for a change nobody else cares about. The brand review for an internal Slack post. Three rounds of editing on a draft that was already good after one.
Defects
Things that have to be redone. Bugs in shipped code. Reports with the wrong numbers. Decisions made on outdated information. The cost isn't just the rework. It's also the trust the next person loses in the system, which is harder to put back than to break.
Skills
People doing work that doesn't use what they're actually good at. Senior engineers in expense-report rabbit holes. Designers writing meeting notes. The newest hire being asked to write the strategy. Underused skill shows up in everyone's vibe before it shows up in any metric, which is part of why it's so expensive.
04. How it works in real life
The secret self-help version
Same eight things. Different setting. Look at a normal week of your life and almost anything that isn't living, working, or resting (the three things that actually matter) is hiding in one of these buckets.
Transport
Driving to three different stores in one afternoon when one well-made list would have caught everything in a single stop. Carrying the laundry up and down twice because you forgot the basket. The route to the bathroom that goes around the kitchen island for no reason except that's how you've always gone.
Inventory
Frozen meals you'll never eat. Browser tabs open for three weeks. Half-read books on the nightstand. Streaming watchlists in the hundreds. The pile of 'I'll deal with that later' that quietly follows you around the house.
Motion
Walking to the kitchen for coffee, the cup, and the milk, in three trips. Searching for your keys every morning. Mental motion counts too. Re-reading the same paragraph because your phone buzzed, then reading it again because you forgot what it said.
Waiting
On hold. In a queue. For the kettle. For the kids to finish getting ready. For a return email so you can do the next thing. Most schedules are 30% actual doing and 70% waiting nobody planned for.
Over-production
Cooking dinner for six when there are three of you. Doing the laundry on Tuesday and again on Saturday because you can't remember which clothes are clean. Saying yes to four social plans in a weekend when one was the right answer.
Over-processing
Three drafts of a text message to a friend. The eight-step skincare routine your face doesn't need. Color-coding a calendar that nobody else looks at. Effort that has no payoff except the small, brief feeling of being on top of it.
Defects
Burnt dinner. Sent the message to the wrong person. Forgot the birthday. Missed the bill that turned into a fee. Mistakes happen. The full cost is the redo, plus the apology, plus the small hangover of having to clean up the wake.
Skills
You're a strong thinker and you spend your Saturdays moving boxes. Your partner is the better cook and you make every meal. Underused skill in a household does what it does at work. Resentment, then disengagement, then a quiet slide. Watch for it.
05. The assignment
Time
20 minutes, spread over one day
What you need
A small notebook. A pen. Keep them on you.
The exercise
Pick one ordinary day. Every time something irritates you, however small, write it down right then. The line at the coffee shop. The doc you can't find. The third interruption in five minutes. At the end of the day, sit with the list (paper, not screen) and label each item with a letter: T, I, M, W, OP1, OP2, D, or S. Don't try to fix anything. The labeling is the whole exercise.
Then
You'll almost certainly find that one or two wastes dominate the list. That's where your leverage is. Solving the dominant waste removes more friction than fixing five small unrelated things, which is why this is the most practical 20 minutes you'll spend on yourself this month.
06. The honesty check
Explain it to a 12-year-old
There are eight ways things get wasted: moving stuff that didn't need to move, having too much of something, taking extra steps, waiting, making too much, doing too much, making mistakes, and not using what people are actually good at. Almost everything annoying is one of these. Naming the one you're stuck in makes it much easier to fix.
If you can't say it this way, you don't quite have it yet. That's one of the rules of this site.