last week, during a study mission in japan, the lean global network visited toyota. here, jim shares his thoughts on what we saw and learned.
上周，精益全球网络在日本组织了一次考察活动，期间访问了丰田汽车公司。对于我们在这次考察活动中的所见所学，dr. james womack在下文分享了他的想法。
this year marks the 10th anniversary of the lean global network and so it seemed appropriate to hold the annual meeting of the 23 national affiliate organizations at toyota in japan this past week. i write this far above the pacific as i return.
the timing of this trip was perfect for me, because i have been reflecting on the lean movement and our mission as we also celebrate lei’s 20th anniversary. as readers discovered last month, i’m concerned about the progress we are making in spreading lean thinking and practice. we’ve got great ideas but we are still struggling to get the world’s managers to adopt them.
given my qualms, it would have been truly dismaying to discover that toyota and its supplier group have lost their way at the lean point of origin in japan. so, i approached our visit with some concern.
i knew that toyota had conducted deep critical self-reflection (what we refer to as hansei) after it grew too fast in the 2000s in pursuit of leadership in global market share. and i knew that president akio toyoda had summarized his conclusions in two simple phrases: “back to basics” and “design interesting vehicles”. the former meant returning to traditional toyota management practices that put customers (rather than rapid growth and market share) first, while the latter meant acknowledging that the global auto industry has leveled up on quality and durability – the company’s prime differentiators in the market for decades – and that toyota designs that avoid risk but fail to stoke passion would no longer serve. but until the lgn study tour, i had no first-hand, gemba knowledge of what had been accomplished.
what i found in a week of walking through truly lean facilities in toyota city and talking with engineers and managers, young and old, were striking examples of putting these simple directions into practice.
toyota has refreshed the chief engineer system for a new competitive environment where customers want a wide variety of products, but car companies need to control development expenses so that resources will be available for massive investments in new technologies – notably alternative energy and autonomy – and for experiments with mobility offerings beyond simply selling customers vehicles. (for example, in may 2016 toyota made a large investment in uber.)
the chief engineer (ce) concept had been revised before, in the early 1990s, as toyota grew rapidly. to manage the growing variety of small and large cars and light trucks, toyota created platform groups for these vehicles above the traditional ces. but this was not enough as the company surged to 10 million vehicles by 2009 and fell behind in the performance of its basic platforms. as a result, ces were substantially reengineering the base platforms to serve their customers and driving up development costs.
the new approach is to keep ces in charge of products but to set boundaries on the number of components and systems, while reengineering each of a smaller number of platforms to a higher standard. for example, the center of gravity of toyota vehicles has been lowered for better driver experience, the number of transmissions has been halved, and the use of standard fit points has reduced the number of alternators from 14 to 6. ces can appeal to a high-level committee if none of the standard options suits their customers, but the quality of the smaller number of new platforms permits new products like the camry to be dramatically improved without spending massive amounts on customization of the underbody.
recent styling decisions by chief engineers in quest of akio’s request for “interesting vehicles” can be debated (although i’m beginning to like my new prius prime advanced, which i originally approached with my eyes closed). but the ces are at least trying experiments going beyond toyota’s traditional comfort zone as the whole global industry struggles with how autonomous, electric, shared-use vehicles should look and drive.
toyota has launched its toyota new global architecture (tnga) to design future products with common fit points that will permit many products to go down any production line and to share major components. this is important in a world where neither the mix of vehicle options nor the volume for whole products can be forecast and products need to be shifted between plants.
丰田近年推出新全球架构（toyota new global architecture, tnga），使用统一的定位点来设计未来产品，让不同款式的汽车能在同一条生产线上生产，并尽可能共享主要部件。面对一个既无法预测车型组合、又很难预测产品数量，且为了满足市场还需要在工厂之间转移生产等各种挑战，柔性生产设计是个不容忽视的课题。
for example, at the tsutsumi plant in toyota city we saw four different vehicles and variants within these vehicles (e.g., the regular prius and prius prime with a much larger battery) being assembled on the same lines in mixed sequence. this requires that many parts be kitted off line and delivered to the line in assembly sequence (as seats have always been.)
stated another way, toyota has decided that its past practice of assigning low-volume and high-variety products to its contract assemblers (such as kanto and toyota auto body) and its high-volume products like camry and rav 4 to its big assembly plants like takaoka, motomachi and tsutsumi, must now change so that all plants can handle lower volume products with a higher option mix in mixed assembly sequence. this sounds simple but requires standard fit points – for example for the carriers taking vehicles through assembly – and massive changes in assembly plant practices if costs are to be reduced.
toyota is conducting a range of experiments on the right mix of humans and robots. at a tokai rika plant making interior components we saw a well-designed work cell producing a previous generation of a product, an adjacent cell producing a new version of this product with intense attention to design for manufacture that removed much of the labor content, and a third cell nearby making the same new design with robotic assembly “labor”. (note that these experiments were under way on the factory floor and were making production parts.) despite the world’s enthusiasm for technology 4.0, with machines supposedly ready to eliminate much of the workforce, the robots at tokai rika did not seem to be winning. (this is consistent with executive vice president and global production chief mitsuru kawai’s belief that brilliant redesign of work to eliminate more muda is a better approach than spending enormous sums on automation.)
toyota has proved that it still has the basic skills to recover when it makes operational mistakes. at toyota industrial corporation, a maker of forklifts, tractor, and other material handling equipment that is part of the original toyota automatic loom company, 37-year toyota veteran sadeo nomura was called in as senior advisor to create basic stability after management took its eye off the ball during dramatic growth (unusually for toyota, by acquisition) in the 2000s. by reinforcing visual management in every work place and quickly counter-measuring every deviation from standards, in-process defects were reduced by 98 percent across the production system of ten plants in seven countries and warranty claims were reduced by two thirds. in addition, the high-mix mother plant in toyota city is one of the finest examples of lean production i have seen.
toyota is pursuing system kaizen in its service parts distribution to dealers in japan and abroad, which is already the most efficient and effective in the world. where else can one find a warehouse stocking 300,000 part numbers that turns its inventory every week? and yet the senior tps advisor assigned to the system sees the potential for dramatic improvement of the entire service parts network in the next few years.
toyota is pursuing a portfolio of choices for motive power – enhanced hybrids, hydrogen fuel cells, and electrics with solid state batteries – in a time of technological discontinuity. this is clearly an example of concurrent engineering in which toyota continues to pursue a range of radically different possibilities until the best approach emerges even as competitors double down on a single technology. (concurrent engineering in a lean product and process development environment is traditionally about small things, whereas toyota is now applying these principles to big, complex technologies.)
toyota has maintained a remarkable continuity in leadership under one family through five generations (despite the toyoda family owning only 1% of the shares) and we met a deep bench of young managers in every facility with a remarkable depth of lean skills.
so, i’m relaxing up here in the sky. toyota is doing fine, having gotten back to basics. now it’s time for the rest of us to get back to the work of thinking through our strategy for the next phase of the lean movement.