What is the ILSSI?

The International Lean Six Sigma Institute (ILSSI) is a globally recognized organization dedicated to advancing Lean Six Sigma methodologies. Headquartered in the UK, ILSSI supports professionals and organizations in implementing process improvement strategies across a wide range of industries. Their certification programs emphasize practical knowledge, real-world application, and international standards.

To learn more about ILSSI’s mission, certifications, and global initiatives, visit the official ILSSI website.

ILSSI’s Approach to Yellow Belt Certification

ILSSI Yellow Belt certification is designed for professionals who are new to Lean Six Sigma and want to gain a foundational understanding of process improvement. Yellow Belts typically support larger projects or lead smaller-scale initiatives within their departments. The ILSSI Yellow Belt certification equips candidates with tools and knowledge to identify opportunities for waste reduction, support data-driven decision making, and improve team-based performance.

Key Features of ILSSI Yellow Belt Certification:

  • Globally accepted certification standards
  • Emphasis on Lean and Six Sigma fundamentals
  • Recognition of real-world examples and applications
  • Online and in-person training options available

For more on the certification process and exam details, refer to ILSSI’s Yellow Belt Certification.

ILSSI Yellow Belt Body of Knowledge (BOK)

Below is the complete list of topics that form the ILSSI Yellow Belt Body of Knowledge.

  1. Fundamentals of Process Improvement
  2. General History of Lean Six Sigma
  3. Principles of Lean and Six Sigma
  4. Voice of the Customer, and Business
  5. Lean Six Sigma Belt Roles
  6. Defining a Process
  7. Inputs and Outputs
  8. The 8 Elements of Waste
  9. Sustainable Processes
  10. 5S
  11. Critical to Quality (CTQs)
  12. SIPOC
  13. Process Mapping
  14. Value Stream Mapping
  15. Flow and Bottle-necks
  16. Single-Piece-Flow
  17. Poka-Yoke (Mistake Proofing)
  18. SMED (Quick Change Over)
  19. PULL and Just-in-Time
  20. Kanban
  21. Visual Management
  22. Standardised Work
  23. Kaizen and Kaizen Events
  24. PDCA
  25. Root Cause Analysis
  26. Cause & Effect / Fishbone Diagrams
  27. Pareto Principle / Pareto Charts
  28. Industry 4.0 (Introduction)
  29. Lean Six Sigma Projects
  30. DMAIC basics

Conclusion

The ILSSI Yellow Belt BOK provides a structured and comprehensive path for professionals to begin their Lean Six Sigma journey. With a focus on practical tools, process understanding, and waste elimination, it sets the stage for deeper certification levels and career advancement in continuous improvement roles. Use this guide and the linked resources to confidently prepare for your ILSSI Yellow Belt certification.