With the successful implementation of Lean methods, most people find it the most difficult to sustain all benefits gained after the improvement implementation process. If it is difficult to learn new things. It is even more difficult to get rid of old habits. Our training process involves a systematic performance audit, which starts at the beginning of the improvement implementation process. A coach regularly analyses whether the company successfully implements the system and whether it can manage to sustain all the benefits after the implementation process ends. Audit is not performed in organizations that implement only individual Lean tools.