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Six Sigma - DMAIC Methodology

  • Swetha Y
  • Aug 1, 2019
  • 0 comment(s)

What is Six Sigma?

Six Sigma is a quality-control methodology developed in 1986 by Motorola, Inc. The method uses a data-driven review to limit mistakes or defects in and process. Six Sigma emphasizes cycle-time improvement while at the same time reducing manufacturing defects to a level of no more than 3.4 occurrences per million units or events. In other words, the system is a method to work faster with fewer mistakes.

Six Sigma focuses on the way that, numerically, it would take a six-standard-deviation occasion from the mean for a mistake to occur. Since just 3.4 out of a million arbitrarily (and ordinarily) conveyed, occasions along a ringer bend would fall outside of six-standard-deviations (where sigma remains in for "standard deviation").

Six Sigma is a system to use to improve business forms by using the factual investigation as opposed to the mystery. This demonstrated methodology has been executed inside a heap of ventures to accomplish hard and delicate cash investment funds while expanding consumer loyalty. is at the front line of Six Sigma accreditation and counselling administrations.


A Business Strategy: Using Six Sigma Methodology, a business can strategize its strategy and drive income increment, cost decrease and procedure upgrades in all pieces of the association.

A Vision: Six Sigma Methodology helps the Senior Management create a vision to provide a defect-free, positive environment to the organization.

A Benchmark: Six Sigma Methodology helps in improving process metrics. When the improved procedure measurements accomplish solidness; we can utilize Six Sigma technique again to improve the recently settled procedure measurements. For instance, The Cycle Time of Pizza Delivery is improved from an hour to 45 minutes in a Pizza Delivery process by utilizing Six Sigma strategy. When the Pizza Delivery procedure balances out at 45 minutes, we could complete another Six Sigma venture to improve its process duration from 45 minutes to 30 minutes. Therefore, it is a benchmark.

A Goal: Using Six Sigma methodology, associations can keep a stringent objective for themselves and work towards accomplishing them over the span of the year. The correct utilization of the system regularly drives these associations to accomplish these objectives.

A Statistical Measure: Six Sigma is a data-driven methodology. Factual Analysis is utilized to distinguish the main drivers of the issue. Moreover, Six Sigma system figures the procedure execution utilizing its very own unit known as Sigma unit. 

A Robust Methodology: Six Sigma is the only methodology available in the market today which is a documented methodology for problem-solving.Whenever utilized in the correct way, Six Sigma upgrades are shot evidence and they give high yielding returns.


Six Sigma Model (DMAIC Model)

Six Sigma pursues the DMAIC model for quality improvement and issue decrease (For existing procedures). This well-characterized procedure approach comprises of five stages all together:


What problem would you like to fix? The Define Phase is the first phase of the Lean Six Sigma improvement process. In this phase, the project team creates a Project Charter, a high-level map of the process and begins to understand the needs of the customers of the process. This is a critical phase in which the team outlines the project focus for themselves and the leadership of the organization


The main objective of this phase is to collect the data that is relevant to the scope of the project. This phase focuses on identifying the parameters that need to be quantified, ways to measure them, collect necessary data and carry out measurement by different techniques.

The operational meaning of metric is conceived. It gives basic language and comprehension of information being gathered. Does information Collection plan plot what information to be gathered? When to be gathered? Who will gather? Subsequently, sets generally speaking heading for information accumulation.

After information gathering, information is examined to determine its inclination through recurrence disseminations. The histogram can be utilized to comprehend the conveyance of information. Contingent on information nature – Normal or Non – Normal, information - examination devices are chosen. Current Process capacity is additionally a significant perspective to be comprehended in this stage.

In Measure stage, various devices can be utilized like Process flowcharts, Benchmarking, Run graphs, Gage R and R and Processability.

Two usually utilized estimation strategies are – Defects Per Million Opportunities (DPMO) and Process Sigma.


The main objective of this phase is to find the root cause of business inefficiency. It identifies the gaps between actual and goal performance, determine its causes and opportunities for its improvement.

 Analyze phase follows a drill-down approach to reach exact root causes from various potential causes identified initially.  

This stage begins with investigating every single imaginable reason to the primary issue. At that point, these causes are checked and approved however theory and factual devices. The result of this stage is confirmed underlying drivers – which should be followed up on to improve the procedure. Break downstage requires due consideration to distinguish and check the main drivers. Since the viability of procedure improvement through six sigma venture lies on the right recognizable proof of underlying drivers.

Commonly used tools in Analyze phase are Fishbone Diagram, Brainstorming, Histogram, 5 Whys, Hypothesis testing, Time series plots and Scatterplot.


This phase improves the process by determining potential solutions, ways to implement them, test and implement them for improvement. In this phase, process owners are consulted and improvements are suggested. Activity plan for the improvement is coursed to important partners. This activity plan indicates – Action to be taken; By when By whom and so forth. The improvement plan is intended to relieve the hazard and incorporate client input and fulfilment. With the arrangement

of progress activity plan, usage stage begins at the same time. During execution, activities are done, tried for adequacy and actualized at long last.




The main objective of this phase is to generate a detailed solution monitoring plan. This plan ensures that the required performance is maintained. Activity plan for the improvement is coursed to important partners. This activity plan indicates – Action to be taken; By when By whom and so forth. The improvement plan is intended to relieve the hazard and incorporate client input and fulfilment. With the arrangement of progress activity plan, usage stage begins at the same time. During execution, activities are done, tried for adequacy and actualized at long last.


Final Takeaway


Six Sigma DMAIC methodology has been internationally accepted and can be implemented in small-size to high-profile firms. Six Sigma is a highly structured & logical methodology.


The structure finished passes five significant stages – DMAIC. The yield from one stage is treated as a contribution to the following stage. What's more, at last, results are acquired according to desires. All these five stages characterize, measure, break down, improve and control – structure a roundabout chain of ceaseless improvement. Six Sigma is a mission – a voyage for development doesn't finish by achieving one achievement. This procedure improvement device can be utilized ceaselessly to acknowledge constant improvement. Thus, prompting magnificence.


What is DMADV?

DMADV is a Six Sigma framework that focuses primarily on the development of a new service, item or procedure instead of improving a formerly existing one. This methodology – Define, Measure, Analyze, Design, Verify – is particularly helpful when executing new systems and

activities in light of its premise in information, early recognizable proof of achievement and exhaustive examination.



The goals of the first phase are to identify the purpose of the project , process or service, to recognize and after that set practical and quantifiable objectives as observed from the viewpoints of the association and the stakeholder(s), to make the timetable and rules for the survey and to distinguish and evaluate potential dangers. An unmistakable meaning of the task is set up during this progression, and each methodology and objective must be lined up with the desires for the organization and the clients.



Next comes measuring the factors that are critical to quality, or CTQs. Steps taken should include: characterizing prerequisites and market fragments, recognizing the basic structure parameters, planning scorecards that will assess the plan segments increasingly imperative to the quality, reassessing hazard and surveying the creation procedure capacity and item ability. When the qualities for these variables are known, at that point a compelling methodology can be taken to begin the generation procedure. It is significant here to figure out which measurements are basic to the partner and to make an interpretation of the client prerequisites into clear task objectives.




Actions taken during this phase will include: developing design alternatives, identifying the optimal combination of requirements to achieve value within constraints, creating reasonable structures, assessing then choosing the best parts, at that point building up the most ideal plan. It is during this phase a gauge of the all out life-cycle cost of the plan is resolved. After completely investigating the distinctive plan options, what is the best structure alternative accessible for gathering the objectives?




This stage of DMADV includes both a detailed and high-level design for the selected alternative. The components of the structure are organized and from that point, an abnormal state configuration is created. When this progression is finished, a progressive point by point model will be prototyped so as to recognize where mistakes may happen and to make vital changes


In the last stage, the group approves that the structure is satisfactory to all partners. Will the structure be compelling in reality? A few pilot and generation runs will be important to guarantee that quality is the most elevated conceivable. Here, desires will be affirmed, sending will be extended and all exercises educated will be archived. The Verify step additionally incorporates an arrangement to progress the item or administration to a standard activity and to guarantee that this change is reasonable.

For any DMADV venture, there might be more accentuation on specific segments of the methodology over others, however, the objective continues as before: to address a distinguished issue and produce wanted outcomes in a manner that can be kept up through typical tasks.




DMADV (DFSS) represents these five periods of a Lean Six Sigma venture that is gone for making another item or procedure plan:


D — Define procedure and plan objectives


M — Measure (and distinguish) basic top-quality parts of your procedure/item, including dangers and creation abilities


A — Analyze to create procedure plans and assess to choose the best structure for your procedure


D — Design procedure subtleties and advance your structure. Test your design(s)


V — Verify the picked plan for your procedure with pilot-testing. Execute and screen the new procedure


DMAIC is the more outstanding and most-utilized Lean Six Sigma venture system and is centred around improving a current procedure, as opposed to making another item or procedure like DMADV.


D — Define the issue with your item or procedure.


M — Measure your present procedure and gather information.


A — Analyze your information to discover the main drivers of imperfections.


I — Improve your procedure depending on your information examination and test it. (Strategies like DOE and poka burden are regularly utilized in this stage.)


C — Control your new procedure and screen for imperfections. (SPC procedures are useful in this stage.)



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