What is Lean Manufacturing and where did the term come from?

Last verified: 16 May 2026. Lean Manufacturing is a production methodology focused on systematic elimination of waste (muda) and continuous flow of value to the customer. The term was coined by John Krafcik in his 1988 Sloan Management Review article “Triumph of the Lean Production System,” derived from the MIT International Motor Vehicle Program (IMVP) study of global automotive plants. The methodology was popularized for Western readers in The Machine That Changed the World by James P. Womack, Daniel T. Jones, and Daniel Roos (Rawson Associates, 1990, ISBN 0-89256-350-8) and operationalized in Womack and Jones’s follow-up Lean Thinking (Free Press, 2nd ed. 2003, ISBN 0-7432-4927-5).

“Lean is the way to do more and more with less and less — less human effort, less equipment, less time, and less space — while coming closer and closer to providing customers with exactly what they want.” — James P. Womack and Daniel T. Jones, Lean Thinking, Free Press, 2003, p. 15.

Lean is the Western academic codification of the Toyota Production System (TPS) developed by Taiichi Ohno and documented in Toyota Production System: Beyond Large-Scale Production (Productivity Press, 1988, ISBN 0-915299-14-3). Per Matthias Holweg’s 2007 historical analysis in the Journal of Operations Management (DOI: 10.1016/j.jom.2006.04.001), the term “lean” was a marketing-friendly relabel of TPS that made the methodology more accessible to non-Japanese manufacturers in the 1990s. The technical content is largely the same; the framing differs.

The Five Principles of Lean Thinking

Per Womack & Jones 1996/2003, lean manufacturing rests on five principles applied iteratively:

1. Specify Value — define value from the customer’s perspective. Anything the customer is not willing to pay for is waste.
2. Identify the Value Stream — map all steps in the production process, classify each as value-adding, non-value-adding-but-necessary, or pure waste.
3. Create Flow — make the value-adding steps flow continuously, eliminating batch processing, queues, and waiting.
4. Establish Pull — produce only what the downstream customer (internal or external) demands, when they demand it. Kanban implements pull.
5. Pursue Perfection — kaizen, continuous improvement, indefinitely. Each cycle through the principles surfaces new waste to eliminate.

The five principles are sequenced — applying them out of order produces partial results. Specifying value before mapping the value stream avoids optimizing the wrong process; creating flow before pull produces overproduction; pursuing perfection without flow yields no progress.

The Seven Wastes (Seven Muda) — Ohno’s framework

Ohno 1988 Chapter 2 identifies seven categories of waste, which form the operational target for lean elimination:

1. Overproduction — producing more than required, sooner than required. Ohno’s first waste; the root of inventory waste.
2. Waiting — operator or equipment idle, waiting for material, instruction, or downstream availability.
3. Transportation — unnecessary movement of materials between operations.
4. Over-processing — doing more to the product than the customer values (excessive precision, redundant inspection, ornamental features).
5. Inventory — work-in-progress and finished goods beyond what flow requires. Ties up capital and hides quality problems.
6. Motion — unnecessary operator movement (reaching, walking, searching).
7. Defects — output that does not meet specification, requiring rework or scrap.

An eighth waste — Unutilized Talent — was added by Liker (2004) to capture the failure to engage operator knowledge and creativity. The eight-waste version is sometimes called “TIMWOODS” (Transportation, Inventory, Motion, Waiting, Overproduction, Over-processing, Defects, Skills).

“The most important objective of the Toyota system has been to increase production efficiency by consistently and thoroughly eliminating waste.” — Taiichi Ohno, Toyota Production System, Productivity Press, 1988, p. 8.

Lean tools and their position in the framework

Most operations-management terms recognizable as “lean tools” map to specific principles or wastes:

• Value Stream Mapping — implements Principle 2 (identify value stream)
• Takt time — supports Principle 3 (create flow)
• Kanban — implements Principle 4 (establish pull)
• 5S — workplace organization supporting elimination of Motion and Defects wastes
• SMED (Single-Minute Exchange of Die) — reduces setup time enabling smaller batches, reducing Inventory waste
• Poka-yoke — error-proofing devices that prevent Defects waste
• Kaizen — implements Principle 5 (pursue perfection)
• Andon — surface problems immediately, enabling rapid response to all waste categories
• Heijunka — production leveling reducing the variability that drives Overproduction

Plants that implement lean tools without the underlying principles often report disappointing results. The tools are instruments; the principles are the strategy.

Lean and OEE

OEE measurement is the diagnostic that surfaces lean implementation effectiveness. Each of the Six Big Losses (Nakajima 1988) maps to one or more of the Seven Wastes:

• Equipment Failure → Waiting waste (operators waiting for restored equipment)
• Setup and Adjustment → Waiting + Overproduction (large batches between setups)
• Idling and Minor Stoppages → Waiting waste at sub-minute granularity
• Reduced Speed → indirect, often signaling Over-processing or Motion waste
• Defects → Defects waste directly
• Startup Losses → Defects + Overproduction

The framework is consistent: TPM provides the maintenance methodology, lean provides the waste framework, OEE provides the measurement, and the Six Big Losses provide the operational decomposition. The four pieces were designed to work together.

Lean beyond manufacturing

The lean principles have been applied beyond discrete manufacturing: lean services (Bowen & Youngdahl 1998), lean healthcare (Toussaint & Berry 2013), lean software development (Poppendieck 2003), lean startup (Ries 2011). The applications adapt the value definition and waste categories but preserve the five-principle structure. The cross-industry generalizability is one reason lean has remained dominant in operations management for three decades — the framework scales to non-manufacturing contexts that TOC, Six Sigma, or pure TPS do not.

Frequently asked questions

Who coined the term “lean manufacturing”?

John Krafcik in his 1988 Sloan Management Review article, based on MIT International Motor Vehicle Program research.

Is lean manufacturing the same as Toyota Production System?

Lean is the Western academic codification of TPS. The technical content largely overlaps; the framing and terminology differ. Per Holweg 2007, the relabel made the methodology accessible to non-Japanese manufacturers.

What are the 5 principles of lean?

Specify Value, Identify the Value Stream, Create Flow, Establish Pull, Pursue Perfection. Per Womack & Jones, Lean Thinking.

What are the 7 wastes?

Overproduction, Waiting, Transportation, Over-processing, Inventory, Motion, Defects. Per Ohno 1988.

What is the eighth waste?

Unutilized Talent / Skills, added by Liker 2004 to capture failure to engage operator knowledge.

How does lean relate to OEE?

OEE measures the operational effectiveness that lean targets. The Six Big Losses framework maps directly to the Seven Wastes.

Is lean compatible with Theory of Constraints?

Yes. TOC identifies where to focus (constraint); lean identifies what to eliminate (waste). Combined approaches (Velocity, 2009) sequence them.

Can lean be applied outside manufacturing?

Yes. Lean services, healthcare, software development, and startup methodologies all apply the five-principle structure with adapted value and waste categories.

What is muda?

Japanese for waste. Used in lean terminology alongside mura (unevenness) and muri (overburden) — the three families of waste in TPS.

How does TeepTrak support lean implementations?

OEE measurement provides the lean diagnostic; Six Big Losses decomposition maps loss to waste category; the platform’s real-time visibility supports andon, kaizen events, and value stream mapping with empirical data.

References

1. Womack, J.P., Jones, D.T., and Roos, D. (1990). The Machine That Changed the World: The Story of Lean Production. Rawson Associates. ISBN 0-89256-350-8.
2. Womack, J.P. and Jones, D.T. (2003). Lean Thinking, 2nd ed. Free Press. ISBN 0-7432-4927-5.
3. Ohno, T. (1988). Toyota Production System. Productivity Press. ISBN 0-915299-14-3.
4. Krafcik, J.F. (1988). Triumph of the Lean Production System. Sloan Management Review, 30(1).
5. Holweg, M. (2007). The genealogy of lean production. Journal of Operations Management, 25(2). DOI: 10.1016/j.jom.2006.04.001.
6. Liker, J.K. (2004). The Toyota Way. McGraw-Hill. ISBN 0-07-139231-9.

Author: François Coulloudon, CEO, TeepTrak. Cross-references: OEE, Six Big Losses, Takt Time, Andon. Last verified 16 May 2026 against Womack & Jones 1990/2003 and Ohno 1988.