Thursday, September 8, 2022

Lean Six Sigma



JIT as practiced in Toyota was an attack on delays recorded in flow process charts. Both temporary delays and permanent delay were attacked by Ohno and his team to develop the Toyota production system (TPS) which was able to produce cars at a lower cost compared to US companies. Toyota managers implement productivity improvement and cost reduction in a rational manner targeting those areas which they identified as barriers to improving productivity when all existing industrial egineering techniques were applied by Toyota similar to the practices of US companies. That is why Ohno said, "Industrial Engineering is Profit Engineering."

The Toyota Production System was described as Lean System by MIT researchers and they could attract the attention of large number of companies to follow their advice and consultancy. But slowly disappointment has set in.

Six Sigma process of improvement of processes was developed in Motorola. Allied Signal implemented it successfully and from them GE got the learning and implemented with a big success.

Now there is a movement to combine them both into lean six sigma.  For industrial engineers,  it is only an incremental improvement of their area. Lean advocates only copied the philosophy of industrial engineering which is elimination of waste by responding to industry and economy data and tried to position as a method that is different from IE.

Combination of Lean and Six Sigma


Lean focuses on identifying and eliminating waste in the flow. Delays related to waiting of individual parts, batch of parts on the processing floor and storage in the stores are waste in the the material flow system. Eliminating them requires modification or improvement processes. Six Sigma reduces process variability that produced defects. Possibility of defects, increases batch quantities and also stock in stores.  When combined, the result is a methodology that serves to improve processes, eliminates product or process defects and to reduce cycle times and thus reduce cost of production. .

Best Practices in Lean Six Sigma Process Improvement

Richard J. Schonberger
John Wiley & Sons, 03-Mar-2008 - Business & Economics - 368 pages
Best Practices in Lean Six Sigma Process Improvement reveals how to refocus lean/six sigma processes on what author Richard Schonberger—world-renowned process improvement pioneer—calls "the Golden Goals": better quality, quicker response, greater flexibility, and higher value. This manual shows you how it can be done, employing success stories of over 100 companies including Apple, Illinois Tool Works, Dell, Inc., and Wal-Mart, all of which have established themselves as the new, global "Kings of Lean," surpassing even Toyota in long-term improvement.
Google Book Link with preview facility
http://books.google.co.in/books?id=0-2PQXOBavMC


TABLE OF CONTENTS
Preface.
Part I. Hypercompetition.

Chapter 1. Magnitude Advances In Competitive Standards And Technologies.

Chapter 2. Global Leanness -- An Unstable Phenomenon.

Chapter 3. Big Question: Does Lean Beget Financial Success? (A Short Chapter).

Chapter 4. Ultimate Trend: Improving The Rate Of Improvement.

Part II. Improvement Gone Wrong -- And Made Right.

Chapter 5. Waste Elimination, Kaizen, And Continuous Improvement: Mis-Defined And Misunderstood.

Chapter 6. The Metrics Trap.

Chapter 7. The Case Against (Much Of) Management Goal-Setting.

Part III. A Competitive Fortress.

Chapter 8. Fortress By Culture.

Chapter 9. Vengeful Numbers.

Chapter 10. Process Improvement: Stretching Company Capabilities.

Chapter 11. Unique Business Models (Big Ideas).

Part IV. What Goes Wrong: Impressive Companies And Their Weak Spots.

Chapter 12. Does Rapid Growth Put The Brakes On Lean?

Chapter 13. Losing Their Way—Or Not.

Part V. Leanness: A Changing Landscape.

Chapter 14. Global "Lean" Champions: Passing The Torch.

Chapter 15. How Overweight Companies Get Lean.

Chapter 16. Flow-Through Facilities.

Chapter 17. External Linkages.

Part VI. Why Industries Rank Where They Do.

Chapter 18. Leanness Rankings For 33 Industrial Sectors.

Chapter 19. Electronics: A Metamorphosis.

Chapter 20. Motor-Vehicle Industry: Earliest But Lagging.

Chapter 21. Aerospace-Defense: OEM's Soaring, Suppliers Not.

Chapter 22. Other Industries.

Epilogue.


Author Richard Schonberger points out, Japanese companies on the whole have a poor track record of being able to sustain a lean trend. What's more, Toyota has fallen victim to overbloated inventories for more than a dozen years, and in an astonishing chart, lean's "platinum standard" ranks at the very bottom of 55 global vehicle manufacturers on the scale of long-term inventory turnover.

The Evolution of Six Sigma
http://asq.org/pub/sixsigma/past/vol2_issue4/folaron.html

Lean Six Sigma Chapter
https://www.researchgate.net/publication/255910300_Lean_Six_Sigma


101 Things A Six Sigma Black Belt Should Know By Thomas Pyzdek

1. A Six Sigma Black Belt should be quantitatively oriented and must have ability to develop descriptive statistics and do statistical analysis.
2. With minimal guidance, the Six Sigma Black Belt should be able to use data to convert broad generalizations into actionable goals.
3. The Six Sigma Black Belt should be able to make the business case for attempting to accomplish these goals.
4. The Six Sigma Black Belt should be able to develop detailed plans for achieving these goals.
5. The Six Sigma Black Belt should be able to measure progress towards the goals in terms meaningful to customers and leaders.

6. The Six Sigma Black Belt should know how to establish control systems for maintaining the gains achieved through Six Sigma.
7. The Six Sigma Black Belt should understand and be able to communicate the rationale for continuous improvement, even after initial goals have been accomplished.
8. The Six Sigma Black Belt should be familiar with research that quantifies the benefits firms have obtained from Six Sigma.
9. The Six Sigma Black Belt should know or be able to find the PPM rates associated with different sigma levels (e.g., Six Sigma = 3.4 PPM)
10. The Six Sigma Black Belt should know the approximate relative cost of poor quality associated with various sigma levels (e.g., three sigma firms report 25% COPQ).

11. The Six Sigma Black Belt should understand the roles of the various people involved in change (senior leader, champion, mentor, change agent, technical leader, team leader, facilitator).
12. The Six Sigma Black Belt should be able to design, test, and analyze customer surveys.
13. The Six Sigma Black Belt should know how to quantitatively analyze data from employee and customer surveys. This includes evaluating survey reliability and validity as well as the differences between surveys.
14. Given two or more sets of survey data, the Six Sigma Black Belt should be able to determine if there are statistically significant differences between them.
15. The Six Sigma Black Belt should be able to quantify the value of customer retention.

16. Given a partly completed QFD matrix, the Six Sigma Black Belt should be able to complete it.
17. The Six Sigma Black Belt should be able to compute the value of money held invested in six sigma projects over time, including present values and future values. 
18. The Six Sigma Black Belt should be able to compute present value and future value for various compounding periods.
19. The Six Sigma Black Belt should be able to compute the break even point for a project.
20. The Six Sigma Black Belt should be able to compute the net present value of cash flow streams, and to use the results to choose among competing projects.
21. The Six Sigma Black Belt should be able to compute the internal rate of return for cash flow streams and to use the results to choose among competing projects.


22. The Six Sigma Black Belt should know the COPQ rationale for Six Sigma, i.e., he should be able to explain what to do if COPQ analysis indicates that the optimum for a given process is less than Six Sigma.
23. The Six Sigma Black Belt should know the basic COPQ categories and be able to allocate a list of costs to the correct category.
24. Given a table of COPQ data over time, the Six Sigma Black Belt should be able to perform a statistical analysis of the trend.
25. Given a table of COPQ data over time, the Six Sigma Black Belt should be able to perform a statistical analysis of the distribution of costs among the various categories.

26. Given a list of tasks for a project, their times to complete, and their precedence relationships, the Six Sigma Black Belt should be able to compute the time to completion for the project, the earliest completion times, the latest completion times and the slack times. He should also be able to identify which tasks are on the critical path.
27. Give cost and time data for project tasks, the Six Sigma Black Belt should be able to compute the cost of normal and crash schedules and the minimum total cost schedule.
28. The Six Sigma Black Belt should be familiar with the basic principles of benchmarking.
29. The Six Sigma Black Belt should be familiar with the limitations of benchmarking.
30. Given an organization chart and a listing of team members, process owners, and sponsors, the Six Sigma Black Belt should be able to identify projects with a low probability of success.

31. The Six Sigma Black Belt should be able to identify measurement scales of various metrics (nominal, ordinal, etc).
32. Given a metric on a particular scale, the Six Sigma Black Belt should be able to determine if a particular statistical method should be used for analysis.
33. Given a properly collected set of data, the Six Sigma Black Belt should be able to perform a complete measurement system analysis, including the calculation of bias, repeatability, reproducibility, stability, discrimination (resolution) and linearity.
34. Given the measurement system metrics, the Six Sigma Black Belt should know whether or not a given measurement system should be used on a given part or process.
35. The Six Sigma Black Belt should know the difference between computing sigma from a data set whose production sequence is known and from a data set whose production sequence is not known.

36. Given the results of an AIAG Gage R&R study, the Six Sigma Black Belt should be able to answer a variety of questions about the measurement system.
37. Given a narrative description of "as-is" and "should-be" processes, the Six Sigma Black Belt should be able to prepare process maps.
38. Given a table of raw data, the Six Sigma Black Belt should be able to prepare a frequency tally sheet of the data, and to use the tally sheet data to construct a histogram.
39. The Six Sigma Black Belt should be able to compute the mean and standard deviation from a grouped frequency distribution.
40. Given a list of problems, the Six Sigma Black Belt should be able to construct a Pareto Diagram of the problem frequencies.

41. Given a list which describes problems by department, the Six Sigma Black Belt should be able to construct a Crosstabulation and use the information to perform a Chi-square analysis.
42. Given a table of x and y data pairs, the Six Sigma Black Belt should be able to determine if the relationship is linear or non-linear.
43. The Six Sigma Black Belt should know how to use non-linearity's to make products or processes more robust.
44. The Six Sigma Black Belt should be able to construct and interpret a run chart when given a table of data in time-ordered sequence. This includes calculating run length, number of runs and quantitative trend evaluation.
45. When told the data are from an exponential or Erlang distribution the Six Sigma Black Belt should know that the run chart is preferred over the standard X control chart.
46. Given a set of raw data the Six Sigma Black Belt should be able to identify and compute two statistical measures each for central tendency, dispersion, and shape.
47. Given a set of raw data, the Six Sigma Black Belt should be able to construct a histogram.
48. Given a stem & leaf plot, the Six Sigma Black Belt should be able to reproduce a sample of numbers to the accuracy allowed by the plot.
49. Given a box plot with numbers on the key box points, the Six Sigma Black Belt should be able to identify the 25th and 75th percentile and the median.
50. The Six Sigma Black Belt should know when to apply enumerative statistical methods, and when not to.

51. The Six Sigma Black Belt should know when to apply analytic statistical methods, and when not to.
52. The Six Sigma Black Belt should demonstrate a grasp of basic probability concepts, such as the probability of mutually exclusive events, of dependent and independent events, of events that can occur simultaneously, etc.
53. The Six Sigma Black Belt should know factorials, permutations and combinations, and how to use these in commonly used probability distributions.
54. The Six Sigma Black Belt should be able to compute expected values for continuous and discrete random variables.
55. The Six Sigma Black Belt should be able to compute univariate statistics for samples.

56. The Six Sigma Black Belt should be able to compute confidence intervals for various statistics.
57. The Six Sigma Black Belt should be able to read values from a cumulative frequency ogive.
58. The Six Sigma Black Belt should be familiar with the commonly used probability distributions, including: hypergeometric, binomial, Poisson, normal, exponential, chi-square, Student's t, and F.
59. Given a set of data the Six Sigma Black Belt should be able to correctly identify which distribution should be used to perform a given analysis, and to use the distribution to perform the analysis.
60. The Six Sigma Black Belt should know that different techniques are required for analysis depending on whether a given measure (e.g., the mean) is assumed known or estimated from a sample. The Six Sigma Black Belt should choose and properly use the correct technique when provided with data and sufficient information about the data.

61. Given a set of subgrouped data, the Six Sigma Black Belt should be able to select and prepare the correct control charts and to determine if a given process is in a state of statistical control.
62. The above should be demonstrated for data representing all of the most common control charts.
63. The Six Sigma Black Belt should understand the assumptions that underlie ANOVA, and be able to select and apply a transformation to the data.
64. The Six Sigma Black Belt should be able to identify which cause on a list of possible causes will most likely explain a non-random pattern in the regression residuals.
65. If shown control chart patterns, the Six Sigma Black Belt should be able to match the control chart with the correct situation (e.g., an outlier pattern vs. a gradual trend matched to a tool breaking vs. a machine gradually warming up).

66. The Six Sigma Black Belt should understand the mechanics of PRE-Control.
67. The Six Sigma Black Belt should be able to correctly apply EWMA charts to a process with serial correlation in the data.
68. Given a stable set of subgrouped data, the Six Sigma Black Belt should be able to perform a complete Process Capability Analysis. This includes computing and interpreting capability indices, estimating the % failures, control limit calculations, etc.
69. The Six Sigma Black Belt should demonstrate an awareness of the assumptions that underlie the use of capability indices.
70. Given the results of a replicated 22 full-factorial experiment, the Six Sigma Black Belt should be able to complete the entire ANOVA table.

71. The Six Sigma Black Belt should understand the basic principles of planning a statistically designed experiment. This can be demonstrated by critiquing various experimental plans with or without shortcomings.
72. Given a "clean" experimental plan, the Six Sigma Black Belt should be able to find the correct number of replicates to obtain a desired power.
73. The Six Sigma Black Belt should know the difference between the various types of experimental models (fixed-effects, random-effects, mixed).
74. The Six Sigma Black Belt should understand the concepts of randomization and blocking.
75. Given a set of data, the Six Sigma Black Belt should be able to perform a Latin Square analysis and interpret the results.

76. Ditto for one way ANOVA, two way ANOVA (with and without replicates), full and fractional factorials, and response surface designs.
77. Given an appropriate experimental result, the Six Sigma Black Belt should be able to compute the direction of steepest ascent.
78. Given a set of variables each at two levels, the Six Sigma Black Belt can determine the correct experimental layout for a screening experiment using a saturated design.
79. Given data for such an experiment, the Six Sigma Black Belt can identify which main effects are significant and state the effect of these factors.
80. Given two or more sets of responses to categorical items (e.g., customer survey responses categorized as poor, fair, good, excellent), the Six Sigma Black Belt will be able to perform a Chi-Square test to determine if the samples are significantly different.

81. The Six Sigma Black Belt will understand the idea of confounding and be able to identify which two factor interactions are confounded with the significant main effects.
82. The Six Sigma Black Belt will be able to state the direction of steepest ascent from experimental data.
83. The Six Sigma Black Belt will understand fold over designs and be able to identify the fold over design that will clear a given alias.
84. The Six Sigma Black Belt will know how to augment a factorial design to create a composite or central composite design.
85. The Six Sigma Black Belt will be able to evaluate the diagnostics for an experiment.

86. The Six Sigma Black Belt will be able to identify the need for a transformation in y and to apply the correct transformation.
87. Given a response surface equation in quadratic form, the Six Sigma Black Belt will be able to compute the stationary point.
88. Given data (not graphics), the Six Sigma Black Belt will be able to determine if the stationary point is a maximum, minimum or saddle point.
89. The Six Sigma Black Belt will be able to use a quadratic loss function to compute the cost of a given process.

90. The Six Sigma Black Belt will be able to conduct simple and multiple linear regression.
91. The Six Sigma Black Belt will be able to identify patterns in residuals from regression model and to apply the correct remedy as needed to correct the regression results.
92. The Six Sigma Black Belt will understand the difference between regression and correlation studies.
93. The Six Sigma Black Belt will be able to perform chi-square analysis of contingency tables.
94. The Six Sigma Black Belt will be able to compute basic reliability statistics (mtbf, availability, etc.).
95. Given the failure rates for given subsystems, the Six Sigma Black Belt will be able to use reliability apportionment to set mtbf goals.

96. The Six Sigma Black Belt will be able to compute the reliability of series, parallel, and series-parallel system configurations.
97. The Six Sigma Black Belt will demonstrate the ability to create and read an FMEA analysis.
98. The Six Sigma Black Belt will demonstrate the ability to create and read a fault tree.
99. Given distributions of strength and stress, the Six Sigma Black Belt will be able to compute the probability of failure.
100. The Six Sigma Black Belt will be able to apply statistical tolerancing to set tolerances for simple assemblies. He will know how to compare statistical tolerances to so-called "worst case" tolerancing.
101. The Six Sigma Black Belt will be aware of the limits of the Six Sigma approach.
https://indianoperations.blogspot.com/2010/03/101-things-six-sigma-black-belt-should.html



A novel and practical conceptual framework to support Lean Six Sigma deployment in manufacturing SMEs
Paul Alexander,Jiju AntonyORCID Icon &Elizabeth CudneyORCID Icon
Pages 1233-1263 | Published online: 16 Jul 2021
Total Quality Management & Business Excellence 
Volume 33, 2022 - Issue 11-12
https://www.tandfonline.com/eprint/REVUNXWFKDXY4CSPAASZ/full?target=10.1080/14783363.2021.1945434


Updated on 8.9.2022,  25 November 2021,  2 September 2021, 5 July 2019,  26 June 2019, 29 August 2013



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