Using the Six Sigma Methodology, Teksid succeeded over the years, to improve the quality of process outputs by identifying and removing the causes of defects (errors) and minimizing variability in the manufacturing processes, resulting in excellent quality of its products.
The Six Sigma Methodology uses a set of quality management tools, including statistical methods, and creates a special infrastructure of people within the organization ("Black Belts", "Green Belts", etc.) who are experts in these methods.
The focus is to reduce the standard deviation which, in turn, is a measure of variability of a data set. If the variability is small, the standard deviation is low. If the variability is large, the standard deviation is high. For a process to achieve excellence, their variability should be low. This assessment is made by sigma value, a mathematical symbol for dispersion.