The Machine That Changed the World

Three researchers from the Massachusetts Institute of Technology (MIT), James P. Womack, Daniel T. Jones, and Daniel Roos, present the findings of a five-year, fourteen-country study called the International Motor Vehicle Program (IMVP), which surveyed over 90 assembly plants in 17 countries. Their central argument is that a production method called lean production, pioneered by the Toyota Motor Company in Japan, is systematically superior to the mass-production system that has dominated global industry since the 1920s, and that its worldwide adoption will transform not only manufacturing but the nature of work and economic competition.

The book opens with the IMVP's origins. Following a 1984 conference on the automobile's future, the authors conclude that North American and European automakers rely on techniques little changed from Henry Ford's era and cannot compete with methods developed by Japanese companies. A senior industry executive proposes a comprehensive international study, which becomes the IMVP at MIT. The program raises $5 million from 36 companies, suppliers, and governments, assembles an international research team with deep industry experience, and gains unprecedented access to factories, design centers, and executive suites around the world.

To frame the significance of lean production, the authors trace the history of three production paradigms. Craft production, exemplified by the Paris firm Panhard et Levassor in the 1890s, relied on highly skilled workers hand-building customized cars one at a time with general-purpose tools. The system accommodated individual customer desires but could not reduce costs through volume, guarantee consistency, or fund systematic innovation. Henry Ford's breakthrough was not the moving assembly line itself but the complete interchangeability of parts, achieved through uniform gauging and advances in machine tools. Between 1908 and 1914, Ford reduced the average assembler's task cycle from over eight hours to just over one minute, replacing skilled fitters with unskilled workers who needed only minutes of training. Alfred Sloan of General Motors then completed the mass-production system by creating decentralized divisions managed through financial reporting, developing a five-model product range from cheap to expensive, and standardizing mechanical components across that range. Together, Ford's factory innovations and Sloan's management and marketing techniques made mass production dominant worldwide by the 1950s, though the system sacrificed product variety and worker fulfillment and treated employees as interchangeable, disposable parts.

The authors then narrate lean production's emergence at Toyota. In 1950, engineer Eiji Toyoda visited Ford's Rouge complex in Detroit and concluded that mass production could not work in Japan, where the domestic market was tiny and demanded wide vehicle variety, the workforce refused to be treated as disposable, capital was scarce, and foreign competitors loomed. Production engineer Taiichi Ohno began reinventing manufacturing from the stamping shop outward. Ohno developed quick die-change techniques that reduced changeover times from a full day to three minutes, discovering that small-batch production actually cost less per part than enormous lots because it eliminated inventory carrying costs and exposed defects almost immediately.

A pivotal crisis in 1949, when collapsing sales and a subsequent strike forced Toyota to terminate a quarter of its workforce and President Kiichiro Toyoda to resign, led to a historic settlement: Remaining employees received lifetime employment guarantees and seniority-based pay tied to company profitability, transforming workers from a variable cost into a long-term fixed asset. Ohno reorganized assembly around teams whose members handled housekeeping, quality checking, and minor repairs in addition to assembly. Any worker could stop the line when a problem emerged, and a method called the five why's traced every error to its root cause. Rework areas virtually disappeared as yields approached 100 percent.

Toyota extended lean principles throughout its operations. It organized suppliers into functional tiers, with first-tier suppliers designing complete component systems to performance specifications and participating from the start of product development. Rather than adversarial bidding, Toyota established a cooperative framework for jointly analyzing costs, determining prices, and sharing profits. A just-in-time delivery system coordinated daily parts flow, reducing inventories to hours rather than weeks. In product development, strong team leaders called shusa managed cross-functional teams that halved engineering effort and cut development time by a third compared with mass producers. In distribution, Toyota built a system in which salespeople visited households directly, compiled detailed databases of customer preferences, and fed information back to development teams, while most cars were built to customer order and delivered within two to three weeks.

The core of the book presents the IMVP's worldwide findings. A comparison between GM's Framingham, Massachusetts, plant and Toyota's Takaoka plant in 1986 reveals Takaoka is nearly twice as productive, three times as accurate, uses 40 percent less space, and maintains two hours of inventory versus Framingham's two weeks. The NUMMI joint venture in Fremont, California, a collaboration between GM and Toyota using an old GM plant and a workforce 80 percent composed of former GM employees, matches Takaoka's quality and nearly matches its productivity, demonstrating that lean production can succeed with a Western workforce. The full global survey shows unexpected variation: Japanese plants range widely in performance, average Big Three plants in North America trail by about 48 percent in effort, and European plants lag even further. The best developing-country plant, Ford's facility in Hermosillo, Mexico, achieves the highest assembly quality in the entire sample. Automation accounts for roughly one-third of productivity differences, but at any automation level the gap between the best and worst plants remains enormous, leading to the authors' axiom that lean organization must precede high-tech automation.

The book's final section examines barriers to lean production's global spread. The authors draw a parallel with mass production's own slow diffusion to Europe, which took decades. The current transition faces analogous obstacles. Ford used its 1982 near-bankruptcy as a creative crisis to implement lean principles after executives and United Auto Workers (UAW) leaders visited Mazda's Hiroshima complex and discovered Mazda could build its 323 model with 60 percent of Ford's effort. GM and Chrysler, lacking comparable crises, improved mainly by closing their worst plants rather than converting any. European companies, protected by trade barriers and a strong market, showed little urgency to change.

The authors identify three principal obstacles to completing the transition. First, Western mass-production corporations are too large for governments to let fail but resistant to reform; they need lean competitors nearby, better industrial finance, and creative crises, accompanied by government-funded retraining for displaced workers. Second, outdated economic thinking assumes low-wage countries can compete through cheap mass production, but Korea's experience proves otherwise: Hyundai's U.S. sales collapsed 50 percent between 1988 and 1990 as quality defects surfaced, demonstrating that lean production's quality threshold cannot be offset by price alone. Third, Japanese lean producers' inward national focus generates growing resistance as Westerners perceive two classes of citizenship in Japanese organizations. The authors urge Japanese companies to become truly post-national enterprises, hiring and promoting employees regardless of nationality and demonstrating transparency.

The book concludes that lean production combines the best features of craft and mass production, reducing costs and improving quality while expanding product variety and making work more challenging. Its diffusion, still at an early stage comparable to mass production in the early 1920s, will determine the fate of companies, industries, and nations. The authors express confidence that lean production will become the global standard of the 21st century but caution that the outcome depends on broad public understanding and prudent action by all parties involved.