The Vital Difference Between Lean Six-Sigma and "The Way" by Kashmir Birk
Lean Six-Sigma, TQM and Process Improvement will create efficiencies and reduce cycle time, of that there is no doubt.
But these improvement programs are not sustainable, if they are temporary surges in cost reduction and in the absence of a whole systems perspective create downstream costs and hidden costs due to regrettable losses of mission-critical talent and employee engagement issues for those who are not involved directly in the improvement teams.
The change needs to pull together the whole system or it will be a short term illusion.