Lean Six Sigma Institute

Institute for the Advancement and Application of Lean Six Sigma principles and tools for business process improvement and OpEx | Facilitator of World Class Lean Six Sigma Coaching and Training.


We provide Accredited Lean Six Sigma Certifications through our online proctored exams. We offer a wide variety of certification levels from Yellow Belt all the way to Master Black Belt level.


Our team of experienced Lean Six Sigma Black Belts and Master Black Belts can provide both onsite and remote coaching.


We provide onsite consulting services. We assist clients with specific problems they are facing and use the Lean Six Sigma methodology, principles, tools and techniques.

ILSSI Conference 2021 Cambridge Lean Six Sigma
  • ILSSI is on a mission be the most admired International Lean Six Sigma organisation for its people, partnerships and performance.
  • Facilitates and communicates best practices in the training and practical application of Lean Six Sigma principles, tools and techniques. Provides governance to ensure the integrity of examinations and certifications for Lean Six Sigma.
  • Conducts research and publishes case studies and white papers.
    Directors and Non-Executive Board Members from UK, Switzerland, Portugal, Saudi Arabia, Italy, USA, Nigeria, Egypt and Hong Kong.
    Collaboration with Heriot Watt University, Department of Quality Management.

Take a look at our numbers








& White papers

Take a look at our conferences

International Lean Six Sigma Institute Conferences

International Lean Six Sigma Institute Conference 2021 : Cambridge, UK

John Dennis PMP Master Black Belt ILSSI Lean Six Sigma UK Switzerland Zurich

The International Lean Six Sigma Institute (ILSSI) will host the 2021 International Lean Six Sigma Conference in Cambridge UK

October 2021, Granta Centre, Cambridge CB21 6GP


Most frequent questions and answers

Yes, all of our Lean Six Sigma exams and certifications are  Internationally Accredited and Certified by the ILSSI, based in the UK and international partners on every continent.

There are 4 levels of certifications,  Yellow Belt, Green Belt, Black Belt and Master Black Belt.  To obtain a Yellow, Green or Black Belt Lean Six Sigma certification, you must pass an exam ( e-mail us for more information or see ).  For the Master Black Belt you must also have proof of at least 5 years as a successful practicing Black Belt and have completed at least 3 DMAIC projects which can be audited by the International Lean Six Sigma Institute ( e-mail us for more information about the auditing process ).

Yes, ILSSI offers Lean Six Sigma exams in different languages.  We presently offer English, French and Italian with plans to offer Dutch, Spanish and Romanian by the end of 2020.

Get In touch

For further information about our services, or to speak to one of our Master Black Belt consultants about training, coaching or mentoring in Lean Six Sigma best practices, then please contact us to set up a meeting. 

Proud Partners of ILSSI

Our Services

UK Office

switzerland office

saudi arabia office

romania office

USA Office