Venugopal R
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Name
Venugopal R

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Benchmark Six Sigma

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Principal Consultant
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Benchmark Six Sigma Expert View by Venugopal R First and foremost priority of any business owner/leader will be to ensure the health and safety of their employees and their families. Almost every organization will have Emergency handling procedures, Business Continuity Plans and Disaster Recovery policies. Emergencies do erupt as may types, viz. Limited to the organization, one or more sites (eg. a Server issue or major failure of certain equipment) Problem that has affected the region (Eg. Flood or other natural calamity, political issues, epidemic) Situation that has impacted the entire nation (Eg. Political issues) Situation that impacts movement / logistics, but not health or safety of employees (Transportation breakdown, connectivity issues) Today, we have a situation that is beyond the limits of those listed above. We have a crisis that is not restricted to geographies but threatens to cripple the entire world. It impacts not only an organization, but its customers and service providers as well. It concerns individual safety and at the same time people are bound by various restrictions imposed mainly in the interest of society at large. Many of the measures undertaken by organization during their past experiences would apply, but current situation probably demands much more, and unlikely to have a comparable past experience. Some of the measures that could be taken and are being exercised by many organizations include: Streamlining and channelizing communications regarding the current situation. Most reliable information updates are required both by the decision makers and for the overall employees. Make sure every one tunes into a common source of information to avoid unwieldy spread of rumors and confusion. Identify a emergency handling team who will represent the entire organization for taking key decisions, communicating and leading selected sections during the crisis period. Ensure that this team is introduced to all employees. While employees may be given the freedom of providing inputs / communications relating to the crisis, ensure that such communications are streamlined through the emergency handling team. Draft communication to customers and other stakeholders on the company’s strategy to maintain their deliveries and let them know how they would be kept informed about periodic updates. In the event of limitations on capacities, discuss with clients to understand their priorities, so that the limited capacities can focus on the highest priorities. Ensure that the organization is well informed and complies with any regulatory requirements by law at any point of time. Specific to current pandemic, ensure that aggressive measures are taken for ensuring necessary hygiene – viz. Hand sanitizing while entering the work place, frequent wiping of door handles, elevators, staircase railings, conference room furniture, pens, projector remotes, key boards, mouse, restroom faucets and all other points of human contact. Ensure adequate communication to all employees and visitors about the hygiene practices and provide sufficient visual displays, audio visuals and any other effective means. Considering that the current pandemic has affected worldwide, one of the common business continuity strategy of providing alternate processing at different geographies may not be effective. “Work from Home” is a very popular means adopted by companies where possible depending on the nature of work. This would be possible mostly for certain types of IT companies but would not apply for operations for manufacturing sector. Even if the company is able to permit limited employees to work in the offices / factories in compliance the regulations, the company has a grave responsibility to protect not only their employees but also any impact to society as well. Adequate check points and action plans need to be evolved to ensure the same. Necessary notification to the concerned regulatory authorities needs to be provided as required to ensure that the company does not violate any legal requirement. The emergency team (or core team) has to be in constant touch and should meet through video conferencing or other means everyday or even multiple times during a day to keep updating and reviewing their plans and actions continually Once the emergency situation eases, the leadership team will have to revisit their annual budgets and review the decisions on capital, new hire and other spend. Revision of strategies regarding product mix, launching of new products etc. will have to be reviewed in view of making up for the lost hours and profits. It is quite possible that the customers too would have rapid revision of their plans and requirements during the crisis period; it is important for the customer relations personnel to be in touch with them for constant update of their requirements, which need to be linked to the company’s plans and to the available capacities. There has to be real time dashboard which is likely to change dynamically. Some companies have a practice of collecting a very small amount from every employee and they build a corpus for supporting any employee(s), in the event of getting personally impacted. Such practices may be considered in long run.

Benchmark Six Sigma Expert View by Venugopal R Confidence interval is an estimated interval calculated from a set of observed data within which the a population parameter (e.g. Mean) is expected to fall with a given confidence level (e.g. 95%). It is to be remembered that the confidence interval is used for estimating the position of the population mean and not an individual value from the population. Predictive interval is an estimated interval within which an individual future value from a population is ‘predicted’ to fall with a certain probability. Confidence intervals give rise to a degree of certainty / uncertainty with respect to a sampling method. It provides the limits within which a population parameter will be contained. The mean value of a sample taken from a population provides a ‘point’ estimate. Imagine a large lot of apples and we need to estimate the mean weight of the apples in the population. If we take a random sample from the population and measure the mean value as 300 grams, this value is a point estimate of the population and will be subjected to uncertainties. While we may not be able to obtain the real value of the population mean unless we weigh all the apples, we can make the point estimate practically more useful by providing confidence intervals around it within which the mean population is expected to fall with a specified confidence level. This is possible by using the sample mean, sample standard deviation and assuming normal distribution. One of the common applications of confidence intervals is during the tests for significance for means. A common misconception about the Confidence Interval is that it is sometimes wrongly interpreted that they represent the percentage of individual values that fall within them 95% of the time (if the confidence level is at 95%). Coming to Prediction intervals, as defined earlier, they represent the intervals for individual future value from the population. Since the variation of the individual values will be much larger than the mean values, the Prediction Intervals will be wider than the confidence intervals. Prediction intervals are usually used during regression analysis. Prediction intervals are preferred for many situations than the confidence intervals, since they provide the estimates for an individual observation rather than unobservable population parameter. The below graph shows a fitted regression plot depicting the Confidence Intervals (green inner dotted lines) and the Prediction Intervals (violet outer dotted lines)

Change Acceleration Process
Venugopal R replied to Vishwadeep Khatri's question in We ask and you answer! The best answer wins.
Benchmark Six Sigma Expert View by Venugopal R Most of us are aware that GE has played a major role in popularizing Six Sigma practices and is well known for obtaining huge benefits. Having undergone my early training on Black Belt through IGE, one of the mandatory modules for the leadership team was Change Acceleration Process (CAP), which was imparted to all champions and executive leaders. The CAP broadly looks at Change as changing from ‘Current state’ to ‘Improved State’. It involves leading the change and also changing of associated systems and structures. One of the major challenges for an organization during a change is to overcome the ‘Resistance to change’. ‘Leading change’ focuses on Creating a shared need, Shaping a Vision and Mobilizing commitment. The Systems & Structures would ensure Monitoring the change, Finishing the job and Anchoring the change. The ‘WorkOut’ session is an approach taken up to accelerate the whole cycle of change management. Now, if we look at a Six Sigma project, we are trying to bring about a change, mostly on a process, which is expected to provide a sustained benefit on the efficiency, effectiveness, or both. Some of the main problems that we face in running Six Sigma projects are: Inability to provide continued attention Hindrance due to Overlapping priorities of daytoday work Non availability of key resources at a time, to take decisions on the project Delays in obtaining approvals The ‘Workouts' are highly focused, planned and dedicated sessions. The Workout consultant works closely with the Champion and the Sponsor for initial decisions about the project, designs the sessions and associated logistics. Typically the workout process will have a Design phase, Conduct phase and Implement phase Design phase: Obtain Executive sponsorship Define the critical business issues and desired outcomes Clarify Boundary conditions as applicable Select Experts across functions Define, Gather data Design work out session agenda Conduct: (usually 1 to 4 days session) A neutral third party facilitation is done for Team chartering and launch Process Analysis and Problem Solving Application of Analysis tools Decision maker’s briefing Team reportout and Onthespot decisions Team implementation and communication plan Implement: Ongoing team implementation of approved recommendations Consulting liaison between team and decision makers 30, 60 and 90 day check points with decision makers Celebration of success, capturing learning Build internal change management capability As seen above most of the activities are covered during the phases of Six Sigma DMAIC or DMADV and appropriate tools are available. Effective Workouts help in accelerating the Six Sigma project cycle 
Sisyphus Effect
Venugopal R replied to Vishwadeep Khatri's question in We ask and you answer! The best answer wins.
Benchmark Six Sigma Expert View by Venugopal R A few thoughts on addressing the Sisyphus effect… PDCA wheel analogy By looking at the story of Sisyphus, trying to roll up the rock up the hill, I can’t help relating it to the PDCA wheel which has to be rolled continuously for improvements. And that too… the PDCA wheel has to be imagined to be rolled upwards on an inclined plane. The problem that most of us would have experienced, and possibly continuing to experience is that the PDCA wheel will tend to roll backwards. We would experience it in the form of repeating the same ‘Continuous Improvement Projects’ repeatedly. The lack of adequate control systems, mistake proofing and SOPs are some of the major reasons that result in rolling back of improvements. That’s why you see that a ‘wedge’ is placed under the PDCA wheel to prevent its roll back, and this wedge is the QMS (Quality Management Systems). A good QMS is a prerequisite to ‘Continuous Improvement Programs’, the absence of which puts us at risk of losing the gains. Separating resource allocation for Continuous Improvement: Very often we see the same set of resources being given the responsibility for handling the ‘daytoday’ roles as well as ‘strategic roles’. With this, you will see that most of the ‘Improvement related actions’ get postponed due to 'preoccupation' on the daytoday activities. In order to obtain specific focus on strategic improvements and innovative thinking, specific time and resource have to be budgeted and complied with leadership focus. Comfort zone syndrome If one is used to a set pattern of activities for a long period, then they tend to develop a ‘comfort zone’ around this routine, despite it not being the most efficient method possible. There would be a resistance to come out of this routine, and to take up a creative thinking. It helps to have periodic job rotations to break the formation of such comfort zones. Continual application of Lean Develop process maps for all processes, including administrative processes and periodically perform a VA / NVA analysis. It is quite possible that you would come across few steps that could simplified, eliminated or clubbed with some other step to reduce the effort and time. With the ongoing improvements in information technology, it is important to keep identifying ways of digitizing and automating tasks that would relieve repetitive efforts by humans, and thus release their time for more creative thinking and developments. Balanced work allocation It is not uncommon to find few individuals who appear to be extremely busy and overoccupied with routine work, whereas there would be others who appear relatively less occupied. The reason could either be an imbalance in the work allocation or due to the difference in method or behavioral traits of the individuals. Apart from balancing the workload, it may be worthwhile to capture and share the best practices for performing a similar job more efficiently. 
Kaplan Meier Estimator
Venugopal R replied to Vishwadeep Khatri's question in We ask and you answer! The best answer wins.
Benchmark Six Sigma Expert View by Venugopal R The Kaplan Meier chart is used to estimate the probability of survival during a medical research. For instance, let us consider that we are interested to study the effect of a particular drug for treatment of a lifethreatening disease. The study based on 10 patients who were subjected to this treatment is plotted as below, which is knows as Kaplan Meier chart. The Y axis represents the probability of survival and the X axis represents time (say no. of years). As seen, at the start the probability of survival is taken as 1 (or 100%). After two years a patient dies, then the probability of survival drops to 0.9 (90 %). At the end of 3 years we have one more mortality, then we calculate the survival rate as the conditional probability of survival at the end of 3 years for patents who survived the first lap i.e. 0.9 * (8 / 9) = 0.8 (or 80%). The calculation for each step of this chart is continued. However, it may sometimes so happen that we might lose track of a patient. They are no longer available for the study and are categorized as ‘censored’ patients. It is represented by a vertical cross line; as seen during the 5th year. The censored patients are removed from the denominator while calculating the survival probability for that year and for subsequent years. In the above figure, the red graph represents the Kaplan Meier chart for another drug B for a similar exercise. If we look the median survival for both the groups, it will be: Median survival for Drug A = 7 years Median survival for Drug B = 4 years One can also compare the estimates of the survival probabilities for a give period. For instance: 3year survival probability for Drug A = 0.80 3year survival probability for Drug B = 0.54 In general, a steeper curve represents a worse situation. Though not discussed in detail here, it is also to be noted that there is also a confidence interval associated with each estimate, and the width of the confidence interval depends on the number of samples being studied. I hope that this brief discussion about Kaplan Meier charts provides a broad idea as to how Medical Researches would use this tool for estimating and comparing the effectiveness of treatments. 
Bootstrapping
Venugopal R replied to Vishwadeep Khatri's question in We ask and you answer! The best answer wins.
Benchmark Six Sigma Expert View by Venugopal R We normally take a sample from a large population to estimate the parameters of the population. For instance, if we are interested to estimate the average height of male population in a country, we have to rely on the findings based on a random sample. However, we also know that the finding based on one sample would not be an accurate estimate, since the average that we obtain from another sample is bound to be different. This necessitates pulling multiple samples from the large population, so that we obtain a sampling distribution from which the population parameters could be derived easily and more accurately. The task of pulling multiple samples and conducting the measurement could prove cumbersome in certain cases. Bradley Efron, an American statistician came up with a method in 1979, by which instead of taking different multiple samples, one large sample subjected to resampling with replacement could provide us with results that would be almost the same as we would have obtained by using multiple samples. He coined this method as “Bootstrap resampling”. I will try to provide a brief explanation of this method as below: One large random and representative sample set, say sample size ‘N’, has to be picked up from the population being studied. Measure each unit in the sampleset and replace them back into the sampleset Pick one unit from the sampleset, measure it for the characteristics of interest and replace it into the sampleset. Pick another unit, measure it and replace it. When you repeat this procedure N times, you would have completed one “Bootstrap sampleset”. Keep repeating point no.3 ‘K’ times to obtain data from ‘K’ Bootstrap samplesets, each containing ‘N’ samples It may be noted that since each unit is replaced before picking the next unit, there is a possibility of the same unit getting repeated within a Bootstrap sampleset Thus, it is very likely that the composition of each of the K Bootstrap samplesets would be different and hence the sample means and variances would also be different, mimicking the kind of variation that would have occurred had multiple samples been picked from the population. Advantages of using Bootstrap resampling: The need for collecting multiple samples and the associated measurement efforts are eliminated. Steps outlined above for the Bootstrap resampling method with random picking of units are best performed using computers. With Bootstrap resampling, the estimate of variance will be less biased than obtained using small samples, and thus more representative of the population. The applicability of the Central Limit Theorem, (by which the distribution of sample averages exhibit better normality properties, larger the sample size), increases with Bootstrap resampling. Some limitations of the Bootstrap resampling method: Bootstrap resampling work best with large sample sizes and the sample has to be very representative of the population. This method may not be practical in the absence of computing facilities. The practice of sample replacement would not be possible when the measurement of characteristic involves destructive methods. 
Stratified Sampling
Venugopal R replied to Vishwadeep Khatri's question in We ask and you answer! The best answer wins.
Benchmark Six Sigma Expert View by Venugopal R When there is reason to believe that a population has heterogeneity based on certain characteristics, a ‘stratified sampling’ method may be adopted rather than going for a simple random sampling. Such subgrouping of the population is based on defined characteristics and the groups are referred to as ‘strata’. Below are a few assorted situations where the stratified sampling would be useful: An opinion poll for a government decision on a population where the strata could be done based on gender, age group and location. Quality characteristic evaluation of a chemical in powder form, where the stratification may be done based on the location of the powder in the container – eg. top right, top left, bottom right, middle left and so on.. To study the productivity levels of processing of invoice data, the sampling strata could be based on grouping types of invoices – say, from different industry domains like Retail, Pharmacy, Manufacturing, Restaurant etc. For measuring the diameter of holes on a component, using multiple drilling bits, holes created by each drill bit may be taken as separate strata. For studying transit related damages for a consumer durable, the products may be stratified based on their location on the truck during transportation. While assessing the air quality in a city, it makes sense to identify different locations based on factors such as intensity of traffic and draw samples from each location. Assessing quality of a product by stratifying based on – starting of shift, middle of shift and end of shift. For analyzing reasons for overdue on Loan repayment, samples of defaulters may be taken by stratifying them based on Age, Income, type of employment, Gender, Location, Loan amount etc. The variation within each strata is expected to be smaller compared to the variation across strata. By adopting the method of stratified sampling, the overall sample size will reduce as well as more accurate conclusions can be obtained. The interpretation from the sampling results may also be used to identify whether the interested outcome has dependency on any of the strata characteristics. 
Pascal’s Triangle
Venugopal R replied to Vishwadeep Khatri's question in We ask and you answer! The best answer wins.
Benchmark Six Sigma Expert View by Venugopal R Pascal's Triangle is named after the French Mathematician Blaise Pascal. It will look as depicted below: A quick examination about the Pascal’s triangle reveals the following: The top most row (referred to as 0th row) has one number, which is 1. The next row (first row) has two numbers (or two columns) and each number is the sum of the numbers of the boxes above from the previous row. The same practice continues, and we get the Pascal’s triangle. Thus if number on the nth row and kth column is represented as then: Let us look at an example of a simple binomial probability – the outcome of tossing a coin. The following table gives the number of tosses, the outcome and the numerical representation of each outcome combination The last column of the above table is emerging as the Pascal’s triangle. It may also be seen that the binomial probabilities for a particular outcome can be worked out. For example, let’s see the probability of obtaining exactly two heads, when the coin is tossed 4 times. The total number of possible outcomes is 1+4+6+4+1 = 16. The number of combinations that gave exactly two heads is 6. Hence the probability of obtaining exactly two heads is 6 /16 = 0.375 or 37.5% 4 replies

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6 Big Losses
Venugopal R replied to Vishwadeep Khatri's question in We ask and you answer! The best answer wins.
Benchmark Six Sigma Expert View by Venugopal R Total Productive Maintenance (TPM) is a terminology introduced by Seiichi Nakajimma. As part of improving the Overall Equipment Effectiveness (OEE), the six big losses have been defined, by which it becomes easier to identify the inefficiencies. The Six Big Losses that aim to improve the OEE are: 1. Unplanned stoppages: Unanticipated stoppages of equipment for a long time. The causes for such unplanned stoppages could be Equipment breakdowns, Tool failures, unscheduled maintenance, Lack of power, Lack of raw materials or other required consumables. Since these are unexpected stoppages, we need to learn lessons from these incidents, by doing a root cause analysis and identify proactive measures to prevent recurrences or similar occurrences. A structured FMEA exercise will help identify potential causes and the associated Risk Priority Numbers. 2. Planned stoppages: Planned stoppages may happen for scheduled maintenance, Quality checks, Tool Adjustments, planned breaks, change of input materials. Since there could be multiple reasons for planned stoppage, it would be economical to sync up these activities to happen in parallel, apart from the efforts to decrease the time for the activities that consume larger duration. SMED (Single Minute Exchange of Dies) is one of the well known methods to keep the planned stoppage time low. Predictive maintenance approach is recommended. 3. Small Stoppages: Small stoppages usually happen for problems that are attended by the operator himself / herself. It could be minor cleaning of sensors, correcting minor misalignment, blockages, wrong feeding of raw material etc. Since these are mostly dealt by the operators, it is best to involve them on a Small Group Improvement program such as QC circles, to continuously and systematically identify various causes and work on solutions for each of them through employee involvement and incentive programs. A good 5S program would help to keep the work place organized. 4. Reduced speed: ‘Reduced speed’ means that the equipment is taking longer time to produce an item. Possible reasons could be wear & tear of the equipment, lubrication issues, operator skill to handle the equipment, influence by raw material or operating conditions Root cause analysis needs to be done to identify and stratify the causes. Some of the causes could point improvement in the effectiveness of the preventive maintenance schedules, that could have led to the deterioration of performance of the equipment. Issues related to Operator skills will have to be addressed by training. Enhance raw material control for associated causes. 5. Production defects: These are defective products that come out during normal production. Any output that is not ‘Firsttime right’ is considered as defective. The reasons could be due to inadequate process capability, improper setting of the machine, improper handling or defective raw materials. Incorporating strong methods for detection, control and prevention would help improve the First Pass Yield (FPY). SPC and Process Control Plans will improve control at upstream stages to prevent defective from flowing down the process. 6. Startup defects: These are defects that occur during the start of a setting. Could be due to warm up cycles, improper settings, change over process. Training using very clear standard operating procedures with validated check points, based on the historical learning would minimize the start up defects. Introducing automated methods where possible, will further reduce variation and uncertainty. 
Quantile Regression
Venugopal R replied to Vishwadeep Khatri's question in We ask and you answer! The best answer wins.
Benchmark Six Sigma Expert View by Venugopal R Linear regression fits a relationship model between the response variable and predictor variable(s) using the method of least sum of squares. The linear regression model will provide a good estimate with the assumption that the variation of the response variable across its range (i.e. at different quantiles) is fairly uniform. If this assumption is not true and the variation of the response is different across different quantiles of the response variable, then linear regression would not be the best model and one may consider using the Quantile regression. Quantile regressions are applicable when the extreme observations of the dependent variable are important and expected to vary. While Linear regression estimates the conditional mean of the dependent variable, Quantile regression estimates the conditional median (or other quantiles) of the dependent variable. Quantile regressions are more robust and not influenced by outliers as compared to the linear regression. However, the other important advantage of Quantile regression is when we are interested in the regression relationship with respect to various quantiles of the response function. Quantile regression scores over linear regression in situations where the relationship between the mean of the predictor and the response variables are weak. Below are examples of likely scenarios where Quantile regression would apply: Predictive relationships pertaining to ecology has been one of the prominent areas where Quantile regression has emerged advantageous Expenditure for a given population of people with respect a set of predictor variables, it would make sense to break the expenses into different quantiles viz. Groups with High, Medium and Low expenditures. Relationship between the quantum of sales vs input factors such as Promotional spend, demographic and other factors, it would help to identify predictors that are more significant for different quantiles of the sales volume and their corresponding relationships. ‘Close rates’ for a department stores – Effect of predictive factors on ‘High close rates’ and ‘Low close rates’ For climate related studies for eg. the factors influencing the intensity of a hurricane, Quantile regression has found application due to the varied relationship of factors for different quantiles of the hurricane intensity Corporate liquidity levels for property insurers have been found to be influenced differently by same factors are different quantiles. While the calculation for Quantile regression is more complex compared to the OLS (Ordinary Least Square) approach, with the advancements in computation technologies, application of Quantile regression is gaining more popularity 4 replies

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Fast Tracking vs Crashing
Venugopal R replied to Vishwadeep Khatri's question in We ask and you answer! The best answer wins.
Benchmark Six Sigma Expert View by Venugopal R Fast tracking and Crashing are ‘compression’ techniques used to shorten the time required to complete a project. Fast tracking is a method where activities that were planned to be performed sequentially are taken up in parallel, where possible. Crashing is method where additional resources are employed to speed up the activities and thus shorten the time required to complete the project. Let’s illustrate it using a simplified example. Image a project to set up a transaction process as per client requirements. The processes involved are Software development, Hardware procurement, Training plans, Space planning, Resource Hiring, Training. The below illustrations show the original schedule, Fast tracked schedule and Crashed schedule. For the Fast tracked schedule, the Hardware development and a portion of training plan have been taken in parallel with the Software development. Similarly, a part of the resource hiring process has been taken in parallel with the training plan and space planning. The time duration is reduced from 100 days to 65 days. For the Crashed schedule, additional resources have been added for Software development, Resource hiring and Training processes, thereby reducing the time duration for these processes, resulting in the overall schedule to reduce from 100 to 70 days. While both the above approaches save time there are certain assumptions, risks and challenges for both the approaches. For Fast tracking: The project manager is assuming that either the there is no dependency for the processes being changed from serial to parallel, or a discretionary dependency is assumed. There is a risk of doing rework and hence consuming more time if the dependency assumptions were not correct. The process(es) selected for parallel operation need to be from the critical path only. Otherwise, it will not result in saving the overall time. It is assumed that there will be no additional resource requirement while changing to parallel execution There will be need to provide effective communication to the team and associated stakeholders. For Crashing: Adding more resources will be costlier It may not be easy to onboard more resources at short notice. The skills of the newly inducted resources may not be adequate and could result in Quality issues Not all processes can be made faster by mere addition of resources. For eg. training process duration will depend on the learning ability of the trainee. Fast tracking and Crashing are compression methods, that are applied by the project manager to save the situation by altering an originally planned schedule. Hence there are risks, challenges and cost involved while applying these methods. They are likely to face resistance from other stakeholders and need to be prepared to own up responsibility in case of failures. It is very important that they effectively involve all stakeholders and apply necessary precautions, monitoring and mitigation plans if the situation requires them to adopt these methods. 8 replies

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Quality Assurance vs Quality Control
Venugopal R replied to Vishwadeep Khatri's question in We ask and you answer! The best answer wins.
Benchmark Six Sigma Expert View by Venugopal R Let us begin by looking at the dictionary meanings for 'Control' and 'Assurance' Control means – “to exercise restraint or direction over, to hold in check, curb” For example – ‘he has good control over the car even at high speeds’. Assurance means – “A positive declaration intended to give confidence; A pledge, A guarantee, surety”. For example  'The employer gave an assurance that the salary will be paid on time'. Now, how do you give an ‘Assurance’ for Quality? What would make a customer accept an assurance as a sustainable promise for Quality? How do we institutionalize the methodology for assurance as a globally acceptable practice? If we look at the evolution of Quality over past one and half century, we would see that it started with an activity to ensure that the goods passed on to customer get inspected and only the ‘acceptable’ ones are dispatched. I am not sure what the person who did this activity was called during those days, but let’s call him / her as ‘Quality inspector’. As the ‘Quality inspector’ kept doing his / her job, the folks who produced the goods started involving with him / her over a period of time and started working on ways to improve the acceptance rate of the product. Though this helped in bringing some improvements, may limitations being faced by the people performing production started surfacing – viz. Design limitations, Process limitations, Resource related issues, Budget constraints, Raw material issues and so on. Naturally, the immediate and initial reactions are to put in curbs or controls to avoid passing on defects to the next stage. Such 'Quality Controls' included stagewise inspections, adjustment of process / equipment settings based on feedback, identifying process parameters that are found to influence product quality and monitoring them – all these necessitated employees of different functions to collaborate and exercise various levels of ‘controls’ for maintaining Quality. If you read the book on ‘Quality Planning and Analysis’ by Dr. Joseph Juran and Frank Gryna, which was popular from the 1980's onward, you will see how they have expanded the process of Quality Planning as a ‘Company wide’ movement. Juran has also referred Quality as “small q” and the “Big Q”. The “Big Q” defined Quality beyond the boundaries of ‘Product & Processes’ and led to encompassing all functions of the organization. He has been one of the first experts to realize that by mere inspection and control measures, we cannot provide an assurance on a sustained Quality output from an organization. His work has been an enlightenment towards understanding the concept of ‘Quality Assurance’ Some of the topics as part of his reference to companywide Quality, that built a framework for Quality Assurance include: 1. Quality Costs, 2. Strategic Quality Management, 3. Corporate Quality culture, 4. Customer needs understanding, 5. Designing for Quality, 6. Supply Chain Quality, 7. Manufacturing Quality, 8. Process Audits, 9. Conformance to specifications and fitness for use, 10. Sampling plans, 11. Quality Assurance audits and reporting, 12. Application of Statistical techniques for analysing, controlling and designing for Quality Soon, during the late 1980's, the concept of an international Quality Management System (QMS) emerged in the form of ISO 9000 series of standards for Quality and stormed the world. Many customers consider such QMS certifications as a substantiation for Quality Assurance. Holding on to the concept of ‘BigQ’, the movement further progressed into extending and combining the use of Quality Management tools and methodologies for the overall prospering of the business, giving rise to Business Excellence Models. Thus, Quality Control and Quality Assurance can be seen as stages in the Quality Continuum. It may also be noted each stage of the continuum would continue to uphold the good practices of the earlier stage. Thus, certain extent of good inspection practices will be part of Quality Control. Quality Control practices will be included in the Quality Assurance System. Quality Assurance systems would be incorporated within any good Business Excellence program. 
Stop The Line
Venugopal R replied to Vishwadeep Khatri's question in We ask and you answer! The best answer wins.
Benchmark Six Sigma Expert View by Venugopal R “StopTheLine” is a tough situation. On one side any organization wants to ensure that Product Quality is not compromised. On the other side, there are delivery targets for the day, for which the Operations become answerable. Again, if the line is stopped, it causes idleness for the workers who get an unexpected respite from their routine and the supervisors have to manage the work force who may get scattered once the line stops. Getting them back and regaining the rhythm is another concern. Altogether, it is certainly not an enviable situation for anyone. Even when Taiichi Ohno brought in the system for ‘stoptheline’ in Toyota, he had many opponents within the organization. The ‘Andon cord’ was a popular system where any worker at any level had the right to pull the ‘cord’ which will result in stoppage of production. Then the concerned staff and the workers will discuss on resolving the issue as quickly as possible and restore the production line. Many organizations do claim that they will practice the system and even empower certain employees to stop the production based on the observing an issue. However there is bound to be many questions that the person who stops the line has to face. Some of them are: We could have continued the production and fixed it without stopping. This problem doesn’t appear serious enough to have stopped the production. Why did you wait till this problem reached the production line and not discover it earlier? Who approved the process? Why are you not questioning him / her instead of stopping the line? You will be held responsible for the loss of production, because you stopped the line. Since you stopped the line, you are responsible to fix it and start the line. We could have completed today’s ‘numbers’ and then fixed the issue as retrofitment in the finished product warehouse. This is how we have been producing all along. Why are you waking up today and stopping the line? As seen, it is one of the common causes for the shop floor ‘disputes’ between Quality and Operations. I will share some approaches below, that have helped to help take rational decisions on line stoppages. Firstly, there has to be clear unified commitment from the leadership team, in the event of such situations, which are bound to happen some time or other A very good QMS is important to ensure that adequate systems and controls exist on supplied parts, first part approvals, equipment calibrations, change management, design controls for product and processes and so on. We do not want to empower linestoppage and keep facing it every day! It should only occur as a rare situation. Well documented procedure explaining the circumstances when a ‘stoptheline’ decision may be taken Procedure will cover who could take such as decision. Care needs to be taken to ensure that the coverage is reasonably adequate to prevent dependency on just one or few individuals who may not be available during such an emergency situation. The procedure should also include the reaction and restoration plans. Sometimes, it would involve pulling back finished goods and retesting / reworking them “Shooting the messenger” attitude should be discouraged, and focus should be on quick and effective restoration. While every effort needs to be taken to prevent ‘falsealarms’, a rare incident of falsealarm needs to be taken in the right spirit. It is better to be safe than sorry! The management should be relieved that someone has been able to point out the defect. Though it resulted in ‘linestoppage’, it is a situation better than a ‘Product recall’. Every ‘linestoppage’ situation has to be taken as an incident of hard learning and should be included into the directory for preventive actions. 10 replies

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Nash Equilibrium
Venugopal R replied to Vishwadeep Khatri's question in We ask and you answer! The best answer wins.
Benchmark Six Sigma Expert View by Venugopal R 'Game Theory' relates to study by theoretical framework and mathematical models to comprehend social situation among competing players and provide optimal decision making. In Game theory, Nash Equilibrium refers to a state of decisioning, among two or more players, in which each player understands the ‘equilibrium strategy’ of other players and no player can gain anything by changing their strategies. The idea has been illustrated in most literature on this topic using a popular example on ‘Prisoner’s dilemma’. To see the application of Nash Equilibrium in a business scenario, we may consider two competing companies A and B, trying to fix their pricing strategies for a competing product. However, a relatively higher pricing can pull down the sales and in turn the overall profits for the companies. Let us assume that the strategy of one player is known to the other player. The different scenarios could be as follows: 1. Player A fixes High price and Player B also fixes High price 2. Player A fixes High price and Player B fixes Low price 3. Player A fixes Low Price and Player B fixes High price 4. Player A fixes Low Price and Player B also fixes Low price The scenarios are represented in the table as below. Let us fix a numerical index of profitability, that is shown inside the cells of the table. The first number represents the profitability index for Player A, and the second one represents the same for Player B. The profitability index is influenced by price and volume. However, a higher price would pull down the volumes thus reducing the overall profitability. Thus from the above table it appears that at lower price has led to improvement of overall volumes from both the players resulting in best profitability index for both. As we can see for scenario 1, both the players have equal profitability index. However, Player A would be tempted to move to scenario 3 to increase its index. Similarly, Player B might shift to scenario 3 to improve its index. Also, in the scenarios 2 and 3, there is a possibility for players A and B respectively to attempt improvement to improve their competitiveness with respect to profitability index. However, in scenario 4, neither of the players will see a benefit in changing their strategies with respect to their competitor’s strategy and hence we can expect the best stability. This state represented by scenario 4 in this example denotes the Nash Equilibrium. In this state, there is a ‘WinWin’ situation for both the players as well as for the consumers! We may think of another business situation where the players could be the Marketing department and the Product development department. While the Product development’s strategy is to include more innovative features into a newly developed product, the Marketing’s strategy is to time the launch of the product to beat the competition. We can build a scenario to study the effect on the ‘Market success’ of the product and the factors would be the level of innovative features and the time duration for launch. There could be a state of Nash equilibrium, where both the players may not want to alter their strategies, after knowing the other’s strategy. At the Nash Equilibrium state, the Marketing would not want to squeeze the dates any further since, the product competitiveness may be affected. The Product Development would put a freeze on the features to abide by the launch dates, otherwise there is a risk of their future funds getting impacted due to potential loss of revenue opportunity. Again the Nash Equilibrium will get them settle for a WinWin situation! The above examples have considered only 2 players for simplicity, whereas there could be more in real life scenarios. 
Use of Median for Performance Assessment
Venugopal R replied to Vishwadeep Khatri's question in We ask and you answer! The best answer wins.
Benchmark Six Sigma Expert View by Venugopal R Using median as a measure of central tendency helps to avoid effect of outliers. For those who need a clarity on fundamental behavior of mean and median, the following simple example will help. Consider as set of nine data points representing the minimum time in days between failures for nine similar equipment. 70, 248, 2400, 240, 2, 1460, 230, 180, 440 The mean for the above data is 586 whereas the median is 240. Now consider the data set below, which is same as above except that the maximum value has further increased from 2400 to 4800 70, 248, 4800, 240, 2, 1460, 230, 180, 440 The mean has shot up to 852, whereas the median remains unaffected at 240. In the above situation, the median is a more realistic representation as a measure of central tendency of the data. Few examples where the median may be a better choice: 1. Income data in an organization: It is quite possible that there could be a few high paid individuals, by which the mean could be severely biased, hence median is preferable. 2. Age of employees in a society: A few very senior citizens among a majority of people being in the lower middle age band, could give a nonnormal distribution. 3. Customer satisfaction surveys using a Likert scale of 1 to 10: A very few customers voting on the upper or lower extreme could distort the reality – hence usage of median helps. 4. Life expectancy based on a specialized treatment: For instance if most patients had a post treatment life span in the range of 10 to 15, one odd patient living for 45 years could provide an unrealistic expectancy, unless we use median as a measure of performance. 5. The comparative tests performed on nonnormal distributions, knows as nonparametric tests are based on usage of median. Examples of such tests are 1Sample sign, Wilcoxon Signed rank, Mann Whitney, Kruskal Wallis, Moods Median.