Six Sigma processes and techniques can be used for both improving existing business processes and for developing new processes or products at Six Sigma quality levels. are particularly wellsuited for boosting innovation and creativity in developing altogether new products or production technologies. are based on three principles: $(1)$ all work is a statistically controllable process; $(2)$ no well$-$controlled process allows variability and $(3)$ defect$-$free work requires tight statistical controls. can be used for rapidly achieving quantum gains of $30$ to $50$ percent in the accuracy with which a particular task or business process is performed. entail using a disciplined, statistics$-$based system to control the quality or accuracy of manufacturing or assembly activities such that there are no more than $15$ defects per million iterations