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Seven Wastes of Lean (Muda, Mura, Muri) Reference Table

This table lists the seven wastes of lean, the commonly added eighth, and the related ideas of Mura and Muri, with a floor example and the data that usually reveals each one. Search it, then export it to Excel or PDF for a kaizen event or gemba walk.

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Waste / loss	Family	What it means	Shop floor example	ERP or MES data signal	Typical countermeasure
Transportation	Muda (7 wastes)	Moving material or product more than the process needs.	Parts travel across the plant between distant departments.	Many move transactions per work order; long routing queue-to-move gaps.	Cell layout, point-of-use storage, spaghetti diagram review.
Inventory	Muda (7 wastes)	Raw material, WIP or finished goods held beyond what the next step needs.	Pallets of WIP waiting between operations.	High days of supply, WIP value growing, slow inventory turns.	Pull system, kanban, smaller lot sizes, supermarkets.
Motion	Muda (7 wastes)	Unnecessary movement of people: reaching, walking, searching, bending.	Operator walks to a tool crib for every setup.	Labor time per unit above engineered standard with no machine cause.	5S, workstation layout, shadow boards, standard work.
Waiting	Muda (7 wastes)	Idle people or machines waiting for material, information, approval or repair.	Operator idle while waiting for a first article sign-off.	Queue time dominates lead time; downtime reason codes for material and approval.	Line balancing, andon, material replenishment, faster approvals.
Overproduction	Muda (7 wastes)	Making more, or earlier, than the customer or next process demands. Often called the worst waste.	Running a full lot to avoid a changeover while demand is low.	Finished goods above forecast; work orders closed well before ship date.	Takt time, heijunka, shorter changeovers, pull signals.
Overprocessing	Muda (7 wastes)	More work, precision or features than the customer values.	Polishing a surface that is never visible or specified.	Routing operations with no inspection or spec requirement behind them.	Value analysis, tolerance review, clear customer spec.
Defects	Muda (7 wastes)	Scrap, rework and inspection caused by errors.	Parts reworked after a wrong tool offset.	Scrap and rework quantities by work center; NCR counts; first pass yield.	Poka-yoke, standard work, root cause analysis, jidoka.
Non-utilized talent	Muda (8th waste)	Not using the ideas, skills and judgment of the people doing the work.	Operators are never asked about fixture problems they see daily.	Few improvement suggestions; high turnover in specific areas.	Kaizen events, suggestion systems, cross training, gemba walks.
Mura (unevenness)	Mura	Variation in workload or flow that creates peaks and idle gaps.	Week-end rush of orders followed by a quiet start of the week.	Spiky daily load by work center; large variation in weekly output.	Heijunka leveling, mixed model scheduling, pitch.
Muri (overburden)	Muri	Overloading people or equipment beyond reasonable capacity.	A machine run at its limit with no maintenance window.	Utilization above 100 percent of planned capacity; overtime and unplanned downtime.	Capacity planning, TPM, ergonomic design, realistic standards.
Type 1 muda	Muda classification	Necessary non-value-added work that cannot be removed yet under current conditions.	Mandatory inspection required by the customer contract.	Routing steps flagged inspection or compliance.	Reduce gradually through process capability and customer agreement.
Type 2 muda	Muda classification	Pure non-value-added work that can be removed now.	Double handling of parts because of poor layout.	Repeated moves and counts with no new state change.	Eliminate first; it is the quickest win.
Value-added work	Work classification	Work that changes form, fit or function and that the customer would pay for.	Machining a feature to print.	Run time on productive operations.	Protect and standardize; improve the ratio versus lead time.

The classic seven wastes come from the Toyota Production System. Talent is widely added as an eighth. Mura and Muri are the two other M's of the Three M's. Examples and signals are typical, not exhaustive.

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How to use the table

Filter by a keyword such as waiting, inventory or scrap to find the matching rows. Print the PDF as a waste walk sheet and carry it on the floor. For each area, tick which wastes you actually see and write the evidence next to the example. The ERP signal column tells you where to confirm what you saw with data, so the team argues about facts rather than impressions.

Why the wastes matter

Muda is any activity that consumes resources but adds no value the customer would pay for. Taiichi Ohno described overproduction as the worst because it hides the other six: excess stock covers up defects, waiting and poor flow. Mura and Muri explain why waste appears in the first place. Uneven demand creates peaks, peaks overburden people and machines, and overburden creates breakdowns and defects.

Classify each finding as type 1 or type 2 muda to decide what to attack first.
Look for the waste behind the waste: scrap is usually a symptom of method or setup.
Quantify in hours, dollars or days of lead time so findings can be ranked.

Linking wastes to ERP data

Most wastes leave a trace in the system. Inventory shows as days of supply and slow turns. Waiting shows as queue time in routing history. Defects show as scrap postings, rework operations and nonconformance reports. Overprocessing hides in routing steps with no specification behind them. Use the signal column to choose the report to pull before the workshop, and check that your transactions are posted promptly, otherwise the data will understate the problem.

Common mistakes

Teams often treat the list as a scoring contest and spend weeks classifying instead of fixing. Another mistake is attacking a visible waste such as motion while the real constraint is waiting on material. Also avoid applying waste labels to people: the waste is in the process, not the operator. Start with one value stream, fix the biggest flow problem, and revisit the table after each improvement cycle.

Frequently Asked Questions

What are the 7 wastes of lean?

Transportation, inventory, motion, waiting, overproduction, overprocessing and defects. They come from the Toyota Production System and are often remembered with the acronym TIMWOOD. Many organizations add non-utilized talent as an eighth waste, making TIMWOODS.

What is the difference between muda, mura and muri?

Muda is waste, work that adds no value. Mura is unevenness or variation in workload. Muri is overburden on people or equipment. Together they are the three M's, and reducing unevenness and overburden usually reduces waste as well.

Which waste is the worst?

Overproduction is traditionally called the worst waste because it causes the others: extra inventory, extra movement, extra handling and hidden defects. It also masks problems, since stock makes breakdowns and quality issues less visible.

Can I use this for a waste walk?

Yes. Export to PDF, print it, and use the examples as prompts while you observe a process for 15 to 30 minutes. Record what you see, estimate the time lost, and then confirm the largest items with ERP or MES data.

If your ERP already holds the routings, scrap and queue data behind these wastes, we can help you build live waste dashboards that stay read-only on your own systems.

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