Lean Six Sigma is a structured methodology that uses data-driven techniques to eliminate waste and reduce variation in processes, ultimately improving overall performance. One of the distinctive features of Lean Six Sigma is the belt system, which categorises practitioners based on their expertise, training, and responsibilities. In this blog post, we will explore the different levels of Lean Six Sigma belts, their areas of responsibility, knowledge, focus, and involvement, as well as the various types of improvement projects that organisations might undertake.

The Lean Six Sigma Belt System

The Lean Six Sigma belt system is analogous to the ranking system in martial arts, with each belt level representing a different degree of proficiency and responsibility within the methodology. The primary belt levels include White Belt, Yellow Belt, Green Belt, Black Belt, and Master Black Belt.

White Belt

White Belts are typically involved in understanding basic Lean Six Sigma concepts and participating in local problem-solving teams. They have a foundational knowledge of Lean Six Sigma principles and terminology. Their focus is on learning the basics of Lean Six Sigma and how it applies to their specific roles, supporting larger projects by providing local knowledge and assistance as needed.

Yellow Belt

Yellow Belts contribute to project teams by gathering data, participating in problem-solving, and supporting Green Belts and Black Belts. They have a deeper understanding of Lean Six Sigma concepts, tools, and methodologies. Yellow Belts may participate as team members in Green Belt or Black Belt projects or may lead small everyday improvement activities within their local work area. They focus on understanding process improvement techniques and tools such as cause-and-effect diagrams and Pareto charts, actively participating in Lean Six Sigma projects and supporting the implementation of improvements.

Green Belt

Green Belts lead smaller-scale projects or assist Black Belts with larger projects. They are responsible for data collection, analysis, and implementing process improvements. Green Belts handle small to medium projects within a localised area and are typically mentored by a coach who provides guidance as the project progresses through each phase of DMAIC. They are expected to spend 20-to-25% of their time on improvement projects. They have comprehensive knowledge of Lean Six Sigma tools, including DMAIC (Define, Measure, Analyse, Improve, Control) methodology and basic statistical analysis. Green Belts focus on leading process improvement projects and applying Lean Six Sigma tools to solve specific problems, leading or supporting projects, conducting data analysis, and driving process improvements.

Black Belt

Black Belts lead larger and more complex projects. They mentor and train Green Belts and Yellow Belts. They are responsible for project management, data analysis, and delivering measurable improvements. Black Belts can function within any part of the business and across multiple functions, leading projects capable of delivering benefits in around six months, working full time. They have advanced knowledge of Lean Six Sigma methodologies, including complex statistical tools and change management techniques. Black Belts focus on leading high-impact projects, managing teams, and ensuring project alignment with organisational goals. They are involved in overseeing multiple projects, training and mentoring other belts, and driving significant process changes.

Master Black Belt

Master Black Belts are senior leaders in Lean Six Sigma initiatives. They develop strategies, provide guidance to Black Belts and Green Belts, and ensure the overall success of Lean Six Sigma within the organisation. Master Black Belts champion continuous improvement through the deployment of Lean Six Sigma across the organisation. They possess expert-level knowledge of Lean Six Sigma methodologies, advanced statistical analysis, and strategic planning. Their focus is on shaping organisational strategy, leading complex projects, and developing Lean Six Sigma programs. They are involved in providing leadership, coaching, and mentoring, as well as driving a continuous improvement culture across the organisation.

Lean Six Sigma Coach

Coaches, who are experienced Black Belts or Master Black Belts, provide technical support to practitioners. They guide Yellow, Green, or Black Belts, reviewing project progress, discussing the use of tools and techniques, and offering encouragement to maintain project focus. They have extensive experience and knowledge of Lean Six Sigma tools and methodologies. Coaches focus on facilitating learning through actual project experience and ensuring the proper application of Lean Six Sigma methodologies. They are involved in regularly meeting with improvement teams to provide guidance and review progress.

Types of Improvement Projects

Organisations undertake various types of Lean Six Sigma improvement projects, each varying in scope and complexity:

Small-Scale Projects (White Belt, Yellow Belt, Green Belt)

• Example: Reducing wait times in a specific department of a healthcare facility.

• Focus: Addressing localised issues that can be resolved relatively quickly.

• Outcomes: Improved efficiency, reduced cycle times, and enhanced customer satisfaction.

Medium-Scale Projects (Green Belt, Black Belt)

• Example: Streamlining the procurement process in a manufacturing company.

• Focus: Improving processes that affect multiple departments or functions.

• Outcomes: Cost savings, increased productivity, and better resource utilisation.

Large-Scale Projects (Black Belt, Master Black Belt)

• Example: Overhauling the entire supply chain management system of a retail organisation.

• Focus: Transforming critical business processes that have a substantial impact on the organisation’s overall performance.

• Outcomes: Significant cost reductions, improved customer service, and increased competitiveness.

Strategic Initiatives (Master Black Belt)

• Example: Implementing a company-wide Lean Six Sigma culture.

• Focus: Embedding Lean Six Sigma principles into the organisation’s strategic framework.

• Outcomes: Long-term, sustainable improvements, a culture of continuous improvement, and enhanced organisational agility.

Conclusion

Understanding the different levels of Lean Six Sigma belts and their respective responsibilities, knowledge, focus, and involvement is crucial for successfully implementing Lean Six Sigma in an organisation. Each belt level plays a unique role in driving process improvements, from localised problem-solving to strategic, organisation-wide transformations.

At Marí Consulting Group, we offer comprehensive training and support for all Lean Six Sigma belt levels to help your organisation achieve operational excellence. Contact us today to learn more about how we can assist you in your Lean Six Sigma journey and drive meaningful improvements across your organisation.