Certified Lean Six Sigma Yellow Belt is an individual who has attained a basic knowledge of Six Sigma, but does not lead projects on their own. They are often responsible for the development of process maps to support Six Sigma projects. A Yellow Belt participates as a core team member or subject matter expert (SME) on a project or projects. In addition, Yellow Belts may often be responsible for running smaller process improvement projects using the PDCA (Plan, Do, Check, Act) methodology.

Certified Lean Six Sigma Green Belt is an individual that possesses a thorough understanding of enhanced problem-solving skills, with an emphasis on the DMAIC (Define, Measure, Analyze, Improve and Control) model. The Green Belt Certification designation also reflects the knowledge by the individual to serve as a trained team member within his or her function-specific area of the organization. This focus allows the Green Belt to work on small, carefully defined Six Sigma projects

Certified Lean Six Sigma Black Belt is an individual that possesses a thorough understanding of the entire Six Sigma Body of Knowledge. In addition, this individual has a thorough comprehension of both Six Sigma philosophies and principles (including supporting systems and tools). The Black Belt Certification designation also reflects an understanding of team leadership, team dynamics, and the ability to successfully assign team members with roles and responsibilities.