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Evidence and practice for Lean Six Sigma coaches

For Black Belts, Master Black Belts and training providers who coach Belts through real projects. Every number with its source.

Evidence · 27 October 2026

Why Belt projects stall, and what the evidence says about coaching

Completion varies from 17% to over 80% between programmes. Projects stop most often in Measure and Analyze. MBB mentoring ranks among the top success factors. Interactive charts, every source graded.

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Practice

Nine lessons from 32 public Green Belt projects, and a 2-minute self-check

Tight scope, clean data, the right test, a sponsor, savings finance signs and a control plan built on roles and routines.

Read and check your project