Essay --

1) What is Six Sigma (6S) ? 1.1 The concept The sigma’s concept comes from the Greek letter ‘ÏÆ'’ which the statisticians use to describe the â€Å"the standard deviation of a population†. So, Sigma represents the variability within a population. A high quality level of Sigma demonstrates the possibility of defective products. The higher the Sigma’s level, the lower the rate of the defective. Hence, the use of Six Sigma helps to reduce the variation, achieving small standard deviations and improving the product’s quality.(Pande et al 2002, Breyfogle 1999, Breyfogle et al 2001, Oakland 1999) 1.2 The background Six Sigma was developed by Motorola in the late 1980s with a view to improving the quality (Bhote 2002). In 1990s, General Electric and Allied Signal implied Six Sigma successfully. After that, more and more organisations firstly in United States and after worldwide developed 6S and it won the attention of the business world. The strategy of Six Sigma includes the use of statistical tools within a structured methodology for obtaining of knowledge needed to achieve faster, better and cheaper products and services from the competitors. The disciplined and the repeated implementation of the main strategy are the key of the 6S. (Breyfogle 1999, Urdhwareshe 2000) 1.3 Definition of Six Sigma Six sigma has many definitions depending on the authors, it can be defined as a strategy, an operational initiative, a statistic method, a tool for measurement, a target, a comparative performance’s measure, a vision, a philosophy and other. Breyfogle (1999) supports that Six Sigma is considered an operational strategy that uses a well-structured continuous improvement methodology. The aim is to reduce the variability of processes and the c... ...Six Sigma is not a technique or a method, according to the definition of Mario Perez-Wilson (1999), the 6S targets an optimized performance level with almost zero defects in a process that produces products, services or transactions. It indicates an achievement and maintenance of a world-class performance. Six Sigma is the result, not the journey. Accordingly, Perez-Wilson does not consider the Six Sigma as a methodology, but as a target. Consequently, according Knowles (2011), as output of the different views, Six Sigma has three aspects and it is: 1) A measure: How far is the organisation from the target and the perfect quality ? 2) A target: 3.4 defects per one million opportunities. 3) A philosophy: It focuses on sustainability and on a long term strategy which targets on the reduction of expenses, decreasing the variability in the process and the products.