The Global Lean Six Sigma Registry (GLSSR) was started in 2004 with the mission to satisfy a pervasive industry need for an archive of Lean Six Sigma practitioners and to validate that certificate holders held a level of understanding that was commensurate with the level of Belt certification they were claiming. The GLSSR has more 675,000 members and is the largest Lean Six Sigma Certification Registry in the world.

Significant Books