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Lean Six Sigma: Your Comprehensive Guide

id you know that approximately 12% of an organisation's resources are wasted due to unproductive project management? In addition, recent statistics show that 55% of interviewed project managers state that overspending is the main reason for project failure.

Organisations and businesses use Lean Six Sigma to eliminate waste and unproductive practices. This powerful project management methodology has brought success to companies. If you're a project manager or a beginner who wants to start a career in project management, learning Lean Six Sigma is a great step for your career success.

In this guide, we will explore the definition, history, principles, and practical applications of Lean Six Sigma and its importance in the business world.

Lean Six Sigma Definition

Lean Six Sigma Definition

Lean is a strategy businesses use to improve processes by cutting out unnecessary steps and waste. Lean's main ideas involve eliminating waste, improving efficiency, and creating a culture of continuous improvement. 

On the other hand, Six Sigma aims to improve processes by reducing variations and defects to improve overall quality. This methodology uses statistics to determine problems in business processes. By analysing data, organisations can find the root cause of the problem and formulate solutions. Using the DMAIC methodology, the aim is to reach a level of performance where the chance of defects is very low.

Lean Six Sigma combines Lean and Six Sigma principles into a comprehensive strategy for business improvement. It combines Lean's focus on reducing waste and improving efficiency with Six Sigma's goal of cutting defects and boosting quality. Simply put, Lean Six Sigma improves business processes by eliminating waste and reducing errors. 

History of Lean Six Sigma

The history of Lean Six Sigma traces back to the independent development of Lean and Six Sigma methodologies. Lean, originating from Toyota's manufacturing practices in the 1930s, aimed at minimising waste (non-value-adding activities) and improving efficiency.

Six Sigma emerged at Motorola in the 1980s, focusing on reducing defects. The integration of these methodologies gained traction in the late 1990s, officially termed "Lean Six Sigma" in 2001. This integrated approach found widespread use across industries, proving effective for achieving operational excellence, cutting costs, and enhancing customer satisfaction.

Why is Lean Six Sigma Important?

Why is Lean Six Sigma Important

Lean Six Sigma helps organisations operate smoother, with fewer mistakes, and maximises efficiency. Here are other key benefits of using Lean Six Sigma methodology:

  • Data-Driven Decision-Making:Lean Six Sigma uses data and statistical analysis to make informed and objective decisions.

  • Employee Engagement:The methodology fosters a culture of continuous improvement, encouraging employees to identify and implement process enhancements actively.

  • Improved Lead Times:The focus is reducing cycle times, which means quicker response to customer demands and improved delivery timelines.

  • Increased Productivity:By eliminating non-value-added activities and optimising workflows, Lean Six Sigma increases productivity and output.

  • Competitive Advantage:It helps organisations gain a competitive edge by delivering higher quality products or services more efficiently than competitors.

  • Flexibility and Adaptability:Lean Six Sigma's focus on continuous improvement fosters organisational adaptability, allowing businesses to respond effectively to changes in the market or industry.

  • Standardisation:The methodology encourages standardised processes and promotes consistency while reducing operation variations.

  • Increased profit:Lean Six Sigma can help increase profits by improving processes and reducing waste.

More than Lean Six Sigma's obvious benefits on the outputs, this method introduces change to the organisational culture. Employees, leaders and managers adopt the mindset of growth and continuous improvement. This change allows the organisation to maximise quality, efficiency and profitability.

Lean Six Sigma Principles

Lean Six Sigma Principles

Lean Six Sigma principles are rooted in a set of guiding concepts that form the foundation of the methodology. Some key principles in the Lean Six Sigma method include:

  • Customer Focus:Prioritise customer needs and expectations to deliver products and services that meet customer requirements.

  • Continuous Improvement:Embrace a culture of continuous improvement, encouraging teams to seek and implement incremental changes for enhanced efficiency.

  • Data-Driven Decision-Making:Rely on data and statistical analysis to make informed decisions, ensuring a systematic and objective approach to problem-solving

  • Waste Elimination:Identify and eliminate various forms of waste, including overproduction, defects, waiting times, motion, inventory, transportation, excess processes and non-utilised talent.

  • Process Streamlining:Streamline processes to reduce complexity and enhance flow, resulting in a smoother and more efficient workflow.

  • Variation Reduction:Six Sigma tools minimise process variations, increasing consistency and quality in the final output.

Lean Six Sigma Phases

Lean Six Sigma Phases

The Lean Six Sigma methodology follows a structured approach with distinct phases, often called DMAIC (Define, Measure, Analyse, Improve, Control). These phases guide practitioners through identifying opportunities for improvement, collecting and analysing data, implementing solutions, and sustaining improvements. The phases are:

  • Define: During the Define phase, the project's goals, scope, and objectives are clearly outlined. This involves understanding customer requirements, defining the problem, and establishing measurable project goals.

  • Measure:The team then assesses and quantifies the process's current state. Data is collected to grasp how the process is performing, identify potential areas of variation, and set baseline metrics. This phase lays the groundwork for making informed decisions.

  • Analyse:Data is analysed to identify the root causes of problems and variations in the process. Statistical tools and techniques are applied to gain insights into the factors influencing performance. The goal is to pinpoint areas for improvement.

  • Improve:In this phase, solutions are developed and implemented to address the identified issues. Lean principles, such as reducing waste and optimising flow, are integrated with Six Sigma techniques for defect reduction. Changes are carefully tested, and improvements are monitored.

  • Control:The Control phase is about ensuring that the improvements made are sustained. Measures and monitoring systems are established to guarantee that the process remains stable and continues to meet the defined goals. Standardisation and ongoing measurement are crucial in this phase.

Examples of Lean Six Sigma

Lean Six Sigma finds application across various industries, showcasing its versatility and effectiveness. Some notable examples include:

  • Manufacturing:Lean Six Sigma has roots in manufacturing, where it initially gained prominence. Companies like Toyota and General Electric successfully implemented Lean Six Sigma to enhance production efficiency and product quality.

  • Healthcare: In healthcare, Lean Six Sigma is utilised to optimise processes, reduce patient wait times, minimise errors, and enhance overall patient care.

  • Finance: Financial institutions use Lean Six Sigma to streamline processes related to transactions, customer service, and risk management, leading to improved accuracy and efficiency.

  • Service Sector:Organisations in the service sector, such as airlines and hospitality, apply Lean Six Sigma to enhance customer experiences, reduce delays, and improve service delivery.

  • Information Technology:IT companies leverage Lean Six Sigma to improve software development processes, reduce defects, and enhance the speed of product delivery.

Belt Levels and Lean Six Sigma Certifications

Belt Levels and Lean Six Sigma Certifications

Lean Six Sigma training and certification are necessary for anyone who wants to achieve a promotion and earn a higher salary. Before going into the certifications, you must understand the different belts (levels) of Lean Six Sigma with the corresponding Lean Six Sigma courses we offer here at e-Careers.

These belts or levels require varying degrees of expertise, knowledge and proficiency in Lean Six Sigma methodologies.

Yellow Belt

The Yellow Belt certification in Lean Six Sigma provides a foundational grasp of principles and methodologies without specific prerequisites. This entry-level course caters to beginners aiming to support projects led by Green or Black Belts. 

It is ideal for those new to Lean Six Sigma or seeking a basic understanding without taking on extensive project management responsibilities. We offer this course online and through our virtual classrooms.

Green Belt

The Green Belt certification is suitable for a deeper understanding of Lean Six Sigma and the ability to lead improvement projects. This level builds upon Yellow Belt concepts.

Green Belts, which works closely with Black Belts, manages specific project aspects. Prerequisites typically include a basic understanding of Lean Six Sigma.

This certification will suit you if you aspire to lead or actively contribute to process improvement projects. Expert project management professionals teach our CEPAS-accredited Lean Six Sigma Green Belt through online and virtual classrooms.

Black Belt

The Black Belt certification indicates a strong grasp of Lean Six Sigma principles and the skill to guide and carry out projects. A certified Lean Six Sigma Black Belt is an experienced professional trained in advanced methodologies and tools. They are tasked with leading complex improvement projects throughout the organisation and play a crucial role in training and mentoring Yellow and Green Belts.

Black Belts play a strategic role in organisational change. Prerequisites usually include Green Belt certification and project leadership experience.

This level suits experienced professionals, project managers, or leaders who drive significant process improvements. Training is delivered via eLearning and virtual classrooms.

Master Black Belt

The Master Black Belt certification represents the highest expertise level in Lean Six Sigma. Master Black Belts mentor and coach Black Belts and Green Belts.

Prerequisites include extensive Black Belt experience, often with multiple project completions. Tailored for seasoned professionals, this level is for those showcasing leadership in Lean Six Sigma.

Get Your Lean Six Sigma Training with e-Careers

Get Your Lean Six Sigma Training with e-Careers

Selecting the right Lean Six Sigma certification depends on your experience, career goals, and involvement in Lean Six Sigma projects. If you want the best training with the best experts in the industry, choose e-Careers.

We are one of UK's top training providers for project management. With over 10 years of experience, our expert professionals have already trained 625,000 delegates globally. Furthermore, our Lean Six Sigma courses are accredited by CEPAS and meet the global ISO 18404 standard. This means that our certifications give double assurance that you get the best quality training that will be significant even for years to come.

Here at e-Careers, we help you leverage your career and get your desired job. Contact us today. through phone (+44 (0) 20 3198 7700) or email ( ask@e-careers.com ).


Q. What's the cost of getting a certification in Lean Six Sigma?

Lean Six Sigma certification costs vary based on the level (Yellow Belt, Green Belt, Black Belt, or Master Black Belt) and the certifying body. Costs may include training fees, exam fees, and study materials.

Q. What are the certifications and training for Lean Six Sigma?

Common Lean Six Sigma certifications include Lean Six Sigma Yellow Belt, Lean Six Sigma Green Belt, Lean Six Sigma Black Belt, and Lean Six Sigma Master Black Belt. e-Careers offers all certifications from Yellow Belt to Black Belt.

Q. What jobs can you qualify for if you get a Lean Six Sigma qualification?

With a Lean Six Sigma qualification, you can qualify for various roles, including Process Improvement Specialist, Quality Manager, Project Manager, Operations Manager, and different leadership positions focused on efficiency and quality enhancement.

Q. What's the difference between Lean, Lean Six Sigma and Six Sigma?

Lean focuses on waste reduction and process efficiency. Six Sigma concentrates on reducing defects and process variations. Lean Six Sigma combines both methodologies, providing a comprehensive approach to achieve efficiency and quality improvements in processes.

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