Chat with us, powered by LiveChat Give an overview of the driving elements/concepts of lean Select one of the following four topics: Jidoka, Kanban, Heijunka, or Keiretsu. Discuss its expected impact on performance. You | EssayAbode

Give an overview of the driving elements/concepts of lean Select one of the following four topics: Jidoka, Kanban, Heijunka, or Keiretsu. Discuss its expected impact on performance. You

  

Note: The focus of this project is to develop an understanding of lean and explore at least one aspect of it in depth. You will use the Toyota case to provide examples of your insights.

Total length should be between 1500- 2000 words, in APA format

Project Requirements

1. Give an overview of the driving elements/concepts of lean. (This section should be 300-400 words in length.)

2. Select one of the following four topics: Jidoka, Kanban, Heijunka, or Keiretsu. Discuss its expected impact on performance. You must use relevant dimensions from the competitive dimensions model (page 28-32) as well as specific information from the Toyota case to support your claims. (This section will make up the majority of your project.)

Individual Case: (Worth 20% of your final grade)

Note: The focus of this project is to develop an understanding of lean and explore at least one aspect of it in depth. You will use the Toyota case to provide examples of your insights.

Total length should be between 1500- 2000 words, in APA format

Project Requirements

1. Give an overview of the driving elements/concepts of lean. (This section should be 300-400 words in length.)

2. Select one of the following four topics: Jidoka, Kanban, Heijunka, or Keiretsu. Discuss its expected impact on performance. You must use relevant dimensions from the competitive dimensions model (page 28-32) as well as specific information from the Toyota case to support your claims. (This section will make up the majority of your project.)

,

Harvard Business School 9-693-019 Rev. September 5, 1995

Professor Kazuhiro Mishina prepared this case with the assistance of Kazunori Takeda, MBA ’93, as the basis for class discussion rather than to illustrate either effective or ineffective handling of an administrative situation.

Copyright © 1992 by the President and Fellows of Harvard College. To order copies or request permission to reproduce materials, call 1-800-545-7685 or write Harvard Business School Publishing, Boston, MA 02163. No part of this publication may be reproduced, stored in a retrieval system, used in a spreadsheet, or transmitted in any form or by any means—electronic, mechanical, photocopying, recording, or otherwise—without the permission of Harvard Business School.

1

Toyota Motor Manufacturing, U.S.A., Inc.

On the Friday before the running of the 118th Kentucky Derby, Doug Friesen, manager of assembly for Toyota’s Georgetown, Kentucky, Plant, was approaching the final assembly lines, where shiny Camrys took shape. He heard a cheer go up. Team members on the lines were waving their hand tools towards a signboard that read “no overtime for the shift.” Smiling broadly, Friesen agreed: everyone in the plant surely deserved a relaxed Derby weekend.

The plant had been hectic lately, as it was both supplying brisk sales of the all-new Camry sedan and ramping up station wagon versions for the European as well as North American markets. Overtime also had been necessary early in the week to make up lost production because the line utilization rate was below the projected target. In addition to these immediate problems, a growing number of cars were sitting off the line with defective seats or with no seats at all.

The seat problem had been the subject of an urgent meeting called by Mike DaPrile, general manager of the assembly plant, that morning, May 1, 1992. At the meeting, Friesen learned of the situation firsthand from key people in both the plant and the seat supplier. He then spent the afternoon on the shop floor to learn more about the problem while the issues discussed were fresh in his mind. By the end of the day, it became clear to Friesen that the seat problem needed solving once and for all; the trouble was that trying to do so could hurt line utilization. This was not the first tough question Toyota’s famous production system had encountered, nor would it be the last. But this seat problem was especially delicate and undoubtedly would demand Friesen’s attention in the following week.

Background

In the early 1980s, Japanese auto makers contemplated building cars in North America. Japan’s huge trade imbalance had caused political pressure to mount, while the economic feasibility of such investment had improved with a rapidly rising yen. At that time, however, it was unclear whether cars produced outside Japan could live up to their hard-earned reputation of high quality at low cost. This issue was far from settled in 1985 when Toyota Motor Corporation (TMC) unveiled its plan to open an $800 million greenfield plant in Kentucky. (See Exhibit 1.) Thus, the company’s endeavor to transplant its unique production system to Bluegrass Country effectively became a live experiment for the world to watch.

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In July 1988, Toyota Motor Manufacturing, U.S.A. (TMM) began volume production on a 1,300 acre site in Georgetown, near Lexington. The plant had an annual capacity of 200,000 Toyota Camry sedans, which would replace the bulk of Japanese imports of the same model. In 1992, TMM was expected to supply 240,000 of the all-new Camrys, whose sales were up by more than 20% since the model change in fall 1991. The new Camry joined the ranks of midsize family sedans, which constituted one-third of the total American car market and returned an average 17% pretax profit margin1 on a sticker price averaging $18,500. For the first time, in March 1992, TMM started producing wagon versions of the new Camry exclusively within Toyota’s worldwide plant network.

Toyota Production System 2

Since its inception, Toyota had always striven for “better cars for more people.” This meant producing cars meeting diverse customer preferences with flawless quality. It further meant delivering cars at an affordable price with perfect timing. This ambitious goal had seemed nearly elusive after the Second World War, since most people in Japan could not afford a car even at cost. In addition, the country’s labor productivity was only one-eighth of that of the United States. In essence, Toyota was challenged to cut cost dramatically, but without the scale economies that American firms enjoyed. It needed an entirely new source of economies to satisfy customers with variety, quality, and timeliness, all at a reasonable price. The Toyota Production System (TPS) evolved as Toyota’s answer to this challenge, and served as a common frame of reference among all its employees.

TPS aimed at cost reduction by thoroughly eliminating waste, which, in production environments tended to snowball unnoticeably. Waste of overproduction, for example, not only tied up working capital in inventory, but it necessitated warehouse storage space, forklift trucks to move goods about, material handlers to operate trucks, computers to keep track of inventory locations, a staff to maintain the computerized system, and so on. Furthermore, overproduction often concealed the location of the true bottleneck and thereby invited investment in the wrong equipment, resulting in excess capacity.

Identifying what was waste in reality, however, was no simple matter. Thus, TPS provided two guiding principles to facilitate this critical process. The first was the principle of Just-In-Time (JIT) production: produce only what was needed, only how much was needed, and only when it was needed. Any deviation from true production needs was condemned as waste. The second was the principle of jidoka: make any production problems instantly self-evident and stop producing whenever problems were detected. In other words, jidoka insisted on building in quality in the production process and condemned any deviation from value-addition as waste. TPS defined “needs” and “value” from the viewpoint of the next station down the line, that is, the immediate customer.

These TPS principles reflected two assumptions about production environments. First, true needs would deviate from a production plan unpredictably, no matter how meticulously that plan was prepared: hence the virtue of JIT production. Second, problems would crop up constantly on the shop floor, making deviations from planned operating conditions inevitable: hence the virtue of jidoka. TPS, of course, encouraged continually improving the planning process, but it also strongly emphasized alerting plant people to deviations from any plans about how production was to proceed.

To implement the TPS principles, Toyota employed a variety of tools, many described later in this case. For JIT production, these tools were used to keep information flow as close to the physical

1Business Week (May 18, 1992) p. 50.

2The glossary at the end of the case supplements the explanation of Japanese and Toyota production concepts.

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flow of parts as possible. Parts were thus pulled from downstream based on actual usage, rather than pushed from upstream based on a planned schedule remote from the shop floor. This arrangement required upstream stations to be capable of changing over among parts with minimal setup time. Hence, creating a flowing production process was a prerequisite for TPS.

The purposes of jidoka tools were to aid immediate problem detection and facilitate visual control. For them to work properly, the normal state of operations had to be well characterized and understood. Therefore, another prerequisite of TPS was standardizing the process and documenting the standard plainly.

Finally, TPS depended on human infrastructure, symbolized by Toyota’s corporate slogan: “Good Thinking, Good Products.” Plants practicing JIT and jidoka principles were extremely prone to shutdowns, and would be paralyzed without people capable of solving exposed problems promptly, completely, and systematically. Toyota thus instilled “good thinking” in all its employees through senior management coaching and internal training programs. These efforts cultivated two strong attitudes that permeated the organization: stick to the facts, and get down to the root cause of the problem. A typical discussion of a problem would start with “let’s go see it” and then converge on the “Five Whys” exercise. This exercise consisted of asking a chain of “why” questions until the root cause was identified and countermeasures determined (see Exhibit 2).

Methodical thinking extended beyond solving problems after the fact. It enabled people to seek kaizen: change for the better. At Toyota, as soon as anyone established a standard way of doing a job, that person set out to demolish it proactively, to install an even better way. Kaizen was indispensable in pursuing TPS goals continuously and indefinitely.

The Georgetown Ramp Up

Developing human infrastructure was TMC’s foremost priority in transplanting TPS to Georgetown, as evidenced by several decisions made early on. First, TMC assigned to TMM the 1987 Camry that was already being mass-produced in its Tsutsumi plant in Japan. Second, it replicated the Tsutsumi line as closely as possible at TMM. And third, it set a deliberately slow ramp up schedule. As a result, TMC could find people in Tsutsumi who, based on their own experience, were able to demonstrate to TMM how to solve the problems encountered in that plant.

While construction was underway at Georgetown in early 1986, TMM initiated a hiring and training program (run out of a trailer office). It began with top managers and proceeded to core operations personnel; these people primarily came from within the industry and formed the nucleus of TMM operations. Their first encounter with TPS occurred during a month-long trip to Tsutsumi, to which Doug Friesen’s reaction was quite typical:

I built cars at Tsutsumi, and couldn’t believe 60% of what I saw there. The line was unbelievably fast-paced, the plant was kind of run down, and the American company I left had more automation. The good things I saw were just common sense and no big deal at all. My eyes weren’t open back then.

Next, TMC sent Tsutsumi people to Georgetown, hundreds of them in all. These trainers-on- loan coached TMM supervisory personnel one-on-one and reinforced TPS basics. Every TMM manager was also paired with a coordinator from TMC, who remained in Kentucky for a few years. These coordinators were charged to develop their counterparts only by persuasionCnot to do things themselves. This intensely personal approach brought an “eye-opening” moment to most TMM people. As TMC’s plan unfolded in front of them, they could witness actions in the context around them, appreciate unexpectedly positive results, and have their coaches make sense of what lay behind these results. Although everyone had a unique episode that marked a turning point, they converged

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on one point: “TPS isolates problems from people and thereby enables people to focus on solving problems.”

Fujio Cho, president of TMM and TPS evangelist, described his vision:

We fortunately have not seen any surprises so far. I believe in the universality of TPS and its ability to deliver high quality. To develop TMM, we put safety above all else and began with quality. We then added productivity to our target. Right now, our cars are as good as Tsutsumi’s in quality and we are only slightly behind in productivity. We are currently moving to the next stepCworrying about cost and spreading TPS to local suppliers. I am hopeful that we can make TMM a truly American company that contributes to the community.

In early 1992, Georgetown’s huge complex employed over 4,000 people, representing $150 million in annual payroll. In the plant’s backyard, construction was underway to double TMM’s capacity.

Operations

In Georgetown, the power train plant supplied engines and axles to the assembly plant, which performed sheet-metal stamping, plastic molding, body welding, painting, and assembly operations. In these direct operations as well as in their support functions (see Exhibit 3), TPS was deployed as a set of management tools to be practiced daily. Mike DaPrile commented:

TPS highlights problems so that people can see them easily. The hard part is teaching it so that people practice it because they want to, rather than because they have to. To teach it well, you have to get to know people very deeply and over time. In the process, we all become students here. In fact, I have learned more in the last five years than I did in the 25 years I spent with another auto company.

Assembly

Assembly operations were performed along 353 stations on a conveyor line, over five miles in length and consisting of several connected line segments: the trim lines, chassis lines, and final assembly lines. Adjacent line segments were decoupled by a few cars, and the entire assembly line was buffered from the power train plant and the paint line with about half an hour’s production. The line currently operated on a line cycle time of 57 seconds, down from 60 at the startup.

Assembly and part handling required 769 team members, who were paid an average of $17 an hour (not including benefits), plus a 50% premium for overtime. A team usually had four members and one team leader, who received a premium of 5% to 8%. To supervise these team leaders and team members in two shifts, Doug Friesen worked closely with 10 assistant managers and 46 group leaders (see Exhibit 3). A regular shift lasted 525 minutes, including 45 minutes of unpaid lunch time and two paid 15-minute breaks. When a team member had to leave the moving line, the team leader filled in that position as a line rover.

Every station on the assembly line embodied jidoka and kaizen tools. A standardized work chart was posted adjacent to each work station on the line, showing the cycle time of that station, the sequence of work tasks, and the timing to perform them within one cycle. Colored tape marked out areas of the floor to specify where just about everything in sight belonged, and promoted the “4Ss (sift, sort, sweep, spic-and-span).” In the resulting work environment, any deviations from normal conditions stood out visually.

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A green line and a red line drawn at right angles to the assembly line marked the beginning and the end of each work station. A team member would start the work for one cycle when a car reached the green line and finish all tasks by the red line. A yellow line in between marked a point by which 70% of the work had to be completed. If the team member was behind at this yellow line or found any other problem, he or she pulled the andon cord: a rope running along the assembly line over the work area. An andon pull turned on a flashing light, triggered loud music, and lit up the work station’s “address number” on the andon board (see Exhibit 4). The team leader then rushed to that work station to ask what the problem was and, if it was correctable, turned off the lights and music by pulling the andon cord again. If, however, the team leader could not resolve the problem immediately, he or she left the andon on and allowed the line segment to stop at the red line, that is, when the other work stations completed their cycles. This stoppage instantly attracted the group leader’s attention. A team member, on average, pulled the andon cord nearly one dozen times per shift, and typically, one of these andon pulls resulted in an actual line stoppage. Doug Friesen explained:

In our system, every team member is focused on building quality in through andon pulls. We then call on team leaders to respond quickly, and group leaders to take countermeasures to prevent the recurrence of the problem. Our job as managers is to keep the line going, and that means developing people. It’s easy to say “do this and do that,” but nothing happens unless we follow through because people fall back into old habits. Leadership means standing by people for hours to help them acquire the new way. It takes patience.

Production Control

The mission of the production control (PC) department was to feed necessary parts into TMM operations so that the right number of cars in the right mix could be delivered to the sales company just-in-time. PC’s task thus involved coordination with TMC, the sales company, and local suppliers. Although TMM made only Camrys whose destinations were limited to North America and Europe, in May of 1992 there were 23 sedan and wagon models, 11 exterior colors, 29 interior variations, and 30 other options like a moonroof. Thus, the number of combinations actually produced reached several thousand.

To meet the challenge of such variety, PC relied on the extensive forecasting and planning that TMC performed for worldwide markets. To prepare for May production, for example, PC first received, in January, a Production Planning Order (PPO) for key specifications from the sales company. This PPO was revised in February and, after one more update, was fixed as a Total Vehicle Order (TVO) by the end of March. While total volume was fixed in late March, the PPO was generally accurate only within �20% of the TVO for most specification categories at that point. Next, the TVO was broken down weekly: by the end of the second week of April it was done for the first week of May. During the third week of April, the initial May week’s information was translated into final part orders for local suppliers as well as a daily production sequence for TMM operations. This procedure left one full week for production preparation.

The planning process reflected JIT principles in two major ways. First, the practice of heijunka called for evening out (balancing) the total order in the daily production sequence. Suppose, for example, a monthly order for 20 working days comprised 20,000 sedans, equally divided between a base model and a luxury model. In conventional auto manufacturing operations, the order would be broken into several production runs, each dedicated to just one model. Daily volume would vary with line changeovers between runs, and a learning effect would occur within one batched run. The heijunka practice, however, would call for 500 base models and 500 luxury models every single day and also demand that a base model and a luxury model be made alternately. Likewise, if 25% of the order specified a moonroof option, one out of every four consecutive cars on the assembly line had to

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contain that option. Thus, TMM’s assembly line exhibited a variety of shapes and colors, with every car displaying a printout (manifest) that informed team members of the vehicle’s full specifications.

The heijunka practice achieved two purposes. Spreading out the demand for parts as evenly as possible relieved suppliers of a surge of workload and facilitated their JIT production. Without heijunka, a moonroof supplier, for instance, would either become busy just one week every month or engage in level production and live with the risk of order cancellation and inventory obsolescence. With heijunka, the same supplier could stick to a uniform cycle time throughout the month (say, one moonroof every 4 x 57 = 228 seconds) without creating the waste of inventory. Similarly, offsetting cars that required a particular operation against those that did not prevented any particular work station from becoming a severe bottleneck or remaining unreasonably idle. Heijunka also synchronized the assembly line with the ultimate sales of the cars.

The second JIT principle was reflected in the use of kanban cards. Although all production plans were shared with suppliers to ease their planning, only kanbans triggered part production. A kanban card included a part code number, its batch size, its delivery “address,” and other related information. Every part container sitting on the flow rack along the assembly line held one batch and had its own card. The card would physically travel between this part-use point and the supplier, whether in-house or outside, to signal the actual parts needed. When (and only when) the supplier received a kanban, it began making that part in the stated quantity, and shipped a container full of that part to the proper “address” on the assembly line. Assembly group leaders adjusted the number of circulating kanbans for each part within a set range, determined by the PC department, to avoid having teams run out of parts or containers overflowing onto the plant floor. The PC department monitored the circulation of kanbans closely both to determine the appropriate kanban range and to feed information back to parts ordering for even better inventory control.

Quality Control

TMM’s quality control (QC) department pursued a mandatory routine of setting tough quality standards, inspecting every vehicle against those, and following through on the customer’s experience with shipped vehicles. In addition, QC engineers were called on by assembly group leaders to help them solve assembly quality problems and work out part quality problems with suppliers. Twenty patrol inspectors on each shift also observed problematic items that they had been notified about among the thousands of different parts arriving at the receiving dock.

QC served two other functions as well. The first was providing instant feedback to direct operations including final assembly. On the last stretch of the final assembly line, QC checked assembly quality before cars went off to elaborate shipping inspection, and it “returned” problematic cars immediately to an assembly group. This group then diagnosed the causes of the problems with QC and, while repairing the cars in the clinic area, fed the information back to the appropriate teams. When eight cars filled up this limited clinic space, the assembly line was shut down under a “Code 1” status and Friesen and his assistant managers gathered to discuss countermeasures. This procedure worked as an equivalent of andon pulls for the managers. Mike DaPrile, being used to a much larger repair yard in his previous job, had protested before the ramp up that this clinic area was “way too small”Conly to find out that TMC really wanted him to stop production as soon as four cars occupied the area.

QC’s second unique function was proactive: preventing problems from occurring in the first place. As Rodger Lewis, assistant general manager of QC, explained:

We’ve got to go back to the source of the problems because our target moves every year. In the J. D. Power Initial Quality Survey, our Camry was third, with .72 defects per vehicle in 1990, and eighth, with .79 in 1991. The top runner went down from .63 to .47, but it’s O.K. We are trying to build in quality before cars come to the factory. Oh, it’s a joy to work with design people! They want to know any problems

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we have with their design and consider our inputs a blessing. It’s really nice that we don’t have to fight. We are also trying to get suppliers to go beyond our engineering drawings to preempt problems. We set one goal at a time for the suppliers, though, because that’s the way to build trust.

Purchasing

Because TMM’s PC and QC departments engaged in fire fighting to solve delivery and quality problems directly with part suppliers, upon requests from assembly, the purchasing department was freed up to concentrate on managing costs over the long haul. Kevin Smith, manager of purchasing, elaborated:

For four years prior to joining TMM, I was a buyer for another auto company. My job there was basically to get the lowest price by pitting suppliers against one another. My new boss from TMC introduced me to a totally different world. He couldn’t care less about low price because he knew suppliers always came back to jack up their initial quote. He only wanted low cost suppliers. Without low cost, it’s logically impossible for any supplier to offer low price consistently. Now, how do you estimate a supplier’s manufacturing cost without their cost data? I didn’t know how to do this when I first arrived at TMM. But I’ve learned how to estimate cost, and our company has had good success in encouraging suppliers to share their cost data with us. With costs on the table, I can discuss with suppliers how they can improve their manufacturing process and how we can help them with our kaizen experts. Doing this is a big part of my job now.

The Seat

A Camry seat consisted of several pieces: the front left and right assemblies, the rear seat bench and backrests, and the rear side bolsters.3 Because of its features, the seat posed several challenges. To final assembly, it was a soft part prone to damage and by far the bulkiest of all the installed parts. To QC, on the one hand, it was a safety item because it had to meet rigorous standards for the car’s crash performance. On the other hand, the seat was a sensory item because the feel of its surface finish had to satisfy customers, yet there were no precise standards in this area. To purchasing, the seat set was the most expensive of all the purchased partsCcosting $740, with fabric accounting for almost half that figure.

Manufacturing and Installation

TMM’s sole seat supplier was Kentucky Framed Seat (KFS),4 with whom it operated on a system of sequential pull. With this system, something truly magical happened. Every 57 seconds, as a Camry passed through one of the final assembly work stations, a seat set exactly matching its model type and interior color popped up by the side of the line. When a blue DX sedan arrived, so did a seat set with blue fabric covering. For the next black XLE sedan, here came a power seat set with gray leather coveringCall just-in-time.

3These bolsters provided lateral support for rear seat passengers and concealed the gap between the back rests and the car body.

4The supplier's name has been disguised.

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This magic was achieved as follows: As body shells emerged from the paint line, one after another, a small transmitter attached to each body sent manifest information to printers at both TMM and KFS. These printouts thus continuously appeared in real time, in the exact sequence in which cars entered the trim line (the first of the assembly line segments), and finalized the entire assembly sequence for KFS’ operations as well as for TMM. The production plan was ignored, for although the body shells entered the paint line according to plan, the sequence was altered because some cars needed to repeat certain loops of the paint process.

KFS’ manifest specified the style and color of the seat, and triggered seat production much like a kanban of lot size one. As cars traveled down TMM’s fi

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