Six Sigma is new, emerging, approach to quality assurance
and quality management with emphasis on continuous quality
improvements. The main goal of this approach is reaching level of
quality and reliability that will satisfy and even exceed demands
and expectations of today’s demanding customer [1].
A term Sigma Quality Level is used as an indicator of a process
goodness. Lower Sigma quality level means greater possibility of
defective products, while, higher Sigma quality level means smaller
possibility of defective products within process