The most natural place to start a discussion on the Six Sigma quality
             improvement process is the definition taken from the General Electrics
             website, company that, as we know, applied this process to the highest
             degree. As such, Six Sigma is NOT "a secret society, a slogan or a
             cliché", but "a highly disciplined process that helps us focus on
             developing and delivering near-perfect products and services"[1]. In an
             ever growing and more dynamic business environment as the companies are
             competing in today, the customer plays a center role. As a company, you
             sell products or services. Making sure that you have a targeted market or
             a potential one, a defined set of customers to whom you can sell these
             products is a must. However, because of a dynamic business environment,
             this must is often not enough. You must make sure not only that you can
             retain the present customer base, but also that you can gain new customers
             in time and expand your business. In this plot, the customer, as I said,
             plays a center role. This is because the growing competition allows him to
             move along to another company if he is not satisfied with the services
             offered by your own. Running along our train of thought, this means that
             the products and services you offer must be of the best quality. These are
             the two poles of the Six Sigma: customer satisfaction and product quality.
             Thus, the Six Sigma process is highly effective in a company "focused
             on customer satisfaction"[2] by offering a method and tools "for
             identification and improvement of both internal and external process
             problems to better meet customers' needs by identifying the variations in
             your organization's processes that might influence the customer's point of
             view negatively"[3]. The concept starts from the normal distribution
             theorem and the Gauss equation. The graphic for this function is referred
             to as the Gauss bell ...