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| Lean (methodology) | |
|---|---|
| Name | Lean (methodology) |
| Focus | Process improvement, waste reduction |
| Originated | Japan |
| Founder | Taiichi Ohno, Shigeo Shingo |
| Time | 20th century |
| Related | Toyota Production System, Six Sigma, Total Quality Management |
Lean (methodology) Lean is a systematic approach to improving processes by eliminating waste, optimizing flow, and delivering greater value to customers. Originating in mid-20th century industrial practice, it has been adapted across manufacturing, services, healthcare, software, and public sectors. Lean draws on practices and thinkers from Toyota Motor Corporation, Ford Motor Company, W. Edwards Deming, and Peter Drucker and interfaces with methodologies such as Six Sigma, Agile software development, and Total Quality Management.
Lean traces its roots to post-World War II efforts in Japan to rebuild industry, most notably at Toyota Motor Corporation where engineers like Taiichi Ohno and Shigeo Shingo developed the Toyota Production System to compete with mass producers such as Ford Motor Company. Influential western observers and theorists—W. Edwards Deming, Joseph M. Juran, and Kaoru Ishikawa—contributed statistical quality control and continuous improvement ideas that melded with Toyota’s practices. The term "lean" gained prominence after James P. Womack, Daniel T. Jones, and Daniel Roos published "The Machine That Changed the World", popularizing Toyota-derived techniques among practitioners at General Motors, Boeing, Intel, and Procter & Gamble. Subsequent diffusion occurred through consulting firms like McKinsey & Company, Boston Consulting Group, and institutes such as the Lean Enterprise Institute and Kaizen Institute.
Core principles were codified to guide transformation. Key ideas include identifying value from the customer perspective as practiced by Harvard Business School scholars like Clayton Christensen, mapping the value stream as applied in case studies at General Electric and 3M Company, creating flow as seen in Nike, Inc. supply lines, establishing pull systems exemplified by Harley-Davidson, and pursuing perfection through continuous improvement initiatives associated with W. Edwards Deming and Kaizen advocates such as Masaaki Imai. Central concepts encompass waste categories (muda), variability (mura), and overburden (muri), along with takt time, single-piece flow, and just-in-time replenishment familiar from operations at Toyota Motor Corporation and Nissan Motor Co., Ltd..
Lean employs a repertoire of methodologies and tools adapted by organizations like Toyota Motor Corporation, Intel Corporation, Amazon (company), and Mayo Clinic. Standard tools include value stream mapping used at Procter & Gamble and Unilever, 5S workplace organization implemented in plants of General Motors and Siemens, kanban systems originating with Toyota and later employed by Spotify (company), and poka-yoke mistake-proofing techniques used in Boeing and Ford Motor Company. Other methods intersect with Six Sigma tools such as DMAIC championed by Motorola and General Electric, A3 problem solving popularized in Toyota and taught at Massachusetts Institute of Technology, rapid improvement events (kaizen workshops) used by Honda Motor Co., Ltd., and gemba walks practiced in operations at Nestlé and Pfizer. Metrics like overall equipment effectiveness (OEE) and takt time are routinely tracked by firms including Siemens AG and ABB Group.
Organizations across sectors have implemented lean practices. In manufacturing, adopters include Toyota Motor Corporation, Ford Motor Company, General Motors, and Samsung Electronics. In healthcare, institutions such as Mayo Clinic, ThedaCare, and NHS trusts have applied lean to patient flow and clinical pathways. In software and product development, lean-inspired frameworks merge with Agile software development at companies like Spotify (company), Microsoft, and IBM. Public sector implementations have appeared in programs run by agencies such as the United States Department of Defense and municipal services in New York City and London. Service industries including Marriott International and Amazon (company) use lean to streamline logistics, while financial institutions like Goldman Sachs and HSBC deploy lean for process standardization and error reduction.
Sustainable lean transformation relies on leadership and culture change. Senior executives at organizations such as Toyota Motor Corporation, Toyota Research Institute, and Intel Corporation have emphasized long-term commitment, front-line empowerment, and development of internal coaches and senseis. Practices like daily management, leader standard work, and hoshin kanri strategic deployment link executive strategy to shop-floor tactics, a model illustrated by case studies at Toyota, Danaher Corporation, and John Deere. Training programs and professional networks—offered by institutions like the Lean Enterprise Institute, Kaizen Institute, and business schools including Harvard Business School and Massachusetts Institute of Technology—support capability building and cultural diffusion.
Critiques of lean highlight potential downsides reported in studies of Boeing, Nissan Motor Co., Ltd., and hospital systems. Critics argue that excessive focus on waste reduction can lead to reduced buffers and fragility exposed during shocks such as supply chain disruptions experienced by Toyota after the 2011 Tōhoku earthquake and tsunami and by global manufacturers during the COVID-19 pandemic. Implementation failures are often attributed to superficial adoption, lack of leadership commitment, or misuse alongside cost-cutting in firms like General Motors and Ryanair. Labor organizations including AFL–CIO and Unite the Union have raised concerns about work intensification and job security. Academic commentators from London School of Economics and Stanford University have urged balanced approaches that integrate resilience, worker well-being, and system-level thinking.
Category:Management