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Lean vs Six Sigma: Understanding the Lean Six Sigma Methodology

Quality Management Methodologies

Organizations are constantly trying to add value to their business processes and improve the “quality” of their product and services. This mindset has made quality management indispensable in every industry across the globe.

Both Lean and Six Sigma are well-known quality management methodologies that help organizations deliver quality products and services to their customers. The main objective of both methodologies being value addition.

Lean Vs Six Sigma – Even though the two disciplines serve the same purpose, there is a difference between lean and six sigma they differ in their approaches to achieve their objective. It is very important to understand the essential difference between Lean and Six Sigma. This will in turn help in understanding the concept of Lean Six Sigma, which combines Lean and Six Sigma to form a powerful methodology.

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Lean Vs Six Sigma

Overview of Lean

The Lean methodology focuses on the elimination of wastes. It helps in improving the business process by reducing wasteful processes that do not add value to the end products or services. This concept was first introduced in the manufacturing industry where it proved effective in increasing business efficiency. Slowly the methodology was introduced in other industrial sectors as well.

Lean defines wastes as anything that affects the end result and does not meet the customer’s requirement. These wastes can be either eliminated or reduced to improve the overall productivity of the business. There are 8 types of wastes in the Lean methodology, they are:

  • Defects – These are products or services that do not meet the standards set by the organization and its customers.
  • Overproduction – Sometimes more products or services are created unnecessarily that adds to the overall costs.
  • Transportation – Shipping or transportation of products also adds to the budget.
  • Over Processing – Some products are subjected to more processing than needed.
  • Waiting time – This is the time taken during several processes in the organizations. 
  • Inventory – This includes a surplus of raw materials or finished products.
  • Motion – Movement of resources or products without any reason.
  • Non-Utilized Talent – Not using the human resources effectively or assigning the wrong person to a particular task is also a waste.

The main purpose of the Lean methodology is to maximize business efficiency by eliminating or reducing wasteful processes. This results in delivering quality products and services to the customers. Ultimately the customers pay for products or services that satisfy their requirements without any additional costs. Thus, helping organizations increase their productivity and profits.

Introduction to Six Sigma

Six Sigma emphasizes reducing the variation in business processes through statistical analysis. This helps in controlling the process and eliminates the chances for defects. It is a data-driven approach to meet the customers’ requirements. The goal of the Six Sigma methodology is to improve the efficiency of the business process and deliver quality products to the customers.

The methodology of Six Sigma uses the DMAIC method to reduce variation and improve the entire business process. The DMAIC method stands for define, measure, analyze, improve, and control. The 5 phases form an important part of the Six Sigma discipline and find their uses in the Lean methodology as well. They are discussed in detail below:

  • Define – Here the aim is to define the problem in the process, project, and customer requirements.
  • Measure – In this phase, the performance of the process is measured against the process requirements.
  • Analyze – After measuring the current state of the process, the problem or defect is analyzed.
  • Improve – This phase focuses on improving the process by reducing or eliminating the root causes that are affecting them.
  • Control – The last step in the DMAIC method focuses on maintaining the improvement procedure at its present state.

The Six Sigma methodology of process improvement values customer satisfaction. When the customers get what they want, revenue increases for the organization. Thereby leading to an increase in the overall productivity, i.e. six sigma can transform business productivity as well. Like Lean, the concept of Six Sigma became popular in the manufacturing industries. However, it expanded to other industries and found its application in all aspects of a business process.

Lean vs Six Sigma

The two-process improvement methodologies of Lean and Six Sigma help organizations to achieve the desired goals. Even though their approaches may be different, they serve the same objective. Lean and Six Sigma are often confused to mean the same. Lean vs six sigma means they are two separate methods that can be used complementarily for process improvement. This leads to the merging of the two disciplines of process and quality management to become Lean Six Sigma.

Therefore, to summarize the main difference of Lean vs six sigma is that the Lean methodology focuses on waste reduction or elimination, while the methodology of Six Sigma emphasizes producing consistent results.

However, both quality management methodologies have the same objective, which is process improvement and thereby meeting customers’ requirements.

Importance of Lean Six Sigma

The goal of any business enterprise is to maximize its processes to attain the desired results. Both Lean and Six Sigma can serve the purpose effectively. Lean six sigma help organizations to streamline their business processes and add value to the end-products or services. Since both methodologies have their own benefits, merging and using both methodologies is a better approach and has better chances for producing the optimum output.

Lean Six Sigma has been used in organizations across major industries like manufacturing, packaging, supply chain, healthcare, pharmaceuticals, engineering, IT, finance, and many more. Organizations rely on qualified and experienced professionals who have an in-depth understanding of Lean Six Sigma and its various tools and techniques. These professionals can help them attain the business objectives by successfully implementing Lean thinking and Six Sigma principles.

Unichrone offers Lean Six Sigma Certification Courses to individuals who want to work in the process improvement and quality management sector. The training and certification courses in Lean Six Sigma Yellow Belt, Lean Six Sigma Green Belt, and Lean Six Sigma Black Belt provided are recognized across the industry. Successfully completing and earning the certifications will help professionals become respected quality improvement experts in the industry.


In the end, we can conclude that both Lean and Six Sigma are very important for improving business efficiency and increasing productivity. There is no competition between either methodology. They serve the same purpose and have different approaches to attain the purpose. Organizations implementing the two disciplines as – the Lean Six Sigma methodology, produce effective results and will have better success rates. Also, individuals who aspire to become process improvement specialists of their organizations will benefit a lot by understanding the methodology of Lean Six Sigma in detail.  

Posted in Quality Management

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