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Just-in-time manufacturing

From Wikipedia, the free encyclopedia

Just-in-time (JIT) manufacturing, also known as just-in-time production or the Toyota Production System (TPS), is an inventory control methodology aimed primarily at reducing times within production system as well as response times from suppliers and to customers. Its origin and development was in Japan, largely in the 1960s and 1970s and particularly at Toyota.[1][page needed][disputed ], [2][page needed][disputed ]

Alternative terms for JIT manufacturing have been used. Motorola's choice was short-cycle manufacturing (SCM).[3][4] IBM's was continuous-flow manufacturing (CFM),[5][6] and demand-flow manufacturing (DFM), a term handed down from consultant John Constanza at his Institute of Technology in Colorado.[7] Still another alternative was mentioned by Goddard, who said that "Toyota Production System is often mistakenly referred to as the 'Kanban System'", and pointed out that kanban is but one element of TPS, as well as JIT production.[8]:11

But the wide use of the term JIT manufacturing throughout the 1980s faded fast in the 1990s, as the new term lean manufacturing became established[9][page needed], [10][need quotation to verify] as "a more recent name for JIT".[11] As just one testament to the commonality of the two terms, Toyota production system (TPS) has been and is widely used as a synonym for both JIT and lean manufacturing.[12][citation needed], [13]

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  • ✪ Just in Time by Toyota: The Smartest Production System in The World
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Transcription

I’m Alex Berman and you’re watching SELLING BREAKDOWNS. Whenever you buy a complex piece of equipment such as a TV or a car, do you ever wonder; how exactly it all came together? Well, ever since the industrial revolution, that “how” has been a vital question for many businesses. Today, we’re going to look at how in post-war Japan, Toyota helped to create one of the smartest production systems that we have, named “Just In Time”. We’ll look at how it works and how you can apply the philosophy and practises to many other areas of business. After World War 2, Japan faced some difficult problems; they didn’t have a lot of cash, resources were scarce, and there wasn’t a lot of free land to expand factories. However, Taiichi Ohno at Toyota managed to turn these problems into advantages by slowly creating the Just In Time system. The idea didn’t all come at once, it’s more that through the 50s and 60s, various changes were implemented and improved until the 70s were the wider world began to realise the benefits and adopted a similar approach. So, what is Just In Time? The philosophy is to make the entire production system only work with what it needs and to minimise wait times between each stage. The big saving is normally around inventory. Before Just In Time, a company would keep a warehouse filled with the parts and raw materials it needed. When supplies were getting low, they would reorder when they had just enough to keep going until the new delivery came. But Toyota realised; what if you just keep making that same order, as soon as the next one arrives? That way, you never need to keep this stockpile of spare parts. The cost savings were huge since warehousing is seriously expensive; you need to pay for a massive space, power, staff, security, and for parts that are just sitting there, waiting, not making you money or adding value to your product. And this is the core of Just In Time; you look at each area of production and ask “is this adding value to the product?” If it isn’t, maybe there’s a better way to do it. You cut everything down to it’s most efficient form, with almost no room for error, which is where the risk in Just In Time lies. Toyota used Japan’s relatively small size to its advantage. You could rely on suppliers delivering exactly on time because they only had to travel small distances. If you get problems with supply then it can shut down the whole system. But it’s normally worth the risk; the savings are huge, on inventory and staff costs. More than this though, you are forced to create a working philosophy that there is no room for error; you don’t have spare parts or spare time so you have to make sure everything functions perfectly. Often efficiency comes at the cost of quality, but not in this case. In Just In Time; you are forced into quality in order to be efficient. That’s why it’s applicable to many other areas of business. The best way to think about it is if we simplify everything to two approaches; Just In Time and Just In Case. With Just In Case, you are trying to minimise risk by always giving yourself a buffer. You’ll carry extra stock so you can swap out faulty items. You’ll over-staff certain areas because they’ve occasionally had too much work to deal with. You’ll support a service that just a few customers ask for. With Just In Time, you don’t simply cut these areas and cross your fingers that nothing bad happens. No, you work out how you can avoid them happening in the first place. Because this is money that is wasted unless a bad thing happens, you’re effectively investing in mistakes. Better quality control means staff can trust the stock they have so they don’t need a back up. As for workloads, the only reason one department is hit by a workload they can’t handle is because there is not enough visibility between departments. If your sales team know the capacity of production and its current status, then they won’t put in an order that can’t be filled. And as for offering a service with limited customer appeal, well, maybe you cut it out completely or just find a way to merge it with other services so the resources it requires are absolutely minimal. When done well, the Just In Time philosophy should be good for moral too because the whole point of it is telling your staff “I’m trusting you to perform consistently” and I think most of us respond well to that kind of respect. Wanna learn more about business theory and history? Be sure to like and subscribe to be notified of our next segment.

Contents

History

Evolution in Japan

The exact reasons for adoption of JIT in Japan are unclear. Plenert offers four reasons, paraphrased here. During Japan's post-World War II rebuilding of industry: 1) Japan's lack of cash made it difficult for industry to finance the big-batch, large inventory production methods common elsewhere. 2) Japan lacked space to build big factories loaded with inventory. 3) The Japanese islands were (and are) lacking in natural resources with which to build products. 4) Japan had high unemployment, which meant that labor efficiency methods were not an obvious pathway to industrial success. Thus the Japanese "leaned out" their processes. "They built smaller factories ... in which the only materials housed in the factory were those on which work was currently being done. In this way, inventory levels were kept low, investment in in-process inventories was at a minimum, and the investment in purchased natural resources was quickly turned around so that additional materials were purchased." Plenart goes on to explain Toyota's key role in developing this lean or JIT production methodology.[14]

Migration to the West

News about JIT/TPS reached western shores in 1977 in two English-language articles: one referred to the methodology as the "Ohno system", after Taiichi Ohno, who was instrumental in its development within Toyota.[15] The other article, by Toyota authors in an international journal, provided additional details.[16] Finally, those and other publicity were translated into implementations, beginning in 1980 and then quickly multiplying throughout industry in the United States and other developed countries. A seminal 1980 event was a conference in Detroit at Ford World Headquarters co-sponsored by the Repetitive Manufacturing Group (RMG), which had been founded 1979 within the American Production and Inventory Control Society (APICS) to seek advances in manufacturing. The principle speaker, Fujio Cho (later, president of Toyota Motor Corp.), in explaining the Toyota system, stirred up the audience, and led to the RMG's shifting gears from things like automation to JIT/TPS.[17]

At least some of audience's stirring had to do with a perceived clash between the new JIT regime and manufacturing resource planning (MRP II), a computer software-based system of manufacturing planning and control which had become prominent in industry in the 1960s and 1970s. Debates in professional meetings on JIT vs. MRP II were followed by published articles, one of them titled, "The Rise and Fall of Just-in-Time".[18] Less confrontational was Walt Goddard's, "Kanban Versus MRP II—Which Is Best for You?" in 1982.[19] Four years later, Goddard had answered his own question with a book advocating JIT.[8] Among the best known of MRP II's advocates was George Plossl, who authored two articles questioning JIT's kanban planning method[20] and the "japanning of America".[21] But, as with Goddard, Plossl later wrote that "JIT is a concept whose time has come".[22]

JIT/TPS implementations may be found in many case-study articles from the 1980s and beyond. An article in a 1984 issue of Inc. magazine[23] relates how Omark Industries (chain saws, ammunition, log loaders, etc.) emerged as an extensive JIT implementer under its US home-grown name ZIPS (zero inventory production system). At Omark's mother plant in Portland, Oregon, after the work force had received 40 hours of ZIPS training, they were "turned loose" and things began to happen. A first step was to "arbitrarily eliminate a week's lead time [after which] things ran smoother. 'People asked that we try taking another week's worth out.' After that, ZIPS spread throughout the plant's operations 'like an amoeba.'" The article also notes that Omark's 20 other plants were similarly engaged in ZIPS, beginning with pilot projects. For example, at one of Omark's smaller plants making drill bits in Mesabi, Minnesota, "large-size drill inventory was cut by 92%, productivity increased by 30%, scrap and rework ... dropped 20%, and lead time ... from order to finished product was slashed from three weeks to three days." The Inc. article states that companies using JIT the most extensively include "the Big Four, Hewlett-Packard, Motorola, Westinghouse Electric, General Electric, Deere, and Black and Decker".

By 1986, a case-study book on JIT in the U.S.[24] was able to devote a full chapter to ZIPS at Omark, along with two chapters on JIT at several Hewlett-Packard plants, and single chapters for Harley-Davidson, John Deere, IBM-Raleigh, North Carolina, and California-based Apple Computers, a Toyota truck-bed plant, and New United Motor Manufacturing joint venture between Toyota and General Motors.

Two similarly-inclined books emergent in the U.K. in the same years are more international in scope.[25] One of the books, with both conceptual articles and case studies, includes three sections on JIT practices: in Japan (e.g., at Toyota, Mazda, and Tokagawa Electric); in Europe (jmg Bostrom, Lucas Electric, Cummins Engine, IBM, 3M, Datasolve Ltd., Renault, Massey-Ferguson); and in the USA and Australia (Repco Manufacturing-Australia, Xerox Computer, and two on Hewlett-Packard). The second book, reporting on what was billed as the First International Conference on just-in-time manufacturing,[26] includes case studies in three companies: Repco-Australia, IBM-UK, and 3M-UK. In addition, a day-2 keynote discussed JIT as applied "across all disciplines, ... from accounting and systems to design and production".[26]:J1–J9

Middle era and to the present

Three more books which include JIT implementations were published in 1993,[27] 1995,[28] and 1996,[29] which are start-up years of the lean manufacturing/lean management movement that was launched in 1990 with publication of the book, The Machine That Changed the World.[30] That one, along with other books, articles, and case studies on lean, were supplanting JIT terminology in the 1990s and beyond. The same period, saw the rise of books and articles with similar concepts and methodologies but with alternative names, including cycle time management,[31] time-based competition,[32] quick-response manufacturing,[33] flow,[34] and pull-based production systems.[35]

There is more to JIT than its usual manufacturing-centered explication. Inasmuch as manufacturing ends with order-fulfillment to distributors, retailers, and end users, and also includes remanufacturing, repair, and warranty claims, JIT's concepts and methods have application downstream from manufacturing itself. A 1993 book on "world-class distribution logistics" discusses kanban links from factories onward.[36] And a manufacturer-to-retailer model developed in the U.S. in the 1980s, referred to as quick response,[37] has morphed over time to what is called fast fashion.[38][39]

Methodology

Sepheri provides a list of methodologies of JIT manufacturing that "are important but not exhaustive":[40]

  • Housekeeping – physical organization and discipline.
  • Make it right the first time – elimination of defects.
  • Setup reduction – flexible changeover approaches.
  • Lot sizes of one – the ultimate lot size and flexibility.
  • Uniform plant load – leveling as a control mechanism.
  • Balanced flow – organizing flow scheduling throughput.
  • Skill diversification – multi-functional workers.
  • Control by visibility – communication media for activity.
  • Preventive maintenance – flawless running, no defects.
  • Fitness for use – producibility, design for process.
  • Compact plant layout – product-oriented design.
  • Streamlining movements – smoothing materials handling.
  • Supplier networks – extensions of the factory.
  • Worker involvement – small group improvement activities.
  • Cellular manufacturing – production methods for flow.
  • Pull system – signal [kanban] replenishment/resupply systems.

Objectives and benefits

Objectives and benefits of JIT manufacturing may be stated in two primary ways: first, in specific and quantitative terms, via published case studies; second, general listings and discussion.

A case-study summary from Daman Products in 1999 lists the following benefits: reduced cycle times 97%, setup times 50%, lead times from 4 to 8 weeks to 5 to 10 days, flow distance 90% – achieved via four focused (cellular) factories, pull scheduling, kanban, visual management, and employee empowerment.[41]

Another study from NCR (Dundee Scotland) in 1998, a producer of make-to-order automated teller machines, includes some of the same benefits while also focusing on JIT purchasing: In switching to JIT over a weekend in 1998, eliminated buffer inventories, reducing inventory from 47 days to 5 days, flow time from 15 days to 2 days, with 60% of purchased parts arriving JIT and 77% going dock to line, and suppliers reduced from 480 to 165.[42]

Hewlett-Packard, one of western industry's earliest JIT implementers, provides a set of four case studies from four H-P divisions during the mid-1980s.[43] The four divisions, Greeley, Fort Collins, Computer Systems, and Vancouver, employed some but not all of the same measures. At the time about half of H-P's 52 divisions had adopted JIT.

Greeley Fort Collins Computer Systems Vancouver
Inventory reduction 2.8 months 75% 75%
Labor cost reduction 30% 15% 50%
Space reduction 50% 30% 33% 40%
WIP stock reduction 22 days to 1 day
Production increase 100%
Quality improvement 30% scrap, 79% rework 80% scrap 30% scrap & rework
Throughput time reduction 50% 17 days to 30 hours
Standard hours reduction 50%
No. of shipments increase 20%

Potential risks

According to Williams, it becomes necessary to find suppliers that are close by or can supply materials quickly with limited advance notice. When ordering small quantities of materials, suppliers’ minimum order policies may pose a problem, though.[44]

Employees are at risk of precarious work when employed by factories that utilize just-in-time and flexible production techniques. A longitudinal study of US workers since 1970 indicates employers seeking to easily adjust their workforce in response to supply and demand conditions respond by creating more nonstandard work arrangements, such as contracting and temporary work.[45]

Natural and man-made disasters will disrupt the flow of energy, goods and services. The down-stream customers of those goods and services will, in turn, not be able to produce their product or render their service because they were counting on incoming deliveries "just in time" and so have little or no inventory to work with. The disruption to the economic system will cascade to some degree depending on the nature and severity of the original disaster. [46] [47] The larger the disaster the worse the effect on just-in-time failures. Electrical power is the ultimate example of just-in-time delivery. A severe geomagnetic storm could disrupt electrical power delivery for hours to years, locally or even globally. Lack of supplies on hand to repair the electrical system would have catastrophic effects. [48]

See also

Further reading

  • Billesbach, Thomas J. 1987. Applicability of Just-in-Time Techniques in the Administrative Area. Doctoral dissertation, University of Nebraska. Ann Arbor, Mich., University Microfilms International.
  • Goddard, W.E. 2001. JIT/TQC—identifying and solving problems. Proceedings of the 20th Electrical Electronics Insulation Conference, Boston, October 7–10, 88–91.
  • Goldratt, Eliyahu M. and Fox, Robert E. (1986), The Race, North River Press, ISBN 0-88427-062-9
  • Hall, Robert W. 1983. Zero Inventories. Homewood, Ill.: Dow Jones-Irwin.
  • Hall, Robert W. 1987. Attaining Manufacturing Excellence: Just-in-Time, Total Quality, Total People Involvement. Homewood, Ill.: Dow Jones-Irwin.
  • Hay, Edward J. 1988. The Just-in-Time Breakthrough: Implementing the New Manufacturing Basics. New York: Wiley.
  • Hohner, Gregory (1988). "JIT/TQC: integrating product design with shop floor effectiveness". Industrial Engineering. 20 (9): 42–48.
  • Hum, Sin-Hoon (1991). "Industrial progress and the strategic significance of JIT and TQC for developing countries". International Journal of Operations & Production Management. 110 (5): 39–46.
  • Hyer, Nancy; Wemmerlov, Urban (2001). Reorganizing the Factory: Competing Through Cellular Manufacturing. CRC Press. ISBN 9781563272288.
  • Jackson, Paul (1991). "White collar JIT at Security Pacific". Target. 7 (1): 32–37.
  • Lubben, R.T. 1988. Just-in-Time Manufacturing: An Aggressive Manufacturing Strategy. New York: McGraw-Hill.
  • Monden, Yasuhiro. 1982. Toyota Production System. Norcross, Ga: Institute of Industrial Engineers.
  • Ohno, Taiichi (1988), Toyota Production System: Beyond Large-Scale Production, Productivity Press, ISBN 0-915299-14-3
  • Ohno, Taiichi (1988), Just-In-Time for Today and Tomorrow, Productivity Press, ISBN 0-915299-20-8.
  • Schonberger, Richard J. 1982. Japanese Manufacturing Techniques: Nine Hidden Lessons in Simplicity. New York: Free Press.
  • Shingo, Shingeo; Dillon, Andrew P. (1989). A Study of the Toyota Production System: From an Industrial Engineering Viewpoint. ISBN 9780915299171.
  • Suri, R. 1986. Getting from 'just in case' to 'just in time': insights from a simple model. 6 (3) 295–304.
  • Suzaki, Kyoshi. 1993. The New Shop Floor Management: Empowering People for Continuous Improvement. New York: Free Press.
  • Voss, Chris, and David Clutterbuck. 1989. Just-in-Time: A Global Status Report. UK: IFS Publications.
  • Wadell, William, and Bodek, Norman (2005), The Rebirth of American Industry, PCS Press, ISBN 0-9712436-3-8

References

  1. ^ Ohno, Taiichi (1988). Toyota Production System: Beyond Large-Scale Production. CRC Press. ISBN 978-0-915299-14-0.
  2. ^ Shingo, Shigeo. 1985. A Revolution in Manufacturing: The SMED System. Stamford, Ct.: Productivity Press
  3. ^ Heard, Ed. 1987. Short cycle manufacturing: the route to JIT. Target. 2 (3) (fall) 22–24.
  4. ^ High, W. 1987. Short cycle manufacturing (SCM) implementation: an approach taken at Motorola. Target, 3 (4) (Winter), 19–24.
  5. ^ Barkman, William E. 1989. In-Process Quality Control for Manufacturing. Boca Raton, Fl.: CRC Press.
  6. ^ Bowers, G.H., Jr. 1991. Continuous flow manufacturing. Proc. SPIE1496, 10th Annual Symposium on Microlithography. (March 1, 1991), 239–246.
  7. ^ Roebuck, Kevin. 2011. Business Process Modeling: High-impact Emerging Technology - What You Need to Know: Definitions, Adoptions, Impact, Benefits, Maturity, Vendors. Tebbo, p 32.
  8. ^ a b Goddard, Walter E. 1986. Just-in-Time: Surviving by Breaking Tradition. Essex Junction, Vt." Oliver Wight Ltd.
  9. ^ Womack, James P.; Jones, Daniel T.; Roos, Daniel (2007). The Machine That Changed the World: The Story of Lean Production. Simon and Schuster. ISBN 9781416554523. Retrieved May 24, 2017.
  10. ^ Black, J. Temple; Hunter, Steve, L. (2003). Lean Manufacturing Systems and Cell Design. Society of Manufacturing Engineers. p. 41. ISBN 9780872636477.
  11. ^ Hyer, Nancy; Wemmerlov, Urban (2001). Reorganizing the Factory: Competing Through Cellular Manufacturing. CRC Press. p. 41. ISBN 9781563272288. Lean manufacturing is a more recent name for JIT. As with JIT, lean manufacturing is deeply rooted in the automotive industry and focuses mostly on repetitive manufacturing situations."
  12. ^ Monden, Yasuhiro, ed. 1986. Applying Just in Time: The American/Japanese Experience. Norcross, Ga.: Institute of Industrial Engineers. This collection of JIT articles includes multiple references to TPS.
  13. ^ Womack, J.P. and D. Jones. 2003. Lean Thinking: Banish Waste and Create Wealth in Your Corporation. Revised. New York: Free Press. Numerous references to both lean and TPS.
  14. ^ Plenert, G. 2007.Reinventing Lean: Introducing Lean Management into the Supply Chain. Oxford, U.K.: Butterworth-Heinemann. pp 41–42.
  15. ^ Ashburn, A., 1977. Toyota's "famous Ohno system", American Machinist, July, 120–123.
  16. ^ Sugimori, Y.; Kusunoki, K.; Cho, F.; Uchikawa, S. (1977). "Toyota Production System and Kanban System: Materialization of Just-in-time and Respect-for-human System". 2016 Impact Factor 2.325 International Journal of Production Research. 15 (6): 553–564. doi:10.1080/00207547708943149. ISSN 0020-7543.
  17. ^ Hall. R.W. 2001. The founding of the Association for Manufacturing Excellence. Unpublished summary of Hall's presentation at a meeting of AME's founders on February 2.
  18. ^ Landvater, Darryl. 1984. "The rise and fall of just-in-time". Infosystems. November, p 62.
  19. ^ Goddard, W. 1982. "Kanban versus MRP II—which is best for you?" Modern Materials Handling. Nov 5, p 40-48.
  20. ^ Plossl, G.W. 1981. Japanese productivity: myth vs. reality. P&IM Review and APICS News, September, pp 59–62.
  21. ^ Plossl, G.W. 1984. The redirection of U.S. manufacturing. P&IM Review and APICS News. November, pp 50–53.
  22. ^ Plossl. G.W. 1986. "J.I.T. – fad or fact of life?" P&IM Review and APICS News, February 1986, p. 24.
  23. ^ Walters, C.R. 1984. Why everybody's talking about "just-in-time." Inc. (March 1) 77–90.
  24. ^ Sepehri, Mehran. 1986. Just-in-Time: Not Just in Japan: Case Studies of American Pioneers in JIT Implementation. Falls Church, Va.: American Production and Inventory Control Society
  25. ^ Mortimer, J. (1986). Just-in-Time: An Executive Briefing. Kempston, Bedford, UK: IFS Ltd.
  26. ^ a b Ingersoll Engineers. 1986. Just in Time Manufacturing: Proceedings of the First International Conference. London, UK. April 8–9.
  27. ^ Schniederjans, M.J. 1993. Topics in Just-in-Time Management. Needham Heights, Mass.: Allyn & Bacon
  28. ^ Jasinowski, Jerry, and Robert Hamrin. 1995. Making It in America: Proven Paths to Success from 50 Top Companies. New York: Simon & Schuster.
  29. ^ Kinni, T.B. 1996. America's Best Plants: Industry Week's Guide to World-Class Manufacturing Plants. New York: Wiley
  30. ^ Womack, James P., Jones, Daniel T., and Roos, Daniel. 1990. The Machine That Changed the World: The Story of Lean Production. New York: Rawson Associates.
  31. ^ Thomas, P.R. 1991. Getting Competitive: Middle Managers and the Cycle Time Ethic. New York: McGraw-Hill.
  32. ^ Blackburn, Joseph T. 1991. Time-based Competition: The Next Battleground in American Manufacturing. Homewood, Ill.; Business One Irwin, p 28.
  33. ^ Suri, R. 1998. Quick Response Manufacturing: A Companywide Approach to Reducing Lead Times. Portland, Ore.: Productivity Inc.
  34. ^ Hirano, Hiroyuki. and Makota Furuya. 2006. JIT Is Flow: Practice and Principles of Lean Manufacturing. Vancouver, Wash.: PCS Press,
  35. ^ Pettersen, Jan-Arne. 2010. "Pull Based Production Systems: Performance, Modeling and Analysis," doctoral thesis. Lulea, Sweden: Lulea University of Technology.
  36. ^ Harmon, R.L. 1993. Reinventing the Warehouse: World Class Distribution Logistics. New York: Free Press.
  37. ^ Lowson, B., R. King, and A. Hunter. 1999. Quick Response – Managing the Supply Chain to Meet Consumer Demand. Chichester, UK: Wiley.
  38. ^ Hines, T. 2001. "From analogue to digital supply chains: Implications for fashion marketing ," in Fashion Marketing: Contemporary Issues. eds, T. Hines and M. Bruce. Oxford: Butterworth Heinemann, 26–47.
  39. ^ Hines, T. 2004. Supply Chain Strategies: Customer Driven and Customer Focused. Oxford, UK: Elsevier.
  40. ^ Sepheri, M., p. 277.[full citation needed]
  41. ^ Grahovec, D. and Bernie Ducan, Jerry Stevenson, Colin Noone. 1999. How lean focused factories enabled Daman to regain responsiveness and become more agile. Target. 4th quarter, pp 47–51.
  42. ^ Caulkin, Simon. 1990. Britain's best factories. Management Today. November 60–89.
  43. ^ Simpson, Alex. Effective just-in-time manufacture at Hewlett-Packard. In Mortimer (1986), pp. 123–128.
  44. ^ Williams, John T. "Pros & Cons of the JIT Inventory System". Houston Chronicle. Supply-chain relationships require retooling that involves multiple suppliers, closer locations, or companies that can supply materials with little advance notice. Companies ordering smaller amounts of goods may encounter difficulty meeting minimum orders, requiring a different contract or a way to break up a large order over time or among several smaller manufacturers.
  45. ^ L., Kalleberg, A. (2009). "Precarious Work, Insecure Workers: Employment Relations in Transition". American Sociological Review. 74 (1): 1–22. CiteSeerX 10.1.1.1030.231. doi:10.1177/000312240907400101. ISSN 0003-1224.
  46. ^ https://www.investopedia.com/ask/answers/040215/what-are-main-problems-jit-just-time-production-strategy.asp
  47. ^ https://www.reuters.com/article/us-japan-supplychain-sp/special-report-disasters-show-flaws-in-just-in-time-production-idUSTRE72K5AL20110321
  48. ^ https://science.nasa.gov/science-news/science-at-nasa/2009/21jan_severespaceweather/
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