Shri Manian has brought to fore , an extremely important aspect of any Improvement project , in an manufacturing set-up, i.e. CHANGE MANAGEMENT. Any six sigma project is a doubtful contender on the scale of sustainability of the improvements, without proper Change management !! As pointed by him, Complacency, Resistance to Change, Traditional Mindsets, " Whats-wrong-with-what-was-happening-till-now" kind of mentality, will always try to de-rail the gains, unless a proper change management is carried out considering the potential failure modes. At the same time , a Good Change management execution, will convert a seemingly minor improvement in a process, into a mani-fold benefit grosser of a project. Regarding DPMO levels, my experience tells, that Percentage shift from the baseline, for a sustained period, is far more encouraging to the shop floor process owner than the numbers. The Proof of a good pooding is in its taste, afterall!!