Just-in-time manufacturing

Just-in-time (JIT) manufacturing, also known as just-in-time production or the Toyota production system (TPS), is a methodology aimed primarily at reducing flow times within production as well as response times from suppliers and to customers. Following its origin and development in Japan, largely in the 1960s and 1970s and particularly at Toyota,[1][2] JIT migrated to Western industry in the 1980s, where its features were put into effect in many manufacturing companies—as is attested to in several books[3][4][5][6][7] and compendia of case studies and articles from the 1980s.[8][9][10][11]

Alternative terms for JIT manufacturing have been used. Motorola's choice was short-cycle manufacturing (SCM).[12][13] IBM's was continuous-flow manufacturing (CFM),[14][15] and demand-flow manufacturing (DFM), a term handed down from consultant John Constanza at his Institute of Technology in Colorado.[16] 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.[4]: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[17][18] as "a more recent name for JIT."[19]:41 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.[20][21]

Concept

The nature of just-in-time, meaning JIT manufacturing/production or JIT in any other setting (e.g., administration[22][23]), may be reduced to four somewhat differently stated views.

The four JIT views—referring to wastes, kanban, inventory, and quick response/lead-time reduction—do not suggest opposing views, but rather appear to be complementary points of emphasis, collectively serving to describe the essence of JIT.

Aside from the four viewpoints, Just in time has often been paired with total quality control, forming the acronym, JIT/TQC.[32][33][34] The rationale is that TQC avoids stoppages and slowdowns disruptive to the quick-flow aims of JIT; and JIT exposes quality issues and their causes soon after they occur, thus facilitating their elimination.

Methodology

Sepheri provides a list of methodologies of JIT manufacturing that "are important but not exhaustive":[35]

Voss and Clutterbuck offer, in a different style, their own list of "some" of JIT's methodologies,[10] That list, following, includes citations from other sources.

Two notable elements of JIT purchasing that could be separately listed are single-sourcing and "milk runs."

One item missing from the Voss and Clutterbuck list, is visual management (on Sepheri's list as "housekeeping" and as "control by visibility): everything orderly, simple, and easily seen and found[28]:237–240 – formalized as the 5 S's (referring to five ways to make things visible, clean, and orderly).[38][39]

History

"Exactly how JIT emerged as an approach to manufacturing management is obscured in an inevitable cloud of mythology [though] it is clear that its development was primarily in Japan . . . ." The author of that statement goes on to say that the first to use JIT was not Toyota but was Japan's shipyards, "which wanted to establish firmer control over the deliver of steel plate and fittings . . . .",[40] a point echoed by Goddard.[4]:11

Evolution in Japan

The exact reasons for JIT evolution 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.[41]

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.[42] The other article, by Toyota authors in an international journal, provided additional details.[43] 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.[44]

At least some of audience's stirring had to do with a perceived clash between the new JIT regime and MRP II (material requirements planning II), a computer software-based system of manufacturing planning and control that 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."[45] Less confrontational was Walt Goddard's, "Kanban Versus MRP II—Which Is Best for You?" in 1982.[46] Four years later Goddard had answered his own question with a book advocating JIT.[4] Among the best known of MRP II's advocates was George Plossl, who authored two articles questioning JIT's kanban planning method[47] and the "japanning of America."[48] But, as with Goddard, Plossl later wrote that "JIT is a concept whose time has come."[49]

JIT/TPS implementations may be found in many case-study articles from the 1980s and beyond. One article in a 1984 issue of Inc. magazine[50] relates how Omark Industries (chain saws, ammunition, log loaders, etc.) emerged as an extensive JIT implementer—under its 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, Minn., "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 & Decker."

By 1986 a case-study book on JIT in the U.S.[8] 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 Macintosh, 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.[9] 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,[51] 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."[51]:J1–J9

Middle era and to the present

Three more books that include JIT implementations were published in 1993,[52] 1995,[11] and 1996,[53] 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.[54] That one, along with other books, articles, and case studies on lean, were supplanting JIT terminology in the 1990s and beyond. The same period, however, saw the rise of books and articles with similar concepts and methodologies but with alternative names, including cycle time management,[30] time-based competition,[29] quick-response manufacturing,[55] flow,[56] and pull-based production systems.[57]

However, 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.[58] And a manufacturer-to-retailer model developed in the U.S. in the 1980s, referred to as quick response,[59] has morphed over time to what is called fast fashion.[60][61]

JIT implementation design

Based on a diagram modeled after the one used by Hewlett-Packard's Boise plant to accomplish its JIT program.

  1. F. Design Flow Process
    • F. Redesign/relayout for flow
    • L. Reduce lot sizes
    • O. Link operations
    • W. Balance workstation capacity
    • M. Preventive maintenance
    • S. Reduce setup Times
  2. Q. Total Quality Control
    • C. worker compliance
    • I. Automatic inspection
    • M. quality measures
    • M. fail-safe methods
    • W. Worker participation
  3. S. Stabilize Schedule
    • S. Level schedule
    • W. Establish freeze windows
    • UC. Underutilize Capacity
  4. K. Kanban Pull System
    • D. Demand pull
    • B. Backflush
    • L. Reduce lot sizes
  5. V. Work with Vendors
    • L. Reduce lead time
    • D. Frequent deliveries
    • U. Project usage requirements
    • Q. Quality expectations
  6. I. Further Reduce Inventory in Other Areas
    • S. Stores
    • T. Transit
    • C. Implement carrousel to reduce motion waste
    • C. Implement conveyor belts to reduce motion waste
  7. P. Improve Product Design
    • P. Standard production configuration
    • P. Standardize and reduce the number of parts
    • P. Process design with product design
    • Q. Quality expectations

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.[62]

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.[63]

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.[64] 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%

Among general discussions of JIT's objectives and benefits is this from Malakooti[65]

See also

Further reading

References

  1. Ohno, T. 1978. Toyota Production System—Beyond Management of Large-Scale Production. Tokyo: Diamond Publishing (in Japanese).
  2. 1 2 Shingo, Shigeo. 1985. A Revolution in Manufacturing: The SMED System. Stamford, Ct.: Productivity Press.
  3. Hall, Robert W. 1983. Zero Inventories. Homewood, Ill., Dow Jones-Irwin.
  4. 1 2 3 4 Goddard, Walter E. 1986. Just-in-Time: Surviving by Breaking Tradition. Essex Junction, Vt." Oliver Wight Ltd.
  5. Suzaki, Kyoshi. 1987. The New Manufacturing Challenge: Techniques for Continuous Improvement. New York: Free Press
  6. 1 2 3 Hall, Robert W. 1987. Attaining Manufacturing Excellence: Just-in-Time, Total Quality, Total People Involvement. Homewood, Ill.: Dow Jones-Irwin.
  7. Hay, Edward J. 1988. The Just-in-Time Breakthrough: Implementing the New Manufacturing Basics. New York: Wiley.
  8. 1 2 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
  9. 1 2 Mortimer, J. (1986). Just-in-Time: An Executive Briefing. Kempston, Bedford, UK: IFS Ltd.
  10. 1 2 Voss, Chris, and David Clutterbuck. 1989. Just-in-Time: A Global Status Report. UK: IFS Publications.
  11. 1 2 Jasinowski, Jerry, and Robert Hamrin. 1995. Making It in America: Proven Paths to Success from 50 Top Companies. New York: Simon & Schuster.
  12. Heard, Ed. 1987. Short cycle manufacturing: the route to JIT. Target. 2 (3) (fall) 22–24.
  13. High, W. 1987. Short cycle manufacturing (SCM) implementation: an approach taken at Motorola. Target, 3 (4) (Winter), 19–24.
  14. Barkman, William E. 1989. In-Process Quality Control for Manufacturing. Boca Raton, Fl.: CRC Press.
  15. Bowers, G.H., Jr. 1991. Continuous flow manufacturing. Proc. SPIE1496, 10th Annual Symposium on Microlithography. (March 1, 1991), 239–246.
  16. Roebuck, Kevin. 2011. Business Process Modeling: High-impact Emerging Technology—What You Need to Know: Definitions, Adoptions, Impact, Benefits, Maturity, Vendors. Tebbo, p 32.
  17. Womack, James P., Jones, Daniel T., and Roos, Daniel (1991), The Machine That Changed the World: The Story of Lean Production, HarperBusiness, 2003, ISBN 0-06-097417-6.
  18. Black, J.T., and S.L. Hunter. 2003. Lean Manufacturing Systems and Cell Design. Dearborn, Mich.: Society of Manufacturing Engineers, 205, 307–326.
  19. 1 2 Hyer, Nancy, and Urban Wemmerlöv. 2002. Reorganizing the Factory: Competing through Cellular Manufacturing, New York: Productivity Press.
  20. 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.
  21. 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.
  22. 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.
  23. Jackson, Paul. 1991. White collar JIT at Security Pacific. Target. 7 (1), Spring, 32–37.
  24. Shingo, Shigeo. 1981. Study of 'TOYOTA' Production System from Industrial Engineering Viewpoint. Tokyo: Japan Management Association. 287–291.
  25. 1 2 Japan Management Association, ed. D.J. Lu trans. 1985. Kanban: Just-in-Time at Toyota: Management Begins at the Workplace. Stamford, Ct.: Productivity Press.
  26. Murray, John. Manufacturing excellence through JIT, p 101-103, in Mortimer (1986).
  27. Suri, R. 1986. Getting from 'just in case' to 'just in time': insights from a simple model. 6 (3) 295–304.
  28. 1 2 3 4 5 6 7 Hall, R. W. 1983. Zero Inventories. Homewood, Ill.: Dow Jones-Irwin.
  29. 1 2 Blackburn, Joseph T. 1991. Time-based Competition: The Next Battleground in American Manufacturing. Homewood, Ill.; Business One Irwin, p 28.
  30. 1 2 Thomas, P.R. 1991. Getting Competitive: Middle Managers and the Cycle Time Ethic. New York: McGraw-Hill.
  31. Bicheno, J.R. 1987. A framework for JIT implementation. in C. Voss (ed.), Just-in-Time Manufacture. London: IPS, pp. 191-204.
  32. Hohner, Gregory. 1988. JIT/TQC: integrating product design with shop floor effectiveness. Industrial Engineering. 20 (9) (September 1988), 42–48.
  33. Goddard, W.E. 2001. JIT/TQC—identifying and solving problems. Proceedings of the 20th Electrical Electronics Insulation Conference, Boston, October 7–10, 88–91.
  34. 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.
  35. Sepheri, M., p. 277.
  36. Nakajima, S. 1984. Introduction to TPM: Total Productive Maintenance. Cambridge, Mass.: Productivity Press.
  37. Ansari, A. and B. Modarress. 1990. Just in Time Purchasing. New York: Free Press.
  38. Hirano, H. 1994. Five Pillars of the Visual Workplace. Cambridge, Mass.: Productivity Inc.
  39. Galsworth, G. 2005. Visual Workplace: Visual Thinking. Portland, Ore.: Visual-Lean Enterprise Press.
  40. Voss, C. and D. Clutterbuck. 1989. op cit., p 19
  41. Plenert, G. 2007.Reinventing Lean: Introducing Lean Management into the Supply Chain. Oxford, U.K.: Butterworth-Heinemann. pp 41–42.
  42. Ashburn, A., 1977. Toyota's "famous Ohno system." American Machinist, July, 120–123.
  43. Sugimori, Y., et al, Toyota production system and kanban system: materialization of just-in-time and respect-for-human system, International Journal of Production Research. 15 (1977) 553–564.
  44. 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.
  45. Landvater, Darryl. 1984. "The rise and fall of just-in-time". Infosystems. November, p 62.
  46. Goddard, W. 1982. "Kanban versus MRP II—which is best for you?" Modern Materials Handling. Nov 5, p 40-48.
  47. Plossl, G.W. 1981. Japanese productivity: myth vs. reality. P&IM Review and APICS News, September, pp 59–62.
  48. Plossl, G.W. 1984. The redirection of U.S. manufacturing. P&IM Review and APICS News. November, pp 50–53.
  49. Plossl. G.W. 1986. "J.I.T. – fad or fact of life?" P&IM Review and APICS News, February 1986, p. 24.
  50. Walters, C.R. 1984. Why everybody's talking about "just-in-time." Inc. (March 1) 77–90.
  51. 1 2 Ingersoll Engineers. 1986. Just in Time Manufacturing: Proceedings of the First International Conference. London, UK. April 8–9.
  52. Schniederjans, M.J. 1993. Topics in Just-in-Time Management. Needham Heights, Mass.: Allyn & Bacon
  53. Kinni, T.B. 1996. America's Best Plants: Industry Week's Guide to World-Class Manufacturing Plants. New York: Wiley
  54. 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.
  55. Suri, R. 1998. Quick Response Manufacturing: A Companywide Approach to Reducing Lead Times. Portland, Ore.: Productivity Inc.
  56. Hirano, Hiroyuki. and Makota Furuya. 2006. JIT Is Flow: Practice and Principles of Lean Manufacturing. Vancouver, Wash.: PCS Press,
  57. Pettersen, Jan-Arne. 2010. "Pull Based Production Systems: Performance, Modeling and Analysis," doctoral thesis. Lulea, Sweden: Lulea University of Technology.
  58. Harmon, R.L. 1993. Reinventing the Warehouse: World Class Distribution Logistics. New York: Free Press.
  59. Lowson, B., R. King, and A. Hunter. 1999. Quick Response – Managing the Supply Chain to Meet Consumer Demand. Chichester, UK: Wiley.
  60. 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.
  61. Hines, T. 2004. Supply Chain Strategies: Customer Driven and Customer Focused. Oxford, UK: Elsevier.
  62. 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.
  63. Caulkin, Simon. 1990. Britain's best factories. Management Today. November 60–89.]
  64. Simpson, Alex. Effective just-in-time manufacture at Hewlett-Packard. In Mortimer (1986), pp. 123–128.
  65. Malakooti, Behnam. 2013. Operations and Production Systems with Multiple Objectives. New York: John Wiley & Sons.
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