Lean management was neither created in a day, nor only at Toyota. Here is a history of Lean management and how it has evolved from Henry Ford to today.
1913 - Henry Ford
The story of Lean really begins with Henry Ford who set up a very productive organization around the "Flow" that started with raw materials and ended when the customer left with his car. Ford was the first to actually implement some of the following Lean concepts (before the word Lean was invented).
Standardisation: standardization of product models, associated parts and also production tasks
Reduction of wastes: in particular operator movements by minimizing the number of tasks to be performed
Just in time: Ford worked on its Supply Chain to get the right amount of materials and parts according to demand
The main criticism made to Ford is that its production process was only dedicated to manufacturing a single product model and did not allow any variation.
1924 - Toyoda
Sakichi Toyoda, who founded Toyoda Loom Works, manufacturer of weaving machines, developed a loom that automatically stops when a yarn breaks: he had just invented the concept of "autonomation", which allows the operator to no longer be directly linked to a machine and can supervise several machines; this concept introduces the notion of the human being into the production process, which is one of Lean's fundamentals.
1937 - 1962 The Toyota Production System (TPS)
1937 - Kiichiro, son of Sakichi, created the automotive division of Toyota Loom Works
Toyota first adopted certain production methods from Ford, as well as "autonomation", but various production problems and Sakichi's passion for process improvement led him to develop methods based on the reduction of wastes (categorized in muda, muri and mura) and on the establishment of "kaizen" workshops.
1945 - Very difficult post-war context in Japan
After the Second World War, the economic situation was difficult with little demand, few spare parts to repair. Toyota pushes the logic of the Jidoka to detect defects as early as possible and not have to repair them. But productivity remains low, 9 times lower than that of American car manufacturers.
1950 - Le tournant
In 1950, Kiichiro resigned to protest against the layoffs imposed by the banks and was replaced by Taiizo Ishida who reorganized the company with the help of Kiichiro's cousin, Eiji Toyoda. Eiji, is on a 12-week study trip to the United States during which he visits many American factories, accompanied by a group of engineers including Taiichi Ōno. Eiji and Taiichi are impressed by the American model but realize that they have to adapt it to the Japanese context, which does not have sufficient demand to benefit from scale effects. They then develop Just in Time, where it is the real demand that defines the production schedule instead of a forecast, and this at each stage of production. Everything starts from the downstream (the customer) and they develop the Kanban system with carts at each station that contain only a minimum number of parts.
1950 - 1962 - The implementation
Nevertheless, the implementation is very gradual, mainly due to the need to make operators multi-skilled and to overcome their reluctance; it was not until 1962, according to Taiichi, that Toyota's plants were deployed in all of them.
These innovations have greatly contributed to Toyota's success and have become known as the « Toyota Production System (TPS) ».
Here is a video showing the history of the TPS
1973 - 1991 Progressive adoption in the West
1973 - Oil shock
Japanese industry is heavily affected by the first oil shock, but Toyota is resisting well and is attracting the interest of the government, which is asking Toyota to hold seminars on the TPS to benefit Japanese industry. A few foreign groups are also beginning to adopt these methodologies, most of the time under their own names. The first official publication on the TPS would date back to 1978, by Taiichi Ohno himself: "Toyota Production System - Aiming at an Off-Scale Management", Tokyo Diamond.
1977 - 1989 Déploiement du Juste à Temps en occident
The first publications in Western countries took place in 1977:
a first article about Toyota's "famous Ohno system" published in American Machinist and written by A. Ashburn
a second article, "Toyota Production System and Kanban System: Materialization of Just-in-time and Respect-for-human System" published in the International Journal of Production Research and written by Y. Sugimori, K. Kusunoki, F. Cho, and S. Uchikawa.
Adoption by Western companies was gradual during the 1980s, as was the number of publications on the subject, mainly by talking about "Just in Time".
1991 Birth of « Lean »
The term "Lean manufacturing" was coined in 1991 and many of its principles were formalized in "The Machine That Changed the World" by James P. Womack, Daniel T. Jones, and Daniel Roos of MIT and in "Lean Thinking" (1996) by the same authors. For example, these works have formalized five principles of Lean:
Define the value
Identify the value flow
Create the flow
Pull the flows
Further developments - Now
Lean became internationally known and recognized during the 1990s and gradually developed, either in the development of concepts or in other fields of application than production.
A criticism of Lean as defined by Womack, Jones and Roos is its overly technical side, the most visible side of Lean, while the human and cultural aspects are less so.
2001 - « The Toyota Way 2001 »
These criticisms and debates led Toyota to (re)formalize its key principles in 2001, articulated around the two pillars of continuous improvement and respect for people in a document called "The Toyota Way 2001".
2004 - « The Toyota Way: 14 Management Principles from the World's Greatest Manufacturer » by Jeffrey Liker
Jeffrey Liker, professor at the University of Michigan, formalized 14 principles of Lean management in his best seller « The Toyota Way: 14 Management Principles from the World's Greatest Manufacturer ».
Other concepts and new fields of application
Other concepts have been added, such as six-sigma, to form "Lean Six-sigma".
Lean, originally designed for production, has developed in several other environments, including:
The "Lean office" or "Lean service", which deploys the principles of Lean in office activities or processing intangible flows (rather than physical products)
"Lean Engineering" or "Lean Development" in Research and Development or Engineering processes
"Lean Software Development" in IT development, which has become more or less integrated with "Agile Development" and "Scrum" methods.
The "Lean Start up" which makes it possible to create a company more quickly and in particular to deliver the right product to customers earlier and on the first try.
What future for Lean?
How will Lean evolve? His death has often been announced, following certain failures, but Lean is still there. Will it be replaced by new concepts such as artificial intelligence, Manufacturing 4.0 digitalization?
History has yet to be written.
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