Design/methodology/approach – The paper provides a general review of the Six-Sigma and some of its extensions. The topic is followed by the
introduction of a new algorithm that can be used for calculating the overall sigma level of a multistage system.
Findings – In a journey to business excellence, an organization is successful if specific goals for critical processes of the organization are identified.
The quality management programs implemented can modernize and simplify activities towards the ultimate goal of the business. Regarding that, the
author discusses key issues as such as leadership commitment, what Six-Sigma would bring to the organization, how it works, Six-Sigma business
strategies, Six-Sigma methodologies, mathematical formulation of Six-Sigma, the use of simulation with Six-Sigma, new Six-Sigma, benefits of
Six-Sigma, costs of Six-Sigma, critical success factors and the future of Six-Sigma.